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Updating a Gantt chart dynamically

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GanttView
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Steve
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Steve asked on 22 May 2014, 06:17 PM
We'd like to add child elements to task items dynamically (post-initialization.)

Using a View-ViewModel, if I modify a given GanttTask element (which previously had no children) to add childr tasks, I see the following behavior:
- the "gantt" part of the UI changes from a text box to a ranged line
- the underlying ObservableCollection has the correct data
- however, the tree control (the part of the control that allows expand/collapse) does not appear to recognize that child tasks have been added; as a result it is impossible to view the child tasks that have been added.

How do we do this properly so the control recognizes the new child elements?

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Polya
Telerik team
answered on 26 May 2014, 10:42 AM
Hello Steve,

The issue might occur because whenever a child GanttTask is added in the parent GanttTask we should notify for the change of the TaskSource collection.
You can take a look at our First Look demo from our QSF demos where we can add a child GanttTask at run-time when clicking on the "Add child to selected item" button.
When pressing that button the AddCommand is executed that calls the AddExecuted  method. In this method we add a new GanttTask to the selected GanttTask and then we call OnPropertyChanged(() => Tasks); to notify for the Tasks collection changed.

Regards,
Polya
Telerik
 
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Polya
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