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/*
* Copyright (C) 2019 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 com.android.keyguard.clock;
import android.annotation.Nullable;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.os.Handler;
import android.os.Looper;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import java.util.concurrent.Callable;
import java.util.concurrent.FutureTask;
/**
* Creates a preview image ({@link Bitmap}) of a {@link View} for a custom clock face.
*/
final class ViewPreviewer {
private static final String TAG = "ViewPreviewer";
/**
* Handler used to run {@link View#draw(Canvas)} on the main thread.
*/
private final Handler mMainHandler = new Handler(Looper.getMainLooper());
/**
* Generate a realistic preview of a clock face.
*
* @param view view is used to generate preview image.
* @param width width of the preview image, should be the same as device width in pixels.
* @param height height of the preview image, should be the same as device height in pixels.
* @return bitmap of view.
*/
@Nullable
Bitmap createPreview(View view, int width, int height) {
if (view == null) {
return null;
}
FutureTask<Bitmap> task = new FutureTask<>(new Callable<Bitmap>() {
@Override
public Bitmap call() {
Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
// Draw clock view hierarchy to canvas.
Canvas canvas = new Canvas(bitmap);
canvas.drawColor(Color.BLACK);
dispatchVisibilityAggregated(view, true);
view.measure(View.MeasureSpec.makeMeasureSpec(width, View.MeasureSpec.EXACTLY),
View.MeasureSpec.makeMeasureSpec(height, View.MeasureSpec.EXACTLY));
view.layout(0, 0, width, height);
view.draw(canvas);
return bitmap;
}
});
if (Looper.myLooper() == Looper.getMainLooper()) {
task.run();
} else {
mMainHandler.post(task);
}
try {
return task.get();
} catch (Exception e) {
Log.e(TAG, "Error completing task", e);
return null;
}
}
private void dispatchVisibilityAggregated(View view, boolean isVisible) {
// Similar to View.dispatchVisibilityAggregated implementation.
final boolean thisVisible = view.getVisibility() == View.VISIBLE;
if (thisVisible || !isVisible) {
view.onVisibilityAggregated(isVisible);
}
if (view instanceof ViewGroup) {
isVisible = thisVisible && isVisible;
ViewGroup vg = (ViewGroup) view;
int count = vg.getChildCount();
for (int i = 0; i < count; i++) {
dispatchVisibilityAggregated(vg.getChildAt(i), isVisible);
}
}
}
}
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