Android: Qml accessibility fixes

- Accessibility focus can follow the position of the widget
  (for example when swiping on a scrollview)

- controls are clickable directly after appearing on the screen after
  scroll (previously you had to click somewhere else on the screen,
  and after that you could focus the newly appeared control)

- checkbox and switch react correctly on click action

- fixed combobox behavior with accessibility enabled

Task-number: QTBUG-79611
Pick-to: 6.0 5.15
Change-Id: If36914ab0165f33593e68fd7ecf168693f8538a7
Reviewed-by: Assam Boudjelthia <assam.boudjelthia@qt.io>

4 files changed, 93 insertions, 5 deletions

diff --git a/src/android/jar/src/org/qtproject/qt/android/QtActivityDelegate.java b/src/android/jar/src/org/qtproject/qt/android/QtActivityDelegate.java
index 35d86611c6..3785eb4011 100644
--- a/src/android/jar/src/org/qtproject/qt/android/QtActivityDelegate.java
+++ b/src/android/jar/src/org/qtproject/qt/android/QtActivityDelegate.java
@@ -159,6 +159,8 @@ public class QtActivityDelegate
     private CursorHandle m_rightSelectionHandle;
     private EditPopupMenu m_editPopupMenu;
 
+    private QtAccessibilityDelegate m_accessibilityDelegate = null;
+
 
     public void setSystemUiVisibility(int systemUiVisibility)
     {
@@ -876,10 +878,30 @@ public class QtActivityDelegate
         m_splashScreen.startAnimation(fadeOut);
     }
 
+    public void notifyAccessibilityLocationChange()
+    {
+        if (m_accessibilityDelegate == null)
+            return;
+        m_accessibilityDelegate.notifyLocationChange();
+    }
+
+    public void notifyObjectHide(int viewId)
+    {
+        if (m_accessibilityDelegate == null)
+            return;
+        m_accessibilityDelegate.notifyObjectHide(viewId);
+    }
+
+    public void notifyObjectFocus(int viewId)
+    {
+        if (m_accessibilityDelegate == null)
+            return;
+        m_accessibilityDelegate.notifyObjectFocus(viewId);
+    }
 
     public void initializeAccessibility()
     {
-        new QtAccessibilityDelegate(m_activity, m_layout, this);
+        m_accessibilityDelegate = new QtAccessibilityDelegate(m_activity, m_layout, this);
     }
 
     public void onWindowFocusChanged(boolean hasFocus) {
diff --git a/src/android/jar/src/org/qtproject/qt/android/QtNative.java b/src/android/jar/src/org/qtproject/qt/android/QtNative.java
index bd11b255f5..001e6a7970 100644
--- a/src/android/jar/src/org/qtproject/qt/android/QtNative.java
+++ b/src/android/jar/src/org/qtproject/qt/android/QtNative.java
@@ -934,6 +934,42 @@ public class QtNative
         });
     }
 
+    private static void notifyAccessibilityLocationChange()
+    {
+        runAction(new Runnable() {
+            @Override
+            public void run() {
+                if (m_activityDelegate != null) {
+                    m_activityDelegate.notifyAccessibilityLocationChange();
+                }
+            }
+        });
+    }
+
+    private static void notifyObjectHide(final int viewId)
+    {
+        runAction(new Runnable() {
+            @Override
+            public void run() {
+                if (m_activityDelegate != null) {
+                    m_activityDelegate.notifyObjectHide(viewId);
+                }
+            }
+        });
+    }
+
+    private static void notifyObjectFocus(final int viewId)
+    {
+        runAction(new Runnable() {
+            @Override
+            public void run() {
+                if (m_activityDelegate != null) {
+                    m_activityDelegate.notifyObjectFocus(viewId);
+                }
+            }
+        });
+    }
+
     private static void registerClipboardManager()
     {
         if (m_service == null || m_activity != null) { // Avoid freezing if only service
diff --git a/src/android/jar/src/org/qtproject/qt/android/accessibility/QtAccessibilityDelegate.java b/src/android/jar/src/org/qtproject/qt/android/accessibility/QtAccessibilityDelegate.java
index 1591a5b52e..57b43bc279 100644
--- a/src/android/jar/src/org/qtproject/qt/android/accessibility/QtAccessibilityDelegate.java
+++ b/src/android/jar/src/org/qtproject/qt/android/accessibility/QtAccessibilityDelegate.java
@@ -191,6 +191,23 @@ public class QtAccessibilityDelegate extends View.AccessibilityDelegate
         return true;
     }
 
+    public void notifyLocationChange()
+    {
+        invalidateVirtualViewId(m_focusedVirtualViewId);
+    }
+
+    public void notifyObjectHide(int viewId)
+    {
+        invalidateVirtualViewId(viewId);
+    }
+
+    public void notifyObjectFocus(int viewId)
+    {
+        m_view.invalidate();
+        sendEventForVirtualViewId(viewId,
+                AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED);
+    }
+
     public boolean sendEventForVirtualViewId(int virtualViewId, int eventType)
     {
         if ((virtualViewId == INVALID_ID) || !m_manager.isEnabled()) {
@@ -211,7 +228,8 @@ public class QtAccessibilityDelegate extends View.AccessibilityDelegate
 
     public void invalidateVirtualViewId(int virtualViewId)
     {
-        sendEventForVirtualViewId(virtualViewId, AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED);
+        if (virtualViewId != INVALID_ID)
+            sendEventForVirtualViewId(virtualViewId, AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED);
     }
 
     private void setHoveredVirtualViewId(int virtualViewId)
@@ -336,9 +354,6 @@ public class QtAccessibilityDelegate extends View.AccessibilityDelegate
             node.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS);
         }
 
-        int[] ids = QtNativeAccessibility.childIdListForAccessibleObject(virtualViewId);
-        for (int i = 0; i < ids.length; ++i)
-            node.addChild(m_view, ids[i]);
         return node;
     }
 
diff --git a/src/android/java/src/org/qtproject/qt/android/bindings/QtActivity.java b/src/android/java/src/org/qtproject/qt/android/bindings/QtActivity.java
index 1b34658300..a4e6df058d 100644
--- a/src/android/java/src/org/qtproject/qt/android/bindings/QtActivity.java
+++ b/src/android/java/src/org/qtproject/qt/android/bindings/QtActivity.java
@@ -1116,4 +1116,19 @@ public class QtActivity extends Activity
     {
         QtNative.activityDelegate().updateSelection(selStart, selEnd, candidatesStart, candidatesEnd);
     }
+
+    public void notifyAccessibilityLocationChange()
+    {
+        QtNative.activityDelegate().notifyAccessibilityLocationChange();
+    }
+
+    public void notifyObjectHide(int viewId)
+    {
+        QtNative.activityDelegate().notifyObjectHide(viewId);
+    }
+
+    public void notifyObjectFocus(int viewId)
+    {
+        QtNative.activityDelegate().notifyObjectFocus(viewId);
+    }
 }