trackbar.c

winNT技术操作系统,国外开放的原代码和LIUX一样

        DrawEdge (hdc, &rcChannel, EDGE_SUNKEN, BF_RECT | BF_ADJUST);
        if (dwStyle & TBS_ENABLESELRANGE) {		 /* fill the channel */
            FillRect (hdc, &rcChannel, GetStockObject(WHITE_BRUSH));
            if (TRACKBAR_HasSelection(infoPtr))
                FillRect (hdc, &infoPtr->rcSelection, GetSysColorBrush(COLOR_HIGHLIGHT));
        }
    }
}

static void
TRACKBAR_DrawOneTic (TRACKBAR_INFO *infoPtr, HDC hdc, LONG ticPos, int flags)
{
    int x, y, ox, oy, range, side, indent = 0, len = 3;
    int offsetthumb;
    RECT rcTics;

    if (flags & TBS_VERT) {
        offsetthumb = (infoPtr->rcThumb.bottom - infoPtr->rcThumb.top)/2;
	rcTics.left = infoPtr->rcThumb.left - 2;
	rcTics.right = infoPtr->rcThumb.right + 2;
	rcTics.top    = infoPtr->rcChannel.top + offsetthumb + 1;
	rcTics.bottom = infoPtr->rcChannel.bottom - offsetthumb;
    } else {
        offsetthumb = (infoPtr->rcThumb.right - infoPtr->rcThumb.left)/2;
	rcTics.left   = infoPtr->rcChannel.left + offsetthumb + 1;
	rcTics.right  = infoPtr->rcChannel.right - offsetthumb;
	rcTics.top = infoPtr->rcThumb.top - 2;
	rcTics.bottom = infoPtr->rcThumb.bottom + 2;
    }

    if (flags & (TBS_TOP | TBS_LEFT)) {
	x = rcTics.left;
	y = rcTics.top;
	side = -1;
    } else {
  	x = rcTics.right;
  	y = rcTics.bottom;
	side = 1;
    }

    range = infoPtr->lRangeMax - infoPtr->lRangeMin;
    if (range <= 0)
      range = 1; /* to avoid division by zero */

    if (flags & TIC_SELECTIONMARK) {
  	indent = (flags & TIC_SELECTIONMARKMIN) ? -1 : 1;
    } else if (flags & TIC_EDGE) {
	len++;
    }

    if (flags & TBS_VERT) {
	int height = rcTics.bottom - rcTics.top;
	y = rcTics.top + (height*(ticPos - infoPtr->lRangeMin))/range;
    } else {
        int width = rcTics.right - rcTics.left;
        x = rcTics.left + (width*(ticPos - infoPtr->lRangeMin))/range;
    }

    ox = x;
    oy = y;
    MoveToEx(hdc, x, y, 0);
    if (flags & TBS_VERT) x += len * side;
    else y += len * side;
    LineTo(hdc, x, y);
	    
    if (flags & TIC_SELECTIONMARK) {
	if (flags & TBS_VERT) {
	    x -= side;
	} else {
	    y -= side;
	}
	MoveToEx(hdc, x, y, 0);
	if (flags & TBS_VERT) {
	    y += 2 * indent;
	} else {
	    x += 2 * indent;
	}
	
	LineTo(hdc, x, y);
	LineTo(hdc, ox, oy);
    }
}


static inline void
TRACKBAR_DrawTic (TRACKBAR_INFO *infoPtr, HDC hdc, LONG ticPos, int flags)
{
    if ((flags & (TBS_LEFT | TBS_TOP)) || (flags & TBS_BOTH))
        TRACKBAR_DrawOneTic (infoPtr, hdc, ticPos, flags | TBS_LEFT);

    if (!(flags & (TBS_LEFT | TBS_TOP)) || (flags & TBS_BOTH))
        TRACKBAR_DrawOneTic (infoPtr, hdc, ticPos, flags & ~TBS_LEFT);
}

static void
TRACKBAR_DrawTics (TRACKBAR_INFO *infoPtr, HDC hdc, DWORD dwStyle)
{
    unsigned int i;
    int ticFlags = dwStyle & 0x0f;
    LOGPEN ticPen = { PS_SOLID, {1, 0}, GetSysColor (COLOR_3DDKSHADOW) };
    HPEN hOldPen, hTicPen;
    HTHEME theme = GetWindowTheme (infoPtr->hwndSelf);
    
    if (theme)
    {
        int part = (dwStyle & TBS_VERT) ? TKP_TICSVERT : TKP_TICS;
        GetThemeColor (theme, part, TSS_NORMAL, TMT_COLOR, &ticPen.lopnColor);
    }
    /* create the pen to draw the tics with */
    hTicPen = CreatePenIndirect(&ticPen);
    hOldPen = hTicPen ? SelectObject(hdc, hTicPen) : 0;

    /* actually draw the tics */
    for (i=0; i<infoPtr->uNumTics; i++)
        TRACKBAR_DrawTic (infoPtr, hdc, infoPtr->tics[i], ticFlags);

    TRACKBAR_DrawTic (infoPtr, hdc, infoPtr->lRangeMin, ticFlags | TIC_EDGE);
    TRACKBAR_DrawTic (infoPtr, hdc, infoPtr->lRangeMax, ticFlags | TIC_EDGE);

    if ((dwStyle & TBS_ENABLESELRANGE) && TRACKBAR_HasSelection(infoPtr)) {
        TRACKBAR_DrawTic (infoPtr, hdc, infoPtr->lSelMin,
                          ticFlags | TIC_SELECTIONMARKMIN);
        TRACKBAR_DrawTic (infoPtr, hdc, infoPtr->lSelMax,
                          ticFlags | TIC_SELECTIONMARKMAX);
    }
    
    /* clean up the pen, if we created one */
    if (hTicPen) {
	SelectObject(hdc, hOldPen);
	DeleteObject(hTicPen);
    }
}

static void
TRACKBAR_DrawThumb(TRACKBAR_INFO *infoPtr, HDC hdc, DWORD dwStyle)
{
    HBRUSH oldbr;
    HPEN  oldpen;
    RECT thumb = infoPtr->rcThumb;
    int BlackUntil = 3;
    int PointCount = 6;
    POINT points[6];
    int fillClr;
    int PointDepth;
    HTHEME theme = GetWindowTheme (infoPtr->hwndSelf);
    
    if (theme)
    {
        int partId;
        int stateId;
        if (dwStyle & TBS_BOTH)
            partId = (dwStyle & TBS_VERT) ? TKP_THUMBVERT : TKP_THUMB;
        else if (dwStyle & TBS_LEFT)
            partId = (dwStyle & TBS_VERT) ? TKP_THUMBLEFT : TKP_THUMBTOP;
        else
            partId = (dwStyle & TBS_VERT) ? TKP_THUMBRIGHT : TKP_THUMBBOTTOM;
            
        if (dwStyle & WS_DISABLED)
            stateId = TUS_DISABLED;
        else if (infoPtr->flags & TB_DRAG_MODE)
            stateId = TUS_PRESSED;
        else if (infoPtr->flags & TB_THUMB_HOT)
            stateId = TUS_HOT;
        else
            stateId = TUS_NORMAL;
        
        DrawThemeBackground (theme, hdc, partId, stateId, &thumb, 0);
        
        return;
    }

    fillClr = infoPtr->flags & TB_DRAG_MODE ? COLOR_BTNHILIGHT : COLOR_BTNFACE;
    oldbr = SelectObject (hdc, GetSysColorBrush(fillClr));
    SetPolyFillMode (hdc, WINDING);

    if (dwStyle & TBS_BOTH)
    {
       points[0].x=thumb.right;
       points[0].y=thumb.top;
       points[1].x=thumb.right;
       points[1].y=thumb.bottom;
       points[2].x=thumb.left;
       points[2].y=thumb.bottom;
       points[3].x=thumb.left;
       points[3].y=thumb.top;
       points[4].x=points[0].x;
       points[4].y=points[0].y;
       PointCount = 5;
       BlackUntil = 3;
    }
    else
    {
        if (dwStyle & TBS_VERT)
        {
          PointDepth = (thumb.bottom - thumb.top) / 2;
          if (dwStyle & TBS_LEFT)
          {
            points[0].x=thumb.right;
            points[0].y=thumb.top;
            points[1].x=thumb.right;
            points[1].y=thumb.bottom;
            points[2].x=thumb.left + PointDepth;
            points[2].y=thumb.bottom;
            points[3].x=thumb.left;
            points[3].y=(thumb.bottom - thumb.top) / 2 + thumb.top + 1;
            points[4].x=thumb.left + PointDepth;
            points[4].y=thumb.top;
            points[5].x=points[0].x;
            points[5].y=points[0].y;
            BlackUntil = 4;
          }
          else
          {
            points[0].x=thumb.right;
            points[0].y=(thumb.bottom - thumb.top) / 2 + thumb.top + 1;
            points[1].x=thumb.right - PointDepth;
            points[1].y=thumb.bottom;
            points[2].x=thumb.left;
            points[2].y=thumb.bottom;
            points[3].x=thumb.left;
            points[3].y=thumb.top;
            points[4].x=thumb.right - PointDepth;
            points[4].y=thumb.top;
            points[5].x=points[0].x;
            points[5].y=points[0].y;
          }
        }
        else
        {
          PointDepth = (thumb.right - thumb.left) / 2;
          if (dwStyle & TBS_TOP)
          {
            points[0].x=(thumb.right - thumb.left) / 2 + thumb.left + 1;
            points[0].y=thumb.top;
            points[1].x=thumb.right;
            points[1].y=thumb.top + PointDepth;
            points[2].x=thumb.right;
            points[2].y=thumb.bottom;
            points[3].x=thumb.left;
            points[3].y=thumb.bottom;
            points[4].x=thumb.left;
            points[4].y=thumb.top + PointDepth;
            points[5].x=points[0].x;
            points[5].y=points[0].y;
            BlackUntil = 4;
          }
          else
          {
            points[0].x=thumb.right;
            points[0].y=thumb.top;
            points[1].x=thumb.right;
            points[1].y=thumb.bottom - PointDepth;
            points[2].x=(thumb.right - thumb.left) / 2 + thumb.left + 1;
            points[2].y=thumb.bottom;
            points[3].x=thumb.left;
            points[3].y=thumb.bottom - PointDepth;
            points[4].x=thumb.left;
            points[4].y=thumb.top;
            points[5].x=points[0].x;
            points[5].y=points[0].y;
          }
        }

    }

    /* Draw the thumb now */
    Polygon (hdc, points, PointCount);
    oldpen = SelectObject(hdc, GetStockObject(BLACK_PEN));
    Polyline(hdc,points, BlackUntil);
    SelectObject(hdc, GetStockObject(WHITE_PEN));
    Polyline(hdc, &points[BlackUntil-1], PointCount+1-BlackUntil);
    SelectObject(hdc, oldpen);
    SelectObject(hdc, oldbr);
}


inline static void
TRACKBAR_ActivateToolTip (TRACKBAR_INFO *infoPtr, BOOL fShow)
{
    TTTOOLINFOW ti;

    if (!infoPtr->hwndToolTip) return;

    ZeroMemory(&ti, sizeof(ti));
    ti.cbSize = sizeof(ti);
    ti.hwnd   = infoPtr->hwndSelf;

    SendMessageW (infoPtr->hwndToolTip, TTM_TRACKACTIVATE, fShow, (LPARAM)&ti);
}


static void
TRACKBAR_UpdateToolTip (TRACKBAR_INFO *infoPtr)
{
    DWORD dwStyle = GetWindowLongW (infoPtr->hwndSelf, GWL_STYLE);
    WCHAR buf[80];
    static const WCHAR fmt[] = { '%', 'l', 'd', 0 };
    TTTOOLINFOW ti;
    POINT pt;
    RECT rcClient;
    LRESULT size;

    if (!infoPtr->hwndToolTip) return;

    ZeroMemory(&ti, sizeof(ti));
    ti.cbSize = sizeof(ti);
    ti.hwnd   = infoPtr->hwndSelf;
    ti.uFlags = TTF_IDISHWND | TTF_TRACK | TTF_ABSOLUTE;

    wsprintfW (buf, fmt, infoPtr->lPos);
    ti.lpszText = buf;
    SendMessageW (infoPtr->hwndToolTip, TTM_UPDATETIPTEXTW, 0, (LPARAM)&ti);

    GetClientRect (infoPtr->hwndSelf, &rcClient);
    size = SendMessageW (infoPtr->hwndToolTip, TTM_GETBUBBLESIZE, 0, (LPARAM)&ti);
    if (dwStyle & TBS_VERT) {
	if (infoPtr->fLocation == TBTS_LEFT)
	    pt.x = 0 - LOWORD(size) - TOOLTIP_OFFSET;
	else
	    pt.x = rcClient.right + TOOLTIP_OFFSET;
    	pt.y = (infoPtr->rcThumb.top + infoPtr->rcThumb.bottom - HIWORD(size))/2;
    } else {
	if (infoPtr->fLocation == TBTS_TOP)
	    pt.y = 0 - HIWORD(size) - TOOLTIP_OFFSET;
	else
            pt.y = rcClient.bottom + TOOLTIP_OFFSET;
        pt.x = (infoPtr->rcThumb.left + infoPtr->rcThumb.right - LOWORD(size))/2;
    }
    ClientToScreen(infoPtr->hwndSelf, &pt);

    SendMessageW (infoPtr->hwndToolTip, TTM_TRACKPOSITION,
                  0, (LPARAM)MAKELPARAM(pt.x, pt.y));
}


static void
TRACKBAR_Refresh (TRACKBAR_INFO *infoPtr, HDC hdcDst)
{
    DWORD dwStyle = GetWindowLongW (infoPtr->hwndSelf, GWL_STYLE);
    RECT rcClient;
    HDC hdc;
    HBITMAP hOldBmp = 0, hOffScreenBmp = 0;
    NMCUSTOMDRAW nmcd;
    int gcdrf, icdrf;

    if (infoPtr->flags & TB_THUMBCHANGED) {
        TRACKBAR_UpdateThumb (infoPtr);
        if (infoPtr->flags & TB_THUMBSIZECHANGED)
            TRACKBAR_CalcChannel (infoPtr);
    }
    if (infoPtr->flags & TB_SELECTIONCHANGED)
        TRACKBAR_CalcSelection (infoPtr);

    if (infoPtr->flags & TB_DRAG_MODE)
        TRACKBAR_UpdateToolTip (infoPtr);

    infoPtr->flags &= ~ (TB_THUMBCHANGED | TB_SELECTIONCHANGED);

    GetClientRect (infoPtr->hwndSelf, &rcClient);
    
    /* try to render offscreen, if we fail, carrry onscreen */
    hdc = CreateCompatibleDC(hdcDst);
    if (hdc) {
        hOffScreenBmp = CreateCompatibleBitmap(hdcDst, rcClient.right, rcClient.bottom);
        if (hOffScreenBmp) {
	    hOldBmp = SelectObject(hdc, hOffScreenBmp);
	} else {
	    DeleteObject(hdc);
	    hdc = hdcDst;
	}
    } else {
	hdc = hdcDst;
    }

    ZeroMemory(&nmcd, sizeof(nmcd));
    nmcd.hdr.hwndFrom = infoPtr->hwndSelf;
    nmcd.hdr.idFrom = GetWindowLongPtrW (infoPtr->hwndSelf, GWLP_ID);
    nmcd.hdr.code = NM_CUSTOMDRAW;
    nmcd.hdc = hdc;

    /* start the paint cycle */
    nmcd.rc = rcClient;
    gcdrf = notify_customdraw(infoPtr, &nmcd, CDDS_PREPAINT);
    if (gcdrf & CDRF_SKIPDEFAULT) goto cleanup;
    
    /* Erase backbround */
    if (gcdrf == CDRF_DODEFAULT ||
        notify_customdraw(infoPtr, &nmcd, CDDS_PREERASE) != CDRF_SKIPDEFAULT) {
        if (GetWindowTheme (infoPtr->hwndSelf))
            DrawThemeParentBackground (infoPtr->hwndSelf, hdc, &rcClient);
        else
	    FillRect (hdc, &rcClient, GetSysColorBrush(COLOR_BTNFACE));
        if (gcdrf != CDRF_DODEFAULT)
	    notify_customdraw(infoPtr, &nmcd, CDDS_POSTERASE);
    }
    
    /* draw channel */
    if (gcdrf & CDRF_NOTIFYITEMDRAW) {
        nmcd.dwItemSpec = TBCD_CHANNEL;
	nmcd.uItemState = CDIS_DEFAULT;
	nmcd.rc = infoPtr->rcChannel;
	icdrf = notify_customdraw(infoPtr, &nmcd, CDDS_ITEMPREPAINT);
    } else icdrf = CDRF_DODEFAULT;
    if ( !(icdrf & CDRF_SKIPDEFAULT) ) {
	TRACKBAR_DrawChannel (infoPtr, hdc, dwStyle);
	if (icdrf & CDRF_NOTIFYPOSTPAINT)
	    notify_customdraw(infoPtr, &nmcd, CDDS_ITEMPOSTPAINT);
    }


    /* draw tics */
    if (!(dwStyle & TBS_NOTICKS)) {
    	if (gcdrf & CDRF_NOTIFYITEMDRAW) {
            nmcd.dwItemSpec = TBCD_TICS;
	    nmcd.uItemState = CDIS_DEFAULT;
	    nmcd.rc = rcClient;
	    icdrf = notify_customdraw(infoPtr, &nmcd, CDDS_ITEMPREPAINT);
        } else icdrf = CDRF_DODEFAULT;
	if ( !(icdrf & CDRF_SKIPDEFAULT) ) {
	    TRACKBAR_DrawTics (infoPtr, hdc, dwStyle);
	    if (icdrf & CDRF_NOTIFYPOSTPAINT)
		notify_customdraw(infoPtr, &nmcd, CDDS_ITEMPOSTPAINT);
	}
    }
    
    /* draw thumb */
    if (!(dwStyle & TBS_NOTHUMB)) {
	if (gcdrf & CDRF_NOTIFYITEMDRAW) {
	    nmcd.dwItemSpec = TBCD_THUMB;
	    nmcd.uItemState = infoPtr->flags & TB_DRAG_MODE ? CDIS_HOT : CDIS_DEFAULT;
	    nmcd.rc = infoPtr->rcThumb;
	    icdrf = notify_customdraw(infoPtr, &nmcd, CDDS_ITEMPREPAINT);
	} else icdrf = CDRF_DODEFAULT;
	if ( !(icdrf & CDRF_SKIPDEFAULT) ) {
            TRACKBAR_DrawThumb(infoPtr, hdc, dwStyle);
	    if (icdrf & CDRF_NOTIFYPOSTPAINT)
		notify_customdraw(infoPtr, &nmcd, CDDS_ITEMPOSTPAINT);
	}
    }

    /* draw focus rectangle */
    if (infoPtr->bFocussed) {
	DrawFocusRect(hdc, &rcClient);
    }

    /* finish up the painting */
    if (gcdrf & CDRF_NOTIFYPOSTPAINT)
	notify_customdraw(infoPtr, &nmcd, CDDS_POSTPAINT);
    
cleanup:
    /* cleanup, if we rendered offscreen */
    if (hdc != hdcDst) {
	BitBlt(hdcDst, 0, 0, rcClient.right, rcClient.bottom, hdc, 0, 0, SRCCOPY);
	SelectObject(hdc, hOldBmp);
	DeleteObject(hOffScreenBmp);
	DeleteObject(hdc);
    }
}


static void
TRACKBAR_AlignBuddies (TRACKBAR_INFO *infoPtr)
{
    DWORD dwStyle = GetWindowLongW (infoPtr->hwndSelf, GWL_STYLE);
    HWND hwndParent = GetParent (infoPtr->hwndSelf);
    RECT rcSelf, rcBuddy;
    INT x, y;

    GetWindowRect (infoPtr->hwndSelf, &rcSelf);
    MapWindowPoints (HWND_DESKTOP, hwndParent, (LPPOINT)&rcSelf, 2);

    /* align buddy left or above */
    if (infoPtr->hwndBuddyLA) {
	GetWindowRect (infoPtr->hwndBuddyLA, &rcBuddy);
	MapWindowPoints (HWND_DESKTOP, hwndParent, (LPPOINT)&rcBuddy, 2);

	if (dwStyle & TBS_VERT) {
	    x = (infoPtr->rcChannel.right + infoPtr->rcChannel.left) / 2 -
		(rcBuddy.right - rcBuddy.left) / 2 + rcSelf.left;
	    y = rcSelf.top - (rcBuddy.bottom - rcBuddy.top);
	}
	else {
	    x = rcSelf.left - (rcBuddy.right - rcBuddy.left);