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// Copyright 2014 The Flutter 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/rendering.dart';
import 'package:flutter_test/flutter_test.dart';
import 'rendering_tester.dart';
class TestLayout {
TestLayout() {
// incoming constraints are tight 800x600
root = RenderPositionedBox(
child: RenderConstrainedBox(
additionalConstraints: const BoxConstraints.tightFor(width: 800.0),
child: RenderCustomPaint(
painter: TestCallbackPainter(
onPaint: () { painted = true; },
),
child: child = RenderConstrainedBox(
additionalConstraints: const BoxConstraints.tightFor(height: 10.0, width: 10.0),
),
),
),
);
}
late RenderBox root;
late RenderBox child;
bool painted = false;
}
void main() {
TestRenderingFlutterBinding.ensureInitialized();
const ViewConfiguration testConfiguration = ViewConfiguration(
size: Size(800.0, 600.0),
);
test('onscreen layout does not affect offscreen', () {
final TestLayout onscreen = TestLayout();
final TestLayout offscreen = TestLayout();
expect(onscreen.child.hasSize, isFalse);
expect(onscreen.painted, isFalse);
expect(offscreen.child.hasSize, isFalse);
expect(offscreen.painted, isFalse);
// Attach the offscreen to a custom render view and owner
final RenderView renderView = RenderView(configuration: testConfiguration, view: RendererBinding.instance.platformDispatcher.views.single);
final PipelineOwner pipelineOwner = PipelineOwner();
renderView.attach(pipelineOwner);
renderView.child = offscreen.root;
renderView.prepareInitialFrame();
pipelineOwner.requestVisualUpdate();
// Lay out the onscreen in the default binding
layout(onscreen.root, phase: EnginePhase.paint);
expect(onscreen.child.hasSize, isTrue);
expect(onscreen.painted, isTrue);
expect(onscreen.child.size, equals(const Size(800.0, 10.0)));
// Make sure the offscreen didn't get laid out
expect(offscreen.child.hasSize, isFalse);
expect(offscreen.painted, isFalse);
// Now lay out the offscreen
pipelineOwner.flushLayout();
expect(offscreen.child.hasSize, isTrue);
expect(offscreen.painted, isFalse);
pipelineOwner.flushCompositingBits();
pipelineOwner.flushPaint();
expect(offscreen.painted, isTrue);
});
test('offscreen layout does not affect onscreen', () {
final TestLayout onscreen = TestLayout();
final TestLayout offscreen = TestLayout();
expect(onscreen.child.hasSize, isFalse);
expect(onscreen.painted, isFalse);
expect(offscreen.child.hasSize, isFalse);
expect(offscreen.painted, isFalse);
// Attach the offscreen to a custom render view and owner
final RenderView renderView = RenderView(configuration: testConfiguration, view: RendererBinding.instance.platformDispatcher.views.single);
final PipelineOwner pipelineOwner = PipelineOwner();
renderView.attach(pipelineOwner);
renderView.child = offscreen.root;
renderView.prepareInitialFrame();
pipelineOwner.requestVisualUpdate();
// Lay out the offscreen
pipelineOwner.flushLayout();
expect(offscreen.child.hasSize, isTrue);
expect(offscreen.painted, isFalse);
pipelineOwner.flushCompositingBits();
pipelineOwner.flushPaint();
expect(offscreen.painted, isTrue);
// Make sure the onscreen didn't get laid out
expect(onscreen.child.hasSize, isFalse);
expect(onscreen.painted, isFalse);
// Now lay out the onscreen in the default binding
layout(onscreen.root, phase: EnginePhase.paint);
expect(onscreen.child.hasSize, isTrue);
expect(onscreen.painted, isTrue);
expect(onscreen.child.size, equals(const Size(800.0, 10.0)));
});
}