While CDockablePane does not move remaining elements in a MainFrame to right ?

progman99

I have created "empty" MFC application (C++, Visual Studio, type - MDI, style = MFC Standard). In original it simply creates empty documents.
Then I have added CDockablePane with a tree (CMainFrame::mmm_wndTreeView).
I have expected the CDockablePane will be placed at left side and documents (see tabs in screenshot) - at right.
In fact the CDockablePane with the tree has appeared not at left side - it overrides documents areas. See "before_dragging.png".
If I drag the CDockablePane then I can get it left and documents at right. See "after_dragging.png".

The question is: how can I place CDockablePane at left side moving documents window (with tabs) to the right at start of my program (as in "after_dragging" screenshot)?

Initialization of main frame:

// ----------------- MainFrm.h: CMainFrame class -----------------
//
#include "TestMFC_MyTreeView.h"     // MyTreeView
 
#pragma once
 
class CMainFrame : public CMDIFrameWndEx
{
    DECLARE_DYNAMIC(CMainFrame)
public:
    CMainFrame() noexcept;
 
public:
 
public:
 
public:
    virtual BOOL PreCreateWindow(CREATESTRUCT& cs);
 

public:
    virtual ~CMainFrame();
#ifdef _DEBUG
    virtual void AssertValid() const;
    virtual void Dump(CDumpContext& dc) const;
#endif
 
protected:  
    CToolBar          m_wndToolBar;
    CStatusBar        m_wndStatusBar;
    // it's my tree
    MyTreeView          mmm_wndTreeView;
 
protected:
    afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);
    DECLARE_MESSAGE_MAP()
 
};
 
 
 
 
// --------------------- MainFrm_Empty.cpp: implementation of CMainFrame -------------------
//
 
#include "pch.h"
#include "framework.h"
#include "TestMFC_Empty.h"
 
#include "MainFrm_Empty.h"
 
#ifdef _DEBUG
#define new DEBUG_NEW
#endif
 
// CMainFrame
 
IMPLEMENT_DYNAMIC(CMainFrame, CMDIFrameWndEx)
 
BEGIN_MESSAGE_MAP(CMainFrame, CMDIFrameWndEx)
    ON_WM_CREATE()
END_MESSAGE_MAP()
 
static UINT indicators[] =
{
    ID_SEPARATOR,           
    ID_INDICATOR_CAPS,
    ID_INDICATOR_NUM,
    ID_INDICATOR_SCRL,
};
 
 
CMainFrame::CMainFrame() noexcept
{
}
 
CMainFrame::~CMainFrame()
{
}
 
int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
    if (CMDIFrameWndEx::OnCreate(lpCreateStruct) == -1)
        return -1;
 
    CDockingManager::SetDockingMode(DT_SMART);
    EnableAutoHidePanes(CBRS_ALIGN_ANY);
 
    CMDITabInfo mdiTabParams;
    mdiTabParams.m_style = CMFCTabCtrl::STYLE_3D_ONENOTE; 
    mdiTabParams.m_bActiveTabCloseButton = TRUE;      
    mdiTabParams.m_bTabIcons = FALSE;    
    mdiTabParams.m_bAutoColor = TRUE;    
    mdiTabParams.m_bDocumentMenu = TRUE; 
    EnableMDITabbedGroups(TRUE, mdiTabParams);
 
    if (!m_wndToolBar.CreateEx(this, TBSTYLE_FLAT, WS_CHILD | WS_VISIBLE | CBRS_TOP | CBRS_GRIPPER | CBRS_TOOLTIPS | CBRS_FLYBY | CBRS_SIZE_DYNAMIC) ||
        !m_wndToolBar.LoadToolBar(IDR_MAINFRAME))
    {
        TRACE0("Error1\n");
        return -1;      
    }
 
    if (!m_wndStatusBar.Create(this))
    {
        TRACE0("Error2\n");
        return -1;      
    }
    m_wndStatusBar.SetIndicators(indicators, sizeof(indicators)/sizeof(UINT));
 

    // @+++++++++++++++ code to display the tree +++++++++++++++++++++++++
    CString strTreeClassView = _T("TreeWinName");
 
    if (!mmm_wndTreeView.Create(strTreeClassView, this, CRect(0, 0, 200, 200), TRUE, ID_VIEW_MYTREEVIEW, WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS | WS_CLIPCHILDREN | CBRS_LEFT | CBRS_FLOAT_MULTI))
    {
        TRACE0("Error3\n");
        return FALSE; 
    }
 
    mmm_wndTreeView.EnableDocking(CBRS_ALIGN_ANY);

    DockPane(&mmm_wndTreeView, AFX_IDW_DOCKBAR_LEFT); 
 
    ModifyStyle(0, FWS_PREFIXTITLE);
 
    return 0;
}
 
BOOL CMainFrame::PreCreateWindow(CREATESTRUCT& cs)
{
    if( !CMDIFrameWndEx::PreCreateWindow(cs) )
        return FALSE;
 
    return TRUE;
}

jeron1

Perhaps something useful in the following article?
https://www.codeproject.com/articles/Understanding-CDockablePane

progman99

jeron1, thank you, but I have started with that acticle :)
It was useful but didn't helped me.