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/*

 * Copyright (c) 2000 Greg Haerr 

 * Portions Copyright (c) 1999, 2000, Wei Yongming.

 * jmt: scrollbar thumb ported

 *

 * Microwindows win32 NonClient Scrollbars

 */

#define MWINCLUDECOLORS//jmt: for color macros

#include "windows.h"

#include "wintern.h"

#include "wintools.h"

#include 

#include 

#include //printf

/* 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)

//#

/****************************** Drawing Helpers *******************************/

static void

Draw3DUpFrame(HDC hDC, int l, int t, int r, int b)

{

        RECT    rc;

        HBRUSH  hbr;

        SetRect(&rc, l, t, r, b);

        Draw3dBox(hDC, rc.left, rc.top,

                rc.right-rc.left, rc.bottom-rc.top,

                GetSysColor(COLOR_3DLIGHT),

                GetSysColor(COLOR_WINDOWFRAME));

        InflateRect(&rc, -1, -1);

        Draw3dBox(hDC, rc.left, rc.top,

                rc.right-rc.left, rc.bottom-rc.top,

                GetSysColor(COLOR_BTNHIGHLIGHT),

                GetSysColor(COLOR_BTNSHADOW));

        InflateRect(&rc, -1, -1);

        hbr = CreateSolidBrush(LTGRAY);

        FillRect(hDC, &rc, hbr);

        DeleteObject(hbr);

}

/*

 * 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;

                /* bkgnd */

                FillRect(hdc, &rc, (HBRUSH)(COLOR_BTNFACE+1));

                /* 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);

#if 1//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);

#endif

#if 1

                // 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);

#if 0

                printf("barv:(l,t,r,b):(%d,%d,%d,%d)\n",

                        rcVBar.left, start, rcVBar.right,

                        start + hwnd->vscroll.barLen);

#endif

#endif

        }

        if (horzbar) {

                rc = hwnd->hscroll.rc;

                /* bkgnd */

                FillRect(hdc, &rc, (HBRUSH)(COLOR_BTNFACE+1));

                /* 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);

#if 1//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);

#endif

#if 1

                // 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);

#if 0

                printf("barh:(l,t,r,b):(%d,%d,%d,%d)\n",

                        start, rcHBar.top, start + hwnd->hscroll.barLen,

                        rcHBar.bottom);

#endif

#endif

        }

        if (fGotDC)

                ReleaseDC(hwnd, hdc);

}

/* handle a non-client message for a scrollbar*/

void

MwHandleNCMessageScrollbar(HWND hwnd, WPARAM hitcode, LPARAM lParam, UINT msg/*BOOL fDown*/)

{

        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;

        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)) )//ok

        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)//ok

{

    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)//ok

{

    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;

}