blob: 9919286ca4424d8622764a6965d4d548a36c319b [file] [log] [blame]
// 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/material.dart';
import 'package:flutter/rendering.dart';
import '../flutter_test_alternative.dart';
import 'rendering_tester.dart';
class RenderLayoutTestBox extends RenderProxyBox {
RenderLayoutTestBox(this.onLayout);
final VoidCallback onLayout;
@override
void layout(Constraints constraints, { bool parentUsesSize = false }) {
// Doing this in tests is ok, but if you're writing your own
// render object, you want to override performLayout(), not
// layout(). Overriding layout() would remove many critical
// performance optimizations of the rendering system, as well as
// many bypassing many checked-mode integrity checks.
super.layout(constraints, parentUsesSize: parentUsesSize);
onLayout();
}
@override
bool get sizedByParent => true;
@override
void performLayout() { }
}
void main() {
test('moving children', () {
RenderBox child1, child2;
bool movedChild1 = false;
bool movedChild2 = false;
final RenderFlex block = RenderFlex(textDirection: TextDirection.ltr);
block.add(child1 = RenderLayoutTestBox(() { movedChild1 = true; }));
block.add(child2 = RenderLayoutTestBox(() { movedChild2 = true; }));
expect(movedChild1, isFalse);
expect(movedChild2, isFalse);
layout(block);
expect(movedChild1, isTrue);
expect(movedChild2, isTrue);
movedChild1 = false;
movedChild2 = false;
expect(movedChild1, isFalse);
expect(movedChild2, isFalse);
pumpFrame();
expect(movedChild1, isFalse);
expect(movedChild2, isFalse);
block.move(child1, after: child2);
expect(movedChild1, isFalse);
expect(movedChild2, isFalse);
pumpFrame();
expect(movedChild1, isTrue);
expect(movedChild2, isTrue);
movedChild1 = false;
movedChild2 = false;
expect(movedChild1, isFalse);
expect(movedChild2, isFalse);
pumpFrame();
expect(movedChild1, isFalse);
expect(movedChild2, isFalse);
});
}