TMSFNCGantt: Prevent Parent Task PlannedStart/PlannedEnd from Being Overridden by Child Tasks

FNC TMS FNC Gantt Chart
1

When using TMSFNCGantt, if I create a parent task ( MainTask ) with both PlannedStart and PlannedEnd set, then add a single child task ( subTask ), the Gantt chart ignores the parent’s PlannedStart/PlannedEnd and instead adopts the dates from the child task.

Initial value setting

// initial value setting
procedure TForm1.FormShow(Sender: TObject);  // date value setting
begin
  TMSFNCGanttChart1.Project.Tasks.Clear;
  mainDtStart := IncDay(Now, 0);            //  public var
  mainDtEnd := incDay(mainDTStart,5);       //  public var
  subDtStart := IncDay(mainDtStart,10);     //  mainDtStart + 3
  subDtEnd := incDay(subDtStart,15);        //  mainDtEnd + 3
end;

After adding only the parent task

procedure TForm1.SpeedButton1Click(Sender: TObject);
begin
  TMSFNCGanttChart1.BeginUpdate;
  mainT := TMSFNCGanttChart1.Project.AddTask('MainTask','MainTask');
  mainT.PlannedStart := mainDtStart;
  mainT.PlannedEnd := mainDtEnd;
  TMSFNCGanttChart1.EndUpdate;
end;

image
image687×188 6.48 KB

After adding the child task

procedure TForm1.SpeedButton2Click(Sender: TObject);
begin
  TMSFNCGanttChart1.BeginUpdate;
  subT := mainT.AddSubTask('subTask','subTask');
  subT.PlannedStart := subDtStart;
  subT.PlannedEnd := subDtEnd;
  TMSFNCGanttChart1.EndUpdate;
end;

image
image877×204 8.78 KB

Is there a way to prevent the parent task’s PlannedStart and PlannedEnd from being overwritten on the Gantt chart?
In Microsoft Project this would be equivalent to setting the parent task’s mode to Manual.

image
image1200×380 34.2 KB

In our workflow, managers create the parent tasks while individual team members add their own child tasks, so it is crucial for us to detect whenever a sub-task’s PlannedStart or PlannedEnd falls outside the parent task’s date range.

2

For the moment this is not yet posiible.
We can invastigate to implement this in one of the next versions of the TMS FNC Gantt Chart.