showOverlay method

void showOverlay({ required PositionedBuilder positionedBuilder, })

Shows custom Overlay with given Widget

Implementation

void showOverlay({required PositionedBuilder positionedBuilder}) {
  assert(_key.currentState?.overlay != null, 'Tried to show overlay but overlayState was null. Key was :$_key');
  assert(_defaultFadeInDuration + _defaultFadeInDelay <= _overlayDuration, '''
  _defaultFadeInDelay + _defaultFadeDuration must be less than or equal to _overlayDuration''');
  final currentOpacity = 0.observable;

  Positioned widgetBuilder(BuildContext context) {
    final pos = positionedBuilder(context);
    return Positioned(
      height: pos.height,
      width: pos.width,
      top: pos.top,
      bottom: pos.bottom,
      left: pos.left,
      right: pos.right,
      child: Observer(
        builder: (context) => AnimatedOpacity(
          opacity: currentOpacity.value.toDouble(),
          duration: _defaultFadeInDuration,
          child: Material(
            child: pos.child,
          ),
        ),
      ),
    );
  }

  final overlayEntry = OverlayEntry(builder: widgetBuilder);
  _key.currentState!.overlay!.insert(overlayEntry);
  _defaultFadeInDelay.delay(() {
    currentOpacity.value = 1;
  });
  _overlayDuration.delay(() {
    overlayEntry
      ..remove()
      ..dispose();
  });
}