Checkbox at MainWindow that sets values to controls located on underlaying UserControls

Question

In MainWindow class I have checkbox that controls property used by many objects like grids, listviews, etc in UserControls

    <CheckBox Content="Show objects ID" Name="showID" IsChecked="False" />

than there is property defined,

    public Visibility ShowObjectIDasVisibility
    {
        get { return showID.IsChecked.Equals(true) ? Visibility.Visible : Visibility.Collapsed; }
    }

I have some more like this to return boolean, width depending on what should be used on target control.

I managed to bind controls located in UserControl objects to use this property like this:

<TextBlock Visibility="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}, Path=ShowObjectIDasVisibility}" />

But it works only ones, while creating this TextBlock, than I can toggle checkbox as many times I like, and the TextBlock will stay visible or not depending on first value.

How should I do this properly? Thanks.

Answer 1

Instead of INotifyPropertyChanged interface you can use DependencyProperty:

public Visibility ShowObjectIDasVisibility
    {
        get { return (Visibility)GetValue(ShowObjectIDasVisibilityProperty); }
        set { SetValue(ShowObjectIDasVisibilityProperty, value); }
    }
    public static readonly DependencyProperty ShowObjectIDasVisibilityProperty =
        DependencyProperty.Register("ShowObjectIDasVisibility", typeof(Visibility), typeof(MainWindow), new PropertyMetadata(Visibility.Collapsed));

Now, to show/hide your TextBlock you need to change ShowObjectIDasVisibility value.

For example, you can do it by adding to checkbox Click="OnShowID_Click and in code behind

private void OnShowID_Click(object sender, RoutedEventArgs e)
    {
        ShowObjectIDasVisibility = ShowObjectIDasVisibility == System.Windows.Visibility.Visible ? System.Windows.Visibility.Collapsed : System.Windows.Visibility.Visible;
    }