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Hello,

I want to have the Show/Hide Panels button in the right button of a toolbar removed and have the right button (chevron) only appear when there are toolbar buttons which are not visible. I was not able to find such a feature in your library.

Regards,

Ahmad.

Dear Ahmad,

To implement the auto-hidden chevron button, you should use a CExtBarContentExpandButton-derived class like this:

class CMyChevronButton : public CExtBarContentExpandButton {
public:
CMyChevronButton(
            CExtToolControlBar * pBar = NULL
            ) :
            CExtBarContentExpandButton(pBar)
{
}
virtual bool IsVisible() const
{
            if( m_buttons.GetSize() == 0 )
                        return false;
            return true;
}
}; // class CMyChevronButton

class CMyToolBar : public CExtToolControlBar {
public:
virtual CExtBarContentExpandButton * OnCreateBarRightBtn()
{
            CExtBarContentExpandButton * pRightBtn =
                        new CMyChevronButton( this );
            ASSERT_VALID( pRightBtn );
            return pRightBtn;
}
}; // class CMyToolBar

ON_REGISTERED_MESSAGE( 
CExtControlBar::g_nMsgConstructPopupMenu, 
OnConstructPopupMenuCB )
 
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 );
ASSERT( p_pmed->m_pWndEventSrc->GetSafeHwnd() != NULL );
ASSERT( ::IsWindow(p_pmed->m_pWndEventSrc->GetSafeHwnd()) ); ...
}

Hello,

This thing is fine as long as you want the button to be not visible but its space still remains. I actually want toolbar to shrink as well if no buttons are there for right button. It should appear as soon as some button added to right button.

I have actually seen a post on the other forum but those classes donot work fine alway especially for the case of windows restore button press.

Regards,

Ahmad.

Dear Ahmad,

Here is the source code for the toolbar that you need:

class CMyToolBar : public CExtToolControlBar
{
    class CMyChevronButton : public CExtBarContentExpandButton
    {
    public:
        CMyChevronButton(
            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 );
        }
    };
public:
    virtual CExtBarContentExpandButton * OnCreateBarRightBtn()
    {
        CExtBarContentExpandButton * pRightBtn =
            new CMyChevronButton( this );
        ASSERT_VALID( pRightBtn );
        return pRightBtn;
    }
protected:
    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();
        ((CMyChevronButton *)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 );
    }
};