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stefski
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Link Control Points moving too far
May 27th, 2011 at 7:43am
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Hi there,

we are experiencing a problem with control points of DiagramLinks moving double distance when moving multiple selected objects.

I have managed to reproduce the behaviour in a sample application, and I have found that the problem is triggered by a combination of factors:

1) We have 2 DiagramNodes, A and B, each of which have child nodes A.1 and B.1, respectively.

2) We have a DiagramLink, connecting A.1 and B.1, with at least one control point (in addition to the start and end points).

3) A.1 and B.1 are either invisible (Visible=false) or locked (Locked=true).

4) A.1 and B.1 are attached to their parents using the DiagramNode.AttachTo() method accepting an AttachToNode enum as second argument.

Digging into the Flowchart.NET source code I find that Group.GetLinksToMove() comes to the conclusion that the control points of the link should be repositioned (for the second time), if A.1 and B.1 have a group attachment of type AttachTo.FixedCorner or AttachTo.SideMiddle and not both A.1 and B.1 are selected (which they cannot be, if they are either locked or invisible).

We consider this a bug because we do not see any circumstances in which the current behaviour makes any sense. A locked or invisible object should not be movable on its own, but it should still follow its parent (which it also does now). The problem seems to be that such objects are considered differently when it comes to moving links.

As I pointed out, I have a sample application, which I would be happy to send to you, if you provide me with a target. Smiley
  
Kind regards

Steffen Skov
OLGA Application Architect
Schlumberger Information Solutions AS
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Stoyo
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Re: Link Control Points moving too far
Reply #1 - May 30th, 2011 at 8:02am
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Ok, I was able to reproduce this even without locking A1 and B1. Our developer will investigate.

Stoyan
  
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stefski
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Re: Link Control Points moving too far
Reply #2 - May 30th, 2011 at 9:15am
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Nice!

Yes, you should be able to reproduce it if the items are locked OR invisible.

Looking forward to a solution to the issue.
  
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Steffen Skov
OLGA Application Architect
Schlumberger Information Solutions AS
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Stoyo
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Re: Link Control Points moving too far
Reply #3 - May 31st, 2011 at 11:44am
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Hi,

If you are using a custom build of the control, replace the Selection.Update method with the one from the PM page. Let me know if you need compiled assemblies.

I hope that helps,
Stoyan
  
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stefski
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Re: Link Control Points moving too far
Reply #4 - Jun 1st, 2011 at 5:54am
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Thank you, Stoyan,

we are using the official build (5.5), though, so we will just have to wait for a newer release.

I think we might be able to circumvent the problem in version 5.6.3 with a bit of modification to our code (i.e. using the new custom attachment setting when attaching child nodes to parent nodes).
  
Kind regards

Steffen Skov
OLGA Application Architect
Schlumberger Information Solutions AS
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stefski
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Re: Link Control Points moving too far
Reply #5 - Jul 5th, 2011 at 9:28am
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Hi Stoyan,

do you know roughly when we can expect a new version where this issue has been solved?
  
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Steffen Skov
OLGA Application Architect
Schlumberger Information Solutions AS
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Re: Link Control Points moving too far
Reply #6 - Jul 5th, 2011 at 11:28am
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Hi,

At some time in September. Let me know if you need compiled assemblies and I will send you ones from our daily build.

Stoyan
  
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