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78 lines
2.2 KiB
Dart
78 lines
2.2 KiB
Dart
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:flutter_web/rendering.dart';
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import '../flutter_test_alternative.dart';
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import 'rendering_tester.dart';
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int layouts = 0;
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class RenderLayoutWatcher extends RenderProxyBox {
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RenderLayoutWatcher(RenderBox child) : super(child);
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@override
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void performLayout() {
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layouts += 1;
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super.performLayout();
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}
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}
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void main() {
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test('RenderViewport basic test - impact of layout', () {
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RenderSliverToBoxAdapter sliver;
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RenderViewport viewport;
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RenderBox box;
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final RenderObject root = RenderLayoutWatcher(
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viewport = RenderViewport(
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crossAxisDirection: AxisDirection.right,
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offset: ViewportOffset.zero(),
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children: <RenderSliver>[
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sliver = RenderSliverToBoxAdapter(
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child: box = RenderSizedBox(const Size(100.0, 400.0))),
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],
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),
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);
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expect(layouts, 0);
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layout(root);
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expect(layouts, 1);
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expect(box.localToGlobal(box.size.center(Offset.zero)),
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const Offset(400.0, 200.0));
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sliver.child = box = RenderSizedBox(const Size(100.0, 300.0));
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expect(layouts, 1);
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pumpFrame();
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expect(layouts, 1);
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expect(box.localToGlobal(box.size.center(Offset.zero)),
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const Offset(400.0, 150.0));
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viewport.offset = ViewportOffset.fixed(20.0);
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expect(layouts, 1);
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pumpFrame();
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expect(layouts, 1);
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expect(box.localToGlobal(box.size.center(Offset.zero)),
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const Offset(400.0, 130.0));
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viewport.offset = ViewportOffset.fixed(-20.0);
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expect(layouts, 1);
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pumpFrame();
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expect(layouts, 1);
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expect(box.localToGlobal(box.size.center(Offset.zero)),
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const Offset(400.0, 170.0));
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viewport.anchor = 20.0 / 600.0;
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expect(layouts, 1);
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pumpFrame();
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expect(layouts, 1);
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expect(box.localToGlobal(box.size.center(Offset.zero)),
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const Offset(400.0, 190.0));
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viewport.axisDirection = AxisDirection.up;
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expect(layouts, 1);
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pumpFrame();
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expect(layouts, 1);
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expect(box.localToGlobal(box.size.center(Offset.zero)),
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const Offset(400.0, 600.0 - 190.0));
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});
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}
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