Printable View
Does anyone out there know how can get a tree-view to allow mutliple selections within a level (for the purpose of dragging and dropping the selected items to a new "parent")?
For example, if I have the following structure:
A
-1
-2
-3
B
-4
-5
-6
and I want to multi-select and drag items 4 and 5 to level A, how would I do this? (I already have single-selection drag and drop working).
To determine what items are selected in a tree view you need to loop through the nodes and test the "selected" attribute. Keep a list (either in an array or a collection) of those that are selected so you can perform the drag you want.
Only listview can allow mutliselect, you may make a combination of treeview-listview and then drag the listitems to a node
Thanks for the responses, guys, but:
Gen-X: I wish it was that easy, but I don't beleive multiple nodes can be the "SelectedItem".
Kedaman: Point taken, but I was hoping to stick only with the tree-view; and was wondering if some kind of API function can be used to give it the functionality I'm looking for.
Appologies... I was thinking of listview when you said it...
Unfortunately API calls can NEVER give functionality to controls like that... the controls are already set and while you might be able to tinker with external things (or replicate things a user could do programmatically) you can't actually use an API call to "suddenly" allow a tree-view to select multiples.
Either the control (TreeView) is programmed to allow multiple or it isn't... if an API call could make it DO multiples then the control would have been coded to do it in the first place.
Sorry
I hear you, Gen-X. While I'm not an API guru, I do know that some VB controls are "dumbed down", and you can use API calls to take advantage of their full functionality (i.e., functionality that is not exposed by the VB properties).
I had to use an API call (SendMessage with a "scroll" parameter) to get the TreeView to scroll during a drag and drop operation (using the technique recommended by Microsoft). This technique is somewhat involved in that the call is made within a Timer event when the MouseOver event detects that the mouse is close to either the top or bottom of the TV control.
Anywho, I seem to recall using an app that allowed multiple selection of TreeView nodes, but it might have been a "home-grown" tree-view. I just tried to multi-select in Windows Explorer and couldn't do it. I know that this issue has been raised in other forums, but I have not seen a solution; but I have a nagging feeling that it is possible.
Oh well, I'll continue my quest ...
Exactly.
The Scoll is a function that a user could do (ie someone with a scroller on their mouse) and so you could replicate it.
Unfortunately you cannot replicate something that is NOT possible regardless what user controls or movements of mouse/keyboard you have.
an excellent alternative to the treeview is the on the vb-accelarator site. All source is provided and there is no royalties or anything. Better still, the code is mostly fantastic. (The stuff that is not fantastic is only excellent).
I'll put a link to the site below. Then just search the site for treeview as there are about three modules you'll need to download.
http://vbaccelerator.com/linktome.htm
You have to see the demo to realise how good the control really is. I have had 0 defects using this control to date.
I hope you take a look!
Rwgards
Paul Lewis