/TalkBack/src/com/google/android/marvin/talkback/AccessibilityEventCompatUtils.java

 1/*
 2 * Copyright (C) 2011 Google Inc.
 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
17package com.google.android.marvin.talkback;
18
19import android.view.accessibility.AccessibilityEvent;
20
21import java.lang.reflect.Method;
22
23/**
24 * Provides backward-compatible access to method in {@link AccessibilityEvent}.
25 * 
26 * @author alanv@google.com (Alan Viverette)
27 */
28public class AccessibilityEventCompatUtils {
29    private static final Class<?> CLASS_AccessibilityEvent = AccessibilityEvent.class;
30    private static final Method METHOD_getMaxScrollX = CompatUtils.getMethod(
31            CLASS_AccessibilityEvent, "getMaxScrollX");
32    private static final Method METHOD_getMaxScrollY = CompatUtils.getMethod(
33            CLASS_AccessibilityEvent, "getMaxScrollY");
34
35    /**
36     * Gets the max scroll offset of the source left edge in pixels.
37     * 
38     * @return The max scroll.
39     */
40    public static int getMaxScrollX(AccessibilityEvent receiver) {
41        return (Integer) CompatUtils.invoke(receiver, -1, METHOD_getMaxScrollX);
42    }
43
44    /**
45     * Gets the max scroll offset of the source top edge in pixels.
46     * 
47     * @return The max scroll.
48     */
49    public static int getMaxScrollY(AccessibilityEvent receiver) {
50        return (Integer) CompatUtils.invoke(receiver, -1, METHOD_getMaxScrollY);
51    }
52}