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Normal Topic Drawing the selection hatch (Read 2008 times)
JonathonB
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Drawing the selection hatch
Aug 22nd, 2008 at 12:18pm
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Hi,

I'm looking to have two or more nodes 'linked' to one another on the FlowChart. That is, when one node has been clicked, the others that it is linked to will display the selection hatch around themselves (each individually). This list of 'linked' nodes is stored in my own array.

I can do this by setting the 'Selected' property for the nodes that I want to be linked, but this will stop me from being able to resize the initally clicked node using the mouse. I'm not really worried about the others being selected - all I'm looking to do is give the visual impression that they are.

Each of the nodes get their drawn by ourselves so I would be able to modify the ondraw event for each of the nodes I want - but what I'm wondering is: is there any way to draw that selection box for multiple controls, but not actually select them (would this be the flowchart's on draw?)? Or would it be possible to have all controls selected, but be able to resize only one?

Has anyone come across a similar issue?

Thanks for any help,

Jonathon
  
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Stoyo
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Re: Drawing the selection hatch
Reply #1 - Aug 22nd, 2008 at 12:33pm
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Hi,

You can call the DiagramItem.DrawHandles() method from your custom draw handler.

I hope that helps,
Stoyan
  
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JonathonB
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Re: Drawing the selection hatch
Reply #2 - Aug 22nd, 2008 at 1:22pm
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Hi,

Thanks for the quick reply and advice but I am unable to find the DrawHandles() method - I probably should have mentioned I'm using the 4.2.1 version (which as far as I know is pre-DiagramItem).

Is a similar method available on 4.2.1? Smiley

Thanks,
Jonathon
  
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Stoyo
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Re: Drawing the selection hatch
Reply #3 - Aug 22nd, 2008 at 2:36pm
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It is available, however it's internal there 8) Anyway, this is how Flowchart.NET draws the hatch frame:

Code
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if (st == HandlesStyle.HatchFrame)
{
	rc.Inflate(size / 2, size / 2);

	System.Drawing.Drawing2D.HatchBrush hatchBrush =
		new System.Drawing.Drawing2D.HatchBrush(
		HatchStyle.BackwardDiagonal, Color.Black, Color.White);

	RectangleF[] rects = new RectangleF[]
	{
		new RectangleF(rc.Left + size, rc.Top, rc.Width - 2 * size, size),
		new RectangleF(rc.Left + size, rc.Bottom - size, rc.Width - 2 * size, size),
		new RectangleF(rc.Left, rc.Top, size, rc.Height),
		new RectangleF(rc.Right - size, rc.Top, size, rc.Height)
	};

	for (int i = 0; i < 4; ++i)
		graphics.FillRectangle(hatchBrush, rects[i]);

	hatchBrush.Dispose();

	return;
}


I hope that helps,
Stoyan
  
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JonathonB
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Re: Drawing the selection hatch
Reply #4 - Aug 22nd, 2008 at 2:41pm
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I was just eyeing up that part of the mindfusion code (noticed it was internal though) Smiley

That should hopefully solve what I'm looking to do.

As usual, thank you very much Stoyan
  
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