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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';
import 'package:flutter/rendering.dart';
import 'package:flutter/scheduler.dart';
import 'package:flutter/services.dart';
enum EnginePhase {
layout,
compositingBits,
paint,
composite,
flushSemantics
}
class TestRenderingFlutterBinding extends BindingBase with SchedulerBinding, ServicesBinding, RendererBinding, GestureBinding {
EnginePhase phase = EnginePhase.composite;
@override
void beginFrame() {
pipelineOwner.flushLayout();
if (phase == EnginePhase.layout)
return;
pipelineOwner.flushCompositingBits();
if (phase == EnginePhase.compositingBits)
return;
pipelineOwner.flushPaint();
if (phase == EnginePhase.paint)
return;
renderView.compositeFrame();
if (phase == EnginePhase.composite)
return;
pipelineOwner.flushSemantics();
assert(phase == EnginePhase.flushSemantics);
}
}
TestRenderingFlutterBinding _renderer;
TestRenderingFlutterBinding get renderer {
_renderer ??= new TestRenderingFlutterBinding();
return _renderer;
}
/// Place the box in the render tree, at the given size and with the given
/// alignment on the screen.
void layout(RenderBox box, {
BoxConstraints constraints,
FractionalOffset alignment: FractionalOffset.center,
EnginePhase phase: EnginePhase.layout
}) {
assert(box != null); // If you want to just repump the last box, call pumpFrame().
assert(box.parent == null); // We stick the box in another, so you can't reuse it easily, sorry.
renderer.renderView.child = null;
if (constraints != null) {
box = new RenderPositionedBox(
alignment: alignment,
child: new RenderConstrainedBox(
additionalConstraints: constraints,
child: box
)
);
}
renderer.renderView.child = box;
pumpFrame(phase: phase);
}
void pumpFrame({ EnginePhase phase: EnginePhase.layout }) {
assert(renderer != null);
renderer.phase = phase;
renderer.beginFrame();
}
class TestCallbackPainter extends CustomPainter {
const TestCallbackPainter({ this.onPaint });
final VoidCallback onPaint;
@override
void paint(Canvas canvas, Size size) {
onPaint();
}
@override
bool shouldRepaint(TestCallbackPainter oldPainter) => true;
}
class RenderSizedBox extends RenderBox {
RenderSizedBox(this._size);
final Size _size;
@override
double computeMinIntrinsicWidth(double height) {
return _size.width;
}
@override
double computeMaxIntrinsicWidth(double height) {
return _size.width;
}
@override
double computeMinIntrinsicHeight(double width) {
return _size.height;
}
@override
double computeMaxIntrinsicHeight(double width) {
return _size.height;
}
@override
bool get sizedByParent => true;
@override
void performResize() {
size = constraints.constrain(_size);
}
@override
void performLayout() { }
}