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Nedor
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Delete large sets of nodes/connections
Aug 6th, 2010 at 8:28am
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Hi @ all.

I have to implement some own reloading algorithm because i need to hold only important (currently viewed) data.

In some cases i have to unload the data which is currently not shown. But this is my problem. If i have to remove all datain a loop with:
m_Diagram.Nodes.Remove(...)
m_Diagram.Links.Remove(...)
it will be really slow. If i remove all the data with ClearAll its fast, but i have to reload the data which is currently viewed. Is there any way for fast removal of many nodes/links. Maybe some other suggestions to solve this problem?

(Sorry for my bad english, but i am not a native english speaker/writer)
  
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Stoyo
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Re: Delete large sets of nodes/connections
Reply #1 - Aug 6th, 2010 at 8:42am
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Hi,

Try copying the important data to a second diagram and assigning it to the view. You can just discard the old diagram then. You could reuse the CopySelection and PasteSelection methods from the Diagram class to implement that more easily. Calling CopySelection, ClearAll and PasteSelection on the same diagram might work too, but I haven't tried it.

I hope that helps,
Stoyan
  
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Nedor
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Re: Delete large sets of nodes/connections
Reply #2 - Aug 6th, 2010 at 10:19am
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Hmm... if i change the whole Diagram all current active operations will be cancelled (Moving, Resizing, Inplace Edit and so on).

But if there are no other ways, i have to set a Tag (OperationActive) and disable the unload function during such user actions.
  
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Stoyo
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Re: Delete large sets of nodes/connections
Reply #3 - Aug 6th, 2010 at 11:00am
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Yes, this might be necessary if replacing the whole diagram and it's possible for the user to modify it during that time (which you might prevent by setting the view.Behavior to DoNothing)

Another thing you might try is deleting the unimportant items asynchronously from a timer. E.g. set Visible = false for items that will be deleted to hide them immediately from the user, and have a timer event delete a few invisible items on each tick if the user is not doing any manipulations.

Stoyan
  
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