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ab01c7bf73
Use the same technique for updating compositing bits as layout and painting. This avoids walking the entire rendering tree when all you need to update is a small subtree.
92 lines
2.3 KiB
Dart
92 lines
2.3 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:flutter/gestures.dart';
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import 'package:flutter/rendering.dart';
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import 'package:flutter/scheduler.dart';
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import 'package:flutter/services.dart';
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const Size _kTestViewSize = const Size(800.0, 600.0);
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class TestRenderView extends RenderView {
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TestRenderView() {
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rootConstraints = new ViewConstraints(size: _kTestViewSize);
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}
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void scheduleInitialFrame() {
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scheduleInitialLayout();
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scheduleInitialPaint(new TransformLayer(transform: new Matrix4.identity()));
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}
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}
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enum EnginePhase {
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layout,
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compositingBits,
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paint,
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composite
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}
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class TestRenderingFlutterBinding extends BindingBase with Scheduler, Renderer, Gesturer {
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void initRenderView() {
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if (renderView == null) {
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renderView = new TestRenderView();
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renderView.scheduleInitialFrame();
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}
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}
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EnginePhase phase = EnginePhase.composite;
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void beginFrame() {
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RenderObject.flushLayout();
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if (phase == EnginePhase.layout)
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return;
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RenderObject.flushCompositingBits();
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if (phase == EnginePhase.compositingBits)
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return;
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RenderObject.flushPaint();
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if (phase == EnginePhase.paint)
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return;
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renderer.renderView.compositeFrame();
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}
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}
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TestRenderingFlutterBinding _renderer;
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TestRenderingFlutterBinding get renderer => _renderer;
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void layout(RenderBox box, { BoxConstraints constraints, EnginePhase phase: EnginePhase.layout }) {
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assert(box != null); // if you want to just repump the last box, call pumpFrame().
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_renderer ??= new TestRenderingFlutterBinding();
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renderer.renderView.child = null;
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if (constraints != null) {
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box = new RenderPositionedBox(
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child: new RenderConstrainedBox(
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additionalConstraints: constraints,
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child: box
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)
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);
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}
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renderer.renderView.child = box;
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pumpFrame(phase: phase);
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}
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void pumpFrame({ EnginePhase phase: EnginePhase.layout }) {
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assert(renderer != null);
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renderer.phase = phase;
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renderer.beginFrame();
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}
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class TestCallbackPainter extends CustomPainter {
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const TestCallbackPainter({ this.onPaint });
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final VoidCallback onPaint;
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void paint(Canvas canvas, Size size) {
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onPaint();
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}
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bool shouldRepaint(TestCallbackPainter oldPainter) => true;
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}
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