Launcher2 is now Launcher3.

Changes include
  - moving from com.android.launcher{,2} to
    com.android.launcher3
  - removing wallpapers
  - new temporary icon

Change-Id: I1eabd06059e94a8f3bdf6b620777bd1d2b7c212b

src/com/android/launcher3/DropTarget.java

@@ -0,0 +1,184 @@
+/*
+ * Copyright (C) 2008 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;
+
+import android.content.Context;
+import android.graphics.PointF;
+import android.graphics.Rect;
+import android.util.Log;
+
+/**
+ * Interface defining an object that can receive a drag.
+ *
+ */
+public interface DropTarget {
+
+    public static final String TAG = "DropTarget";
+
+    class DragObject {
+        public int x = -1;
+        public int y = -1;
+
+        /** X offset from the upper-left corner of the cell to where we touched.  */
+        public int xOffset = -1;
+
+        /** Y offset from the upper-left corner of the cell to where we touched.  */
+        public int yOffset = -1;
+
+        /** This indicates whether a drag is in final stages, either drop or cancel. It
+         * differentiates onDragExit, since this is called when the drag is ending, above
+         * the current drag target, or when the drag moves off the current drag object.
+         */
+        public boolean dragComplete = false;
+
+        /** The view that moves around while you drag.  */
+        public DragView dragView = null;
+
+        /** The data associated with the object being dragged */
+        public Object dragInfo = null;
+
+        /** Where the drag originated */
+        public DragSource dragSource = null;
+
+        /** Post drag animation runnable */
+        public Runnable postAnimationRunnable = null;
+
+        /** Indicates that the drag operation was cancelled */
+        public boolean cancelled = false;
+
+        /** Defers removing the DragView from the DragLayer until after the drop animation. */
+        public boolean deferDragViewCleanupPostAnimation = true;
+
+        public DragObject() {
+        }
+    }
+
+    public static class DragEnforcer implements DragController.DragListener {
+        int dragParity = 0;
+
+        public DragEnforcer(Context context) {
+            Launcher launcher = (Launcher) context;
+            launcher.getDragController().addDragListener(this);
+        }
+
+        void onDragEnter() {
+            dragParity++;
+            if (dragParity != 1) {
+                Log.e(TAG, "onDragEnter: Drag contract violated: " + dragParity);
+            }
+        }
+
+        void onDragExit() {
+            dragParity--;
+            if (dragParity != 0) {
+                Log.e(TAG, "onDragExit: Drag contract violated: " + dragParity);
+            }
+        }
+
+        @Override
+        public void onDragStart(DragSource source, Object info, int dragAction) {
+            if (dragParity != 0) {
+                Log.e(TAG, "onDragEnter: Drag contract violated: " + dragParity);
+            }
+        }
+
+        @Override
+        public void onDragEnd() {
+            if (dragParity != 0) {
+                Log.e(TAG, "onDragExit: Drag contract violated: " + dragParity);
+            }
+        }
+    }
+
+    /**
+     * Used to temporarily disable certain drop targets
+     *
+     * @return boolean specifying whether this drop target is currently enabled
+     */
+    boolean isDropEnabled();
+
+    /**
+     * Handle an object being dropped on the DropTarget
+     * 
+     * @param source DragSource where the drag started
+     * @param x X coordinate of the drop location
+     * @param y Y coordinate of the drop location
+     * @param xOffset Horizontal offset with the object being dragged where the original
+     *          touch happened
+     * @param yOffset Vertical offset with the object being dragged where the original
+     *          touch happened
+     * @param dragView The DragView that's being dragged around on screen.
+     * @param dragInfo Data associated with the object being dragged
+     * 
+     */
+    void onDrop(DragObject dragObject);
+
+    void onDragEnter(DragObject dragObject);
+
+    void onDragOver(DragObject dragObject);
+
+    void onDragExit(DragObject dragObject);
+
+    /**
+     * Handle an object being dropped as a result of flinging to delete and will be called in place
+     * of onDrop().  (This is only called on objects that are set as the DragController's
+     * fling-to-delete target.
+     */
+    void onFlingToDelete(DragObject dragObject, int x, int y, PointF vec);
+
+    /**
+     * Allows a DropTarget to delegate drag and drop events to another object.
+     *
+     * Most subclasses will should just return null from this method.
+     *
+     * @param source DragSource where the drag started
+     * @param x X coordinate of the drop location
+     * @param y Y coordinate of the drop location
+     * @param xOffset Horizontal offset with the object being dragged where the original
+     *          touch happened
+     * @param yOffset Vertical offset with the object being dragged where the original
+     *          touch happened
+     * @param dragView The DragView that's being dragged around on screen.
+     * @param dragInfo Data associated with the object being dragged
+     *
+     * @return The DropTarget to delegate to, or null to not delegate to another object.
+     */
+    DropTarget getDropTargetDelegate(DragObject dragObject);
+
+    /**
+     * Check if a drop action can occur at, or near, the requested location.
+     * This will be called just before onDrop.
+     * 
+     * @param source DragSource where the drag started
+     * @param x X coordinate of the drop location
+     * @param y Y coordinate of the drop location
+     * @param xOffset Horizontal offset with the object being dragged where the
+     *            original touch happened
+     * @param yOffset Vertical offset with the object being dragged where the
+     *            original touch happened
+     * @param dragView The DragView that's being dragged around on screen.
+     * @param dragInfo Data associated with the object being dragged
+     * @return True if the drop will be accepted, false otherwise.
+     */
+    boolean acceptDrop(DragObject dragObject);
+
+    // These methods are implemented in Views
+    void getHitRect(Rect outRect);
+    void getLocationInDragLayer(int[] loc);
+    int getLeft();
+    int getTop();
+}