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Normal Topic ResizeToFitItems() with no Layout (Read 2089 times)
Joel D.
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ResizeToFitItems() with no Layout
Jun 1st, 2018 at 3:28pm
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Hi,

I have a diagram that is not using any automatic layout; the user can drop nodes onto the canvas and move them wherever they want.

I would like to call ResizeToFitItems(10.0) every once in a while so that the canvas is only as large as is necessary, however this makes the nodes move to the top-left (or the center, if I set the diagram alignment as center).

Is there a way to have the nodes not move their position, and have ResizeToFitItems() only crop to the right and bottom of the nodes?

Thanks,
Joel.
  
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Lyubo
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Re: ResizeToFitItems() with no Layout
Reply #1 - Jun 4th, 2018 at 11:34am
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Hi,

You can try to achieve this behavior by taking the content bounding rectangle and use that as the new diagram bounds, and maybe apply margins if needed, something like:

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var bounds = diagram.GetContentBounds(true, false);
bounds.Width += 10;
bounds.Height += 10;
diagram.Bounds = bounds;


Note that setting the diagram.AutoResize property to AutoResize.RightAndDown can achieve that for interactively drawn items.

Regards,
Lyubo
  
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Joel D.
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Re: ResizeToFitItems() with no Layout
Reply #2 - Jun 6th, 2018 at 12:08am
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AutoResize with RightAndDown will automatically expand the diagram to the right and down if I move a node rightward and downward. However, if I move the node back to its original location, the diagram does not contract in size; it stays at the new larger size.

I have used your code example, though, combined with a Rect.Union with the scrollviewer's viewport width and height, and I think I'm getting better results.

Thanks!
  
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