Infralution Support

[jmaeding]

I am using object binding for my tree.
I can find in many places how to get the row and object for a given selected row, but how do I update back?

So I get the row with vtTree.SelectedRows[0] lets say.
Then I cast row.item to object type I am binding to.
Then I run a method on the object that updates itself in certain ways.
How do I shove the object back into the tree source?

I thought it would be so simple but row.item is read only.
I know how to get the trail of rows back to the source, but how do I modify the object behind the row?
This must be simple but I cannot find how to do it.
thx
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James M

[Infralution]

It depends whether you are trying to replace the object that the row represents or simply want to update some of the properties of the object and have the tree update its display. For the latter case you can simply call VirtualTree.UpdateRowData after changing the properties. If you want to replace the item with a completely different item then you need to call Row.UpdateChildren on the parent row and supply the new item as part of the parent items child collection.
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Infralution Support

[jmaeding]

its the latter case, here is my code:

[Infralution]

The code you have posted should work - assuming that the UpdateXreffed is changing some property of xdwg that is displayed in the tree. Rather than calling refDvtTree.UpdateRowData(row) for each row inside the loop it would probably be more efficient to call refDvtTree.UpdateRowData() after the loop. The parameterless version updates all displayed rows.
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Infralution Support

[jmaeding]

got it, thanks so much for replying as a lot of work hinges on redoing things.
I'll doublecheck my debugging to see why I missed that.

By the way, the tree is working really well for 90% of the program.
I have written what I would call an Explorer "extender" that uses a database to supplement info about files. I could adapt it to any kind of data really. It will make renaming dwg files much easier, as the program knows how to fix all the links that other files have to eachother.
thx
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James M

[jmaeding]

it does work of course.
I had skipped a step that made me think I was updating things wrong.
Your reponse helped immensely.
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James M