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Roland Seidel
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 Posted: Mon Apr 09, 2007 4:44 am Post subject: How to prevent TreeView scrolling left? |
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Hi everyone,
I've made a custom TreeView and recently put in autoscrolling so when
the user drags a node up the display scrolls down if necessary. I did
this by setting TopItem.
int x = TopItem->AbsoluteIndex;
if(x>0) TopItem = Items->Item[x-1];
That works fine except that if it encounters a node with long text the
display scrolls to the left hiding the +. How do I prevent this happening?
I'm guessing setting TopItem is calling some form of EnsureVisible that
pushes the + out of the way so you can see more text but I don't know
how to influence that either.
thanks in advance
Roland |
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JD
Guest
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| Posted: Thu Apr 12, 2007 8:11 am Post subject: Re: How to prevent TreeView scrolling left? |
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Roland Seidel <roland (AT) redcentresoftware (DOT) com> wrote:
| Quote: |
[...] That works fine except that if it encounters a node
with long text the display scrolls to the left hiding the +.
How do I prevent this happening?
|
Try:
if( TopItem->AbsoluteIndex > 0 )
{
Perform( WM_SETREDRAW, FALSE, 0 );
TopItem = Items->Item[ TopItem->AbsoluteIndex - 1 ];
Perform( WM_HSCROLL, SB_LEFT, 0 );
Perform( WM_HSCROLL, SB_ENDSCROLL, 0 );
Perform( WM_SETREDRAW, TRUE, 0 );
Invalidate();
}
~ JD |
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Roland Seidel
Guest
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| Posted: Fri Apr 13, 2007 4:25 am Post subject: Re: How to prevent TreeView scrolling left? |
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That did the trick - thanks very much.
Roland
JD wrote:
| Quote: | Roland Seidel <roland (AT) redcentresoftware (DOT) com> wrote:
[...] That works fine except that if it encounters a node
with long text the display scrolls to the left hiding the +.
How do I prevent this happening?
Try:
if( TopItem->AbsoluteIndex > 0 )
{
Perform( WM_SETREDRAW, FALSE, 0 );
TopItem = Items->Item[ TopItem->AbsoluteIndex - 1 ];
Perform( WM_HSCROLL, SB_LEFT, 0 );
Perform( WM_HSCROLL, SB_ENDSCROLL, 0 );
Perform( WM_SETREDRAW, TRUE, 0 );
Invalidate();
}
~ JD
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