Re: You should call ModifyStyle() member function of CTreeCtrl to set the style.

From:

Ali BEN MAHMOUD <ali.ensi@yahoo.fr>

Newsgroups:

microsoft.public.vc.mfc

Date:

Mon, 21 Nov 2011 11:29:56 GMT

Message-ID:

<201111216296usenet@terrranews.com>

Thank Shoaib.
Your response is exactly what I am seeking for :)

On Wednesday, May 14, 2008 11:01 AM PRMARJORA wrote:

Im using a MFC CTreeView which fits nicely with what im trying to do. I need
to change the style of the nested CTreeCtrl.

There is no easy way to do this, the documentation points to using
SetWindowLong.

void CMyTreeView::OnInitialUpdate()

{

CTreeView::OnInitialUpdate();

CTreeCtrl& tree = GetTreeCtrl();

HTREEITEM root_item = tree.InsertItem(CString("MyProject"));
HTREEITEM init_request = tree.InsertItem(CString("Item 1"), root_item);
HTREEITEM doc_package = tree.InsertItem(CString("Item 2"), root_item);

ASSERT(tree.GetSafeHwnd() != NULL );

}

Iv tried using this to set the styles as in the above code, but the program
gets corrupted.

How can i set the style of a CTreeCtrl nested in a CTreeView?

On Wednesday, May 14, 2008 11:10 AM M. Shoaib Surya wrote:

You should call ModifyStyle() member function of CTreeCtrl to set the style.
The following line of code should achieve your purpose.

tree.ModifyStyle(NULL, TVS_HASLINES |TVS_LINESATROOT);

Regards,
Shoaib.

"PRMARJORAM" <PRMARJORAM@discussions.microsoft.com> wrote in message
news:7A2A351F-F074-48AA-8D67-B0EFC1C2A298@microsoft.com...

On Wednesday, May 14, 2008 11:18 AM M. Shoaib Surya wrote:

Also, the call to the OnInitialUpdate() of the base class, that is, the
following line of code,
CTreeView::OnInitialUpdate();
should be the last line of the overridden CMyTreeView::OnInitialUpdate()
instead of the first line

- Shoaib

"M. Shoaib Surya" <shoaibsurya@hotmail.com> wrote in message
news:OYueoWdtIHA.4560@TK2MSFTNGP03.phx.gbl...

On Wednesday, May 14, 2008 12:03 PM PRMARJORA wrote:

Thanks ill look into that modify style, looks alot better...

I have cracked it though now, needed to do the following
LONG style = ::GetWindowLong(tree.GetSafeHwnd(),GWL_STYLE);

TVS_HASLINES |TVS_LINESATROOT);

So needed to combine the current style with the additions.

"M. Shoaib Surya" wrote:

On Wednesday, May 14, 2008 12:42 PM Joseph M. Newcomer wrote:

See below...
On Wed, 14 May 2008 08:01:02 -0700, PRMARJORAM <PRMARJORAM@discussions.microsoft.com>
wrote:

****
(a) this is not good style for setting styles. You have cleared ALL the style bits,
EXCEPT the two you set. At the VERY MINIMUM this code should say

DWORD style = tree.GetStyle();
style |= TVS_HASLINES | TVS_LINESATROOT;

but why go through all that work? Instead, just call

tree.ModifyStyle(0, TVS_HASLINES | TVS_LINESATROOT);

which should be sufficient (no need to get the old style, etc.)
joe
****
Joseph M. Newcomer [MVP]
email: newcomer@flounder.com
Web: http://www.flounder.com
MVP Tips: http://www.flounder.com/mvp_tips.htm

On Wednesday, May 14, 2008 1:40 PM PRMARJORA wrote:

Exactly,

i was looking for a method something like SetStyle, then looking at the msdn
documentation for using CTreeCtrl, stated had to use SetWindowLong

I could not believe they had left something so fundamental out of the class
interface, they had not...

"Joseph M. Newcomer" wrote:

On Wednesday, May 14, 2008 7:52 PM David Connet wrote:

=?Utf-8?B?UFJNQVJKT1JBTQ==?= <PRMARJORAM@discussions.microsoft.com>
wrote in news:7A2A351F-F074-48AA-8D67-B0EFC1C2A298@microsoft.com:

The easiest way is to override PreCreateWindow:

BOOL CMyTreeView::PreCreateWindow(CREATESTRUCT& cs)
{
    cs.style |= TVS_HASLINES | TVS_LINESATROOT;
    return __super::PreCreateWindow(cs);
}

Some styles need to be done in OnInitialUpdate (or OnCreate)
[I just copied some listview code for an example]
    GetListCtrl().SetExtendedStyle(GetListCtrl().GetExtendedStyle() |
LVS_EX_FULLROWSELECT);

Dave Connet

On Wednesday, May 14, 2008 11:39 PM Joseph M. Newcomer wrote:

They didn't. This is a documentation error, and I will add it to my list of documentation
errors.
joe

On Wed, 14 May 2008 10:40:01 -0700, PRMARJORAM <PRMARJORAM@discussions.microsoft.com>
wrote:

Joseph M. Newcomer [MVP]
email: newcomer@flounder.com
Web: http://www.flounder.com
MVP Tips: http://www.flounder.com/mvp_tips.htm