How to handle tri-checkbox states in ctreectrl in MFC?

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Hi,
I created tri-state Ctreectrl in MFC, But while clicked on checkbox state is not updating on same instance.
For e.g. I checked on checkbox but by using GetItemState() i'm getting 1 for each item. If same item i'm unchecking i'm getting checked. So, It is returning Old state I trying to get new state. Can anybody help me out by some code snippet ?

What I have tried:

I checked on checkbox but by using GetItemState() i'm getting 1 for each item. If same item i'm unchecking i'm getting checked. So, It is returning Old state I am trying to get new state.

[EDIT by Jochen Arndt: Copied from comment]

C++

ITreeCtrl m_FiletreeCtrl = DEBUG_NEW ITreeCtrl;
HTREEITEM hItem = m_FiletreeCtrl->GetTreeCtrl().HitTest(point, &flags);
HTREEITEM hItem2 = m_FilestreeCtrl->GetTreeCtrl().GetParentItem(hItem);
HTREEITEM hChildItem = NULL;
while(hItem22 != NULL)
{
    hChildItem = m_FilestreeCtrl->GetTreeCtrl().GetChildItem(hItem22);
    while(hChildItem)
    {
        UINT nCurrentState = (m_FilestreeCtrl->GetTreeCtrl().GetItemState(hChildItem,TVIS_STATEIMAGEMASK)>>0xC);
    }
}

In this Tree I just want to know how many Items are checked, but GetItemState is returning Old state.
[/EDIT]

Posted 30-Nov-17 19:29pm

Rais Shaikh

Updated 30-Nov-17 23:00pm

Jochen Arndt

v3

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Jochen Arndt 1-Dec-17 3:19am

Where and when do you call GetItemState()?

Without seeing the used code it is impossible to help.

Rais Shaikh 1-Dec-17 4:18am

ITreeCtrl m_FiletreeCtrl = DEBUG_NEW ITreeCtrl;
HTREEITEM hItem = m_FiletreeCtrl->GetTreeCtrl().HitTest(point, &flags);
HTREEITEM hItem2 = m_FilestreeCtrl->GetTreeCtrl().GetParentItem(hItem);
HTREEITEM hChildItem = NULL;
while(hItem22 != NULL)
{
hChildItem = m_FilestreeCtrl->GetTreeCtrl().GetChildItem(hItem22);
while(hChildItem)
{
UINT nCurrentState = (m_FilestreeCtrl->GetTreeCtrl().GetItemState(hChildItem,TVIS_STATEIMAGEMASK)>>0xC);
}
}

In this Tree I just want to know how many Items are checked, but GetItemState is returning Old state.

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Jochen Arndt · Accepted Answer · 2017-11-30T22:58:00

Solution 1

Code from comment:

UINT nCurrentState = (m_FilestreeCtrl->GetTreeCtrl().GetItemState(hChildItem,TVIS_STATEIMAGEMASK)>>0xC);

You are not querying a check box state but the state image index. This index defines which image from the state image list is actually shown. By convention an index of zero indicates that there is no state image. An index of one (as detetected by you) is for the unchecked image. See also How to Work With State Image Indexes (Windows)[^].

Posted 30-Nov-17 22:58pm

Jochen Arndt

Comments

Rais Shaikh 1-Dec-17 6:31am

Thanks for solution. Then how i will get selected count from Tree.

Jochen Arndt 1-Dec-17 6:46am

You are welcome and thank you for accepting my solution.

You have to iterate over the nodes starting at the root (or any defined node) and increment a count variable when an item is checked. Just search the web for something like "ctreectrl iterate" or "ctreectrl enumerate".