| /* |
| * Copyright 2022 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 androidx.camera.previewview; |
| |
| import android.view.View; |
| import android.widget.FrameLayout; |
| |
| import androidx.annotation.NonNull; |
| import androidx.annotation.Nullable; |
| import androidx.annotation.RequiresApi; |
| |
| /** |
| * Wraps the underlying handling of the {@link android.view.Surface} used for preview, which is |
| * done using either a {@link android.view.TextureView} (see {@link TextureViewImplementation}) |
| * or a {@link android.view.SurfaceView} (see {@link SurfaceViewImplementation}). |
| */ |
| @RequiresApi(21) |
| abstract class PreviewViewImplementation { |
| |
| @NonNull |
| FrameLayout mParent; |
| |
| @SuppressWarnings("unused") |
| @NonNull |
| private final PreviewTransformation mPreviewTransform; |
| |
| @Nullable |
| abstract View getPreview(); |
| |
| PreviewViewImplementation(@NonNull FrameLayout parent, |
| @NonNull PreviewTransformation previewTransform) { |
| mParent = parent; |
| mPreviewTransform = previewTransform; |
| } |
| |
| /** |
| * Invoked when the preview needs to be adjusted, either because the layout bounds of the |
| * preview's container {@link CameraPreviewView} have changed, or the |
| * {@link CameraPreviewView.ScaleType} has changed. |
| * <p> |
| * Corrects and adjusts the preview using the latest {@link CameraPreviewView.ScaleType} and |
| * display properties such as the display orientation and size. |
| */ |
| void redrawPreview() {} |
| } |
