GetDefaultBitBtnGlyph variable

Declaration

GetDefaultBitBtnGlyph: TGetDefaultBitBtnGlyph = Nil

Description

GetDefaultBitBtnGlyph is a TGetDefaultBitBtnGlyph variable with the address for the routine used to get the default glyphs for TBitBtn instances in the application.

Kind is a TBitBtnKind argument that identifies the content needed in the bitmap returned from the function.

Handled is a Boolean value which indicates if the TBitmap instance was successfully created and loaded in the routine.

Create a function using the signature in TGetDefaultBitBtnGlyph, and assign it the variable to use custom bitmaps for the glyphs in TBitBtn. For example:

// provides Ok and Cancel glyphs
function GetCustomBitBtnGlyph(Kind: TBitBtnKind; Handled: Boolean): TBitmap;
begin
  if Kind in [bkOK, bkCancel] then
  begin
    Result := TBitmap.Create;
    case Kind of
      bkOk: Result.Assign(MyOkGlyph);
      bkCancel: Result.Assign(MyCancelGlyph);
    end;
  end
  else
    Result := Nil;

  Handled := (Result <> Nil);
end;

// assign the routine to the GetDefaultBitBtnGlyph variable
Buttons.GetDefaultBitBtnGlyph := @GetCustomBitBtnGlyph;

See also

• TGetDefaultBitBtnGlyph