TdxGanttControlTaskStartCreateEvent Type

Performs a set of actions before a user drags and drops the mouse to create a task.

Declaration

TdxGanttControlTaskStartCreateEvent = procedure(Sender: TObject; AID: Integer; AStart: TDateTime; var AAllow: Boolean) of object;

Parameters

Name	Type	Description
Sender	TObject	The Chart View that raised the event.
AID	Integer	The task’s unique identifier.
AStart	TDateTime	The task’s start date.
AAllow	Boolean	If True, a user can drag the mouse pointer in the chart (while holding the left mouse button) to create a task. If False, the operation is prohibited.

Remarks

You can open the Features Demo and modify its code. Handle the OnTaskStartCreate event and use the following code snippet to restrict users from creating tasks that occur before the project’s start date:

Delphi

procedure TFeaturesDemoMainForm.GanttControlViewChartTaskStartCreate(Sender: TObject;
  AID: Integer; AStart: TDateTime; var AAllow: Boolean);
begin
  AAllow := AStart > GanttControl.DataModel.RealProjectStart;
end;

C++

void __fastcall TFeaturesDemoMainForm::GanttControlViewChartTaskStartCreate(TObject *Sender,
          int AID, TDateTime AStart, bool &AAllow)
{
  AAllow = AStart > GanttControl->DataModel->RealProjectStart;
}