IgnorePointer部分，而不是整个窗口小部件

Question

我想在小部件的特定部分进行触摸，以使下面的小部件能够处理手势。 IgnorePointer在整个窗口小部件上执行该操作。是否可以部分进行？

在iOS中，有UIView.point（inside：with：）

Answer 1

我创建了自己的小部件。hitTest方法可以决定是否允许触摸。如果要特定的小部件允许点，请使用GlobalKey对象作为可触摸小部件的键，并使用该全局键来获取上下文和渲染对象。使用渲染对象并将类型设置为RenderBox。使用我编写的扩展名并调用rectFromAncestor以获取rect和调用包含的内容以检查是否指向窗口小部件内。

import 'package:flutter/foundation.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/widgets.dart';

class RenderIgnorePosition extends RenderProxyBox {
  /// Creates a render object that is invisible to custom hit testing.
  RenderIgnorePosition({
    RenderBox child,
    @required bool Function(BoxHitTestResult, {Offset position}) hitTest,
  })  : _hitTest = hitTest,
        super(child);

  final bool Function(BoxHitTestResult, {Offset position}) _hitTest;

  @override
  bool hitTest(BoxHitTestResult result, {Offset position}) {
    return _hitTest(result, position: position) &&
        super.hitTest(result, position: position);
  }
}

class IgnorePosition extends SingleChildRenderObjectWidget {
  /// Creates a widget that is invisible to hit testing.
  const IgnorePosition({
    Key key,
    @required this.hitTest,
    @required Widget child,
  })  : assert(hitTest != null),
        super(key: key, child: child);

  final bool Function(BoxHitTestResult, {Offset position}) hitTest;

  @override
  RenderIgnorePosition createRenderObject(BuildContext context) {
    return RenderIgnorePosition(
      hitTest: hitTest,
    );
  }
}

extension RenderBoxExtension on RenderBox {
  Rect rectFromAncestor(RenderObject ancestor) {
    final offset = localToGlobal(Offset.zero, ancestor: ancestor);
    return RRect.fromLTWH(
      offset.dx,
      offset.dy,
      size.width,
      size.height,
    );
  }
}