/*
* Copyright (C) 2016 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.v13.view;
import static android.support.annotation.RestrictTo.Scope.LIBRARY_GROUP;
import android.annotation.TargetApi;
import android.app.Activity;
import android.support.annotation.RequiresApi;
import android.support.annotation.RestrictTo;
import android.support.v4.os.BuildCompat;
import android.view.DragEvent;
/**
* Helper for accessing features in {@link android.view.DragAndDropPermissions}
* introduced after API level 13 in a backwards compatible fashion.
*/
@RequiresApi(13)
@TargetApi(13)
public final class DragAndDropPermissionsCompat {
interface DragAndDropPermissionsCompatImpl {
Object request(Activity activity, DragEvent dragEvent);
void release(Object dragAndDropPermissions);
}
static class BaseDragAndDropPermissionsCompatImpl implements DragAndDropPermissionsCompatImpl {
@Override
public Object request(Activity activity, DragEvent dragEvent) {
return null;
}
@Override
public void release(Object dragAndDropPermissions) {
// no-op
}
}
static class Api24DragAndDropPermissionsCompatImpl
extends BaseDragAndDropPermissionsCompatImpl {
@Override
public Object request(Activity activity, DragEvent dragEvent) {
return DragAndDropPermissionsCompatApi24.request(activity, dragEvent);
}
@Override
public void release(Object dragAndDropPermissions) {
DragAndDropPermissionsCompatApi24.release(dragAndDropPermissions);
}
}
private static DragAndDropPermissionsCompatImpl IMPL;
static {
if (BuildCompat.isAtLeastN()) {
IMPL = new Api24DragAndDropPermissionsCompatImpl();
} else {
IMPL = new BaseDragAndDropPermissionsCompatImpl();
}
}
private Object mDragAndDropPermissions;
private DragAndDropPermissionsCompat(Object dragAndDropPermissions) {
mDragAndDropPermissions = dragAndDropPermissions;
}
/** @hide */
@RestrictTo(LIBRARY_GROUP)
public static DragAndDropPermissionsCompat request(Activity activity, DragEvent dragEvent) {
Object dragAndDropPermissions = IMPL.request(activity, dragEvent);
if (dragAndDropPermissions != null) {
return new DragAndDropPermissionsCompat(dragAndDropPermissions);
}
return null;
}
/*
* Revoke the permission grant explicitly.
*/
public void release() {
IMPL.release(mDragAndDropPermissions);
}
}