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I’m looking for a way to modify menu items in the chevrons of the toolbars. What I am dealing with is there are toolbars listed in the Hide/Show and Customize Buttons section of the chevron menu that I do not want listed here, but I do want thenm listed when a user goes to the Customize dialog. How do I obtain a handle to this menu. Also I would be just as happy to have the Hide/Show and Customize Buttons menu removed all together and have the chevron menu only appear when there are buttons not visible. This would save interface space and the user can still hide and show toolbars by right clicking.

Dear James,

It is possible to modify any Prof-UIS menus on-the-fly, including chevron menu. Prof-UIS sends the CExtControlBar::g_nMsgConstructPopupMenu registered message to the frame window. WPARAM is pointer to CExtControlBar::POPUP_MENU_EVENT_DATA structure which describes type of the CExtPopupMenuWnd object to be constructed dynamically. Frame window receives this message two times for each type of menu. First time, the menu object is empty and frame window may construct it starting from scratch. If frame window returns not-zero value - framework will use the constructed menu as is. In other case, when zero returned first time, frame window receives this message again, but popup menu already constructed and contains default items. Second message can be used to modify default menus. This technique used by the CMainFrame::OnConstructPopupMenuCB() method of the ProfStudio example. Implementation rules are not very complicated:

1) Please add this line to your frame window class definition:
afx_msg LRESULT OnConstructPopupMenuCB( WPARAM wParam, LPARAM lParam );

2) Then add this line to your frame message map:
ON_REGISTERED_MESSAGE( CExtControlBar::g_nMsgConstructPopupMenu, OnConstructPopupMenuCB )

3) your message handler should look like this:

LRESULT CMainFrame::OnConstructPopupMenuCB(
WPARAM wParam, LPARAM lParam )
{
	ASSERT_VALID( this );
	lParam;
CExtControlBar::POPUP_MENU_EVENT_DATA * p_pmed =
		CExtControlBar::POPUP_MENU_EVENT_DATA::
			FromWParam( wParam );
	ASSERT( p_pmed != NULL );
	ASSERT_VALID( p_pmed->m_pPopupMenuWnd );
	ASSERT_VALID( p_pmed->m_pWndEventSrc );
	if( p_pmed->m_nHelperNotificationType ==
		CExtControlBar::POPUP_MENU_EVENT_DATA
			::__PMED_??? )
	{
		if( p_pmed->m_bPostNotification )
			return 0;
// construct your menu here
// (use p_pmed->m_pPopupMenuWnd object)
		return (!0);
	}
	return 0;
}

Type of the popup menu is described by p_pmed->m_nHelperNotificationType. Here is the list of all the menu types:

• __PMED_DOCKBAR_CTX - dockbar context menu


• __PMED_CONTROLBAR_CTX - any control bar context menu (client area)


• __PMED_CONTROLBAR_NC_CTX - any control bar context menu (non-client area)


• __PMED_STATUSBAR_CTX - statusbar context menu


• __PMED_AUTOHIDESLIDER_CTX - autohide slider window context menu


• __PMED_MINIFRAME_NC_CTX - miniframe context menu (non-client area)


• __PMED_MDICLIAREA_CTX - mdi client area context nenu


• __PMED_MDITABS_CTX - mdi-tabs window


• __PMED_AUTOHIDETABS_CTX - autohide-tabs window


• __PMED_DYNCBCTABS_CTX - dynamic control bar container tabs window


• __PMED_CONTROLBAR_NCBTNMENU_TOP - control bar nc-area-menu-button - top level


• __PMED_CONTROLBAR_NCBTNMENU_BARS - control bar nc-area-menu-button - control bars list


• __PMED_CTXEXPBTN_TOP - content expand button(chevron) - top level


• __PMED_CTXEXPBTN_APPEND - content expand button(chevron) - append to buttons list


• __PMED_CTXEXPBTN_BARS - content expand button(chevron) - control bars list

To modify the chevron button behavior (its visibility) you should use your own button class derived from CExtBarContentExpandButton and override IsVisible() virtual method (return value should depend on item count in the CExtBarContentExpandButton::m_buttons array of buttons hidden in the chevron). To make toolbars use your chevron button you also should use your CExtToolControlBar-derived class and override the OnCreateBarRightBtn() method. It just should return new CExtBarContentExpandButton object.

Please do not hesitate contact us if you will come across with any difficulties.

Thanks for all your help. I was able to modify the menus and hide the Chevron menus when needed. However one of my reasons for hiding the Chevron menus was for real estate reasons, and I noticed the toolbars seem to be the same length regardless. See ftp://ftp.hash.com/pub/misc/ButtonSpace.jpg

Dear Daniel,

We have coded "auto-hide" chevron buttons. It seems to us the following source code should fit your requirements:

class CMyRightBtn :
	public CExtBarContentExpandButton
{
public:
	CMyRightBtn(
		CExtToolControlBar * pBar = NULL
		) : CExtBarContentExpandButton( pBar )
	{
	}
	virtual CSize CalculateLayout(
		CDC & dc,
		CSize sizePreCalc,
		BOOL bHorz
		)
	{
		if( GetStyle() & TBBS_HIDDEN )
			return CSize( 0, 0 );
		return CExtBarContentExpandButton::
			CalculateLayout(
				dc, sizePreCalc, bHorz );
	}
	void _AdjustVisibility()
	{
		if( m_buttons.GetSize() == 0 )
			ModifyStyle( TBBS_HIDDEN );
		else
			ModifyStyle( 0, TBBS_HIDDEN );
	}
};
class CMyToolControlBar : public CExtToolControlBar
{
public:
	virtual CExtBarContentExpandButton *
				OnCreateBarRightBtn()
	{
		return new CMyRightBtn( this );
	}
	CSize _CalcLayout(
		DWORD dwMode, int nLength = -1 )
	{
		CExtBarContentExpandButton *
			pRightButton = GetRightButton();
		if( pRightButton == NULL )
		{
			VERIFY( InitContentExpandButton() );
			pRightButton = GetRightButton();
			ASSERT( pRightButton != NULL );
		} // if( pRightButton == NULL )
		_RecalcPositionsImpl();
		CSize _sizeLayout =
			CExtToolControlBar::_CalcLayout(
				dwMode, nLength );
		_RecalcPositionsImpl();
		((CMyRightBtn *)pRightButton)->
			_AdjustVisibility();
		_sizeLayout =
			CExtToolControlBar::_CalcLayout(
				dwMode, nLength );
		return _sizeLayout;
	}
	CSize CalcDynamicLayout(
		int nLength, DWORD dwMode)
	{
		if(	(nLength == -1)
			&& !(dwMode & (LM_MRUWIDTH|LM_COMMIT))
			&&  (dwMode & (LM_HORZDOCK|LM_VERTDOCK))
			)
			return
				CalcFixedLayout(
					dwMode & LM_STRETCH,
					dwMode & LM_HORZDOCK
					);
		ASSERT(
			(dwMode&(LM_HORZ|LM_HORZDOCK))
			||
			(!(dwMode&LM_HORZDOCK))
			);
		return _CalcLayout( dwMode, nLength );
	}
	CSize CalcFixedLayout(
		BOOL bStretch,
		BOOL bHorz
		)
	{
		DWORD dwMode = bStretch ? LM_STRETCH : 0;
		dwMode |= bHorz ? LM_HORZ : 0;
		ASSERT(
			(dwMode&(LM_HORZ|LM_HORZDOCK))
			||
			(!(dwMode&LM_HORZDOCK))
			);
		return _CalcLayout( dwMode );
	}
};