Add vertical layout support for Overview in portrait

WM is making changes which allows apps to maintain
their orientation independent of the orientation of
the foreground app. This allows recents to always start
in portrait even when the app currently running is in
landscape. This means we have to give the illusion of
a landscape oriented overview when user swipes up in
gesterual nav when launcher is started in portrait
configuration.

PagedOrientationHandler abstracts all coordinate specific
logic from Paged/RecentsView primarily, but also all
other dynamic calculations throughout launcher.
PagedViewOrientationState is the single point of exposure
to other classes that depend on those changes. The goal
is to also minimize holding state to allow for default
implementations of PagedOrientationHandler for all the
3p/Fallback classes. PagedViewOrientationState also
holds other data around rotation that isn't
specifically tied to view logic.

The fake landscape overview can be toggled with:
adb shell settings put global forced_rotation [0/1]

Fixes: 146176182
Change-Id: I65d8d4e9f92b93931cbe0053ccaf0cda8d2ffd6c

src/com/android/launcher3/touch/PortraitPagedViewHandler.java

@@ -0,0 +1,257 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.launcher3.touch;
+
+import android.content.res.Resources;
+import android.graphics.Rect;
+import android.graphics.RectF;
+import android.util.FloatProperty;
+import android.view.MotionEvent;
+import android.view.VelocityTracker;
+import android.view.View;
+import android.view.accessibility.AccessibilityEvent;
+
+import com.android.launcher3.DeviceProfile;
+import com.android.launcher3.LauncherState.ScaleAndTranslation;
+import com.android.launcher3.PagedView;
+import com.android.launcher3.Utilities;
+import com.android.launcher3.util.OverScroller;
+
+import static com.android.launcher3.LauncherAnimUtils.VIEW_TRANSLATE_X;
+import static com.android.launcher3.LauncherAnimUtils.VIEW_TRANSLATE_Y;
+import static com.android.launcher3.touch.SingleAxisSwipeDetector.VERTICAL;
+
+public class PortraitPagedViewHandler implements PagedOrientationHandler {
+
+    @Override
+    public float getCurrentAppAnimationScale(RectF src, RectF target) {
+        return src.width() / target.width();
+    }
+
+    @Override
+    public int getPrimaryValue(int x, int y) {
+        return x;
+    }
+
+    @Override
+    public int getSecondaryValue(int x, int y) {
+        return y;
+    }
+
+    @Override
+    public void delegateScrollTo(PagedView pagedView, int secondaryScroll, int primaryScroll) {
+        pagedView.superScrollTo(primaryScroll, secondaryScroll);
+    }
+
+    @Override
+    public void delegateScrollBy(PagedView pagedView, int unboundedScroll, int x, int y) {
+        pagedView.scrollTo(unboundedScroll + x, pagedView.getScrollY() + y);
+    }
+
+    @Override
+    public void scrollerStartScroll(OverScroller scroller, int newPosition) {
+        scroller.startScroll(newPosition - scroller.getCurrPos(), scroller.getCurrPos());
+    }
+
+    @Override
+    public CurveProperties getCurveProperties(PagedView pagedView, Rect mInsets) {
+        int scroll = pagedView.getScrollX();
+        final int halfPageSize = pagedView.getNormalChildWidth() / 2;
+        final int screenCenter = mInsets.left + pagedView.getPaddingLeft() + scroll + halfPageSize;
+        final int halfScreenSize = pagedView.getMeasuredWidth() / 2;
+        return new CurveProperties(scroll, halfPageSize, screenCenter, halfScreenSize);
+    }
+
+    @Override
+    public float getDragLengthFactor(int dimension, int transitionDragLength) {
+        return (float) dimension / transitionDragLength;
+    }
+
+    @Override
+    public boolean isGoingUp(float displacement) {
+        return displacement < 0;
+    }
+
+    @Override
+    public void delegateScrollTo(PagedView pagedView, int primaryScroll) {
+        pagedView.superScrollTo(primaryScroll, pagedView.getScrollY());
+    }
+
+    @Override
+    public <T> void set(T target, Int2DAction<T> action, int param) {
+        action.call(target, param, 0);
+    }
+
+    @Override
+    public <T> void set(T target, Float2DAction<T> action, float param) {
+        action.call(target, param, 0);
+    }
+
+    @Override
+    public float getPrimaryDirection(MotionEvent event, int pointerIndex) {
+        return event.getX(pointerIndex);
+    }
+
+    @Override
+    public float getPrimaryVelocity(VelocityTracker velocityTracker, int pointerId) {
+        return velocityTracker.getXVelocity(pointerId);
+    }
+
+    @Override
+    public int getMeasuredSize(View view) {
+        return view.getMeasuredWidth();
+    }
+
+    @Override
+    public int getPrimarySize(Rect rect) {
+        return rect.width();
+    }
+
+    @Override
+    public float getPrimarySize(RectF rect) {
+        return rect.width();
+    }
+
+    @Override
+    public int getSecondaryDimension(View view) {
+        return view.getHeight();
+    }
+
+    @Override
+    public ScaleAndTranslation getScaleAndTranslation(DeviceProfile dp, View view) {
+        float offscreenTranslationX = dp.widthPx - view.getPaddingStart();
+        return new ScaleAndTranslation(1f, offscreenTranslationX, 0f);
+    }
+
+    @Override
+    public float getTranslationValue(ScaleAndTranslation scaleAndTranslation) {
+        return scaleAndTranslation.translationX;
+    }
+
+    @Override
+    public FloatProperty<View> getPrimaryViewTranslate() {
+        return VIEW_TRANSLATE_X;
+    }
+
+    @Override
+    public FloatProperty<View> getSecondaryViewTranslate() {
+        return VIEW_TRANSLATE_Y;
+    }
+
+    @Override
+    public void setPrimaryAndResetSecondaryTranslate(View view, float translation) {
+        view.setTranslationX(translation);
+        view.setTranslationY(0);
+    }
+
+    @Override
+    public float getViewCenterPosition(View view) {
+        return view.getLeft() + view.getTranslationX();
+    }
+
+    @Override
+    public int getPrimaryScroll(View view) {
+        return view.getScrollX();
+    }
+
+    @Override
+    public float getPrimaryScale(View view) {
+        return view.getScaleX();
+    }
+
+    @Override
+    public void setMaxScroll(AccessibilityEvent event, int maxScroll) {
+        event.setMaxScrollX(maxScroll);
+    }
+
+    @Override
+    public boolean getRecentsRtlSetting(Resources resources) {
+        return !Utilities.isRtl(resources);
+    }
+
+    @Override
+    public float getDegreesRotated() {
+        return 0;
+    }
+
+    @Override
+    public void offsetTaskRect(RectF rect, float value, int delta) {
+        if (delta == 0) {
+            rect.offset(value, 0);
+        } else if (delta == 1) {
+            rect.offset(0, -value);
+        } else if (delta == 2) {
+            rect.offset(-value, 0);
+        } else {
+            rect.offset(0, value);
+        }
+    }
+
+    @Override
+    public void mapRectFromNormalOrientation(Rect src, int screenWidth, int screenHeight) {
+        //no-op
+    }
+
+    @Override
+    public int getChildStart(View view) {
+        return view.getLeft();
+    }
+
+    @Override
+    public int getCenterForPage(View view, Rect insets) {
+        return (view.getPaddingTop() + view.getMeasuredHeight() + insets.top
+            - insets.bottom - view.getPaddingBottom()) / 2;
+    }
+
+    @Override
+    public int getScrollOffsetStart(View view, Rect insets) {
+        return insets.left + view.getPaddingLeft();
+    }
+
+    @Override
+    public int getScrollOffsetEnd(View view, Rect insets) {
+        return view.getWidth() - view.getPaddingRight() - insets.right;
+    }
+
+    @Override
+    public SingleAxisSwipeDetector.Direction getOppositeSwipeDirection() {
+        return VERTICAL;
+    }
+
+    @Override
+    public int getShortEdgeLength(DeviceProfile dp) {
+        return dp.widthPx;
+    }
+
+    @Override
+    public int getTaskDismissDirectionFactor() {
+        return -1;
+    }
+
+    @Override
+    public ChildBounds getChildBounds(View child, int childStart, int pageCenter,
+        boolean layoutChild) {
+        final int childWidth = child.getMeasuredWidth();
+        final int childRight = childStart + childWidth;
+        final int childHeight = child.getMeasuredHeight();
+        final int childTop = pageCenter - childHeight / 2;
+        if (layoutChild) {
+            child.layout(childStart, childTop, childRight, childTop + childHeight);
+        }
+        return new ChildBounds(childWidth, childHeight, childRight, childTop);
+    }
+}