// 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);
}