OnStartPrint, OnEndPrint, OnNewPage, PageCount Example
The following code illustrates how to create a progress indicator, which appears as an independent form with a TProgressBar control on it. The caption of this form contains the indicator string. The TProgressBar control is used as a graphic progress indicator.
// Opens the indicator form
// This procedure is an event handler of the
// TdxComponentPrinter OnStartPrint event
procedure TForm1.dxComponentPrinter1StartPrint(Sender: TObject; AReportLink: TBasedxReportLink);
begin
Form2 := TForm2.Create(Application);
Form2.Show;
end;
// Closes the indicator form
// This procedure is an event handler of the
// TdxComponentPrinter OnEndPrint event
procedure TForm1.dxComponentPrinter1EndPrint(Sender: TObject; AReportLink: TBasedxReportLink);
begin
Form2.Close;
end;
// Repaints the indicator form on screen
// This procedure is an event handler of the
// TdxComponentPrinter OnNewPage event
procedure TForm1.dxComponentPrinter1NewPage(Sender: TObject; AReportLink: TBasedxReportLink; APageIndex: Integer; var ACancel: Boolean);
begin
// Creates an indicator string
Form2.Caption := 'Printing page '+ IntToStr(APageIndex) + ' of '+
IntToStr(dxComponentPrinter1Link1.PageCount) + ' pages';
// Calculates position of the graphic progress indicator
Form2.ProgressBar1.Position := Round(APageIndex / dxComponentPrinter1Link1.PageCount*100);
// Repaints the indicator form on screen
Form2.Repaint;
end;
This code provides the following progress indicator:
