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 * Scrollbar control
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 *
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 * Copyright 1993 Martin Ayotte
 * Copyright 1994, 1996 Alexandre Julliard
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 */

#include "wine/winuser16.h"
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#include "win.h"
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WINE_DEFAULT_DEBUG_CHANNEL(scroll);
    INT   curVal;   /* Current scroll-bar value */
    INT   minVal;   /* Minimum scroll-bar value */
    INT   maxVal;   /* Maximum scroll-bar value */
    INT   page;     /* Page size of scroll bar (Win32) */
    UINT  flags;    /* EnableScrollBar flags */
} SCROLLBAR_INFO, *LPSCROLLBAR_INFO;


static HBITMAP hUpArrow;
static HBITMAP hDnArrow;
static HBITMAP hLfArrow;
static HBITMAP hRgArrow;
static HBITMAP hUpArrowD;
static HBITMAP hDnArrowD;
static HBITMAP hLfArrowD;
static HBITMAP hRgArrowD;
static HBITMAP hUpArrowI;
static HBITMAP hDnArrowI;
static HBITMAP hLfArrowI;
static HBITMAP hRgArrowI;
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#define TOP_ARROW(flags,pressed) \
   (((flags)&ESB_DISABLE_UP) ? hUpArrowI : ((pressed) ? hUpArrowD:hUpArrow))
#define BOTTOM_ARROW(flags,pressed) \
   (((flags)&ESB_DISABLE_DOWN) ? hDnArrowI : ((pressed) ? hDnArrowD:hDnArrow))
#define LEFT_ARROW(flags,pressed) \
   (((flags)&ESB_DISABLE_LEFT) ? hLfArrowI : ((pressed) ? hLfArrowD:hLfArrow))
#define RIGHT_ARROW(flags,pressed) \
   (((flags)&ESB_DISABLE_RIGHT) ? hRgArrowI : ((pressed) ? hRgArrowD:hRgArrow))

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  /* Minimum size of the rectangle between the arrows */
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  /* Minimum size of the thumb in pixels */
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#define SCROLL_MIN_THUMB 6
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  /* Overlap between arrows and thumb */
#define SCROLL_ARROW_THUMB_OVERLAP ((TWEAK_WineLook == WIN31_LOOK) ? 1 : 0)
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  /* Delay (in ms) before first repetition when holding the button down */
#define SCROLL_FIRST_DELAY   200

  /* Delay (in ms) between scroll repetitions */
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#define SCROLL_REPEAT_DELAY  50
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  /* Scroll timer id */
#define SCROLL_TIMER   0

  /* Scroll-bar hit testing */
enum SCROLL_HITTEST
{
    SCROLL_NOWHERE,      /* Outside the scroll bar */
    SCROLL_TOP_ARROW,    /* Top or left arrow */
    SCROLL_TOP_RECT,     /* Rectangle between the top arrow and the thumb */
    SCROLL_THUMB,        /* Thumb rectangle */
    SCROLL_BOTTOM_RECT,  /* Rectangle between the thumb and the bottom arrow */
    SCROLL_BOTTOM_ARROW  /* Bottom or right arrow */
};
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 /* What to do after SCROLL_SetScrollInfo() */
#define SA_SSI_HIDE		0x0001
#define SA_SSI_SHOW		0x0002
#define SA_SSI_REFRESH		0x0004
#define SA_SSI_REPAINT_ARROWS	0x0008

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 /* Thumb-tracking info */
static HWND SCROLL_TrackingWin = 0;
static INT  SCROLL_TrackingBar = 0;
static INT  SCROLL_TrackingPos = 0;
static INT  SCROLL_TrackingVal = 0;
 /* Hit test code of the last button-down event */
static enum SCROLL_HITTEST SCROLL_trackHitTest;
static BOOL SCROLL_trackVertical;
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 /* Is the moving thumb being displayed? */
static BOOL SCROLL_MovingThumb = FALSE;
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static BOOL SCROLL_ShowScrollBar( HWND hwnd, INT nBar,
static INT SCROLL_SetScrollInfo( HWND hwnd, INT nBar,
				   const SCROLLINFO *info, INT *action );
static void SCROLL_DrawInterior_9x( HWND hwnd, HDC hdc, INT nBar,
				    RECT *rect, INT arrowSize,
				    INT thumbSize, INT thumbPos,
				    UINT flags, BOOL vertical,
				    BOOL top_selected, BOOL bottom_selected );
static LRESULT WINAPI ScrollBarWndProc( HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam );


/*********************************************************************
 * scrollbar class descriptor
 */
const struct builtin_class_descr SCROLL_builtin_class =
{
    "ScrollBar",            /* name */
    CS_GLOBALCLASS | CS_DBLCLKS | CS_VREDRAW | CS_HREDRAW | CS_PARENTDC, /* style  */
    NULL,                   /* procA (winproc is Unicode only) */
    ScrollBarWndProc,       /* procW */
    sizeof(SCROLLBAR_INFO), /* extra */
    
/***********************************************************************
 *           SCROLL_ScrollInfoValid
 *
 *  Determine if the supplied SCROLLINFO struct is valid.
 */
inline static BOOL SCROLL_ScrollInfoValid(
LPSCROLLINFO info /* [in] The SCROLLINFO struct to be tested */)
{
    return !(info->fMask & ~(SIF_ALL | SIF_DISABLENOSCROLL)
        || (info->cbSize != sizeof(*info)
            && info->cbSize != sizeof(*info) - sizeof(info->nTrackPos)));
}
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/***********************************************************************
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 *           SCROLL_LoadBitmaps
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 */
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static void SCROLL_LoadBitmaps(void)
{
    hUpArrow  = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_UPARROW) );
    hDnArrow  = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_DNARROW) );
    hLfArrow  = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_LFARROW) );
    hRgArrow  = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_RGARROW) );
    hUpArrowD = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_UPARROWD) );
    hDnArrowD = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_DNARROWD) );
    hLfArrowD = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_LFARROWD) );
    hRgArrowD = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_RGARROWD) );
    hUpArrowI = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_UPARROWI) );
    hDnArrowI = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_DNARROWI) );
    hLfArrowI = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_LFARROWI) );
    hRgArrowI = LoadBitmapA( 0, MAKEINTRESOURCEA(OBM_RGARROWI) );
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/***********************************************************************
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 */
static SCROLLBAR_INFO *SCROLL_GetScrollBarInfo( HWND hwnd, INT nBar )
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{
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    SCROLLBAR_INFO *infoPtr;
    WND *wndPtr = WIN_FindWndPtr( hwnd );
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    if (!wndPtr) return NULL;
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    switch(nBar)
    {
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        case SB_HORZ: infoPtr = (SCROLLBAR_INFO *)wndPtr->pHScroll; break;
        case SB_VERT: infoPtr = (SCROLLBAR_INFO *)wndPtr->pVScroll; break;
        case SB_CTL:  infoPtr = (SCROLLBAR_INFO *)wndPtr->wExtra; break;
        default:
            WIN_ReleaseWndPtr( wndPtr );
            return NULL;
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    if (!infoPtr)  /* Create the info structure if needed */
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    {
        if ((infoPtr = HeapAlloc( GetProcessHeap(), 0, sizeof(SCROLLBAR_INFO) )))
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        {
            infoPtr->minVal = infoPtr->curVal = infoPtr->page = 0;
            infoPtr->maxVal = 100;
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            infoPtr->flags  = ESB_ENABLE_BOTH;
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            if (nBar == SB_HORZ) wndPtr->pHScroll = infoPtr;
            else wndPtr->pVScroll = infoPtr;
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        }
        if (!hUpArrow) SCROLL_LoadBitmaps();
    }
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    return infoPtr;
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/***********************************************************************
 *           SCROLL_GetScrollBarRect
 *
 * Compute the scroll bar rectangle, in drawing coordinates (i.e. client
 * coords for SB_CTL, window coords for SB_VERT and SB_HORZ).
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 * 'arrowSize' returns the width or height of an arrow (depending on
 * the orientation of the scrollbar), 'thumbSize' returns the size of
 * the thumb, and 'thumbPos' returns the position of the thumb
 * relative to the left or to the top.
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 * Return TRUE if the scrollbar is vertical, FALSE if horizontal.
 */
static BOOL SCROLL_GetScrollBarRect( HWND hwnd, INT nBar, RECT *lprect,
                                       INT *arrowSize, INT *thumbSize,
                                       INT *thumbPos )
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{
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    WND *wndPtr = WIN_FindWndPtr( hwnd );

    switch(nBar)
    {
      case SB_HORZ:
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        lprect->left   = wndPtr->rectClient.left - wndPtr->rectWindow.left;
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        lprect->top    = wndPtr->rectClient.bottom - wndPtr->rectWindow.top;
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        lprect->right  = wndPtr->rectClient.right - wndPtr->rectWindow.left;
        lprect->bottom = lprect->top + GetSystemMetrics(SM_CYHSCROLL);
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	if(wndPtr->dwStyle & WS_BORDER) {
	  lprect->left--;
	  lprect->right++;
	} else if(wndPtr->dwStyle & WS_VSCROLL)
	  lprect->right++;
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        vertical = FALSE;
	break;

      case SB_VERT:
        if((wndPtr->dwExStyle & WS_EX_LEFTSCROLLBAR) != 0)
            lprect->left   = wndPtr->rectClient.left - wndPtr->rectWindow.left - GetSystemMetrics(SM_CXVSCROLL);
        else
            lprect->left   = wndPtr->rectClient.right - wndPtr->rectWindow.left;
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        lprect->top    = wndPtr->rectClient.top - wndPtr->rectWindow.top;
        lprect->right  = lprect->left + GetSystemMetrics(SM_CXVSCROLL);
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        lprect->bottom = wndPtr->rectClient.bottom - wndPtr->rectWindow.top;
	if(wndPtr->dwStyle & WS_BORDER) {
	  lprect->top--;
	  lprect->bottom++;
	} else if(wndPtr->dwStyle & WS_HSCROLL)
	  lprect->bottom++;
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        vertical = TRUE;
	break;

      case SB_CTL:
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        vertical = ((wndPtr->dwStyle & SBS_VERT) != 0);
	break;
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    default:
        WIN_ReleaseWndPtr(wndPtr);
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        return FALSE;
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    }

    if (vertical) pixels = lprect->bottom - lprect->top;
    else pixels = lprect->right - lprect->left;

    if (pixels <= 2*GetSystemMetrics(SM_CXVSCROLL) + SCROLL_MIN_RECT)
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    {
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        if (pixels > SCROLL_MIN_RECT)
            *arrowSize = (pixels - SCROLL_MIN_RECT) / 2;
        else
            *arrowSize = 0;
        *thumbPos = *thumbSize = 0;
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    }
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    else
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    {
        SCROLLBAR_INFO *info = SCROLL_GetScrollBarInfo( hwnd, nBar );
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        *arrowSize = GetSystemMetrics(SM_CXVSCROLL);
        pixels -= (2 * (GetSystemMetrics(SM_CXVSCROLL) - SCROLL_ARROW_THUMB_OVERLAP));
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        {
	    *thumbSize = MulDiv(pixels,info->page,(info->maxVal-info->minVal+1));
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            if (*thumbSize < SCROLL_MIN_THUMB) *thumbSize = SCROLL_MIN_THUMB;
        }
        else *thumbSize = GetSystemMetrics(SM_CXVSCROLL);
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        if (((pixels -= *thumbSize ) < 0) ||
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            ((info->flags & ESB_DISABLE_BOTH) == ESB_DISABLE_BOTH))
        {
            /* Rectangle too small or scrollbar disabled -> no thumb */
            *thumbPos = *thumbSize = 0;
        }
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        else
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        {
            INT max = info->maxVal - max( info->page-1, 0 );
            if (info->minVal >= max)
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                *thumbPos = *arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
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            else
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                *thumbPos = *arrowSize - SCROLL_ARROW_THUMB_OVERLAP
		  + MulDiv(pixels, (info->curVal-info->minVal),(max - info->minVal));
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        }
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    }
    WIN_ReleaseWndPtr(wndPtr);
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    return vertical;
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/***********************************************************************
 *           SCROLL_GetThumbVal
 *
 * Compute the current scroll position based on the thumb position in pixels
 * from the top of the scroll-bar.
 */
static UINT SCROLL_GetThumbVal( SCROLLBAR_INFO *infoPtr, RECT *rect,
                                  BOOL vertical, INT pos )
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{
    INT thumbSize;
    INT pixels = vertical ? rect->bottom-rect->top : rect->right-rect->left;
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    if ((pixels -= 2*(GetSystemMetrics(SM_CXVSCROLL) - SCROLL_ARROW_THUMB_OVERLAP)) <= 0)
        return infoPtr->minVal;
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    {
        thumbSize = MulDiv(pixels,infoPtr->page,(infoPtr->maxVal-infoPtr->minVal+1));
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        if (thumbSize < SCROLL_MIN_THUMB) thumbSize = SCROLL_MIN_THUMB;
    }
    else thumbSize = GetSystemMetrics(SM_CXVSCROLL);
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    if ((pixels -= thumbSize) <= 0) return infoPtr->minVal;
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    pos = max( 0, pos - (GetSystemMetrics(SM_CXVSCROLL) - SCROLL_ARROW_THUMB_OVERLAP) );
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    if (pos > pixels) pos = pixels;
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    if (!infoPtr->page) pos *= infoPtr->maxVal - infoPtr->minVal;
    else pos *= infoPtr->maxVal - infoPtr->minVal - infoPtr->page + 1;
    return infoPtr->minVal + ((pos + pixels / 2) / pixels);
/***********************************************************************
 *           SCROLL_PtInRectEx
 */
static BOOL SCROLL_PtInRectEx( LPRECT lpRect, POINT pt, BOOL vertical )

    if (vertical)
    {
	rect.left -= lpRect->right - lpRect->left;
	rect.right += lpRect->right - lpRect->left;
    }
    else
    {
	rect.top -= lpRect->bottom - lpRect->top;
	rect.bottom += lpRect->bottom - lpRect->top;
    }
}

/***********************************************************************
 *           SCROLL_ClipPos
 */
static POINT SCROLL_ClipPos( LPRECT lpRect, POINT pt )
{
    if( pt.x < lpRect->left )
	pt.x = lpRect->left;
    else
    if( pt.x > lpRect->right )
	pt.x = lpRect->right;

    if( pt.y < lpRect->top )
	pt.y = lpRect->top;
    else
    if( pt.y > lpRect->bottom )
	pt.y = lpRect->bottom;

    return pt;
}

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/***********************************************************************
 *           SCROLL_HitTest
 *
 * Scroll-bar hit testing (don't confuse this with WM_NCHITTEST!).
 */
static enum SCROLL_HITTEST SCROLL_HitTest( HWND hwnd, INT nBar,
                                           POINT pt, BOOL bDragging )
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{
    INT arrowSize, thumbSize, thumbPos;
    RECT rect;
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    BOOL vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
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                                           &arrowSize, &thumbSize, &thumbPos );

    if ( (bDragging && !SCROLL_PtInRectEx( &rect, pt, vertical )) ||
	 (!PtInRect( &rect, pt )) ) return SCROLL_NOWHERE;
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    if (vertical)
    {
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        if (pt.y < rect.top + arrowSize) return SCROLL_TOP_ARROW;
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        if (pt.y >= rect.bottom - arrowSize) return SCROLL_BOTTOM_ARROW;
        if (!thumbPos) return SCROLL_TOP_RECT;
        pt.y -= rect.top;
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        if (pt.y < thumbPos) return SCROLL_TOP_RECT;
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        if (pt.y >= thumbPos + thumbSize) return SCROLL_BOTTOM_RECT;
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    }
    else  /* horizontal */
    {
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        if (pt.x < rect.left + arrowSize) return SCROLL_TOP_ARROW;
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        if (pt.x >= rect.right - arrowSize) return SCROLL_BOTTOM_ARROW;
        if (!thumbPos) return SCROLL_TOP_RECT;
        pt.x -= rect.left;
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        if (pt.x < thumbPos) return SCROLL_TOP_RECT;
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        if (pt.x >= thumbPos + thumbSize) return SCROLL_BOTTOM_RECT;
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    }
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/***********************************************************************
 *           SCROLL_DrawArrows
 *
 * Draw the scroll bar arrows.
 */
static void SCROLL_DrawArrows_9x( HDC hdc, SCROLLBAR_INFO *infoPtr,
                                  RECT *rect, INT arrowSize, BOOL vertical,
                                  BOOL top_pressed, BOOL bottom_pressed )
{
  RECT r;

  r = *rect;
  if( vertical )
    r.bottom = r.top + arrowSize;
  else
    r.right = r.left + arrowSize;

  DrawFrameControl( hdc, &r, DFC_SCROLL,
		    (vertical ? DFCS_SCROLLUP : DFCS_SCROLLLEFT)
		    | (top_pressed ? (DFCS_PUSHED | DFCS_FLAT) : 0 )
		    | (infoPtr->flags&ESB_DISABLE_LTUP ? DFCS_INACTIVE : 0 ) );

  r = *rect;
  if( vertical )
    r.top = r.bottom-arrowSize;
  else
    r.left = r.right-arrowSize;

  DrawFrameControl( hdc, &r, DFC_SCROLL,
		    (vertical ? DFCS_SCROLLDOWN : DFCS_SCROLLRIGHT)
		    | (bottom_pressed ? (DFCS_PUSHED | DFCS_FLAT) : 0 )
		    | (infoPtr->flags&ESB_DISABLE_RTDN ? DFCS_INACTIVE : 0) );
}

static void SCROLL_DrawArrows_31( HDC hdc, SCROLLBAR_INFO *infoPtr,
				  RECT *rect, INT arrowSize, BOOL vertical,
				  BOOL top_pressed, BOOL bottom_pressed )
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{
    HDC hdcMem = CreateCompatibleDC( hdc );
    HBITMAP hbmpPrev = SelectObject( hdcMem, vertical ?
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                                    TOP_ARROW(infoPtr->flags, top_pressed)
                                    : LEFT_ARROW(infoPtr->flags, top_pressed));
    SetStretchBltMode( hdc, STRETCH_DELETESCANS );
    StretchBlt( hdc, rect->left, rect->top,
                  vertical ? rect->right-rect->left : arrowSize,
                  vertical ? arrowSize : rect->bottom-rect->top,
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                  hdcMem, 0, 0,
                  GetSystemMetrics(SM_CXVSCROLL),GetSystemMetrics(SM_CYHSCROLL),
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                  SRCCOPY );
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                    BOTTOM_ARROW( infoPtr->flags, bottom_pressed )
                    : RIGHT_ARROW( infoPtr->flags, bottom_pressed ) );
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    if (vertical)
        StretchBlt( hdc, rect->left, rect->bottom - arrowSize,
                      rect->right - rect->left, arrowSize,
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                      hdcMem, 0, 0,
                      GetSystemMetrics(SM_CXVSCROLL),GetSystemMetrics(SM_CYHSCROLL),
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                      SRCCOPY );
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    else
        StretchBlt( hdc, rect->right - arrowSize, rect->top,
                      arrowSize, rect->bottom - rect->top,
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                      hdcMem, 0, 0,
                      GetSystemMetrics(SM_CXVSCROLL), GetSystemMetrics(SM_CYHSCROLL),
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                      SRCCOPY );
    SelectObject( hdcMem, hbmpPrev );
    DeleteDC( hdcMem );
static void SCROLL_DrawArrows( HDC hdc, SCROLLBAR_INFO *infoPtr,
			       RECT *rect, INT arrowSize, BOOL vertical,
			       BOOL top_pressed, BOOL bottom_pressed )
{
  if( TWEAK_WineLook == WIN31_LOOK )
    SCROLL_DrawArrows_31( hdc, infoPtr, rect, arrowSize,
			  vertical, top_pressed,bottom_pressed );
  else
    SCROLL_DrawArrows_9x( hdc, infoPtr, rect, arrowSize,
			  vertical, top_pressed,bottom_pressed );
}

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/***********************************************************************
 *           SCROLL_DrawMovingThumb
 *
 * Draw the moving thumb rectangle.
 */
static void SCROLL_DrawMovingThumb_31( HDC hdc, RECT *rect, BOOL vertical,
				       INT arrowSize, INT thumbSize )
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{
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    if (vertical)
    {
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        r.top += SCROLL_TrackingPos;
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        if (r.top < rect->top + arrowSize - SCROLL_ARROW_THUMB_OVERLAP)
	    r.top = rect->top + arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
        if (r.top + thumbSize >
	               rect->bottom - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP))
            r.top = rect->bottom - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP)
	                                                          - thumbSize;
        r.bottom = r.top + thumbSize;
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    }
    else
    {
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        r.left += SCROLL_TrackingPos;
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        if (r.left < rect->left + arrowSize - SCROLL_ARROW_THUMB_OVERLAP)
	    r.left = rect->left + arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
        if (r.left + thumbSize >
	               rect->right - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP))
            r.left = rect->right - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP)
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	                                                          - thumbSize;
        r.right = r.left + thumbSize;
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    }
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    SCROLL_MovingThumb = !SCROLL_MovingThumb;
static void SCROLL_DrawMovingThumb_9x( HDC hdc, RECT *rect, BOOL vertical,
				       INT arrowSize, INT thumbSize )
{
  INT pos = SCROLL_TrackingPos;
  INT max_size;

  if( vertical )
    max_size = rect->bottom - rect->top;
  else
    max_size = rect->right - rect->left;

  max_size -= (arrowSize-SCROLL_ARROW_THUMB_OVERLAP) + thumbSize;

  if( pos < (arrowSize-SCROLL_ARROW_THUMB_OVERLAP) )
    pos = (arrowSize-SCROLL_ARROW_THUMB_OVERLAP);
  else if( pos > max_size )
    pos = max_size;

  SCROLL_DrawInterior_9x( SCROLL_TrackingWin, hdc, SCROLL_TrackingBar,
			  rect, arrowSize, thumbSize, pos,
			  0, vertical, FALSE, FALSE );
  SCROLL_MovingThumb = !SCROLL_MovingThumb;
}

static void SCROLL_DrawMovingThumb( HDC hdc, RECT *rect, BOOL vertical,
				    INT arrowSize, INT thumbSize )
{
  if( TWEAK_WineLook == WIN31_LOOK )
    SCROLL_DrawMovingThumb_31( hdc, rect, vertical, arrowSize, thumbSize );
  else
    SCROLL_DrawMovingThumb_9x( hdc, rect, vertical, arrowSize, thumbSize );
}
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/***********************************************************************
 *           SCROLL_DrawInterior
 *
 * Draw the scroll bar interior (everything except the arrows).
 */
static void SCROLL_DrawInterior_9x( HWND hwnd, HDC hdc, INT nBar,
				    RECT *rect, INT arrowSize,
				    INT thumbSize, INT thumbPos,
				    UINT flags, BOOL vertical,
				    BOOL top_selected, BOOL bottom_selected )
{
    RECT r;
    HPEN hSavePen;
    HBRUSH hSaveBrush,hBrush;

    /* Only scrollbar controls send WM_CTLCOLORSCROLLBAR.
     * The window-owned scrollbars need to call DEFWND_ControlColor
     * to correctly setup default scrollbar colors
     */
    if (nBar == SB_CTL)
      hBrush = (HBRUSH)SendMessageA( GetParent(hwnd), WM_CTLCOLORSCROLLBAR,
				     (WPARAM)hdc,(LPARAM)hwnd);
    }
    else
    {
      hBrush = DEFWND_ControlColor( hdc, CTLCOLOR_SCROLLBAR );
    }

    hSavePen = SelectObject( hdc, SYSCOLOR_GetPen(COLOR_WINDOWFRAME) );
    hSaveBrush = SelectObject( hdc, hBrush );

    /* Calculate the scroll rectangle */
    r = *rect;
    if (vertical)
    {
        r.top    += arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
        r.bottom -= (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
    }
    else
    {
        r.left  += arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
        r.right -= (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
    }

    /* Draw the scroll rectangles and thumb */
    if (!thumbPos)  /* No thumb to draw */
    {
        PatBlt( hdc, r.left, r.top,
                     r.right - r.left, r.bottom - r.top,
                     PATCOPY );

        /* cleanup and return */
        SelectObject( hdc, hSavePen );
        SelectObject( hdc, hSaveBrush );
        return;
    }

    if (vertical)
    {
        PatBlt( hdc, r.left, r.top,
                  r.right - r.left,
                  thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP),
                  top_selected ? 0x0f0000 : PATCOPY );
        r.top += thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
        PatBlt( hdc, r.left, r.top + thumbSize,
                  r.right - r.left,
                  r.bottom - r.top - thumbSize,
                  bottom_selected ? 0x0f0000 : PATCOPY );
        r.bottom = r.top + thumbSize;
    }
    else  /* horizontal */
    {
        PatBlt( hdc, r.left, r.top,
                  thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP),
                  r.bottom - r.top,
                  top_selected ? 0x0f0000 : PATCOPY );
        r.left += thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
        PatBlt( hdc, r.left + thumbSize, r.top,
                  r.right - r.left - thumbSize,
                  r.bottom - r.top,
                  bottom_selected ? 0x0f0000 : PATCOPY );
        r.right = r.left + thumbSize;
    }

    /* Draw the thumb */
    DrawEdge( hdc, &r, EDGE_RAISED, BF_RECT | BF_MIDDLE  );

    /* cleanup */
    SelectObject( hdc, hSavePen );
    SelectObject( hdc, hSaveBrush );
}


static void SCROLL_DrawInterior( HWND hwnd, HDC hdc, INT nBar,
                                 RECT *rect, INT arrowSize,
                                 INT thumbSize, INT thumbPos,
                                 UINT flags, BOOL vertical,
                                 BOOL top_selected, BOOL bottom_selected )
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{
    HPEN hSavePen;
    HBRUSH hSaveBrush,hBrush;
    BOOL Save_SCROLL_MovingThumb = SCROLL_MovingThumb;

    if (Save_SCROLL_MovingThumb &&
        (SCROLL_TrackingWin == hwnd) &&
        (SCROLL_TrackingBar == nBar))
        SCROLL_DrawMovingThumb( hdc, rect, vertical, arrowSize, thumbSize );
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      /* Select the correct brush and pen */

    if (TWEAK_WineLook == WIN31_LOOK && (flags & ESB_DISABLE_BOTH) == ESB_DISABLE_BOTH)
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    {
        /* This ought to be the color of the parent window */
        hBrush = GetSysColorBrush(COLOR_WINDOW);
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    }
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    else
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    {
        /* Only scrollbar controls send WM_CTLCOLORSCROLLBAR.
         * The window-owned scrollbars need to call DEFWND_ControlColor
         * to correctly setup default scrollbar colors
         */
        if (nBar == SB_CTL) {
            hBrush = (HBRUSH)SendMessageA( GetParent(hwnd), WM_CTLCOLORSCROLLBAR,
                                           (WPARAM)hdc,(LPARAM)hwnd);
        } else {
            hBrush = DEFWND_ControlColor( hdc, CTLCOLOR_SCROLLBAR );
    hSavePen = SelectObject( hdc, SYSCOLOR_GetPen(COLOR_WINDOWFRAME) );
    hSaveBrush = SelectObject( hdc, hBrush );
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      /* Calculate the scroll rectangle */

    r = *rect;
    if (vertical)
    {
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        r.top    += arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
        r.bottom -= (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
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    }
    else
    {
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        r.left  += arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
        r.right -= (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
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    }

      /* Draw the scroll bar frame */

	/* Only draw outline if Win 3.1.  Mar 24, 1999 - Ronald B. Cemer */
    if (TWEAK_WineLook == WIN31_LOOK)
	Rectangle( hdc, r.left, r.top, r.right, r.bottom );
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      /* Draw the scroll rectangles and thumb */

    if (!thumbPos)  /* No thumb to draw */
    {
        INT offset = (TWEAK_WineLook > WIN31_LOOK) ? 0 : 1;

        PatBlt( hdc, r.left+offset, r.top+offset,
                     r.right - r.left - 2*offset, r.bottom - r.top - 2*offset,
                     PATCOPY );

        /* cleanup and return */
        SelectObject( hdc, hSavePen );
        SelectObject( hdc, hSaveBrush );
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        return;
    }

    if (vertical)
    {
        INT offset = (TWEAK_WineLook == WIN31_LOOK) ? 1 : 0;

        PatBlt( hdc, r.left + offset, r.top + offset,
                  r.right - r.left - offset*2,
                  thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP) - offset,
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                  top_selected ? 0x0f0000 : PATCOPY );
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        r.top += thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
        PatBlt( hdc, r.left + offset, r.top + thumbSize,
                  r.right - r.left - offset*2,
                  r.bottom - r.top - thumbSize - offset,
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                  bottom_selected ? 0x0f0000 : PATCOPY );
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        r.bottom = r.top + thumbSize;
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    }
    else  /* horizontal */
    {
        INT offset = (TWEAK_WineLook == WIN31_LOOK) ? 1 : 0;

        PatBlt( hdc, r.left + offset, r.top + offset,
                  thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP),
                  r.bottom - r.top - offset*2,
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                  top_selected ? 0x0f0000 : PATCOPY );
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        r.left += thumbPos - (arrowSize - SCROLL_ARROW_THUMB_OVERLAP);
        PatBlt( hdc, r.left + thumbSize, r.top + offset,
                  r.right - r.left - thumbSize - offset,
                  r.bottom - r.top - offset*2,
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                  bottom_selected ? 0x0f0000 : PATCOPY );
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        r.right = r.left + thumbSize;
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    }

      /* Draw the thumb */

    SelectObject( hdc, GetSysColorBrush(COLOR_BTNFACE) );
    if (TWEAK_WineLook == WIN31_LOOK)
    {
	Rectangle( hdc, r.left, r.top, r.right, r.bottom );
	r.top++, r.left++;
    }
    else
    {
	Rectangle( hdc, r.left+1, r.top+1, r.right-1, r.bottom-1 );
    DrawEdge( hdc, &r, EDGE_RAISED, BF_RECT );
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        (SCROLL_TrackingWin == hwnd) &&
        (SCROLL_TrackingBar == nBar))
        SCROLL_DrawMovingThumb( hdc, rect, vertical, arrowSize, thumbSize );

    /* cleanup */
    SelectObject( hdc, hSavePen );
    SelectObject( hdc, hSaveBrush );
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}
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/***********************************************************************
 *           SCROLL_DrawScrollBar
 *
 * Redraw the whole scrollbar.
 */
void SCROLL_DrawScrollBar( HWND hwnd, HDC hdc, INT nBar,
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{
    INT arrowSize, thumbSize, thumbPos;
    RECT rect;
    BOOL vertical;
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    WND *wndPtr = WIN_FindWndPtr( hwnd );
    SCROLLBAR_INFO *infoPtr = SCROLL_GetScrollBarInfo( hwnd, nBar );
    BOOL Save_SCROLL_MovingThumb = SCROLL_MovingThumb;
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    if (!wndPtr || !infoPtr ||
        ((nBar == SB_VERT) && !(wndPtr->dwStyle & WS_VSCROLL)) ||
        ((nBar == SB_HORZ) && !(wndPtr->dwStyle & WS_HSCROLL))) goto END;
    if (!WIN_IsWindowDrawable( hwnd, FALSE )) goto END;
    hwnd = wndPtr->hwndSelf;  /* make it a full handle */
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    vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
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                                        &arrowSize, &thumbSize, &thumbPos );
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    /* do not draw if the scrollbar rectangle is empty */
    if(IsRectEmpty(&rect))
      goto END;

    if (Save_SCROLL_MovingThumb &&
        (SCROLL_TrackingWin == hwnd) &&
        (SCROLL_TrackingBar == nBar))
        SCROLL_DrawMovingThumb( hdc, &rect, vertical, arrowSize, thumbSize );

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      /* Draw the arrows */

	if( vertical == SCROLL_trackVertical && GetCapture() == hwnd )
	    SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
			       (SCROLL_trackHitTest == SCROLL_TOP_ARROW),
			       (SCROLL_trackHitTest == SCROLL_BOTTOM_ARROW) );
	else
	    SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
							       FALSE, FALSE );
    }
    if( interior )
	SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
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                         thumbPos, infoPtr->flags, vertical, FALSE, FALSE );

    if (Save_SCROLL_MovingThumb &&
        (SCROLL_TrackingWin == hwnd) &&
        (SCROLL_TrackingBar == nBar))
        SCROLL_DrawMovingThumb( hdc, &rect, vertical, arrowSize, thumbSize );

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    /* if scroll bar has focus, reposition the caret */
    if(hwnd==GetFocus() && (nBar==SB_CTL))
    {
        if (!vertical)
        {
            SetCaretPos(thumbPos+1, rect.top+1);
        }
        else
        {
            SetCaretPos(rect.top+1, thumbPos+1);
        }
    }

END:
    WIN_ReleaseWndPtr(wndPtr);
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/***********************************************************************
 *           SCROLL_RefreshScrollBar
 *
 * Repaint the scroll bar interior after a SetScrollRange() or
 * SetScrollPos() call.
 */
static void SCROLL_RefreshScrollBar( HWND hwnd, INT nBar,
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{
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                           DCX_CACHE | ((nBar == SB_CTL) ? 0 : DCX_WINDOW) );
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    if (!hdc) return;

    SCROLL_DrawScrollBar( hwnd, hdc, nBar, arrows, interior );
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/***********************************************************************
 *           SCROLL_HandleKbdEvent
 *
 * Handle a keyboard event (only for SB_CTL scrollbars with focus).
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 */
static void SCROLL_HandleKbdEvent(
HWND hwnd /* [in] Handle of window with scrollbar(s) */,
WPARAM wParam /* [in] Variable input including enable state */,
LPARAM lParam /* [in] Variable input including input point */)
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{
    TRACE("hwnd=%p wParam=%d lParam=%ld\n", hwnd, wParam, lParam);

    /* hide caret on first KEYDOWN to prevent flicker */
    if ((lParam & PFD_DOUBLEBUFFER_DONTCARE) == 0)
        HideCaret(hwnd);
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    switch(wParam)
    {
    case VK_PRIOR: wParam = SB_PAGEUP; break;
    case VK_NEXT:  wParam = SB_PAGEDOWN; break;
    case VK_HOME:  wParam = SB_TOP; break;
    case VK_END:   wParam = SB_BOTTOM; break;
    case VK_UP:    wParam = SB_LINEUP; break;
    case VK_DOWN:  wParam = SB_LINEDOWN; break;
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    }
    SendMessageW(GetParent(hwnd),
        ((GetWindowLongA( hwnd, GWL_STYLE ) & SBS_VERT) ?
            WM_VSCROLL : WM_HSCROLL), wParam, (LPARAM)hwnd);
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/***********************************************************************
 *           SCROLL_HandleScrollEvent
 *
 * Handle a mouse or timer event for the scrollbar.
 * 'pt' is the location of the mouse event in client (for SB_CTL) or
 * windows coordinates.
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 */
static void SCROLL_HandleScrollEvent( HWND hwnd, INT nBar, UINT msg, POINT pt)
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{
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      /* Previous mouse position for timer events */
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      /* Thumb position when tracking started. */
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      /* Position in the scroll-bar of the last button-down event. */
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      /* Position in the scroll-bar of the last mouse event. */
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    enum SCROLL_HITTEST hittest;
    HWND hwndOwner, hwndCtl;
    BOOL vertical;
    INT arrowSize, thumbSize, thumbPos;
    RECT rect;
    HDC hdc;
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    SCROLLBAR_INFO *infoPtr = SCROLL_GetScrollBarInfo( hwnd, nBar );
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    if (!infoPtr) return;
    if ((SCROLL_trackHitTest == SCROLL_NOWHERE) && (msg != WM_LBUTTONDOWN))
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    hdc = GetDCEx( hwnd, 0, DCX_CACHE | ((nBar == SB_CTL) ? 0 : DCX_WINDOW));
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    vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
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                                        &arrowSize, &thumbSize, &thumbPos );
    hwndOwner = (nBar == SB_CTL) ? GetParent(hwnd) : hwnd;
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    hwndCtl   = (nBar == SB_CTL) ? hwnd : 0;

    switch(msg)
    {
      case WM_LBUTTONDOWN:  /* Initialise mouse tracking */
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          HideCaret(hwnd);  /* hide caret while holding down LBUTTON */
          SCROLL_trackVertical = vertical;
          SCROLL_trackHitTest  = hittest = SCROLL_HitTest( hwnd, nBar, pt, FALSE );
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          lastClickPos  = vertical ? (pt.y - rect.top) : (pt.x - rect.left);
          lastMousePos  = lastClickPos;
          trackThumbPos = thumbPos;
          prevPt = pt;
          if (nBar == SB_CTL && (GetWindowLongA(hwnd, GWL_STYLE) & WS_TABSTOP)) SetFocus( hwnd );
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          break;

      case WM_MOUSEMOVE:
          hittest = SCROLL_HitTest( hwnd, nBar, pt, TRUE );
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          prevPt = pt;
          break;

      case WM_LBUTTONUP:
          hittest = SCROLL_NOWHERE;
          ReleaseCapture();
          /* if scrollbar has focus, show back caret */
          if (hwnd==GetFocus()) ShowCaret(hwnd);
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          break;

      case WM_SYSTIMER:
          pt = prevPt;
          hittest = SCROLL_HitTest( hwnd, nBar, pt, FALSE );
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          break;

      default:
          return;  /* Should never happen */
    }