Relative Dialog

A Flutter package for displaying a dialog relative to another widget.

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Anchor

The RelativeAnchor widget can be used to wrap the widget that the dialog should be shown relative to.

Builder(
  builder: (context) {
    return RelativeAnchor(
      builder: (
        context, {
        required show,
      }) {
        return ElevatedButton(
          child: Text('Show relative dialog'),
          onPressed: () {
            show(
              // The alignment the dialog should be positioned at relative to widget that opened it.
              alignment: Alignment.topRight,
              builder: (context) {
                return Text(
                  'Done!',
                  style: TextStyle(
                    color: Colors.white,
                  ),
                ),
              }
            );
          },
        );
      }
    );
  }
)

Imperative API

Alternatively, if you don't want to use the anchor widget, you can call showRelativeDialog directly, passing in the BuildContext that the dialog should be shown relative to:

Builder(
  builder: (context) {
    return ElevatedButton(
      child: Text('Show relative dialog'),
      onPressed: () {
        showRelativeDialog(
          // The context of the widget that the dialog should be shown relative to.
          context: context,
          // The alignment the dialog should be positioned at relative to widget that opened it.
          alignment: Alignment.topRight,
          builder: (context) {
            return Text(
              'Done!',
              style: TextStyle(
                color: Colors.white,
              ),
            ),
          }
        );
      },
    );
  }
)

Custom Animations

By default the dialog uses a FadeTransition animation, but custom animations can be specified using the transitionBuilder API:

Builder(
  builder: (context) {
    return ElevatedButton(
      child: Text('Show relative dialog'),
      onPressed: () {
        showRelativeDialog(
          context: context,
          alignment: Alignment.bottomRight,
          transitionBuilder: (context, animation, secondaryAnimation, child) =>
            ScaleTransition(
              alignment: Alignment.topRight,
              scale: CurvedAnimation(
                parent: animation,
                curve: Curves.easeOut,
                reverseCurve: Curves.easeIn,
              ),
              child: child,
            ),
          builder: (context) {
            return Text(
              'Done!',
              style: TextStyle(
                color: Colors.white,
              ),
            ),
          }
        );
      },
    );
  }
)

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Demo

Full demo.