www.pudn.com > vistaListCtrlDemo.zip > DropArrows.h

 
#pragma once 
 
class CDropArrows : public CWindowImpl< CDropArrows > 
{ 
public: 
	CDropArrows() 
	{ 
		m_bVertical = FALSE; 
		m_nSpanLength = 0; 
	} 
	 
	~CDropArrows() 
	{ 
	} 
	 
	DECLARE_WND_CLASS( _T( "DropArrows" ) ) 
 
protected: 
	CBrush m_bshArrowBrush; 
	CRgn m_rgnArrowRegion; 
	BOOL m_bVertical; 
	int m_nSpanLength; 
	 
public: 
	BOOL Create( HWND hWndParent, int nSpanLength, BOOL bVertical ) 
	{ 
		if ( !m_bshArrowBrush.CreateSolidBrush( RGB( 255, 0, 0 ) ) ) 
			return FALSE; 
			 
		m_bVertical = bVertical; 
		m_nSpanLength = nSpanLength + 20; 
 
		if ( CWindowImpl< CDropArrows >::Create( hWndParent, CRect( 0, 0, m_bVertical ? 12 : m_nSpanLength, m_bVertical ? m_nSpanLength : 12 ), NULL, WS_POPUP | WS_DISABLED, WS_EX_TOOLWINDOW ) == NULL ) 
			return FALSE; 
		 
		POINT ptArrow[ 7 ]; 
 
		ptArrow[0].x = bVertical ? 8 : 0;	ptArrow[0].y = bVertical ? 0 : 9; 
		ptArrow[1].x = bVertical ? 8 : 4;	ptArrow[1].y = bVertical ? 4 : 9; 
		ptArrow[2].x = bVertical ? 11 : 4;	ptArrow[2].y = bVertical ? 4 : 12; 
		ptArrow[3].x = bVertical ? 6 : 10;	ptArrow[3].y = bVertical ? 9 : 6; 
		ptArrow[4].x = bVertical ? 1 : 4;	ptArrow[4].y = bVertical ? 4 : 0; 
		ptArrow[5].x = bVertical ? 4 : 4;	ptArrow[5].y = bVertical ? 4 : 4; 
		ptArrow[6].x = bVertical ? 4 : 0;	ptArrow[6].y = bVertical ? 0 : 4; 
 
		CRgn rgnFirstArrow; 
		if ( !rgnFirstArrow.CreatePolygonRgn( ptArrow, 7, ALTERNATE ) ) 
			return FALSE; 
 
		ptArrow[0].x = bVertical ? 4 : m_nSpanLength;		ptArrow[0].y = bVertical ? m_nSpanLength : 4; 
		ptArrow[1].x = bVertical ? 4 : m_nSpanLength - 4;	ptArrow[1].y = bVertical ? m_nSpanLength - 4 : 4; 
		ptArrow[2].x = bVertical ? 0 : m_nSpanLength - 4;	ptArrow[2].y = bVertical ? m_nSpanLength - 4 : 0; 
		ptArrow[3].x = bVertical ? 6 : m_nSpanLength - 10;	ptArrow[3].y = bVertical ? m_nSpanLength - 10 : 6; 
		ptArrow[4].x = bVertical ? 12 : m_nSpanLength - 4;	ptArrow[4].y = bVertical ? m_nSpanLength - 4 : 12; 
		ptArrow[5].x = bVertical ? 8 : m_nSpanLength - 4;	ptArrow[5].y = bVertical ? m_nSpanLength - 4 : 9; 
		ptArrow[6].x = bVertical ? 8 : m_nSpanLength;		ptArrow[6].y = bVertical ? m_nSpanLength : 9; 
 
		CRgn rgnSecondArrow; 
		if ( !rgnSecondArrow.CreatePolygonRgn( ptArrow, 7, ALTERNATE ) ) 
			return FALSE; 
 
		if ( !m_rgnArrowRegion.CreateRectRgn( 0, 0, bVertical ? 12 : nSpanLength, bVertical ? nSpanLength : 12 ) ) 
			return FALSE; 
		 
		m_rgnArrowRegion.CombineRgn( rgnFirstArrow, rgnSecondArrow, RGN_OR ); 
		 
		SetWindowRgn( m_rgnArrowRegion, FALSE ); 
 
		return TRUE; 
	} 
	 
	BOOL Show( CPoint point ) 
	{ 
		return IsWindow() ? SetWindowPos( NULL, m_bVertical ? point.x - 7 : point.x - ( m_nSpanLength / 2 ), m_bVertical ? point.y - ( m_nSpanLength / 2 ) : point.y - 5, 0, 0, SWP_NOZORDER | SWP_NOSIZE | SWP_SHOWWINDOW | SWP_NOACTIVATE ) : FALSE; 
	} 
	 
	BOOL Hide() 
	{ 
		return IsWindow() ? ShowWindow( SW_HIDE ) : FALSE; 
	} 
	 
	BEGIN_MSG_MAP_EX(CDropArrows) 
		MSG_WM_DESTROY(OnDestroy) 
		MSG_WM_ERASEBKGND(OnEraseBkgnd) 
	END_MSG_MAP_EX() 
	 
	void OnDestroy() 
	{ 
		m_bshArrowBrush.DeleteObject(); 
		m_rgnArrowRegion.DeleteObject(); 
	} 
	 
	BOOL OnEraseBkgnd( HDC dc )  
	{ 
		CDCHandle dcErase( dc ); 
		dcErase.FillRect( CRect( 0, 0, m_bVertical ? 12 : m_nSpanLength, m_bVertical ? m_nSpanLength : 12 ), m_bshArrowBrush ); 
		return TRUE; 
	} 
};