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How to have a NodeLink which 'knows' what it is associated with (application data) (Read 3129 times)

AR Junior Member Offline I Love MindFusion! Posts: 65 Joined: Jan 23^rd, 2015	How to have a NodeLink which 'knows' what it is associated with (application data) Feb 18^th, 2015 at 10:59am	Print Post
	When creating NodeLinks between (custom) Nodes on the diagram I associate some application data with the link (by catching the 'LinkCreated' event and running some custom code). I can store this data via the (custom) Nodes being linked - but my problem is, if there are multiple links between the same two nodes, with different application data associated with them, how do I determine which link has which data associated with it. I tried NodeLink.getId() but this always seems to return null. Is there some 'id' type information on a node link that I can associate with the application data to allow me to match the links reliably with their associated application data? Alternatively can I create a 'custom' NodeLink which would automatically be created (or I could set up to be created) when I link my nodes, which I could then store the application data?


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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: How to have a NodeLink which 'knows' what it is associated with (application data) Reply #1 - Feb 18^th, 2015 at 11:16am	Print Post
	You could associate the information with links instead of nodes, by setting links' Tag or Id properties. The control won't automatically set Id, both Tag and Id are used for storing custom data. I hope that helps, Stoyan


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AR Junior Member Offline I Love MindFusion! Posts: 65 Joined: Jan 23^rd, 2015	Re: How to have a NodeLink which 'knows' what it is associated with (application data) Reply #2 - Feb 19^th, 2015 at 12:10pm	Print Post
	Thanks - using the 'Tag' property works beautifully and is easy to serialize/deserialize to XML (In the JavaDoc the detailed description for setId() on DiagramItem appears to be an exact copy of that for setTag() - is this correct?)


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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: How to have a NodeLink which 'knows' what it is associated with (application data) Reply #3 - Feb 19^th, 2015 at 12:32pm	Print Post
	Yes, the only difference between Id and Tag properties is the name. You could use them like custom-data-1 and custom-data-2 objects, but might prefer one over the other if it makes more sense for your application to treat the data as identifier or additional description semantically.


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