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| NotificationListener<ScrollUpdateNotification>( | |
| onNotification: (notification) { | |
| if ((notification.scrollDelta < 0) && (animation.isDismissed)) { | |
| _controller.forward(); | |
| } else if ((notification.scrollDelta > 0) && | |
| (animation.isCompleted)) { | |
| _controller.reverse(); | |
| } | |
| }, | |
| child: ListView(...) |
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