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-rw-r--r--src/com/android/launcher3/accessibility/DragAndDropAccessibilityDelegate.java136
1 files changed, 136 insertions, 0 deletions
diff --git a/src/com/android/launcher3/accessibility/DragAndDropAccessibilityDelegate.java b/src/com/android/launcher3/accessibility/DragAndDropAccessibilityDelegate.java
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+++ b/src/com/android/launcher3/accessibility/DragAndDropAccessibilityDelegate.java
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+/*
+ * Copyright (C) 2015 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.accessibility;
+
+import android.content.Context;
+import android.graphics.Rect;
+import android.os.Bundle;
+import android.support.v4.view.accessibility.AccessibilityNodeInfoCompat;
+import android.support.v4.widget.ExploreByTouchHelper;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.view.accessibility.AccessibilityEvent;
+
+import com.android.launcher3.CellLayout;
+import com.android.launcher3.LauncherAppState;
+import com.android.launcher3.R;
+
+import java.util.List;
+
+/**
+ * Helper class to make drag-and-drop in a {@link CellLayout} accessible.
+ */
+public abstract class DragAndDropAccessibilityDelegate extends ExploreByTouchHelper
+ implements OnClickListener {
+ protected static final int INVALID_POSITION = -1;
+
+ private static final int[] sTempArray = new int[2];
+
+ protected final CellLayout mView;
+ protected final Context mContext;
+ protected final LauncherAccessibilityDelegate mDelegate;
+
+ private final Rect mTempRect = new Rect();
+
+ public DragAndDropAccessibilityDelegate(CellLayout forView) {
+ super(forView);
+ mView = forView;
+ mContext = mView.getContext();
+ mDelegate = LauncherAppState.getInstance().getAccessibilityDelegate();
+ }
+
+ @Override
+ protected int getVirtualViewAt(float x, float y) {
+ if (x < 0 || y < 0 || x > mView.getMeasuredWidth() || y > mView.getMeasuredHeight()) {
+ return INVALID_ID;
+ }
+ mView.pointToCellExact((int) x, (int) y, sTempArray);
+
+ // Map cell to id
+ int id = sTempArray[0] + sTempArray[1] * mView.getCountX();
+ return intersectsValidDropTarget(id);
+ }
+
+ /**
+ * @return the view id of the top left corner of a valid drop region or
+ * {@link #INVALID_POSITION} if there is no such valid region.
+ */
+ protected abstract int intersectsValidDropTarget(int id);
+
+ @Override
+ protected void getVisibleVirtualViews(List<Integer> virtualViews) {
+ // We create a virtual view for each cell of the grid
+ // The cell ids correspond to cells in reading order.
+ int nCells = mView.getCountX() * mView.getCountY();
+
+ for (int i = 0; i < nCells; i++) {
+ if (intersectsValidDropTarget(i) == i) {
+ virtualViews.add(i);
+ }
+ }
+ }
+
+ @Override
+ protected boolean onPerformActionForVirtualView(int viewId, int action, Bundle args) {
+ if (action == AccessibilityNodeInfoCompat.ACTION_CLICK && viewId != INVALID_ID) {
+ String confirmation = getConfirmationForIconDrop(viewId);
+ mDelegate.handleAccessibleDrop(mView, getItemBounds(viewId), confirmation);
+ return true;
+ }
+ return false;
+ }
+
+ @Override
+ public void onClick(View v) {
+ onPerformActionForVirtualView(getFocusedVirtualView(),
+ AccessibilityNodeInfoCompat.ACTION_CLICK, null);
+ }
+
+ @Override
+ protected void onPopulateEventForVirtualView(int id, AccessibilityEvent event) {
+ if (id == INVALID_ID) {
+ throw new IllegalArgumentException("Invalid virtual view id");
+ }
+ event.setContentDescription(mContext.getString(R.string.action_move_here));
+ }
+
+ @Override
+ protected void onPopulateNodeForVirtualView(int id, AccessibilityNodeInfoCompat node) {
+ if (id == INVALID_ID) {
+ throw new IllegalArgumentException("Invalid virtual view id");
+ }
+
+ node.setContentDescription(getLocationDescriptionForIconDrop(id));
+ node.setBoundsInParent(getItemBounds(id));
+
+ node.addAction(AccessibilityNodeInfoCompat.ACTION_CLICK);
+ node.setClickable(true);
+ node.setFocusable(true);
+ }
+
+ protected abstract String getLocationDescriptionForIconDrop(int id);
+
+ protected abstract String getConfirmationForIconDrop(int id);
+
+ private Rect getItemBounds(int id) {
+ int cellX = id % mView.getCountX();
+ int cellY = id / mView.getCountX();
+ LauncherAccessibilityDelegate.DragInfo dragInfo = mDelegate.getDragInfo();
+ mView.cellToRect(cellX, cellY, dragInfo.info.spanX, dragInfo.info.spanY, mTempRect);
+ return mTempRect;
+ }
+} \ No newline at end of file