TdxGanttControlTaskResizeEvent Type

Performs a set of actions during a task size change with the mouse.

Declaration

delphi

TdxGanttControlTaskResizeEvent = procedure(Sender: TObject; ATask: TdxGanttControlTask; ANewFinish: TDateTime; var AAccept: Boolean) of object;

Parameters

Name	Type	Description
Sender	TObject

The Chart View that raised the event.

| | ATask | TdxGanttControlTask |

A task that a user resizes.

| | ANewFinish | TDateTime |

ATask‘s new finish date.

| | AAccept | Boolean |

Specifies if the event handler accepts or declines the task resize operation in response to a mouse drag-and-drop action.

Remarks

You can open the Features Demo and modify its code. Handle the OnTaskResize event and use the following code snippet that prevents users from decreasing a task duration to zero days:

Delphi
C++

delphi

procedure TFeaturesDemoMainForm.GanttControlViewChartTaskResize(Sender: TObject; ATask: TdxGanttControlTask; ANewFinish: TDateTime; var AAccept: Boolean);
begin
  AAccept := ANewFinish - ATask.Start > 0;
end;

cpp

void __fastcall TFeaturesDemoMainForm::GanttControlViewChartTaskResize(TObject *Sender, TdxGanttControlTask *ATask,
          TDateTime ANewFinish, bool &AAccept)
{
  AAccept = (ANewFinish - ATask.Start) > static_cast<TDateTime>(0);
}