[Android] Focus/Blur contents when window focus changes

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

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.content.browser;
 
 import android.annotation.SuppressLint;
 import android.annotation.TargetApi;
 import android.app.assist.AssistStructure.ViewNode;
 import android.content.ClipData;
@@ skipping 342 matching lines @@
     // screen orientation.
     private boolean mFullscreenRequiredForOrientationLock = true;
 
     // A ViewAndroidDelegate that delegates to the current container view.
     private ViewAndroidDelegate mViewAndroidDelegate;
 
     // NOTE: This object will not be released by Android framework until the matching
     // ResultReceiver in the InputMethodService (IME app) gets gc'ed.
     private ShowKeyboardResultReceiver mShowKeyboardResultReceiver;
 
+    private Boolean mHasViewFocus;
+
     // The list of observers that are notified when ContentViewCore changes its WindowAndroid.
     private final ObserverList<WindowAndroidChangedObserver> mWindowAndroidChangedObservers;
 
     /**
      * @param webContents The {@link WebContents} to find a {@link ContentViewCore} of.
      * @return            A {@link ContentViewCore} that is connected to {@code webContents} or
      *                    {@code null} if none exists.
      */
     public static ContentViewCore fromWebContents(WebContents webContents) {
         return nativeFromWebContentsAndroid(webContents);
@@ skipping 934 matching lines @@
         }
     }
 
     private void cancelRequestToScrollFocusedEditableNodeIntoView() {
         // Zero-ing the rect will prevent |updateAfterSizeChanged()| from
         // issuing the delayed form focus event.
         mFocusPreOSKViewportRect.setEmpty();
     }
 
     /**
+     * When the activity pauses, the content should lose focus.
+     * TODO(mthiesse): See crbug.com/686232 for context. Desktop platforms use keyboard focus to
+     * trigger blur/focus, and the equivalent to this on Android is Window focus. However, we don't
+     * use Window focus because of the complexity around popups stealing Window focus.
+     */
+    public void onPause() {
+        onFocusChanged(false, true);
+    }
+
+    /**
+     * When the activity resumes, the View#onFocusChanged may not be called, so we should restore
+     * the View focus state.
+     */
+    public void onResume() {
+        onFocusChanged(getContainerView().hasFocus(), true);
+    }
+
+    /**
      * @see View#onWindowFocusChanged(boolean)
      */
     public void onWindowFocusChanged(boolean hasWindowFocus) {
         mImeAdapter.onWindowFocusChanged(hasWindowFocus);
         if (!hasWindowFocus) resetGestureDetection();
         mSelectionPopupController.onWindowFocusChanged(hasWindowFocus);
         for (mGestureStateListenersIterator.rewind(); mGestureStateListenersIterator.hasNext();) {
             mGestureStateListenersIterator.next().onWindowFocusChanged(hasWindowFocus);
         }
     }
 
     public void onFocusChanged(boolean gainFocus, boolean hideKeyboardOnBlur) {
+        if (mHasViewFocus != null && mHasViewFocus == gainFocus) return;
+        mHasViewFocus = gainFocus;
         mImeAdapter.onViewFocusChanged(gainFocus, hideKeyboardOnBlur);
 
         if (mJoystickScrollProvider != null) {
             mJoystickScrollProvider.setEnabled(gainFocus && !isFocusedNodeEditable());
         }
 
         if (gainFocus) {
             restoreSelectionPopupsIfNecessary();
         } else {
             cancelRequestToScrollFocusedEditableNodeIntoView();
@@ skipping 1311 matching lines @@
     private native void nativeSetTextTrackSettings(long nativeContentViewCoreImpl,
             boolean textTracksEnabled, String textTrackBackgroundColor, String textTrackFontFamily,
             String textTrackFontStyle, String textTrackFontVariant, String textTrackTextColor,
             String textTrackTextShadow, String textTrackTextSize);
 
     private native void nativeSetBackgroundOpaque(long nativeContentViewCoreImpl, boolean opaque);
     private native boolean nativeIsTouchDragDropEnabled(long nativeContentViewCoreImpl);
     private native void nativeOnDragEvent(long nativeContentViewCoreImpl, int action, int x, int y,
             int screenX, int screenY, String[] mimeTypes, String content);
 }