OnGesture (Delphi)

Description

This code example is a VCL Forms application that uses the OnGesture event. The main form contains two objects: a panel and a gesture manager (see figure Main form).

Main form

The gesture manager is associated with the panel (see figure Panel1—Object Inspector).

Panel1—Object Inspector

Only one standard gesture is enabled (sgiLeft). However, the OnGesture event is triggered every time a gesture is performed on the panel.

Code

The panel OnGesture callback is defined as follows:

uses Gestures;

{ ... }

procedure TMainForm.Panel1Gesture(Sender: TObject;
  const EventInfo: TGestureEventInfo; var Handled: Boolean);
var
  S: String;
begin
  if GestureToIdent(EventInfo.GestureID, S) then
    ShowMessage(S)
  else
    ShowMessage('Could not translate gesture identifier');
end;

Every time a gesture is performed on the panel, a message box appears with the string representation of the gesture identifier.

Uses

• Vcl.Controls.TControl.OnGesture ( fr | de | ja )
• Vcl.ExtCtrls.TPanel.OnGesture ( fr | de | ja )
• Vcl.Controls.TGestureEventInfo ( fr | de | ja )
• Vcl.Touch.Gestures.GestureToIdent ( fr | de | ja )

See Also

• Gesturing Overview