Hi! In a Delphi XE7 VCL application, at runtime I need to validate the text input inside a TEdit to allow only valid file name characters. In Delphi XE7 there is the System.IOUtils.TPath.HasValidFileNameChars function. How can this be applied in real-time in a TEdit component?
Unfortunately, the TEdit component has no OnValidating event. I don't want to use the OnChange event, because it looks ugly when the character appears for a short time. The validation must occur BEFORE the character appears.