Cell/Row selection when mouse right click

[Marco]

Hello,
I'm using Q1 2010 RadGridView in an application where I have a context menu that displays options based on the cell value.

It works perfectly when the user clicks on the cell (CurrentCell property is being loaded) and then right click on it to get the context menu.  However, I'd like to provide a behavior like excel in which, when the user rightclicks on any cell, it gets selected and the corresponding context menu will consider the actual cell value.
I couldn't find any property like "SelectCellOnMouseRightClick" or workaround that could help me achieve this.  Is there a way I can have this behavior in my RadGridView?

My SelectionMode="Extended", as there are other operation that require multiple row selection.

Thanks in advance

[Vlad]

Hi Marco,

You can use the approach demonstrated in this demo. Check the code in RadContextMenu_Opened for more info.

All the best,
Vlad
the Telerik team

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[Chris Boarman]

I have a similar requirement for a context menu to appear when user right-clicks a row. I tried the recommended example (handling the RadContextMenu_Opened event and setting IsCurrent and IsSelected to true) and it worked, except for one small problem - if the grid is in multiselect mode, any previous rows selected remain selected, even if the shift or control key is not pressed. I would expect the default behavior (when previous selctions exist) should be as follows:

1. A right-click select should cause all other selected items to be unselected, then show the context menu. 

2. A shift / right-click should extend the selection, then show the context menu.

3. A control right-click should add the row to the selection, then show context menu.

Is there some way I could modify the recommended example to achieve this behavior?

For reference, here is the code I am using:

        Private Sub RadContextMenu_Opened(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs)
            Dim menu As RadContextMenu = DirectCast(sender, RadContextMenu)
            Dim row As GridViewRow = menu.GetClickedElement(Of GridViewRow)()

            If row IsNot Nothing Then
                row.IsCurrent = True
                row.IsSelected = True
                ' The following is not neeed 'cause we are in row select mode (left it in in case we ever
                ' need it <ccb 6.10.10>
                'Dim cell As GridViewCell = menu.GetClickedElement(Of GridViewCell)()
                'If cell IsNot Nothing Then
                '    cell.IsCurrent = True
                'End If
                menu.IsOpen = True ' needed to show the context menu
            Else
                menu.IsOpen = False
            End If

        End Sub
    End Class

[Milan]

Hello Chris Boarman,

Currently you can force the grid to unselect all rows by clearing the SelectedItems collection (SelectedItems.Clear()). After the selection is cleared you can select the desired row by setting its IsSelected property to true or simply adding its associated data item to the SelectedItems collection.

We will consider your request regarding right-click selection.

Thank you for your feedback.

Best wishes,
Milan
the Telerik team

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[Leon]

When I click on the Demo...

it says that "Could not load file or assembly "GridView" or one of its dependencies...

Please help..

[Milan]

Hello Leon,

Could you please clear your XBAP cache by executing the following command from your Visual Studio command prompt:

mage -cc

Sincerely yours,
Milan
the Telerik team

[Leon]

Still no luck...

same issue...can someone just paste the code example here.

Thanks

[Joel Palmer]

Can I just say that it was frustrating knowing that there is an example somewhere but the referenced hyperlink didn't go anywhere.  Here is how I got it working.

XAML:

<telerikGrid:RadGridView
            x:Name="controlGrid"
            Grid.Row="0"
            ShowGroupPanel="False"
            AutoGenerateColumns="True"
            IsFilteringAllowed="False"
            CanUserDeleteRows="False"
            CanUserReorderColumns="False"
            CanUserSortColumns="False"
            SelectionUnit="Cell"
            SelectionMode="Single"
            CanUserSelect="True"
            CellEditEnded="cellEditEnded"
            RowLoaded="gridRowLoaded"
            SelectedCellsChanged="gridSelectedCellsChanged"
    >

    <telerik:RadContextMenu.ContextMenu>
        <telerik:RadContextMenu
            x:Name="GridContextMenu"
            Opened="GridContextMenu_Opened">

            <MenuItem
                Header="Add Row"
                Click="mnuAddRow_Click"
                IsEnabled="{Binding ElementName=controlGrid,
                Path=IsReadOnly, Converter={StaticResource InvertedBooleanConverter1}}" />

            <MenuItem
                Header="Add Column"
                Click="mnuAddColumn_Click"
                IsEnabled="{Binding ElementName=controlGrid,
                Path=IsReadOnly, Converter={StaticResource InvertedBooleanConverter1}}" />

            <MenuItem Header="-" />

            <MenuItem Header="P_roperties..."
                Click="mnuCellProperties_Click"
                IsEnabled="{Binding ElementName=controlGrid,
                Path=IsReadOnly,
                Converter={StaticResource InvertedBooleanConverter1}}" />
        </telerik:RadContextMenu>

    </telerik:RadContextMenu.ContextMenu>

</telerikGrid:RadGridView>

C#

private void GridContextMenu_Opened(object sender, RoutedEventArgs e)
{
    try
    {
        RadContextMenu menu = (RadContextMenu)sender;
        GridViewCell cell = menu.GetClickedElement<GridViewCell>();
        if (cell != null)
        {
            cell.IsSelected = true;
            cell.IsCurrent = true;
        }
    }
    catch (Exception ex)
    {
        exceptionHandler(ex);
    }
}

[Maya]

Hi Joel,

I am sorry to see that you have been frustrated with the information provided. The link targets WPF version of the examples that (when being posted) used to be in XBAP (i.e. they could be opened directly in IE). You can find the same example for WPF in your local installation or in our Silverlight demos as well (please follow this link(http://demos.telerik.com/wpf/?GridView/RowContextMenu) for a reference).
Furthermore, you can find information for similar scenarios in our forums as well (link1, link2, link3, link4).

Greetings,
Maya
the Telerik team

[May]

Anyway to enable cell/row selection on mouse right click outside the "code behind file"? I need this to work on all my grids and would prefere if I could handel it in the style or/and viewmodel? Anyone?

[Maya]

Hi May,

You can create custom behavior and attach it to each grid you require such functionality for. 

Kind regards,
Maya
the Telerik team

[Andrew]

I've implemented cell selection on right-click, but it's not removing the orange background on the previously highlighted cell. So each time I right-click I end up with more and more orange cells. I'm clearing down the SelectedItems, but it makes no difference. Here is my grid XAML:-

<telerik:RadGridView Name="grdMain" AutoGenerateColumns="True" IsReadOnly="True" ItemsSource="{Binding Data}" SelectionMode="Single" SelectionUnit="Cell" ShowColumnHeaders="False" ShowInsertRow="False" ShowGroupPanel="False" MouseRightButtonUp="grdMain_MouseRightButtonUp" />

And here is the code-behind:-

private void grdMain_MouseRightButtonUp(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
    var s = e.OriginalSource as FrameworkElement;
    if (s is TextBlock)
    {
        var cell = s.ParentOfType<GridViewCell>();
        grdMain.SelectedItems.Clear();
        cell.IsCurrent = true;
        cell.IsSelected = true;
    }
}

Any idea why this is happening?

[Maya]

Hello Andrew,

Could you try clearing the SelectedCells collection instead ? Do you get the same behavior ?  

Regards,
Maya
the Telerik team

[Andrew]

Hi, clearing down SelectedItems and SelectedCells didn't work (both were always empty). In the end I used the following:-

                if (grdMain.CurrentCell != null)
                {
                    grdMain.CurrentCell.IsCurrent = false;
                    grdMain.CurrentCell.IsSelected = false;
                }

Hope this helps someone.

[Js]

Add the GridCellInfo to the SelectedCells collection and the SelectedCells.Clear will work correctly:

grdMain.SelectedCells.Clear();

cell.IsCurrent = true;

cell.IsSelected = true;
   grdMain.SelectedCells.Add(new GridViewCellInfo(cell));



Regards,
J.S.

[Nimisha]

Hi Joel,

Thanks a lot. That was a useful piece of information, with example. :)