Add strings to announce where the app splits to

Add strings to announce whether the app is split to left/top or
right/bottom.

Bug: 265752180
Test: Manual drag the app icon and check the announcement
Test: atest WMShellUnitTests
Change-Id: I0a72fcd6e4784b7693c3b467b68ddd6c606786cc

2 files changed, 34 insertions, 4 deletions

diff --git a/libs/WindowManager/Shell/res/values/strings.xml b/libs/WindowManager/Shell/res/values/strings.xml
index 250dac6cbaee..adc65dd7f699 100644
--- a/libs/WindowManager/Shell/res/values/strings.xml
+++ b/libs/WindowManager/Shell/res/values/strings.xml
@@ -100,6 +100,15 @@
     <!-- Accessibility action for moving docked stack divider to make the bottom screen full screen [CHAR LIMIT=NONE] -->
     <string name="accessibility_action_divider_bottom_full">Bottom full screen</string>
 
+    <!-- Accessibility label for splitting to the left drop zone [CHAR LIMIT=NONE] -->
+    <string name="accessibility_split_left">Split left</string>
+    <!-- Accessibility label for splitting to the right drop zone [CHAR LIMIT=NONE] -->
+    <string name="accessibility_split_right">Split right</string>
+    <!-- Accessibility label for splitting to the top drop zone [CHAR LIMIT=NONE] -->
+    <string name="accessibility_split_top">Split top</string>
+    <!-- Accessibility label for splitting to the bottom drop zone [CHAR LIMIT=NONE] -->
+    <string name="accessibility_split_bottom">Split bottom</string>
+
     <!-- One-Handed Tutorial title [CHAR LIMIT=60] -->
     <string name="one_handed_tutorial_title">Using one-handed mode</string>
     <!-- One-Handed Tutorial description [CHAR LIMIT=NONE] -->
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/draganddrop/DragLayout.java b/libs/WindowManager/Shell/src/com/android/wm/shell/draganddrop/DragLayout.java
index 55378a826385..3ade1ed9392f 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/draganddrop/DragLayout.java
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/draganddrop/DragLayout.java
@@ -22,6 +22,10 @@ import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
 
 import static com.android.wm.shell.common.split.SplitScreenConstants.SPLIT_POSITION_BOTTOM_OR_RIGHT;
 import static com.android.wm.shell.common.split.SplitScreenConstants.SPLIT_POSITION_TOP_OR_LEFT;
+import static com.android.wm.shell.draganddrop.DragAndDropPolicy.Target.TYPE_SPLIT_BOTTOM;
+import static com.android.wm.shell.draganddrop.DragAndDropPolicy.Target.TYPE_SPLIT_LEFT;
+import static com.android.wm.shell.draganddrop.DragAndDropPolicy.Target.TYPE_SPLIT_RIGHT;
+import static com.android.wm.shell.draganddrop.DragAndDropPolicy.Target.TYPE_SPLIT_TOP;
 
 import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
@@ -315,6 +319,25 @@ public class DragLayout extends LinearLayout {
                 // Switching between targets
                 mDropZoneView1.animateSwitch();
                 mDropZoneView2.animateSwitch();
+                // Announce for accessibility.
+                switch (target.type) {
+                    case TYPE_SPLIT_LEFT:
+                        mDropZoneView1.announceForAccessibility(
+                                mContext.getString(R.string.accessibility_split_left));
+                        break;
+                    case TYPE_SPLIT_RIGHT:
+                        mDropZoneView2.announceForAccessibility(
+                                mContext.getString(R.string.accessibility_split_right));
+                        break;
+                    case TYPE_SPLIT_TOP:
+                        mDropZoneView1.announceForAccessibility(
+                                mContext.getString(R.string.accessibility_split_top));
+                        break;
+                    case TYPE_SPLIT_BOTTOM:
+                        mDropZoneView2.announceForAccessibility(
+                                mContext.getString(R.string.accessibility_split_bottom));
+                        break;
+                }
             }
             mCurrentTarget = target;
         }
@@ -424,12 +447,10 @@ public class DragLayout extends LinearLayout {
     }
 
     private void animateHighlight(DragAndDropPolicy.Target target) {
-        if (target.type == DragAndDropPolicy.Target.TYPE_SPLIT_LEFT
-                || target.type == DragAndDropPolicy.Target.TYPE_SPLIT_TOP) {
+        if (target.type == TYPE_SPLIT_LEFT || target.type == TYPE_SPLIT_TOP) {
             mDropZoneView1.setShowingHighlight(true);
             mDropZoneView2.setShowingHighlight(false);
-        } else if (target.type == DragAndDropPolicy.Target.TYPE_SPLIT_RIGHT
-                || target.type == DragAndDropPolicy.Target.TYPE_SPLIT_BOTTOM) {
+        } else if (target.type == TYPE_SPLIT_RIGHT || target.type == TYPE_SPLIT_BOTTOM) {
             mDropZoneView1.setShowingHighlight(false);
             mDropZoneView2.setShowingHighlight(true);
         }