Keyboard Events for RadTreeView Checkbox

[Pelli]

Hi,

As CheckedItems Event  of RadTreeView is not giving results properly, we implemented RadTreeView Checkbox using MVVM using http://docs.telerik.com/devtools/wpf/controls/radtreeview/how-to/howto-tri-state-mvvm. Now, we are able to get the checked items properly.

Now, how should we support keyboard events like by pressing CTRl+Space , Node should get selected. Is there any way to handle this. If we do not use MVVM TriState check box, we can acheive by setting the property "IsOptionElementsEnabled" to true.

Please let me know your inputs.

Thanks,

Subhashini

 

 

[Martin Ivanov]

Hi Pelli,

To achieve this functionality in the MVVM scenario you will need to implement it with custom code. For example you can subscribe for the RadTreeView's KeyDown event and inside of it get the currently selected note and check it. The following code snippet demonstrates this approach for the MVVM implementation from the related help article.

this.tree.AddHandler(RadTreeView.KeyDownEvent, new KeyEventHandler(tree_KeyDown), true);
 .....
void tree_KeyDown(object sender, KeyEventArgs e)
{
    if (Keyboard.Modifiers == ModifierKeys.Control && e.Key == Key.Space)
    {
        var selectedCategory = (CategoryViewModel)this.tree.SelectedItem;
        selectedCategory.IsChecked = !selectedCategory.IsChecked;
    }
}

Please try this and let me know if it works for you.

Regards,
Martin
Telerik

[Pelli]

Hi Martin,

Thank you for your inputs. I am able to check/uncheck checkbox in radtrreview through keyboard inputs..

Thanks,

Subhashini

 

 

[Pelli]

Hi Martin,

I am able to acheive this only for single selected item. If I select multiple items through Shift key and press space button, only the last selected item is checked. Can you please provide inputs on this.

Thanks,

Subhashini

[Martin Ivanov]

Hi Subhashini,

In order to achieve the desired functionality for multiple selection you can use the SelectedItems collection of the treeview.

void tree_KeyDown(object sender, KeyEventArgs e)
{
    if (Keyboard.Modifiers == ModifierKeys.Control && e.Key == Key.Space)
    {
        foreach(CategoryViewModel category in this.tree.SelectedItems)
        {
            category.IsChecked = !selectedCategory.IsChecked;
        }
    }
}

Regards,
Martin
Telerik