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1   /*
2    * Copyright 2012 Daniel Kurka
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License"); you may not
5    * use this file except in compliance with the License. You may obtain a copy of
6    * the License at
7    * 
8    * http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations under
14   * the License.
15   */
16  package com.googlecode.mgwt.dom.client.recognizer.pinch;
17  
18  /**
19   * {@link PinchRecognizer} needs to know about display settings to calculate a
20   * pinch properly, but it should not know about widgets. THis is an abstraction
21   * interface to encapsulate that knowledge
22   * 
23   * @author Daniel
24   * 
25   */
26  public interface OffsetProvider {
27  	/**
28  	 * the upper left corner of the widget
29  	 * 
30  	 * @return the upper left corner in px
31  	 */
32  	public int getLeft();
33  
34  	/**
35  	 * the upper left corner of the widget
36  	 * 
37  	 * @return the upper left corner in px
38  	 */
39  	public int getTop();
40  }