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child init method is called when parent is rebuild - flutter


child init method is called when parent is rebuild - flutter

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child init method is called when parent is rebuild - flutter
Tag : dart , By : Allen
Date : December 01 2020, 04:55 PM

Any of those help You can use the mixin AutomaticKeepAliveClientMixin and override the wantKeepAlive getter and return true to avoid recreating the State every time.
        class PostLoadWidgetState extends State<PostLoadWidget> with AutomaticKeepAliveClientMixin<PostLoadWidget> {


            ...

            @override
            bool get wantKeepAlive => true;

        }

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C# heritage : Call child method from parent method called by child


Tag : chash , By : robinator
Date : March 29 2020, 07:55 AM
it fixes the issue If you fix the compile errors, by making the method virtual in the parent class, and by adding a return value to the method in the child class, then it will work just fine:
class ParentClass 
{
    …

    public virtual void MethodB()
    {
        //Do stuff
    }
}
class ChildClass : ParentClass
{
    public override void MethodB()
    {
        //Do stuff
    }
}

Calling child method from parent, when parent method is called from child


Tag : ruby , By : Kristian Hofslaeter
Date : March 29 2020, 07:55 AM
To fix the issue you can do There are 2 Ruby classes: , So I ran your code with some puts:
class Parent
  class << self
    def method1
        puts "parent.method1; self: #{self.inspect}"
    end

    def method2
        puts "parent.method2 before method1 call; self: #{self.inspect}"
        method1
        puts "parent.method2 after method1 call"
    end
  end
end

class Child < Parent
  class << self
    def method1
        puts "child.method1; self: #{self.inspect}"
    end

    def method2
        puts "child.method2 before super; self: #{self.inspect}"
        super
        puts "child.method2 after super"
    end
  end
end


Child.method2
child.method2 before super; self: Child
parent.method2 before method1 call; self: Child
child.method1; self: Child
parent.method2 after method1 call
child.method2 after super

Flutter - Why is child widget's initState() is not called on every rebuild of Parent widget?


Tag : dart , By : Lex Viatkine
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Ok, looks like this was clearly mentioned in the State class' docs.
The correct way to do this is to override the didUpdateWidget method in the State subclass.

flutter: child Widgaet not rebuild after parent rebuild?


Tag : flutter , By : Robert MacGregor
Date : March 29 2020, 07:55 AM
will be helpful for those in need That is logical.
You are reusing an existing instance of a Widget, and widgets are immutable. As such, the framework notice that the instance of the widget did not change and doesn't call build to optimize performances.
class MyState extends State<MyStatefulWidget> {
  SomeWidget myWidget = SomeWidget()..someProperty = "initial value";

  void onSomething() {
    setState(() {
      myWidget.someProperty = "new value";
    });
  }

  @override
  Widget build(BuildContext context) {
    return myWidget;
  }
}
class MyState extends State<MyStatefulWidget> {
  SomeWidget myWidget = SomeWidget(someProperty: "initial value");

  void onSomething() {
    setState(() {
      myWidget = SomeWidget(someProperty: "new value");
    });
  }

  @override
  Widget build(BuildContext context) {
    return myWidget;
  }
}

Pylint says: W0233: __init__ method from a non direct base class 'Nested' is called (non-parent-init-called)


Tag : python , By : Fernando
Date : March 29 2020, 07:55 AM
hope this fix your issue Calling __init__ explicitly isn't wrong, but it is odd, and that's all Pylint is warning you about.
A better practice is to write a separate recursive function that does what you want, then call that from __init__.
class Nested:
    def __init__(self, data):
        self.recursive(data)

    def recursive(self, data):
        if isinstance(data, dict):
            for key, value in data.items():
                if isinstance(value, (float, int, str)):
                    setattr(self, key, value)
                else:
                    setattr(self, key, Nested(value))
        elif isinstance(data, list):
            for item in data:
                self.recursive(item)
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