Accessibility: Page re-ordering in overview mode

Change-Id: I5fc0ad326a63b6768cb1fae55ee6e05a9fc2b659

1 files changed, 92 insertions, 0 deletions

diff --git a/src/com/android/launcher3/accessibility/OverviewScreenAccessibilityDelegate.java b/src/com/android/launcher3/accessibility/OverviewScreenAccessibilityDelegate.java
new file mode 100644
index 000000000..d3f5230b2
--- /dev/null
+++ b/src/com/android/launcher3/accessibility/OverviewScreenAccessibilityDelegate.java
@@ -0,0 +1,92 @@
+/*
+ * 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.os.Bundle;
+import android.util.SparseArray;
+import android.view.View;
+import android.view.View.AccessibilityDelegate;
+import android.view.accessibility.AccessibilityNodeInfo;
+import android.view.accessibility.AccessibilityNodeInfo.AccessibilityAction;
+
+import com.android.launcher3.R;
+import com.android.launcher3.Workspace;
+
+public class OverviewScreenAccessibilityDelegate extends AccessibilityDelegate {
+
+    private static final int MOVE_BACKWARD = R.id.action_move_screen_backwards;
+    private static final int MOVE_FORWARD = R.id.action_move_screen_forwards;
+
+    private final SparseArray<AccessibilityAction> mActions = new SparseArray<>();
+    private final Workspace mWorkspace;
+
+    public OverviewScreenAccessibilityDelegate(Workspace workspace) {
+        mWorkspace = workspace;
+
+        Context context = mWorkspace.getContext();
+        boolean isRtl = mWorkspace.isLayoutRtl();
+        mActions.put(MOVE_BACKWARD, new AccessibilityAction(MOVE_BACKWARD,
+                context.getText(isRtl ? R.string.action_move_screen_right :
+                    R.string.action_move_screen_left)));
+        mActions.put(MOVE_FORWARD, new AccessibilityAction(MOVE_FORWARD,
+                context.getText(isRtl ? R.string.action_move_screen_left :
+                    R.string.action_move_screen_right)));
+    }
+
+    @Override
+    public boolean performAccessibilityAction(View host, int action, Bundle args) {
+        if (host != null) {
+            if (action == AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS ) {
+                int index = mWorkspace.indexOfChild(host);
+                mWorkspace.setCurrentPage(index);
+            } else if (action == MOVE_FORWARD) {
+                movePage(mWorkspace.indexOfChild(host) + 1, host);
+                return true;
+            } else if (action == MOVE_BACKWARD) {
+                movePage(mWorkspace.indexOfChild(host) - 1, host);
+                return true;
+            }
+        }
+
+        return super.performAccessibilityAction(host, action, args);
+    }
+
+    private void movePage(int finalIndex, View view) {
+        mWorkspace.onStartReordering();
+        mWorkspace.removeView(view);
+        mWorkspace.addView(view, finalIndex);
+        mWorkspace.onEndReordering();
+        mWorkspace.announceForAccessibility(mWorkspace.getContext().getText(R.string.screen_moved));
+
+        mWorkspace.updateAccessibilityFlags();
+        view.performAccessibilityAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS, null);
+    }
+
+    @Override
+    public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) {
+        super.onInitializeAccessibilityNodeInfo(host, info);
+
+        int index = mWorkspace.indexOfChild(host);
+        if (index < mWorkspace.getChildCount() - 1) {
+            info.addAction(mActions.get(MOVE_FORWARD));
+        }
+        if (index > mWorkspace.numCustomPages()) {
+            info.addAction(mActions.get(MOVE_BACKWARD));
+        }
+    }
+}