| // Copyright 2013 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; |
| |
| /** |
| * Used to register listeners that can be notified of changes to the position of a view. |
| */ |
| public interface PositionObserver { |
| public interface Listener { |
| /** |
| * Called during predraw if the position of the underlying view has changed. |
| */ |
| void onPositionChanged(int positionX, int positionY); |
| } |
| |
| /** |
| * @return The current x position of the observed view. |
| */ |
| int getPositionX(); |
| |
| /** |
| * @return The current y position of the observed view. |
| */ |
| int getPositionY(); |
| |
| /** |
| * Register a listener to be called when the position of the underlying view changes. |
| */ |
| void addListener(Listener listener); |
| |
| /** |
| * Remove a previously installed listener. |
| */ |
| void removeListener(Listener listener); |
| } |