BOOL WINAPI
SetScrollRangeEx (HWND hWnd, int iSBar, int iMinPos, int iMaxPos) /* jmt: iSBar not used */
{
PMWSCROLLBARINFO pSBar;
HWND pWin;
RECT rcBar;
DWORD dwStyle; /* jmt:2k0820 */
pWin = (HWND)hWnd;
if ( !(pSBar = wndGetScrollbar (pWin)) )
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;
}
dwStyle = (GetWindowStyle (hWnd) & SBS_TYPEMASK); /* jmt: 2k0820 */
if (dwStyle == SBS_VERT)
{
wndGetVScrollbarRect (pWin, &rcBar);
rcBar.left --;
rcBar.right --;
}
else
{
wndGetHScrollbarRect (pWin, &rcBar);
rcBar.top --;
rcBar.bottom --;
}
wndScrollbarPos (pWin, dwStyle == SBS_HORZ, &rcBar);
#if 0
SendMessage (hWnd, WM_NCPAINT, 0, (LPARAM)(&rcBar));
#else
MwPaintScrollbars(hWnd,NULL,dwStyle); /* a must */
#endif
return TRUE;
}
BOOL SetScrollPosEx (HWND hWnd, int iSBar, int iNewPos) /* jmt: iSBar not used */
{
PMWSCROLLBARINFO pSBar;
HWND pWin;
RECT rcBar;
DWORD dwStyle; /* jmt:2k0820 */
pWin = (HWND)hWnd;
if ( !(pSBar = wndGetScrollBar (pWin)) )
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;
}
dwStyle = (GetWindowStyle (hWnd) & SBS_TYPEMASK); /* jmt: 2k0820 */
if (dwStyle == SBS_VERT)
{
wndGetVScrollBarRect (pWin, &rcBar);
rcBar.left --;
rcBar.right --;
}
else
{
wndGetHScrollBarRect (pWin, &rcBar);
rcBar.top --;
rcBar.bottom --;
}
wndScrollBarPos (pWin, dwStyle == SBS_HORZ, &rcBar);
#if 0
SendMessage (hWnd, WM_NCPAINT, 0, (LPARAM)(&rcBar));
#else
MwPaintScrollbars(hWnd,NULL,dwStyle); /* a must */
#endif
return TRUE;
}
BOOL WINAPI
EnableScrollBarEx (HWND hWnd, int iSBar, BOOL bEnable) /* jmt: iSBar not used */
{
PMWSCROLLBARINFO pSBar;
HWND pWin;
BOOL bPrevState;
RECT rcBar;
DWORD dwStyle; /* jmt:2k0820 */
pWin = (HWND)hWnd;
if ( !(pSBar = wndGetScrollbar (pWin)) )
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;
dwStyle = (GetWindowStyle (hWnd) & SBS_TYPEMASK); /* jmt: 2k0820 */
if (dwStyle == SBS_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
MwPaintScrollbars(hWnd,NULL,dwStyle); /* a must */
#endif
return TRUE;
}
static LRESULT CALLBACK
ScrollbarControlProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) /* jmt:2k0820 */
{
DWORD dwStyle;
MWSCROLLBARINFO* pData;
int moveRange;
RECT rcBar;
dwStyle = (GetWindowStyle (hwnd) & SBS_TYPEMASK);
switch (message)
{
case WM_CREATE:
if (!(pData = malloc (sizeof (MWSCROLLBARINFO))))
{
fprintf(stderr, "Create scroll bar control failure!\n");
return -1;
}
pData->minPos=0; /* min value of scroll range.*/
/* max value of scroll range.*/
pData->maxPos=0;
if (dwStyle==SBS_VERT)
moveRange=((hwnd->winrect.bottom-hwnd->winrect.top)
-((hwnd->winrect.right-hwnd->winrect.left)<<1));
else
moveRange=((hwnd->winrect.right-hwnd->winrect.left)
-((hwnd->winrect.bottom-hwnd->winrect.top)<<1));
if (moveRange > MWM_MINBARLEN)
{
pData->maxPos=moveRange / MWM_MINBARLEN;
if( (moveRange % MWM_MINBARLEN) )
pData->maxPos++;
}
printf("maxPos=%d\n",pData->maxPos);
pData->curPos=0; /* current scroll pos.*/
/* steps per page.*/
pData->pageStep=1;
if ( (pData->maxPos - 2) > 1)
pData->pageStep = pData->maxPos - 2;
printf("pageStep=%d\n",pData->pageStep);
pData->barStart=0; /* start pixel of bar.*/
pData->barLen=MWM_MINBARLEN; /* length of bar.*/
pData->status=SBS_UNKNOWN; /* status of scroll bar.*/
#if 0 /* jmt: must handle WM_MOVE */
pData->rc=hwnd->winrect; /* screen coordinates position*/
#endif
hwnd->userdata = (DWORD)pData;
if (dwStyle == SBS_VERT)
{
wndGetVScrollBarRect (hwnd, &rcBar);
rcBar.left --;
rcBar.right --;
}
else
{
wndGetHScrollBarRect (hwnd, &rcBar);
rcBar.top --;
rcBar.bottom --;
}
/* adjust pData->barLen */
wndScrollBarPos (hwnd, dwStyle == SBS_HORZ, &rcBar);
break;
case WM_DESTROY:
free ((void *)(hwnd->userdata));
break;
case WM_PAINT:
MwPaintScrollbars(hwnd,NULL,dwStyle);
break;
case WM_NCLBUTTONDOWN:
case WM_NCLBUTTONDBLCLK:
case WM_NCMOUSEMOVE:
case WM_NCLBUTTONUP:
MwHandleMessageScrollbar(hwnd, wParam, lParam, message, dwStyle);
break;
case WM_HSCROLL:
case WM_VSCROLL:
{
int newTop,itemCount,itemVisibles;
pData = (MWSCROLLBARINFO *)hwnd->userdata;
newTop = pData->curPos;
itemCount = pData->maxPos - pData->minPos + 1;
itemVisibles = pData->pageStep;
switch(wParam)
{
case SB_LINEDOWN:
#define ITEM_BOTTOM(x) (x->curPos + itemVisibles - 1)
if (ITEM_BOTTOM (pData) < (itemCount - 1 ))
{
newTop ++;
}
break;
case SB_LINEUP:
if (pData->curPos > 0)
{
newTop --;
}
break;
case SB_PAGEDOWN:
if ((pData->curPos + (itemVisibles << 1)) <=
itemCount)
newTop += itemVisibles;
else
newTop = itemCount - itemVisibles;
if (newTop < 0)
return 0;
break;
case SB_PAGEUP:
if (pData->curPos >= itemVisibles)
newTop -= itemVisibles;
else
newTop = 0;
break;
case SB_THUMBTRACK:
newTop = (int)lParam;
break;
}
pData->curPos = newTop;
SendMessage (hwnd, WM_PAINT, 0, 0);
sbSetScrollInfo (hwnd, pData, TRUE);
return 0;
}
break;
default:
return DefWindowProc (hwnd, message, wParam, lParam);
}
return 0;
}
BOOL SetScrollInfoEx (HWND hWnd, int iSBar,
LPCSCROLLINFO lpsi, BOOL fRedraw) /* jmt: iSBar not used */
{
PMWSCROLLBARINFO pSBar;
HWND pWin;
RECT rcBar;
DWORD dwStyle; /* jmt:2k0820 */
pWin = (HWND)hWnd;
if ( !(pSBar = wndGetScrollBar (pWin)) )
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;
}
dwStyle = (GetWindowStyle (hWnd) & SBS_TYPEMASK); /* jmt: 2k0820 */
if(fRedraw)
{
if (dwStyle == SBS_VERT)
{
wndGetVScrollBarRect (pWin, &rcBar);
rcBar.left --;
rcBar.right --;
}
else
{
wndGetHScrollBarRect (pWin, &rcBar);
rcBar.top --;
rcBar.bottom --;
}
wndScrollBarPos (pWin, dwStyle == SBS_HORZ, &rcBar);
#if 0
SendMessage (hWnd, WM_NCPAINT, 0, (LPARAM)(&rcBar));
#else
MwPaintScrollbars(hWnd,NULL,dwStyle); /* a must */
#endif
}
return TRUE;
}
/* handle a non-client message for a scrollbar*/
void
MwHandleMessageScrollbar(HWND hwnd, WPARAM hitcode, LPARAM lParam, UINT msg, DWORD style)
{
int pos = SBS_UNKNOWN;
BOOL vertbar = (style==SBS_VERT);
BOOL horzbar = (style==SBS_HORZ);
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 */
int cx,cy;
MWSCROLLBARINFO* pData;
pData = (MWSCROLLBARINFO *)hwnd->userdata;
rc = hwnd->winrect;
cx=rc.right-rc.left;
cy=rc.bottom-rc.top;
POINTSTOPOINT(pt, lParam);
for (;;) { /* use for() to allow break statement*/
if (vertbar)
{
pStat = &pData->status;
rc = hwnd->winrect;
rc.bottom = rc.top + cx;
if (PtInRect(&rc, pt))
{
pos = SBS_UPARROW;
break;
}
rc.bottom = hwnd->winrect.bottom;
rc.top = rc.bottom - cx;
if (PtInRect(&rc, pt))
{
pos = SBS_DOWNARROW;
break;
}
pos = SBS_VERTTHUMB;
} else if (horzbar)
{
pStat = &pData->status;
rc = hwnd->winrect;
rc.right = rc.left + cy;
if (PtInRect(&rc, pt)) {
pos = SBS_LEFTARROW;
break;
}
rc.right = hwnd->winrect.right;
rc.left = rc.right - cy;
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)
*pStat |= pos;
else *pStat &= ~pos;
if (msg == WM_NCLBUTTONDOWN || msg == WM_NCLBUTTONDBLCLK)
bDraw=TRUE;
if (bDraw)
MwPaintScrollbars(hwnd, NULL,style);
if (pos == SBS_UPARROW || pos == SBS_LEFTARROW) /* jmt:2k0820 */
{
if (pData->curPos != pData->minPos)
sbCode = SB_LINEUP;
}
else if (pos == SBS_DOWNARROW || pos == SBS_RIGHTARROW) /* jmt:2k0820 */
{
if (pData->curPos != pData->maxPos)
sbCode = SB_LINEDOWN;
}
else if (pos == SBS_VERTTHUMB || pos == SBS_HORZTHUMB)
{
sbCode = SB_THUMBTRACK;
}
switch(msg)
{
case WM_NCLBUTTONDOWN:
case WM_NCLBUTTONDBLCLK:
downPos = pos;
break;
case WM_NCMOUSEMOVE:
if (vertbar)
{
if (sbCode == SB_THUMBTRACK && downPos == SBS_VERTTHUMB)
{
/* jmt(2k0819): new algorithm for SB_THUMBTRACK */
rc = hwnd->winrect;
moveTop = rc.top + cx;
moveBottom = hwnd->winrect.bottom - cx;
moveRange = moveBottom - moveTop;
itemCount = pData->maxPos - pData->minPos + 1;
itemVisible = pData->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 >= pData->minPos &&
newThumbPos <= pData->maxPos)
{
SendMessage (hwnd,
WM_VSCROLL, SB_THUMBTRACK, newThumbPos);
SendMessage (GetParent(hwnd),
WM_VSCROLL, SB_THUMBTRACK, newThumbPos);
}
break;
}
}
if (horzbar)
{
if (sbCode == SB_THUMBTRACK && downPos == SBS_HORZTHUMB)
{
/* jmt(2k0819): new algorithm for SB_THUMBTRACK */
rc = hwnd->winrect;
moveLeft = rc.left + cy;
moveRight = hwnd->winrect.right - cy;
moveRange = moveRight - moveLeft;
itemCount = pData->maxPos - pData->minPos + 1;
itemVisible = pData->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 >= pData->minPos &&
newThumbPos <= pData->maxPos)
{
SendMessage (hwnd,
WM_HSCROLL, SB_THUMBTRACK, newThumbPos);
SendMessage (GetParent(hwnd),
WM_HSCROLL, SB_THUMBTRACK, newThumbPos);
}
break;
}
}
break;
case WM_NCLBUTTONUP:
bDraw=FALSE;
downPos = SBS_UNKNOWN;
if (sbCode==SB_THUMBTRACK)
{
if (vertbar)
{
/* jmt(2k0819): new algorithm for SB_THUMBTRACK */
rc = hwnd->winrect;
moveTop = rc.top + cx;
moveBottom = hwnd->winrect.bottom - cx;
moveRange = moveBottom - moveTop;
itemCount = pData->maxPos - pData->minPos + 1;
itemVisible = pData->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 >= pData->minPos &&
newThumbPos <= pData->maxPos)
{
SendMessage (hwnd,
WM_VSCROLL, SB_THUMBTRACK, newThumbPos);
SendMessage (GetParent(hwnd),
WM_VSCROLL, SB_THUMBTRACK, newThumbPos);
}
break; /* case */
}
if (horzbar)
{
/* jmt(2k0819): new algorithm for SB_THUMBTRACK */
rc = hwnd->winrect;
moveLeft = rc.left + cy;
moveRight = hwnd->winrect.right - cy;
moveRange = moveRight - moveLeft;
itemCount = pData->maxPos - pData->minPos + 1;
itemVisible = pData->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 >= pData->minPos &&
newThumbPos <= pData->maxPos)
{
SendMessage (hwnd,
WM_HSCROLL, SB_THUMBTRACK, newThumbPos);
SendMessage (GetParent(hwnd),
WM_HSCROLL, SB_THUMBTRACK, newThumbPos);
}
break; /* case */
}
}
else
{
if (vertbar)
{
SendMessage (hwnd, WM_VSCROLL, sbCode, 0);
SendMessage (GetParent(hwnd), WM_VSCROLL, sbCode, 0);
}
if (horzbar)
{
SendMessage (hwnd, WM_HSCROLL, sbCode, 0);
SendMessage (GetParent(hwnd), WM_HSCROLL, sbCode, 0);
}
}
break;
}
}