How can I implement the touch support for multisorting in RadGridView

[Nicolas]

Hello guys,

The multisorting in RadGridView on desktop works very well with the help of "Shift" key.

But I want to implement it for the tablet computer. I want to be able to do a multisorting on my RadGridView by tapping and holding (https://docs.telerik.com/devtools/wpf/common-information/touch-support)  a column instead of the "Shift" key.

How can I do this?

Thanks in advance for your help.

[Dilyan Traykov]

Hello Nicolas,

Indeed, currently, multi-column sorting is not available out-of-the-box when using a touch device. Luckily, however, enabling this is rather straightforward by handling the Sorting event:

private void Grid_Sorting(object sender, GridViewSortingEventArgs e)
{
    e.GetType().GetProperty("IsMultipleColumnSorting").SetValue(e, true, null);
}

In addition, you can enable this only for touch devices by setting a flag in the control's TouchUp event and checking this flag in the Sorting event:

private bool comingFromTouch;
 
public MainWindow()
{
    InitializeComponent();
    this.Grid.Sorting += Grid_Sorting;
    this.Grid.TouchUp += Grid_TouchUp;
}
 
private void Grid_TouchUp(object sender, TouchEventArgs e)
{
    this.comingFromTouch = true;
}
 
private void Grid_Sorting(object sender, GridViewSortingEventArgs e)
{
    if (this.comingFromTouch)
    {
        e.GetType().GetProperty("IsMultipleColumnSorting").SetValue(e, true, null);
        this.comingFromTouch = false;
    }
}

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

Regards,
Dilyan Traykov
Progress Telerik

[Nicolas]

Hello,

Thanks, i'm gonna try next week. I will let you know.