Delete unused styles

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Description

The macro presented here is intended to show how to remove unused custom styles from a document.

The macro starts by accessing the "style families". Depending on the type of document these can be CharacterStyles, ParagraphStyles, FrameStyles, PageStyles, NumberingStyles, CellStyles, ShapeStyles.

The code below searches through the cell styles of a Calc sheet, in which the CellStyles collection is looped through. For each element, the methods isUserDefined and isInUse are used to test if it is a custom style used or not.

The only particularity is that we browse the collection "backwards" from n to zero to avoid problems (since we delete elements from the browsed collection).

Code

In LibreOffice Basic:

Option Explicit

Sub delete_unused_styles ()
    
    Dim oStylesF    As Object
    Dim oStyles     As Object
    Dim oStyle      As Object
    Dim i           As Integer
    
    oStylesF = ThisComponent.getStyleFamilies

    If oStylesF.hasByName("CellStyles") Then
        oStyles = oStylesF.getByName("CellStyles")
        
        For i = UBound(oStyles.ElementNames) To 0 Step -1
            oStyle = oStyles.getByName(oStyles.ElementNames(i))
            
            If oStyle.isUserDefined And Not(oStyle.isInUse) Then
                oStyle = Nothing
                oStyles.removeByName(oStyles.ElementNames(i))
            End If
        Next i
        
        MsgBox "Done!"
    Else
        MsgBox "No user-defined style families found..."
    End If
    
End Sub ' delete_unused_styles