Could use some help with this interface

I have been working with a MDI 3-way child splitter that works pretty well - but I cannot figure out how to precisely control the split windows.

The basic idea is to split each child window as shown below.

IOW, I want A and B to be split equally, and I want to be able to toggle (show/hide) C.

My problem is that in order to get the initial split that I want with each new child, I have used CChildFrm::OnSize to set up the split sizes such that every resize or new child or update reproduces the original split, making it impossible for the user to hide C as it keeps reappearing. While admittedly this is largely an aesthetic issue, it has bothered me for months, so I thought I would ask you all for help.

A sample demonstrating the problem is attached.

Thanks for any help you might provide.

You are losing state in the OnSize function because you don't handle the view 3 window state there.

You can clean this up a bit, but here it is quick and dirty:

Code:

---

void CChildFrame::OnSize(UINT nType, int cx, int cy)
{
        CMDIChildWndEx::OnSize(nType, cx, cy);

        CRect cr;
        GetWindowRect(&cr);

        if (m_bInitSplitter && nType != SIZE_MINIMIZED)
        {
                //m_wndSplitter.SetRowInfo( 0, cy, 0 );
                m_wndSplitter.SetRowInfo( 0, 0.75*cy, 0 );  // adjust row 1 height here
                //m_wndSplitter.SetColumnInfo(0, cr.Width()*0.25 / 2, 50);
                //m_wndSplitter.SetColumnInfo(1, cr.Width()*0.75 / 2, 50);
                m_wndSplitter2.SetColumnInfo(0, cr.Width() / 2, 50);
                m_wndSplitter2.SetColumnInfo(1, cr.Width()/ 2, 50);
                m_wndSplitter.SetColumnInfo(0, cr.Width(), 50);
                m_wndSplitter.SetRowInfo(1, cr.Height()/4, 30);

                m_wndSplitter.RecalcLayout();
        }

        DisplayViewThreeWindow();
}

void CChildFrame::DisplayViewThreeWindow()
{
        // get the debug view text
        CString csViewThreeText;
        //CChildFrame * pChildFrm = (CChildFrame*)GetActiveFrame();
        //CSplitterWnd * pWndSplitter = pChildFrm->GetWndSplitter();
        //pWndSplitter->GetPane(1, 0)->GetWindowText(csDebugText);
        TRACE0("csViewThreeText = "); OutputDebugString(csViewThreeText); TRACE0("\n");
//        MessageBox(csDebugText);
        //CSplitterWnd * pWndSplitter2 = pChildFrm->GetWndSplitter2();

        int cx, cy;
        CRect r;
        GetClientRect(&r);

        if(!m_bViewThree)
        {
                //pWndSplitter->EnableWindow();
                //pWndSplitter->SetRowInfo(0, r.Height(), r.Height());
                //pWndSplitter->SetColumnInfo(0,r.Width()/2,0);
                //pWndSplitter->SetColumnInfo(0,r.Width()/2,0);
                m_wndSplitter.EnableWindow();
                m_wndSplitter.SetRowInfo(0, r.Height(), r.Height());
                m_wndSplitter.SetColumnInfo(0,r.Width()/2,0);
                m_wndSplitter.SetColumnInfo(0,r.Width()/2,0);
        }

        if(m_bViewThree)
        {
                m_wndSplitter.EnableWindow();
                cx = r.Width();
                cy = 0.70 * r.Height();
                m_wndSplitter.EnableWindow();
                m_wndSplitter.SetRowInfo(0,cy,30);
                m_wndSplitter.SetColumnInfo(0,cx,30);
        }

        m_wndSplitter.RecalcLayout();

}

void CChildFrame::OnViewThreeWindow()
{
        m_bViewThree = !m_bViewThree;

        DisplayViewThreeWindow();
}

---

Thanks alot Arjay,

This works after making some minor changes. It is somewhat confusing which panes belong to which CSplitterWnd because there is only 1 column with 2 rows and the upper right hand pane is nested within column 1 which is misleadingly associated with m_wndSplitter2 while row 2 is associated with m_wndSplitter.

CSplitterWnd m_wndSplitter; // the bottom pane (1, 0)
CSplitterWnd m_wndSplitter2; // the top left hand pane (0, 0) and the top right hand pane (0, 1)

Code:

---

void CChildFrame::OnSize(UINT nType, int cx, int cy)
{
        CMDIChildWndEx::OnSize(nType, cx, cy);

        CRect cr;
        GetWindowRect(&cr);

        if (m_bInitSplitter && nType != SIZE_MINIMIZED)
        {
                m_wndSplitter.SetRowInfo( 0, 0.75*cy, 0 );  // adjust row 1 height here
                m_wndSplitter2.SetColumnInfo(0, cr.Width() / 2, 50);
                m_wndSplitter2.SetColumnInfo(1, cr.Width()/ 2, 50);
                m_wndSplitter.SetColumnInfo(0, cr.Width(), 50);
                m_wndSplitter.SetRowInfo(1, cr.Height()/4, 30);

                m_wndSplitter.RecalcLayout();

                DisplayViewThreeWindow();
        }

        //DisplayViewThreeWindow();  // crashes if here
}

void CChildFrame::DisplayViewThreeWindow()
{
        // get the debug view text
        CString csViewThreeText;
        TRACE0("csViewThreeText = "); OutputDebugString(csViewThreeText); TRACE0("\n");

        int cx, cy;
        CRect r;
        GetClientRect(&r);

        if(!m_bViewThree)
        {
                m_wndSplitter2.EnableWindow();
                m_wndSplitter2.SetRowInfo(0, r.Height(), r.Height());
                m_wndSplitter2.SetColumnInfo(0,r.Width()/2,0);
                m_wndSplitter2.SetColumnInfo(1,r.Width()/2,0);

                cx = r.Width();
                cy = r.Height();
                m_wndSplitter.EnableWindow();
                m_wndSplitter.SetRowInfo(0,cy,30);
                m_wndSplitter.SetColumnInfo(0,cx,30);

        }

        if(m_bViewThree)
        {
                m_wndSplitter.EnableWindow();
                cx = r.Width();
                cy = 0.70 * r.Height();
                m_wndSplitter.EnableWindow();
                m_wndSplitter.SetRowInfo(0,cy,30);
                m_wndSplitter.SetColumnInfo(0,cx,30);
        }

        m_wndSplitter.RecalcLayout();

}

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Great. The problem was simply that the OnSize() method didn't take the bVieewThree state into account.