Allow depending on ModalRoute.popDispositionOf(context)

Use case

I want to implement a custom widget that can close the current route using a gesture. One of my requirements is that the gesture is not accepted, if the current route can't be popped using a gesture (aka its popDisposition is .doNotPop).

Unfortunately, I found no way to keep my widget updated, since depending on ModalRoute.of(context) doesn't trigger a rebuild when the popDisposition changes, and its Notifications bubble upwards, so the route's contents can't receive them.

Proposal

Add popDisposition as an aspect to the respective InheritedModel so that we can depend on it reliably.

You can create your own NotificationListener<NavigationNotification>. Here is an example from the framework:

flutter/packages/flutter/lib/src/widgets/navigator.dart

Lines 5866 to 5880 in 9ded795

    
           child: NotificationListener<NavigationNotification>( 
        
             onNotification: (NavigationNotification notification) { 
        
               // If the state of this Navigator does not change whether or not the 
        
               // whole framework can pop, propagate the Notification as-is. 
        
               if (notification.canHandlePop || !canPop()) { 
        
                 return false; 
        
               } 
        
               // Otherwise, dispatch a new Notification with the correct canPop and 
        
               // stop the propagation of the old Notification. 
        
               const NavigationNotification nextNotification = NavigationNotification( 
        
                 canHandlePop: true, 
        
               ); 
        
               nextNotification.dispatch(context); 
        
               return true; 
        
             },

@maRci002

Hi @maRci002, thanks for the swift response! I don't think this is a viable solution, since Notifications only bubble upwards, while I want to know the route's popDisposition from it's subtree (any widget that's part of a route's content).

Let me know if I'm misunderstanding something.

Feat: Add opaque, isActive, isFirst, popDisposition aspects for Modal…

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Allow depending on `ModalRoute.popDispositionOf(context)` #162009

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	child: NotificationListener<NavigationNotification>(
	onNotification: (NavigationNotification notification) {
	// If the state of this Navigator does not change whether or not the
	// whole framework can pop, propagate the Notification as-is.
	if (notification.canHandlePop \|\| !canPop()) {
	return false;
	}
	// Otherwise, dispatch a new Notification with the correct canPop and
	// stop the propagation of the old Notification.
	const NavigationNotification nextNotification = NavigationNotification(
	canHandlePop: true,
	);
	nextNotification.dispatch(context);
	return true;
	},

Allow depending on ModalRoute.popDispositionOf(context) #162009

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maRci002 commented on Jan 23, 2025

timcreatedit commented on Jan 23, 2025

github-actions commented on Jun 12, 2025

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Allow depending on `ModalRoute.popDispositionOf(context)` #162009