Disable MouseWheel in RadSpinElement

[Jason]

I've dynamically added a RadSpinElement to my RadRibbonBar and I'd like to make it so that the MouseWheel scrolling does not affect the value in the textbox. I'd like the user to have to either hold down the up/down arrow or type in a value.

Is there an event or property I can use to achieve this?

[Peter]

Hi Jason,

Thank you for writing.

You should set the RadSpinElement EnableMouseWheel property that gets or sets a value indicating whether the user can change the value with mouse wheel.

I hope this helps.

Kind regards,
Peter
the Telerik team

[Jason]

Is that property new in the 2012 Q2 release? I'm using the Q1 release and I don't see that property available - however I do see it in the online documentation.

[Svett]

Hi Jason,

The property will be available in the next major release, which will be available by the end of the next week. Nevertheless, you can create a custom editor to achieve the desired scenario. You can use the following code snippet:

public class MyGridSpinEditorElement : GridSpinEditorElement
    {
        private static readonly MethodInfo MouseWheelMethodInfo;

        static MyGridSpinEditorElement()
        {
            MouseWheelMethodInfo = typeof(RadSpinElement).GetMethod("textItem_MouseWheel", BindingFlags.Instance | BindingFlags.NonPublic);
        }

        private MouseEventHandler SpinElementMouseWheel;
        private bool enableMouseWheel = true;

        public MyGridSpinEditorElement()
        {

        }

        protected override void WireEvents()
        {
            base.WireEvents();

            if (this.SpinElementMouseWheel == null)
            {
                this.SpinElementMouseWheel = Delegate.CreateDelegate(typeof(MouseEventHandler), this, MouseWheelMethodInfo) as MouseEventHandler;
            }

            this.TextBoxItem.MouseWheel -= this.SpinElementMouseWheel;
            this.TextBoxItem.HostedControl.MouseWheel -= this.SpinElementMouseWheel;
            this.TextBoxItem.MouseWheel += new MouseEventHandler(TextBoxItem_MouseWheel);
            this.TextBoxItem.HostedControl.MouseWheel += new MouseEventHandler(TextBoxItem_MouseWheel);
        }

        protected override void UnwireEvents()
        {
            base.UnwireEvents();
            this.TextBoxItem.MouseWheel -= new MouseEventHandler(TextBoxItem_MouseWheel);
            this.TextBoxItem.HostedControl.MouseWheel -= new MouseEventHandler(TextBoxItem_MouseWheel);
        }

        public bool EnableMouseWheel
        {
            get { return this.enableMouseWheel; }
            set { this.enableMouseWheel = value; }
        }

        private void TextBoxItem_MouseWheel(object sender, MouseEventArgs e)
        {
            if (this.enableMouseWheel)
            {
                this.SpinElementMouseWheel(sender, e);
            }
        }
    }

public class MyGridSpinEditor : GridSpinEditor
{
    protected override Telerik.WinControls.RadElement CreateEditorElement()
    {
        MyGridSpinEditorElement element = new MyGridSpinEditorElement();
        element.EnableMouseWheel = false;
        return element;
    }
}

Then you should use the EditorRequired event to replace the default one:

void radGridView1_EditorRequired(object sender, EditorRequiredEventArgs e)
{
    if (e.EditorType == typeof(GridSpinEditor))
    {
        e.EditorType = typeof(MyGridSpinEditor);
    }
}

Regards,
Svett
the Telerik team