ProcessMouseWheel in ComboBoxCell

[Hans Dampf]

I am wondering if it is possible to support the mouse wheel in a derived GridComboBoxCell. I have seen some implementations in the forum and tried these code snippets in my own class.

It looks something like this:

public override bool ProcessMouseWheel(MouseEventArgs e)
{
if (this.IsDroppedDown)
{
if (e.Delta < 0)
this.ListBoxPart.TopIndex++;
else
his.ListBoxPart.TopIndex--;
return true;
}
return false;
}

The function is called, but nothing happens?

Thanks,
George

[haneefm]

Hi George,

You need to create a custom celltype. It requires a model class and a renderer class. The model class handles the serialization requirements for the control and creates the renderer class. The renderer class handles the UI requirements of the cell. This sample in \Syncfusion\Essential Studio\4.1.0.10\windows\Grid.Windows\Samples\In Depth\DerivedCellControlTutorial can be referred.

After creating the custom celltype, it has to be registered through CellModels.Add

this.gridControl1.CellModels.Add("MyComboBox", new MyComboBoxCellModel(this.gridControl1.Model));

Then you may use
style.CellType = "MyComboBox";

Please refer to the attachment for implemention.
ComboBoxMouseWheel.zip


Best regards,
Haneef