CODEWITHSUNDEEP
flutter
Luke Pighetti
Luke Pighetti

Reputation: 4841

GestureDetector that overrides children GestureDetectors?

Is there any way to make a GestureDetector override the functionality of all children GestureDetectors?

I have a complex Widget that I would like to be able to easily override all of its behavior at a high level. For example, locking a free user out of functionality.

Upvotes: 13

Views: 11394

Answers (3)

meatrobot
meatrobot

Reputation: 815

Another method: create an onTap attribute then pass that in to the child widget:

// Somewhere in parent widget
ChildWidget(onTap: () => doSomething())

class ChildWidget extends StatelessWidget {
  ChildWidget({Key key, this.onTap}) : super(key: key);

  final Function onTap;

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: () {
        onTap();
      },
      child: SomeWidget(),
    );
  }
}

You'd probably want to make onTap optional, and if onTap is null, don't wrap in a GestureDetector.

Upvotes: -2

boformer
boformer

Reputation: 30103

To temporarily disable all child gesture detectors, use an IgnorePointer widget:

  @override
  Widget build(BuildContext context) {

    bool ignoreChildGestures = true;

    return GestureDetector(
      onTap: () {
        print('parent tapped');
      },
      child: IgnorePointer(
        ignoring: ignoreChildGestures,
        child: GestureDetector(
          onTapDown: (details) {
            // won't be called when ignoring is set to true
            print('child tap down!');
          },
        ),
      ),
    );
  }

Upvotes: 22

Rémi Rousselet
Rémi Rousselet

Reputation: 277587

You can change HitTestBehavior behavior of GestureDetector to HitTestBehavior.opaque

GestureDetector(
   behavior: HitTestBehavior.opaque,
   ...
)

By default, it uses HitTestBehavior.deferToChild.

Upvotes: 7

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