NumericUpDown change its value on CellTemplate

[alex]

Hello,

I have a xaml with RadGridView which contains 4 columns. One of the columns has DataMemberBinding to a Double number/property and a cell template with a NumericUpDown control which is binded to the same Double property.

When I click the RadNumericUpDown arrow to change the value and the control remains Focusded and click immediatly the CellHeader for sorting, sometimes the value of some rows are changed to be the value of other rows. This is happens when I click the header many times with RowVirtualization=False.

If I click the arrow of the RadnumericUpDown and then I click another control to remove the focus and then I can click the header many times and the issue can't be reproduced. The update source trigger is PropertyChanged.

Sometimes during sorting the value is changed and then restored to the correct one.

Please I would like to know if you can fix it or give me some workaround. This is a very simple requirement (sorting). 

[Martin Ivanov]

To avoid this behavior, you can move the focus from the NumericUpDown control when you start the sorting process. To do this, you can use the Sorting event of the GridView.

private void RadGridView_Sorting(object sender, Telerik.Windows.Controls.GridViewSortingEventArgs e)
{
	if (e.Column.UniqueName == "Number")
	{
		var focusedElement = (DependencyObject)FocusManager.GetFocusedElement(this);
		if (focusedElement is RadNumericUpDown || focusedElement.ParentOfType<RadNumericUpDown>() != null)
		{
			var cell = focusedElement.ParentOfType<GridViewCell>();
			if (cell != null)
			{
				cell.Focus();
			}
		}
	}
}

[alex]

Thank you it works (altough I don't like the solution, ot should not happend).

I created an attached property because we work only MVVM without code behind.

In order to get the focused element in static context I find in the tree view the window and put it instead of "this" in your solution.

 

How can I find the focus element without looking for control of type Window ?

In the future I can put the grid in other controls

[Martin Ivanov]

I am not sure that I understand your question, but you should be able to access the MainWindow using the static App.Current.MainWindow property. This way you will avoid the searching for a Window element. Alternatively, you should get the same effect by using gridview instance instead of "this". 

var focusedElement = (DependencyObject)FocusManager.GetFocusedElement((RadGridView)sender);

 

 

[alex]

Using gridView instance returns null

[Martin Ivanov]

Sorry, I made a mistake with the RadGridView suggestion. By default, the only focus scope is the MainWindow of the application. So, you can use the Application.Current.MainWindow as the argument for GetFocusedElement.

var focusedElement = (DependencyObject)FocusManager.GetFocusedElement(Application.Current.MainWindow);

[alex]

Hi, still focused element in null using MainWindow. I will use my workaround. 

Thank you