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CMDIChildWndEx Class

  • Cikk

The CMDIChildWndEx class provides the functionality of a Windows multiple document interface (MDI) child window. It extends the functionality of CMDIChildWnd Class. The framework requires this class when an MDI application uses certain MFC classes.

For more detail see the source code located in the VC\atlmfc\src\mfc folder of your Visual Studio installation.

Syntax

class CMDIChildWndEx : public CMDIChildWnd

Members

Public Methods

Name Description
CMDIChildWndEx::ActivateTopLevelFrame Called internally by the framework to activate top level frame when the application should be activated from a taskbar tab.
CMDIChildWndEx::AddDockSite This method is not used or implemented.
CMDIChildWndEx::AddPane Adds a pane.
CMDIChildWndEx::AddTabbedPane Adds a tabbed pane.
CMDIChildWndEx::AdjustDockingLayout Adjusts the docking layout.
CMDIChildWndEx::CanShowOnMDITabs
CMDIChildWndEx::CanShowOnTaskBarTabs Tells the framework whether this MDI child can be displayed on Windows 7 taskbar tabs.
CMDIChildWndEx::CanShowOnWindowsList Returns TRUE if the MDI child window name can be displayed in the CMFCWindowsManagerDialog Class dialog box. Otherwise returns FALSE.
CMDIChildWndEx::CreateObject Called by the framework to create a dynamic instance of this class type.
CMDIChildWndEx::DockPane Docks a pane.
CMDIChildWndEx::DockPaneLeftOf Docks one pane to the left of another pane.
CMDIChildWndEx::EnableAutoHidePanes Enables auto-hide mode for panes when they are docked at the specified sides of the window.
CMDIChildWndEx::EnableDocking Enables docking of the child window to the main frame.
CMDIChildWndEx::EnableTaskbarThumbnailClipRect Enables or disables automatic selection of a portion of a window's client area to display as that window's thumbnail in the taskbar.
CMDIChildWndEx::GetDockingManager
CMDIChildWndEx::GetDocumentName Returns the name of the document that is displayed in the MDI child window.
CMDIChildWndEx::GetFrameIcon Called by the framework to retrieve the MDI child window icon.
CMDIChildWndEx::GetFrameText Called by the framework to retrieve the text for the MDI child window.
CMDIChildWndEx::GetPane Finds a pane by the specified control ID.
CMDIChildWndEx::GetRelatedTabGroup
CMDIChildWndEx::GetTabbedPane Returns a pointer to an embedded docking pane that was converted to a tabbed document.
CMDIChildWndEx::GetTabProxyWnd Returns tab proxy window actually registered with Windows 7 taskbar tabs.
CMDIChildWndEx::GetTaskbarPreviewWnd Called by the framework when it needs to obtain a child window (usually a view or splitter window) to be displayed on Windows 7 taskbar tab thumbnail.
CMDIChildWndEx::GetTaskbarThumbnailClipRect Called by the framework when it needs to select a portion of a window's client area to display as that window's thumbnail in the taskbar.
CMDIChildWndEx::GetThisClass Called by the framework to obtain a pointer to the CRuntimeClass object that is associated with this class type.
CMDIChildWndEx::GetToolbarButtonToolTipText Called by the framework to retrieve a tooltip for a toolbar button.
CMDIChildWndEx::InsertPane Registers the specified pane with the docking manager.
CMDIChildWndEx::InvalidateIconicBitmaps Invalidates iconic bitmap representation of MDI child.
CMDIChildWndEx::IsPointNearDockSite Determines whether a specified point is near the dock site.
CMDIChildWndEx::IsReadOnly Returns TRUE if the document that is displayed in the child window is read-only. Otherwise returns FALSE.
CMDIChildWndEx::IsRegisteredWithTaskbarTabs Returns TRUE if MDI child was successfully registered with Windows 7 taskbar tabs.
CMDIChildWndEx::IsTabbedPane Returns TRUE if the MDI child window contains a docking pane. Otherwise returns FALSE.
CMDIChildWndEx::IsTaskbarTabsSupportEnabled Tells whether the MDI child can appear on Windows 7 taskbar tabs.
CMDIChildWndEx::IsTaskbarThumbnailClipRectEnabled Tells whether automatic selection of a portion of a window's client area to display as that window's thumbnail in the taskbar is enabled or disabled.
CMDIChildWndEx::m_dwDefaultTaskbarTabPropertyFlags A combination of flags, which is passed by the framework to the SetTaskbarTabProperties method, when a tab (MDI child) is being registered with Windows 7 taskbar tabs. The default combination is STPF_USEAPPTHUMBNAILWHENACTIVE | STPF_USEAPPPEEKWHENACTIVE.
CMDIChildWndEx::OnGetIconicLivePreviewBitmap Called by the framework when it needs to obtain a bitmap for live preview of MDI child.
CMDIChildWndEx::OnGetIconicThumbnail Called by the framework when it needs to obtain a bitmap for iconic thumbnail of MDI child.
CMDIChildWndEx::OnMoveMiniFrame Called by the framework to move a mini-frame window.
CMDIChildWndEx::OnPressTaskbarThmbnailCloseButton Called by the framework when the user presses close button on Taskbar tab thumbnail..
CMDIChildWndEx::OnSetPreviewMode Called by the framework to enter or exit print preview mode.
CMDIChildWndEx::OnTaskbarTabThumbnailActivate Called by the framework when the Taskbar tab thumbnail should process WM_ACTIVATE message.
CMDIChildWndEx::OnTaskbarTabThumbnailMouseActivate Called by the framework when the Taskbar tab thumbnail should process WM_MOUSEACTIVATE message.
CMDIChildWndEx::OnTaskbarTabThumbnailStretch Called by the framework when it needs to stretch a bitmap for Windows 7 taskbar tab thumbnail preview of MDI child.
CMDIChildWndEx::OnUpdateFrameTitle Called by the framework to update the frame title. (Overrides CMDIChildWnd::OnUpdateFrameTitle.)
CMDIChildWndEx::PaneFromPoint Returns the pane that contains the given point.
CMDIChildWndEx::PreTranslateMessage Used by class CWinApp to translate window messages before they are dispatched to the TranslateMessage and DispatchMessage Windows functions. (Overrides CWnd::PreTranslateMessage.)
CMDIChildWndEx::RecalcLayout Recalculates the layout of the window.
CMDIChildWndEx::RegisterTaskbarTab Registers MDI child with Windows 7 taskbar tabs.
CMDIChildWndEx::RemovePaneFromDockManager Removes a pane from the docking manager.
CMDIChildWndEx::SetRelatedTabGroup
CMDIChildWndEx::SetTaskbarTabActive Activates corresponding Windows 7 taskbar tab.
CMDIChildWndEx::SetTaskbarTabOrder Inserts MDI child before specified window on Windows 7 taskbar tabs.
CMDIChildWndEx::SetTaskbarTabProperties Sets properties for a Windows 7 taskbar tab.
CMDIChildWndEx::SetTaskbarThumbnailClipRect Called internally by the framework to set clipping rectangle to select a portion of a window's client area to display as that window's thumbnail in the taskbar.
CMDIChildWndEx::ShowPane
CMDIChildWndEx::UnregisterTaskbarTab Removes MDI child from Windows 7 taskbar tabs.
CMDIChildWndEx::UpdateTaskbarTabIcon Updates Windows 7 taskbar tab icon.

Remarks

To take advantage of extended docking features in MDI applications, derive the MDI child window class of your application from CMDIChildWndEx instead of CMDIChildWnd.

Example

The following example derives a class from CMDIChildWndEx. This code snippet comes from the VisualStudioDemo Sample: MFC Visual Studio Application.

class CChildFrame : public CMDIChildWndEx
{
   DECLARE_DYNCREATE(CChildFrame)
public:
   CChildFrame();

   // Overrides
public:
   virtual BOOL PreCreateWindow(CREATESTRUCT &cs);
   virtual void ActivateFrame(int nCmdShow = -1);

   virtual BOOL IsReadOnly();
   virtual LPCTSTR GetDocumentName(CObject **pObj);

   // Implementation
public:
   virtual ~CChildFrame();
#ifdef _DEBUG
   virtual void AssertValid() const;
   virtual void Dump(CDumpContext &dc) const;
#endif

protected:
   afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);

   DECLARE_MESSAGE_MAP()
};

Inheritance Hierarchy

CObject

CCmdTarget

CWnd

CFrameWnd

CMDIChildWnd

CMDIChildWndEx

Requirements

Header: afxMDIChildWndEx.h

CMDIChildWndEx::AddPane

Adds a pane.

BOOL AddPane(
    CBasePane* pControlBar,
    BOOL bTail = TRUE);

Parameters

pControlBar
[in] A pointer to the pane.

bTail
[in] TRUE to add the pane to the end of the list of panes for the docking manager; otherwise, FALSE.

Return Value

TRUE if the pane was successfully registered with the docking manager; otherwise, FALSE.

CMDIChildWndEx::AddTabbedPane

Adds a tabbed pane.

void AddTabbedPane(CDockablePane* pControlBar);

Parameters

pControlBar
[in] A pointer to the pane.

CMDIChildWndEx::AdjustDockingLayout

Adjusts the docking layout.

virtual void AdjustDockingLayout(HDWP hdwp = NULL);

Parameters

hdwp
[in] Handle to a deferred window position structure.

CMDIChildWndEx::CanShowOnMDITabs

virtual BOOL CanShowOnMDITabs();

Return Value

Remarks

CMDIChildWndEx::CanShowOnWindowsList

Specifies whether the MDI child window name can be displayed in the CMFCWindowsManagerDialog Class dialog box.

virtual BOOL CanShowOnWindowsList();

Return Value

TRUE if the window can be displayed in the Windows dialog box; otherwise, FALSE.

Remarks

Override this method in a derived class and return FALSE if the window should not be displayed in the Windows dialog box. This function is called from CMFCWindowsManagerDialog.

CMDIChildWndEx::DockPane

Docks a pane.

void DockPane(
    CBasePane* pBar,
    UINT nDockBarID = 0,
    LPCRECT lpRect = NULL);

Parameters

pBar
[in] A pointer to the pane.

nDockBarID
[in] The ID of the pane.

lpRect
[in] A pointer to a rectangle.

Remarks

The lpRect parameter is not used.

CMDIChildWndEx::DockPaneLeftOf

Docks one pane to the left of another pane.

BOOL DockPaneLeftOf(
    CPane* pBar,
    CPane* pLeftOf);

Parameters

pBar
A pointer to the pane that is to be docked.

pLeftOf
A pointer to the pane that serves as the point of reference.

Return Value

TRUE on success, FALSE on failure.

Remarks

This method takes the pane specified by pBar and docks it at the left side of the pane specified by pLeftOf.

Call this method when you want to dock several panes in predefined order.

CMDIChildWndEx::EnableAutoHidePanes

Enables auto-hide mode for panes when they are docked at the specified sides of the window.

BOOL EnableAutoHidePanes(DWORD dwDockStyle);

Parameters

dwDockStyle
[in] Specifies the sides of the main frame window that is enabled. Use one or more of the following flags.

  • CBRS_ALIGN_LEFT

  • CBRS_ALIGN_RIGHT

  • CBRS_ALIGN_TOP

  • CBRS_ALIGN_BOTTOM

Return Value

TRUE if the method succeeds; otherwise FALSE.

CMDIChildWndEx::EnableDocking

Enables docking of the child window to the main frame.

BOOL EnableDocking(DWORD dwDockStyle);

Parameters

dwDockStyle
[in] Specifies the docking alignment to enable.

Return Value

TRUE if the method succeeds; otherwise FALSE.

Remarks

Call this method to enable docking alignment to the main frame. You can pass a combination of CBRS_ALIGN_ flags (for more information, see CControlBar::EnableDocking).

CMDIChildWndEx::GetDockingManager

CDockingManager* GetDockingManager();

Return Value

Remarks

CMDIChildWndEx::GetDocumentName

Returns the name of the document that is displayed in the MDI child window.

virtual LPCTSTR GetDocumentName(CObject** pObj);

Return Value

A pointer to a string that contains the name of a document.

Remarks

A document is what the MDI child window displays. Generally, the window displays data that is loaded from or saved to a file. Therefore, the name of the document is the name of the file. The default implementation of GetDocumentName returns a string obtained from CDocument::GetPathName.

If the window displays a document that is not loaded from a file, override this method in a derived class and return a unique document identifier.

GetDocumentName is called by the framework when it saves the state of all opened documents. The returned string is written to the registry.

When the framework is restoring state later, the document name is read from the registry and passed to CMDIFrameWndEx::CreateDocumentWindow. Override this method in a CMDIFrameWndEx-derived class and create or open a document that has this name and read in the file that has this name. If the document is not based on a file, create the document based on the document identifier itself. You should do the preceding actions only if you intend to save and restore documents.

Example

The following example demonstrates the use of the GetDocumentName method. This code snippet comes from the VisualStudioDemo Sample: MFC Visual Studio Application.

LPCTSTR CChildFrame::GetDocumentName(CObject **pObj)
{
   if (DYNAMIC_DOWNCAST(CStartView, GetActiveView()) != NULL)
   {
      return g_strStartViewName;
   }
   return CMDIChildWndEx::GetDocumentName(pObj);
}

CMDIChildWndEx::GetFrameIcon

Called by the framework to retrieve the icon of the MDI child window.

virtual HICON GetFrameIcon() const;

Return Value

A handle to the window icon.

Remarks

This method is called by the framework to determine what icon to display on the MDI tab that contains the MDI child frame window.

By default this method returns the window icon. Override GetFrameIcon in a CMDIChildWndEx-derived class to customize this behavior.

CMDIChildWndEx::GetFrameText

Called by the framework to retrieve the text for the MDI child window.

virtual CString GetFrameText() const;

Return Value

A string that contains the frame window text.

Remarks

This method is called by the framework to determine what text to display on the MDI tab that contains the MDI child frame window.

By default this method returns the window text. Override GetFrameText in a CMDIChildWndEx-derived class to customize this behavior.

CMDIChildWndEx::GetPane

Finds a pane by the specified control ID.

CBasePane* GetPane(UINT nID);

Parameters

nID
[in] The control ID of the pane to find.

Return Value

A pointer to the pane if found, otherwise NULL.

CMDIChildWndEx::GetRelatedTabGroup

CMFCTabCtrl* GetRelatedTabGroup();

Return Value

Remarks

CMDIChildWndEx::GetTabbedPane

Returns a pointer to a docking pane that is part of a group of MDI tabbed documents.

CDockablePane* GetTabbedPane() const;

Return Value

A pointer to a docking pane that is part of a group of MDI tabbed documents.

CMDIChildWndEx::GetToolbarButtonToolTipText

Called by the framework to retrieve a tooltip for a toolbar button.

virtual BOOL GetToolbarButtonToolTipText(
    CMFCToolBarButton*,
    CString&);

Return Value

TRUE if the tooltip has been displayed. The default implementation returns FALSE.

Remarks

Override this method if you want to display custom tool tips for toolbar buttons.

CMDIChildWndEx::InsertPane

Registers the specified pane with the docking manager.

BOOL InsertPane(
    CBasePane* pControlBar,
    CBasePane* pTarget,
    BOOL bAfter = TRUE);

Parameters

pControlBar
[in] A pointer to the pane to insert.

pTarget
[in] A pointer to the adjacent pane.

bAfter
[in] If TRUE, pControlBar is inserted after pTarget. If FALSE, pControlBar is inserted before pTarget.

Return Value

TRUE if the method succeeds, FALSE otherwise.

CMDIChildWndEx::IsPointNearDockSite

Determines whether a specified point is near the dock site.

BOOL IsPointNearDockSite(
    CPoint point,
    DWORD& dwBarAlignment,
    BOOL& bOuterEdge) const;

Parameters

point
[in] The specified point.

dwBarAlignment
[in] Specifies which edge the point is near. Possible values are CBRS_ALIGN_LEFT, CBRS_ALIGN_RIGHT, CBRS_ALIGN_TOP, and CBRS_ALIGN_BOTTOM

bOuterEdge
[in] TRUE if the point is near the outer border of the dock site; FALSE otherwise.

Return Value

TRUE if the point is near the dock site; otherwise FALSE.

Remarks

The point is near the dock site when it is within the sensitivity set in the docking manager. The default sensitivity is 15 pixels.

CMDIChildWndEx::IsReadOnly

Specifies whether the document that is displayed in the child window is read-only.

virtual BOOL IsReadOnly();

Return Value

TRUE if the document is read-only; otherwise FALSE.

Remarks

This function is used to prevent saving of read-only documents.

Example

The following example demonstrates overriding the IsReadOnly method. This code snippet comes from the VisualStudioDemo Sample: MFC Visual Studio Application.

BOOL CChildFrame::IsReadOnly()
{
   return DYNAMIC_DOWNCAST(CStartView, GetActiveView()) != NULL;
}

CMDIChildWndEx::IsTabbedPane

Specifies whether the MDI child window contains a docking pane.

BOOL IsTabbedPane() const;

Return Value

TRUE if the MDI child window contains a docking pane that was converted to a tabbed document; otherwise FALSE.

CMDIChildWndEx::OnMoveMiniFrame

Called by the framework to move a mini-frame window.

virtual BOOL OnMoveMiniFrame(CWnd* pFrame);

Parameters

pFrame
[in] A pointer to a mini-frame window.

Return Value

TRUE if the method succeeds, otherwise FALSE.

CMDIChildWndEx::OnSetPreviewMode

Called by the framework to enter or exit print preview mode.

virtual void OnSetPreviewMode(
    BOOL bPreview,
    CPrintPreviewState* pState);

Parameters

bPreview
[in] If TRUE, enter print preview mode. If FALSE, exit print preview mode.

pState
[in] A pointer to the print preview state structure.

CMDIChildWndEx::OnUpdateFrameTitle

Called by the framework to update the frame title.

virtual void OnUpdateFrameTitle(BOOL bAddToTitle);

Parameters

bAddToTitle
[in] If TRUE, add the document name to the title.

CMDIChildWndEx::PaneFromPoint

Returns the pane that contains the given point.

CBasePane* PaneFromPoint(
    CPoint point,
    int nSensitivity,
    bool bExactBar,
    CRuntimeClass* pRTCBarType) const;

CBasePane* PaneFromPoint(
    CPoint point,
    int nSensitivity,
    DWORD& dwAlignment,
    CRuntimeClass* pRTCBarType) const;

Parameters

point
[in] Specifies the point, in screen coordinates, to check.

nSensitivity
[in] Increase the search area by this amount. A pane satisfies the search criteria if the given point falls in the increased area.

bExactBar
[in] TRUE to ignore the nSensitivity parameter; otherwise, FALSE.

pRTCBarType
[in] If not NULL, the method searches only panes of the specified type.

dwAlignment
[in] If a pane is found at the specified point, this parameter contains the side of the pane that was closest to the specified point. For more information, see the Remarks section.

Return Value

A pointer to the CBasePane-derived object that contains the given point, or NULL if no pane was found.

Remarks

Call this method to determine whether a pane contains the specified point according to the specified conditions such as runtime class and visibility.

When the function returns and a pane was found, dwAlignment contains the alignment of the specified point. For example, if the point was closest to the top of the pane, dwAlignment is set to CBRS_ALIGN_TOP.

CMDIChildWndEx::RecalcLayout

Recalculates the layout of the window.

virtual void RecalcLayout(BOOL bNotify = TRUE);

Parameters

bNotify
[in] If TRUE, the active in-place item for the window receives notification of the layout change.

CMDIChildWndEx::RemovePaneFromDockManager

Removes a pane from the docking manager.

void RemovePaneFromDockManager(
    CBasePane* pControlBar,
    BOOL bDestroy,
    BOOL bAdjustLayout,
    BOOL bAutoHide,
    CBasePane* pBarReplacement);

Parameters

pControlBar
[in] A pointer to the pane to remove.

bDestroy
[in] If TRUE, the removed pane is destroyed.

bAdjustLayout
[in] If TRUE, adjust the docking layout immediately.

bAutoHide
[in] If TRUE, the docking layout is related to the list of autohide bars. If FALSE, the docking layout is related to the list of regular panes.

pBarReplacement
[in] A pointer to a pane that replaces the removed pane.

CMDIChildWndEx::SetRelatedTabGroup

void SetRelatedTabGroup(CMFCTabCtrl* p);

Parameters

[in] p

Remarks

CMDIChildWndEx::ShowPane

void ShowPane(
    CBasePane* pBar,
    BOOL bShow,
    BOOL bDelay,
    BOOL bActivate);

Parameters

[in] pBar

[in] bShow

[in] bDelay

[in] bActivate

Remarks

CMDIChildWndEx::UpdateTaskbarTabIcon

Updates the Windows 7 taskbar tab icon.

virtual void UpdateTaskbarTabIcon(HICON hIcon);

Parameters

hIcon
A handle to an icon to display on the Windows 7 taskbar tab.

Remarks

CMDIChildWndEx::UnregisterTaskbarTab

Removes the MDI child from Windows 7 taskbar tabs.

void UnregisterTaskbarTab(BOOL bCheckRegisteredMDIChildCount = TRUE);

Parameters

bCheckRegisteredMDIChildCount
Specifies whether this function needs to check the number of MDI children registered with MDI tabs. If this number is 0, then this function removes the clipping rectangle from the application's taskbar thumbnail.

Remarks

CMDIChildWndEx::SetTaskbarThumbnailClipRect

Called by the framework to set the clipping rectangle to select a portion of a window's client area to display as that window's thumbnail in the taskbar.

virtual BOOL SetTaskbarThumbnailClipRect(CRect rect);

Parameters

rect
Specifies the new clipping rectangle. If the rectangle is empty or null, the clipping is removed.

Return Value

TRUE if successful; otherwise FALSE.

Remarks

CMDIChildWndEx::SetTaskbarTabProperties

Sets properties for a Windows 7 taskbar tab.

void SetTaskbarTabProperties(DWORD dwFlags);

Parameters

dwFlags
A combination of STPFLAG values. For more information, see ITaskbarList4::SetTabProperties.

Remarks

CMDIChildWndEx::SetTaskbarTabOrder

Inserts the MDI child before the specified window on Windows 7 taskbar tabs.

void SetTaskbarTabOrder(CMDIChildWndEx* pWndBefore = NULL);

Parameters

pWndBefore
A pointer to the MDI child window whose thumbnail is inserted to the left. This window must already be registered through RegisterTaskbarTab. If this value is NULL, the new thumbnail is added to the end of the list.

Remarks

CMDIChildWndEx::SetTaskbarTabActive

Activates the corresponding Windows 7 taskbar tab.

void SetTaskbarTabActive();

Remarks

CMDIChildWndEx::RegisterTaskbarTab

Registers the MDI child with Windows 7 taskbar tabs.

virtual void RegisterTaskbarTab(CMDIChildWndEx* pWndBefore = NULL);

Parameters

pWndBefore
A pointer to the MDI child window whose thumbnail is inserted to the left. This window must already be registered through RegisterTaskbarTab. If this value is NULL, the new thumbnail is added to the end of the list.

Remarks

CMDIChildWndEx::OnTaskbarTabThumbnailStretch

Called by the framework when it needs to stretch a bitmap for a Windows 7 taskbar tab thumbnail preview of the MDI child.

virtual BOOL OnTaskbarTabThumbnailStretch(
    HBITMAP hBmpDst,
    const CRect& rectDst,
    HBITMAP hBmpSrc,
    const CRect& rectSrc);

Parameters

hBmpDst
A handle to a destination bitmap.

rectDst
Specifies the destination rectangle.

hBmpSrc
A handle to a source bitmap.

rectSrc
Specifies the source rectangle.

Remarks

Requirement : afxmdichildwndex.h

CMDIChildWndEx::OnTaskbarTabThumbnailMouseActivate

Called by the framework when the Taskbar tab thumbnail should process the WM_MOUSEACTIVATE message.

virtual int OnTaskbarTabThumbnailMouseActivate(
    CWnd* pDesktopWnd,
    UINT nHitTest,
    UINT message);

Parameters

pDesktopWnd
Specifies a pointer to the top-level parent window of the window being activated. The pointer may be temporary and should not be stored.

nHitTest
Specifies the hit-test area code. A hit test is a test that determines the location of the cursor.

message
Specifies the mouse message number.

Remarks

The default implementation activates the related MDI child frame.

CMDIChildWndEx::OnTaskbarTabThumbnailActivate

Called by the framework when the Taskbar tab thumbnail should process the WM_ACTIVATE message.

virtual void OnTaskbarTabThumbnailActivate(
    UINT nState,
    CWnd* pWndOther,
    BOOL bMinimized);

Parameters

nState
Specifies whether the CWnd is being activated or deactivated.

pWndOther
Pointer to the CWnd being activated or deactivated. The pointer can be NULL, and it may be temporary.

bMinimized
Specifies the minimized state of the CWnd being activated or deactivated. A value of TRUE indicates the window is minimized.

Remarks

The default implementation activates the related MDI child frame.

CMDIChildWndEx::OnPressTaskbarThmbnailCloseButton

Called by the framework when the user presses the close button on the Taskbar tab thumbnail.

virtual void OnPressTaskbarThmbnailCloseButton();

Remarks

CMDIChildWndEx::OnGetIconicThumbnail

Called by the framework when it needs to obtain a bitmap for the iconic thumbnail of the MDI child.

virtual HBITMAP OnGetIconicThumbnail(
    int nWidth,
    int nHeight);

Parameters

nWidth
Specifies the width of the required bitmap.

nHeight
Specifies the height of the required bitmap.

Remarks

CMDIChildWndEx::OnGetIconicLivePreviewBitmap

Called by the framework when it needs to obtain a bitmap for live preview of the MDI child.

virtual HBITMAP OnGetIconicLivePreviewBitmap(
    BOOL bIsMDIChildActive,
    CPoint& ptLocation);

Parameters

bIsMDIChildActive
This parameter is TRUE if the bitmap is requested for the MDI child, which is currently active and the main window is not minimized. The default processing in this case takes a snapshot of the main window.

ptLocation
Specifies the location of the bitmap in the main (top level) window client coordinates. This point should be provided by the callee.

Return Value

If processed, returns a handle to a valid 32bpp bitmap, otherwise NULL.

Remarks

Override this method in a derived class and return a valid 32bpp bitmap for live preview of MDI child. This method is called only when the MDI child is displayed on Windows 7 taskbar tabs. If you return NULL, MFC calls the default handlers and obtains bitmaps using PrintClient or PrintWindow.

CMDIChildWndEx::m_dwDefaultTaskbarTabPropertyFlags

A combination of flags, which is passed by the framework to the SetTaskbarTabProperties method, when a tab (MDI child) is being registered with Windows 7 taskbar tabs.

AFX_IMPORT_DATA static DWORD m_dwDefaultTaskbarTabPropertyFlags;

Remarks

The default combination is STPF_USEAPPTHUMBNAILWHENACTIVE | STPF_USEAPPPEEKWHENACTIVE.

CMDIChildWndEx::IsTaskbarThumbnailClipRectEnabled

Tells whether automatic selection of a portion of a window's client area to display as that window's thumbnail in the taskbar is enabled or disabled.

BOOL IsTaskbarThumbnailClipRectEnabled() const;

Return Value

Returns TRUE if automatic selection of a portion of a window's client area to display is enabled; otherwise FALSE.

Remarks

CMDIChildWndEx::IsTaskbarTabsSupportEnabled

Tells whether the MDI child can appear on Windows 7 taskbar tabs.

BOOL IsTaskbarTabsSupportEnabled();

Return Value

TRUE if the MDI child can appear on Windows 7 taskbar tabs; FALSE if the MDI child cannot appear on Windows 7 taskbar tabs.

Remarks

CMDIChildWndEx::IsRegisteredWithTaskbarTabs

Returns TRUE if the MDI child was successfully registered with Windows 7 taskbar tabs.

BOOL IsRegisteredWithTaskbarTabs();

Return Value

TRUE if the MDI child is registered with Windows 7 taskbar tabs; otherwise FALSE.

Remarks

CMDIChildWndEx::InvalidateIconicBitmaps

Invalidates an iconic bitmap representation of a MDI child.

BOOL InvalidateIconicBitmaps();

Return Value

Returns FALSE if Windows 7 taskbar support is disabled or the MDI child is not registered with Windows 7 taskbar tabs; otherwise returns TRUE.

Remarks

Should be called when the live content or size of a MDI child has changed.

CMDIChildWndEx::GetTaskbarThumbnailClipRect

Called by the framework when it needs to select a portion of a window's client area to display as that window's thumbnail in the taskbar.

virtual CRect GetTaskbarThumbnailClipRect() const;

Return Value

A rectangle in windows coordinates. This rectangle is mapped to the client area of the top level frame. The rectangle should be empty to clear the clipping rectangle.

Remarks

CMDIChildWndEx::GetTaskbarPreviewWnd

Called by the framework when it needs to obtain a child window (usually a view or splitter window) to be displayed on a Windows 7 taskbar tab thumbnail.

virtual CWnd* GetTaskbarPreviewWnd();

Return Value

Should return a valid pointer to a CWnd object, whose preview should be displayed on a Windows 7 taskbar tab related to this MDI child. The default implementation returns a child window of this MDI child with AFX_IDW_PANE_FIRST control ID (which is usually a CView-derived class).

Remarks

CMDIChildWndEx::GetTabProxyWnd

Returns the tab proxy window registered with Windows 7 taskbar tabs.

CMDITabProxyWnd* GetTabProxyWnd();

Return Value

A pointer to a CMDITabProxyWnd object, which is registered with Windows 7 taskbar tabs.

Remarks

CMDIChildWndEx::EnableTaskbarThumbnailClipRect

Enables or disables automatic selection of a portion of a window's client area to display as that window's thumbnail in the taskbar.

void EnableTaskbarThumbnailClipRect(BOOL bEnable = TRUE);

Parameters

bEnable
Specifies whether to enable (TRUE), or disable (FALSE) automatic selection of a portion of a window's client area to display.

Remarks

CMDIChildWndEx::CanShowOnTaskBarTabs

Tells the framework whether this MDI child can be displayed on Windows 7 taskbar tabs.

virtual BOOL CanShowOnTaskBarTabs();

Return Value

TRUE if the content of the MDI child can be displayed on Windows 7 taskbar thumbnails.

Remarks

Override this method in a derived class and return FALSE to disable the appearance of this MDI child on Windows 7 taskbar tabs.

CMDIChildWndEx::ActivateTopLevelFrame

Called by the framework to activate the top level frame when the application is activated from a taskbar tab.

virtual void ActivateTopLevelFrame();

Remarks

See also

Hierarchy Chart
Classes
CMDIChildWnd Class
CMFCWindowsManagerDialog Class
CMDIFrameWndEx Class