From 3abecf2ee9fc724af571f8c7da4302f7bee9eadb Mon Sep 17 00:00:00 2001
From: Frederik Gladhorn <frederik.gladhorn@digia.com>
Date: Sat, 27 Jul 2013 00:11:20 +0200
Subject: Accessibility for Android

This enables both modes for TalkBack,
explore-by-touch and the normal swiping mode.

It is partially inspired by the BarGraphView example
of the Google/Android Eyes-Free project.

Note that for any accessibility to work you'll need
a device with api level 16 at least.
Using reflection we should be able to dynamically pick up
the classes if we have the high enough api level.

Change-Id: I11b93bead451483782a1711434d45c8f9a35996f
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>
---
 .../src/org/qtproject/qt5/android/QtSurface.java   | 46 +++++++++++++++++++++-
 1 file changed, 45 insertions(+), 1 deletion(-)

(limited to 'src/android/jar')

diff --git a/src/android/jar/src/org/qtproject/qt5/android/QtSurface.java b/src/android/jar/src/org/qtproject/qt5/android/QtSurface.java
index 6cc2f1e333..cd0bddf2c8 100644
--- a/src/android/jar/src/org/qtproject/qt5/android/QtSurface.java
+++ b/src/android/jar/src/org/qtproject/qt5/android/QtSurface.java
@@ -55,17 +55,23 @@ import android.view.MotionEvent;
 import android.view.SurfaceHolder;
 import android.view.SurfaceView;
 
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Method;
+
 public class QtSurface extends SurfaceView implements SurfaceHolder.Callback
 {
     private Bitmap m_bitmap = null;
     private boolean m_started = false;
     private boolean m_usesGL = false;
     private GestureDetector m_gestureDetector;
+    private Object m_accessibilityDelegate = null;
 
     public QtSurface(Context context, int id)
     {
         super(context);
-        setFocusable(true);
+        setFocusable(false);
+        setFocusableInTouchMode(false);
+
         getHolder().addCallback(this);
         getHolder().setType(SurfaceHolder.SURFACE_TYPE_GPU);
         setId(id);
@@ -107,6 +113,44 @@ public class QtSurface extends SurfaceView implements SurfaceHolder.Callback
 
         if (m_usesGL)
             holder.setFormat(PixelFormat.RGBA_8888);
+
+
+        // Initialize Accessibility
+        // The accessibility code depends on android API level 16, so dynamically resolve it
+        try {
+            final String a11yDelegateClassName = "org.qtproject.qt5.android.accessibility.QtAccessibilityDelegate";
+            Class<?> qtDelegateClass = Class.forName(a11yDelegateClassName);
+            Constructor constructor = qtDelegateClass.getConstructor(Class.forName("android.view.View"));
+            m_accessibilityDelegate = constructor.newInstance(this);
+
+            Class a11yDelegateClass = Class.forName("android.view.View$AccessibilityDelegate");
+            Method setDelegateMethod = this.getClass().getMethod("setAccessibilityDelegate", a11yDelegateClass);
+            setDelegateMethod.invoke(this, m_accessibilityDelegate);
+        } catch (ClassNotFoundException e) {
+            // Class not found is fine since we are compatible with Android API < 16, but the function will
+            // only be available with that API level.
+        } catch (Exception e) {
+            // Unknown exception means something went wrong.
+            Log.w("Qt A11y", "Unknown exception: " + e.toString());
+        }
+    }
+
+    public boolean dispatchHoverEvent(MotionEvent event) {
+        // Always attempt to dispatch hover events to accessibility first.
+        if (m_accessibilityDelegate != null) {
+            try {
+                Method dispHoverA11y = m_accessibilityDelegate.getClass().getMethod("dispatchHoverEvent", MotionEvent.class);
+                boolean ret = (Boolean) dispHoverA11y.invoke(m_accessibilityDelegate, event);
+                if (ret)
+                    return true;
+                SurfaceView view = (SurfaceView) this;
+                Method dispHoverView = view.getClass().getMethod("dispatchHoverEvent", MotionEvent.class);
+                return (Boolean) dispHoverView.invoke(view, event);
+            } catch (Exception e) {
+                Log.w("Qt A11y", "EXCEPTION in dispatchHoverEvent for Accessibility: " + e);
+            }
+        }
+        return false;
     }
 
     @Override
-- 
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