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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/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter_test/flutter_test.dart';
import 'rendering_tester.dart';
void main() {
test('ensure frame is scheduled for markNeedsSemanticsUpdate', () {
// Initialize all bindings because owner.flushSemantics() requires a window
renderer;
final TestRenderObject renderObject = TestRenderObject();
int onNeedVisualUpdateCallCount = 0;
final PipelineOwner owner = PipelineOwner(onNeedVisualUpdate: () {
onNeedVisualUpdateCallCount +=1;
});
owner.ensureSemantics();
renderObject.attach(owner);
renderObject.layout(const BoxConstraints.tightForFinite()); // semantics are only calculated if layout information is up to date.
owner.flushSemantics();
expect(onNeedVisualUpdateCallCount, 1);
renderObject.markNeedsSemanticsUpdate();
expect(onNeedVisualUpdateCallCount, 2);
});
test('detached RenderObject does not do semantics', () {
final TestRenderObject renderObject = TestRenderObject();
expect(renderObject.attached, isFalse);
expect(renderObject.describeSemanticsConfigurationCallCount, 0);
renderObject.markNeedsSemanticsUpdate();
expect(renderObject.describeSemanticsConfigurationCallCount, 0);
});
test('ensure errors processing render objects are well formatted', () {
FlutterErrorDetails errorDetails;
final FlutterExceptionHandler oldHandler = FlutterError.onError;
FlutterError.onError = (FlutterErrorDetails details) {
errorDetails = details;
};
final PipelineOwner owner = PipelineOwner();
final TestThrowingRenderObject renderObject = TestThrowingRenderObject();
try {
renderObject.attach(owner);
renderObject.layout(const BoxConstraints());
} finally {
FlutterError.onError = oldHandler;
}
expect(errorDetails, isNotNull);
expect(errorDetails.stack, isNotNull);
// Check the ErrorDetails without the stack trace
final List<String> lines = errorDetails.toString().split('\n');
// The lines in the middle of the error message contain the stack trace
// which will change depending on where the test is run.
expect(lines.length, greaterThan(8));
expect(
lines.take(4).join('\n'),
equalsIgnoringHashCodes(
'══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞══════════════════════\n'
'The following assertion was thrown during performLayout():\n'
'TestThrowingRenderObject does not support performLayout.\n'
),
);
expect(
lines.getRange(lines.length - 8, lines.length).join('\n'),
equalsIgnoringHashCodes(
'\n'
'The following RenderObject was being processed when the exception was fired:\n'
' TestThrowingRenderObject#00000 NEEDS-PAINT:\n'
' parentData: MISSING\n'
' constraints: BoxConstraints(unconstrained)\n'
'This RenderObject has no descendants.\n'
'═════════════════════════════════════════════════════════════════\n'
),
);
});
test('ContainerParentDataMixin requires nulled out pointers to siblings before detach', () {
expect(() => TestParentData().detach(), isNot(throwsAssertionError));
final TestParentData data1 = TestParentData()
..nextSibling = RenderOpacity()
..previousSibling = RenderOpacity();
expect(() => data1.detach(), throwsAssertionError);
final TestParentData data2 = TestParentData()
..previousSibling = RenderOpacity();
expect(() => data2.detach(), throwsAssertionError);
final TestParentData data3 = TestParentData()
..nextSibling = RenderOpacity();
expect(() => data3.detach(), throwsAssertionError);
});
test('PaintingContext.pushClipRect reuses the layer', () {
_testPaintingContextLayerReuse<ClipRectLayer>((PaintingContextCallback painter, PaintingContext context, Offset offset, Layer oldLayer) {
return context.pushClipRect(true, offset, Rect.zero, painter, oldLayer: oldLayer as ClipRectLayer);
});
});
test('PaintingContext.pushClipRRect reuses the layer', () {
_testPaintingContextLayerReuse<ClipRRectLayer>((PaintingContextCallback painter, PaintingContext context, Offset offset, Layer oldLayer) {
return context.pushClipRRect(true, offset, Rect.zero, RRect.fromRectAndRadius(Rect.zero, const Radius.circular(1.0)), painter, oldLayer: oldLayer as ClipRRectLayer);
});
});
test('PaintingContext.pushClipPath reuses the layer', () {
_testPaintingContextLayerReuse<ClipPathLayer>((PaintingContextCallback painter, PaintingContext context, Offset offset, Layer oldLayer) {
return context.pushClipPath(true, offset, Rect.zero, Path(), painter, oldLayer: oldLayer as ClipPathLayer);
});
});
test('PaintingContext.pushColorFilter reuses the layer', () {
_testPaintingContextLayerReuse<ColorFilterLayer>((PaintingContextCallback painter, PaintingContext context, Offset offset, Layer oldLayer) {
return context.pushColorFilter(offset, const ColorFilter.mode(Color.fromRGBO(0, 0, 0, 1.0), BlendMode.clear), painter, oldLayer: oldLayer as ColorFilterLayer);
});
});
test('PaintingContext.pushTransform reuses the layer', () {
_testPaintingContextLayerReuse<TransformLayer>((PaintingContextCallback painter, PaintingContext context, Offset offset, Layer oldLayer) {
return context.pushTransform(true, offset, Matrix4.identity(), painter, oldLayer: oldLayer as TransformLayer);
});
});
test('PaintingContext.pushOpacity reuses the layer', () {
_testPaintingContextLayerReuse<OpacityLayer>((PaintingContextCallback painter, PaintingContext context, Offset offset, Layer oldLayer) {
return context.pushOpacity(offset, 100, painter, oldLayer: oldLayer as OpacityLayer);
});
});
}
// Tests the create-update cycle by pumping two frames. The first frame has no
// prior layer and forces the painting context to create a new one. The second
// frame reuses the layer painted on the first frame.
void _testPaintingContextLayerReuse<L extends Layer>(_LayerTestPaintCallback painter) {
final _TestCustomLayerBox box = _TestCustomLayerBox(painter);
layout(box, phase: EnginePhase.paint);
// Force a repaint. Otherwise, pumpFrame is a noop.
box.markNeedsPaint();
pumpFrame(phase: EnginePhase.paint);
expect(box.paintedLayers, hasLength(2));
expect(box.paintedLayers[0], isInstanceOf<L>());
expect(box.paintedLayers[0], same(box.paintedLayers[1]));
}
typedef _LayerTestPaintCallback = Layer Function(PaintingContextCallback painter, PaintingContext context, Offset offset, Layer oldLayer);
class _TestCustomLayerBox extends RenderBox {
_TestCustomLayerBox(this.painter);
final _LayerTestPaintCallback painter;
final List<Layer> paintedLayers = <Layer>[];
@override
bool get isRepaintBoundary => false;
@override
void performLayout() {
size = constraints.smallest;
}
@override
void paint(PaintingContext context, Offset offset) {
final Layer paintedLayer = painter(super.paint, context, offset, layer);
paintedLayers.add(paintedLayer);
layer = paintedLayer as ContainerLayer;
}
}
class TestParentData extends ParentData with ContainerParentDataMixin<RenderBox> { }
class TestRenderObject extends RenderObject {
@override
void debugAssertDoesMeetConstraints() { }
@override
Rect get paintBounds => null;
@override
void performLayout() { }
@override
void performResize() { }
@override
Rect get semanticBounds => const Rect.fromLTWH(0.0, 0.0, 10.0, 20.0);
int describeSemanticsConfigurationCallCount = 0;
@override
void describeSemanticsConfiguration(SemanticsConfiguration config) {
super.describeSemanticsConfiguration(config);
config.isSemanticBoundary = true;
describeSemanticsConfigurationCallCount++;
}
}
class TestThrowingRenderObject extends RenderObject {
@override
void performLayout() {
throw FlutterError('TestThrowingRenderObject does not support performLayout.');
}
@override
void debugAssertDoesMeetConstraints() { }
@override
Rect get paintBounds => null;
@override
void performResize() { }
@override
Rect get semanticBounds => null;
}