mirror of
https://github.com/flutter/samples.git
synced 2025-11-13 00:08:24 +00:00
46 lines
1.8 KiB
Dart
46 lines
1.8 KiB
Dart
// Copyright 2018 the Charts project authors. Please see the AUTHORS file
|
|
// for details.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
import 'package:flutter_web/rendering.dart'
|
|
show
|
|
RenderBox,
|
|
RenderSemanticsGestureHandler,
|
|
RenderPointerListener,
|
|
RenderCustomMultiChildLayoutBox;
|
|
import 'chart_container.dart' show ChartContainerRenderObject;
|
|
|
|
/// Get the [ChartContainerRenderObject] from a [RenderBox].
|
|
///
|
|
/// [RenderBox] is expected to be a [RenderSemanticsGestureHandler] with child
|
|
/// of [RenderPointerListener] with child of [ChartContainerRenderObject].
|
|
ChartContainerRenderObject getChartContainerRenderObject(RenderBox box) {
|
|
assert(box is RenderCustomMultiChildLayoutBox);
|
|
final semanticHandler = (box as RenderCustomMultiChildLayoutBox)
|
|
.getChildrenAsList()
|
|
.firstWhere((child) => child is RenderSemanticsGestureHandler);
|
|
|
|
assert(semanticHandler is RenderSemanticsGestureHandler);
|
|
final renderPointerListener =
|
|
(semanticHandler as RenderSemanticsGestureHandler).child;
|
|
|
|
assert(renderPointerListener is RenderPointerListener);
|
|
final chartContainerRenderObject =
|
|
(renderPointerListener as RenderPointerListener).child;
|
|
|
|
assert(chartContainerRenderObject is ChartContainerRenderObject);
|
|
|
|
return chartContainerRenderObject as ChartContainerRenderObject;
|
|
}
|