mirror of
https://github.com/LawnchairLauncher/lawnchair.git
synced 2026-02-19 10:48:19 +00:00
96d30a1651
-> This will be used for appending custom content to the left of the workspace -> Stripped out a bunch of dead code related to notion of layout scale in PagedView Change-Id: If4dbe28431cb5fb60dc170f6ee6e55a649dac45e
2853 lines
112 KiB
Java
2853 lines
112 KiB
Java
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.launcher3;
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import android.animation.Animator;
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import android.animation.AnimatorListenerAdapter;
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import android.animation.AnimatorSet;
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import android.animation.ObjectAnimator;
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import android.animation.TimeInterpolator;
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import android.animation.ValueAnimator;
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import android.animation.ValueAnimator.AnimatorUpdateListener;
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import android.content.Context;
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import android.content.res.Resources;
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import android.content.res.TypedArray;
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import android.graphics.Canvas;
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import android.graphics.Matrix;
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import android.graphics.PointF;
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import android.graphics.Rect;
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import android.os.Bundle;
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import android.os.Parcel;
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import android.os.Parcelable;
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import android.util.AttributeSet;
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import android.util.DisplayMetrics;
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import android.util.Log;
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import android.view.InputDevice;
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import android.view.KeyEvent;
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import android.view.MotionEvent;
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import android.view.VelocityTracker;
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import android.view.View;
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import android.view.ViewConfiguration;
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import android.view.ViewGroup;
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import android.view.ViewParent;
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import android.view.ViewGroup.LayoutParams;
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import android.view.accessibility.AccessibilityEvent;
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import android.view.accessibility.AccessibilityManager;
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import android.view.accessibility.AccessibilityNodeInfo;
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import android.view.animation.AnimationUtils;
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import android.view.animation.DecelerateInterpolator;
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import android.view.animation.Interpolator;
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import android.view.animation.LinearInterpolator;
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import android.widget.FrameLayout;
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import android.widget.Scroller;
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import java.util.ArrayList;
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/**
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* An abstraction of the original Workspace which supports browsing through a
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* sequential list of "pages"
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*/
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public abstract class PagedView extends ViewGroup implements ViewGroup.OnHierarchyChangeListener {
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private static final String TAG = "PagedView";
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private static final boolean DEBUG = false;
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protected static final int INVALID_PAGE = -1;
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// the min drag distance for a fling to register, to prevent random page shifts
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private static final int MIN_LENGTH_FOR_FLING = 25;
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protected static final int PAGE_SNAP_ANIMATION_DURATION = 750;
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protected static final int SLOW_PAGE_SNAP_ANIMATION_DURATION = 950;
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protected static final float NANOTIME_DIV = 1000000000.0f;
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private static final float OVERSCROLL_ACCELERATE_FACTOR = 2;
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private static final float OVERSCROLL_DAMP_FACTOR = 0.14f;
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private static final float RETURN_TO_ORIGINAL_PAGE_THRESHOLD = 0.33f;
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// The page is moved more than halfway, automatically move to the next page on touch up.
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private static final float SIGNIFICANT_MOVE_THRESHOLD = 0.4f;
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// The following constants need to be scaled based on density. The scaled versions will be
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// assigned to the corresponding member variables below.
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private static final int FLING_THRESHOLD_VELOCITY = 500;
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private static final int MIN_SNAP_VELOCITY = 1500;
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private static final int MIN_FLING_VELOCITY = 250;
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// We are disabling touch interaction of the widget region for factory ROM.
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private static final boolean DISABLE_TOUCH_INTERACTION = false;
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private static final boolean DISABLE_TOUCH_SIDE_PAGES = false;
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private static final boolean DISABLE_FLING_TO_DELETE = true;
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static final int AUTOMATIC_PAGE_SPACING = -1;
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protected int mFlingThresholdVelocity;
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protected int mMinFlingVelocity;
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protected int mMinSnapVelocity;
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protected float mDensity;
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protected float mSmoothingTime;
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protected float mTouchX;
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protected boolean mFirstLayout = true;
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protected int mCurrentPage;
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protected int mChildCountOnLastMeasure;
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protected int mNextPage = INVALID_PAGE;
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protected int mMaxScrollX;
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protected Scroller mScroller;
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private VelocityTracker mVelocityTracker;
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private float mParentDownMotionX;
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private float mParentDownMotionY;
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private float mDownMotionX;
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private float mDownMotionY;
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private float mDownScrollX;
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protected float mLastMotionX;
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protected float mLastMotionXRemainder;
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protected float mLastMotionY;
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protected float mTotalMotionX;
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private int mLastScreenCenter = -1;
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private int[] mChildOffsets;
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private int[] mChildRelativeOffsets;
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protected final static int TOUCH_STATE_REST = 0;
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protected final static int TOUCH_STATE_SCROLLING = 1;
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protected final static int TOUCH_STATE_PREV_PAGE = 2;
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protected final static int TOUCH_STATE_NEXT_PAGE = 3;
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protected final static int TOUCH_STATE_REORDERING = 4;
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protected final static float ALPHA_QUANTIZE_LEVEL = 0.0001f;
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protected int mTouchState = TOUCH_STATE_REST;
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protected boolean mForceScreenScrolled = false;
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protected OnLongClickListener mLongClickListener;
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protected int mTouchSlop;
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private int mPagingTouchSlop;
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private int mMaximumVelocity;
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protected int mPageSpacing;
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protected int mPageLayoutPaddingTop;
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protected int mPageLayoutPaddingBottom;
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protected int mPageLayoutPaddingLeft;
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protected int mPageLayoutPaddingRight;
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protected int mPageLayoutWidthGap;
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protected int mPageLayoutHeightGap;
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protected int mCellCountX = 0;
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protected int mCellCountY = 0;
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protected boolean mCenterPagesVertically;
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protected boolean mAllowOverScroll = true;
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protected int mUnboundedScrollX;
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protected int[] mTempVisiblePagesRange = new int[2];
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protected boolean mForceDrawAllChildrenNextFrame;
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// mOverScrollX is equal to getScrollX() when we're within the normal scroll range. Otherwise
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// it is equal to the scaled overscroll position. We use a separate value so as to prevent
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// the screens from continuing to translate beyond the normal bounds.
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protected int mOverScrollX;
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protected static final int INVALID_POINTER = -1;
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protected int mActivePointerId = INVALID_POINTER;
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private PageSwitchListener mPageSwitchListener;
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protected ArrayList<Boolean> mDirtyPageContent;
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// If true, syncPages and syncPageItems will be called to refresh pages
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protected boolean mContentIsRefreshable = true;
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// If true, modify alpha of neighboring pages as user scrolls left/right
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protected boolean mFadeInAdjacentScreens = false;
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// It true, use a different slop parameter (pagingTouchSlop = 2 * touchSlop) for deciding
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// to switch to a new page
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protected boolean mUsePagingTouchSlop = true;
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// If true, the subclass should directly update scrollX itself in its computeScroll method
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// (SmoothPagedView does this)
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protected boolean mDeferScrollUpdate = false;
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protected boolean mIsPageMoving = false;
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// All syncs and layout passes are deferred until data is ready.
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protected boolean mIsDataReady = false;
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protected boolean mAllowLongPress = true;
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// Scrolling indicator
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private ValueAnimator mScrollIndicatorAnimator;
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private View mScrollIndicator;
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private int mScrollIndicatorPaddingLeft;
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private int mScrollIndicatorPaddingRight;
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private boolean mHasScrollIndicator = true;
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private boolean mShouldShowScrollIndicator = false;
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private boolean mShouldShowScrollIndicatorImmediately = false;
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protected static final int sScrollIndicatorFadeInDuration = 150;
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protected static final int sScrollIndicatorFadeOutDuration = 650;
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protected static final int sScrollIndicatorFlashDuration = 650;
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private boolean mScrollingPaused = false;
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// The viewport whether the pages are to be contained (the actual view may be larger than the
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// viewport)
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private Rect mViewport = new Rect();
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// Reordering
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// We use the min scale to determine how much to expand the actually PagedView measured
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// dimensions such that when we are zoomed out, the view is not clipped
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private int REORDERING_DROP_REPOSITION_DURATION = 200;
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protected int REORDERING_REORDER_REPOSITION_DURATION = 300;
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protected int REORDERING_ZOOM_IN_OUT_DURATION = 250;
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private int REORDERING_SIDE_PAGE_HOVER_TIMEOUT = 300;
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private float REORDERING_SIDE_PAGE_BUFFER_PERCENTAGE = 0.1f;
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private long REORDERING_DELETE_DROP_TARGET_FADE_DURATION = 150;
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private float mMinScale = 1f;
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protected View mDragView;
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protected AnimatorSet mZoomInOutAnim;
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private Runnable mSidePageHoverRunnable;
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private int mSidePageHoverIndex = -1;
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// This variable's scope is only for the duration of startReordering() and endReordering()
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private boolean mReorderingStarted = false;
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// This variable's scope is for the duration of startReordering() and after the zoomIn()
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// animation after endReordering()
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private boolean mIsReordering;
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// The runnable that settles the page after snapToPage and animateDragViewToOriginalPosition
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private int NUM_ANIMATIONS_RUNNING_BEFORE_ZOOM_OUT = 2;
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private int mPostReorderingPreZoomInRemainingAnimationCount;
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private Runnable mPostReorderingPreZoomInRunnable;
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// Edge swiping
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private boolean mOnlyAllowEdgeSwipes = false;
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private boolean mDownEventOnEdge = false;
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private int mEdgeSwipeRegionSize = 0;
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// Convenience/caching
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private Matrix mTmpInvMatrix = new Matrix();
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private float[] mTmpPoint = new float[2];
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private Rect mTmpRect = new Rect();
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private Rect mAltTmpRect = new Rect();
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// Fling to delete
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private int FLING_TO_DELETE_FADE_OUT_DURATION = 350;
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private float FLING_TO_DELETE_FRICTION = 0.035f;
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// The degrees specifies how much deviation from the up vector to still consider a fling "up"
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private float FLING_TO_DELETE_MAX_FLING_DEGREES = 65f;
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protected int mFlingToDeleteThresholdVelocity = -1400;
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// Drag to delete
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private boolean mDeferringForDelete = false;
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private int DELETE_SLIDE_IN_SIDE_PAGE_DURATION = 250;
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private int DRAG_TO_DELETE_FADE_OUT_DURATION = 350;
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// Drop to delete
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private View mDeleteDropTarget;
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private boolean mAutoComputePageSpacing = false;
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private boolean mRecomputePageSpacing = false;
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// Bouncer
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private boolean mTopAlignPageWhenShrinkingForBouncer = false;
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public interface PageSwitchListener {
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void onPageSwitch(View newPage, int newPageIndex);
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}
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public PagedView(Context context) {
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this(context, null);
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}
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public PagedView(Context context, AttributeSet attrs) {
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this(context, attrs, 0);
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}
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public PagedView(Context context, AttributeSet attrs, int defStyle) {
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super(context, attrs, defStyle);
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TypedArray a = context.obtainStyledAttributes(attrs,
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R.styleable.PagedView, defStyle, 0);
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setPageSpacing(a.getDimensionPixelSize(R.styleable.PagedView_pageSpacing, 0));
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if (mPageSpacing < 0) {
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mAutoComputePageSpacing = mRecomputePageSpacing = true;
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}
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mPageLayoutPaddingTop = a.getDimensionPixelSize(
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R.styleable.PagedView_pageLayoutPaddingTop, 0);
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mPageLayoutPaddingBottom = a.getDimensionPixelSize(
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R.styleable.PagedView_pageLayoutPaddingBottom, 0);
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mPageLayoutPaddingLeft = a.getDimensionPixelSize(
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R.styleable.PagedView_pageLayoutPaddingLeft, 0);
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mPageLayoutPaddingRight = a.getDimensionPixelSize(
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R.styleable.PagedView_pageLayoutPaddingRight, 0);
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mPageLayoutWidthGap = a.getDimensionPixelSize(
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R.styleable.PagedView_pageLayoutWidthGap, 0);
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mPageLayoutHeightGap = a.getDimensionPixelSize(
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R.styleable.PagedView_pageLayoutHeightGap, 0);
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mScrollIndicatorPaddingLeft =
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a.getDimensionPixelSize(R.styleable.PagedView_scrollIndicatorPaddingLeft, 0);
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mScrollIndicatorPaddingRight =
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a.getDimensionPixelSize(R.styleable.PagedView_scrollIndicatorPaddingRight, 0);
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a.recycle();
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setHapticFeedbackEnabled(false);
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init();
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}
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/**
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* Initializes various states for this workspace.
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*/
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protected void init() {
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mDirtyPageContent = new ArrayList<Boolean>();
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mDirtyPageContent.ensureCapacity(32);
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mScroller = new Scroller(getContext(), new ScrollInterpolator());
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mCurrentPage = 0;
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mCenterPagesVertically = true;
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final ViewConfiguration configuration = ViewConfiguration.get(getContext());
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mTouchSlop = configuration.getScaledPagingTouchSlop();
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mPagingTouchSlop = configuration.getScaledPagingTouchSlop();
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mMaximumVelocity = configuration.getScaledMaximumFlingVelocity();
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mDensity = getResources().getDisplayMetrics().density;
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// Scale the fling-to-delete threshold by the density
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mFlingToDeleteThresholdVelocity =
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(int) (mFlingToDeleteThresholdVelocity * mDensity);
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mFlingThresholdVelocity = (int) (FLING_THRESHOLD_VELOCITY * mDensity);
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mMinFlingVelocity = (int) (MIN_FLING_VELOCITY * mDensity);
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mMinSnapVelocity = (int) (MIN_SNAP_VELOCITY * mDensity);
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setOnHierarchyChangeListener(this);
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}
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void setDeleteDropTarget(View v) {
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mDeleteDropTarget = v;
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}
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// Convenience methods to map points from self to parent and vice versa
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float[] mapPointFromViewToParent(View v, float x, float y) {
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mTmpPoint[0] = x;
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mTmpPoint[1] = y;
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v.getMatrix().mapPoints(mTmpPoint);
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mTmpPoint[0] += v.getLeft();
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mTmpPoint[1] += v.getTop();
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return mTmpPoint;
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}
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float[] mapPointFromParentToView(View v, float x, float y) {
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mTmpPoint[0] = x - v.getLeft();
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mTmpPoint[1] = y - v.getTop();
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v.getMatrix().invert(mTmpInvMatrix);
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mTmpInvMatrix.mapPoints(mTmpPoint);
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return mTmpPoint;
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}
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void updateDragViewTranslationDuringDrag() {
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float x = mLastMotionX - mDownMotionX + getScrollX() - mDownScrollX;
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float y = mLastMotionY - mDownMotionY;
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mDragView.setTranslationX(x);
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mDragView.setTranslationY(y);
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if (DEBUG) Log.d(TAG, "PagedView.updateDragViewTranslationDuringDrag(): " + x + ", " + y);
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}
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public void setMinScale(float f) {
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mMinScale = f;
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requestLayout();
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}
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@Override
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public void setScaleX(float scaleX) {
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super.setScaleX(scaleX);
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if (isReordering(true)) {
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float[] p = mapPointFromParentToView(this, mParentDownMotionX, mParentDownMotionY);
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mLastMotionX = p[0];
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mLastMotionY = p[1];
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updateDragViewTranslationDuringDrag();
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}
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}
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// Convenience methods to get the actual width/height of the PagedView (since it is measured
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// to be larger to account for the minimum possible scale)
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int getViewportWidth() {
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return mViewport.width();
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}
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int getViewportHeight() {
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return mViewport.height();
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}
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// Convenience methods to get the offset ASSUMING that we are centering the pages in the
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// PagedView both horizontally and vertically
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int getViewportOffsetX() {
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return (getMeasuredWidth() - getViewportWidth()) / 2;
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}
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int getViewportOffsetY() {
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return (getMeasuredHeight() - getViewportHeight()) / 2;
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}
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public void setPageSwitchListener(PageSwitchListener pageSwitchListener) {
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mPageSwitchListener = pageSwitchListener;
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if (mPageSwitchListener != null) {
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mPageSwitchListener.onPageSwitch(getPageAt(mCurrentPage), mCurrentPage);
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}
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}
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/**
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* Note: this is a reimplementation of View.isLayoutRtl() since that is currently hidden api.
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*/
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public boolean isLayoutRtl() {
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return (getLayoutDirection() == LAYOUT_DIRECTION_RTL);
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}
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/**
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* Called by subclasses to mark that data is ready, and that we can begin loading and laying
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* out pages.
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*/
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protected void setDataIsReady() {
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mIsDataReady = true;
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}
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protected boolean isDataReady() {
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return mIsDataReady;
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}
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/**
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* Returns the index of the currently displayed page.
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*
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* @return The index of the currently displayed page.
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*/
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int getCurrentPage() {
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return mCurrentPage;
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}
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int getNextPage() {
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return (mNextPage != INVALID_PAGE) ? mNextPage : mCurrentPage;
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}
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int getPageCount() {
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return getChildCount();
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}
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View getPageAt(int index) {
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return getChildAt(index);
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}
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protected int indexToPage(int index) {
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return index;
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}
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/**
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* Updates the scroll of the current page immediately to its final scroll position. We use this
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* in CustomizePagedView to allow tabs to share the same PagedView while resetting the scroll of
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* the previous tab page.
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*/
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protected void updateCurrentPageScroll() {
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// If the current page is invalid, just reset the scroll position to zero
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int newX = 0;
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if (0 <= mCurrentPage && mCurrentPage < getPageCount()) {
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int offset = getChildOffset(mCurrentPage);
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int relOffset = getRelativeChildOffset(mCurrentPage);
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newX = offset - relOffset;
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}
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scrollTo(newX, 0);
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mScroller.setFinalX(newX);
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mScroller.forceFinished(true);
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}
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/**
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* Called during AllApps/Home transitions to avoid unnecessary work. When that other animation
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* ends, {@link #resumeScrolling()} should be called, along with
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* {@link #updateCurrentPageScroll()} to correctly set the final state and re-enable scrolling.
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*/
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void pauseScrolling() {
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mScroller.forceFinished(true);
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cancelScrollingIndicatorAnimations();
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mScrollingPaused = true;
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}
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/**
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* Enables scrolling again.
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* @see #pauseScrolling()
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*/
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void resumeScrolling() {
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mScrollingPaused = false;
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}
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/**
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* Sets the current page.
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*/
|
|
void setCurrentPage(int currentPage) {
|
|
if (!mScroller.isFinished()) {
|
|
mScroller.abortAnimation();
|
|
}
|
|
// don't introduce any checks like mCurrentPage == currentPage here-- if we change the
|
|
// the default
|
|
if (getChildCount() == 0) {
|
|
return;
|
|
}
|
|
|
|
mForceScreenScrolled = true;
|
|
mCurrentPage = Math.max(0, Math.min(currentPage, getPageCount() - 1));
|
|
updateCurrentPageScroll();
|
|
updateScrollingIndicator();
|
|
notifyPageSwitchListener();
|
|
invalidate();
|
|
}
|
|
|
|
protected void notifyPageSwitchListener() {
|
|
if (mPageSwitchListener != null) {
|
|
mPageSwitchListener.onPageSwitch(getPageAt(mCurrentPage), mCurrentPage);
|
|
}
|
|
}
|
|
protected void pageBeginMoving() {
|
|
if (!mIsPageMoving) {
|
|
mIsPageMoving = true;
|
|
onPageBeginMoving();
|
|
}
|
|
}
|
|
|
|
protected void pageEndMoving() {
|
|
if (mIsPageMoving) {
|
|
mIsPageMoving = false;
|
|
onPageEndMoving();
|
|
}
|
|
}
|
|
|
|
protected boolean isPageMoving() {
|
|
return mIsPageMoving;
|
|
}
|
|
|
|
// a method that subclasses can override to add behavior
|
|
protected void onPageBeginMoving() {
|
|
}
|
|
|
|
// a method that subclasses can override to add behavior
|
|
protected void onPageEndMoving() {
|
|
}
|
|
|
|
/**
|
|
* Registers the specified listener on each page contained in this workspace.
|
|
*
|
|
* @param l The listener used to respond to long clicks.
|
|
*/
|
|
@Override
|
|
public void setOnLongClickListener(OnLongClickListener l) {
|
|
mLongClickListener = l;
|
|
final int count = getPageCount();
|
|
for (int i = 0; i < count; i++) {
|
|
getPageAt(i).setOnLongClickListener(l);
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public void scrollBy(int x, int y) {
|
|
scrollTo(mUnboundedScrollX + x, getScrollY() + y);
|
|
}
|
|
|
|
@Override
|
|
public void scrollTo(int x, int y) {
|
|
final boolean isRtl = isLayoutRtl();
|
|
mUnboundedScrollX = x;
|
|
|
|
boolean isXBeforeFirstPage = isRtl ? (x > mMaxScrollX) : (x < 0);
|
|
boolean isXAfterLastPage = isRtl ? (x < 0) : (x > mMaxScrollX);
|
|
if (isXBeforeFirstPage) {
|
|
super.scrollTo(0, y);
|
|
if (mAllowOverScroll) {
|
|
if (isRtl) {
|
|
overScroll(x - mMaxScrollX);
|
|
} else {
|
|
overScroll(x);
|
|
}
|
|
}
|
|
} else if (isXAfterLastPage) {
|
|
super.scrollTo(mMaxScrollX, y);
|
|
if (mAllowOverScroll) {
|
|
if (isRtl) {
|
|
overScroll(x);
|
|
} else {
|
|
overScroll(x - mMaxScrollX);
|
|
}
|
|
}
|
|
} else {
|
|
mOverScrollX = x;
|
|
super.scrollTo(x, y);
|
|
}
|
|
|
|
mTouchX = x;
|
|
mSmoothingTime = System.nanoTime() / NANOTIME_DIV;
|
|
|
|
// Update the last motion events when scrolling
|
|
if (isReordering(true)) {
|
|
float[] p = mapPointFromParentToView(this, mParentDownMotionX, mParentDownMotionY);
|
|
mLastMotionX = p[0];
|
|
mLastMotionY = p[1];
|
|
updateDragViewTranslationDuringDrag();
|
|
}
|
|
}
|
|
|
|
// we moved this functionality to a helper function so SmoothPagedView can reuse it
|
|
protected boolean computeScrollHelper() {
|
|
if (mScroller.computeScrollOffset()) {
|
|
// Don't bother scrolling if the page does not need to be moved
|
|
if (getScrollX() != mScroller.getCurrX()
|
|
|| getScrollY() != mScroller.getCurrY()
|
|
|| mOverScrollX != mScroller.getCurrX()) {
|
|
scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
|
|
}
|
|
invalidate();
|
|
return true;
|
|
} else if (mNextPage != INVALID_PAGE) {
|
|
mCurrentPage = Math.max(0, Math.min(mNextPage, getPageCount() - 1));
|
|
mNextPage = INVALID_PAGE;
|
|
notifyPageSwitchListener();
|
|
|
|
// We don't want to trigger a page end moving unless the page has settled
|
|
// and the user has stopped scrolling
|
|
if (mTouchState == TOUCH_STATE_REST) {
|
|
pageEndMoving();
|
|
}
|
|
|
|
onPostReorderingAnimationCompleted();
|
|
// Notify the user when the page changes
|
|
AccessibilityManager accessibilityManager = (AccessibilityManager)
|
|
getContext().getSystemService(Context.ACCESSIBILITY_SERVICE);
|
|
if (accessibilityManager.isEnabled()) {
|
|
AccessibilityEvent ev =
|
|
AccessibilityEvent.obtain(AccessibilityEvent.TYPE_VIEW_SCROLLED);
|
|
ev.getText().add(getCurrentPageDescription());
|
|
sendAccessibilityEventUnchecked(ev);
|
|
}
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
@Override
|
|
public void computeScroll() {
|
|
computeScrollHelper();
|
|
}
|
|
|
|
protected boolean shouldSetTopAlignedPivotForWidget(int childIndex) {
|
|
return mTopAlignPageWhenShrinkingForBouncer;
|
|
}
|
|
|
|
public static class LayoutParams extends ViewGroup.LayoutParams {
|
|
public boolean isFullScreenPage = false;
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*/
|
|
public LayoutParams(int width, int height) {
|
|
super(width, height);
|
|
}
|
|
|
|
public LayoutParams(ViewGroup.LayoutParams source) {
|
|
super(source);
|
|
}
|
|
}
|
|
|
|
protected LayoutParams generateDefaultLayoutParams() {
|
|
return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
|
|
}
|
|
|
|
public void addFullScreenPage(View page, int width, int height) {
|
|
LayoutParams lp = generateDefaultLayoutParams();
|
|
lp.isFullScreenPage = true;
|
|
super.addView(page, 0, lp);
|
|
}
|
|
|
|
@Override
|
|
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
|
|
if (!mIsDataReady || getChildCount() == 0) {
|
|
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
|
|
return;
|
|
}
|
|
|
|
// We measure the dimensions of the PagedView to be larger than the pages so that when we
|
|
// zoom out (and scale down), the view is still contained in the parent
|
|
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
|
|
int widthSize = MeasureSpec.getSize(widthMeasureSpec);
|
|
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
|
|
int heightSize = MeasureSpec.getSize(heightMeasureSpec);
|
|
// NOTE: We multiply by 1.5f to account for the fact that depending on the offset of the
|
|
// viewport, we can be at most one and a half screens offset once we scale down
|
|
DisplayMetrics dm = getResources().getDisplayMetrics();
|
|
int maxSize = Math.max(dm.widthPixels, dm.heightPixels);
|
|
int parentWidthSize = (int) (1.5f * maxSize);
|
|
int parentHeightSize = maxSize;
|
|
int scaledWidthSize = (int) (parentWidthSize / mMinScale);
|
|
int scaledHeightSize = (int) (parentHeightSize / mMinScale);
|
|
mViewport.set(0, 0, widthSize, heightSize);
|
|
|
|
if (widthMode == MeasureSpec.UNSPECIFIED || heightMode == MeasureSpec.UNSPECIFIED) {
|
|
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
|
|
return;
|
|
}
|
|
|
|
// Return early if we aren't given a proper dimension
|
|
if (widthSize <= 0 || heightSize <= 0) {
|
|
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
|
|
return;
|
|
}
|
|
|
|
/* Allow the height to be set as WRAP_CONTENT. This allows the particular case
|
|
* of the All apps view on XLarge displays to not take up more space then it needs. Width
|
|
* is still not allowed to be set as WRAP_CONTENT since many parts of the code expect
|
|
* each page to have the same width.
|
|
*/
|
|
final int verticalPadding = getPaddingTop() + getPaddingBottom();
|
|
final int horizontalPadding = getPaddingLeft() + getPaddingRight();
|
|
|
|
// The children are given the same width and height as the workspace
|
|
// unless they were set to WRAP_CONTENT
|
|
if (DEBUG) Log.d(TAG, "PagedView.onMeasure(): " + widthSize + ", " + heightSize);
|
|
if (DEBUG) Log.d(TAG, "PagedView.scaledSize: " + scaledWidthSize + ", " + scaledHeightSize);
|
|
if (DEBUG) Log.d(TAG, "PagedView.parentSize: " + parentWidthSize + ", " + parentHeightSize);
|
|
if (DEBUG) Log.d(TAG, "PagedView.horizontalPadding: " + horizontalPadding);
|
|
if (DEBUG) Log.d(TAG, "PagedView.verticalPadding: " + verticalPadding);
|
|
final int childCount = getChildCount();
|
|
for (int i = 0; i < childCount; i++) {
|
|
// disallowing padding in paged view (just pass 0)
|
|
final View child = getPageAt(i);
|
|
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
|
|
|
|
int childWidthMode;
|
|
int childHeightMode;
|
|
int childWidth;
|
|
int childHeight;
|
|
|
|
if (!lp.isFullScreenPage) {
|
|
if (lp.width == LayoutParams.WRAP_CONTENT) {
|
|
childWidthMode = MeasureSpec.AT_MOST;
|
|
} else {
|
|
childWidthMode = MeasureSpec.EXACTLY;
|
|
}
|
|
|
|
if (lp.height == LayoutParams.WRAP_CONTENT) {
|
|
childHeightMode = MeasureSpec.AT_MOST;
|
|
} else {
|
|
childHeightMode = MeasureSpec.EXACTLY;
|
|
}
|
|
|
|
childWidth = widthSize - horizontalPadding;
|
|
childHeight = heightSize - verticalPadding;
|
|
|
|
} else {
|
|
childWidthMode = MeasureSpec.EXACTLY;
|
|
childHeightMode = MeasureSpec.EXACTLY;
|
|
|
|
childWidth = getViewportWidth();
|
|
childHeight = getViewportHeight();
|
|
}
|
|
|
|
final int childWidthMeasureSpec =
|
|
MeasureSpec.makeMeasureSpec(childWidth, childWidthMode);
|
|
final int childHeightMeasureSpec =
|
|
MeasureSpec.makeMeasureSpec(childHeight, childHeightMode);
|
|
child.measure(childWidthMeasureSpec, childHeightMeasureSpec);
|
|
}
|
|
setMeasuredDimension(scaledWidthSize, scaledHeightSize);
|
|
|
|
// We can't call getChildOffset/getRelativeChildOffset until we set the measured dimensions.
|
|
// We also wait until we set the measured dimensions before flushing the cache as well, to
|
|
// ensure that the cache is filled with good values.
|
|
invalidateCachedOffsets();
|
|
|
|
if (childCount > 0) {
|
|
if (DEBUG) Log.d(TAG, "getRelativeChildOffset(): " + getViewportWidth() + ", "
|
|
+ getChildWidth(0));
|
|
|
|
// Calculate the variable page spacing if necessary
|
|
if (mAutoComputePageSpacing && mRecomputePageSpacing) {
|
|
// The gap between pages in the PagedView should be equal to the gap from the page
|
|
// to the edge of the screen (so it is not visible in the current screen). To
|
|
// account for unequal padding on each side of the paged view, we take the maximum
|
|
// of the left/right gap and use that as the gap between each page.
|
|
int offset = getRelativeChildOffset(0);
|
|
int spacing = Math.max(offset, widthSize - offset -
|
|
getChildAt(0).getMeasuredWidth());
|
|
setPageSpacing(spacing);
|
|
mRecomputePageSpacing = false;
|
|
}
|
|
}
|
|
|
|
if (mScroller.isFinished() && mChildCountOnLastMeasure != getChildCount() &&
|
|
!mDeferringForDelete) {
|
|
setCurrentPage(getNextPage());
|
|
}
|
|
mChildCountOnLastMeasure = getChildCount();
|
|
|
|
updateScrollingIndicatorPosition();
|
|
|
|
if (childCount > 0) {
|
|
final int index = isLayoutRtl() ? 0 : childCount - 1;
|
|
mMaxScrollX = getChildOffset(index) - getRelativeChildOffset(index);
|
|
} else {
|
|
mMaxScrollX = 0;
|
|
}
|
|
}
|
|
|
|
public void setPageSpacing(int pageSpacing) {
|
|
mPageSpacing = pageSpacing;
|
|
invalidateCachedOffsets();
|
|
}
|
|
|
|
@Override
|
|
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
|
|
if (!mIsDataReady || getChildCount() == 0) {
|
|
return;
|
|
}
|
|
|
|
if (DEBUG) Log.d(TAG, "PagedView.onLayout()");
|
|
final int childCount = getChildCount();
|
|
|
|
int offsetX = getViewportOffsetX();
|
|
int offsetY = getViewportOffsetY();
|
|
|
|
// Update the viewport offsets
|
|
mViewport.offset(offsetX, offsetY);
|
|
|
|
final boolean isRtl = isLayoutRtl();
|
|
|
|
final int startIndex = isRtl ? childCount - 1 : 0;
|
|
final int endIndex = isRtl ? -1 : childCount;
|
|
final int delta = isRtl ? -1 : 1;
|
|
|
|
int verticalPadding = getPaddingTop() + getPaddingBottom();
|
|
int childLeft = offsetX + getRelativeChildOffset(startIndex);
|
|
for (int i = startIndex; i != endIndex; i += delta) {
|
|
final View child = getPageAt(i);
|
|
LayoutParams lp = (LayoutParams) child.getLayoutParams();
|
|
int childTop;
|
|
|
|
if (lp.isFullScreenPage) {
|
|
childTop = offsetY;
|
|
} else {
|
|
childTop = offsetY + getPaddingTop();
|
|
if (mCenterPagesVertically) {
|
|
childTop += ((getViewportHeight() - verticalPadding) - child.getMeasuredHeight()) / 2;
|
|
}
|
|
}
|
|
|
|
if (child.getVisibility() != View.GONE) {
|
|
final int childWidth = child.getMeasuredWidth();
|
|
final int childHeight = child.getMeasuredHeight();
|
|
|
|
if (DEBUG) Log.d(TAG, "\tlayout-child" + i + ": " + childLeft + ", " + childTop);
|
|
child.layout(childLeft, childTop,
|
|
childLeft + child.getMeasuredWidth(), childTop + childHeight);
|
|
childLeft += childWidth + mPageSpacing;
|
|
}
|
|
}
|
|
|
|
if (mFirstLayout && mCurrentPage >= 0 && mCurrentPage < getChildCount()) {
|
|
setHorizontalScrollBarEnabled(false);
|
|
updateCurrentPageScroll();
|
|
setHorizontalScrollBarEnabled(true);
|
|
mFirstLayout = false;
|
|
}
|
|
}
|
|
|
|
protected void screenScrolled(int screenCenter) {
|
|
if (isScrollingIndicatorEnabled()) {
|
|
updateScrollingIndicator();
|
|
}
|
|
boolean isInOverscroll = mOverScrollX < 0 || mOverScrollX > mMaxScrollX;
|
|
|
|
if (mFadeInAdjacentScreens && !isInOverscroll) {
|
|
for (int i = 0; i < getChildCount(); i++) {
|
|
View child = getChildAt(i);
|
|
if (child != null) {
|
|
float scrollProgress = getScrollProgress(screenCenter, child, i);
|
|
float alpha = 1 - Math.abs(scrollProgress);
|
|
child.setAlpha(alpha);
|
|
}
|
|
}
|
|
invalidate();
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public void onChildViewAdded(View parent, View child) {
|
|
// This ensures that when children are added, they get the correct transforms / alphas
|
|
// in accordance with any scroll effects.
|
|
mForceScreenScrolled = true;
|
|
mRecomputePageSpacing = true;
|
|
|
|
invalidate();
|
|
invalidateCachedOffsets();
|
|
}
|
|
|
|
@Override
|
|
public void onChildViewRemoved(View parent, View child) {
|
|
mForceScreenScrolled = true;
|
|
invalidate();
|
|
invalidateCachedOffsets();
|
|
}
|
|
|
|
protected void invalidateCachedOffsets() {
|
|
int count = getChildCount();
|
|
if (count == 0) {
|
|
mChildOffsets = null;
|
|
mChildRelativeOffsets = null;
|
|
return;
|
|
}
|
|
|
|
mChildOffsets = new int[count];
|
|
mChildRelativeOffsets = new int[count];
|
|
for (int i = 0; i < count; i++) {
|
|
mChildOffsets[i] = -1;
|
|
mChildRelativeOffsets[i] = -1;
|
|
}
|
|
}
|
|
|
|
protected int getChildOffset(int index) {
|
|
if (index < 0 || index > getChildCount() - 1) return 0;
|
|
|
|
final boolean isRtl = isLayoutRtl();
|
|
int[] childOffsets = mChildOffsets;
|
|
|
|
if (childOffsets != null && childOffsets[index] != -1) {
|
|
return childOffsets[index];
|
|
} else {
|
|
if (getChildCount() == 0)
|
|
return 0;
|
|
|
|
final int startIndex = isRtl ? getChildCount() - 1 : 0;
|
|
final int endIndex = isRtl ? index : index;
|
|
final int delta = isRtl ? -1 : 1;
|
|
|
|
int offset = getRelativeChildOffset(startIndex);
|
|
for (int i = startIndex; i != endIndex; i += delta) {
|
|
offset += getPageAt(i).getMeasuredWidth() + mPageSpacing;
|
|
}
|
|
if (childOffsets != null) {
|
|
childOffsets[index] = offset;
|
|
}
|
|
return offset;
|
|
}
|
|
|
|
}
|
|
|
|
protected int getRelativeChildOffset(int index) {
|
|
if (index < 0 || index > getChildCount() - 1) return 0;
|
|
|
|
if (mChildRelativeOffsets != null && mChildRelativeOffsets[index] != -1) {
|
|
return mChildRelativeOffsets[index];
|
|
} else {
|
|
final int padding = getPaddingLeft() + getPaddingRight();
|
|
final int offset = getPaddingLeft() +
|
|
(getViewportWidth() - padding - getChildWidth(index)) / 2;
|
|
if (mChildRelativeOffsets != null) {
|
|
mChildRelativeOffsets[index] = offset;
|
|
}
|
|
return offset;
|
|
}
|
|
}
|
|
|
|
void boundByReorderablePages(boolean isReordering, int[] range) {
|
|
// Do nothing
|
|
}
|
|
|
|
// TODO: Fix this
|
|
protected void getVisiblePages(int[] range) {
|
|
range[0] = 0;
|
|
range[1] = getPageCount() - 1;
|
|
|
|
/*
|
|
final int pageCount = getChildCount();
|
|
|
|
if (pageCount > 0) {
|
|
final int screenWidth = getViewportWidth();
|
|
int leftScreen = 0;
|
|
int rightScreen = 0;
|
|
int offsetX = getViewportOffsetX() + getScrollX();
|
|
View currPage = getPageAt(leftScreen);
|
|
while (leftScreen < pageCount - 1 &&
|
|
currPage.getX() + currPage.getWidth() -
|
|
currPage.getPaddingRight() < offsetX) {
|
|
leftScreen++;
|
|
currPage = getPageAt(leftScreen);
|
|
}
|
|
rightScreen = leftScreen;
|
|
currPage = getPageAt(rightScreen + 1);
|
|
while (rightScreen < pageCount - 1 &&
|
|
currPage.getX() - currPage.getPaddingLeft() < offsetX + screenWidth) {
|
|
rightScreen++;
|
|
currPage = getPageAt(rightScreen + 1);
|
|
}
|
|
|
|
// TEMP: this is a hacky way to ensure that animations to new pages are not clipped
|
|
// because we don't draw them while scrolling?
|
|
range[0] = Math.max(0, leftScreen - 1);
|
|
range[1] = Math.min(rightScreen + 1, getChildCount() - 1);
|
|
} else {
|
|
range[0] = -1;
|
|
range[1] = -1;
|
|
}
|
|
*/
|
|
}
|
|
|
|
protected boolean shouldDrawChild(View child) {
|
|
return child.getAlpha() > 0;
|
|
}
|
|
|
|
@Override
|
|
protected void dispatchDraw(Canvas canvas) {
|
|
int halfScreenSize = getViewportWidth() / 2;
|
|
// mOverScrollX is equal to getScrollX() when we're within the normal scroll range.
|
|
// Otherwise it is equal to the scaled overscroll position.
|
|
int screenCenter = mOverScrollX + halfScreenSize;
|
|
|
|
if (screenCenter != mLastScreenCenter || mForceScreenScrolled) {
|
|
// set mForceScreenScrolled before calling screenScrolled so that screenScrolled can
|
|
// set it for the next frame
|
|
mForceScreenScrolled = false;
|
|
screenScrolled(screenCenter);
|
|
mLastScreenCenter = screenCenter;
|
|
}
|
|
|
|
// Find out which screens are visible; as an optimization we only call draw on them
|
|
final int pageCount = getChildCount();
|
|
if (pageCount > 0) {
|
|
getVisiblePages(mTempVisiblePagesRange);
|
|
final int leftScreen = mTempVisiblePagesRange[0];
|
|
final int rightScreen = mTempVisiblePagesRange[1];
|
|
if (leftScreen != -1 && rightScreen != -1) {
|
|
final long drawingTime = getDrawingTime();
|
|
// Clip to the bounds
|
|
canvas.save();
|
|
canvas.clipRect(getScrollX(), getScrollY(), getScrollX() + getRight() - getLeft(),
|
|
getScrollY() + getBottom() - getTop());
|
|
|
|
// Draw all the children, leaving the drag view for last
|
|
for (int i = pageCount - 1; i >= 0; i--) {
|
|
final View v = getPageAt(i);
|
|
if (v == mDragView) continue;
|
|
if (mForceDrawAllChildrenNextFrame ||
|
|
(leftScreen <= i && i <= rightScreen && shouldDrawChild(v))) {
|
|
drawChild(canvas, v, drawingTime);
|
|
}
|
|
}
|
|
// Draw the drag view on top (if there is one)
|
|
if (mDragView != null) {
|
|
drawChild(canvas, mDragView, drawingTime);
|
|
}
|
|
|
|
mForceDrawAllChildrenNextFrame = false;
|
|
canvas.restore();
|
|
}
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) {
|
|
int page = indexToPage(indexOfChild(child));
|
|
if (page != mCurrentPage || !mScroller.isFinished()) {
|
|
snapToPage(page);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
@Override
|
|
protected boolean onRequestFocusInDescendants(int direction, Rect previouslyFocusedRect) {
|
|
int focusablePage;
|
|
if (mNextPage != INVALID_PAGE) {
|
|
focusablePage = mNextPage;
|
|
} else {
|
|
focusablePage = mCurrentPage;
|
|
}
|
|
View v = getPageAt(focusablePage);
|
|
if (v != null) {
|
|
return v.requestFocus(direction, previouslyFocusedRect);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
@Override
|
|
public boolean dispatchUnhandledMove(View focused, int direction) {
|
|
// XXX-RTL: This will be fixed in a future CL
|
|
if (direction == View.FOCUS_LEFT) {
|
|
if (getCurrentPage() > 0) {
|
|
snapToPage(getCurrentPage() - 1);
|
|
return true;
|
|
}
|
|
} else if (direction == View.FOCUS_RIGHT) {
|
|
if (getCurrentPage() < getPageCount() - 1) {
|
|
snapToPage(getCurrentPage() + 1);
|
|
return true;
|
|
}
|
|
}
|
|
return super.dispatchUnhandledMove(focused, direction);
|
|
}
|
|
|
|
@Override
|
|
public void addFocusables(ArrayList<View> views, int direction, int focusableMode) {
|
|
// XXX-RTL: This will be fixed in a future CL
|
|
if (mCurrentPage >= 0 && mCurrentPage < getPageCount()) {
|
|
getPageAt(mCurrentPage).addFocusables(views, direction, focusableMode);
|
|
}
|
|
if (direction == View.FOCUS_LEFT) {
|
|
if (mCurrentPage > 0) {
|
|
getPageAt(mCurrentPage - 1).addFocusables(views, direction, focusableMode);
|
|
}
|
|
} else if (direction == View.FOCUS_RIGHT){
|
|
if (mCurrentPage < getPageCount() - 1) {
|
|
getPageAt(mCurrentPage + 1).addFocusables(views, direction, focusableMode);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* If one of our descendant views decides that it could be focused now, only
|
|
* pass that along if it's on the current page.
|
|
*
|
|
* This happens when live folders requery, and if they're off page, they
|
|
* end up calling requestFocus, which pulls it on page.
|
|
*/
|
|
@Override
|
|
public void focusableViewAvailable(View focused) {
|
|
View current = getPageAt(mCurrentPage);
|
|
View v = focused;
|
|
while (true) {
|
|
if (v == current) {
|
|
super.focusableViewAvailable(focused);
|
|
return;
|
|
}
|
|
if (v == this) {
|
|
return;
|
|
}
|
|
ViewParent parent = v.getParent();
|
|
if (parent instanceof View) {
|
|
v = (View)v.getParent();
|
|
} else {
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
*/
|
|
@Override
|
|
public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) {
|
|
if (disallowIntercept) {
|
|
// We need to make sure to cancel our long press if
|
|
// a scrollable widget takes over touch events
|
|
final View currentPage = getPageAt(mCurrentPage);
|
|
currentPage.cancelLongPress();
|
|
}
|
|
super.requestDisallowInterceptTouchEvent(disallowIntercept);
|
|
}
|
|
|
|
/**
|
|
* Return true if a tap at (x, y) should trigger a flip to the previous page.
|
|
*/
|
|
protected boolean hitsPreviousPage(float x, float y) {
|
|
if (isLayoutRtl()) {
|
|
return (x > (getViewportOffsetX() + getViewportWidth() -
|
|
getRelativeChildOffset(mCurrentPage) + mPageSpacing));
|
|
}
|
|
return (x < getViewportOffsetX() + getRelativeChildOffset(mCurrentPage) - mPageSpacing);
|
|
}
|
|
|
|
/**
|
|
* Return true if a tap at (x, y) should trigger a flip to the next page.
|
|
*/
|
|
protected boolean hitsNextPage(float x, float y) {
|
|
if (isLayoutRtl()) {
|
|
return (x < getViewportOffsetX() + getRelativeChildOffset(mCurrentPage) - mPageSpacing);
|
|
}
|
|
return (x > (getViewportOffsetX() + getViewportWidth() -
|
|
getRelativeChildOffset(mCurrentPage) + mPageSpacing));
|
|
}
|
|
|
|
/** Returns whether x and y originated within the buffered viewport */
|
|
private boolean isTouchPointInViewportWithBuffer(int x, int y) {
|
|
mTmpRect.set(mViewport.left - mViewport.width() / 2, mViewport.top,
|
|
mViewport.right + mViewport.width() / 2, mViewport.bottom);
|
|
return mTmpRect.contains(x, y);
|
|
}
|
|
|
|
/** Returns whether x and y originated within the current page view bounds */
|
|
private boolean isTouchPointInCurrentPage(int x, int y) {
|
|
View v = getPageAt(getCurrentPage());
|
|
if (v != null) {
|
|
mTmpRect.set((v.getLeft() - getScrollX()), 0, (v.getRight() - getScrollX()),
|
|
v.getBottom());
|
|
return mTmpRect.contains(x, y);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
@Override
|
|
public boolean onInterceptTouchEvent(MotionEvent ev) {
|
|
if (DISABLE_TOUCH_INTERACTION) {
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* This method JUST determines whether we want to intercept the motion.
|
|
* If we return true, onTouchEvent will be called and we do the actual
|
|
* scrolling there.
|
|
*/
|
|
acquireVelocityTrackerAndAddMovement(ev);
|
|
|
|
// Skip touch handling if there are no pages to swipe
|
|
if (getChildCount() <= 0) return super.onInterceptTouchEvent(ev);
|
|
|
|
/*
|
|
* Shortcut the most recurring case: the user is in the dragging
|
|
* state and he is moving his finger. We want to intercept this
|
|
* motion.
|
|
*/
|
|
final int action = ev.getAction();
|
|
if ((action == MotionEvent.ACTION_MOVE) &&
|
|
(mTouchState == TOUCH_STATE_SCROLLING)) {
|
|
return true;
|
|
}
|
|
|
|
switch (action & MotionEvent.ACTION_MASK) {
|
|
case MotionEvent.ACTION_MOVE: {
|
|
/*
|
|
* mIsBeingDragged == false, otherwise the shortcut would have caught it. Check
|
|
* whether the user has moved far enough from his original down touch.
|
|
*/
|
|
if (mActivePointerId != INVALID_POINTER) {
|
|
determineScrollingStart(ev);
|
|
break;
|
|
}
|
|
// if mActivePointerId is INVALID_POINTER, then we must have missed an ACTION_DOWN
|
|
// event. in that case, treat the first occurence of a move event as a ACTION_DOWN
|
|
// i.e. fall through to the next case (don't break)
|
|
// (We sometimes miss ACTION_DOWN events in Workspace because it ignores all events
|
|
// while it's small- this was causing a crash before we checked for INVALID_POINTER)
|
|
}
|
|
|
|
case MotionEvent.ACTION_DOWN: {
|
|
final float x = ev.getX();
|
|
final float y = ev.getY();
|
|
// Remember location of down touch
|
|
mDownMotionX = x;
|
|
mDownMotionY = y;
|
|
mDownScrollX = getScrollX();
|
|
mLastMotionX = x;
|
|
mLastMotionY = y;
|
|
float[] p = mapPointFromViewToParent(this, x, y);
|
|
mParentDownMotionX = p[0];
|
|
mParentDownMotionY = p[1];
|
|
mLastMotionXRemainder = 0;
|
|
mTotalMotionX = 0;
|
|
mActivePointerId = ev.getPointerId(0);
|
|
|
|
// Determine if the down event is within the threshold to be an edge swipe
|
|
int leftEdgeBoundary = getViewportOffsetX() + mEdgeSwipeRegionSize;
|
|
int rightEdgeBoundary = getMeasuredWidth() - getViewportOffsetX() - mEdgeSwipeRegionSize;
|
|
if ((mDownMotionX <= leftEdgeBoundary || mDownMotionX >= rightEdgeBoundary)) {
|
|
mDownEventOnEdge = true;
|
|
}
|
|
|
|
/*
|
|
* If being flinged and user touches the screen, initiate drag;
|
|
* otherwise don't. mScroller.isFinished should be false when
|
|
* being flinged.
|
|
*/
|
|
final int xDist = Math.abs(mScroller.getFinalX() - mScroller.getCurrX());
|
|
final boolean finishedScrolling = (mScroller.isFinished() || xDist < mTouchSlop);
|
|
if (finishedScrolling) {
|
|
mTouchState = TOUCH_STATE_REST;
|
|
mScroller.abortAnimation();
|
|
} else {
|
|
if (isTouchPointInViewportWithBuffer((int) mDownMotionX, (int) mDownMotionY)) {
|
|
mTouchState = TOUCH_STATE_SCROLLING;
|
|
} else {
|
|
mTouchState = TOUCH_STATE_REST;
|
|
}
|
|
}
|
|
|
|
// check if this can be the beginning of a tap on the side of the pages
|
|
// to scroll the current page
|
|
if (!DISABLE_TOUCH_SIDE_PAGES) {
|
|
if (mTouchState != TOUCH_STATE_PREV_PAGE && mTouchState != TOUCH_STATE_NEXT_PAGE) {
|
|
if (getChildCount() > 0) {
|
|
if (hitsPreviousPage(x, y)) {
|
|
mTouchState = TOUCH_STATE_PREV_PAGE;
|
|
} else if (hitsNextPage(x, y)) {
|
|
mTouchState = TOUCH_STATE_NEXT_PAGE;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
case MotionEvent.ACTION_UP:
|
|
case MotionEvent.ACTION_CANCEL:
|
|
resetTouchState();
|
|
// Just intercept the touch event on up if we tap outside the strict viewport
|
|
if (!isTouchPointInCurrentPage((int) mLastMotionX, (int) mLastMotionY)) {
|
|
return true;
|
|
}
|
|
break;
|
|
|
|
case MotionEvent.ACTION_POINTER_UP:
|
|
onSecondaryPointerUp(ev);
|
|
releaseVelocityTracker();
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* The only time we want to intercept motion events is if we are in the
|
|
* drag mode.
|
|
*/
|
|
return mTouchState != TOUCH_STATE_REST;
|
|
}
|
|
|
|
protected void determineScrollingStart(MotionEvent ev) {
|
|
determineScrollingStart(ev, 1.0f);
|
|
}
|
|
|
|
/*
|
|
* Determines if we should change the touch state to start scrolling after the
|
|
* user moves their touch point too far.
|
|
*/
|
|
protected void determineScrollingStart(MotionEvent ev, float touchSlopScale) {
|
|
// Disallow scrolling if we don't have a valid pointer index
|
|
final int pointerIndex = ev.findPointerIndex(mActivePointerId);
|
|
if (pointerIndex == -1) return;
|
|
|
|
// Disallow scrolling if we started the gesture from outside the viewport
|
|
final float x = ev.getX(pointerIndex);
|
|
final float y = ev.getY(pointerIndex);
|
|
if (!isTouchPointInViewportWithBuffer((int) x, (int) y)) return;
|
|
|
|
// If we're only allowing edge swipes, we break out early if the down event wasn't
|
|
// at the edge.
|
|
if (mOnlyAllowEdgeSwipes && !mDownEventOnEdge) return;
|
|
|
|
final int xDiff = (int) Math.abs(x - mLastMotionX);
|
|
final int yDiff = (int) Math.abs(y - mLastMotionY);
|
|
|
|
final int touchSlop = Math.round(touchSlopScale * mTouchSlop);
|
|
boolean xPaged = xDiff > mPagingTouchSlop;
|
|
boolean xMoved = xDiff > touchSlop;
|
|
boolean yMoved = yDiff > touchSlop;
|
|
|
|
if (xMoved || xPaged || yMoved) {
|
|
if (mUsePagingTouchSlop ? xPaged : xMoved) {
|
|
// Scroll if the user moved far enough along the X axis
|
|
mTouchState = TOUCH_STATE_SCROLLING;
|
|
mTotalMotionX += Math.abs(mLastMotionX - x);
|
|
mLastMotionX = x;
|
|
mLastMotionXRemainder = 0;
|
|
mTouchX = getViewportOffsetX() + getScrollX();
|
|
mSmoothingTime = System.nanoTime() / NANOTIME_DIV;
|
|
pageBeginMoving();
|
|
}
|
|
}
|
|
}
|
|
|
|
protected float getMaxScrollProgress() {
|
|
return 1.0f;
|
|
}
|
|
|
|
protected void cancelCurrentPageLongPress() {
|
|
if (mAllowLongPress) {
|
|
//mAllowLongPress = false;
|
|
// Try canceling the long press. It could also have been scheduled
|
|
// by a distant descendant, so use the mAllowLongPress flag to block
|
|
// everything
|
|
final View currentPage = getPageAt(mCurrentPage);
|
|
if (currentPage != null) {
|
|
currentPage.cancelLongPress();
|
|
}
|
|
}
|
|
}
|
|
|
|
protected float getBoundedScrollProgress(int screenCenter, View v, int page) {
|
|
final int halfScreenSize = getViewportWidth() / 2;
|
|
|
|
screenCenter = Math.min(getScrollX() + halfScreenSize, screenCenter);
|
|
screenCenter = Math.max(halfScreenSize, screenCenter);
|
|
|
|
return getScrollProgress(screenCenter, v, page);
|
|
}
|
|
|
|
protected float getScrollProgress(int screenCenter, View v, int page) {
|
|
final int halfScreenSize = getViewportWidth() / 2;
|
|
|
|
int totalDistance = v.getMeasuredWidth() + mPageSpacing;
|
|
int delta = screenCenter - (getChildOffset(page) -
|
|
getRelativeChildOffset(page) + halfScreenSize);
|
|
|
|
float scrollProgress = delta / (totalDistance * 1.0f);
|
|
scrollProgress = Math.min(scrollProgress, getMaxScrollProgress());
|
|
scrollProgress = Math.max(scrollProgress, - getMaxScrollProgress());
|
|
return scrollProgress;
|
|
}
|
|
|
|
// This curve determines how the effect of scrolling over the limits of the page dimishes
|
|
// as the user pulls further and further from the bounds
|
|
private float overScrollInfluenceCurve(float f) {
|
|
f -= 1.0f;
|
|
return f * f * f + 1.0f;
|
|
}
|
|
|
|
protected void acceleratedOverScroll(float amount) {
|
|
int screenSize = getViewportWidth();
|
|
|
|
// We want to reach the max over scroll effect when the user has
|
|
// over scrolled half the size of the screen
|
|
float f = OVERSCROLL_ACCELERATE_FACTOR * (amount / screenSize);
|
|
|
|
if (f == 0) return;
|
|
|
|
// Clamp this factor, f, to -1 < f < 1
|
|
if (Math.abs(f) >= 1) {
|
|
f /= Math.abs(f);
|
|
}
|
|
|
|
int overScrollAmount = (int) Math.round(f * screenSize);
|
|
if (amount < 0) {
|
|
mOverScrollX = overScrollAmount;
|
|
super.scrollTo(0, getScrollY());
|
|
} else {
|
|
mOverScrollX = mMaxScrollX + overScrollAmount;
|
|
super.scrollTo(mMaxScrollX, getScrollY());
|
|
}
|
|
invalidate();
|
|
}
|
|
|
|
protected void dampedOverScroll(float amount) {
|
|
int screenSize = getViewportWidth();
|
|
|
|
float f = (amount / screenSize);
|
|
|
|
if (f == 0) return;
|
|
f = f / (Math.abs(f)) * (overScrollInfluenceCurve(Math.abs(f)));
|
|
|
|
// Clamp this factor, f, to -1 < f < 1
|
|
if (Math.abs(f) >= 1) {
|
|
f /= Math.abs(f);
|
|
}
|
|
|
|
int overScrollAmount = (int) Math.round(OVERSCROLL_DAMP_FACTOR * f * screenSize);
|
|
if (amount < 0) {
|
|
mOverScrollX = overScrollAmount;
|
|
super.scrollTo(0, getScrollY());
|
|
} else {
|
|
mOverScrollX = mMaxScrollX + overScrollAmount;
|
|
super.scrollTo(mMaxScrollX, getScrollY());
|
|
}
|
|
invalidate();
|
|
}
|
|
|
|
protected void overScroll(float amount) {
|
|
dampedOverScroll(amount);
|
|
}
|
|
|
|
protected float maxOverScroll() {
|
|
// Using the formula in overScroll, assuming that f = 1.0 (which it should generally not
|
|
// exceed). Used to find out how much extra wallpaper we need for the over scroll effect
|
|
float f = 1.0f;
|
|
f = f / (Math.abs(f)) * (overScrollInfluenceCurve(Math.abs(f)));
|
|
return OVERSCROLL_DAMP_FACTOR * f;
|
|
}
|
|
|
|
@Override
|
|
public boolean onTouchEvent(MotionEvent ev) {
|
|
if (DISABLE_TOUCH_INTERACTION) {
|
|
return false;
|
|
}
|
|
|
|
// Skip touch handling if there are no pages to swipe
|
|
if (getChildCount() <= 0) return super.onTouchEvent(ev);
|
|
|
|
acquireVelocityTrackerAndAddMovement(ev);
|
|
|
|
final int action = ev.getAction();
|
|
|
|
switch (action & MotionEvent.ACTION_MASK) {
|
|
case MotionEvent.ACTION_DOWN:
|
|
/*
|
|
* If being flinged and user touches, stop the fling. isFinished
|
|
* will be false if being flinged.
|
|
*/
|
|
if (!mScroller.isFinished()) {
|
|
mScroller.abortAnimation();
|
|
}
|
|
|
|
// Remember where the motion event started
|
|
mDownMotionX = mLastMotionX = ev.getX();
|
|
mDownMotionY = mLastMotionY = ev.getY();
|
|
mDownScrollX = getScrollX();
|
|
float[] p = mapPointFromViewToParent(this, mLastMotionX, mLastMotionY);
|
|
mParentDownMotionX = p[0];
|
|
mParentDownMotionY = p[1];
|
|
mLastMotionXRemainder = 0;
|
|
mTotalMotionX = 0;
|
|
mActivePointerId = ev.getPointerId(0);
|
|
|
|
// Determine if the down event is within the threshold to be an edge swipe
|
|
int leftEdgeBoundary = getViewportOffsetX() + mEdgeSwipeRegionSize;
|
|
int rightEdgeBoundary = getMeasuredWidth() - getViewportOffsetX() - mEdgeSwipeRegionSize;
|
|
if ((mDownMotionX <= leftEdgeBoundary || mDownMotionX >= rightEdgeBoundary)) {
|
|
mDownEventOnEdge = true;
|
|
}
|
|
|
|
if (mTouchState == TOUCH_STATE_SCROLLING) {
|
|
pageBeginMoving();
|
|
}
|
|
break;
|
|
|
|
case MotionEvent.ACTION_MOVE:
|
|
if (mTouchState == TOUCH_STATE_SCROLLING) {
|
|
// Scroll to follow the motion event
|
|
final int pointerIndex = ev.findPointerIndex(mActivePointerId);
|
|
|
|
if (pointerIndex == -1) return true;
|
|
|
|
final float x = ev.getX(pointerIndex);
|
|
final float deltaX = mLastMotionX + mLastMotionXRemainder - x;
|
|
|
|
mTotalMotionX += Math.abs(deltaX);
|
|
|
|
// Only scroll and update mLastMotionX if we have moved some discrete amount. We
|
|
// keep the remainder because we are actually testing if we've moved from the last
|
|
// scrolled position (which is discrete).
|
|
if (Math.abs(deltaX) >= 1.0f) {
|
|
mTouchX += deltaX;
|
|
mSmoothingTime = System.nanoTime() / NANOTIME_DIV;
|
|
if (!mDeferScrollUpdate) {
|
|
scrollBy((int) deltaX, 0);
|
|
if (DEBUG) Log.d(TAG, "onTouchEvent().Scrolling: " + deltaX);
|
|
} else {
|
|
invalidate();
|
|
}
|
|
mLastMotionX = x;
|
|
mLastMotionXRemainder = deltaX - (int) deltaX;
|
|
} else {
|
|
awakenScrollBars();
|
|
}
|
|
} else if (mTouchState == TOUCH_STATE_REORDERING) {
|
|
// Update the last motion position
|
|
mLastMotionX = ev.getX();
|
|
mLastMotionY = ev.getY();
|
|
|
|
// Update the parent down so that our zoom animations take this new movement into
|
|
// account
|
|
float[] pt = mapPointFromViewToParent(this, mLastMotionX, mLastMotionY);
|
|
mParentDownMotionX = pt[0];
|
|
mParentDownMotionY = pt[1];
|
|
updateDragViewTranslationDuringDrag();
|
|
|
|
// Find the closest page to the touch point
|
|
final int dragViewIndex = indexOfChild(mDragView);
|
|
int bufferSize = (int) (REORDERING_SIDE_PAGE_BUFFER_PERCENTAGE *
|
|
getViewportWidth());
|
|
int leftBufferEdge = (int) (mapPointFromViewToParent(this, mViewport.left, 0)[0]
|
|
+ bufferSize);
|
|
int rightBufferEdge = (int) (mapPointFromViewToParent(this, mViewport.right, 0)[0]
|
|
- bufferSize);
|
|
|
|
// Change the drag view if we are hovering over the drop target
|
|
boolean isHoveringOverDelete = isHoveringOverDeleteDropTarget(
|
|
(int) mParentDownMotionX, (int) mParentDownMotionY);
|
|
setPageHoveringOverDeleteDropTarget(dragViewIndex, isHoveringOverDelete);
|
|
|
|
if (DEBUG) Log.d(TAG, "leftBufferEdge: " + leftBufferEdge);
|
|
if (DEBUG) Log.d(TAG, "rightBufferEdge: " + rightBufferEdge);
|
|
if (DEBUG) Log.d(TAG, "mLastMotionX: " + mLastMotionX);
|
|
if (DEBUG) Log.d(TAG, "mLastMotionY: " + mLastMotionY);
|
|
if (DEBUG) Log.d(TAG, "mParentDownMotionX: " + mParentDownMotionX);
|
|
if (DEBUG) Log.d(TAG, "mParentDownMotionY: " + mParentDownMotionY);
|
|
|
|
float parentX = mParentDownMotionX;
|
|
int pageIndexToSnapTo = -1;
|
|
if (parentX < leftBufferEdge && dragViewIndex > 0) {
|
|
pageIndexToSnapTo = dragViewIndex - 1;
|
|
} else if (parentX > rightBufferEdge && dragViewIndex < getChildCount() - 1) {
|
|
pageIndexToSnapTo = dragViewIndex + 1;
|
|
}
|
|
|
|
final int pageUnderPointIndex = pageIndexToSnapTo;
|
|
if (pageUnderPointIndex > -1 && !isHoveringOverDelete) {
|
|
mTempVisiblePagesRange[0] = 0;
|
|
mTempVisiblePagesRange[1] = getPageCount() - 1;
|
|
boundByReorderablePages(true, mTempVisiblePagesRange);
|
|
if (mTempVisiblePagesRange[0] <= pageUnderPointIndex &&
|
|
pageUnderPointIndex <= mTempVisiblePagesRange[1] &&
|
|
pageUnderPointIndex != mSidePageHoverIndex && mScroller.isFinished()) {
|
|
mSidePageHoverIndex = pageUnderPointIndex;
|
|
mSidePageHoverRunnable = new Runnable() {
|
|
@Override
|
|
public void run() {
|
|
// Update the down scroll position to account for the fact that the
|
|
// current page is moved
|
|
mDownScrollX = getChildOffset(pageUnderPointIndex)
|
|
- getRelativeChildOffset(pageUnderPointIndex);
|
|
|
|
// Setup the scroll to the correct page before we swap the views
|
|
snapToPage(pageUnderPointIndex);
|
|
|
|
// For each of the pages between the paged view and the drag view,
|
|
// animate them from the previous position to the new position in
|
|
// the layout (as a result of the drag view moving in the layout)
|
|
int shiftDelta = (dragViewIndex < pageUnderPointIndex) ? -1 : 1;
|
|
int lowerIndex = (dragViewIndex < pageUnderPointIndex) ?
|
|
dragViewIndex + 1 : pageUnderPointIndex;
|
|
int upperIndex = (dragViewIndex > pageUnderPointIndex) ?
|
|
dragViewIndex - 1 : pageUnderPointIndex;
|
|
for (int i = lowerIndex; i <= upperIndex; ++i) {
|
|
View v = getChildAt(i);
|
|
// dragViewIndex < pageUnderPointIndex, so after we remove the
|
|
// drag view all subsequent views to pageUnderPointIndex will
|
|
// shift down.
|
|
int oldX = getViewportOffsetX() + getChildOffset(i);
|
|
int newX = getViewportOffsetX() + getChildOffset(i + shiftDelta);
|
|
|
|
// Animate the view translation from its old position to its new
|
|
// position
|
|
AnimatorSet anim = (AnimatorSet) v.getTag(ANIM_TAG_KEY);
|
|
if (anim != null) {
|
|
anim.cancel();
|
|
}
|
|
|
|
v.setTranslationX(oldX - newX);
|
|
anim = new AnimatorSet();
|
|
anim.setDuration(REORDERING_REORDER_REPOSITION_DURATION);
|
|
anim.playTogether(
|
|
ObjectAnimator.ofFloat(v, "translationX", 0f));
|
|
anim.start();
|
|
v.setTag(anim);
|
|
}
|
|
|
|
removeView(mDragView);
|
|
onRemoveView(mDragView, false);
|
|
addView(mDragView, pageUnderPointIndex);
|
|
onAddView(mDragView, pageUnderPointIndex);
|
|
mSidePageHoverIndex = -1;
|
|
}
|
|
};
|
|
postDelayed(mSidePageHoverRunnable, REORDERING_SIDE_PAGE_HOVER_TIMEOUT);
|
|
}
|
|
} else {
|
|
removeCallbacks(mSidePageHoverRunnable);
|
|
mSidePageHoverIndex = -1;
|
|
}
|
|
} else {
|
|
determineScrollingStart(ev);
|
|
}
|
|
break;
|
|
|
|
case MotionEvent.ACTION_UP:
|
|
if (mTouchState == TOUCH_STATE_SCROLLING) {
|
|
final int activePointerId = mActivePointerId;
|
|
final int pointerIndex = ev.findPointerIndex(activePointerId);
|
|
final float x = ev.getX(pointerIndex);
|
|
final VelocityTracker velocityTracker = mVelocityTracker;
|
|
velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
|
|
int velocityX = (int) velocityTracker.getXVelocity(activePointerId);
|
|
final int deltaX = (int) (x - mDownMotionX);
|
|
final int pageWidth = getPageAt(mCurrentPage).getMeasuredWidth();
|
|
boolean isSignificantMove = Math.abs(deltaX) > pageWidth *
|
|
SIGNIFICANT_MOVE_THRESHOLD;
|
|
|
|
mTotalMotionX += Math.abs(mLastMotionX + mLastMotionXRemainder - x);
|
|
|
|
boolean isFling = mTotalMotionX > MIN_LENGTH_FOR_FLING &&
|
|
Math.abs(velocityX) > mFlingThresholdVelocity;
|
|
|
|
// In the case that the page is moved far to one direction and then is flung
|
|
// in the opposite direction, we use a threshold to determine whether we should
|
|
// just return to the starting page, or if we should skip one further.
|
|
boolean returnToOriginalPage = false;
|
|
if (Math.abs(deltaX) > pageWidth * RETURN_TO_ORIGINAL_PAGE_THRESHOLD &&
|
|
Math.signum(velocityX) != Math.signum(deltaX) && isFling) {
|
|
returnToOriginalPage = true;
|
|
}
|
|
|
|
int finalPage;
|
|
// We give flings precedence over large moves, which is why we short-circuit our
|
|
// test for a large move if a fling has been registered. That is, a large
|
|
// move to the left and fling to the right will register as a fling to the right.
|
|
final boolean isRtl = isLayoutRtl();
|
|
boolean isDeltaXLeft = isRtl ? deltaX > 0 : deltaX < 0;
|
|
boolean isVelocityXLeft = isRtl ? velocityX > 0 : velocityX < 0;
|
|
if (((isSignificantMove && !isDeltaXLeft && !isFling) ||
|
|
(isFling && !isVelocityXLeft)) && mCurrentPage > 0) {
|
|
finalPage = returnToOriginalPage ? mCurrentPage : mCurrentPage - 1;
|
|
snapToPageWithVelocity(finalPage, velocityX);
|
|
} else if (((isSignificantMove && isDeltaXLeft && !isFling) ||
|
|
(isFling && isVelocityXLeft)) &&
|
|
mCurrentPage < getChildCount() - 1) {
|
|
finalPage = returnToOriginalPage ? mCurrentPage : mCurrentPage + 1;
|
|
snapToPageWithVelocity(finalPage, velocityX);
|
|
} else {
|
|
snapToDestination();
|
|
} } else if (mTouchState == TOUCH_STATE_PREV_PAGE) {
|
|
// at this point we have not moved beyond the touch slop
|
|
// (otherwise mTouchState would be TOUCH_STATE_SCROLLING), so
|
|
// we can just page
|
|
int nextPage = Math.max(0, mCurrentPage - 1);
|
|
if (nextPage != mCurrentPage) {
|
|
snapToPage(nextPage);
|
|
} else {
|
|
snapToDestination();
|
|
}
|
|
} else if (mTouchState == TOUCH_STATE_NEXT_PAGE) {
|
|
// at this point we have not moved beyond the touch slop
|
|
// (otherwise mTouchState would be TOUCH_STATE_SCROLLING), so
|
|
// we can just page
|
|
int nextPage = Math.min(getChildCount() - 1, mCurrentPage + 1);
|
|
if (nextPage != mCurrentPage) {
|
|
snapToPage(nextPage);
|
|
} else {
|
|
snapToDestination();
|
|
}
|
|
} else if (mTouchState == TOUCH_STATE_REORDERING) {
|
|
// Update the last motion position
|
|
mLastMotionX = ev.getX();
|
|
mLastMotionY = ev.getY();
|
|
|
|
// Update the parent down so that our zoom animations take this new movement into
|
|
// account
|
|
float[] pt = mapPointFromViewToParent(this, mLastMotionX, mLastMotionY);
|
|
mParentDownMotionX = pt[0];
|
|
mParentDownMotionY = pt[1];
|
|
updateDragViewTranslationDuringDrag();
|
|
boolean handledFling = false;
|
|
if (!DISABLE_FLING_TO_DELETE) {
|
|
// Check the velocity and see if we are flinging-to-delete
|
|
PointF flingToDeleteVector = isFlingingToDelete();
|
|
if (flingToDeleteVector != null) {
|
|
onFlingToDelete(flingToDeleteVector);
|
|
handledFling = true;
|
|
}
|
|
}
|
|
if (!handledFling && isHoveringOverDeleteDropTarget((int) mParentDownMotionX,
|
|
(int) mParentDownMotionY)) {
|
|
onDropToDelete();
|
|
}
|
|
} else {
|
|
onUnhandledTap(ev);
|
|
}
|
|
|
|
// Remove the callback to wait for the side page hover timeout
|
|
removeCallbacks(mSidePageHoverRunnable);
|
|
// End any intermediate reordering states
|
|
resetTouchState();
|
|
break;
|
|
|
|
case MotionEvent.ACTION_CANCEL:
|
|
if (mTouchState == TOUCH_STATE_SCROLLING) {
|
|
snapToDestination();
|
|
}
|
|
resetTouchState();
|
|
break;
|
|
|
|
case MotionEvent.ACTION_POINTER_UP:
|
|
onSecondaryPointerUp(ev);
|
|
break;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
public void onFlingToDelete(View v) {}
|
|
public void onRemoveView(View v, boolean deletePermanently) {}
|
|
public void onRemoveViewAnimationCompleted() {}
|
|
public void onAddView(View v, int index) {}
|
|
|
|
private void resetTouchState() {
|
|
releaseVelocityTracker();
|
|
endReordering();
|
|
mTouchState = TOUCH_STATE_REST;
|
|
mActivePointerId = INVALID_POINTER;
|
|
mDownEventOnEdge = false;
|
|
}
|
|
|
|
protected void onUnhandledTap(MotionEvent ev) {}
|
|
|
|
@Override
|
|
public boolean onGenericMotionEvent(MotionEvent event) {
|
|
if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) {
|
|
switch (event.getAction()) {
|
|
case MotionEvent.ACTION_SCROLL: {
|
|
// Handle mouse (or ext. device) by shifting the page depending on the scroll
|
|
final float vscroll;
|
|
final float hscroll;
|
|
if ((event.getMetaState() & KeyEvent.META_SHIFT_ON) != 0) {
|
|
vscroll = 0;
|
|
hscroll = event.getAxisValue(MotionEvent.AXIS_VSCROLL);
|
|
} else {
|
|
vscroll = -event.getAxisValue(MotionEvent.AXIS_VSCROLL);
|
|
hscroll = event.getAxisValue(MotionEvent.AXIS_HSCROLL);
|
|
}
|
|
if (hscroll != 0 || vscroll != 0) {
|
|
boolean isForwardScroll = isLayoutRtl() ? (hscroll < 0 || vscroll < 0)
|
|
: (hscroll > 0 || vscroll > 0);
|
|
if (isForwardScroll) {
|
|
scrollRight();
|
|
} else {
|
|
scrollLeft();
|
|
}
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return super.onGenericMotionEvent(event);
|
|
}
|
|
|
|
private void acquireVelocityTrackerAndAddMovement(MotionEvent ev) {
|
|
if (mVelocityTracker == null) {
|
|
mVelocityTracker = VelocityTracker.obtain();
|
|
}
|
|
mVelocityTracker.addMovement(ev);
|
|
}
|
|
|
|
private void releaseVelocityTracker() {
|
|
if (mVelocityTracker != null) {
|
|
mVelocityTracker.recycle();
|
|
mVelocityTracker = null;
|
|
}
|
|
}
|
|
|
|
private void onSecondaryPointerUp(MotionEvent ev) {
|
|
final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) >>
|
|
MotionEvent.ACTION_POINTER_INDEX_SHIFT;
|
|
final int pointerId = ev.getPointerId(pointerIndex);
|
|
if (pointerId == mActivePointerId) {
|
|
// This was our active pointer going up. Choose a new
|
|
// active pointer and adjust accordingly.
|
|
// TODO: Make this decision more intelligent.
|
|
final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
|
|
mLastMotionX = mDownMotionX = ev.getX(newPointerIndex);
|
|
mLastMotionY = ev.getY(newPointerIndex);
|
|
mLastMotionXRemainder = 0;
|
|
mActivePointerId = ev.getPointerId(newPointerIndex);
|
|
if (mVelocityTracker != null) {
|
|
mVelocityTracker.clear();
|
|
}
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public void requestChildFocus(View child, View focused) {
|
|
super.requestChildFocus(child, focused);
|
|
int page = indexToPage(indexOfChild(child));
|
|
if (page >= 0 && page != getCurrentPage() && !isInTouchMode()) {
|
|
snapToPage(page);
|
|
}
|
|
}
|
|
|
|
protected int getChildWidth(int index) {
|
|
return getPageAt(index).getMeasuredWidth();
|
|
}
|
|
|
|
int getPageNearestToPoint(float x) {
|
|
int index = 0;
|
|
for (int i = 0; i < getChildCount(); ++i) {
|
|
if (x < getChildAt(i).getRight() - getScrollX()) {
|
|
return index;
|
|
} else {
|
|
index++;
|
|
}
|
|
}
|
|
return Math.min(index, getChildCount() - 1);
|
|
}
|
|
|
|
int getPageNearestToCenterOfScreen() {
|
|
int minDistanceFromScreenCenter = Integer.MAX_VALUE;
|
|
int minDistanceFromScreenCenterIndex = -1;
|
|
int screenCenter = getViewportOffsetX() + getScrollX() + (getViewportWidth() / 2);
|
|
final int childCount = getChildCount();
|
|
for (int i = 0; i < childCount; ++i) {
|
|
View layout = (View) getPageAt(i);
|
|
int childWidth = layout.getMeasuredWidth();
|
|
int halfChildWidth = (childWidth / 2);
|
|
int childCenter = getViewportOffsetX() + getChildOffset(i) + halfChildWidth;
|
|
int distanceFromScreenCenter = Math.abs(childCenter - screenCenter);
|
|
if (distanceFromScreenCenter < minDistanceFromScreenCenter) {
|
|
minDistanceFromScreenCenter = distanceFromScreenCenter;
|
|
minDistanceFromScreenCenterIndex = i;
|
|
}
|
|
}
|
|
return minDistanceFromScreenCenterIndex;
|
|
}
|
|
|
|
protected void snapToDestination() {
|
|
snapToPage(getPageNearestToCenterOfScreen(), PAGE_SNAP_ANIMATION_DURATION);
|
|
}
|
|
|
|
private static class ScrollInterpolator implements Interpolator {
|
|
public ScrollInterpolator() {
|
|
}
|
|
|
|
public float getInterpolation(float t) {
|
|
t -= 1.0f;
|
|
return t*t*t*t*t + 1;
|
|
}
|
|
}
|
|
|
|
// We want the duration of the page snap animation to be influenced by the distance that
|
|
// the screen has to travel, however, we don't want this duration to be effected in a
|
|
// purely linear fashion. Instead, we use this method to moderate the effect that the distance
|
|
// of travel has on the overall snap duration.
|
|
float distanceInfluenceForSnapDuration(float f) {
|
|
f -= 0.5f; // center the values about 0.
|
|
f *= 0.3f * Math.PI / 2.0f;
|
|
return (float) Math.sin(f);
|
|
}
|
|
|
|
protected void snapToPageWithVelocity(int whichPage, int velocity) {
|
|
whichPage = Math.max(0, Math.min(whichPage, getChildCount() - 1));
|
|
int halfScreenSize = getViewportWidth() / 2;
|
|
|
|
if (DEBUG) Log.d(TAG, "snapToPage.getChildOffset(): " + getChildOffset(whichPage));
|
|
if (DEBUG) Log.d(TAG, "snapToPageWithVelocity.getRelativeChildOffset(): "
|
|
+ getViewportWidth() + ", " + getChildWidth(whichPage));
|
|
final int newX = getChildOffset(whichPage) - getRelativeChildOffset(whichPage);
|
|
int delta = newX - mUnboundedScrollX;
|
|
int duration = 0;
|
|
|
|
if (Math.abs(velocity) < mMinFlingVelocity) {
|
|
// If the velocity is low enough, then treat this more as an automatic page advance
|
|
// as opposed to an apparent physical response to flinging
|
|
snapToPage(whichPage, PAGE_SNAP_ANIMATION_DURATION);
|
|
return;
|
|
}
|
|
|
|
// Here we compute a "distance" that will be used in the computation of the overall
|
|
// snap duration. This is a function of the actual distance that needs to be traveled;
|
|
// we keep this value close to half screen size in order to reduce the variance in snap
|
|
// duration as a function of the distance the page needs to travel.
|
|
float distanceRatio = Math.min(1f, 1.0f * Math.abs(delta) / (2 * halfScreenSize));
|
|
float distance = halfScreenSize + halfScreenSize *
|
|
distanceInfluenceForSnapDuration(distanceRatio);
|
|
|
|
velocity = Math.abs(velocity);
|
|
velocity = Math.max(mMinSnapVelocity, velocity);
|
|
|
|
// we want the page's snap velocity to approximately match the velocity at which the
|
|
// user flings, so we scale the duration by a value near to the derivative of the scroll
|
|
// interpolator at zero, ie. 5. We use 4 to make it a little slower.
|
|
duration = 4 * Math.round(1000 * Math.abs(distance / velocity));
|
|
|
|
snapToPage(whichPage, delta, duration);
|
|
}
|
|
|
|
protected void snapToPage(int whichPage) {
|
|
snapToPage(whichPage, PAGE_SNAP_ANIMATION_DURATION);
|
|
}
|
|
|
|
protected void snapToPageImmediately(int whichPage) {
|
|
snapToPage(whichPage, PAGE_SNAP_ANIMATION_DURATION, true);
|
|
}
|
|
|
|
protected void snapToPage(int whichPage, int duration) {
|
|
snapToPage(whichPage, duration, false);
|
|
}
|
|
|
|
protected void snapToPage(int whichPage, int duration, boolean immediate) {
|
|
whichPage = Math.max(0, Math.min(whichPage, getPageCount() - 1));
|
|
|
|
if (DEBUG) Log.d(TAG, "snapToPage.getChildOffset(): " + getChildOffset(whichPage));
|
|
if (DEBUG) Log.d(TAG, "snapToPage.getRelativeChildOffset(): " + getViewportWidth() + ", "
|
|
+ getChildWidth(whichPage));
|
|
int newX = getChildOffset(whichPage) - getRelativeChildOffset(whichPage);
|
|
final int sX = mUnboundedScrollX;
|
|
final int delta = newX - sX;
|
|
snapToPage(whichPage, delta, duration, immediate);
|
|
}
|
|
|
|
protected void snapToPage(int whichPage, int delta, int duration) {
|
|
snapToPage(whichPage, delta, duration, false);
|
|
}
|
|
|
|
protected void snapToPage(int whichPage, int delta, int duration, boolean immediate) {
|
|
mNextPage = whichPage;
|
|
View focusedChild = getFocusedChild();
|
|
if (focusedChild != null && whichPage != mCurrentPage &&
|
|
focusedChild == getPageAt(mCurrentPage)) {
|
|
focusedChild.clearFocus();
|
|
}
|
|
|
|
pageBeginMoving();
|
|
awakenScrollBars(duration);
|
|
if (immediate) {
|
|
duration = 0;
|
|
} else if (duration == 0) {
|
|
duration = Math.abs(delta);
|
|
}
|
|
|
|
if (!mScroller.isFinished()) mScroller.abortAnimation();
|
|
mScroller.startScroll(mUnboundedScrollX, 0, delta, 0, duration);
|
|
|
|
notifyPageSwitchListener();
|
|
|
|
// Trigger a compute() to finish switching pages if necessary
|
|
if (immediate) {
|
|
computeScroll();
|
|
}
|
|
|
|
mForceScreenScrolled = true;
|
|
invalidate();
|
|
}
|
|
|
|
public void scrollLeft() {
|
|
if (mScroller.isFinished()) {
|
|
if (mCurrentPage > 0) snapToPage(mCurrentPage - 1);
|
|
} else {
|
|
if (mNextPage > 0) snapToPage(mNextPage - 1);
|
|
}
|
|
}
|
|
|
|
public void scrollRight() {
|
|
if (mScroller.isFinished()) {
|
|
if (mCurrentPage < getChildCount() -1) snapToPage(mCurrentPage + 1);
|
|
} else {
|
|
if (mNextPage < getChildCount() -1) snapToPage(mNextPage + 1);
|
|
}
|
|
}
|
|
|
|
public int getPageForView(View v) {
|
|
int result = -1;
|
|
if (v != null) {
|
|
ViewParent vp = v.getParent();
|
|
int count = getChildCount();
|
|
for (int i = 0; i < count; i++) {
|
|
if (vp == getPageAt(i)) {
|
|
return i;
|
|
}
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* @return True is long presses are still allowed for the current touch
|
|
*/
|
|
public boolean allowLongPress() {
|
|
return mAllowLongPress;
|
|
}
|
|
|
|
/**
|
|
* Set true to allow long-press events to be triggered, usually checked by
|
|
* {@link Launcher} to accept or block dpad-initiated long-presses.
|
|
*/
|
|
public void setAllowLongPress(boolean allowLongPress) {
|
|
mAllowLongPress = allowLongPress;
|
|
}
|
|
|
|
public static class SavedState extends BaseSavedState {
|
|
int currentPage = -1;
|
|
|
|
SavedState(Parcelable superState) {
|
|
super(superState);
|
|
}
|
|
|
|
private SavedState(Parcel in) {
|
|
super(in);
|
|
currentPage = in.readInt();
|
|
}
|
|
|
|
@Override
|
|
public void writeToParcel(Parcel out, int flags) {
|
|
super.writeToParcel(out, flags);
|
|
out.writeInt(currentPage);
|
|
}
|
|
|
|
public static final Parcelable.Creator<SavedState> CREATOR =
|
|
new Parcelable.Creator<SavedState>() {
|
|
public SavedState createFromParcel(Parcel in) {
|
|
return new SavedState(in);
|
|
}
|
|
|
|
public SavedState[] newArray(int size) {
|
|
return new SavedState[size];
|
|
}
|
|
};
|
|
}
|
|
|
|
protected void loadAssociatedPages(int page) {
|
|
loadAssociatedPages(page, false);
|
|
}
|
|
protected void loadAssociatedPages(int page, boolean immediateAndOnly) {
|
|
if (mContentIsRefreshable) {
|
|
final int count = getChildCount();
|
|
if (page < count) {
|
|
int lowerPageBound = getAssociatedLowerPageBound(page);
|
|
int upperPageBound = getAssociatedUpperPageBound(page);
|
|
if (DEBUG) Log.d(TAG, "loadAssociatedPages: " + lowerPageBound + "/"
|
|
+ upperPageBound);
|
|
// First, clear any pages that should no longer be loaded
|
|
for (int i = 0; i < count; ++i) {
|
|
Page layout = (Page) getPageAt(i);
|
|
if ((i < lowerPageBound) || (i > upperPageBound)) {
|
|
if (layout.getPageChildCount() > 0) {
|
|
layout.removeAllViewsOnPage();
|
|
}
|
|
mDirtyPageContent.set(i, true);
|
|
}
|
|
}
|
|
// Next, load any new pages
|
|
for (int i = 0; i < count; ++i) {
|
|
if ((i != page) && immediateAndOnly) {
|
|
continue;
|
|
}
|
|
if (lowerPageBound <= i && i <= upperPageBound) {
|
|
if (mDirtyPageContent.get(i)) {
|
|
syncPageItems(i, (i == page) && immediateAndOnly);
|
|
mDirtyPageContent.set(i, false);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
protected int getAssociatedLowerPageBound(int page) {
|
|
return Math.max(0, page - 1);
|
|
}
|
|
protected int getAssociatedUpperPageBound(int page) {
|
|
final int count = getChildCount();
|
|
return Math.min(page + 1, count - 1);
|
|
}
|
|
|
|
/**
|
|
* This method is called ONLY to synchronize the number of pages that the paged view has.
|
|
* To actually fill the pages with information, implement syncPageItems() below. It is
|
|
* guaranteed that syncPageItems() will be called for a particular page before it is shown,
|
|
* and therefore, individual page items do not need to be updated in this method.
|
|
*/
|
|
public abstract void syncPages();
|
|
|
|
/**
|
|
* This method is called to synchronize the items that are on a particular page. If views on
|
|
* the page can be reused, then they should be updated within this method.
|
|
*/
|
|
public abstract void syncPageItems(int page, boolean immediate);
|
|
|
|
protected void invalidatePageData() {
|
|
invalidatePageData(-1, false);
|
|
}
|
|
protected void invalidatePageData(int currentPage) {
|
|
invalidatePageData(currentPage, false);
|
|
}
|
|
protected void invalidatePageData(int currentPage, boolean immediateAndOnly) {
|
|
if (!mIsDataReady) {
|
|
return;
|
|
}
|
|
|
|
if (mContentIsRefreshable) {
|
|
// Force all scrolling-related behavior to end
|
|
mScroller.forceFinished(true);
|
|
mNextPage = INVALID_PAGE;
|
|
|
|
// Update all the pages
|
|
syncPages();
|
|
|
|
// We must force a measure after we've loaded the pages to update the content width and
|
|
// to determine the full scroll width
|
|
measure(MeasureSpec.makeMeasureSpec(getMeasuredWidth(), MeasureSpec.EXACTLY),
|
|
MeasureSpec.makeMeasureSpec(getMeasuredHeight(), MeasureSpec.EXACTLY));
|
|
|
|
// Set a new page as the current page if necessary
|
|
if (currentPage > -1) {
|
|
setCurrentPage(Math.min(getPageCount() - 1, currentPage));
|
|
}
|
|
|
|
// Mark each of the pages as dirty
|
|
final int count = getChildCount();
|
|
mDirtyPageContent.clear();
|
|
for (int i = 0; i < count; ++i) {
|
|
mDirtyPageContent.add(true);
|
|
}
|
|
|
|
// Load any pages that are necessary for the current window of views
|
|
loadAssociatedPages(mCurrentPage, immediateAndOnly);
|
|
requestLayout();
|
|
}
|
|
}
|
|
|
|
protected View getScrollingIndicator() {
|
|
// We use mHasScrollIndicator to prevent future lookups if there is no sibling indicator
|
|
// found
|
|
if (mHasScrollIndicator && mScrollIndicator == null) {
|
|
ViewGroup parent = (ViewGroup) getParent();
|
|
if (parent != null) {
|
|
mScrollIndicator = (View) (parent.findViewById(R.id.paged_view_indicator));
|
|
mHasScrollIndicator = mScrollIndicator != null;
|
|
if (mHasScrollIndicator) {
|
|
mScrollIndicator.setVisibility(View.VISIBLE);
|
|
}
|
|
}
|
|
}
|
|
return mScrollIndicator;
|
|
}
|
|
|
|
protected boolean isScrollingIndicatorEnabled() {
|
|
return true;
|
|
}
|
|
|
|
Runnable hideScrollingIndicatorRunnable = new Runnable() {
|
|
@Override
|
|
public void run() {
|
|
hideScrollingIndicator(false);
|
|
}
|
|
};
|
|
|
|
protected void flashScrollingIndicator(boolean animated) {
|
|
removeCallbacks(hideScrollingIndicatorRunnable);
|
|
showScrollingIndicator(!animated);
|
|
postDelayed(hideScrollingIndicatorRunnable, sScrollIndicatorFlashDuration);
|
|
}
|
|
|
|
protected void showScrollingIndicator(boolean immediately) {
|
|
mShouldShowScrollIndicator = true;
|
|
mShouldShowScrollIndicatorImmediately = true;
|
|
if (getChildCount() <= 1) return;
|
|
if (!isScrollingIndicatorEnabled()) return;
|
|
|
|
mShouldShowScrollIndicator = false;
|
|
getScrollingIndicator();
|
|
if (mScrollIndicator != null) {
|
|
// Fade the indicator in
|
|
updateScrollingIndicatorPosition();
|
|
mScrollIndicator.setVisibility(View.VISIBLE);
|
|
cancelScrollingIndicatorAnimations();
|
|
if (immediately) {
|
|
mScrollIndicator.setAlpha(1f);
|
|
} else {
|
|
mScrollIndicatorAnimator = ObjectAnimator.ofFloat(mScrollIndicator, "alpha", 1f);
|
|
mScrollIndicatorAnimator.setDuration(sScrollIndicatorFadeInDuration);
|
|
mScrollIndicatorAnimator.start();
|
|
}
|
|
}
|
|
}
|
|
|
|
protected void cancelScrollingIndicatorAnimations() {
|
|
if (mScrollIndicatorAnimator != null) {
|
|
mScrollIndicatorAnimator.cancel();
|
|
}
|
|
}
|
|
|
|
protected void hideScrollingIndicator(boolean immediately) {
|
|
if (getChildCount() <= 1) return;
|
|
if (!isScrollingIndicatorEnabled()) return;
|
|
|
|
getScrollingIndicator();
|
|
if (mScrollIndicator != null) {
|
|
// Fade the indicator out
|
|
updateScrollingIndicatorPosition();
|
|
cancelScrollingIndicatorAnimations();
|
|
if (immediately) {
|
|
mScrollIndicator.setVisibility(View.INVISIBLE);
|
|
mScrollIndicator.setAlpha(0f);
|
|
} else {
|
|
mScrollIndicatorAnimator = ObjectAnimator.ofFloat(mScrollIndicator, "alpha", 0f);
|
|
mScrollIndicatorAnimator.setDuration(sScrollIndicatorFadeOutDuration);
|
|
mScrollIndicatorAnimator.addListener(new AnimatorListenerAdapter() {
|
|
private boolean cancelled = false;
|
|
@Override
|
|
public void onAnimationCancel(android.animation.Animator animation) {
|
|
cancelled = true;
|
|
}
|
|
@Override
|
|
public void onAnimationEnd(Animator animation) {
|
|
if (!cancelled) {
|
|
mScrollIndicator.setVisibility(View.INVISIBLE);
|
|
}
|
|
}
|
|
});
|
|
mScrollIndicatorAnimator.start();
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* To be overridden by subclasses to determine whether the scroll indicator should stretch to
|
|
* fill its space on the track or not.
|
|
*/
|
|
protected boolean hasElasticScrollIndicator() {
|
|
return true;
|
|
}
|
|
|
|
private void updateScrollingIndicator() {
|
|
if (getChildCount() <= 1) return;
|
|
if (!isScrollingIndicatorEnabled()) return;
|
|
|
|
getScrollingIndicator();
|
|
if (mScrollIndicator != null) {
|
|
updateScrollingIndicatorPosition();
|
|
}
|
|
if (mShouldShowScrollIndicator) {
|
|
showScrollingIndicator(mShouldShowScrollIndicatorImmediately);
|
|
}
|
|
}
|
|
|
|
private void updateScrollingIndicatorPosition() {
|
|
final boolean isRtl = isLayoutRtl();
|
|
if (!isScrollingIndicatorEnabled()) return;
|
|
if (mScrollIndicator == null) return;
|
|
int numPages = getChildCount();
|
|
int pageWidth = getViewportWidth();
|
|
int lastChildIndex = Math.max(0, getChildCount() - 1);
|
|
int maxScrollX = getChildOffset(lastChildIndex) - getRelativeChildOffset(lastChildIndex);
|
|
int trackWidth = pageWidth - mScrollIndicatorPaddingLeft - mScrollIndicatorPaddingRight;
|
|
int indicatorWidth = mScrollIndicator.getMeasuredWidth() -
|
|
mScrollIndicator.getPaddingLeft() - mScrollIndicator.getPaddingRight();
|
|
|
|
float scrollPos = isRtl ? mMaxScrollX - getScrollX() : getScrollX();
|
|
float offset = Math.max(0f, Math.min(1f, (float) scrollPos / mMaxScrollX));
|
|
if (isRtl) {
|
|
offset = 1f - offset;
|
|
}
|
|
int indicatorSpace = trackWidth / numPages;
|
|
int indicatorPos = (int) (offset * (trackWidth - indicatorSpace)) + mScrollIndicatorPaddingLeft;
|
|
if (hasElasticScrollIndicator()) {
|
|
if (mScrollIndicator.getMeasuredWidth() != indicatorSpace) {
|
|
mScrollIndicator.getLayoutParams().width = indicatorSpace;
|
|
mScrollIndicator.requestLayout();
|
|
}
|
|
} else {
|
|
int indicatorCenterOffset = indicatorSpace / 2 - indicatorWidth / 2;
|
|
indicatorPos += indicatorCenterOffset;
|
|
}
|
|
mScrollIndicator.setTranslationX(indicatorPos);
|
|
}
|
|
|
|
// Animate the drag view back to the original position
|
|
void animateDragViewToOriginalPosition() {
|
|
if (mDragView != null) {
|
|
AnimatorSet anim = new AnimatorSet();
|
|
anim.setDuration(REORDERING_DROP_REPOSITION_DURATION);
|
|
anim.playTogether(
|
|
ObjectAnimator.ofFloat(mDragView, "translationX", 0f),
|
|
ObjectAnimator.ofFloat(mDragView, "translationY", 0f));
|
|
anim.addListener(new AnimatorListenerAdapter() {
|
|
@Override
|
|
public void onAnimationEnd(Animator animation) {
|
|
onPostReorderingAnimationCompleted();
|
|
}
|
|
});
|
|
anim.start();
|
|
}
|
|
}
|
|
|
|
// "Zooms out" the PagedView to reveal more side pages
|
|
protected boolean zoomOut() {
|
|
if (mZoomInOutAnim != null && mZoomInOutAnim.isRunning()) {
|
|
mZoomInOutAnim.cancel();
|
|
}
|
|
|
|
if (!(getScaleX() < 1f || getScaleY() < 1f)) {
|
|
mZoomInOutAnim = new AnimatorSet();
|
|
mZoomInOutAnim.setDuration(REORDERING_ZOOM_IN_OUT_DURATION);
|
|
mZoomInOutAnim.playTogether(
|
|
ObjectAnimator.ofFloat(this, "scaleX", mMinScale),
|
|
ObjectAnimator.ofFloat(this, "scaleY", mMinScale));
|
|
mZoomInOutAnim.addListener(new AnimatorListenerAdapter() {
|
|
@Override
|
|
public void onAnimationStart(Animator animation) {
|
|
// Show the delete drop target
|
|
if (mDeleteDropTarget != null) {
|
|
mDeleteDropTarget.setVisibility(View.VISIBLE);
|
|
mDeleteDropTarget.animate().alpha(1f)
|
|
.setDuration(REORDERING_DELETE_DROP_TARGET_FADE_DURATION)
|
|
.setListener(new AnimatorListenerAdapter() {
|
|
@Override
|
|
public void onAnimationStart(Animator animation) {
|
|
mDeleteDropTarget.setAlpha(0f);
|
|
}
|
|
});
|
|
}
|
|
}
|
|
});
|
|
mZoomInOutAnim.start();
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
protected void onStartReordering() {
|
|
// Set the touch state to reordering (allows snapping to pages, dragging a child, etc.)
|
|
mTouchState = TOUCH_STATE_REORDERING;
|
|
mIsReordering = true;
|
|
|
|
// Mark all the non-widget pages as invisible
|
|
getVisiblePages(mTempVisiblePagesRange);
|
|
boundByReorderablePages(true, mTempVisiblePagesRange);
|
|
for (int i = 0; i < getPageCount(); ++i) {
|
|
if (i < mTempVisiblePagesRange[0] || i > mTempVisiblePagesRange[1]) {
|
|
getPageAt(i).setAlpha(0f);
|
|
}
|
|
}
|
|
|
|
// We must invalidate to trigger a redraw to update the layers such that the drag view
|
|
// is always drawn on top
|
|
invalidate();
|
|
}
|
|
|
|
private void onPostReorderingAnimationCompleted() {
|
|
// Trigger the callback when reordering has settled
|
|
--mPostReorderingPreZoomInRemainingAnimationCount;
|
|
if (mPostReorderingPreZoomInRunnable != null &&
|
|
mPostReorderingPreZoomInRemainingAnimationCount == 0) {
|
|
mPostReorderingPreZoomInRunnable.run();
|
|
mPostReorderingPreZoomInRunnable = null;
|
|
}
|
|
}
|
|
|
|
protected void onEndReordering() {
|
|
mIsReordering = false;
|
|
|
|
// Mark all the non-widget pages as visible again
|
|
getVisiblePages(mTempVisiblePagesRange);
|
|
boundByReorderablePages(true, mTempVisiblePagesRange);
|
|
for (int i = 0; i < getPageCount(); ++i) {
|
|
if (i < mTempVisiblePagesRange[0] || i > mTempVisiblePagesRange[1]) {
|
|
getPageAt(i).setAlpha(1f);
|
|
}
|
|
}
|
|
}
|
|
|
|
public boolean startReordering() {
|
|
int dragViewIndex = getPageNearestToCenterOfScreen();
|
|
mTempVisiblePagesRange[0] = 0;
|
|
mTempVisiblePagesRange[1] = getPageCount() - 1;
|
|
boundByReorderablePages(true, mTempVisiblePagesRange);
|
|
mReorderingStarted = true;
|
|
|
|
// Check if we are within the reordering range
|
|
if (mTempVisiblePagesRange[0] <= dragViewIndex &&
|
|
dragViewIndex <= mTempVisiblePagesRange[1]) {
|
|
if (zoomOut()) {
|
|
// Find the drag view under the pointer
|
|
mDragView = getChildAt(dragViewIndex);
|
|
|
|
onStartReordering();
|
|
}
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
boolean isReordering(boolean testTouchState) {
|
|
boolean state = mIsReordering;
|
|
if (testTouchState) {
|
|
state &= (mTouchState == TOUCH_STATE_REORDERING);
|
|
}
|
|
return state;
|
|
}
|
|
void endReordering() {
|
|
// For simplicity, we call endReordering sometimes even if reordering was never started.
|
|
// In that case, we don't want to do anything.
|
|
if (!mReorderingStarted) return;
|
|
mReorderingStarted = false;
|
|
|
|
// If we haven't flung-to-delete the current child, then we just animate the drag view
|
|
// back into position
|
|
final Runnable onCompleteRunnable = new Runnable() {
|
|
@Override
|
|
public void run() {
|
|
onEndReordering();
|
|
}
|
|
};
|
|
if (!mDeferringForDelete) {
|
|
mPostReorderingPreZoomInRunnable = new Runnable() {
|
|
public void run() {
|
|
zoomIn(onCompleteRunnable);
|
|
};
|
|
};
|
|
|
|
mPostReorderingPreZoomInRemainingAnimationCount =
|
|
NUM_ANIMATIONS_RUNNING_BEFORE_ZOOM_OUT;
|
|
// Snap to the current page
|
|
snapToPage(indexOfChild(mDragView), 0);
|
|
// Animate the drag view back to the front position
|
|
animateDragViewToOriginalPosition();
|
|
} else {
|
|
// Handled in post-delete-animation-callbacks
|
|
}
|
|
}
|
|
|
|
// "Zooms in" the PagedView to highlight the current page
|
|
protected boolean zoomIn(final Runnable onCompleteRunnable) {
|
|
if (mZoomInOutAnim != null && mZoomInOutAnim.isRunning()) {
|
|
mZoomInOutAnim.cancel();
|
|
}
|
|
if (getScaleX() < 1f || getScaleY() < 1f) {
|
|
mZoomInOutAnim = new AnimatorSet();
|
|
mZoomInOutAnim.setDuration(REORDERING_ZOOM_IN_OUT_DURATION);
|
|
mZoomInOutAnim.playTogether(
|
|
ObjectAnimator.ofFloat(this, "scaleX", 1f),
|
|
ObjectAnimator.ofFloat(this, "scaleY", 1f));
|
|
mZoomInOutAnim.addListener(new AnimatorListenerAdapter() {
|
|
@Override
|
|
public void onAnimationStart(Animator animation) {
|
|
// Hide the delete drop target
|
|
if (mDeleteDropTarget != null) {
|
|
mDeleteDropTarget.animate().alpha(0f)
|
|
.setDuration(REORDERING_DELETE_DROP_TARGET_FADE_DURATION)
|
|
.setListener(new AnimatorListenerAdapter() {
|
|
@Override
|
|
public void onAnimationEnd(Animator animation) {
|
|
mDeleteDropTarget.setVisibility(View.GONE);
|
|
}
|
|
});
|
|
}
|
|
}
|
|
@Override
|
|
public void onAnimationCancel(Animator animation) {
|
|
mDragView = null;
|
|
}
|
|
@Override
|
|
public void onAnimationEnd(Animator animation) {
|
|
mDragView = null;
|
|
if (onCompleteRunnable != null) {
|
|
onCompleteRunnable.run();
|
|
}
|
|
}
|
|
});
|
|
mZoomInOutAnim.start();
|
|
return true;
|
|
} else {
|
|
if (onCompleteRunnable != null) {
|
|
onCompleteRunnable.run();
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Flinging to delete - IN PROGRESS
|
|
*/
|
|
private PointF isFlingingToDelete() {
|
|
ViewConfiguration config = ViewConfiguration.get(getContext());
|
|
mVelocityTracker.computeCurrentVelocity(1000, config.getScaledMaximumFlingVelocity());
|
|
|
|
if (mVelocityTracker.getYVelocity() < mFlingToDeleteThresholdVelocity) {
|
|
// Do a quick dot product test to ensure that we are flinging upwards
|
|
PointF vel = new PointF(mVelocityTracker.getXVelocity(),
|
|
mVelocityTracker.getYVelocity());
|
|
PointF upVec = new PointF(0f, -1f);
|
|
float theta = (float) Math.acos(((vel.x * upVec.x) + (vel.y * upVec.y)) /
|
|
(vel.length() * upVec.length()));
|
|
if (theta <= Math.toRadians(FLING_TO_DELETE_MAX_FLING_DEGREES)) {
|
|
return vel;
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Creates an animation from the current drag view along its current velocity vector.
|
|
* For this animation, the alpha runs for a fixed duration and we update the position
|
|
* progressively.
|
|
*/
|
|
private static class FlingAlongVectorAnimatorUpdateListener implements AnimatorUpdateListener {
|
|
private View mDragView;
|
|
private PointF mVelocity;
|
|
private Rect mFrom;
|
|
private long mPrevTime;
|
|
private float mFriction;
|
|
|
|
private final TimeInterpolator mAlphaInterpolator = new DecelerateInterpolator(0.75f);
|
|
|
|
public FlingAlongVectorAnimatorUpdateListener(View dragView, PointF vel, Rect from,
|
|
long startTime, float friction) {
|
|
mDragView = dragView;
|
|
mVelocity = vel;
|
|
mFrom = from;
|
|
mPrevTime = startTime;
|
|
mFriction = 1f - (mDragView.getResources().getDisplayMetrics().density * friction);
|
|
}
|
|
|
|
@Override
|
|
public void onAnimationUpdate(ValueAnimator animation) {
|
|
float t = ((Float) animation.getAnimatedValue()).floatValue();
|
|
long curTime = AnimationUtils.currentAnimationTimeMillis();
|
|
|
|
mFrom.left += (mVelocity.x * (curTime - mPrevTime) / 1000f);
|
|
mFrom.top += (mVelocity.y * (curTime - mPrevTime) / 1000f);
|
|
|
|
mDragView.setTranslationX(mFrom.left);
|
|
mDragView.setTranslationY(mFrom.top);
|
|
mDragView.setAlpha(1f - mAlphaInterpolator.getInterpolation(t));
|
|
|
|
mVelocity.x *= mFriction;
|
|
mVelocity.y *= mFriction;
|
|
mPrevTime = curTime;
|
|
}
|
|
};
|
|
|
|
private static final int ANIM_TAG_KEY = 100;
|
|
|
|
private Runnable createPostDeleteAnimationRunnable(final View dragView) {
|
|
return new Runnable() {
|
|
@Override
|
|
public void run() {
|
|
int dragViewIndex = indexOfChild(dragView);
|
|
|
|
// For each of the pages around the drag view, animate them from the previous
|
|
// position to the new position in the layout (as a result of the drag view moving
|
|
// in the layout)
|
|
// NOTE: We can make an assumption here because we have side-bound pages that we
|
|
// will always have pages to animate in from the left
|
|
getVisiblePages(mTempVisiblePagesRange);
|
|
boundByReorderablePages(true, mTempVisiblePagesRange);
|
|
boolean isLastWidgetPage = (mTempVisiblePagesRange[0] == mTempVisiblePagesRange[1]);
|
|
boolean slideFromLeft = (isLastWidgetPage ||
|
|
dragViewIndex > mTempVisiblePagesRange[0]);
|
|
|
|
// Setup the scroll to the correct page before we swap the views
|
|
if (slideFromLeft) {
|
|
snapToPageImmediately(dragViewIndex - 1);
|
|
}
|
|
|
|
int firstIndex = (isLastWidgetPage ? 0 : mTempVisiblePagesRange[0]);
|
|
int lastIndex = Math.min(mTempVisiblePagesRange[1], getPageCount() - 1);
|
|
int lowerIndex = (slideFromLeft ? firstIndex : dragViewIndex + 1 );
|
|
int upperIndex = (slideFromLeft ? dragViewIndex - 1 : lastIndex);
|
|
ArrayList<Animator> animations = new ArrayList<Animator>();
|
|
for (int i = lowerIndex; i <= upperIndex; ++i) {
|
|
View v = getChildAt(i);
|
|
// dragViewIndex < pageUnderPointIndex, so after we remove the
|
|
// drag view all subsequent views to pageUnderPointIndex will
|
|
// shift down.
|
|
int oldX = 0;
|
|
int newX = 0;
|
|
if (slideFromLeft) {
|
|
if (i == 0) {
|
|
// Simulate the page being offscreen with the page spacing
|
|
oldX = getViewportOffsetX() + getChildOffset(i) - getChildWidth(i)
|
|
- mPageSpacing;
|
|
} else {
|
|
oldX = getViewportOffsetX() + getChildOffset(i - 1);
|
|
}
|
|
newX = getViewportOffsetX() + getChildOffset(i);
|
|
} else {
|
|
oldX = getChildOffset(i) - getChildOffset(i - 1);
|
|
newX = 0;
|
|
}
|
|
|
|
// Animate the view translation from its old position to its new
|
|
// position
|
|
AnimatorSet anim = (AnimatorSet) v.getTag();
|
|
if (anim != null) {
|
|
anim.cancel();
|
|
}
|
|
|
|
// Note: Hacky, but we want to skip any optimizations to not draw completely
|
|
// hidden views
|
|
v.setAlpha(Math.max(v.getAlpha(), 0.01f));
|
|
v.setTranslationX(oldX - newX);
|
|
anim = new AnimatorSet();
|
|
anim.playTogether(
|
|
ObjectAnimator.ofFloat(v, "translationX", 0f),
|
|
ObjectAnimator.ofFloat(v, "alpha", 1f));
|
|
animations.add(anim);
|
|
v.setTag(ANIM_TAG_KEY, anim);
|
|
}
|
|
|
|
AnimatorSet slideAnimations = new AnimatorSet();
|
|
slideAnimations.playTogether(animations);
|
|
slideAnimations.setDuration(DELETE_SLIDE_IN_SIDE_PAGE_DURATION);
|
|
slideAnimations.addListener(new AnimatorListenerAdapter() {
|
|
@Override
|
|
public void onAnimationEnd(Animator animation) {
|
|
final Runnable onCompleteRunnable = new Runnable() {
|
|
@Override
|
|
public void run() {
|
|
mDeferringForDelete = false;
|
|
onEndReordering();
|
|
onRemoveViewAnimationCompleted();
|
|
}
|
|
};
|
|
zoomIn(onCompleteRunnable);
|
|
}
|
|
});
|
|
slideAnimations.start();
|
|
|
|
removeView(dragView);
|
|
onRemoveView(dragView, true);
|
|
}
|
|
};
|
|
}
|
|
|
|
public void onFlingToDelete(PointF vel) {
|
|
final long startTime = AnimationUtils.currentAnimationTimeMillis();
|
|
|
|
// NOTE: Because it takes time for the first frame of animation to actually be
|
|
// called and we expect the animation to be a continuation of the fling, we have
|
|
// to account for the time that has elapsed since the fling finished. And since
|
|
// we don't have a startDelay, we will always get call to update when we call
|
|
// start() (which we want to ignore).
|
|
final TimeInterpolator tInterpolator = new TimeInterpolator() {
|
|
private int mCount = -1;
|
|
private long mStartTime;
|
|
private float mOffset;
|
|
/* Anonymous inner class ctor */ {
|
|
mStartTime = startTime;
|
|
}
|
|
|
|
@Override
|
|
public float getInterpolation(float t) {
|
|
if (mCount < 0) {
|
|
mCount++;
|
|
} else if (mCount == 0) {
|
|
mOffset = Math.min(0.5f, (float) (AnimationUtils.currentAnimationTimeMillis() -
|
|
mStartTime) / FLING_TO_DELETE_FADE_OUT_DURATION);
|
|
mCount++;
|
|
}
|
|
return Math.min(1f, mOffset + t);
|
|
}
|
|
};
|
|
|
|
final Rect from = new Rect();
|
|
final View dragView = mDragView;
|
|
from.left = (int) dragView.getTranslationX();
|
|
from.top = (int) dragView.getTranslationY();
|
|
AnimatorUpdateListener updateCb = new FlingAlongVectorAnimatorUpdateListener(dragView, vel,
|
|
from, startTime, FLING_TO_DELETE_FRICTION);
|
|
|
|
final Runnable onAnimationEndRunnable = createPostDeleteAnimationRunnable(dragView);
|
|
|
|
// Create and start the animation
|
|
ValueAnimator mDropAnim = new ValueAnimator();
|
|
mDropAnim.setInterpolator(tInterpolator);
|
|
mDropAnim.setDuration(FLING_TO_DELETE_FADE_OUT_DURATION);
|
|
mDropAnim.setFloatValues(0f, 1f);
|
|
mDropAnim.addUpdateListener(updateCb);
|
|
mDropAnim.addListener(new AnimatorListenerAdapter() {
|
|
public void onAnimationEnd(Animator animation) {
|
|
onAnimationEndRunnable.run();
|
|
}
|
|
});
|
|
mDropAnim.start();
|
|
mDeferringForDelete = true;
|
|
}
|
|
|
|
/* Drag to delete */
|
|
private boolean isHoveringOverDeleteDropTarget(int x, int y) {
|
|
if (mDeleteDropTarget != null) {
|
|
mAltTmpRect.set(0, 0, 0, 0);
|
|
View parent = (View) mDeleteDropTarget.getParent();
|
|
if (parent != null) {
|
|
parent.getGlobalVisibleRect(mAltTmpRect);
|
|
}
|
|
mDeleteDropTarget.getGlobalVisibleRect(mTmpRect);
|
|
mTmpRect.offset(-mAltTmpRect.left, -mAltTmpRect.top);
|
|
return mTmpRect.contains(x, y);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
protected void setPageHoveringOverDeleteDropTarget(int viewIndex, boolean isHovering) {}
|
|
|
|
private void onDropToDelete() {
|
|
final View dragView = mDragView;
|
|
|
|
final float toScale = 0f;
|
|
final float toAlpha = 0f;
|
|
|
|
// Create and start the complex animation
|
|
ArrayList<Animator> animations = new ArrayList<Animator>();
|
|
AnimatorSet motionAnim = new AnimatorSet();
|
|
motionAnim.setInterpolator(new DecelerateInterpolator(2));
|
|
motionAnim.playTogether(
|
|
ObjectAnimator.ofFloat(dragView, "scaleX", toScale),
|
|
ObjectAnimator.ofFloat(dragView, "scaleY", toScale));
|
|
animations.add(motionAnim);
|
|
|
|
AnimatorSet alphaAnim = new AnimatorSet();
|
|
alphaAnim.setInterpolator(new LinearInterpolator());
|
|
alphaAnim.playTogether(
|
|
ObjectAnimator.ofFloat(dragView, "alpha", toAlpha));
|
|
animations.add(alphaAnim);
|
|
|
|
final Runnable onAnimationEndRunnable = createPostDeleteAnimationRunnable(dragView);
|
|
|
|
AnimatorSet anim = new AnimatorSet();
|
|
anim.playTogether(animations);
|
|
anim.setDuration(DRAG_TO_DELETE_FADE_OUT_DURATION);
|
|
anim.addListener(new AnimatorListenerAdapter() {
|
|
public void onAnimationEnd(Animator animation) {
|
|
onAnimationEndRunnable.run();
|
|
}
|
|
});
|
|
anim.start();
|
|
|
|
mDeferringForDelete = true;
|
|
}
|
|
|
|
/* Accessibility */
|
|
@Override
|
|
public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
|
|
super.onInitializeAccessibilityNodeInfo(info);
|
|
info.setScrollable(getPageCount() > 1);
|
|
if (getCurrentPage() < getPageCount() - 1) {
|
|
info.addAction(AccessibilityNodeInfo.ACTION_SCROLL_FORWARD);
|
|
}
|
|
if (getCurrentPage() > 0) {
|
|
info.addAction(AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD);
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
|
|
super.onInitializeAccessibilityEvent(event);
|
|
event.setScrollable(true);
|
|
if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_SCROLLED) {
|
|
event.setFromIndex(mCurrentPage);
|
|
event.setToIndex(mCurrentPage);
|
|
event.setItemCount(getChildCount());
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public boolean performAccessibilityAction(int action, Bundle arguments) {
|
|
if (super.performAccessibilityAction(action, arguments)) {
|
|
return true;
|
|
}
|
|
switch (action) {
|
|
case AccessibilityNodeInfo.ACTION_SCROLL_FORWARD: {
|
|
if (getCurrentPage() < getPageCount() - 1) {
|
|
scrollRight();
|
|
return true;
|
|
}
|
|
} break;
|
|
case AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD: {
|
|
if (getCurrentPage() > 0) {
|
|
scrollLeft();
|
|
return true;
|
|
}
|
|
} break;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
protected String getCurrentPageDescription() {
|
|
return String.format(getContext().getString(R.string.default_scroll_format),
|
|
getNextPage() + 1, getChildCount());
|
|
}
|
|
|
|
@Override
|
|
public boolean onHoverEvent(android.view.MotionEvent event) {
|
|
return true;
|
|
}
|
|
}
|