CMDIChild

Win32++

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CMDIChild Class

Description

This class provides a child window for MDI (Multi Document Interface) applications. MDI applications are capable of hosting several child windows within a frame.

The CMDIChild class inherits much of its default implementation from CWnd, and adds the additional functionality required for MDI applications.

CMDIChild Members

CMDIChild

CMDIChild();

Constructor for CMDIChild.

GetMDIFrame

CMDIFrame* GetMDIFrame() const;

Returns a pointer to the MDI Frame. GetView

virtual CWnd* GetView() const {return m_pView;}

Returns a pointer to the MDI Child's view window.

MDIActivate

void MDIActivate() const;

Activates this MDI child. MDIDestroy

void MDIDestroy() const;

Destroys this MDI child. MDIMaximize

void MDIMaximize() const;

Maximizes this MDI Child. MDIRestore

void MDIRestore() const;

Restores this MDI child from a maximized or minimized state. RecalcLayout

virtual void RecalcLayout();

Repositions the view window when the MDI child is restored. SetChildMenu

virtual void SetChildMenu(LPCTSTR MenuName);

Sets the MDI child menu, given its Resource ID. SetHandles

void SetHandles(HMENU MenuName, HACCEL AccelName);

Sets the MDI child's menu and accelerator table. SetView

virtual void SetView(CWnd& pwndView);

Sets the view window for the MDI child.

Overridables

Create	virtual HWND Create(HWND hWndParent = NULL); Creates the MDI child window.
OnClose	virtual void OnClose(); Called when the MDI child window is about to be closed. Override this to prevent the MDI child window from being closed.
OnCreate	virtual void OnCreate(); Called when the MDI child window is created.
OnMDIActivate	virtual LRESULT OnMDIActivate(WPARAM wParam, LPARAM lParam); Called when the MDI child window is activated.
OnWindowPosChanged	virtual LRESULT OnWindowPosChanged(WPARAM wParam, LPARAM lParam); Called when the MDI child window is moved.

Base class Members

For base class members, refer to the members of CWnd.

Remarks

Setting the MDI Child's View window and Menu

Each type of MDI child will have a view window and will usually have a unique menu. The menu which is displayed in the MDI frame will belong the the MDI child that has keyboard focus, or the MDI frame's menu if no MDI child is active. The SetView function sets the view window, and the SetChildMenu seta the menu of a MDI child, as follows.

CSimpleMDIChild::CSimpleMDIChild()
{
  // Set m_View as the view window of the MDI child
  SetView(m_View);
	
  // Set the menu for this MDI child
  SetChildMenu(_T("MdiMenuView"));
}

The MDI child's menu would be defined in the resource script file (usually Resource.rc) as follows.

MDIMENU MENU
BEGIN
    POPUP "&File"
    BEGIN
        MENUITEM "New &View\tCtrl+N",           IDM_FILE_NEW
        MENUITEM "&Close",                      IDM_FILE_CLOSE
        MENUITEM SEPARATOR
        MENUITEM "E&xit",                       IDM_FILE_EXIT
    END
    POPUP "&View"
    BEGIN
        MENUITEM "&Tool Bar",                   IDW_VIEW_TOOLBAR, CHECKED
        MENUITEM "&Status Bar",                 IDW_VIEW_STATUSBAR, CHECKED
    END
    POPUP "&Window"
    BEGIN
        MENUITEM "&Cascade\tShift+F5",          IDW_WINDOW_CASCADE
        MENUITEM "&Tile\tShift+F4",             IDW_WINDOW_TILE
        MENUITEM "Arrange &Icons",              IDW_WINDOW_ARRANGE
        MENUITEM "Close &All",                  IDW_WINDOW_CLOSEALL
    END
    POPUP "&Help"
    BEGIN
        MENUITEM "&About",                      IDM_HELP_ABOUT
    END
END

Setting the MDI Child's Title and Icon

Each type of MDI child usually has an icon. The MDI child's icon and title are is set as follows.

void CMDIChildView::OnInitialUpdate()
{
  ::SetWindowText(m_hWnd, _T("MDI Child Window"));
  SetIconLarge(IDI_VIEW);
  SetIconSmall(IDI_VIEW);
}

Refer to the MDI Frames section for information on how to use CMDIChild with CMDIFrame.

Summary Information

Header file	mdi.h
Win32/64 support	Yes
WinCE support	No

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