Syntax

expression.Invalidate

expression An expression that returns a IRibbonUI object.

Remarks

You can customize the Ribbon UI by using callback procedures in COM add-ins. For each of the callbacks the add-in implements, the responses are cached. For example, if an add-in writer implements the getImage callback procedure for a button, the function is called once, the image loads, and then if the image needs to be updated, the cached image is used instead of recalling the procedure. This process remains in-place until the add-in signals that the cached values are invalid by using the Invalidate method, at which time, the callback procedure is again called and the return response is cached. The add-in can then force an immediate update of the UI by calling the Refresh method.

Example

In the following example, starting the host application triggers the onLoad event procedure that then calls a procedure which creates an object representing the Ribbon UI. Next, a callback procedure is defined that invalidates all of the controls on the UI and then refreshes the UI.

Visual Basic for Applications 
In the XML markup file: <customUI … …> In the VBA code: Dim MyRibbon As IRibbonUI Sub MyAddInInitialize(Ribbon As IRibbonUI) (You declare this function in your VBA Markup) Set MyRibbon = Ribbon End Sub Sub myFunction() MyRibbon.Invalidate() ' Invalidates the caches of all of this add-in's controls MyRibbon.Refresh() ' Refreshes the entire Ribbon UI End Sub

See also: