Of course it is possible. Show me your XAML and I ll tel you how an attached event triggers an attached behavior.
Edited:
I dont see the need why you using attached behavior and attached events because you could do everything in code behind.
Here is how to do everything in code behind:
Here is XAML without attached properties:
<Grid>
<StackPanel>
<TextBox x:Name="txtBox" Margin="5" Text="Bye" TextWrapping="Wrap" Width="150"/>
<Button Name="MyButton" Content="Save" Width="50" Height="25" Click="MyButton_Click"/>
</StackPanel>
</Grid>
This is code behind.
public MainWindow()
{
InitializeComponent();
}
private void MyButton_Click(object sender, RoutedEventArgs e)
{
this.txtBox.Text = "hello";
}
Because you have set Name property on TextBox
and Button
you can access them from code behind in your Window.cs and you can write your handler easly.
Here is how you can do everything with attached properties:
This is the new XAML for the solution with attached properties. I had to create my custom Interaction because the one you are using is Expression Blend or silverlight and not pure WPF.
<Grid x:Name="LayoutRoot">
<StackPanel i:Interaction.Behaviour="True">
<TextBox x:Name="txtBox" Margin="5" Text="Bye" TextWrapping="Wrap" Width="150"/>
<Button Name="MyButton" Content="Save" Width="50" Height="25" Click="MyButton_Click"/>
</StackPanel>
</Grid>
I had to set Behavior on True
because the default value is false
and when value is not equal to the old then the propery changed event will be called with my custom logic like this:
private void MyButton_Click(object sender, RoutedEventArgs e)
{
RoutedEventArgs eventArgs = new RoutedEventArgs(ResetInputEventClass.ResetInputEvent,e.OriginalSource);
RaiseEvent(eventArgs);
}
public class Interaction : DependencyObject
{
// Using a DependencyProperty as the backing store for Behaviour. This enables animation, styling, binding, etc...
public static readonly DependencyProperty BehaviourProperty =
DependencyProperty.RegisterAttached("Behaviour", typeof(bool), typeof(Interaction), new PropertyMetadata(false, new PropertyChangedCallback(OnBehaviourChanged)));
private static void OnBehaviourChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
StackPanel sp = (StackPanel)d;
sp.Dispatcher.BeginInvoke(new Action(() =>
{
TextBox tb = VisualTreeHelper.GetChild(sp, 0) as TextBox;
ResetInputEventClass.AddResetInputHandler(sp, new RoutedEventHandler((o, a) =>
{
// Do here whatever you want, call your custom expressions.
tb.Text = "hello";
}));
}), System.Windows.Threading.DispatcherPriority.Background);
}
}
Inside property changed event which will be called as I already mentioned when I change false
to true
. I wait till everything is intialized by telling the dispatcher to execute my code when application is in background. Then I find the TextBox
and inject the handler which will be called when you trigger ResetInput
event.
This is very complicated solution but it will work with attached events and attached properties.
I highly recommend you to use the code behind for this scenario.
Also you made a mistake inside your ResetInputEventClass
class. Add and Remove methods are not correctly spelled.
This is how you should have written them:
public static void AddResetInputHandler(DependencyObject d, RoutedEventHandler handler)
{
UIElement uie = d as UIElement;
if (uie == null)
{
return;
}
uie.AddHandler(ResetInputEventClass.ResetInputEvent, handler);
}
public static void RemoveResetInputHandler(DependencyObject d, RoutedEventHandler handler)
{
UIElement uie = d as UIElement;
if (uie == null)
{
return;
}
uie.RemoveHandler(ResetInputEventClass.ResetInputEvent, handler);
}
Have fun, I hope I helped you out.
You could also have achieved this with Commands