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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/animation.dart';
import 'package:meta/meta.dart';
import '../flutter_test_alternative.dart';
import 'rendering_tester.dart';
class TestRenderSliverBoxChildManager extends RenderSliverBoxChildManager {
TestRenderSliverBoxChildManager({
this.children,
});
RenderSliverList _renderObject;
List<RenderBox> children;
RenderSliverList createRenderObject() {
assert(_renderObject == null);
_renderObject = RenderSliverList(childManager: this);
return _renderObject;
}
int _currentlyUpdatingChildIndex;
@override
void createChild(int index, { @required RenderBox after }) {
if (index < 0 || index >= children.length)
return;
try {
_currentlyUpdatingChildIndex = index;
_renderObject.insert(children[index], after: after);
} finally {
_currentlyUpdatingChildIndex = null;
}
}
@override
void removeChild(RenderBox child) {
_renderObject.remove(child);
}
@override
double estimateMaxScrollOffset(
SliverConstraints constraints, {
int firstIndex,
int lastIndex,
double leadingScrollOffset,
double trailingScrollOffset,
}) {
assert(lastIndex >= firstIndex);
return children.length * (trailingScrollOffset - leadingScrollOffset) / (lastIndex - firstIndex + 1);
}
@override
int get childCount => children.length;
@override
void didAdoptChild(RenderBox child) {
assert(_currentlyUpdatingChildIndex != null);
final SliverMultiBoxAdaptorParentData childParentData = child.parentData as SliverMultiBoxAdaptorParentData;
childParentData.index = _currentlyUpdatingChildIndex;
}
@override
void setDidUnderflow(bool value) { }
}
class ViewportOffsetSpy extends ViewportOffset {
ViewportOffsetSpy(this._pixels);
double _pixels;
@override
double get pixels => _pixels;
bool corrected = false;
@override
bool applyViewportDimension(double viewportDimension) => true;
@override
bool applyContentDimensions(double minScrollExtent, double maxScrollExtent) => true;
@override
void correctBy(double correction) {
_pixels += correction;
corrected = true;
}
@override
void jumpTo(double pixels) {
// Do nothing, not required in test.
}
@override
Future<void> animateTo(
double to, {
@required Duration duration,
@required Curve curve,
}) async {
// Do nothing, not required in test.
}
@override
ScrollDirection get userScrollDirection => ScrollDirection.idle;
@override
bool get allowImplicitScrolling => false;
}
void main() {
test('RenderSliverList basic test - down', () {
RenderObject inner;
RenderBox a, b, c, d, e;
final TestRenderSliverBoxChildManager childManager = TestRenderSliverBoxChildManager(
children: <RenderBox>[
a = RenderSizedBox(const Size(100.0, 400.0)),
b = RenderSizedBox(const Size(100.0, 400.0)),
c = RenderSizedBox(const Size(100.0, 400.0)),
d = RenderSizedBox(const Size(100.0, 400.0)),
e = RenderSizedBox(const Size(100.0, 400.0)),
],
);
final RenderViewport root = RenderViewport(
axisDirection: AxisDirection.down,
crossAxisDirection: AxisDirection.right,
offset: ViewportOffset.zero(),
cacheExtent: 0.0,
children: <RenderSliver>[
inner = childManager.createRenderObject(),
],
);
layout(root);
expect(root.size.width, equals(800.0));
expect(root.size.height, equals(600.0));
expect(a.localToGlobal(const Offset(0.0, 0.0)), const Offset(0.0, 0.0));
expect(b.localToGlobal(const Offset(0.0, 0.0)), const Offset(0.0, 400.0));
expect(c.attached, false);
expect(d.attached, false);
expect(e.attached, false);
// make sure that layout is stable by laying out again
inner.markNeedsLayout();
pumpFrame();
expect(a.localToGlobal(const Offset(0.0, 0.0)), const Offset(0.0, 0.0));
expect(b.localToGlobal(const Offset(0.0, 0.0)), const Offset(0.0, 400.0));
expect(c.attached, false);
expect(d.attached, false);
expect(e.attached, false);
// now try various scroll offsets
root.offset = ViewportOffset.fixed(200.0);
pumpFrame();
expect(a.localToGlobal(const Offset(0.0, 0.0)), const Offset(0.0, -200.0));
expect(b.localToGlobal(const Offset(0.0, 0.0)), const Offset(0.0, 200.0));
expect(c.attached, false);
expect(d.attached, false);
expect(e.attached, false);
root.offset = ViewportOffset.fixed(600.0);
pumpFrame();
expect(a.attached, false);
expect(b.localToGlobal(const Offset(0.0, 0.0)), const Offset(0.0, -200.0));
expect(c.localToGlobal(const Offset(0.0, 0.0)), const Offset(0.0, 200.0));
expect(d.attached, false);
expect(e.attached, false);
root.offset = ViewportOffset.fixed(900.0);
pumpFrame();
expect(a.attached, false);
expect(b.attached, false);
expect(c.localToGlobal(const Offset(0.0, 0.0)), const Offset(0.0, -100.0));
expect(d.localToGlobal(const Offset(0.0, 0.0)), const Offset(0.0, 300.0));
expect(e.attached, false);
// try going back up
root.offset = ViewportOffset.fixed(200.0);
pumpFrame();
expect(a.localToGlobal(const Offset(0.0, 0.0)), const Offset(0.0, -200.0));
expect(b.localToGlobal(const Offset(0.0, 0.0)), const Offset(0.0, 200.0));
expect(c.attached, false);
expect(d.attached, false);
expect(e.attached, false);
});
test('RenderSliverList basic test - up', () {
RenderObject inner;
RenderBox a, b, c, d, e;
final TestRenderSliverBoxChildManager childManager = TestRenderSliverBoxChildManager(
children: <RenderBox>[
a = RenderSizedBox(const Size(100.0, 400.0)),
b = RenderSizedBox(const Size(100.0, 400.0)),
c = RenderSizedBox(const Size(100.0, 400.0)),
d = RenderSizedBox(const Size(100.0, 400.0)),
e = RenderSizedBox(const Size(100.0, 400.0)),
],
);
final RenderViewport root = RenderViewport(
axisDirection: AxisDirection.up,
crossAxisDirection: AxisDirection.right,
offset: ViewportOffset.zero(),
children: <RenderSliver>[
inner = childManager.createRenderObject(),
],
cacheExtent: 0.0,
);
layout(root);
expect(root.size.width, equals(800.0));
expect(root.size.height, equals(600.0));
expect(a.localToGlobal(const Offset(0.0, 0.0)), const Offset(0.0, 200.0));
expect(b.localToGlobal(const Offset(0.0, 0.0)), const Offset(0.0, -200.0));
expect(c.attached, false);
expect(d.attached, false);
expect(e.attached, false);
// make sure that layout is stable by laying out again
inner.markNeedsLayout();
pumpFrame();
expect(a.localToGlobal(const Offset(0.0, 0.0)), const Offset(0.0, 200.0));
expect(b.localToGlobal(const Offset(0.0, 0.0)), const Offset(0.0, -200.0));
expect(c.attached, false);
expect(d.attached, false);
expect(e.attached, false);
// now try various scroll offsets
root.offset = ViewportOffset.fixed(200.0);
pumpFrame();
expect(a.localToGlobal(const Offset(0.0, 0.0)), const Offset(0.0, 400.0));
expect(b.localToGlobal(const Offset(0.0, 0.0)), const Offset(0.0, 0.0));
expect(c.attached, false);
expect(d.attached, false);
expect(e.attached, false);
root.offset = ViewportOffset.fixed(600.0);
pumpFrame();
expect(a.attached, false);
expect(b.localToGlobal(const Offset(0.0, 0.0)), const Offset(0.0, 400.0));
expect(c.localToGlobal(const Offset(0.0, 0.0)), const Offset(0.0, 0.0));
expect(d.attached, false);
expect(e.attached, false);
root.offset = ViewportOffset.fixed(900.0);
pumpFrame();
expect(a.attached, false);
expect(b.attached, false);
expect(c.localToGlobal(const Offset(0.0, 0.0)), const Offset(0.0, 300.0));
expect(d.localToGlobal(const Offset(0.0, 0.0)), const Offset(0.0, -100.0));
expect(e.attached, false);
// try going back up
root.offset = ViewportOffset.fixed(200.0);
pumpFrame();
expect(a.localToGlobal(const Offset(0.0, 0.0)), const Offset(0.0, 400.0));
expect(b.localToGlobal(const Offset(0.0, 0.0)), const Offset(0.0, 0.0));
expect(c.attached, false);
expect(d.attached, false);
expect(e.attached, false);
});
test('SliverList - no zero scroll offset correction', () {
RenderSliverList inner;
RenderBox a;
final TestRenderSliverBoxChildManager childManager = TestRenderSliverBoxChildManager(
children: <RenderBox>[
a = RenderSizedBox(const Size(100.0, 400.0)),
RenderSizedBox(const Size(100.0, 400.0)),
RenderSizedBox(const Size(100.0, 400.0)),
RenderSizedBox(const Size(100.0, 400.0)),
RenderSizedBox(const Size(100.0, 400.0)),
],
);
final RenderViewport root = RenderViewport(
axisDirection: AxisDirection.down,
crossAxisDirection: AxisDirection.right,
offset: ViewportOffset.zero(),
children: <RenderSliver>[
inner = childManager.createRenderObject(),
],
);
layout(root);
final SliverMultiBoxAdaptorParentData parentData = a.parentData as SliverMultiBoxAdaptorParentData;
parentData.layoutOffset = 0.001;
root.offset = ViewportOffset.fixed(900.0);
pumpFrame();
root.offset = ViewportOffset.fixed(0.0);
pumpFrame();
expect(inner.geometry.scrollOffsetCorrection, isNull);
});
test('SliverList - no correction when tiny double precision error', () {
RenderSliverList inner;
RenderBox a;
final TestRenderSliverBoxChildManager childManager = TestRenderSliverBoxChildManager(
children: <RenderBox>[
a = RenderSizedBox(const Size(100.0, 400.0)),
RenderSizedBox(const Size(100.0, 400.0)),
RenderSizedBox(const Size(100.0, 400.0)),
RenderSizedBox(const Size(100.0, 400.0)),
RenderSizedBox(const Size(100.0, 400.0)),
],
);
inner = childManager.createRenderObject();
final RenderViewport root = RenderViewport(
axisDirection: AxisDirection.down,
crossAxisDirection: AxisDirection.right,
offset: ViewportOffset.zero(),
children: <RenderSliver>[
inner,
],
);
layout(root);
final SliverMultiBoxAdaptorParentData parentData = a.parentData as SliverMultiBoxAdaptorParentData;
// Simulate double precision error.
parentData.layoutOffset = -0.0000000000001;
root.offset = ViewportOffset.fixed(900.0);
pumpFrame();
final ViewportOffsetSpy spy = ViewportOffsetSpy(0.0);
root.offset = spy;
pumpFrame();
expect(spy.corrected, false);
});
test('SliverMultiBoxAdaptorParentData.toString', () {
final SliverMultiBoxAdaptorParentData candidate = SliverMultiBoxAdaptorParentData();
expect(candidate.keepAlive, isFalse);
expect(candidate.index, isNull);
expect(candidate.toString(), 'index=null; layoutOffset=None');
candidate.keepAlive = null;
expect(candidate.toString(), 'index=null; layoutOffset=None');
candidate.keepAlive = true;
expect(candidate.toString(), 'index=null; keepAlive; layoutOffset=None');
candidate.keepAlive = false;
expect(candidate.toString(), 'index=null; layoutOffset=None');
candidate.index = 0;
expect(candidate.toString(), 'index=0; layoutOffset=None');
candidate.index = 1;
expect(candidate.toString(), 'index=1; layoutOffset=None');
candidate.index = -1;
expect(candidate.toString(), 'index=-1; layoutOffset=None');
candidate.layoutOffset = 100.0;
expect(candidate.toString(), 'index=-1; layoutOffset=100.0');
});
}