How come in my CTreeCtrl SetCheck doesn't work?

[ken pat]

When I am populating my CTreectrl with nodes (which is done from the MyCFormView::OnInitialUpdate()) - right after I do InsertItem - I then do SetCheck - yet this doesn't show the item checked when the application goes up. Note that right after a SetCheck I do a GetCheck to see that it was checked and it shows that it is. Does anyone know why??


HTREEITEM moduleItem=m_TreeCtrl->InsertItem(&insertStr);
m_TreeCtrl->SetCheck(moduleItem,TRUE );

[BeePo]

hmm...
m_TreeCtrl.SetCheck(hItem,TRUE);

that should work. how do you set your checkboxes for your treectrl?
did you draw your own?

if so try it

m_TreeCtrl.SetItemState(
hItem// item
,INDEXTOSTATEIMAGEMASK(UNCHECK),//UNCHECK here is 1, the image index. 2 for check, hey that's depend on your BMP image
TVIS_STATEIMAGEMASK // saying you want to change state image to treectrl, there is another image, normal image, you dont' want to change that. 
);

good luck

[pgnanaprakash]

Hi,

Please try this link

http://www.codeguru.com/forum/showt...eeCtrl+SetCheck

With Regards
Prakash

[gstercken]

Originally posted by pgnanaprakash
Hi,

Please try this link

http://www.codeguru.com/forum/showt...eeCtrl+SetCheck

With Regards
Prakash

What's the point in bringing up all those old posts with the same question and giving a reference to the same thread (with a link which doesn't work, BTW) five times in a row?

[Mza]

Does anybody know a solution for the above problem. The frustrating part is that in some cases the checkboxes are actually checked but most of time not. And I do exactly the same (I made a function to check all the tree items). Is this a bug, or is there just something I forgot.

[KeyserSoze]

I am currently having the same problem.

I'm setting them to true in the OnInitDialog() of my PropertyPage.
If I call GetCheck() immediately after, I get the correct result, but the checks are not drawn.

I'm simply using the TVS_CHECKBOXES style, and SetCheck(). No funny business. I've done it a gazillion times before without hickups...

Most curious.

I'm running XP, Visual Studio 6.

[BeePo]

really... i never have any problem..
did you forget to update the dialog?
sometime i dont' forget to call UpdateData() and wondering why all those data didn't get change eventhough I code were right.
So check if you have called UpdataData() first.

[Mza]

I must admit that I never used updateData(), but somehow all my tree items get added just fine. The only problem is the getCheck() operation. I tried adding updateData() but unfortunately that does not work either. In the OnInitDialog() function from my dialog that contains my tree I call the following (simplified) function:

void CGroups::updateTree(CMyTreeCtrl *a_tree)
{
	a_tree->DeleteAllItems();

	std::map<int,CGroup>::iterator g_pos = this->m_groups.begin();
	while (g_pos != this->m_groups.end())
	{
		HTREEITEM hGroup = a_tree->InsertItem(g_pos->second.text);
		a_tree->SetCheck(hGroup,g_pos->second.visible);
		g_pos++;
	}
	
	a_tree->UpdateData();
}

The real function is somewhat more complex with more loops for deeper levels of the tree but I use the same method for setting the checkbox. I also have a function that manually updates all the checkboxes from an administration, and the funny thing is that it only works when I call that function from the tree function OnNMClick. I tried calling that same function from different places but then it does not work.

[KeyserSoze]

Mza,

Have you figured this out yet? I'm doing almost exactly what you're doing, and am having the same issue.

I've tried UpdateData(TRUE/FALSE), RedrawWindow(), Invalidate(), etc. etc. still no luck.

I've since moved on to other tasks and figured I'd come back to this.

Have you had any luck in the past few days?

Regards,

Morgan

[KeyserSoze]

Ok, I've figured out how to get this to work.

In my OnInitDialog(), just before calling my routine that populates and checks the tree ctrl, I added:

//remove and add the checkbox style.
m_ctrlTree.ModifyStyle( TVS_CHECKBOXES, 0 );
m_ctrlTree.ModifyStyle( 0, TVS_CHECKBOXES );

That did it for me. Apparantly it's not enough to have the style specified in your resource file.

Hope this helps others who are frustrated by this

[Mza]

He thanks KeyserSoze , your solution works great. Finally my tree does exactly what I want.

[pocjoc]

The most strange problem is solved with the most strange solution.

Thanks, it works great for me