Checked event to command for check edit column

saurabh nanda 2

created 6 years ago (modified 6 years ago)

Hi Team,

I have a check edit column in a grid control . I wan to display a warning when the check box column is check and uncheck if the user select "No" option from the confirmation message.

XAML
<DataTemplate>  
    <dxe:CheckEdit x:Name="PART_Editor" >  
        <dxmvvm:Interaction.Behaviors>  
            <dxmvvm:EventToCommand EventName="Checked"  PassEventArgsToCommand="True" Command="{Binding View.DataContext.CheckedCommand}"></dxmvvm:EventToCommand>  
        </dxmvvm:Interaction.Behaviors>  
    </dxe:CheckEdit>  
</DataTemplate>

View Model code to display warning:

C#
CheckEdit obj = (CheckEdit)((RoutedEventArgs)arg).Source;  
MessageBoxResult _dialogBoxResult = DXMessageBox.Show("Are you sure if you want to Check?", "Confirmation", MessageBoxButton.YesNo, MessageBoxImage.Question, MessageBoxResult.No);  
if (_dialogBoxResult == MessageBoxResult.No)  
{  
    obj.IsChecked = false;  
}

Issue in 3rd point:

User checks the check box and select "No" from warning.
Check box is not checked
Event is fired once again when the user clicks the mouse on the grid anywhere or any other column.

Thanks and Regards,
Saurabh

Answers approved by DevExpress Support

DevExpress Support Team

created 6 years ago

Hello Saurabh,

Our GridControl utilizes the virtualization mechanism to improve its performance. Virtualization reuses row, cell, and column visual elements, and changes their properties and data context. In particular, it reuses cell editors and changes their values during scrolling. Thus, it is not recommended to subscribe to the editor's event. Instead, you can use the corresponding grid's/view's events.

For example, in you scenario, it is necessary to handle the CellValueChanging event and invoke the HideEditor method to preserve the current value as described in the GridControl - Tagging/Checkedit in Grid thread. Attached is a sample project demonstrating this approach in action. Please take a moment to review it.

Thanks,
Michael

T710994.zip

Comments (2)

saurabh nanda 2 6 years ago

Thanks Michael, can you please convert the sample to MVVM complaint with binding event to command?

DevExpress Support Team 6 years ago

To adapt this solution for the MVVM pattern, I suggest that you create a custom behavior (as described in the How to: Create a Custom Behavior topic) and handle all required events at its level. This way, you will avoid referencing visual elements in your view model.

Thanks,
Michael

Checked event to command for check edit column

Answers approved by DevExpress Support

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