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Darrin
110
Hiding / disabling the UltraCombo drop down button
posted

Hi,

I would like to hide the drop down button on the UltraCombo.  Yes I know it would basically be a text box at that point, but that is what I want.  If it is not possible to hide the drop down then maybe someone can tell me how to disable the button or change the button graphic.

Here is why:

There are cases where there are 250,000 records if I don't filter the list.  I would like to make it so the user has to type a certain number of characters (let's say 4) before the query is issued that will populate the combo.  This allows me to add a where clause to the query so it returns faster (hits an index and returns less rows).

So I don't want the user to see the drop down, try to click it before we have populated the combo.  I want them to type 4 characters first, then populate the combo, drop the list and show the first item in the list that matches their 4 typed in characters.

 

Thanks

Randy

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  • 110
    Verified Answer
    posted

    Never mind I figure it out.  What I ended up doing is getting the UIElement and disabling it by using the UI CreationFilter.

    My case may be slightly unique as I am creating a custom control by inheriting from UltraCombo, but the concept should be the same.

     First I implement the interface: 

    Infragistics.Win.IUIElementCreationFilter

    Then  when the control is created right after InitializeComponent() I have a line that looks like this:

     base.CreationFilter = this;

    The inteface implementation looks like this:

    #region IUIElementCreationFilter Members

        public void AfterCreateChildElements(Infragistics.Win.UIElement parent)
        {
            if (parent is Infragistics.Win.EditorWithComboUIElement)
            {
                Infragistics.Win.EditorWithComboUIElement uiElement = (Infragistics.Win.EditorWithComboUIElement)parent;
                foreach(Infragistics.Win.UIElement chldElement in uiElement.ChildElements)
                {
                    if (chldElement is Infragistics.Win.EditorWithComboDropDownButtonUIElement)
                    {
                        chldElement.Enabled = mDropDownEnabled;
                        break;
                    }
                }
            }
        }

        public bool BeforeCreateChildElements(Infragistics.Win.UIElement parent)
        {
            return false;
        }

        #endregion

     

     

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