1 /*
2  * Copyright (C) 2017 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 package com.android.wallpaper.picker;
17 
18 import androidx.annotation.Nullable;
19 
20 /**
21  * Interface for a class which presents (in UI) a collection of wallpapers.
22  */
23 public interface WallpapersUiContainer {
24     /**
25      * Notifies the container that wallpapers are ready to display.
26      */
onWallpapersReady()27     void onWallpapersReady();
28 
29     /**
30      * Returns the {@link CategoryFragment} used by this container to display wallpaper
31      * categories, or {@code null} if none is available.
32      */
33     @Nullable
getCategoryFragment()34     CategoryFragment getCategoryFragment();
35 
36     /**
37      * Notifies the container that categories have been fetched.
38      */
doneFetchingCategories()39     void doneFetchingCategories();
40 }
41