RadiantQ Forum

Raja,

I sent a link to a sample project on friday to support@radiantq.com.

Best regards

Raja,

Thank you for the reply.
Please let me know, when the issue is fixed. We need it urgently.

Best regards

Hello,

we have a FlexyGantt with OverlappedTasksRenderingOptimization="ShrinkHeight" and a RowHeigtConverter. So if some tasks overlap the row height increases.
The user can collapse a row of the gantt via a toggle button.
To do this, TaskListBinding is bound to a CollectionView of the task items and the CollectionView filters all tasks out, resulting in MaxOverlappingBlocksRowCount set to 1.

The problem is that when the user expands the row MaxOverlappingBlocksRowCount is still 1 and the row cannot be calculated with the correct height.

I looked into the code and when the filter of the CollectionView is changed the event OnItemsChanged() in ChartChildren class is fired.

else if (e.Action == System.Collections.Specialized.NotifyCollectionChangedAction.Reset)
{
    this.blocks.Clear();
}
this.UpdateMaxOverlappingTasksCount();

When this.UpdateMaxOverlappingTasksCount() is called, this.blocks is empty and results in MaxOverlappingBlocksRowCount set to 1. The same action is fired when the filter repopulates the CollectionView.

The Microsoft documentation for NotifyCollectionChangedAction.Reset states:
"The contents of the collection changed dramatically."
This means that a large change occurred in the collection and it should be reevaluated completely. This can be a Clear() but it can also be a changing filter.

For a test I added the items again (e.NewItems is null in this case):
else if (e.Action == System.Collections.Specialized.NotifyCollectionChangedAction.Reset)
{
    this.blocks.Clear();

    //test: readd items
    if (tasksPanel != null)
    {
        foreach (TaskItemControl child in tasksPanel.Children)
            this.OnNewEntityAdded(child);
    }
}

This solved my issue, all items get added again when the filter adds them.
Would be great if you could include this fix.

Best regards

Jan,

We have a plan to release before the end of the year. But we are not sure with the requested feature, will try to include it if possible.

Thanks,
Raja

Hi Jan,

We have this feature in our Roadmap, there is a complexity to support both Virtualization and Overlapping feature together. Anyway, we will give our best to support it and update you.

Thanks,
Raja