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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 TestTree {
TestTree() {
// incoming constraints are tight 800x600
root = RenderPositionedBox(
child: RenderConstrainedBox(
additionalConstraints: const BoxConstraints.tightFor(width: 800.0),
// Place the child to be evaluated within both a repaint boundary and a
// layout-root element (in this case a tightly constrained box). Otherwise
// the act of transplanting the root into a new container will cause the
// relayout/repaint of the new parent node to satisfy the test.
child: RenderRepaintBoundary(
child: RenderConstrainedBox(
additionalConstraints: const BoxConstraints.tightFor(height: 20.0, width: 20.0),
child: RenderRepaintBoundary(
child: RenderCustomPaint(
painter: TestCallbackPainter(
onPaint: () { painted = true; },
),
child: RenderPositionedBox(
child: child = RenderConstrainedBox(
additionalConstraints: const BoxConstraints.tightFor(height: 20.0, width: 20.0),
child: RenderSemanticsAnnotations(
textDirection: TextDirection.ltr,
properties: const SemanticsProperties(label: 'Hello there foo'),
),
),
),
),
),
),
),
),
);
}
late RenderBox root;
late RenderConstrainedBox child;
bool painted = false;
}
class MutableCompositor extends RenderProxyBox {
MutableCompositor({ required RenderBox child }) : super(child);
bool _alwaysComposite = false;
@override
bool get alwaysNeedsCompositing => _alwaysComposite;
}
class TestCompositingBitsTree {
TestCompositingBitsTree() {
// incoming constraints are tight 800x600
root = RenderPositionedBox(
child: RenderConstrainedBox(
additionalConstraints: const BoxConstraints.tightFor(width: 800.0),
// Place the child to be evaluated within a repaint boundary. Otherwise
// the act of transplanting the root into a new container will cause the
// repaint of the new parent node to satisfy the test.
child: RenderRepaintBoundary(
child: compositor = MutableCompositor(
child: RenderCustomPaint(
painter: TestCallbackPainter(
onPaint: () { painted = true; },
),
child: child = RenderConstrainedBox(
additionalConstraints: const BoxConstraints.tightFor(height: 20.0, width: 20.0),
),
),
),
),
),
);
}
late RenderBox root;
late MutableCompositor compositor;
late RenderConstrainedBox child;
bool painted = false;
}
void main() {
TestRenderingFlutterBinding.ensureInitialized();
test('objects can be detached and re-attached: layout', () {
final TestTree testTree = TestTree();
// Lay out
layout(testTree.root);
expect(testTree.child.size, equals(const Size(20.0, 20.0)));
// Remove testTree from the custom render view
TestRenderingFlutterBinding.instance.renderView.child = null;
expect(testTree.child.owner, isNull);
// Dirty one of the elements
testTree.child.additionalConstraints =
const BoxConstraints.tightFor(height: 5.0, width: 5.0);
// Lay out again
layout(testTree.root);
expect(testTree.child.size, equals(const Size(5.0, 5.0)));
});
test('objects can be detached and re-attached: compositingBits', () {
final TestCompositingBitsTree testTree = TestCompositingBitsTree();
// Lay out, composite, and paint
layout(testTree.root, phase: EnginePhase.paint);
expect(testTree.painted, isTrue);
// Remove testTree from the custom render view
TestRenderingFlutterBinding.instance.renderView.child = null;
expect(testTree.child.owner, isNull);
// Dirty one of the elements
testTree.compositor._alwaysComposite = true;
testTree.child.markNeedsCompositingBitsUpdate();
testTree.painted = false;
// Lay out, composite, and paint again
layout(testTree.root, phase: EnginePhase.paint);
expect(testTree.painted, isTrue);
});
test('objects can be detached and re-attached: paint', () {
final TestTree testTree = TestTree();
// Lay out, composite, and paint
layout(testTree.root, phase: EnginePhase.paint);
expect(testTree.painted, isTrue);
// Remove testTree from the custom render view
TestRenderingFlutterBinding.instance.renderView.child = null;
expect(testTree.child.owner, isNull);
// Dirty one of the elements
testTree.child.markNeedsPaint();
testTree.painted = false;
// Lay out, composite, and paint again
layout(testTree.root, phase: EnginePhase.paint);
expect(testTree.painted, isTrue);
});
test('objects can be detached and re-attached: semantics (no change)', () {
final TestTree testTree = TestTree();
int semanticsUpdateCount = 0;
final SemanticsHandle semanticsHandle = TestRenderingFlutterBinding.instance.pipelineOwner.ensureSemantics(
listener: () {
++semanticsUpdateCount;
},
);
// Lay out, composite, paint, and update semantics
layout(testTree.root, phase: EnginePhase.flushSemantics);
expect(semanticsUpdateCount, 1);
// Remove testTree from the custom render view
TestRenderingFlutterBinding.instance.renderView.child = null;
expect(testTree.child.owner, isNull);
// Dirty one of the elements
semanticsUpdateCount = 0;
testTree.child.markNeedsSemanticsUpdate();
expect(semanticsUpdateCount, 0);
// Lay out, composite, paint, and update semantics again
layout(testTree.root, phase: EnginePhase.flushSemantics);
expect(semanticsUpdateCount, 0); // no semantics have changed.
semanticsHandle.dispose();
});
test('objects can be detached and re-attached: semantics (with change)', () {
final TestTree testTree = TestTree();
int semanticsUpdateCount = 0;
final SemanticsHandle semanticsHandle = TestRenderingFlutterBinding.instance.pipelineOwner.ensureSemantics(
listener: () {
++semanticsUpdateCount;
},
);
// Lay out, composite, paint, and update semantics
layout(testTree.root, phase: EnginePhase.flushSemantics);
expect(semanticsUpdateCount, 1);
// Remove testTree from the custom render view
TestRenderingFlutterBinding.instance.renderView.child = null;
expect(testTree.child.owner, isNull);
// Dirty one of the elements
semanticsUpdateCount = 0;
testTree.child.additionalConstraints = const BoxConstraints.tightFor(height: 20.0, width: 30.0);
testTree.child.markNeedsSemanticsUpdate();
expect(semanticsUpdateCount, 0);
// Lay out, composite, paint, and update semantics again
layout(testTree.root, phase: EnginePhase.flushSemantics);
expect(semanticsUpdateCount, 1); // semantics have changed.
semanticsHandle.dispose();
});
}