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1 // Copyright 2013 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 package org.chromium.content.browser; | |
6 | |
7 /** | |
8 * Used to register listeners that can be notified of changes to the position of a view. | |
9 */ | |
10 public interface PositionObserver { | |
11 public interface Listener { | |
12 /** | |
13 * Called during predraw if the position of the underlying view has chan ged. | |
14 */ | |
15 public void onPositionChanged(int positionX, int positionY); | |
Ted C
2013/10/14 23:46:44
as a small nit, public isn't needed on any methods
| |
16 } | |
17 | |
18 /** | |
19 * @return The current x position of the observed view. | |
20 */ | |
21 public int getPositionX(); | |
22 | |
23 /** | |
24 * @return The current y position of the observed view. | |
25 */ | |
26 public int getPositionY(); | |
27 | |
28 /** | |
29 * Register a listener to be called when the position of the underlying view changes. | |
30 */ | |
31 public void addListener(Listener listener); | |
32 | |
33 /** | |
34 * Remove a previously installed listener. | |
35 */ | |
36 public void removeListener(Listener listener); | |
37 } | |
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