Thursday, July 22, 2010Collision detect of TimeItems in a Gantt chartThe GTP.NET will order the colliding time items in separate sub columns. The way this is done is fully automatic and the result will be something like this:
But what if you would rather to have the Top time item at the bottom? One way is to re-order the SubColumn values after the collision detection is done. Go like this: 1: Private _CollisionDetectNeedUpdate As Boolean 2: 3: Private Sub OnCollionsDetect(ByVal aGantt As PlexityHide.GTP.Gantt, 4: ByVal e As PlexityHide.GTP.CollisionDetectEventArgs) 5: _CollisionDetectNeedUpdate = True 6: End Sub 7: 8: Private Sub Gantt1_OnTimeItemAreaPaintBackground(ByVal aOffscreenDraw As 9: PlexityHide.GTP.OffscreenDraw, ByVal e As PlexityHide.GTP.OffscreenDrawArgs) 10: Handles Gantt1.OnTimeItemAreaPaintBackground 11: If (_CollisionDetectNeedUpdate And 12: Gantt1.Grid.RootNodes.Count > 0 And Gantt1.MouseMoveKind = MouseMoveKind.none) Then 13: Dim gr As GanttRow = Gantt.GanttRowFromGridNode(Gantt1.Grid.RootNodes(0)) 14: 15: For i = 0 To gr.Layers(0).Count - 1 16: gr.Layers(0).Item(i).SubCol = 1 + gr.SubColumnsFromCollisionDetect - 17: gr.Layers(0).Item(i).SubCol 18: Next 19: _CollisionDetectNeedUpdate = False 20: End If 21: 22: End SubAnd then you have a result that looks like this:
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