Re: CTreeCtrls

From:

Dan Bloomquist <public21@lakeweb.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Thu, 20 Mar 2008 20:55:56 GMT

Message-ID:

<TbAEj.206$Cn4.120@news02.roc.ny>

M.P. wrote:

Hi all,

I was trying to copy one tree control into another, but soon found an
error

CTreeCtrl x;
CTreeCtrl y;

//.. load x with stuff

y = x; // ERROR - this cannot be done (life is not so simple)

Is there a way to do this easily?

No, but I thought it would be fun to try and it may go something like
this. Note, I have not tested this other than to see it compiles. And
something doesn't look quite right:

//start post
/*
Here is where I'd use the CTreeCursor class as it has two members:
    HTREEITEM m_hTreeItem;
    CTreeCtrlEx *m_pTree;
But this would work with
call( ctrl& a, ctrl& b, HTREEITEM a, HTREEITEM, b )
I'd write it to copy any tree object to any other tree object.
It means you can copy parts of a tree even to the same tree
Note that image lists are handled elsewhere if different trees.
It copies below the from and to, so roots can be used.
*/
void CopyTreeItems( CTreeCursor from, CTreeCursor to )
{
    //Assert that the to is not a child of the from
    //That could get messy

    //As if recursive, so use a stack
    std::stack< CTreeCursor > stack;

    for( CTreeCursor at= from.GetChild( ); ! stack.empty( ); )
    {
        if( ! at.IsValid( ) )
        {
            if( stack.size( ) )
            {
                at= stack.top( );
                stack.pop( );
                to= to.GetParent( );
            }
            continue;
        }
        //create/copy item
        to.AddTail( at.GetText( ), at.GetImageID( ), at.GetImageIDSel( ) );
        to.SetData( at.GetData( ) );

        if( at.HasChildren( ) )
        {
            stack.push( at.GetNextSibling( ) );
            at= at.GetChild( );
            to= to.GetChild( );
        }
        else
        {
            at= at.GetNextSibling( );
        }
    }
}
//end post

Best, Dan.