Change text selection when clicking on RadDropDownList

[Wojciech]

Hi,

I have a RadDropDownList control in my WinForms window. Right now, when I click on this control for the first time since opening a window, the whole text inside RadDropDownList text box is selected.  What I would like to happen is to just set cursor at the end of existing text with no text selection.

I tried handling most of the events for RadDropDownList (like GotFocus or Click) with:

    private void OnGotFocus(object sender, EventArgs e)
    {
      SelectionLength = 0;
      SelectionStart = Text.Length;
    }

When I checked during debugging, the selection is properly changed by my method, but in the end the text is selected whole by something else after that.

How can I get no text selection when clicking first time into this RadDropDownList text box?

Any ideas?

 

Thanks

Wojtek

 

[Dinko | Tech Support Engineer]

Hello Wojciech,

I appreciate your interest in our RadDropDownList control for WinForms.

The input part of the control is MS TextBox. Our text control is hosting the MS TextBox. You can use its SelectionStart property to make this work. The best place for me will be in the SelectedIndexChanged event handler.

public Form2()
{
    InitializeComponent();
    this.radDropDownList1.SelectedIndexChanged += RadDropDownList1_SelectedIndexChanged;
}

private void RadDropDownList1_SelectedIndexChanged(object sender, Telerik.WinControls.UI.Data.PositionChangedEventArgs e)
{
    this.radDropDownList1.DropDownListElement.TextBox.TextBoxItem.TextBoxControl.SelectionStart = this.radDropDownList1.DropDownListElement.TextBox.TextBoxItem.TextBoxControl.Text.Length;
}

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

Regards,
Dinko | Tech Support Engineer
Progress Telerik

[Wojciech]

Hello Dinko,

Thank you for your answer.

Unfortunately SelectedIndexChanged is not called when the control is clicked for the first time (when it wasn't focused on before) and RadDropDownList1_SelectedIndexChanged is not hit.

Do you maybe have some other idea what event handler should I try?

Regards,

Wojtek

[Dinko | Tech Support Engineer]

Hi Wojciech,

I have checked this on my side and indeed clicking on the text box will reset the selection. Upon checking the source code, the selection of the textbox is set in MouseUp event which makes it more difficult to handle. What I came up with is to reset the selection of the text in different events: GotFocus, MouseUp, and Load event of the form. Now in the MouseUp I have used BeginInvoke() method to delay the execution of the code so that it is executed after the internal text selection. To better demonstrate this, you can check the attached project.

I hope that the approach will work for you. I understand that this is not straighforward solution but I think that with some custom code you could implement your requirement.

[Wojciech]

Hello Dinko,

Thank you for the solution. It fixes my issue :)

Regards

Wojtek