I have a class and I want to know When my classes are deactivating?-CodePudding

I have a class and I want to know when my class leave my tree widget. I think I can do that with lifecycle of app but I don't know how to do that.
please help

CodePudding user response：

enter code hereone thing you could do is useStatefullWidget and in that class we have a one function called deactivate()

     void deactivate() {
    // USE YOUR FUNCTION
    print("deactiv");
    super.deactivate();
  }

CodePudding user response：

in StatefullWidget there is a method name deactivate just call that method and place your code in it which will execute when widget is deactivated from widget tree

@override
void deactivate() {
  log('Deactivated');
  // TODO : Place your code here which will execute at deactivation
  super.deactivate();
}