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Treeview slow when refreshing its contents |
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od@eureka 
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Joined: 15 December 2009 Location: France Status: Offline Points: 4 |
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 Topic: Treeview slow when refreshing its contentsPosted: 15 December 2009 at 10:58am |
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I have to refresh the contents of a Treeview :
- by default, it show all values (approximativly 1500 nodes)
- when using filters, users can reduce the number of nodes to a subset of 150 or less
I do a small test:
myTreeView.Nodes.Clear
Dim i As Integer For i = 1 To 100 myTreeView.Nodes.Add Parent, xtpTreeViewChild, i, "line " & CStr(i), 3 Next --> it is very slowly the 2nd or more times...(> 4 sec !!!) How to do to go faster ? (the first time, for 1500 nodes, it takes only 1 sec )
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Regards
Didier |
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Oleg
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Joined: 21 May 2003 Location: United States Status: Offline Points: 11234 |
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Posted: 16 December 2009 at 5:46am |
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Hi,
You can try WM_SETREDRAW API message:
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
Const WM_SETREDRAW = &HB Private Sub Command1_Click() SendMessage myTreeView.hwnd, WM_SETREDRAW, 0, 0 myTreeView.Nodes.Clear
Dim i As Integer For i = 1 To 1000 myTreeView.Nodes.Add Parent, xtpTreeViewChild, i, "line " & CStr(i), 3 Next SendMessage myTreeView.hwnd, WM_SETREDRAW, 1, 0 End Sub |
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Oleg, Support Team
CODEJOCK SOFTWARE SOLUTIONS |
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od@eureka
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Joined: 15 December 2009 Location: France Status: Offline Points: 4 |
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Posted: 16 December 2009 at 8:11am |
 Thank you for the solution that solves well the response time ...
But unfortunately, after several calls of myTreeView.Nodes.Clear(), I have an error code 80010108 ...
--> Is there another way to empty the entire TreeView?
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Regards
Didier |
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Baldur
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Joined: 22 November 2006 Location: Germany Status: Offline Points: 244 |
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Posted: 04 January 2010 at 4:39am |
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I got the same error including crash of the application if i often use the clear-method.
It's faster and also save to remove the nodes, but from last node to first node !
Also use in this case the WM_SETREDRAW.
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Oleg
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Joined: 21 May 2003 Location: United States Status: Offline Points: 11234 |
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Posted: 05 January 2010 at 8:22am |
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do you have last version, it was minor problem with Clear method but it have to be fixed in 13.2.x
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Oleg, Support Team
CODEJOCK SOFTWARE SOLUTIONS |
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Baldur
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Joined: 22 November 2006 Location: Germany Status: Offline Points: 244 |
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Posted: 06 January 2010 at 12:40pm |
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I'm still waiting for 13.2.2 now because i have actually no issues ;)
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