TdxGanttControlTaskStartCreateEvent Type

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

Declaration

delphi

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
C++

delphi

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

cpp

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