winsbar.c

神龙卡开发原代码

			rc = hwnd->vscroll.rc;
			moveTop = rc.top + mwSYSMETRICS_CYVSCROLL;
			moveBottom = hwnd->vscroll.rc.bottom - mwSYSMETRICS_CYVSCROLL;
			moveRange = moveBottom - moveTop;

			itemCount = hwnd->vscroll.maxPos - hwnd->vscroll.minPos + 1;
			itemVisible = hwnd->vscroll.pageStep;
			itemMoveable = itemCount - itemVisible + 1;

			newThumbPos = ((pt.y - moveTop) * itemMoveable) / moveRange;
			printf("((%d-%d)*%d)/%d=%d\n",
				pt.y,moveTop,itemMoveable,moveRange,newThumbPos);

			if ( newThumbPos >= hwnd->vscroll.minPos &&
			     newThumbPos <= hwnd->vscroll.maxPos)
				SendMessage (hwnd,
					WM_VSCROLL, SB_THUMBTRACK, newThumbPos);
			break;
		    }

		    if (hitcode == HTHSCROLL && horzbar) 
		    {
			/* jmt(2k0819): new algorithm for SB_THUMBTRACK */

			rc = hwnd->hscroll.rc;
			moveLeft = rc.left + mwSYSMETRICS_CXHSCROLL;
			moveRight = hwnd->hscroll.rc.right - mwSYSMETRICS_CXHSCROLL;
			moveRange = moveRight - moveLeft;

			itemCount = hwnd->hscroll.maxPos - hwnd->hscroll.minPos + 1;
			itemVisible = hwnd->hscroll.pageStep;
			itemMoveable = itemCount - itemVisible + 1;

			newThumbPos = ((pt.x - moveLeft) * itemMoveable) / moveRange;
			printf("((%d-%d)*%d)/%d=%d\n",
				pt.y,moveLeft,itemMoveable,moveRange,newThumbPos);
    
			if ( newThumbPos >= hwnd->hscroll.minPos &&
			     newThumbPos <= hwnd->hscroll.maxPos)
				SendMessage (hwnd,
					WM_HSCROLL, SB_THUMBTRACK, newThumbPos);
			break;
		    }
	     }
	     else	/* jmt:2k0820 */
	     {
		    if (hitcode == HTVSCROLL && vertbar) 
			SendMessage (hwnd, WM_VSCROLL, sbCode, 0);

		    if (hitcode == HTHSCROLL && horzbar) 
			SendMessage (hwnd, WM_HSCROLL, sbCode, 0);
	     }
	break;
	}

}


static BOOL
PtInRect2(const RECT *lprc, int x, int y)
{
	POINT	p;

	p.x = x;
	p.y = y;
	return PtInRect(lprc, p);
}

#if 1	/* 0000 */


static void
wndScrollBarPos (HWND hwnd, BOOL bIsHBar, RECT* rcBar)
{
    UINT moveRange;
    PMWSCROLLBARINFO pSBar;

    if (bIsHBar)
        pSBar = &hwnd->hscroll;
    else
        pSBar = &hwnd->vscroll;

    if (pSBar->minPos == pSBar->maxPos) {
        pSBar->status |= SBS_HIDE;
        return;
    }

    if (bIsHBar)
        moveRange = (rcBar->right - rcBar->left) - (mwSYSMETRICS_CXHSCROLL<<1);
    else
        moveRange = (rcBar->bottom - rcBar->top) - (mwSYSMETRICS_CYVSCROLL<<1);

#define MWM_DEFBARLEN	18
#define MWM_MINBARLEN	8

    if (pSBar->pageStep == 0) 
    {
        pSBar->barLen = MWM_DEFBARLEN;

        if (pSBar->barLen > moveRange)
            pSBar->barLen = MWM_MINBARLEN;
    }
    else 
    {
        pSBar->barLen = moveRange * pSBar->pageStep /
	      (pSBar->maxPos - pSBar->minPos + 1);
        if (pSBar->barLen < MWM_MINBARLEN)
            pSBar->barLen = MWM_MINBARLEN;
    }

    pSBar->barStart = moveRange * (pSBar->curPos - pSBar->minPos) /
       (pSBar->maxPos - pSBar->minPos + 1);


    if (pSBar->barStart + pSBar->barLen > moveRange)
        pSBar->barStart = moveRange - pSBar->barLen;


    if (pSBar->barStart < 0)
        pSBar->barStart = 0;
}

static PMWSCROLLBARINFO wndGetScrollBar (HWND pWin, int iSBar)
{
    if (iSBar == SB_HORZ) {
        if (pWin->style & WS_HSCROLL)
            return &pWin->hscroll;
    }
    else if (iSBar == SB_VERT) {
        if (pWin->style & WS_VSCROLL)
            return &pWin->vscroll;
    }

    return NULL;
}

BOOL  EnableScrollBar (HWND hWnd, int iSBar, BOOL bEnable)
{
    PMWSCROLLBARINFO pSBar;
    HWND pWin;
    BOOL bPrevState;
    RECT rcBar;
    
    pWin = (HWND)hWnd;
    
    if ( !(pSBar = wndGetScrollBar (pWin, iSBar)) )
        return FALSE;

    bPrevState = !(pSBar->status & SBS_DISABLED);

    if (bEnable && !bPrevState)
        pSBar->status &= ~SBS_DISABLED;
    else if (!bEnable && bPrevState)
        pSBar->status |= SBS_DISABLED;
    else
        return FALSE;

    if (iSBar == SB_VERT)
    {
        wndGetVScrollBarRect (pWin, &rcBar);
        rcBar.left --;
        rcBar.right --;
    }
    else
    {
        wndGetHScrollBarRect (pWin, &rcBar);
        rcBar.top  --;
        rcBar.bottom --;
    }
#if 0
    SendMessage (hWnd, WM_NCPAINT, 0, (LPARAM)(&rcBar));
#else
    MwPaintNCScrollbars(hWnd,NULL);	/* a must */
#endif

    return TRUE;
}

BOOL  GetScrollPos (HWND hWnd, int iSBar, int* pPos)
{
    PMWSCROLLBARINFO pSBar;
    HWND pWin;
    
    pWin = (HWND)hWnd;
    
    if ( !(pSBar = wndGetScrollBar (pWin, iSBar)) )
        return FALSE;

    *pPos = pSBar->curPos;
    return TRUE;
}

BOOL  GetScrollRange (HWND hWnd, int iSBar, int* pMinPos, int* pMaxPos)
{
    PMWSCROLLBARINFO pSBar;
    HWND pWin;
    
    pWin = (HWND)hWnd;
    
    if ( !(pSBar = wndGetScrollBar (pWin, iSBar)) )
        return FALSE;

    *pMinPos = pSBar->minPos;
    *pMaxPos = pSBar->maxPos;
    return TRUE;
}

BOOL  SetScrollPos (HWND hWnd, int iSBar, int iNewPos)
{
    PMWSCROLLBARINFO pSBar;
    HWND pWin;
    RECT rcBar;
    
    pWin = (HWND)hWnd;
    
    if ( !(pSBar = wndGetScrollBar (pWin, iSBar)) )
        return FALSE;

    if (iNewPos < pSBar->minPos)
        pSBar->curPos = pSBar->minPos;
    else
        pSBar->curPos = iNewPos;

    {
        int max = pSBar->maxPos;
        max -= ((pSBar->pageStep - 1) > 0)?(pSBar->pageStep - 1):0;

        if (pSBar->curPos > max)
            pSBar->curPos = max;
    }
    
    if (iSBar == SB_VERT)
    {
        wndGetVScrollBarRect (pWin, &rcBar);
        rcBar.left --;
        rcBar.right --;
    }
    else
    {
        wndGetHScrollBarRect (pWin, &rcBar);
        rcBar.top  --;
        rcBar.bottom --;
    }

    wndScrollBarPos (pWin, iSBar == SB_HORZ, &rcBar);

#if 0
    SendMessage (hWnd, WM_NCPAINT, 0, (LPARAM)(&rcBar));
#else
    MwPaintNCScrollbars(hWnd,NULL);	/* a must */
#endif
    return TRUE;
}

BOOL  SetScrollRange (HWND hWnd, int iSBar, int iMinPos, int iMaxPos)
{
    PMWSCROLLBARINFO pSBar;
    HWND pWin;
    RECT rcBar;
    
    pWin = (HWND)hWnd;
    
    if ( !(pSBar = wndGetScrollBar (pWin, iSBar)) )
        return FALSE;

    pSBar->minPos = (iMinPos < iMaxPos)?iMinPos:iMaxPos;
    pSBar->maxPos = (iMinPos > iMaxPos)?iMinPos:iMaxPos;
    
    /* validate parameters. */
    if (pSBar->curPos < pSBar->minPos)
        pSBar->curPos = pSBar->minPos;

    if (pSBar->pageStep <= 0)
        pSBar->pageStep = 0;
    else if (pSBar->pageStep > (pSBar->maxPos - pSBar->minPos + 1))
        pSBar->pageStep = pSBar->maxPos - pSBar->minPos + 1;
    
    {
        int max = pSBar->maxPos;
        max -= ((pSBar->pageStep - 1) > 0)?(pSBar->pageStep - 1):0;

        if (pSBar->curPos > max)
            pSBar->curPos = max;
    }

    if (iSBar == SB_VERT)
    {
        wndGetVScrollBarRect (pWin, &rcBar);
    	rcBar.left --;
      	rcBar.right --;
    }
    else
    {
        wndGetHScrollBarRect (pWin, &rcBar);
    	rcBar.top  --;
    	rcBar.bottom --;
    }
    wndScrollBarPos (pWin, iSBar == SB_HORZ, &rcBar);

#if 0
    SendMessage (hWnd, WM_NCPAINT, 0, (LPARAM)(&rcBar));
#else
    MwPaintNCScrollbars(hWnd,NULL);	/* a must */
#endif

    return TRUE;
}

BOOL  SetScrollInfo (HWND hWnd, int iSBar, 
                LPCSCROLLINFO lpsi, BOOL fRedraw)
{
    PMWSCROLLBARINFO pSBar;
    HWND pWin;
    RECT rcBar;
    
    pWin = (HWND)hWnd;
    
    if ( !(pSBar = wndGetScrollBar (pWin, iSBar)) )
        return FALSE;
        
    if( lpsi->fMask & SIF_RANGE )
    {
        pSBar->minPos = (lpsi->nMin < lpsi->nMax)?lpsi->nMin:lpsi->nMax;
        pSBar->maxPos = (lpsi->nMin < lpsi->nMax)?lpsi->nMax:lpsi->nMin;
    }
    
    if( lpsi->fMask & SIF_POS )
        pSBar->curPos = lpsi->nPos;
    
    if( lpsi->fMask & SIF_PAGE )
        pSBar->pageStep = lpsi->nPage;

    /* validate parameters. */
    if (pSBar->curPos < pSBar->minPos)
        pSBar->curPos = pSBar->minPos;

    if (pSBar->pageStep <= 0)
        pSBar->pageStep = 0;
    else if (pSBar->pageStep > (pSBar->maxPos - pSBar->minPos + 1))
        pSBar->pageStep = pSBar->maxPos - pSBar->minPos + 1;
    
    {
        int max = pSBar->maxPos;
        max -= ((pSBar->pageStep - 1) > 0)?(pSBar->pageStep - 1):0;

        if (pSBar->curPos > max)
            pSBar->curPos = max;
    }

    if(fRedraw)
    {
        if (iSBar == SB_VERT)
	{
            wndGetVScrollBarRect (pWin, &rcBar);
            rcBar.left --;
            rcBar.right --;
	}
        else
	{
            wndGetHScrollBarRect (pWin, &rcBar);
            rcBar.top --;
            rcBar.bottom --;
	}
        wndScrollBarPos (pWin, iSBar == SB_HORZ, &rcBar);

#if 0
        SendMessage (hWnd, WM_NCPAINT, 0, (LPARAM)(&rcBar));
#else
	MwPaintNCScrollbars(hWnd,NULL);	/* a must */
#endif
    }
    
    return TRUE;
}

BOOL  GetScrollInfo(HWND hWnd, int iSBar, LPSCROLLINFO lpsi)
{
    PMWSCROLLBARINFO pSBar;
    HWND pWin;
    
    pWin = (HWND)hWnd;
    
    if ( !(pSBar = wndGetScrollBar (pWin, iSBar)) )
        return FALSE;
        
    if( lpsi->fMask & SIF_RANGE )
    {
        lpsi->nMin = pSBar->minPos;
        lpsi->nMax = pSBar->maxPos;
    }
    
    if( lpsi->fMask & SIF_POS )
    {
        lpsi->nPos = pSBar->curPos;
    }
    
    if( lpsi->fMask & SIF_PAGE )
        lpsi->nPage = pSBar->pageStep;
    
    return TRUE;
}

BOOL  ShowScrollBar (HWND hWnd, int iSBar, BOOL bShow)
{
    PMWSCROLLBARINFO pSBar;
    HWND pWin;
    BOOL bPrevState;
    RECT rcBar;
    
    pWin = (HWND)hWnd;
    
    if ( !(pSBar = wndGetScrollBar (pWin, iSBar)) )
        return FALSE;

    bPrevState = !(pSBar->status & SBS_HIDE);

    if (bShow && !bPrevState)
        pSBar->status &= ~SBS_HIDE;
    else if (!bShow && bPrevState)
        pSBar->status |= SBS_HIDE;
    else
        return FALSE;
#if 0	/* fix: no WM_CHANGESIZE */
    SendMessage (hWnd, WM_CHANGESIZE, 0, 0);
#endif
    if (iSBar == SB_VERT)
        wndGetVScrollBarRect (pWin, &rcBar);
    else
        wndGetHScrollBarRect (pWin, &rcBar);

    {
        RECT rcWin, rcClient;
        
        memcpy (&rcWin, &pWin->winrect.left, sizeof (RECT));
        
        rcClient.left = 0;
        rcClient.top  = 0;
        rcClient.right = pWin->clirect.right - pWin->clirect.left;
        rcClient.bottom = pWin->clirect.bottom - pWin->clirect.top;
#if 0	/* fix: no WM_SIZECHANGED */
        SendMessage/*SendAsyncMessage*/ (hWnd, WM_SIZECHANGED, 
            (WPARAM)&rcWin, (LPARAM)&rcClient);
#endif
    }
    
    if (bShow) {
        SendMessage (hWnd, WM_NCPAINT, 0, 0);
    }
    else {
        rcBar.left -= pWin->clirect.left;
        rcBar.top  -= pWin->clirect.top;
        rcBar.right -= pWin->clirect.left;
        rcBar.bottom -= pWin->clirect.top;
        SendMessage (hWnd, WM_NCPAINT, 0, 0);
        InvalidateRect (hWnd, &rcBar, TRUE);
    }

    return TRUE;
}
#endif