It takes 3 seconds to empty treeview...
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Mikael Till
#1 / 14
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 It takes 3 seconds to empty treeview... When I use the CLEAR metod for the NODES collection in TREEVIEW, it takes
over 3 seconds to delete 420 nodes... This is far to long time, when it
takes the same time to query the database and fill it up again! It has to be
another way to emptu the treeview!
Please advice!
/Tilly
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| Tue, 10 Oct 2000 03:00:00 GMT |
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Mark Winsal
#2 / 14
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It takes 3 seconds to empty treeview... I also posted a message on this subject in a few groups but got no response.
What I found was that since the upgrade to 5.0 this control has become
ridiculously slow. With some playing around I have found two things:
1. More than about 128 nodes causes it to slow dramatically
2. If you make the visible property false while doing operations such as
fill, clear, expand (globally) you will see a big improvement in
performance.
Unfortunately for me, even if I do (2) when filling the tree, when the
control releases control back to me, it still takes a lot of time to stop
"processing?" something. That is to say, I have regained control and in
debug see that program has started the next step, but the TreeView is still
doing something that can take 10 to 20 seconds if I have a few hundred
nodes.
Just as a side line, the whole reason I upgraded to 5.0 initially was
because this control did not work when I upgraded the MSN a few months ago.
So I got 5.0, expecting this would cure the problem, it did but at the price
that this very useful control became almost disfunctional for large data
sets.
(Contact me directly if you would like more info Mikeal)
Quote:
>When I use the CLEAR metod for the NODES collection in TREEVIEW, it takes >over 3 seconds to delete 420 nodes... This is far to long time, when it >takes the same time to query the database and fill it up again! It has to be >another way to emptu the treeview! >Please advice!
>/Tilly
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| Tue, 10 Oct 2000 03:00:00 GMT |
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Shawn Wood
#3 / 14
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It takes 3 seconds to empty treeview... Mark,
Consider loading your treeview on a background thread. At least you get
control back immediately this way! (Disclaimer: Depending on the complexity
of your project, other issues may be introduced.)
Shawn Woods
Quote: > I also posted a message on this subject in a few groups but got no
response.
> What I found was that since the upgrade to 5.0 this control has become
> ridiculously slow. With some playing around I have found two things:
> 1. More than about 128 nodes causes it to slow dramatically
> 2. If you make the visible property false while doing operations such
as
> fill, clear, expand (globally) you will see a big improvement in
> performance.
> Unfortunately for me, even if I do (2) when filling the tree, when the
> control releases control back to me, it still takes a lot of time to stop
> "processing?" something. That is to say, I have regained control and in
> debug see that program has started the next step, but the TreeView is
still
> doing something that can take 10 to 20 seconds if I have a few hundred
> nodes.
> Just as a side line, the whole reason I upgraded to 5.0 initially was
> because this control did not work when I upgraded the MSN a few months
ago.
> So I got 5.0, expecting this would cure the problem, it did but at the
price
> that this very useful control became almost disfunctional for large data
> sets.
> (Contact me directly if you would like more info Mikeal)
> >When I use the CLEAR metod for the NODES collection in TREEVIEW, it
takes
> >over 3 seconds to delete 420 nodes... This is far to long time, when it
> >takes the same time to query the database and fill it up again! It has
to
> be
> >another way to emptu the treeview!
> >Please advice!
> >/Tilly
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| Tue, 10 Oct 2000 03:00:00 GMT |
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David Phillip
#4 / 14
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It takes 3 seconds to empty treeview... I have heard (but not verified) that the treeview control can be cleared
faster if you MANUALLY remove each node. You might give this a try.
Good luck
David Phillips
Quote: > I also posted a message on this subject in a few groups but got no
response.
> What I found was that since the upgrade to 5.0 this control has become
> ridiculously slow. With some playing around I have found two things:
> 1. More than about 128 nodes causes it to slow dramatically
> 2. If you make the visible property false while doing operations such
as
> fill, clear, expand (globally) you will see a big improvement in
> performance.
> Unfortunately for me, even if I do (2) when filling the tree, when the
> control releases control back to me, it still takes a lot of time to stop
> "processing?" something. That is to say, I have regained control and in
> debug see that program has started the next step, but the TreeView is
still
> doing something that can take 10 to 20 seconds if I have a few hundred
> nodes.
> Just as a side line, the whole reason I upgraded to 5.0 initially was
> because this control did not work when I upgraded the MSN a few months
ago.
> So I got 5.0, expecting this would cure the problem, it did but at the
price
> that this very useful control became almost disfunctional for large data
> sets.
> (Contact me directly if you would like more info Mikeal)
> >When I use the CLEAR metod for the NODES collection in TREEVIEW, it
takes
> >over 3 seconds to delete 420 nodes... This is far to long time, when it
> >takes the same time to query the database and fill it up again! It has
to
> be
> >another way to emptu the treeview!
> >Please advice!
> >/Tilly
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| Tue, 10 Oct 2000 03:00:00 GMT |
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Shawn Stumbaug
#5 / 14
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It takes 3 seconds to empty treeview... Hi,
I've also "heard" that setting the sorted property to false also speeds things
up :0)
Hope this helps!
Shawn
Quote:
> I have heard (but not verified) that the treeview control can be cleared > faster if you MANUALLY remove each node. You might give this a try. > Good luck
> David Phillips
> > I also posted a message on this subject in a few groups but got no
> response.
> > What I found was that since the upgrade to 5.0 this control has become
> > ridiculously slow. With some playing around I have found two things:
> > 1. More than about 128 nodes causes it to slow dramatically
> > 2. If you make the visible property false while doing operations such
> as
> > fill, clear, expand (globally) you will see a big improvement in
> > performance.
> > Unfortunately for me, even if I do (2) when filling the tree, when the
> > control releases control back to me, it still takes a lot of time to stop
> > "processing?" something. That is to say, I have regained control and in
> > debug see that program has started the next step, but the TreeView is
> still
> > doing something that can take 10 to 20 seconds if I have a few hundred
> > nodes.
> > Just as a side line, the whole reason I upgraded to 5.0 initially was
> > because this control did not work when I upgraded the MSN a few months
> ago.
> > So I got 5.0, expecting this would cure the problem, it did but at the
> price
> > that this very useful control became almost disfunctional for large data
> > sets.
> > (Contact me directly if you would like more info Mikeal)
> > >When I use the CLEAR metod for the NODES collection in TREEVIEW, it
> takes
> > >over 3 seconds to delete 420 nodes... This is far to long time, when it
> > >takes the same time to query the database and fill it up again! It has
> to
> > be
> > >another way to emptu the treeview!
> > >Please advice!
> > >/Tilly
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| Tue, 10 Oct 2000 03:00:00 GMT |
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(Bradley Reaves
#6 / 14
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It takes 3 seconds to empty treeview... I second that suggestion. I have found that when clearing the nodes
manually it is faster.
On Fri, 24 Apr 1998 07:29:03 -0700, "David Phillips"
Quote:
>I have heard (but not verified) that the treeview control can be cleared >faster if you MANUALLY remove each node. You might give this a try. >Good luck
>David Phillips
>> I also posted a message on this subject in a few groups but got no
>response.
>> What I found was that since the upgrade to 5.0 this control has become
>> ridiculously slow. With some playing around I have found two things:
>> 1. More than about 128 nodes causes it to slow dramatically
>> 2. If you make the visible property false while doing operations such
>as
>> fill, clear, expand (globally) you will see a big improvement in
>> performance.
>> Unfortunately for me, even if I do (2) when filling the tree, when the
>> control releases control back to me, it still takes a lot of time to stop
>> "processing?" something. That is to say, I have regained control and in
>> debug see that program has started the next step, but the TreeView is
>still
>> doing something that can take 10 to 20 seconds if I have a few hundred
>> nodes.
>> Just as a side line, the whole reason I upgraded to 5.0 initially was
>> because this control did not work when I upgraded the MSN a few months
>ago.
>> So I got 5.0, expecting this would cure the problem, it did but at the
>price
>> that this very useful control became almost disfunctional for large data
>> sets.
>> (Contact me directly if you would like more info Mikeal)
>> >When I use the CLEAR metod for the NODES collection in TREEVIEW, it
>takes
>> >over 3 seconds to delete 420 nodes... This is far to long time, when it
>> >takes the same time to query the database and fill it up again! It has
>to
>> be
>> >another way to emptu the treeview!
>> >Please advice!
>> >/Tilly
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| Tue, 10 Oct 2000 03:00:00 GMT |
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Grishko Alexand
#7 / 14
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It takes 3 seconds to empty treeview... try to use API function
Declare Function LockWindowUpdate Lib "user32" (ByVal hwndLock As Long) As
Long
with hWnd of your treeview
to disable redrawing treeview control before updating nodes collection
and with 0 to enable redrawing after opdationg nodes
--
Alexandr Grishko
Quote: > When I use the CLEAR metod for the NODES collection in TREEVIEW, it takes
> over 3 seconds to delete 420 nodes... This is far to long time, when it
> takes the same time to query the database and fill it up again! It has to
be
> another way to emptu the treeview!
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| Thu, 12 Oct 2000 03:00:00 GMT |
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Kevin Buch
#8 / 14
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It takes 3 seconds to empty treeview... With TheTree.Nodes
For LCV = .Count To 1 Step -1
.Remove LCV
Next LCV
End With
MUCH faster.
On Fri, 24 Apr 1998 10:54:34 -0700, "Mikael Tilly"
Quote:
>When I use the CLEAR metod for the NODES collection in TREEVIEW, it takes >over 3 seconds to delete 420 nodes... This is far to long time, when it >takes the same time to query the database and fill it up again! It has to be >another way to emptu the treeview! >Please advice!
>/Tilly
-Kevin Buchan Senior Developer Premier Service Systems, Inc.
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| Fri, 13 Oct 2000 03:00:00 GMT |
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Roy Soltof
#9 / 14
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It takes 3 seconds to empty treeview... This is the code snippet I use to clear an array of treeview objects to
eliminate the delay while the screen would be updated after every node was
eliminated.
For Each myobject In tvwn
With myobject
.Visible = False ' This speeds up the nodes.clear
.Nodes.Clear
.Visible = True
End With
Next
Quote:
>I also posted a message on this subject in a few groups but got no
response.
>What I found was that since the upgrade to 5.0 this control has become
>ridiculously slow. With some playing around I have found two things:
>1. More than about 128 nodes causes it to slow dramatically
>2. If you make the visible property false while doing operations such as
>fill, clear, expand (globally) you will see a big improvement in
>performance.
>Unfortunately for me, even if I do (2) when filling the tree, when the
>control releases control back to me, it still takes a lot of time to stop
>"processing?" something. That is to say, I have regained control and in
>debug see that program has started the next step, but the TreeView is still
>doing something that can take 10 to 20 seconds if I have a few hundred
>nodes.
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| Fri, 13 Oct 2000 03:00:00 GMT |
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Brian Web
#10 / 14
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It takes 3 seconds to empty treeview... I use an array.
TreeView(0) is always invisible.
II use TreeView(1) as my active tree.
When its time to empty, I get rid of Tree(1). Then clear all references to
it.
Then recreate TreeView(1).
Poof! Empty tree.
Not great, but easy.
Brian Webb
Quote:
>Hi, >I've also "heard" that setting the sorted property to false also speeds
things
>up :0)
>Hope this helps!
>Shawn
>> I have heard (but not verified) that the treeview control can be cleared
>> faster if you MANUALLY remove each node. You might give this a try.
>> Good luck
>> David Phillips
>> > I also posted a message on this subject in a few groups but got no
>> response.
>> > What I found was that since the upgrade to 5.0 this control has become
>> > ridiculously slow. With some playing around I have found two things:
>> > 1. More than about 128 nodes causes it to slow dramatically
>> > 2. If you make the visible property false while doing operations
such
>> as
>> > fill, clear, expand (globally) you will see a big improvement in
>> > performance.
>> > Unfortunately for me, even if I do (2) when filling the tree, when the
>> > control releases control back to me, it still takes a lot of time to
stop
>> > "processing?" something. That is to say, I have regained control and in
>> > debug see that program has started the next step, but the TreeView is
>> still
>> > doing something that can take 10 to 20 seconds if I have a few hundred
>> > nodes.
>> > Just as a side line, the whole reason I upgraded to 5.0 initially was
>> > because this control did not work when I upgraded the MSN a few months
>> ago.
>> > So I got 5.0, expecting this would cure the problem, it did but at the
>> price
>> > that this very useful control became almost disfunctional for large
data
>> > sets.
>> > (Contact me directly if you would like more info Mikeal)
>> > >When I use the CLEAR metod for the NODES collection in TREEVIEW, it
>> takes
>> > >over 3 seconds to delete 420 nodes... This is far to long time, when
it
>> > >takes the same time to query the database and fill it up again! It has
>> to
>> > be
>> > >another way to emptu the treeview!
>> > >Please advice!
>> > >/Tilly
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| Sat, 14 Oct 2000 03:00:00 GMT |
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Michael Livingsto
#11 / 14
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It takes 3 seconds to empty treeview... Alexandr,
I USED to have the same problem Mikael did. Excellent technique!
Gratefully yours,
Michael
Quote:
>try to use API function >Declare Function LockWindowUpdate Lib "user32" (ByVal hwndLock As Long) As
>Long
>with hWnd of your treeview
>to disable redrawing treeview control before updating nodes collection
>and with 0 to enable redrawing after opdationg nodes
>--
>Alexandr Grishko
>> When I use the CLEAR metod for the NODES collection in TREEVIEW, it takes
>> over 3 seconds to delete 420 nodes... This is far to long time, when it
>> takes the same time to query the database and fill it up again! It has to
>be
>> another way to emptu the treeview!
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| Mon, 16 Oct 2000 03:00:00 GMT |
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Michael Livingsto
#12 / 14
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It takes 3 seconds to empty treeview... Alexandr,
I USED to have the same problem that Mikael does. Excellent technique!
Gratefully yours,
Michael
Quote:
>try to use API function >Declare Function LockWindowUpdate Lib "user32" (ByVal hwndLock As Long) As
>Long
>with hWnd of your treeview
>to disable redrawing treeview control before updating nodes collection
>and with 0 to enable redrawing after opdationg nodes
>--
>Alexandr Grishko
>> When I use the CLEAR metod for the NODES collection in TREEVIEW, it takes
>> over 3 seconds to delete 420 nodes... This is far to long time, when it
>> takes the same time to query the database and fill it up again! It has to
>be
>> another way to emptu the treeview!
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| Mon, 16 Oct 2000 03:00:00 GMT |
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Mikael Till
#13 / 14
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It takes 3 seconds to empty treeview... Thanx!
Now it takes 0,05s to emty it...
Mikael Tilly
Quote:
>I also posted a message on this subject in a few groups but got no
response.
>What I found was that since the upgrade to 5.0 this control has become
>ridiculously slow. With some playing around I have found two things:
>1. More than about 128 nodes causes it to slow dramatically
>2. If you make the visible property false while doing operations such as
>fill, clear, expand (globally) you will see a big improvement in
>performance.
>Unfortunately for me, even if I do (2) when filling the tree, when the
>control releases control back to me, it still takes a lot of time to stop
>"processing?" something. That is to say, I have regained control and in
>debug see that program has started the next step, but the TreeView is still
>doing something that can take 10 to 20 seconds if I have a few hundred
>nodes.
>Just as a side line, the whole reason I upgraded to 5.0 initially was
>because this control did not work when I upgraded the MSN a few months ago.
>So I got 5.0, expecting this would cure the problem, it did but at the
price
>that this very useful control became almost disfunctional for large data
>sets.
>(Contact me directly if you would like more info Mikeal)
>>When I use the CLEAR metod for the NODES collection in TREEVIEW, it takes
>>over 3 seconds to delete 420 nodes... This is far to long time, when it
>>takes the same time to query the database and fill it up again! It has to
>be
>>another way to emptu the treeview!
>>Please advice!
>>/Tilly
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| Sat, 21 Oct 2000 03:00:00 GMT |
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Jerr
#14 / 14
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It takes 3 seconds to empty treeview... Since LockWindowUpdate couses repaint of all desktop with 0 parameter which
can be flickering on stressed system
I prefere to use the following:
'Freeze control
SendMessageLong Ctl.hwnd, WM_SETREDRAW, 0, 0
'Do cleanup...
'....
'Unfreeze control
SendMessageLong Ctl.hwnd, WM_SETREDRAW, 1, 0
Quote: > try to use API function > Declare Function LockWindowUpdate Lib "user32" (ByVal hwndLock As Long)
As
> Long
> with hWnd of your treeview
> to disable redrawing treeview control before updating nodes collection
> and with 0 to enable redrawing after opdationg nodes
> --
> Alexandr Grishko
> > When I use the CLEAR metod for the NODES collection in TREEVIEW, it
takes
> > over 3 seconds to delete 420 nodes... This is far to long time, when it
> > takes the same time to query the database and fill it up again! It has
to
> be
> > another way to emptu the treeview!
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| Sat, 21 Oct 2000 03:00:00 GMT |
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