1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of 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,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.tv.dialog;
18
19import android.app.Activity;
20import android.app.DialogFragment;
21
22/**
23 * Provides the safe dismiss feature regardless of the DialogFragment's life cycle.
24 */
25public class SafeDismissDialogFragment extends DialogFragment {
26    private boolean mAttached = false;
27    private boolean mDismissPending = false;
28
29    @Override
30    public void onAttach(Activity activity) {
31        super.onAttach(activity);
32        mAttached = true;
33        if (mDismissPending) {
34            mDismissPending = false;
35            dismiss();
36            return;
37        }
38    }
39
40    @Override
41    public void onDetach() {
42        mAttached = false;
43        super.onDetach();
44    }
45
46    /**
47     * Dismiss safely regardless of the DialogFragment's life cycle.
48     */
49    @Override
50    public void dismiss() {
51        if (!mAttached) {
52            // dismiss() before getFragmentManager() is set cause NPE in dismissInternal().
53            // FragmentMananager is set when a fragment is used in a trasaction,
54            // so wait here until we can dismiss safely.
55            mDismissPending = true;
56        } else {
57            super.dismiss();
58        }
59    }
60}
61