scrlbar.c

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		}
	}
	else
	{   // 水平 SB_HORZ
		if( (lprcNew->right - lprcNew->left) < MIN_THUMBSIZE )
		{
			rect = *lprcNew;
#ifdef ZT_PHONE
			InflateRect( &rect, 0, -1 );
#endif
			FillRect( hdc, &rect, GetSysColorBrush(COLOR_SCROLLBAR) );
			return 0;
		}
	}
    {
		int iOldMode;
		int xyMid;
		HFONT hFont;
		BYTE bThumb;
        RECT rect = *lprcNew;
		//画滑块
		hBrush = GetSysColorBrush( COLOR_SCROLLBARTHUMB );//COLOR_3DFACE );
        hBrush = SelectObject( hdc, hBrush );

        Rectangle( hdc, lprcNew->left, lprcNew->top, lprcNew->right, lprcNew->bottom );

        hBrush = SelectObject( hdc, hBrush );

		// 选择符号字体 draw text 
		hFont = SelectObject( hdc, GetStockObject(SYSTEM_FONT_SYMBOL) );

	    iOldMode = SetBkMode( hdc, TRANSPARENT );
		
		if( fnBar == SB_VERT )
		{	//垂直
			xyMid = (lprcNew->bottom + lprcNew->top) / 2;
			rect.top = xyMid - 8;
			rect.bottom = xyMid + 8;
			bThumb = SYM_SCROLL_VTHUMB;
		}
		else
		{	//水平
			xyMid = (lprcNew->left + lprcNew->right) / 2;
			rect.left = xyMid - 8;
			rect.right = xyMid + 8;
			bThumb = SYM_SCROLL_HTHUMB;
		}

		SetTextColor( hdc, CL_WHITE );

	    DrawText( hdc, (LPCTSTR)&bThumb, 1, &rect, DT_CENTER|DT_VCENTER|DT_SINGLELINE );

		SetTextColor( hdc, CL_DARKGRAY );
		if( fnBar == SB_VERT )
		{
			rect.top++;
			rect.bottom++;
		}
		else
		{
			rect.left++;
			rect.right++;
		}
		DrawText( hdc, (LPCTSTR)&bThumb, 1, &rect, DT_CENTER|DT_VCENTER|DT_SINGLELINE );

	    SetBkMode( hdc, iOldMode );

		SelectObject( hdc, hFont );
    }
    return 0;
}

// **************************************************
// 声明：static int Scrl_DrawScrollBar( _LPSCROLL lpsd, HDC hdc )
// 参数：
//	IN lpsd - 滚动条数据对象指针
// 	IN hdc - 显示DC
// 返回值：
//	返回0
// 功能描述：
//	画滚动条
// 引用: 
//	
// ************************************************

static int Scrl_DrawScrollBar( _LPSCROLL lpsd, HDC hdc )
{
	RECT rect;
	int drawPos[6];
    HFONT hFont;
    int iOldMode;
	BYTE bArrow;

	if( lpsd->fnBar == SB_CORNER )
	{	//右下角
		FillRect( hdc, &lpsd->rect, GetSysColorBrush(COLOR_3DFACE) );
	}
	else
	{	//显示矩形
		rect = lpsd->rect;
		// 选择符号字体
		hFont = SelectObject( hdc, GetStockObject(SYSTEM_FONT_SYMBOL) );//
		//得到显示位置
		Scrl_GetDrawPos( lpsd, drawPos );
	
		if( lpsd->fnBar == SB_VERT )
		{	//垂直
			rect.top = drawPos[1];
			rect.bottom = drawPos[4];

#ifdef ZT_PHONE
			{
				HBRUSH hBrush = GetSysColorBrush(COLOR_SCROLLBAR);
				hBrush = SelectObject( hdc, hBrush );
				Rectangle( hdc, rect.left, rect.top, rect.right, rect.bottom );
				SelectObject( hdc, hBrush );
			}
#else
			FillRect( hdc, &rect, GetSysColorBrush(COLOR_SCROLLBAR) );
#endif

			// 画上箭头 draw up arrow
			rect.top = drawPos[0];   
			rect.bottom = drawPos[1];
			Rectangle( hdc, rect.left, rect.top, rect.right, rect.bottom );		
			iOldMode = SetBkMode( hdc, TRANSPARENT );			
			if( lpsd->sd.state & ESB_DISABLE_UP )
				SetTextColor( hdc, GetSysColor(COLOR_GRAYTEXT) );
			else
				SetTextColor( hdc, GetSysColor(COLOR_BTNTEXT) );
			bArrow = SYM_UPARROW;
			DrawText( hdc, (LPCTSTR)&bArrow, 1, &rect, DT_CENTER|DT_VCENTER|DT_SINGLELINE );

			// 画下箭头 draw down arrow
			rect.top = drawPos[4];
			rect.bottom = drawPos[5];
			SetBkMode( hdc, OPAQUE );
			Rectangle( hdc, rect.left, rect.top, rect.right, rect.bottom );			
			if( lpsd->sd.state & ESB_DISABLE_DOWN )
				SetTextColor( hdc, GetSysColor(COLOR_GRAYTEXT) );//CL_LIGHTGRAY );
			else
				SetTextColor( hdc, GetSysColor(COLOR_BTNTEXT) );//CL_BLACK );			
			bArrow = SYM_DOWNARROW;
			SetBkMode( hdc, TRANSPARENT );
			DrawText( hdc, (LPCTSTR)&bArrow, 1, &rect, DT_CENTER|DT_VCENTER|DT_SINGLELINE );

			// draw thumb
			rect.top = drawPos[2];
			rect.bottom = drawPos[3];
			SetBkMode( hdc, iOldMode );
			Scrl_DrawThumbBox( hdc, SB_VERT, lpsd->sd.state, 0, &rect );
		}
		else if( lpsd->fnBar == SB_HORZ )
		{	//水平
			rect.left = drawPos[1];
			rect.right = drawPos[4];
#ifdef ZT_PHONE
			{
				HBRUSH hBrush = GetSysColorBrush(COLOR_SCROLLBAR);
				hBrush = SelectObject( hdc, hBrush );
				Rectangle( hdc, rect.left, rect.top, rect.right, rect.bottom );
				SelectObject( hdc, hBrush );
			}
#else
			FillRect( hdc, &rect, GetSysColorBrush(COLOR_SCROLLBAR) );
#endif
			
			rect.left = drawPos[0];
			rect.right = drawPos[1];
			Rectangle( hdc, rect.left, rect.top, rect.right, rect.bottom );
			
			iOldMode = SetBkMode( hdc, TRANSPARENT );
			//画左箭头
			if( lpsd->sd.state & ESB_DISABLE_LEFT )
				SetTextColor( hdc, GetSysColor(COLOR_GRAYTEXT) );//CL_LIGHTGRAY );
			else
				SetTextColor( hdc, GetSysColor(COLOR_BTNTEXT) );//CL_BLACK );
			bArrow = SYM_LEFTARROW;
			DrawText( hdc, (LPCTSTR)&bArrow, 1, &rect, DT_CENTER|DT_VCENTER|DT_SINGLELINE );
			rect.left = drawPos[4];
			rect.right = drawPos[5];
			SetBkMode( hdc, OPAQUE );
			Rectangle( hdc, rect.left, rect.top, rect.right, rect.bottom );
			
			if( lpsd->sd.state & ESB_DISABLE_RIGHT )
				SetTextColor( hdc, GetSysColor(COLOR_GRAYTEXT) );//CL_LIGHTGRAY );
			else
				SetTextColor( hdc, GetSysColor(COLOR_BTNTEXT) );//CL_BLACK );
			//画右箭头			
			bArrow = SYM_RIGHTARROW;
			SetBkMode( hdc, TRANSPARENT );
			DrawText( hdc, (LPCTSTR)&bArrow, 1, &rect, DT_CENTER|DT_VCENTER|DT_SINGLELINE );
			SetBkMode( hdc, iOldMode );
			
			rect.left = drawPos[2];
			rect.right = drawPos[3];
			Scrl_DrawThumbBox( hdc, SB_HORZ, lpsd->sd.state, 0, &rect );
		}
		SelectObject( hdc, hFont );
	}
	return 0;
}

// **************************************************
// 声明：int Scrl_RedrawScrollBar( HWND hWnd, HDC hdc, int fnBar )
// 参数：
// 	IN hWnd - 窗口句柄
//	IN hdc - 显示DC句柄
//	IN fnBar - 滚动条类型，为下值：
//						SB_VERT - 垂直
//						SB_HORT - 水平
//						
// 返回值：
//	返回0
// 功能描述：
//	画滚动条
// 引用: 
//	
// ************************************************

int Scrl_RedrawScrollBar( HWND hWnd, HDC hdc, int fnBar )
{
    _SCROLL sd;
	//得到滚动条数据
	Scrl_GetScrollData( hWnd, fnBar, &sd );
	//画
	Scrl_DrawScrollBar( &sd, hdc );

	return 0;
}

// **************************************************
// 声明：static void Scrl_TranslatePos( HWND hWnd, int fnBar, short * lpx, short * lpy )
// 参数：
// 	IN hWnd - 窗口句柄
//	IN fnBar - 滚动条类型，为下值：
//						SB_VERT - 垂直
//						SB_HORT - 水平
//	IN/OUT lpx - 输入客户x坐标，输出窗口x坐标
//	IN/OUT lpy - 输入客户y坐标，输出窗口y坐标
// 返回值：
//	返回0
// 功能描述：
//	将客户坐标转成窗口坐标
// 引用: 
//	
// ************************************************

static void Scrl_TranslatePos( HWND hWnd, int fnBar, short * lpx, short * lpy )
{
    POINT pt;
    RECT rect;
    if( fnBar != SB_CTL )
    {
        if( lpx )
            pt.x = *lpx;
        if( lpy )
            pt.y = *lpy;
		//先转化为屏幕坐标
        ClientToScreen( hWnd, &pt );
		//得到窗口的屏幕矩形
        GetWindowRect( hWnd, &rect );
		//转化
        if( lpx )
            *lpx = (short)(pt.x - rect.left);
        if( lpy )
            *lpy = (short)(pt.y - rect.top);
    }
}

// **************************************************
// 声明：LRESULT Scrl_DoLBUTTONDOWN( HWND hWnd, int fnBar, int x, int y )
// 参数：
// 	IN hWnd - 窗口句柄
//	IN fnBar - 滚动条类型，为下值：
//						SB_VERT - 垂直
//						SB_HORT - 水平
//	IN x - 当前鼠标x位置
//	IN y - 当前鼠标y位置
// 返回值：
//	返回0
// 功能描述：
//	处理 WM_LBUTTONDOWN 消息
// 引用: 
//	
// ************************************************
#define SLEEP_TICK 200
LRESULT Scrl_DoLBUTTONDOWN( HWND hWnd, int fnBar, int x, int y )
{
	_SCROLL si;
	int posv[6], pos, oldPos, i;
	short nx, ny;
	HDC hdc;
    HBRUSH hBrush;
	RECT rect, oldRect;
	MSG msg;
	UINT dwMsg;
	BOOL edgeMsg = FALSE;
    WORD ncode;
	BOOL bHasTimer = FALSE;	
	DWORD dwTickCount;
	//得到滚动条数据
	Scrl_GetScrollData( hWnd, fnBar, &si );
    rect = si.rect;
	//得到显示位置
	Scrl_GetDrawPos( &si, posv );
	pos = (si.fnBar==SB_VERT) ? y : x;
	//得到鼠标在滚动条上的位置信息（i）
	for( i = 0; i < 5; i++ )
		if( pos >= posv[i] && pos < posv[i+1] )
			break;
	
	if( si.fnBar == SB_VERT )
	{	//垂直
		rect.top = posv[i];
		rect.bottom = posv[i+1];
		dwMsg = WM_VSCROLL;
    }
    else
    {	//水平
		rect.left = posv[i];
		rect.right = posv[i+1];
		dwMsg = WM_HSCROLL;
    }
	if( i == 0 || i == 4 )
    {	//在上/左 下/右 箭头区域
        ncode = (i == 0) ? SB_LINEUP : SB_LINEDOWN;
    }
	else if( i == 1 || i == 3 )
    {	//在上页  下页区域
        ncode = (i == 1 ) ? SB_PAGEUP : SB_PAGEDOWN;
    }
	else if( i == 2 )
    {	//在滑快
        ncode = SB_THUMBTRACK;
    }
    if( (si.sd.state & ESB_DISABLE_LTUP) && 
        (ncode == SB_LINEUP || ncode == SB_PAGEUP || ncode == SB_THUMBTRACK ) )
    {	//无效上
        return 0;
    }
    else if ( (si.sd.state & ESB_DISABLE_RTDN) && 
              (ncode == SB_LINEDOWN || ncode == SB_PAGEDOWN || ncode == SB_THUMBTRACK ) )
    {	//无效下
        return 0;
    }

	if( i == 2 )
    {	//设置跟踪状态
        Scrl_SetScrollState( hWnd, fnBar, SBS_TRACKTHUMB, TRUE );
    }

	oldRect = rect;
	oldPos = si.sd.nPos;
	//抓住鼠标
	SetCapture( hWnd );

    if( ncode != SB_THUMBTRACK )
        Scrl_SendScrollMsg( hWnd, fnBar, dwMsg, MAKELONG( ncode, 0 ), (LPARAM)hWnd );
	//得到显示DC
    hdc = Scrl_GetScrollDC( hWnd, fnBar );
	hBrush = (HBRUSH)SelectObject( hdc, GetStockObject( LTGRAY_BRUSH ) );

#ifdef EML_DOS
    _ShowMouse();
#endif
	if( ncode != SB_THUMBTRACK )
	{
		bHasTimer = TRUE;	    
	}
	dwTickCount = GetTickCount();
	//进入模式处理状态
	// do modal loop
	while( GetCapture() == hWnd )
	{
		BOOL bHandleTimer = FALSE;
		
		if( bHasTimer )
			SetSysTimer( hWnd, IDSCROLLBAR, SLEEP_TICK, NULL );
		//得到消息
        if( GetMessage( &msg, 0, 0, 0 ) )
		{	//处理消息
			if( bHasTimer )
			    KillSysTimer( hWnd, IDSCROLLBAR );
			if( msg.message == WM_LBUTTONUP )
			{
#ifdef EML_DOS
    _HideMouse();
#endif
                if( i == 1 || i == 3 )
                {
//                    InvertRect( hdc, &rect );
                }

				if( i == 0 || i == 4 )
                {
//				    DrawEdge( hdc, &rect, BDR_RAISEDOUTER, BF_RECT );
                }
#ifdef EML_DOS
    _ShowMouse();
#endif
				if( i == 2 )
				{	// clear background
//#ifdef EML_DOS
//    _HideMouse();
//#endif
//                    Scrl_DrawThumbBox( hdc, fnBar, &oldRect, FALSE );
//#ifdef EML_DOS
//    _ShowMouse();
//#endif
					//画滑快
                    Scrl_SetScrollState( hWnd, fnBar, SBS_TRACKTHUMB, FALSE );
					Scrl_SendScrollMsg( hWnd, fnBar, dwMsg, MAKELONG( SB_THUMBPOSITION, oldPos ), (LPARAM)hWnd );
				}
                Scrl_SendScrollMsg( hWnd, fnBar, dwMsg, (WPARAM)MAKELONG( SB_ENDSCROLL, 0 ), (LPARAM)hWnd );
				if( i == 2 )
				{
                    // redraw thumb box
                    Scrl_GetScrollData( hWnd, fnBar, &si );
	                Scrl_GetDrawPos( &si, posv );
                	if( si.fnBar == SB_VERT )
	                {
		                rect.top = posv[i];
		                rect.bottom = posv[i+1];
					}
					else if( si.fnBar == SB_HORZ )
					{
		                rect.left = posv[i];
		                rect.right = posv[i+1];
					}
#ifdef EML_DOS
    _HideMouse();
#endif
                    Scrl_DrawThumbBox( hdc, si.fnBar, si.sd.state, &oldRect, &rect );  //2000.12.08
#ifdef EML_DOS
    _ShowMouse();
#endif
				}
				break;
			}
			else if( msg.message == WM_MOUSEMOVE )
			{
				if( i == 2 )
				{	// thumb box
					if( si.fnBar == SB_VERT )
					{
                        ny = HIWORD( msg.lParam );
                        Scrl_TranslatePos( hWnd, fnBar, 0, &ny );

						ny = ny - y;
						// draw thumb box
					    rect.top = posv[2] + ny;
						rect.bottom = posv[3] + ny;

						if( rect.bottom <= posv[4] && rect.top >= posv[1] )
						{
#ifdef EML_DOS
    _HideMouse();
#endif
						    // clear background
							// draw thumb box
                           Scrl_DrawThumbBox( hdc, fnBar, si.sd.state, &oldRect, &rect );
#ifdef EML_DOS
    _ShowMouse();
#endif
							oldRect = rect;
							{  // LN, 2003-07-12  error: ( posv[4] - posv[1] - (posv[3]-posv[2]) ) == 0
								int diff = ( posv[4] - posv[1] - (posv[3]-posv[2]) );
								if( diff )
							        pos = si.sd.nMin + (rect.top-posv[1]) * (si.sd.nMax-si.sd.nMin-si.sd.nPage+1) / diff;
								else
								{  // diff = 0
									;// nothing to do 
								}
							}
							if( pos != oldPos )
							{
							    Scrl_SendScrollMsg( hWnd, fnBar, dwMsg, MAKELONG( SB_THUMBTRACK, pos ), (LPARAM)hWnd );
							    oldPos = pos;
							}
							edgeMsg = FALSE;
						}
						else if( edgeMsg == FALSE )
						{
							if( rect.bottom > posv[4] )
							{
								pos = si.sd.nMax - si.sd.nPage + 1;
							    Scrl_SendScrollMsg( hWnd, fnBar, dwMsg, MAKELONG( SB_THUMBTRACK, pos ), (LPARAM)hWnd );