CTreeCtrl and Checkboxes

[Nick Schultz]

I have a tree structure with multiple DSPs as parent nodes and their
reporting errors as the child node

for example:

|-DSP1
| |-error1
| |-error2
|
|-DSP2
|-error1
|-error2

I want to be able to have checkmarks to select DSPs only. However, if I
enable checkboxes, all items get a checkbox.

is there a way to just have the DSP items to have checkboxes?

Nick

[Joseph M. Newcomer]

Short of doing it owner-draw, no idea.
joe

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

[David Connet]

"Nick Schultz" <nick.s...@flir.com> wrote in news:eACaNsn9IHA.4492
@TK2MSFTNGP03.phx.gbl:

Yes. Enable the checkbox option and then manage all the setting of
checkboxes directly (do not use SetCheck). Checkmarks are managed using the
state attribute. So setting that to 0 will turn off the checkbox. (If I
remember, 1 == unchecked and 2 == checked - I'd have to look at the code to
verify)

Dave Connet

[Nick Schultz]

"David Connet" <st...@agilityrecordbook.com> wrote in message
news:IuZlk.17431$mh5....@nlpi067.nbdc.sbc.com...

it looks like there are only 7 states, none that deal with checkbox state:

TVIS_BOLD

TVIS_CUT

TVIS_DROPHILITED

TVIS_EXPANDED

TVIS_EXPANDEDONCE

TVIS_EXPANDPARTIAL

TVIS_SELECTED

[Volker Enderlein]

Nick Schultz schrieb:

I did have exactly the same problem yesterday and this is what I came up
with from the MSDN documentation:

To set the checkbox state:

TVITEM tvi = {0};
tvi.mask = TVIF_HANDLE | TVIF_STATE;
tvi.hItem = hParentItem;
tvi.stateMask = TVIS_STATEIMAGEMASK;
tvi.state = INDEXTOSTATEIMAGEMASK(index);
m_wndTree.SetItem(&tvi);

where and index of 0 means not to show a check box, 1 means unchecked, 2
means checked.

To get the check box state:

TVITEM tvi = {0};

// Prepare to receive the desired information.
tvi.mask = TVIF_HANDLE | TVIF_STATE;
tvi.hItem = hItem;
tvi.stateMask = TVIS_STATEIMAGEMASK;

// Request the information.
m_wndTree.GetItem(&tvi);

// Return zero if it's not checked, or nonzero otherwise.
return ((BOOL)(tvi.state >> 12) -1);

BTW you have to construct the TreeCtrl with the TVS_CHECKBOXES style.

Hope that helps, Cheers Volker

--
Volker Enderlein
Tel: +49 (0)371 53119651 Institut für Mechatronik
Fax: +49 (0)371 53119699 Reichenhainer Strasse 88
email: vol...@ifm.tu-chemnitz.de D-09126 Chemnitz

[Nick Schultz]

thanks that worked!

How do I know when a box has been checked?

I tried using TVN_ITEMCHANGED, but that handler doesn't get called when I
check the checkbox.

I suppose I could check the states of all DSP checkboxes after a NM_CLICK
message, but thats pretty troublesome and won't handle the case if the user
uses a keyboard to select the checkbox

Nick

"Volker Enderlein" <vol...@ifm.tu-chemnitz.de> wrote in message
news:eeWEUB59...@TK2MSFTNGP02.phx.gbl...

[Victor]

KB261289: http://support.microsoft.com/kb/261289

Victor

"Nick Schultz" <nick.s...@flir.com> wrote in message
news:%23UWIg39...@TK2MSFTNGP04.phx.gbl...

[Volker Enderlein]

Nick Schultz schrieb:

Hi Nick,

a word of warning after rereading the doc. If you create your TreeCtrl
with the TVS_CHECKBOXES style you may facing a wrong appearance the
first time you call your program.

The docs clearly say not to use this style when creating the TreeCtrl
but to add it later with a SetWindowLong call.

// Create tree windows.
const DWORD dwViewStyle = WS_CHILD | WS_VISIBLE | TVS_HASLINES |
TVS_LINESATROOT | TVS_HASBUTTONS;

if (!m_wndTree.Create (dwViewStyle, rectDummy, this, IDC_TREECTRL))
{
TRACE0("Failed to create tree ctrl\n");
return -1; // fail to create
}

SetWindowLong(m_wndTree, GWL_STYLE, dwViewStyle | TVS_CHECKBOXES);

[Victor]

Well, MFC CWnd::ModifyStyle method will also work pretty good:

if (!m_wndTree.Create (dwViewStyle, rectDummy, this, IDC_TREECTRL))
{
TRACE0("Failed to create tree ctrl\n");
return -1; // fail to create
}

m_wndTree.ModifyStyle(0, TVS_CHECKBOXES);

Victor