1 files changed, 106 insertions, 0 deletions
diff --git a/java/com/android/dialer/app/list/DragDropController.java b/java/com/android/dialer/app/list/DragDropController.java
new file mode 100644
index 000000000..c22dd1318
--- /dev/null
+++ b/java/com/android/dialer/app/list/DragDropController.java
@@ -0,0 +1,106 @@
+/*
+ * Copyright (C) 2016 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.dialer.app.list;
+
+import android.os.Build.VERSION;
+import android.os.Build.VERSION_CODES;
+import android.view.View;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Class that handles and combines drag events generated from multiple views, and then fires off
+ * events to any OnDragDropListeners that have registered for callbacks.
+ */
+public class DragDropController {
+
+  private final List<OnDragDropListener> mOnDragDropListeners = new ArrayList<OnDragDropListener>();
+  private final DragItemContainer mDragItemContainer;
+  private final int[] mLocationOnScreen = new int[2];
+
+  public DragDropController(DragItemContainer dragItemContainer) {
+    mDragItemContainer = dragItemContainer;
+  }
+
+  /** @return True if the drag is started, false if the drag is cancelled for some reason. */
+  boolean handleDragStarted(View v, int x, int y) {
+    int screenX = x;
+    int screenY = y;
+    // The coordinates in dragEvent of DragEvent.ACTION_DRAG_STARTED before NYC is window-related.
+    // This is fixed in NYC.
+    if (VERSION.SDK_INT >= VERSION_CODES.N) {
+      v.getLocationOnScreen(mLocationOnScreen);
+      screenX = x + mLocationOnScreen[0];
+      screenY = y + mLocationOnScreen[1];
+    }
+    final PhoneFavoriteSquareTileView tileView =
+        mDragItemContainer.getViewForLocation(screenX, screenY);
+    if (tileView == null) {
+      return false;
+    }
+    for (int i = 0; i < mOnDragDropListeners.size(); i++) {
+      mOnDragDropListeners.get(i).onDragStarted(screenX, screenY, tileView);
+    }
+
+    return true;
+  }
+
+  public void handleDragHovered(View v, int x, int y) {
+    v.getLocationOnScreen(mLocationOnScreen);
+    final int screenX = x + mLocationOnScreen[0];
+    final int screenY = y + mLocationOnScreen[1];
+    final PhoneFavoriteSquareTileView view =
+        mDragItemContainer.getViewForLocation(screenX, screenY);
+    for (int i = 0; i < mOnDragDropListeners.size(); i++) {
+      mOnDragDropListeners.get(i).onDragHovered(screenX, screenY, view);
+    }
+  }
+
+  public void handleDragFinished(int x, int y, boolean isRemoveView) {
+    if (isRemoveView) {
+      for (int i = 0; i < mOnDragDropListeners.size(); i++) {
+        mOnDragDropListeners.get(i).onDroppedOnRemove();
+      }
+    }
+
+    for (int i = 0; i < mOnDragDropListeners.size(); i++) {
+      mOnDragDropListeners.get(i).onDragFinished(x, y);
+    }
+  }
+
+  public void addOnDragDropListener(OnDragDropListener listener) {
+    if (!mOnDragDropListeners.contains(listener)) {
+      mOnDragDropListeners.add(listener);
+    }
+  }
+
+  public void removeOnDragDropListener(OnDragDropListener listener) {
+    if (mOnDragDropListeners.contains(listener)) {
+      mOnDragDropListeners.remove(listener);
+    }
+  }
+
+  /**
+   * Callback interface used to retrieve views based on the current touch coordinates of the drag
+   * event. The {@link DragItemContainer} houses the draggable views that this {@link
+   * DragDropController} controls.
+   */
+  public interface DragItemContainer {
+
+    PhoneFavoriteSquareTileView getViewForLocation(int x, int y);
+  }
+}