3e916982c4
Example:
import 'package:sky/widgets.dart';
void main() => runApp(new Center(child:
new StatisticsOverlay.allEnabled()));
61 lines
2.7 KiB
Dart
61 lines
2.7 KiB
Dart
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:sky/src/widgets/framework.dart';
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import 'package:sky/src/rendering/statistics_box.dart';
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/// The options that control whether the statistics overlay displays certain
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/// aspects of the compositor
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enum StatisticsOption {
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/// Display the frame time and FPS of the last frame rendered. This field is
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/// updated every frame.
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///
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/// This is the time spent by the rasterizer as it tries
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/// to convert the layer tree obtained from the widgets into OpenGL commands
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/// and tries to flush them onto the screen. When the total time taken by this
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/// step exceeds the frame slice, a frame is lost.
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displayRasterizerStatistics,
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/// Display the rasterizer frame times as they change over a set period of
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/// time in the form of a graph. The y axis of the graph denotes the total
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/// time spent by the rasterizer as a fraction of the total frame slice. When
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/// the bar turns red, a frame is lost.
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visualizeRasterizerStatistics,
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/// Display the frame time and FPS at which the interface can construct a
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/// layer tree for the rasterizer (whose behavior is described above) to
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/// consume.
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///
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/// This involves all layout, animations, etc. When the total time taken by
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/// this step exceeds the frame slice, a frame is lost.
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displayEngineStatistics,
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/// Display the engine frame times as they change over a set period of time
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/// in the form of a graph. The y axis of the graph denotes the total time
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/// spent by the eninge as a fraction of the total frame slice. When the bar
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/// turns red, a frame is lost.
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visualizeEngineStatistics,
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}
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class StatisticsOverlay extends LeafRenderObjectWidget {
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/// Create a statistics overlay that only displays specific statistics. The
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/// mask is created by shifting 1 by the index of the specific StatisticOption
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/// to enable.
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StatisticsOverlay({ this.optionsMask, Key key }) : super(key: key);
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/// Create a statistics overaly that displays all available statistics
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StatisticsOverlay.allEnabled({ Key key }) : super(key: key), optionsMask = (
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1 << StatisticsOption.displayRasterizerStatistics.index |
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1 << StatisticsOption.visualizeRasterizerStatistics.index |
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1 << StatisticsOption.displayEngineStatistics.index |
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1 << StatisticsOption.visualizeEngineStatistics.index
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);
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final int optionsMask;
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StatisticsBox createRenderObject() => new StatisticsBox(optionsMask: optionsMask);
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void updateRenderObject(StatisticsBox renderObject, RenderObjectWidget oldWidget) {
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renderObject.optionsMask = optionsMask;
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}
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}
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