Android A11Y: Add content change type to content change event

This fixes a problem where the accessibility tree is not correctly
updated, when using e.g. a StackView. The problem was, that sometimes
when pushing items of the previous view where still selectable via
TalkBack. When popping this sometimes lead to some views not being
selectable because the subtree wasn't updated. To solve this, lets tell
android directly that the subtree changed when invalidating a view.

Fixes: QTBUG-102825
Change-Id: Ifbf8da1b95f02935b9bcffabfe821547b1128103
Reviewed-by: Assam Boudjelthia <assam.boudjelthia@qt.io>
(cherry picked from commit d48ebb02fb171d0b6fe3749a28a312fc624f8b8e)
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>

1 files changed, 19 insertions, 7 deletions

diff --git a/src/android/jar/src/org/qtproject/qt5/android/accessibility/QtAccessibilityDelegate.java b/src/android/jar/src/org/qtproject/qt5/android/accessibility/QtAccessibilityDelegate.java
index 3b910e288d..5913187acc 100644
--- a/src/android/jar/src/org/qtproject/qt5/android/accessibility/QtAccessibilityDelegate.java
+++ b/src/android/jar/src/org/qtproject/qt5/android/accessibility/QtAccessibilityDelegate.java
@@ -255,10 +255,14 @@ public class QtAccessibilityDelegate extends View.AccessibilityDelegate
 
     public boolean sendEventForVirtualViewId(int virtualViewId, int eventType)
     {
-        if ((virtualViewId == INVALID_ID) || !m_manager.isEnabled()) {
-            Log.w(TAG, "sendEventForVirtualViewId for invalid view");
+        final AccessibilityEvent event = getEventForVirtualViewId(virtualViewId, eventType);
+        return sendAccessibilityEvent(event);
+    }
+
+    public boolean sendAccessibilityEvent(AccessibilityEvent event)
+    {
+        if (event == null)
             return false;
-        }
 
         final ViewGroup group = (ViewGroup) m_view.getParent();
         if (group == null) {
@@ -266,15 +270,18 @@ public class QtAccessibilityDelegate extends View.AccessibilityDelegate
             return false;
         }
 
-        final AccessibilityEvent event;
-        event = getEventForVirtualViewId(virtualViewId, eventType);
         return group.requestSendAccessibilityEvent(m_view, event);
     }
 
     public void invalidateVirtualViewId(int virtualViewId)
     {
-        if (virtualViewId != INVALID_ID)
-            sendEventForVirtualViewId(virtualViewId, AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED);
+        final AccessibilityEvent event = getEventForVirtualViewId(virtualViewId, AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED);
+
+        if (event == null)
+            return;
+
+        event.setContentChangeTypes(AccessibilityEvent.CONTENT_CHANGE_TYPE_SUBTREE);
+        sendAccessibilityEvent(event);
     }
 
     private void setHoveredVirtualViewId(int virtualViewId)
@@ -291,6 +298,11 @@ public class QtAccessibilityDelegate extends View.AccessibilityDelegate
 
     private AccessibilityEvent getEventForVirtualViewId(int virtualViewId, int eventType)
     {
+        if ((virtualViewId == INVALID_ID) || !m_manager.isEnabled()) {
+            Log.w(TAG, "getEventForVirtualViewId for invalid view");
+            return null;
+        }
+
         final AccessibilityEvent event = AccessibilityEvent.obtain(eventType);
 
         event.setEnabled(true);