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/*
 * Copyright (c) 2000 Greg Haerr <greg@censoft.com>
 * Portions Copyright (c) 1999, 2000, Wei Yongming.
 * jmt: scrollbar thumb ported
 *
 * Microwindows win32 NonClient Scrollbars
 */
#define MWINCLUDECOLORS
#include "windows.h"
#include "wintern.h"
#include "wintools.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
 
/* scrollbar status/positions*/
#define SBS_UNKNOWN		0x0000
#define SBS_LEFTARROW		0x0001
#define SBS_RIGHTARROW		0x0002
#define SBS_LEFTSPACE		0x0004
#define SBS_RIGHTSPACE		0x0008
#define SBS_HORZTHUMB		0x0010
#define SBS_UPARROW		0x0020
#define SBS_DOWNARROW		0x0040
#define SBS_UPSPACE		0x0080
#define SBS_DOWNSPACE		0x0100
#define SBS_VERTTHUMB		0x0200
#define SBS_MASK		0x03ff
#define SBS_DISABLED		0x4000
#define SBS_HIDE		0x8000
 
#define HSCROLLBARVISIBLE(hwnd)	((hwnd)->style & WS_HSCROLL)
#define VSCROLLBARVISIBLE(hwnd)	((hwnd)->style & WS_VSCROLL)
 
/* 
 * Adjust client area smaller if scrollbars visible.
 * Also, compute the NC hittest regions for the scrollbars.
 */
void
MwAdjustNCScrollbars(HWND hwnd)
{
	BOOL	vertbar = VSCROLLBARVISIBLE(hwnd);
        BOOL	horzbar = HSCROLLBARVISIBLE(hwnd);
 
	if (vertbar) {
		hwnd->clirect.right -= mwSYSMETRICS_CXVSCROLL;
		if (horzbar)
			hwnd->clirect.bottom -= mwSYSMETRICS_CYHSCROLL;
		hwnd->vscroll.rc.left = hwnd->clirect.right;
		hwnd->vscroll.rc.right = hwnd->clirect.right +
			mwSYSMETRICS_CXVSCROLL;
		hwnd->vscroll.rc.top = hwnd->clirect.top;
		hwnd->vscroll.rc.bottom = hwnd->clirect.bottom;
	} else
		SetRectEmpty(&hwnd->vscroll.rc);
	if (horzbar) {
		if (!vertbar)
			hwnd->clirect.bottom -= mwSYSMETRICS_CYHSCROLL;
		hwnd->hscroll.rc.top = hwnd->clirect.bottom;
		hwnd->hscroll.rc.bottom = hwnd->clirect.bottom +
			mwSYSMETRICS_CYHSCROLL;
		hwnd->hscroll.rc.left = hwnd->clirect.left;
		hwnd->hscroll.rc.right = hwnd->clirect.right;
	} else
		SetRectEmpty(&hwnd->hscroll.rc);
}
 
static int
wndGetBorder(HWND hwnd)
{
	if (hwnd->style & WS_BORDER)  {
		if ((hwnd->style & WS_CAPTION) == WS_CAPTION)
			return mwSYSMETRICS_CXFRAME;
		return mwSYSMETRICS_CXBORDER;
	}
	return 0;
}
 
static BOOL
wndGetVScrollBarRect (HWND hwnd, RECT* rcVBar)
{
    if (hwnd->style & WS_VSCROLL) {
        rcVBar->left = hwnd->winrect.right - mwSYSMETRICS_CXVSCROLL
                        - wndGetBorder (hwnd);
        rcVBar->right = hwnd->winrect.right - wndGetBorder (hwnd);
        rcVBar->top  = hwnd->clirect.top;
        rcVBar->bottom = hwnd->winrect.bottom - wndGetBorder (hwnd);
 
        if (hwnd->style & WS_HSCROLL && !(hwnd->hscroll.status & SBS_HIDE))
            rcVBar->bottom -= mwSYSMETRICS_CYHSCROLL;
 
        return TRUE;
    }
 
    return FALSE;
}
 
static BOOL
wndGetHScrollBarRect (HWND hwnd, RECT* rcHBar)
{
    if (hwnd->style & WS_HSCROLL) {
        rcHBar->top = hwnd->winrect.bottom - mwSYSMETRICS_CYHSCROLL
                        - wndGetBorder (hwnd);
        rcHBar->bottom = hwnd->winrect.bottom - wndGetBorder (hwnd);
        rcHBar->left  = hwnd->clirect.left;
        rcHBar->right = hwnd->winrect.right - wndGetBorder (hwnd);
 
        if (hwnd->style & WS_VSCROLL && !(hwnd->vscroll.status & SBS_HIDE))
            rcHBar->right -= mwSYSMETRICS_CXVSCROLL;
 
        return TRUE;
    }
 
    return FALSE;
}
 
void
MwPaintNCScrollbars(HWND hwnd, HDC hdc)
{
	BOOL	vertbar = VSCROLLBARVISIBLE(hwnd);
        BOOL	horzbar = HSCROLLBARVISIBLE(hwnd);
	BOOL	fGotDC = FALSE;
	RECT	rc,rc2;
 
	POINT	p3[3];
	int	shrink=2;
 
        int start = 0;
        RECT rcHBar, rcVBar;
 
 
	if (!hdc && (horzbar || vertbar)) {
		hdc = GetWindowDC(hwnd);
		fGotDC = TRUE;
	}
 
	if (horzbar && vertbar) {
		rc.left = hwnd->clirect.right;
		rc.top = hwnd->clirect.bottom;
		rc.right = rc.left + mwSYSMETRICS_CXVSCROLL;
		rc.bottom = rc.top + mwSYSMETRICS_CYHSCROLL;
		FillRect(hdc, &rc, (HBRUSH)(COLOR_BTNFACE+1));
	}
	if (vertbar) {
		rc = hwnd->vscroll.rc;
#if 1
		/* bkgnd */
		rc2.left=rc.left; rc2.right=rc2.left+ mwSYSMETRICS_CXVSCROLL;
		rc2.top=rc.top;
		rc2.bottom=rc2.top+ mwSYSMETRICS_CYHSCROLL;
		FillRect(hdc, &rc2, (HBRUSH)(COLOR_BTNFACE+1));
		rc2.top=rc.bottom- mwSYSMETRICS_CYHSCROLL;
		rc2.bottom=rc2.top+ mwSYSMETRICS_CYHSCROLL;
		FillRect(hdc, &rc2, (HBRUSH)(COLOR_BTNFACE+1));
#endif
		/* up */
		Draw3dUpDownState(hdc, rc.left, rc.top,
			mwSYSMETRICS_CXVSCROLL, mwSYSMETRICS_CYHSCROLL,
			hwnd->vscroll.status & SBS_UPARROW);
		/* down */
		Draw3dUpDownState(hdc, rc.left,rc.bottom-mwSYSMETRICS_CYHSCROLL,
			mwSYSMETRICS_CXVSCROLL, mwSYSMETRICS_CYHSCROLL,
			hwnd->vscroll.status & SBS_DOWNARROW);
/* jmt: draw arrows */
		SelectObject(hdc,GetStockObject(BLACK_BRUSH));
		/* up */
		p3[0].x= rc.left + (mwSYSMETRICS_CXVSCROLL/2) - 1;
		p3[0].y= rc.top + 2 + shrink;
		p3[1].x= rc.left + 2 + shrink - 1;
		p3[1].y= rc.top + (mwSYSMETRICS_CYHSCROLL-4) - shrink;
		p3[2].x= rc.left + (mwSYSMETRICS_CXVSCROLL-4) - shrink;
		p3[2].y= rc.top + (mwSYSMETRICS_CYHSCROLL-4) - shrink;
		Polygon(hdc,p3,3);
		/* down */
		p3[0].x= rc.left + (mwSYSMETRICS_CXVSCROLL/2) - 1;
		p3[0].y= rc.bottom - 4 - shrink;
		p3[1].x= rc.left + 2 + shrink - 1;
		p3[1].y= rc.bottom-mwSYSMETRICS_CYHSCROLL + 2 + shrink;
		p3[2].x= rc.left + (mwSYSMETRICS_CXVSCROLL-4) - shrink;
		p3[2].y= rc.bottom-mwSYSMETRICS_CYHSCROLL + 2 + shrink;
		Polygon(hdc,p3,3);
 
        	/* draw moving bar */
 
    		wndGetVScrollBarRect (hwnd, &rcVBar);
    		rcVBar.left -- ;
    		rcVBar.right -- ;
 
        	start = rcVBar.top + mwSYSMETRICS_CYVSCROLL + hwnd->vscroll.barStart;
 
        	if (start + hwnd->vscroll.barLen > rcVBar.bottom)
            		start = rcVBar.bottom - hwnd->vscroll.barLen;
 
		if (hwnd->vscroll.barLen == 0)
			hwnd->vscroll.barLen=rc.bottom-rc.top-(mwSYSMETRICS_CYVSCROLL*2); 
 
		/* bkgnd */
		rc2.left=rc.left; rc2.right=rc.right/*-1*/;
		rc2.top=rc.top+mwSYSMETRICS_CYHSCROLL;
		rc2.bottom=start;
		if (rc2.bottom>rc2.top)
			FillRect(hdc, &rc2, (HBRUSH)GetStockObject(DKGRAY_BRUSH));   
 
		rc2.top=start+hwnd->vscroll.barLen;
		rc2.bottom=rc.bottom-mwSYSMETRICS_CYHSCROLL;
		if (rc2.bottom>rc2.top)
			FillRect(hdc, &rc2, (HBRUSH)GetStockObject(DKGRAY_BRUSH));   
 
        	Draw3dUpFrame (hdc, rcVBar.left, start, rcVBar.right,
	    		start + hwnd->vscroll.barLen);
		/*printf("barv:(l,t,r,b):(%d,%d,%d,%d)\n",
        		rcVBar.left, start, rcVBar.right,
	    		start + hwnd->vscroll.barLen);*/
	}
	if (horzbar) {
		rc = hwnd->hscroll.rc;
 
#if 1
		/* bkgnd */
		rc2.top=rc.top; rc2.bottom=rc2.top+ mwSYSMETRICS_CYHSCROLL;
		rc2.left=rc.left;
		rc2.right=rc2.left+ mwSYSMETRICS_CXVSCROLL;
		FillRect(hdc, &rc2, (HBRUSH)(COLOR_BTNFACE+1));
		rc2.left=rc.right- mwSYSMETRICS_CXVSCROLL;
		rc2.right=rc2.left+ mwSYSMETRICS_CXVSCROLL;
		FillRect(hdc, &rc2, (HBRUSH)(COLOR_BTNFACE+1));
#endif
 
		/* left */
		Draw3dUpDownState(hdc, rc.left, rc.top,
			mwSYSMETRICS_CXVSCROLL, mwSYSMETRICS_CYHSCROLL,
			hwnd->hscroll.status & SBS_LEFTARROW);
		/* right */
		Draw3dUpDownState(hdc, rc.right-mwSYSMETRICS_CXVSCROLL, rc.top,
			mwSYSMETRICS_CXVSCROLL, mwSYSMETRICS_CYHSCROLL,
			hwnd->hscroll.status & SBS_RIGHTARROW);
/* jmt: draw arrows */
		SelectObject(hdc,GetStockObject(BLACK_BRUSH));
		/* left */
		p3[0].x= rc.left + 2 + shrink;
		p3[0].y= rc.top + (mwSYSMETRICS_CYHSCROLL/2) ;
		p3[1].x= rc.left + (mwSYSMETRICS_CXVSCROLL-4) - shrink ;
		p3[1].y= rc.top + 2 + shrink;
		p3[2].x= rc.left + (mwSYSMETRICS_CXVSCROLL-4) - shrink;
		p3[2].y= rc.bottom - 4 - shrink + 1;
		Polygon(hdc,p3,3);
		/* right */
		p3[0].x= rc.right - 4 - shrink;
		p3[0].y= rc.top + (mwSYSMETRICS_CYHSCROLL/2) ;
		p3[1].x= rc.right-mwSYSMETRICS_CXVSCROLL + 2 + shrink ;
		p3[1].y= rc.top + 2 + shrink;
		p3[2].x= rc.right-mwSYSMETRICS_CXVSCROLL + 2 + shrink;
		p3[2].y= rc.bottom - 4 - shrink + 1;
		Polygon(hdc,p3,3);
 
        	/* draw moving bar. */
 
    		wndGetHScrollBarRect (hwnd, &rcHBar);
    		rcHBar.top -- ;
    		rcHBar.bottom -- ;
 
        	start = rcHBar.left + mwSYSMETRICS_CXHSCROLL + hwnd->hscroll.barStart;
 
        	if (start + hwnd->hscroll.barLen > rcHBar.right)
            		start = rcHBar.right - hwnd->hscroll.barLen;
 
		if (hwnd->hscroll.barLen == 0)
			hwnd->hscroll.barLen=rc.right-rc.left-(mwSYSMETRICS_CXHSCROLL*2); 
 
		/* bkgnd */
		rc2.top=rc.top; rc2.bottom=rc.bottom/*-1*/;
		rc2.left=rc.left+mwSYSMETRICS_CXVSCROLL;
		rc2.right=start;
		if (rc2.right>rc2.left)
			FillRect(hdc, &rc2, (HBRUSH)GetStockObject(DKGRAY_BRUSH));   
 
		rc2.left=start+hwnd->hscroll.barLen;
		rc2.right=rc.right-mwSYSMETRICS_CXVSCROLL;
		if (rc2.right>rc2.left)
			FillRect(hdc, &rc2, (HBRUSH)GetStockObject(DKGRAY_BRUSH));   
 
        	Draw3dUpFrame (hdc, start, rcHBar.top, start + hwnd->hscroll.barLen,
	    		rcHBar.bottom);
		/*printf("barh:(l,t,r,b):(%d,%d,%d,%d)\n",
        		start, rcHBar.top, start + hwnd->hscroll.barLen,
	    		rcHBar.bottom);*/
 
	}
 
	if (fGotDC)
		ReleaseDC(hwnd, hdc);
}
 
/* handle a non-client message for a scrollbar*/
void
MwHandleNCMessageScrollbar(HWND hwnd, UINT msg, WPARAM hitcode, LPARAM lParam)
{
	int	pos = SBS_UNKNOWN;
	BOOL	vertbar = VSCROLLBARVISIBLE(hwnd);
        BOOL	horzbar = HSCROLLBARVISIBLE(hwnd);
	int *	pStat;
	POINT	pt;
	RECT	rc;
 
	static BOOL bDraw;
 
    	static int downPos = SBS_UNKNOWN;
    	static int sbCode;
    	int newThumbPos;
 
	int itemMoveable,itemCount,itemVisible,moveRange;	/* jmt:2k0819 */
	int moveTop,moveBottom,moveLeft,moveRight;	/* jmt:2k0819 */
 
	POINTSTOPOINT(pt, lParam);
	for (;;) {	/* use for() to allow break statement*/
		if (hitcode == HTVSCROLL && vertbar) 
		{
			pStat = &hwnd->vscroll.status;
			rc = hwnd->vscroll.rc;
			rc.bottom = rc.top + mwSYSMETRICS_CYVSCROLL;
			if (PtInRect(&rc, pt)) 
			{
				pos = SBS_UPARROW;
				break;
			}
			rc.bottom = hwnd->vscroll.rc.bottom;
			rc.top = rc.bottom - mwSYSMETRICS_CYVSCROLL;
			if (PtInRect(&rc, pt)) 
			{
				pos = SBS_DOWNARROW;
				break;
			}
			pos = SBS_VERTTHUMB;
		} else if (hitcode == HTHSCROLL && horzbar) 
		{
			pStat = &hwnd->hscroll.status;
			rc = hwnd->hscroll.rc;
			rc.right = rc.left + mwSYSMETRICS_CXHSCROLL;
			if (PtInRect(&rc, pt)) {
				pos = SBS_LEFTARROW;
				break;
			}
			rc.right = hwnd->hscroll.rc.right;
			rc.left = rc.right - mwSYSMETRICS_CXHSCROLL;
			if (PtInRect(&rc, pt)) {
				pos = SBS_RIGHTARROW;
				break;
			}
			pos = SBS_HORZTHUMB;
		} else
			return;
		break;
	}
 
	if (pos == SBS_UNKNOWN)
		return;
 
	*pStat &= ~SBS_MASK;		/* remove stray mouse states*/
 
	if (msg == WM_NCLBUTTONDOWN || msg == WM_NCLBUTTONDBLCLK)	/* jmt:2k0819 */
		*pStat |= pos;
	else *pStat &= ~pos;
 
	if (msg == WM_NCLBUTTONDOWN || msg == WM_NCLBUTTONDBLCLK)	/* jmt:2k0819 */
		bDraw=TRUE;
 
	if (bDraw)
		MwPaintNCScrollbars(hwnd, NULL);
 
        if (pos == SBS_UPARROW || pos == SBS_LEFTARROW)		/* jmt:2k0820 */
	{
                if (hwnd->vscroll.curPos != hwnd->vscroll.minPos)
			sbCode = SB_LINEUP;
        }
        else if (pos == SBS_DOWNARROW || pos == SBS_RIGHTARROW)		/* jmt:2k0820 */
	{
                if (hwnd->vscroll.curPos != hwnd->vscroll.maxPos)
			sbCode = SB_LINEDOWN;
        }
        else if (pos == SBS_VERTTHUMB || pos == SBS_HORZTHUMB)
	{
                sbCode = SB_THUMBTRACK;
        }
 
	switch(msg)
	{
	case WM_NCLBUTTONDOWN:
	case WM_NCLBUTTONDBLCLK:	/* jmt:2k0819 */
	    downPos = pos;
#if MWCLIENT
	    InvalidateRect(hwnd,NULL,TRUE);
#endif
        break;
 
        case WM_NCMOUSEMOVE:	/* jmt:2k0819 */
	    if (hitcode == HTVSCROLL && vertbar) 
	    {
		if (sbCode == SB_THUMBTRACK && downPos == SBS_VERTTHUMB)
	    	{
			/* jmt(2k0819): new algorithm for SB_THUMBTRACK */
 
			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) 
	    {
		if (sbCode == SB_THUMBTRACK && downPos == SBS_HORZTHUMB)
		{
			/* 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;
		}
             }
 
        break;
 
	case WM_NCLBUTTONUP:	/* jmt:2k0819 */
	    bDraw=FALSE;
	    downPos = SBS_UNKNOWN;
 
	    if (sbCode==SB_THUMBTRACK)
	    {
		    if (hitcode == HTVSCROLL && vertbar) 
		    {
			/* jmt(2k0819): new algorithm for SB_THUMBTRACK */
 
			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