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/*
* Copyright (C) 2012 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.Bundle;
import android.view.View;
import java.util.List;
/**
* Helper for accessing {@link android.view.accessibility.AccessibilityNodeProvider}
* introduced after API level 4 in a backwards compatible fashion.
*/
public class AccessibilityNodeProviderCompat {
interface AccessibilityNodeProviderImpl {
public Object newAccessibilityNodeProviderBridge(AccessibilityNodeProviderCompat compat);
}
static class AccessibilityNodeProviderStubImpl implements AccessibilityNodeProviderImpl {
@Override
public Object newAccessibilityNodeProviderBridge(AccessibilityNodeProviderCompat compat) {
return null;
}
}
private static final AccessibilityNodeProviderImpl IMPL;
private final Object mProvider;
static {
IMPL = new AccessibilityNodeProviderStubImpl();
}
/**
* Creates a new instance.
*/
public AccessibilityNodeProviderCompat() {
mProvider = IMPL.newAccessibilityNodeProviderBridge(this);
}
/**
* Creates a new instance wrapping an
* {@link android.view.accessibility.AccessibilityNodeProvider}.
*
* @param provider The provider.
*/
public AccessibilityNodeProviderCompat(Object provider) {
mProvider = provider;
}
/**
* @return The wrapped {@link android.view.accessibility.AccessibilityNodeProvider}.
*/
public Object getProvider() {
return mProvider;
}
/**
* Returns an {@link AccessibilityNodeInfoCompat} representing a virtual view,
* i.e. a descendant of the host View, with the given <code>virtualViewId</code>
* or the host View itself if <code>virtualViewId</code> equals to {@link View#NO_ID}.
* <p>
* A virtual descendant is an imaginary View that is reported as a part of the view
* hierarchy for accessibility purposes. This enables custom views that draw complex
* content to report them selves as a tree of virtual views, thus conveying their
* logical structure.
* </p>
* <p>
* The implementer is responsible for obtaining an accessibility node info from the
* pool of reusable instances and setting the desired properties of the node info
* before returning it.
* </p>
*
* @param virtualViewId A client defined virtual view id.
* @return A populated {@link AccessibilityNodeInfoCompat} for a virtual descendant
* or the host View.
*
* @see AccessibilityNodeInfoCompat
*/
@SuppressWarnings("static-method")
public AccessibilityNodeInfoCompat createAccessibilityNodeInfo(int virtualViewId) {
return null;
}
/**
* Performs an accessibility action on a virtual view, i.e. a descendant of the
* host View, with the given <code>virtualViewId</code> or the host View itself
* if <code>virtualViewId</code> equals to {@link View#NO_ID}.
*
* @param virtualViewId A client defined virtual view id.
* @param action The action to perform.
* @param arguments Optional arguments.
* @return True if the action was performed.
*
* @see #createAccessibilityNodeInfo(int)
* @see AccessibilityNodeInfoCompat
*/
@SuppressWarnings("static-method")
public boolean performAction(int virtualViewId, int action, Bundle arguments) {
return false;
}
/**
* Finds {@link AccessibilityNodeInfoCompat}s by text. The match is case insensitive
* containment. The search is relative to the virtual view, i.e. a descendant of the
* host View, with the given <code>virtualViewId</code> or the host View itself
* <code>virtualViewId</code> equals to {@link View#NO_ID}.
*
* @param virtualViewId A client defined virtual view id which defined
* the root of the tree in which to perform the search.
* @param text The searched text.
* @return A list of node info.
*
* @see #createAccessibilityNodeInfo(int)
* @see AccessibilityNodeInfoCompat
*/
@SuppressWarnings("static-method")
public List<AccessibilityNodeInfoCompat> findAccessibilityNodeInfosByText(String text,
int virtualViewId) {
return null;
}
/**
* Find the virtual view, i.e. a descendant of the host View, that has the
* specified focus type.
*
* @param focus The focus to find. One of
* {@link AccessibilityNodeInfoCompat#FOCUS_INPUT} or
* {@link AccessibilityNodeInfoCompat#FOCUS_ACCESSIBILITY}.
* @return The node info of the focused view or null.
* @see AccessibilityNodeInfoCompat#FOCUS_INPUT
* @see AccessibilityNodeInfoCompat#FOCUS_ACCESSIBILITY
*/
@SuppressWarnings("static-method")
public AccessibilityNodeInfoCompat findFocus(int focus) {
return null;
}
}
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