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no object passed when an event occur in any flutter widget #50634
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Not sure why you need it, but you could just call another function from the onPressed handler and pass it the current widget state (
this):Container( padding: EdgeInsets.all(0), child: IconButton( icon: (_isFavorited ? Icon(Icons.star) : Icon(Icons.star_border)), color: Colors.red[500], onPressed: (){ yourFunction(this); // <-- } ), ),
Does that work for you? What more would you need? And for what use case?
thx for the response , i try that but the
thisreturn the parent object ofContainerwhich is in our case
_FavoriteWidgetState;You can pass whatever you want in there. It doesn't have to be
this.Also, why do you need this? What is the use case?
You can pass whatever you want in there. It doesn't have to be
this.
the problem is notthis, what i realy want is some thing similar to this:onPressed: (IconButton object){ //some code }why do you need this? What is the use case?
this example is not my case i just copy it from flutter documentation for demonstration
my case is the folowingContainer( padding: EdgeInsets.all(32), child: Column( children: <Widget>[ for (Category i in allCategories ) SwitchListTile( key: Key(i.id.toString()), activeColor: Colors.amber, activeTrackColor: Colors.red, inactiveTrackColor: Colors.blueAccent, title: Text(i.titre,style: TextStyle(color: Colors.white),), value: _value, onChanged:(bool value){ // some code }, ), ], ), )i generate a dynamic widget list base on a object List (allCategories), and each widget in the widget List has a key which i need it to do my logic in the onChanged method , what i want is some thing similar to this .
onChanged:(SwitchListTile value){ // some code },Thanks for your question lionviskame , I have the same problem ..
- changed the title
[-]missing important feature[/-][+]no object passed when an event occur in any flutter widget [/+]on Jul 31, 2020 I am going to close this as there are ways around this as described in my previous comments.
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on Oct 18, 2022
i have noticed that there is no object (widget in current state) passed when an event occur in any flutter widget .
if we take this example
we notice "onPressed" within "IconButton" widget doesn't have a function signature that allow the object(widget in the current state) to be passed as argument like java(native android app) or c#(winforms) did , that would be hell for dynamic widget generation or some generic logic. it would be very nice if you take this as a new feature or fix . thx