rendering_tester.dart 2.33 KB
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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'package:flutter/gestures.dart';
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import 'package:flutter/rendering.dart';
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import 'package:flutter/scheduler.dart';
import 'package:flutter/services.dart';
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const Size _kTestViewSize = const Size(800.0, 600.0);

class TestRenderView extends RenderView {
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  TestRenderView() {
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    configuration = new ViewConfiguration(size: _kTestViewSize);
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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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}

enum EnginePhase {
  layout,
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  compositingBits,
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  paint,
  composite
}

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class TestRenderingFlutterBinding extends BindingBase with Scheduler, Services, Renderer, Gesturer {
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  void initRenderView() {
    if (renderView == null) {
      renderView = new TestRenderView();
      renderView.scheduleInitialFrame();
    }
  }

  EnginePhase phase = EnginePhase.composite;

  void beginFrame() {
    RenderObject.flushLayout();
    if (phase == EnginePhase.layout)
      return;
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    RenderObject.flushCompositingBits();
    if (phase == EnginePhase.compositingBits)
      return;
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    RenderObject.flushPaint();
    if (phase == EnginePhase.paint)
      return;
    renderer.renderView.compositeFrame();
  }
}

TestRenderingFlutterBinding _renderer;
TestRenderingFlutterBinding get renderer => _renderer;
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void layout(RenderBox box, { BoxConstraints constraints, EnginePhase phase: EnginePhase.layout }) {
  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) {
    box = new RenderPositionedBox(
      child: new RenderConstrainedBox(
        additionalConstraints: constraints,
        child: box
      )
    );
  }
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  renderer.renderView.child = box;
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  pumpFrame(phase: phase);
}

void pumpFrame({ EnginePhase phase: EnginePhase.layout }) {
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  assert(renderer != null);
  renderer.phase = phase;
  renderer.beginFrame();
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}
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class TestCallbackPainter extends CustomPainter {
  const TestCallbackPainter({ this.onPaint });

  final VoidCallback onPaint;

  void paint(Canvas canvas, Size size) {
    onPaint();
  }

  bool shouldRepaint(TestCallbackPainter oldPainter) => true;
}