commit 3f51631b806fb81e2b76a626edcb78f1b46118d1
author Vadim Tryshev <vadimt@google.com> Wed May 16 11:26:17 2018 -0700
committer Vadim Tryshev <vadimt@google.com> Wed May 16 12:00:33 2018 -0700
tree 5a47e387b68e890f13a1147799430e0140f945d8
parent d9a1337b40fcb1041bba48cd59d7f358f5b7895f

Adding Clear All to accessibility chevron on Recents

For motivation, see email thread "Tweaks to for the reverted order of
accessibility swiping"

This doesn't add the action to the fallback Recents, so it will require
more work.

Bug: 79165501
Test: Manual
Change-Id: I99d608ccc13cc1742dc4d427e763125788e8edd2

quickstep/src/com/android/quickstep/views/ShelfScrimView.java

diff --git a/quickstep/src/com/android/quickstep/views/ShelfScrimView.java b/quickstep/src/com/android/quickstep/views/ShelfScrimView.java
index 69b77b4..24afd48 100644
--- a/quickstep/src/com/android/quickstep/views/ShelfScrimView.java
+++ b/quickstep/src/com/android/quickstep/views/ShelfScrimView.java
@@ -28,6 +28,9 @@
 import android.graphics.Path;
 import android.graphics.Path.Direction;
 import android.graphics.Path.Op;
+import android.os.Bundle;
+import android.support.annotation.NonNull;
+import android.support.v4.view.accessibility.AccessibilityNodeInfoCompat;
 import android.util.AttributeSet;
 
 import com.android.launcher3.DeviceProfile;
@@ -48,6 +51,7 @@
     private static final int THRESHOLD_ALPHA_DARK = 102;
     private static final int THRESHOLD_ALPHA_LIGHT = 46;
     private static final int THRESHOLD_ALPHA_SUPER_LIGHT = 128;
+    private static final int CLEAR_ALL_TASKS = R.string.recents_clear_all;
 
     // In transposed layout, we simply draw a flat color.
     private boolean mDrawingFlatColor;
@@ -213,4 +217,43 @@
                 mRadius, mRadius, mPaint);
         return minTop - mDragHandleSize - top;
     }
+
+    @NonNull
+    @Override
+    protected AccessibilityHelper createAccessibilityHelper() {
+        return new ShelfScrimAccessibilityHelper();
+    }
+
+    protected class ShelfScrimAccessibilityHelper extends AccessibilityHelper {
+        @Override
+        protected void onPopulateNodeForVirtualView(int virtualViewId,
+                AccessibilityNodeInfoCompat node) {
+            super.onPopulateNodeForVirtualView(virtualViewId, node);
+
+            if (mLauncher.isInState(OVERVIEW)) {
+                final RecentsView overviewPanel = mLauncher.getOverviewPanel();
+                if (overviewPanel.getChildCount() != 0) {
+                    node.addAction(
+                            new AccessibilityNodeInfoCompat.AccessibilityActionCompat(
+                                    CLEAR_ALL_TASKS,
+                                    getContext().getText(CLEAR_ALL_TASKS)));
+                }
+            }
+        }
+
+        @Override
+        protected boolean onPerformActionForVirtualView(
+                int virtualViewId, int action, Bundle arguments) {
+            if (super.onPerformActionForVirtualView(virtualViewId, action, arguments)) return true;
+
+            if (action == CLEAR_ALL_TASKS) {
+                if (mLauncher.isInState(OVERVIEW)) {
+                    mLauncher.<RecentsView>getOverviewPanel().dismissAllTasks();
+                }
+                return true;
+            }
+
+            return false;
+        }
+    }
 }

src/com/android/launcher3/views/ScrimView.java

diff --git a/src/com/android/launcher3/views/ScrimView.java b/src/com/android/launcher3/views/ScrimView.java
index 5dcfe4a..49e96be 100644
--- a/src/com/android/launcher3/views/ScrimView.java
+++ b/src/com/android/launcher3/views/ScrimView.java
@@ -38,6 +38,7 @@
 import android.graphics.RectF;
 import android.graphics.drawable.Drawable;
 import android.os.Bundle;
+import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.support.v4.view.ViewCompat;
 import android.support.v4.view.accessibility.AccessibilityNodeInfoCompat;
@@ -113,12 +114,17 @@
                 .getDimensionPixelSize(R.dimen.vertical_drag_handle_size);
         mDragHandleBounds = new Rect(0, 0, mDragHandleSize, mDragHandleSize);
 
-        mAccessibilityHelper = new AccessibilityHelper();
+        mAccessibilityHelper = createAccessibilityHelper();
         ViewCompat.setAccessibilityDelegate(this, mAccessibilityHelper);
 
         mAM = (AccessibilityManager) context.getSystemService(ACCESSIBILITY_SERVICE);
     }
 
+    @NonNull
+    protected AccessibilityHelper createAccessibilityHelper() {
+        return new AccessibilityHelper();
+    }
+
     @Override
     public void setInsets(Rect insets) {
         updateDragHandleBounds();
@@ -190,6 +196,9 @@
         if (mCurrentFlatColor != 0) {
             canvas.drawColor(mCurrentFlatColor);
         }
+        if (mDragHandle != null) {
+            mDragHandle.draw(canvas);
+        }
     }
 
     @Override
@@ -323,7 +332,7 @@
                 : IMPORTANT_FOR_ACCESSIBILITY_AUTO);
     }
 
-    private class AccessibilityHelper extends ExploreByTouchHelper {
+    protected class AccessibilityHelper extends ExploreByTouchHelper {
 
         private static final int DRAG_HANDLE_ID = 1;