CODEWITHSUNDEEP
c#wpf
Jacek Wojcik
Jacek Wojcik

Reputation: 1253

IsReadonly variable which propagate on many controls

I have a UserControl window with controls on it.
I would like to add Enabled property for this UserControl which controls states of IsReadOnly property of selected controls.

How can I do it?
Thank you :-)

Upvotes: 1

Views: 51

Answers (1)

martavoi
martavoi

Reputation: 7092

for each child control in UserControl bind IsReadOnly property to parent:

<TextBox IsReadOnly="{Binding Enabled, RelativeSource={RelativeSource AncestorType={x:Type typeOfUserControl}}}">

and define Enabled Dependancy property for you UserControl.

you should also use bool inverse converter to convert enable-to-readonly logic:

[ValueConversion(typeof(bool), typeof(bool))]
    public class InverseBooleanConverter: IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter,
            System.Globalization.CultureInfo culture)
        {
            if (targetType != typeof(bool))
                throw new InvalidOperationException("The target must be a boolean");

            return !(bool)value;
        }

        public object ConvertBack(object value, Type targetType, object parameter,
            System.Globalization.CultureInfo culture)
        {
            throw new NotSupportedException();
        }
    }

UPD: From MSDN

You can use the as operator to perform certain types of conversions between compatible reference types or nullable types.

So:

public static readonly DependencyProperty EnabledDependencyProperty = 
     DependencyProperty.Register( "Enabled", typeof(bool),
     typeof(UserControlType), new FrameworkPropertyMetadata(true));

public bool Enabled
{
    get { return (bool)GetValue(EnabledDependencyProperty); }
    set { SetValue(EnabledDependencyProperty, value); }
}

Upvotes: 2

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