Documentation | Tutorials | Interrupt
In DK11 we decided to not implement Esc button hijacking. Such operation done on a control side is not reliable if control is embedded into other control or other control got to focus. So now implement this requires a bit of coding to call GIS.Interrupt method upon pressing Esc key on main form context. Of course, you can implement an alternative method of interrupting for example upon clicking the mouse, etc.
In opposite to map drawing other long-term operation raise BusyEvent (VCL|FMX|WinForms|JAVA), which can be intercepted to show progress bar and allow interruption. Such event exits also on a layer level.
Ensure that TMainForm.KeyPreview is True.
Uses TGIS_ViewerWnd.Interrupt method
procedure TMainForm.FormKeyDown(Sender: TObject; var Key: Word; Shift: TShiftState); begin if Key = VK_ESCAPE then GIS.Interrupt ; end;
Uses TGIS_ViewerWnd.Interrupt method
procedure TMainForm.FormKeyDown(Sender: TObject; var Key: Word; var KeyChar: Char; Shift: TShiftState); begin if key = 27 then GIS.Interrupt ; end;
Ensure that MainForm.KeyPreview is True.
Uses TGIS_ViewerWnd.Interrupt method
private void MainForm_KeyDown(object sender, KeyEventArgs e) { if (e.KeyCode == Keys.Escape) { GIS.Interrupt(); } }