TXlsFile.GetTheme Method
This is an advanced method, that allows you to get the full theme in use. Normally you will just want to replace colors, and you can do this with TExcelFile.SetColorTheme(TPrimaryThemeColor, TDrawingColor) and TExcelFile.GetColorTheme(TPrimaryThemeColor) methods. Much of the functionality in a theme applies to PowerPoint, not Excel.
Syntax
Unit: FlexCel.XlsAdapter
function TXlsFile.GetTheme: ITheme; override;