CODEWITHSUNDEEP
wpfuser-controls
user1145533
user1145533

Reputation: 697

Update parent whenever a control changes value in WPF

Is it possible for a User control to receive an update whenever a user control changes value? I have a form with a save button and I want to activate it as soon as a value changes.

Currently I am ding this using my View but I have to add a call to every property when it changes. This is OK but for edit boxes it means the user has to tab away before the save button becomes active.

Upvotes: 1

Views: 450

Answers (2)

Amit
Amit

Reputation: 939

If you bind your view to a view model then you can have a flag IsDirty inside view model which will be set every time you fire PropertyChanged event

    protected void FirePropertyChanged(string propertyName)
    {
        PropertyChangedEventHandler handler = PropertyChanged;
        _isDirty = true;
        if(handler != null)
        {
            handler(this, new PropertyChangedEventArgs(propertyName));
        }
    }

Then bind your button with IsDirty

Upvotes: 1

Michel Keijzers
Michel Keijzers

Reputation: 15377

The easiest way is to create a IsDirty boolean property which is changed whenever a value is changed. Couple the IsEnabled property of the save button to the IsDirty boolean.

If it is in a class you want to have to be decoupled, use an event/notification.

Upvotes: 1

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