Hello,

I have a gridlane diagram on which I need to allow the user to select continuous cells and "merge" them like excel.

I'm taking a look and it seems that this control doesn't allow that kind of operation, not even multiselect of cells (needed to allow the user to select what cells he wants to merge).

Anyone has any suggestion about how this kind of feature could be accomplished?
Thank you in advance
Regards
Gabriel

Hello,

That is great!!
Thank you very much.

However I have two issues with the solution.
1) The cells inside a "merged block" can also be selected individually. Nevertheless, I think I can solve this with some similar "trick".

2) If the cells has a "text", how can I write the text to a "merged block" as it is considered as just one cell? (i.e. the text flows for all cells.

Again, thank you very much for you support.
Regards
gabriel

Hello,
Again, thank you very much for the support.
It works perfectly. I had to modify it to adjust some behaviors (like selecting the merge cells like excell) and added code to "unmerge" cells, but it works

About the text on top the grid headers, that is a problem, but maybe there is a way to know if the "cells" that are under the merged cell are currently visible, and if not (because they are under the "header", just avoid draw the text of the mergeblock.
What do you think?

Again, thank you.

Regards
Gabriel

Hi,

In this sample there is no specific reason for HeadersOnTop to be false other than for testing purposes. If HeadersOnTop is set to true, then the grid headers are displayed on top of all diagram items. This includes the special transparent node that is used to custom-draw the texts of the merged cell blocks. I must have forgotten HeadersOnTop=false which resulted in texts displayed on top of the headers.

I hope this helps.

Regards,
Meppy

Hi,

Try the following custom behavior:

class SelectBehavior : ModifyBehavior
{
	public SelectBehavior(DiagramView diagramView)
		: base(diagramView)
	{
	}

	public override InteractionState StartDraw(PointF point)
	{
		InteractionState state = base.StartDraw(point);

		if (state.CurrentItem == Diagram.Selection &&
			Diagram.GetItemAt(point, true) == null)
		{
			RectangleF bounds = RectangleF.Empty;
			if (Diagram.LaneGrid.GetCellFromPoint(point, ref bounds) != null)
				return null;
		}

		return state;
	}
} 

This behavior removes the multiple selection aspect of the default Modify behavior when the user clicks and drags over the lane grid. The multiple selection still occurs when the click happens outside of the grid.

Assign an instance of this behavior to the DiagramView object:

diagramView1.CustomBehavior = new SelectBehavior(diagramView1); 

Finally, in the DiagramView.MouseDown handler do not initiate cell selection if the click was above an item:

...
if ((cell = laneGrid.GetCellFromPoint(point, ref bounds)) != null[b]&&
	diagram1.GetItemAt(point, true) == null)
... 

Let me know if this helps.

Regards,
Meppy

Hello,

I've just noticed that the right click event is only ignored if the diagramView.ContextMenuStrip variable is not null.

Is there any way to avoid this behavior, so I can capture the right click event AND add the contextmenustrip?

thank you
Gabriel