Option to control cursor in text fields using volume keys (frameworks)

This feature is moved to framework so it also works with third party keyboards.
Patch Set 3: Added missin @hide statements

Change-Id: I8e20240e7bee5351ab20bb3d701eb95a5fd3e112

core/java/android/inputmethodservice/InputMethodService.java

@@ -247,6 +247,20 @@ public class InputMethodService extends AbstractInputMethodService {
      */
     public static final int IME_VISIBLE = 0x2;
 
+    int mVolumeKeyCursorControl = 0;
+    /**
+     * @hide
+     */
+    public static final int VOLUME_CURSOR_OFF = 0;
+    /**
+     * @hide
+     */
+    public static final int VOLUME_CURSOR_ON = 1;
+    /**
+     * @hide
+     */
+    public static final int VOLUME_CURSOR_ON_REVERSE = 2;
+
     InputMethodManager mImm;
 
     int mTheme = 0;
@@ -1735,6 +1749,26 @@ public boolean onKeyDown(int keyCode, KeyEvent event) {
             }
             return false;
         }
+        if (event.getKeyCode() == KeyEvent.KEYCODE_VOLUME_UP) {
+            mVolumeKeyCursorControl = Settings.System.getInt(getContentResolver(),
+                    Settings.System.VOLUME_KEY_CURSOR_CONTROL, 0);
+            if (isInputViewShown() && (mVolumeKeyCursorControl != VOLUME_CURSOR_OFF)) {
+                sendDownUpKeyEvents((mVolumeKeyCursorControl == VOLUME_CURSOR_ON_REVERSE)
+                        ? KeyEvent.KEYCODE_DPAD_RIGHT : KeyEvent.KEYCODE_DPAD_LEFT);
+                return true;
+            }
+            return false;
+        }
+        if (event.getKeyCode() == KeyEvent.KEYCODE_VOLUME_DOWN) {
+            mVolumeKeyCursorControl = Settings.System.getInt(getContentResolver(),
+                    Settings.System.VOLUME_KEY_CURSOR_CONTROL, 0);
+            if (isInputViewShown() && (mVolumeKeyCursorControl != VOLUME_CURSOR_OFF)) {
+                sendDownUpKeyEvents((mVolumeKeyCursorControl == VOLUME_CURSOR_ON_REVERSE)
+                        ? KeyEvent.KEYCODE_DPAD_LEFT : KeyEvent.KEYCODE_DPAD_RIGHT);
+                return true;
+            }
+            return false;
+        }
         return doMovementKey(keyCode, event, MOVEMENT_DOWN);
     }
 
@@ -1780,7 +1814,15 @@ public boolean onKeyUp(int keyCode, KeyEvent event) {
                 && !event.isCanceled()) {
             return handleBack(true);
         }
-
+        if (event.getKeyCode() == KeyEvent.KEYCODE_VOLUME_UP
+                 || keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) {
+            mVolumeKeyCursorControl = Settings.System.getInt(getContentResolver(),
+                    Settings.System.VOLUME_KEY_CURSOR_CONTROL, 0);
+            if (isInputViewShown() && (mVolumeKeyCursorControl != VOLUME_CURSOR_OFF)) {
+                return true;
+            }
+            return false;
+        }
         return doMovementKey(keyCode, event, MOVEMENT_UP);
     }
 

core/java/android/provider/Settings.java

@@ -2108,6 +2108,15 @@ public static void setShowGTalkServiceStatus(ContentResolver cr, boolean flag) {
          */
         public static final String VOLBTN_MUSIC_CONTROLS = "volbtn_music_controls";
 
+         /**
+          * Volume keys control cursor in text fields (default is 0)
+          * 0 - Disabled
+          * 1 - Volume up/down moves cursor left/right
+          * 2 - Volume up/down moves cursor right/left
+          * @hide
+          */
+         public static final String VOLUME_KEY_CURSOR_CONTROL = "volume_key_cursor_control";
+
         /**
          * Settings to backup. This is here so that it's in the same place as the settings
          * keys and easy to update.