change package name to uiuios

src/com/android/uiuios/accessibility/DragAndDropAccessibilityDelegate.java

@@ -0,0 +1,137 @@
+/*
+ * 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.uiuios.accessibility;
+
+import android.content.Context;
+import android.graphics.Rect;
+import android.os.Bundle;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.view.accessibility.AccessibilityEvent;
+
+import com.android.uiuios.CellLayout;
+import com.android.uiuios.Launcher;
+import com.android.uiuios.R;
+
+import java.util.List;
+
+import androidx.core.view.accessibility.AccessibilityNodeInfoCompat;
+import androidx.customview.widget.ExploreByTouchHelper;
+
+/**
+ * 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 = Launcher.getLauncher(mContext).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;
+    }
+}