[Android WebView] Enable spatial navigation / DPAD

android_webview/java/src/org/chromium/android_webview/AwWebContentsDelegateAdapter.java

Index: android_webview/java/src/org/chromium/android_webview/AwWebContentsDelegateAdapter.java
diff --git a/android_webview/java/src/org/chromium/android_webview/AwWebContentsDelegateAdapter.java b/android_webview/java/src/org/chromium/android_webview/AwWebContentsDelegateAdapter.java
index da09a1a3eb0c9816f9cd5e5e638c42e7f5df459b..7e3512d7ec64f28b71cf73d941ba2f3540d9a5f6 100644
--- a/android_webview/java/src/org/chromium/android_webview/AwWebContentsDelegateAdapter.java
+++ b/android_webview/java/src/org/chromium/android_webview/AwWebContentsDelegateAdapter.java
@@ -10,6 +10,7 @@ import android.os.Looper;
 import android.os.Message;
 import android.util.Log;
 import android.view.KeyEvent;
+import android.view.View;
 import android.webkit.ConsoleMessage;
 import android.webkit.ValueCallback;
 
@@ -37,11 +38,14 @@ class AwWebContentsDelegateAdapter extends AwWebContentsDelegate {
 
     final AwContentsClient mContentsClient;
     final PreferredSizeChangedListener mPreferredSizeChangedListener;
+    final View mContainerView;
 
     public AwWebContentsDelegateAdapter(AwContentsClient contentsClient,
-            PreferredSizeChangedListener preferredSizeChangedListener) {
+            PreferredSizeChangedListener preferredSizeChangedListener,
+            View containerView) {
         mContentsClient = contentsClient;
         mPreferredSizeChangedListener = preferredSizeChangedListener;
+        mContainerView = containerView;
     }
 
     @Override
@@ -51,10 +55,46 @@ class AwWebContentsDelegateAdapter extends AwWebContentsDelegate {
 
     @Override
     public void handleKeyboardEvent(KeyEvent event) {
+        if (event.getAction() == KeyEvent.ACTION_DOWN) {
+            int direction;
+            switch (event.getKeyCode()) {
+                case KeyEvent.KEYCODE_DPAD_DOWN:
+                    direction = View.FOCUS_DOWN;
+                    break;
+                case KeyEvent.KEYCODE_DPAD_UP:
+                    direction = View.FOCUS_UP;
+                    break;
+                case KeyEvent.KEYCODE_DPAD_LEFT:
+                    direction = View.FOCUS_LEFT;
+                    break;
+                case KeyEvent.KEYCODE_DPAD_RIGHT:
+                    direction = View.FOCUS_RIGHT;
+                    break;
+                default:
+                    direction = 0;
+                    break;
+            }
+            if (direction != 0 && tryToMoveFocus(direction)) return;
+        }
         mContentsClient.onUnhandledKeyEvent(event);
     }
 
     @Override
+    public boolean takeFocus(boolean reverse) {
+        int direction =
+            (reverse == (mContainerView.getLayoutDirection() == View.LAYOUT_DIRECTION_RTL)) ?
+            View.FOCUS_RIGHT : View.FOCUS_LEFT;
+        if (tryToMoveFocus(direction)) return true;
+        direction = reverse ? View.FOCUS_UP : View.FOCUS_DOWN;
+        return tryToMoveFocus(direction);
+    }
+
+    private boolean tryToMoveFocus(int direction) {
+        View focus = mContainerView.focusSearch(direction);
+        return focus != null && focus != mContainerView && focus.requestFocus();
+    }
+
+    @Override
     public boolean addMessageToConsole(int level, String message, int lineNumber,
             String sourceId) {
         ConsoleMessage.MessageLevel messageLevel = ConsoleMessage.MessageLevel.DEBUG;