Native Android accessibility.

content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java

Index: content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
index eeebf036b9d11f23fecddf5bb13100e046585029..64276aa32631f319c0281ebf473f16a78402b061 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
@@ -9,14 +9,18 @@ import android.content.Context;
 import android.content.pm.ActivityInfo;
 import android.content.pm.PackageManager;
 import android.content.res.Configuration;
+import android.database.ContentObserver;
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
 import android.graphics.Color;
 import android.graphics.Rect;
+import android.net.Uri;
 import android.os.Build;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.ResultReceiver;
+import android.provider.Settings;
+import android.provider.Settings.Secure;
 import android.text.Editable;
 import android.util.Log;
 import android.util.Pair;
@@ -30,7 +34,10 @@ import android.view.ViewGroup;
 import android.view.Window;
 import android.view.WindowManager;
 import android.view.accessibility.AccessibilityEvent;
+import android.view.accessibility.AccessibilityManager;
+import android.view.accessibility.AccessibilityManager.AccessibilityStateChangeListener;
 import android.view.accessibility.AccessibilityNodeInfo;
+import android.view.accessibility.AccessibilityNodeProvider;
 import android.view.inputmethod.EditorInfo;
 import android.view.inputmethod.InputConnection;
 import android.view.inputmethod.InputMethodManager;
@@ -44,6 +51,7 @@ import org.chromium.base.WeakContext;
 import org.chromium.content.R;
 import org.chromium.content.browser.ContentViewGestureHandler.MotionEventDelegate;
 import org.chromium.content.browser.accessibility.AccessibilityInjector;
+import org.chromium.content.browser.accessibility.BaseBrowserAccessibilityManager;
 import org.chromium.content.browser.input.AdapterInputConnection;
 import org.chromium.content.browser.input.HandleView;
 import org.chromium.content.browser.input.ImeAdapter;
@@ -58,6 +66,8 @@ import org.chromium.ui.WindowAndroid;
 import org.chromium.ui.gfx.DeviceDisplayInfo;
 
 import java.lang.annotation.Annotation;
+import java.lang.reflect.Field;
+import java.util.Arrays;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Map;
@@ -68,7 +78,9 @@ import java.util.Map;
  * being tied to the view system.
  */
 @JNINamespace("content")
-public class ContentViewCore implements MotionEventDelegate, NavigationClient {
+    public class ContentViewCore implements MotionEventDelegate,
+                                            NavigationClient,
+                                            AccessibilityStateChangeListener {
     /**
      * Indicates that input events are batched together and delivered just before vsync.
      */
@@ -348,6 +360,12 @@ public class ContentViewCore implements MotionEventDelegate, NavigationClient {
     // The AccessibilityInjector that handles loading Accessibility scripts into the web page.
     private AccessibilityInjector mAccessibilityInjector;
 
+    // Handles native accessibility, i.e. without any script injection.
+    private BaseBrowserAccessibilityManager mBrowserAccessibilityManager;
+
+    // System accessibility service.
+    private final AccessibilityManager mAccessibilityManager;
+
     // Temporary notification to tell onSizeChanged to focus a form element,
     // because the OSK was just brought up.
     private boolean mUnfocusOnNextSizeChanged = false;
@@ -369,6 +387,7 @@ public class ContentViewCore implements MotionEventDelegate, NavigationClient {
 
     private ViewAndroid mViewAndroid;
 
+
     /**
      * Constructs a new ContentViewCore. Embedders must call initialize() after constructing
      * a ContentViewCore and before using it.
@@ -388,6 +407,8 @@ public class ContentViewCore implements MotionEventDelegate, NavigationClient {
         mStartHandlePoint = mRenderCoordinates.createNormalizedPoint();
         mEndHandlePoint = mRenderCoordinates.createNormalizedPoint();
         mInsertionHandlePoint = mRenderCoordinates.createNormalizedPoint();
+        mAccessibilityManager = (AccessibilityManager)
+                getContext().getSystemService(Context.ACCESSIBILITY_SERVICE);
     }
 
     /**
@@ -633,8 +654,24 @@ public class ContentViewCore implements MotionEventDelegate, NavigationClient {
         mContentSettings = new ContentSettings(this, mNativeContentViewCore);
         initializeContainerView(internalDispatcher, inputEventDeliveryMode);
 
+        try {
+            Field field = Settings.Secure.class.getField("ACCESSIBILITY_SCRIPT_INJECTION");
+            field.setAccessible(true);
+            String accessibilityScriptInjection = (String) field.get(null);
+            getContext().getContentResolver().registerContentObserver(
+                Settings.Secure.getUriFor(accessibilityScriptInjection),
+                false,
+                new ContentObserver(new Handler()) {
+                    public void onChange(boolean selfChange, Uri uri) {
+                        setAccessibilityState(mAccessibilityManager.isEnabled());
+                    }
+                });
+        } catch (Exception e) {
+            Log.e("chromium", "Could not add listener for script injection preference. " +
+                      "Defaulting to native accessibility.\n" + e.toString());
+        }
+
         mAccessibilityInjector = AccessibilityInjector.newInstance(this);
-        mAccessibilityInjector.addOrRemoveAccessibilityApisIfNecessary();
 
         String contentDescription = "Web View";
         if (R.string.accessibility_content_view == 0) {
@@ -1288,7 +1325,6 @@ public class ContentViewCore implements MotionEventDelegate, NavigationClient {
         TraceEvent.begin();
         hidePopupDialog();
         nativeOnHide(mNativeContentViewCore);
-        setAccessibilityState(false);
         TraceEvent.end();
     }
 
@@ -1297,7 +1333,7 @@ public class ContentViewCore implements MotionEventDelegate, NavigationClient {
      */
     public void onActivityResume() {
         nativeOnShow(mNativeContentViewCore);
-        setAccessibilityState(true);
+        setAccessibilityState(mAccessibilityManager.isEnabled());
     }
 
     /**
@@ -1305,7 +1341,7 @@ public class ContentViewCore implements MotionEventDelegate, NavigationClient {
      */
     public void onShow() {
         nativeOnShow(mNativeContentViewCore);
-        setAccessibilityState(true);
+        setAccessibilityState(mAccessibilityManager.isEnabled());
     }
 
     /**
@@ -1313,7 +1349,7 @@ public class ContentViewCore implements MotionEventDelegate, NavigationClient {
      */
     public void onHide() {
         hidePopupDialog();
-        setAccessibilityState(false);
+        setInjectedAccessibility(false);
         nativeOnHide(mNativeContentViewCore);
     }
 
@@ -1366,7 +1402,7 @@ public class ContentViewCore implements MotionEventDelegate, NavigationClient {
                 ChildProcessLauncher.bindAsHighPriority(pid);
             }
         }
-        setAccessibilityState(true);
+        setAccessibilityState(mAccessibilityManager.isEnabled());
     }
 
     /**
@@ -1381,7 +1417,7 @@ public class ContentViewCore implements MotionEventDelegate, NavigationClient {
                 ChildProcessLauncher.unbindAsHighPriority(pid);
             }
         }
-        setAccessibilityState(false);
+        setInjectedAccessibility(false);
         hidePopupDialog();
         mZoomControlsDelegate.dismissZoomPicker();
     }
@@ -1646,6 +1682,23 @@ public class ContentViewCore implements MotionEventDelegate, NavigationClient {
     }
 
     /**
+     * Any View that uses ContentViewCore should call override dispatchHoverEvent
+     * and call this method first so that all hover events can be intercepted and
+     * used for touch exploration if accessibility is on, and then only call the
+     * inherited method if this returns false.
+     *
+     * @see View#dispatchHoverEvent(MotionEvent)
+     */
+    public boolean dispatchHoverEvent(MotionEvent event) {
+        if (mBrowserAccessibilityManager != null) {
+            return mBrowserAccessibilityManager.dispatchHoverEvent(event);
+        } else {
+            // The client view should call super.dispatchHoverEvent.
+            return false;
+        }
+    }
+
+    /**
      * @see View#scrollBy(int, int)
      * Currently the ContentView scrolling happens in the native side. In
      * the Java view system, it is always pinned at (0, 0). scrollBy() and scrollTo()
@@ -2171,6 +2224,9 @@ public class ContentViewCore implements MotionEventDelegate, NavigationClient {
                 controlsOffsetPix, contentOffsetYPix, overdrawBottomHeightPix);
 
         mPendingRendererFrame = true;
+        if (mBrowserAccessibilityManager != null) {
+            mBrowserAccessibilityManager.notifyFrameInfoInitialized();
+        }
     }
 
     @SuppressWarnings("unused")
@@ -2553,6 +2609,11 @@ public class ContentViewCore implements MotionEventDelegate, NavigationClient {
         getContentViewClient().onStartContentIntent(getContext(), contentUrl);
     }
 
+    @Override
+    public void onAccessibilityStateChanged(boolean enabled) {
+        setAccessibilityState(enabled);
+    }
+
     /**
      * Determines whether or not this ContentViewCore can handle this accessibility action.
      * @param action The action to perform.
@@ -2581,9 +2642,30 @@ public class ContentViewCore implements MotionEventDelegate, NavigationClient {
     }
 
     /**
+     * Set the BrowserAccessibilityManager, used for native accessibility
+     * (not script injection). This is only set when system accessibility
+     * has been enabled.
+     * @param manager The new BrowserAccessibilityManager.
+     */
+    public void setBrowserAccessibilityManager(BaseBrowserAccessibilityManager manager) {
+        mBrowserAccessibilityManager = manager;
+    }
+
+    /**
+     * Get the BrowserAccessibilityManager, used for native accessibility
+     * (not script injection). This will return null when system accessibility
+     * is not enabled.
+     * @return This view's BrowserAccessibilityManager.
+     */
+    public BaseBrowserAccessibilityManager getBrowserAccessibilityManager() {
+        return mBrowserAccessibilityManager;
+    }
+
+    /**
      * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)
      */
     public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
+        // Note: this is only used by the script-injecting accessibility code.
         mAccessibilityInjector.onInitializeAccessibilityNodeInfo(info);
     }
 
@@ -2591,6 +2673,7 @@ public class ContentViewCore implements MotionEventDelegate, NavigationClient {
      * @see View#onInitializeAccessibilityEvent(AccessibilityEvent)
      */
     public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
+        // Note: this is only used by the script-injecting accessibility code.
         event.setClassName(this.getClass().getName());
 
         // Identify where the top-left of the screen currently points to.
@@ -2612,6 +2695,35 @@ public class ContentViewCore implements MotionEventDelegate, NavigationClient {
     }
 
     /**
+     * Returns whether accessibility script injection is enabled on the device
+     */
+    public boolean isDeviceAccessibilityScriptInjectionEnabled() {
+        try {
+            if (!mContentSettings.getJavaScriptEnabled()) {
+                return false;
+            }
+
+            int result = getContext().checkCallingOrSelfPermission(
+                    android.Manifest.permission.INTERNET);
+            if (result != PackageManager.PERMISSION_GRANTED) {
+                return false;
+            }
+
+            Field field = Settings.Secure.class.getField("ACCESSIBILITY_SCRIPT_INJECTION");
+            field.setAccessible(true);
+            String accessibilityScriptInjection = (String) field.get(null);
+
+            boolean onDeviceScriptInjectionEnabled =
+                    Settings.Secure.getInt(getContext().getContentResolver(),
+                            accessibilityScriptInjection, 0) == 1;
+            return onDeviceScriptInjectionEnabled;
+        } catch (NoSuchFieldException e) {
+        } catch (IllegalAccessException e) {
+        }
+        return false;
+    }
+
+    /**
      * Returns whether or not accessibility injection is being used.
      */
     public boolean isInjectingAccessibilityScript() {
@@ -2619,10 +2731,40 @@ public class ContentViewCore implements MotionEventDelegate, NavigationClient {
     }
 
     /**
-     * Enable or disable accessibility features.
+     * Turns browser accessibility on or off.
+     * If |state| is |false|, this turns off both native and injected accessibility.
+     * Otherwise, if accessibility script injection is enabled, this will enable the injected
+     * accessibility scripts, and if it is disabled this will enable the native accessibility.
      */
     public void setAccessibilityState(boolean state) {
-        mAccessibilityInjector.setScriptEnabled(state);
+        boolean injectedAccessibility = false;
+        boolean nativeAccessibility = false;
+        if (state) {
+            if (isDeviceAccessibilityScriptInjectionEnabled()) {
+                injectedAccessibility = true;
+            } else {
+                nativeAccessibility = true;
+            }
+        }
+        setInjectedAccessibility(injectedAccessibility);
+        setNativeAccessibilityState(nativeAccessibility);
+    }
+
+    /**
+     * Enable or disable native accessibility features.
+     */
+    public void setNativeAccessibilityState(boolean enabled) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
+            nativeSetAccessibilityEnabled(mNativeContentViewCore, enabled);
+        }
+    }
+
+    /**
+     * Enable or disable injected accessibility features
+     */
+    public void setInjectedAccessibility(boolean enabled) {
+        mAccessibilityInjector.addOrRemoveAccessibilityApisIfNecessary();
+        mAccessibilityInjector.setScriptEnabled(enabled);
     }
 
     /**
@@ -2955,4 +3097,7 @@ public class ContentViewCore implements MotionEventDelegate, NavigationClient {
 
     private native void nativeDetachExternalVideoSurface(
             int nativeContentViewCoreImpl, int playerId);
+
+    private native void nativeSetAccessibilityEnabled(
+            int nativeContentViewCoreImpl, boolean enabled);
 }