1 /* 2 * Copyright (C) 2021 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.launcher3.widget; 17 18 import android.graphics.Bitmap; 19 import android.os.CancellationSignal; 20 import android.util.Size; 21 22 import androidx.annotation.NonNull; 23 import androidx.annotation.UiThread; 24 25 import com.android.launcher3.BaseActivity; 26 import com.android.launcher3.model.WidgetItem; 27 28 /** Asynchronous loader of preview bitmaps for {@link WidgetItem}s. */ 29 public interface WidgetPreviewLoader { 30 /** 31 * Loads a widget preview and calls back to {@code callback} when complete. 32 * 33 * @return a {@link CancellationSignal} which can be used to cancel the request. 34 */ 35 @NonNull 36 @UiThread loadPreview( @onNull BaseActivity activity, @NonNull WidgetItem item, @NonNull Size previewSize, @NonNull WidgetPreviewLoadedCallback callback)37 CancellationSignal loadPreview( 38 @NonNull BaseActivity activity, 39 @NonNull WidgetItem item, 40 @NonNull Size previewSize, 41 @NonNull WidgetPreviewLoadedCallback callback); 42 43 /** Callback class for requests to {@link WidgetPreviewLoader}. */ 44 interface WidgetPreviewLoadedCallback { onPreviewLoaded(@onNull Bitmap preview)45 void onPreviewLoaded(@NonNull Bitmap preview); 46 } 47 } 48