android.support.v4.view.accessibility.AccessibilityEventCompat Maven / Gradle / Ivy
/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.support.v4.view.accessibility;
import android.os.Build;
import android.view.accessibility.AccessibilityEvent;
/**
* Helper for accessing features in {@link AccessibilityEvent}
* introduced after API level 4 in a backwards compatible fashion.
*/
public class AccessibilityEventCompat {
static interface AccessibilityEventVersionImpl {
public int getRecordCount(AccessibilityEvent event);
public void appendRecord(AccessibilityEvent event, Object record);
public Object getRecord(AccessibilityEvent event, int index);
}
static class AccessibilityEventStubImpl implements AccessibilityEventVersionImpl {
public void appendRecord(AccessibilityEvent event, Object record) {
}
public Object getRecord(AccessibilityEvent event, int index) {
return null;
}
public int getRecordCount(AccessibilityEvent event) {
return 0;
}
}
static class AccessibilityEventIcsImpl extends AccessibilityEventStubImpl {
@Override
public void appendRecord(AccessibilityEvent event, Object record) {
AccessibilityEventCompatIcs.appendRecord(event, record);
}
@Override
public Object getRecord(AccessibilityEvent event, int index) {
return AccessibilityEventCompatIcs.getRecord(event, index);
}
@Override
public int getRecordCount(AccessibilityEvent event) {
return AccessibilityEventCompatIcs.getRecordCount(event);
}
}
private final static AccessibilityEventVersionImpl IMPL;
static {
if (Build.VERSION.SDK_INT >= 14) { // ICS
IMPL = new AccessibilityEventIcsImpl();
} else {
IMPL = new AccessibilityEventStubImpl();
}
}
/**
* Represents the event of a hover enter over a {@link android.view.View}.
*/
public static final int TYPE_VIEW_HOVER_ENTER = 0x00000080;
/**
* Represents the event of a hover exit over a {@link android.view.View}.
*/
public static final int TYPE_VIEW_HOVER_EXIT = 0x00000100;
/**
* Represents the event of starting a touch exploration gesture.
*/
public static final int TYPE_TOUCH_EXPLORATION_GESTURE_START = 0x00000200;
/**
* Represents the event of ending a touch exploration gesture.
*/
public static final int TYPE_TOUCH_EXPLORATION_GESTURE_END = 0x00000400;
/**
* Represents the event of changing the content of a window.
*/
public static final int TYPE_WINDOW_CONTENT_CHANGED = 0x00000800;
/**
* Represents the event of scrolling a view.
*/
public static final int TYPE_VIEW_SCROLLED = 0x00001000;
/**
* Represents the event of changing the selection in an {@link android.widget.EditText}.
*/
public static final int TYPE_VIEW_TEXT_SELECTION_CHANGED = 0x00002000;
/*
* Hide constructor from clients.
*/
private AccessibilityEventCompat() {
}
/**
* Gets the number of records contained in the event.
*
* @return The number of records.
*/
public static int getRecordCount(AccessibilityEvent event) {
return IMPL.getRecordCount(event);
}
/**
* Appends an {@link android.view.accessibility.AccessibilityRecord} to the end of
* event records.
*
* @param record The record to append.
*
* @throws IllegalStateException If called from an AccessibilityService.
*/
public static void appendRecord(AccessibilityEvent event, AccessibilityRecordCompat record) {
IMPL.appendRecord(event, record.getImpl());
}
/**
* Gets the record at a given index.
*
* @param index The index.
* @return The record at the specified index.
*/
public static AccessibilityRecordCompat getRecord(AccessibilityEvent event, int index) {
return new AccessibilityRecordCompat(IMPL.getRecord(event, index));
}
}
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