TdxGanttControlTaskPercentCompleteStartChangeEvent Type

Performs a set of actions before a user changes task progress with a mouse drag-and-drop operation.

Declaration

TdxGanttControlTaskPercentCompleteStartChangeEvent = procedure(Sender: TObject; ATask: TdxGanttControlTask; var AAllow: Boolean) of object;

Parameters

Name	Type	Description
Sender	TObject	The Chart View that raised the event.
ATask	TdxGanttControlTask	The task whose progress is about to be changed.
AAllow	Boolean	If True, a user can move the mouse pointer to the left or right over the task’s bar (while holding down the left mouse button) to change the progress percentage. If False, the operation is prohibited.

Remarks

You can open the Features Demo and modify its code. Handle the OnPercentCompleteStartChange event and use the following code snippet to forbid the progress change operation for summary tasks:

Delphi

procedure TFeaturesDemoMainForm.GanttControlViewChartStartChangePercentComplete(Sender: TObject; ATask: TdxGanttControlTask; var AAllow: Boolean);
begin
  AAllow := not ATask.Summary;
end;

C++

void __fastcall TFeaturesDemoMainForm::GanttControlViewChartPercentCompleteStartChange(TObject *Sender,
          TdxGanttControlTask *ATask, bool &AAllow)
{
  AAllow = !(ATask->Summary);
}