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flutter use valuechanged function in function

By SeriousMonkSeriousMonk on Nov 17, 2020 
class 1{
  //in the class where you need to use the callback declare as field
  Function(String value) onChanged,

  //then use the function as inChanged callback eventually adding code
  TextField(
    onChanged: (value){
        onChanged(value);
        state.didChange(value);
    },
  )
}

//in the other class pass the function like this
class 2{
	new 1({
    	...
        onChanged: (value) {
        	restaurant.name = value;
        },
        ...
    });
}

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dart callback function with parameter

By cookie monstercookie monster on Jan 06, 2021 
class Obj {
	// <returnType> Function(<parameters>) fName;
	String Function(String, int, etc...) callbackName;
    
    // Call the callback function somewhere, eg constructor, textfield etc.
    Obj(this.callbackName);
}

main() {
	// Use the callback
	var myObj = Obj((String p1, int p2, etc...) {
		return "$p1$p2";
	});
}

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