How to get the related RadDatePicker from Telerik.Windows.Controls.PickerTextBox

[Kevin]

I have two controls which are TextBox and RadDatePicker. Initially i have a focus on TextBox and then I click on RadDatePicker's edit field. During the lost focus event of TextBox I call FocusManager.GetFocusedElement() to find out which control got the focus.

The control is returned as Telerik.Windows.Controls.PickerTextBox. My question is how I can find out whick RadDatePicker control related to PickerTextBox.

[Hristo]

Hi Kevin,

Why do you need to know which element got focus?
Could you tell us what is your requirement?

Kind regards,
Hristo
the Telerik team

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[Kevin]

Hi Hristo,
 
    When I received the lost focus event of first TextBox, i am doing some validation for the data I got from TextBox. If the data is invalid, I need to set the focus back to TextBox control.

 

    Since user click DatePicker control to cause TextBox to lost focus, the DatePicker will fire the lost focus event to do some validation when I set the focus back to TextBox. As a result, i need to skip the validation on DatePicker in this case.

 

    As a result, after I get the focus control, I will know which control's validation event i need to skip.

 

    Above case is a simple case. In real project there is a generic function to handle the validation logic.

Thanks!

-Kevin

[Hristo]

Hello Kevin,

In WPF there is a TemplatedParent property that can be used for the purpose but in Silverlight it is internal.
I've created small class that will help you get the templated parent of some control.

Here is the helper class:

public class TemplatedParentHelper
{
    private static Control GetTemplatedParentInternal(DependencyObject obj)
    {
        return (Control)obj.GetValue(TemplatedParentInternalProperty);
    }

    private static readonly DependencyProperty TemplatedParentInternalProperty =
        DependencyProperty.RegisterAttached("TemplatedParentInternal", typeof(Control), typeof(TemplatedParentHelper), new PropertyMetadata(null));

    public static Control GetTemplatedParent(Control control)
    {
        Binding bindingHelper = new Binding() { RelativeSource = new RelativeSource(RelativeSourceMode.TemplatedParent) };
        control.SetBinding(TemplatedParentInternalProperty, bindingHelper);
        Control templatedParent = GetTemplatedParentInternal(control);
        control.ClearValue(TemplatedParentInternalProperty);
        return templatedParent;
    }
}

And here is the usage:

void MainPage_LostFocus(object sender, RoutedEventArgs e)
{
    Control focusedElement = System.Windows.Input.FocusManager.GetFocusedElement() as Control;
    RadDatePicker datePicker = TemplatedParentHelper.GetTemplatedParent(focusedElement) as RadDatePicker;
    if (datePicker != null)
    {
        // Do validation.
    }
}

I hope that this will help you.
Let us know if you need more information.

Best wishes,
Hristo
the Telerik team

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Watch a video on how to optimize your support resource searches and check out more tips on the blogs.

[Dondre]

Hi,

I see this is a kind of an old post but to directly answer the posters question you'd used the following:

C#
var datePicker = ((PickerTextBox)FocusManager.GetFocusedElement).GetParents()[1] as RadDatePicker;

VB.NET
Dim datePicker As RadDatePicker = TryCast(DirectCast(FocusManager.GetFocusedElement, Telerik.Windows.Controls.PickerTextBox).GetParents()(1), RadDatePicker)