Stretching a CTreeCtrl

Daniel W. Levi -- DLevi@hworks.com
Tuesday, March 11, 1997

Environment: VC++ 4.2b, NT 4.0

I've got a CFormView-derived class with one control, derived from
CTreeCtrl.  I'm looking for behaviour similar to the SQL-Enterpriser
Manager.

I over-rode the View OnSize() to resize tree control so it occupies the
whole view window.  This is making the tree control redraw itself very
strangely: (1) the scrollbars are not draw consistently; (2) when the
scrollbars do draw, sometimes the scrolling is Very Slow;  (3) sometimes
gray shows around the tree control.

Does anyone know the correct method for stretching a control to fill a
FormView?

Thanks

Dan Levi
dlevi@hworks.com

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Daniel W. Levi -- DLevi@hworks.com
Thursday, March 20, 1997

Several days ago i wrote: 

>I 've got a CFormView-derived class with one control, derived from
> CTreeCtrl.  I'm looking for behaviour similar to the SQL-Enterpriser
> Manager.
>
> I over-rode the View OnSize() to resize tree control so it occupies the
> whole view window.  This is making the tree control redraw itself very
> strangely: (1) the scrollbars are not draw consistently; (2) when the
> scrollbars do draw, sometimes the scrolling is Very Slow;  (3) sometimes
> gray shows around the tree control.
>
> Does anyone know the correct method for stretching a control to fill a
> FormView?

One solution (thanks go to Peter Moravek) was to rewrite my view class,
deriving from CView instead of CFormView. Another was, in my override if
OnSize(), to call CView::OnSize() instead of CFormView::OnSize().

The code is

void CCEMView::OnSize(UINT nType, int cx, int cy) 
{
	// use CView::OnSize, CFormView::OnSize causes scroll bar wierdness
	CView::OnSize(nType, cx, cy);
	ResizeTreeCtrl();
}

void CCEMView::ResizeTreeCtrl()
{
	if (m_tree.m_hWnd != NULL)
	{
		CRect rCFormView;
		GetClientRect( &rCFormView );	// Get view's client rect
		m_tree.SetWindowPos( this,
			rCFormView.left, rCFormView.top, rCFormView.right, rCFormView.bottom,
			SWP_NOZORDER | SWP_SHOWWINDOW
			);
	}
}

Thanks to all those who commented and proposed solutions.

Dan Levi
dlevi@hworks.com

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