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/*
* Scrollbar control
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "config.h"
#include <stdarg.h>
#include "windef.h"
#include "winbase.h"
#include "wingdi.h"
#include "controls.h"
#include "win.h"
#include "wine/debug.h"
#include "user_private.h"
WINE_DEFAULT_DEBUG_CHANNEL(scroll);
/* data for a single scroll bar */
typedef struct
{
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;
/* data for window that has (one or two) scroll bars */
typedef struct
{
SCROLLBAR_INFO horz;
SCROLLBAR_INFO vert;
} WINSCROLLBAR_INFO, *LPWINSCROLLBAR_INFO;
/* Minimum size of the rectangle between the arrows */
#define SCROLL_MIN_RECT 4
/* Minimum size of the thumb in pixels */
#define SCROLL_MIN_THUMB 6
/* Overlap between arrows and thumb */
#define SCROLL_ARROW_THUMB_OVERLAP 0
/* Delay (in ms) before first repetition when holding the button down */
#define SCROLL_FIRST_DELAY 200
/* Delay (in ms) between scroll repetitions */
#define SCROLL_REPEAT_DELAY 50
/* 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 */
};
/* 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
/* 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;
/* Is the moving thumb being displayed? */
static BOOL SCROLL_MovingThumb = FALSE;
/* Local functions */
static BOOL SCROLL_ShowScrollBar( HWND hwnd, INT nBar,
BOOL fShowH, BOOL fShowV );
static INT SCROLL_SetScrollInfo( HWND hwnd, INT nBar,
const SCROLLINFO *info, BOOL bRedraw );
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 );
/*********************************************************************
* scrollbar class descriptor
*/
static const WCHAR scrollbarW[] = {'S','c','r','o','l','l','B','a','r',0};
const struct builtin_class_descr SCROLL_builtin_class =
{
scrollbarW, /* name */
CS_DBLCLKS | CS_VREDRAW | CS_HREDRAW | CS_PARENTDC, /* style */
WINPROC_SCROLLBAR, /* proc */
sizeof(SCROLLBAR_INFO), /* extra */
IDC_ARROW, /* cursor */
0 /* brush */
};
/***********************************************************************
* SCROLL_ScrollInfoValid
*
* Determine if the supplied SCROLLINFO struct is valid.
* info [in] The SCROLLINFO struct to be tested
*/
static inline BOOL SCROLL_ScrollInfoValid( LPCSCROLLINFO info )
{
return !(info->fMask & ~(SIF_ALL | SIF_DISABLENOSCROLL)
|| (info->cbSize != sizeof(*info)
&& info->cbSize != sizeof(*info) - sizeof(info->nTrackPos)));
}
/***********************************************************************
* SCROLL_GetInternalInfo
* Returns pointer to internal SCROLLBAR_INFO structure for nBar
* or NULL if failed (f.i. scroll bar does not exist yet)
* If alloc is TRUE and the struct does not exist yet, create it.
*/
static SCROLLBAR_INFO *SCROLL_GetInternalInfo( HWND hwnd, INT nBar, BOOL alloc )
{
SCROLLBAR_INFO *infoPtr = NULL;
WND *wndPtr = WIN_GetPtr( hwnd );
if (!wndPtr || wndPtr == WND_OTHER_PROCESS || wndPtr == WND_DESKTOP) return NULL;
switch(nBar)
{
case SB_HORZ:
if (wndPtr->pScroll) infoPtr = &((LPWINSCROLLBAR_INFO)wndPtr->pScroll)->horz;
break;
case SB_VERT:
if (wndPtr->pScroll) infoPtr = &((LPWINSCROLLBAR_INFO)wndPtr->pScroll)->vert;
break;
case SB_CTL:
infoPtr = (SCROLLBAR_INFO *)wndPtr->wExtra;
break;
case SB_BOTH:
WARN("with SB_BOTH\n");
break;
}
if (!infoPtr && alloc)
{
WINSCROLLBAR_INFO *winInfoPtr;
if (nBar != SB_HORZ && nBar != SB_VERT)
WARN("Cannot initialize nBar=%d\n",nBar);
else if ((winInfoPtr = HeapAlloc( GetProcessHeap(), 0, sizeof(WINSCROLLBAR_INFO) )))
{
/* Set default values */
winInfoPtr->horz.minVal = 0;
winInfoPtr->horz.curVal = 0;
winInfoPtr->horz.page = 0;
/* From MSDN and our own tests:
* max for a standard scroll bar is 100 by default. */
winInfoPtr->horz.maxVal = 100;
winInfoPtr->horz.flags = ESB_ENABLE_BOTH;
winInfoPtr->vert = winInfoPtr->horz;
wndPtr->pScroll = winInfoPtr;
infoPtr = nBar == SB_HORZ ? &winInfoPtr->horz : &winInfoPtr->vert;
}
}
WIN_ReleasePtr( wndPtr );
return infoPtr;
}
/***********************************************************************
* 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).
* '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.
* 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 )
{
INT pixels;
BOOL vertical;
WND *wndPtr = WIN_GetPtr( hwnd );
if (!wndPtr || wndPtr == WND_OTHER_PROCESS || wndPtr == WND_DESKTOP) return FALSE;
switch(nBar)
{
case SB_HORZ:
WIN_GetRectangles( hwnd, COORDS_WINDOW, NULL, lprect );
lprect->top = lprect->bottom;
lprect->bottom += GetSystemMetrics(SM_CYHSCROLL);
if(wndPtr->dwStyle & WS_VSCROLL)
lprect->right++;
vertical = FALSE;
break;
case SB_VERT:
WIN_GetRectangles( hwnd, COORDS_WINDOW, NULL, lprect );
if((wndPtr->dwExStyle & WS_EX_LEFTSCROLLBAR) != 0)
{
lprect->right = lprect->left;
lprect->left -= GetSystemMetrics(SM_CXVSCROLL);
}
else
{
lprect->left = lprect->right;
lprect->right += GetSystemMetrics(SM_CXVSCROLL);
}
if(wndPtr->dwStyle & WS_HSCROLL)
lprect->bottom++;
vertical = TRUE;
break;
case SB_CTL:
GetClientRect( hwnd, lprect );
vertical = ((wndPtr->dwStyle & SBS_VERT) != 0);
break;
default:
WIN_ReleasePtr( wndPtr );
return FALSE;
}
if (vertical) pixels = lprect->bottom - lprect->top;
else pixels = lprect->right - lprect->left;
if (pixels <= 2*GetSystemMetrics(SM_CXVSCROLL) + SCROLL_MIN_RECT)
{
if (pixels > SCROLL_MIN_RECT)
*arrowSize = (pixels - SCROLL_MIN_RECT) / 2;
else
*arrowSize = 0;
*thumbPos = *thumbSize = 0;
}
else
{
SCROLLBAR_INFO *info = SCROLL_GetInternalInfo( hwnd, nBar, FALSE );
if (!info)
{
WARN("called for missing scroll bar\n");
WIN_ReleasePtr( wndPtr );
return FALSE;
}
*arrowSize = GetSystemMetrics(SM_CXVSCROLL);
pixels -= (2 * (GetSystemMetrics(SM_CXVSCROLL) - SCROLL_ARROW_THUMB_OVERLAP));
if (info->page)
{
*thumbSize = MulDiv(pixels,info->page,(info->maxVal-info->minVal+1));
if (*thumbSize < SCROLL_MIN_THUMB) *thumbSize = SCROLL_MIN_THUMB;
}
else *thumbSize = GetSystemMetrics(SM_CXVSCROLL);
if (((pixels -= *thumbSize ) < 0) ||
((info->flags & ESB_DISABLE_BOTH) == ESB_DISABLE_BOTH))
{
/* Rectangle too small or scrollbar disabled -> no thumb */
*thumbPos = *thumbSize = 0;
}
else
{
INT max = info->maxVal - max( info->page-1, 0 );
if (info->minVal >= max)
*thumbPos = *arrowSize - SCROLL_ARROW_THUMB_OVERLAP;
else
*thumbPos = *arrowSize - SCROLL_ARROW_THUMB_OVERLAP
+ MulDiv(pixels, (info->curVal-info->minVal),(max - info->minVal));
}
}
WIN_ReleasePtr( wndPtr );
return vertical;
}
/***********************************************************************
* 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 )
{
INT thumbSize;
INT pixels = vertical ? rect->bottom-rect->top : rect->right-rect->left;
INT range;
if ((pixels -= 2*(GetSystemMetrics(SM_CXVSCROLL) - SCROLL_ARROW_THUMB_OVERLAP)) <= 0)
return infoPtr->minVal;
if (infoPtr->page)
{
thumbSize = MulDiv(pixels,infoPtr->page,(infoPtr->maxVal-infoPtr->minVal+1));
if (thumbSize < SCROLL_MIN_THUMB) thumbSize = SCROLL_MIN_THUMB;
}
else thumbSize = GetSystemMetrics(SM_CXVSCROLL);
if ((pixels -= thumbSize) <= 0) return infoPtr->minVal;
pos = max( 0, pos - (GetSystemMetrics(SM_CXVSCROLL) - SCROLL_ARROW_THUMB_OVERLAP) );
if (pos > pixels) pos = pixels;
if (!infoPtr->page)
range = infoPtr->maxVal - infoPtr->minVal;
else
range = infoPtr->maxVal - infoPtr->minVal - infoPtr->page + 1;
return infoPtr->minVal + MulDiv(pos, range, pixels);
}
/***********************************************************************
* SCROLL_PtInRectEx
*/
static BOOL SCROLL_PtInRectEx( LPRECT lpRect, POINT pt, BOOL vertical )
{
RECT rect = *lpRect;
int scrollbarWidth;
/* Pad hit rect to allow mouse to be dragged outside of scrollbar and
* still be considered in the scrollbar. */
if (vertical)
{
scrollbarWidth = lpRect->right - lpRect->left;
InflateRect(&rect, scrollbarWidth * 8, scrollbarWidth * 2);
}
else
{
scrollbarWidth = lpRect->bottom - lpRect->top;
InflateRect(&rect, scrollbarWidth * 2, scrollbarWidth * 8);
}
return PtInRect( &rect, pt );
}
/***********************************************************************
* 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;
}
/***********************************************************************
* 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 )
{
INT arrowSize, thumbSize, thumbPos;
RECT rect;
BOOL vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
&arrowSize, &thumbSize, &thumbPos );
if ( (bDragging && !SCROLL_PtInRectEx( &rect, pt, vertical )) ||
(!PtInRect( &rect, pt )) ) return SCROLL_NOWHERE;
if (vertical)
{
if (pt.y < rect.top + arrowSize) return SCROLL_TOP_ARROW;
if (pt.y >= rect.bottom - arrowSize) return SCROLL_BOTTOM_ARROW;
if (!thumbPos) return SCROLL_TOP_RECT;
pt.y -= rect.top;
if (pt.y < thumbPos) return SCROLL_TOP_RECT;
if (pt.y >= thumbPos + thumbSize) return SCROLL_BOTTOM_RECT;
}
else /* horizontal */
{
if (pt.x < rect.left + arrowSize) return SCROLL_TOP_ARROW;
if (pt.x >= rect.right - arrowSize) return SCROLL_BOTTOM_ARROW;
if (!thumbPos) return SCROLL_TOP_RECT;
pt.x -= rect.left;
if (pt.x < thumbPos) return SCROLL_TOP_RECT;
if (pt.x >= thumbPos + thumbSize) return SCROLL_BOTTOM_RECT;
}
return SCROLL_THUMB;
}
/***********************************************************************
* SCROLL_DrawArrows
*
* Draw the scroll bar arrows.
*/
static void SCROLL_DrawArrows( 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_DrawMovingThumb( 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;
}
/***********************************************************************
* 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)SendMessageW( 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 )
{
RECT r;
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 );
/* Select the correct brush and pen */
/* 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)SendMessageW( 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 bar frame */
/* 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 */
SelectObject( hdc, GetSysColorBrush(COLOR_BTNFACE) );
Rectangle( hdc, r.left+1, r.top+1, r.right-1, r.bottom-1 );
DrawEdge( hdc, &r, EDGE_RAISED, BF_RECT );
if (Save_SCROLL_MovingThumb &&
(SCROLL_TrackingWin == hwnd) &&
(SCROLL_TrackingBar == nBar))
SCROLL_DrawMovingThumb( hdc, rect, vertical, arrowSize, thumbSize );
/* cleanup */
SelectObject( hdc, hSavePen );
SelectObject( hdc, hSaveBrush );
}
/***********************************************************************
* SCROLL_DrawScrollBar
*
* Redraw the whole scrollbar.
*/
void SCROLL_DrawScrollBar( HWND hwnd, HDC hdc, INT nBar,
BOOL arrows, BOOL interior )
{
INT arrowSize, thumbSize, thumbPos;
RECT rect;
BOOL vertical;
SCROLLBAR_INFO *infoPtr = SCROLL_GetInternalInfo( hwnd, nBar, TRUE );
BOOL Save_SCROLL_MovingThumb = SCROLL_MovingThumb;
DWORD style = GetWindowLongW( hwnd, GWL_STYLE );
if (!(hwnd = WIN_GetFullHandle( hwnd ))) return;
if (!infoPtr ||
((nBar == SB_VERT) && !(style & WS_VSCROLL)) ||
((nBar == SB_HORZ) && !(style & WS_HSCROLL))) return;
if (!WIN_IsWindowDrawable( hwnd, FALSE )) return;
vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
&arrowSize, &thumbSize, &thumbPos );
/* do not draw if the scrollbar rectangle is empty */
if(IsRectEmpty(&rect)) return;
if (Save_SCROLL_MovingThumb &&
(SCROLL_TrackingWin == hwnd) &&
(SCROLL_TrackingBar == nBar))
SCROLL_DrawMovingThumb( hdc, &rect, vertical, arrowSize, thumbSize );
/* Draw the arrows */
if (arrows && arrowSize)
{
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,
thumbPos, infoPtr->flags, vertical, FALSE, FALSE );
if (Save_SCROLL_MovingThumb &&
(SCROLL_TrackingWin == hwnd) &&
(SCROLL_TrackingBar == nBar))
SCROLL_DrawMovingThumb( hdc, &rect, vertical, arrowSize, thumbSize );
/* 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);
}
}
}
/***********************************************************************
* SCROLL_DrawSizeGrip
*
* Draw the size grip.
*/
static void SCROLL_DrawSizeGrip( HWND hwnd, HDC hdc)
{
RECT rc;
GetClientRect( hwnd, &rc );
FillRect( hdc, &rc, GetSysColorBrush(COLOR_SCROLLBAR) );
rc.left = max( rc.left, rc.right - GetSystemMetrics(SM_CXVSCROLL) - 1 );
rc.top = max( rc.top, rc.bottom - GetSystemMetrics(SM_CYHSCROLL) - 1 );
DrawFrameControl( hdc, &rc, DFC_SCROLL, DFCS_SCROLLSIZEGRIP );
}
/***********************************************************************
* SCROLL_RefreshScrollBar
*
* Repaint the scroll bar interior after a SetScrollRange() or
* SetScrollPos() call.
*/
static void SCROLL_RefreshScrollBar( HWND hwnd, INT nBar,
BOOL arrows, BOOL interior )
{
HDC hdc = GetDCEx( hwnd, 0,
DCX_CACHE | ((nBar == SB_CTL) ? 0 : DCX_WINDOW) );
if (!hdc) return;
SCROLL_DrawScrollBar( hwnd, hdc, nBar, arrows, interior );
ReleaseDC( hwnd, hdc );
}
/***********************************************************************
* SCROLL_HandleKbdEvent
*
* Handle a keyboard event (only for SB_CTL scrollbars with focus).
*
* PARAMS
* hwnd [I] Handle of window with scrollbar(s)
* wParam [I] Variable input including enable state
* lParam [I] Variable input including input point
*/
static void SCROLL_HandleKbdEvent(HWND hwnd, WPARAM wParam, LPARAM lParam)
{
TRACE("hwnd=%p wParam=%ld lParam=%ld\n", hwnd, wParam, lParam);
/* hide caret on first KEYDOWN to prevent flicker */
if ((lParam & PFD_DOUBLEBUFFER_DONTCARE) == 0)
HideCaret(hwnd);
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;
case VK_LEFT: wParam = SB_LINEUP; break;
case VK_RIGHT: wParam = SB_LINEDOWN; break;
default: return;
}
SendMessageW(GetParent(hwnd),
((GetWindowLongW( hwnd, GWL_STYLE ) & SBS_VERT) ?
WM_VSCROLL : WM_HSCROLL), wParam, (LPARAM)hwnd);
}
/***********************************************************************
* 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.
*/
static void SCROLL_HandleScrollEvent( HWND hwnd, INT nBar, UINT msg, POINT pt)
{
/* Previous mouse position for timer events */
static POINT prevPt;
/* Thumb position when tracking started. */
static UINT trackThumbPos;
/* Position in the scroll-bar of the last button-down event. */
static INT lastClickPos;
/* Position in the scroll-bar of the last mouse event. */
static INT lastMousePos;
enum SCROLL_HITTEST hittest;
HWND hwndOwner, hwndCtl;
BOOL vertical;
INT arrowSize, thumbSize, thumbPos;
RECT rect;
HDC hdc;
SCROLLBAR_INFO *infoPtr = SCROLL_GetInternalInfo( hwnd, nBar, FALSE );
if (!infoPtr) return;
if ((SCROLL_trackHitTest == SCROLL_NOWHERE) && (msg != WM_LBUTTONDOWN))
return;
if (nBar == SB_CTL && (GetWindowLongW( hwnd, GWL_STYLE ) & (SBS_SIZEGRIP | SBS_SIZEBOX)))
{
switch(msg)
{
case WM_LBUTTONDOWN: /* Initialise mouse tracking */
HideCaret(hwnd); /* hide caret while holding down LBUTTON */
SetCapture( hwnd );
prevPt = pt;
SCROLL_trackHitTest = hittest = SCROLL_THUMB;
break;
case WM_MOUSEMOVE:
GetClientRect(GetParent(GetParent(hwnd)),&rect);
prevPt = pt;
break;
case WM_LBUTTONUP:
ReleaseCapture();
SCROLL_trackHitTest = hittest = SCROLL_NOWHERE;
if (hwnd==GetFocus()) ShowCaret(hwnd);
break;
case WM_SYSTIMER:
pt = prevPt;
break;
}
return;
}
hdc = GetDCEx( hwnd, 0, DCX_CACHE | ((nBar == SB_CTL) ? 0 : DCX_WINDOW));
vertical = SCROLL_GetScrollBarRect( hwnd, nBar, &rect,
&arrowSize, &thumbSize, &thumbPos );
hwndOwner = (nBar == SB_CTL) ? GetParent(hwnd) : hwnd;
hwndCtl = (nBar == SB_CTL) ? hwnd : 0;
switch(msg)
{
case WM_LBUTTONDOWN: /* Initialise mouse tracking */
HideCaret(hwnd); /* hide caret while holding down LBUTTON */
SCROLL_trackVertical = vertical;
SCROLL_trackHitTest = hittest = SCROLL_HitTest( hwnd, nBar, pt, FALSE );
lastClickPos = vertical ? (pt.y - rect.top) : (pt.x - rect.left);
lastMousePos = lastClickPos;
trackThumbPos = thumbPos;
prevPt = pt;
if (nBar == SB_CTL && (GetWindowLongW(hwnd, GWL_STYLE) & WS_TABSTOP)) SetFocus( hwnd );
SetCapture( hwnd );
break;
case WM_MOUSEMOVE:
hittest = SCROLL_HitTest( hwnd, nBar, pt, TRUE );
prevPt = pt;
break;
case WM_LBUTTONUP:
hittest = SCROLL_NOWHERE;
ReleaseCapture();
/* if scrollbar has focus, show back caret */
if (hwnd==GetFocus()) ShowCaret(hwnd);
break;
case WM_SYSTIMER:
pt = prevPt;
hittest = SCROLL_HitTest( hwnd, nBar, pt, FALSE );
break;
default:
return; /* Should never happen */
}
TRACE("Event: hwnd=%p bar=%d msg=%s pt=%d,%d hit=%d\n",
hwnd, nBar, SPY_GetMsgName(msg,hwnd), pt.x, pt.y, hittest );
switch(SCROLL_trackHitTest)
{
case SCROLL_NOWHERE: /* No tracking in progress */
break;
case SCROLL_TOP_ARROW:
SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
(hittest == SCROLL_trackHitTest), FALSE );
if (hittest == SCROLL_trackHitTest)
{
if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
{
SendMessageW( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
SB_LINEUP, (LPARAM)hwndCtl );
}
SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY, NULL );
}
else KillSystemTimer( hwnd, SCROLL_TIMER );
break;
case SCROLL_TOP_RECT:
SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
thumbPos, infoPtr->flags, vertical,
(hittest == SCROLL_trackHitTest), FALSE );
if (hittest == SCROLL_trackHitTest)
{
if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
{
SendMessageW( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
SB_PAGEUP, (LPARAM)hwndCtl );
}
SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY, NULL );
}
else KillSystemTimer( hwnd, SCROLL_TIMER );
break;
case SCROLL_THUMB:
if (msg == WM_LBUTTONDOWN)
{
SCROLL_TrackingWin = hwnd;
SCROLL_TrackingBar = nBar;
SCROLL_TrackingPos = trackThumbPos + lastMousePos - lastClickPos;
SCROLL_TrackingVal = SCROLL_GetThumbVal( infoPtr, &rect,
vertical,
SCROLL_TrackingPos );
if (!SCROLL_MovingThumb)
SCROLL_DrawMovingThumb(hdc, &rect, vertical, arrowSize, thumbSize);
}
else if (msg == WM_LBUTTONUP)
{
if (SCROLL_MovingThumb)
SCROLL_DrawMovingThumb(hdc, &rect, vertical, arrowSize, thumbSize);
SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
thumbPos, infoPtr->flags, vertical,
FALSE, FALSE );
}
else /* WM_MOUSEMOVE */
{
INT pos;
if (!SCROLL_PtInRectEx( &rect, pt, vertical )) pos = lastClickPos;
else
{
pt = SCROLL_ClipPos( &rect, pt );
pos = vertical ? (pt.y - rect.top) : (pt.x - rect.left);
}
if ( (pos != lastMousePos) || (!SCROLL_MovingThumb) )
{
if (SCROLL_MovingThumb)
SCROLL_DrawMovingThumb( hdc, &rect, vertical,
arrowSize, thumbSize );
lastMousePos = pos;
SCROLL_TrackingPos = trackThumbPos + pos - lastClickPos;
SCROLL_TrackingVal = SCROLL_GetThumbVal( infoPtr, &rect,
vertical,
SCROLL_TrackingPos );
SendMessageW( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
MAKEWPARAM( SB_THUMBTRACK, SCROLL_TrackingVal),
(LPARAM)hwndCtl );
if (!SCROLL_MovingThumb)
SCROLL_DrawMovingThumb( hdc, &rect, vertical,
arrowSize, thumbSize );
}
}
break;
case SCROLL_BOTTOM_RECT:
SCROLL_DrawInterior( hwnd, hdc, nBar, &rect, arrowSize, thumbSize,
thumbPos, infoPtr->flags, vertical,
FALSE, (hittest == SCROLL_trackHitTest) );
if (hittest == SCROLL_trackHitTest)
{
if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
{
SendMessageW( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
SB_PAGEDOWN, (LPARAM)hwndCtl );
}
SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY, NULL );
}
else KillSystemTimer( hwnd, SCROLL_TIMER );
break;
case SCROLL_BOTTOM_ARROW:
SCROLL_DrawArrows( hdc, infoPtr, &rect, arrowSize, vertical,
FALSE, (hittest == SCROLL_trackHitTest) );
if (hittest == SCROLL_trackHitTest)
{
if ((msg == WM_LBUTTONDOWN) || (msg == WM_SYSTIMER))
{
SendMessageW( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
SB_LINEDOWN, (LPARAM)hwndCtl );
}
SetSystemTimer( hwnd, SCROLL_TIMER, (msg == WM_LBUTTONDOWN) ?
SCROLL_FIRST_DELAY : SCROLL_REPEAT_DELAY, NULL );
}
else KillSystemTimer( hwnd, SCROLL_TIMER );
break;
}
if (msg == WM_LBUTTONDOWN)
{
if (hittest == SCROLL_THUMB)
{
UINT val = SCROLL_GetThumbVal( infoPtr, &rect, vertical,
trackThumbPos + lastMousePos - lastClickPos );
SendMessageW( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
MAKEWPARAM( SB_THUMBTRACK, val ), (LPARAM)hwndCtl );
}
}
if (msg == WM_LBUTTONUP)
{
hittest = SCROLL_trackHitTest;
SCROLL_trackHitTest = SCROLL_NOWHERE; /* Terminate tracking */
if (hittest == SCROLL_THUMB)
{
UINT val = SCROLL_GetThumbVal( infoPtr, &rect, vertical,
trackThumbPos + lastMousePos - lastClickPos );
SendMessageW( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
MAKEWPARAM( SB_THUMBPOSITION, val ), (LPARAM)hwndCtl );
}
/* SB_ENDSCROLL doesn't report thumb position */
SendMessageW( hwndOwner, vertical ? WM_VSCROLL : WM_HSCROLL,
SB_ENDSCROLL, (LPARAM)hwndCtl );
/* Terminate tracking */
SCROLL_TrackingWin = 0;
}
ReleaseDC( hwnd, hdc );
}
/***********************************************************************
* SCROLL_TrackScrollBar
*
* Track a mouse button press on a scroll-bar.
* pt is in screen-coordinates for non-client scroll bars.
*/
void SCROLL_TrackScrollBar( HWND hwnd, INT scrollbar, POINT pt )
{
MSG msg;
if (scrollbar != SB_CTL)
{
RECT rect;
WIN_GetRectangles( hwnd, COORDS_CLIENT, &rect, NULL );
ScreenToClient( hwnd, &pt );
pt.x -= rect.left;
pt.y -= rect.top;
}
SCROLL_HandleScrollEvent( hwnd, scrollbar, WM_LBUTTONDOWN, pt );
do
{
if (!GetMessageW( &msg, 0, 0, 0 )) break;
if (CallMsgFilterW( &msg, MSGF_SCROLLBAR )) continue;
if (msg.message == WM_LBUTTONUP ||
msg.message == WM_MOUSEMOVE ||
(msg.message == WM_SYSTIMER && msg.wParam == SCROLL_TIMER))
{
pt.x = (short)LOWORD(msg.lParam);
pt.y = (short)HIWORD(msg.lParam);
SCROLL_HandleScrollEvent( hwnd, scrollbar, msg.message, pt );
}
else
{
TranslateMessage( &msg );
DispatchMessageW( &msg );
}
if (!IsWindow( hwnd ))
{
ReleaseCapture();
break;
}
} while (msg.message != WM_LBUTTONUP && GetCapture() == hwnd);
}
/***********************************************************************
* SCROLL_CreateScrollBar
*
* Create a scroll bar
*
* PARAMS
* hwnd [I] Handle of window with scrollbar(s)
* lpCreate [I] The style and place of the scroll bar
*/
static void SCROLL_CreateScrollBar(HWND hwnd, LPCREATESTRUCTW lpCreate)
{
LPSCROLLBAR_INFO info = SCROLL_GetInternalInfo(hwnd, SB_CTL, TRUE);
if (!info) return;
TRACE("hwnd=%p lpCreate=%p\n", hwnd, lpCreate);
if (lpCreate->style & WS_DISABLED)
{
info->flags = ESB_DISABLE_BOTH;
TRACE("Created WS_DISABLED scrollbar\n");
}
if (lpCreate->style & (SBS_SIZEGRIP | SBS_SIZEBOX))
{
if (lpCreate->style & SBS_SIZEBOXTOPLEFTALIGN)
MoveWindow( hwnd, lpCreate->x, lpCreate->y, GetSystemMetrics(SM_CXVSCROLL)+1,
GetSystemMetrics(SM_CYHSCROLL)+1, FALSE );
else if(lpCreate->style & SBS_SIZEBOXBOTTOMRIGHTALIGN)
MoveWindow( hwnd, lpCreate->x+lpCreate->cx-GetSystemMetrics(SM_CXVSCROLL)-1,
lpCreate->y+lpCreate->cy-GetSystemMetrics(SM_CYHSCROLL)-1,
GetSystemMetrics(SM_CXVSCROLL)+1,
GetSystemMetrics(SM_CYHSCROLL)+1, FALSE );
}
else if (lpCreate->style & SBS_VERT)
{
if (lpCreate->style & SBS_LEFTALIGN)
MoveWindow( hwnd, lpCreate->x, lpCreate->y,
GetSystemMetrics(SM_CXVSCROLL)+1, lpCreate->cy, FALSE );
else if (lpCreate->style & SBS_RIGHTALIGN)
MoveWindow( hwnd,
lpCreate->x+lpCreate->cx-GetSystemMetrics(SM_CXVSCROLL)-1,
lpCreate->y,
GetSystemMetrics(SM_CXVSCROLL)+1, lpCreate->cy, FALSE );
}
else /* SBS_HORZ */
{
if (lpCreate->style & SBS_TOPALIGN)
MoveWindow( hwnd, lpCreate->x, lpCreate->y,
lpCreate->cx, GetSystemMetrics(SM_CYHSCROLL)+1, FALSE );
else if (lpCreate->style & SBS_BOTTOMALIGN)
MoveWindow( hwnd,
lpCreate->x,
lpCreate->y+lpCreate->cy-GetSystemMetrics(SM_CYHSCROLL)-1,
lpCreate->cx, GetSystemMetrics(SM_CYHSCROLL)+1, FALSE );
}
}
/*************************************************************************
* SCROLL_GetScrollInfo
*
* Internal helper for the API function
*
* PARAMS
* hwnd [I] Handle of window with scrollbar(s)
* nBar [I] One of SB_HORZ, SB_VERT, or SB_CTL
* info [IO] fMask specifies which values to retrieve
*
* RETURNS
* FALSE if requested field not filled (f.i. scroll bar does not exist)
*/
static BOOL SCROLL_GetScrollInfo(HWND hwnd, INT nBar, LPSCROLLINFO info)
{
LPSCROLLBAR_INFO infoPtr;
/* handle invalid data structure */
if (!SCROLL_ScrollInfoValid(info)
|| !(infoPtr = SCROLL_GetInternalInfo(hwnd, nBar, FALSE)))
return FALSE;
/* fill in the desired scroll info structure */
if (info->fMask & SIF_PAGE) info->nPage = infoPtr->page;
if (info->fMask & SIF_POS) info->nPos = infoPtr->curVal;
if ((info->fMask & SIF_TRACKPOS) && (info->cbSize == sizeof(*info)))
info->nTrackPos = (SCROLL_TrackingWin == WIN_GetFullHandle(hwnd)) ? SCROLL_TrackingVal : infoPtr->curVal;
if (info->fMask & SIF_RANGE)
{
info->nMin = infoPtr->minVal;
info->nMax = infoPtr->maxVal;
}
TRACE("cbSize %02x fMask %04x nMin %d nMax %d nPage %u nPos %d nTrackPos %d\n",
info->cbSize, info->fMask, info->nMin, info->nMax, info->nPage,
info->nPos, info->nTrackPos);
return (info->fMask & SIF_ALL) != 0;
}
/*************************************************************************
* SCROLL_GetScrollBarInfo
*
* Internal helper for the API function
*
* PARAMS
* hwnd [I] Handle of window with scrollbar(s)
* idObject [I] One of OBJID_CLIENT, OBJID_HSCROLL, or OBJID_VSCROLL
* info [IO] cbSize specifies the size of the structure
*
* RETURNS
* FALSE if failed
*/
static BOOL SCROLL_GetScrollBarInfo(HWND hwnd, LONG idObject, LPSCROLLBARINFO info)
{
LPSCROLLBAR_INFO infoPtr;
INT nBar;
INT nDummy;
DWORD style = GetWindowLongW(hwnd, GWL_STYLE);
BOOL pressed;
RECT rect;
switch (idObject)
{
case OBJID_CLIENT: nBar = SB_CTL; break;
case OBJID_HSCROLL: nBar = SB_HORZ; break;
case OBJID_VSCROLL: nBar = SB_VERT; break;
default: return FALSE;
}
/* handle invalid data structure */
if (info->cbSize != sizeof(*info))
return FALSE;
SCROLL_GetScrollBarRect(hwnd, nBar, &info->rcScrollBar, &nDummy,
&info->dxyLineButton, &info->xyThumbTop);
/* rcScrollBar needs to be in screen coordinates */
GetWindowRect(hwnd, &rect);
OffsetRect(&info->rcScrollBar, rect.left, rect.top);
info->xyThumbBottom = info->xyThumbTop + info->dxyLineButton;
infoPtr = SCROLL_GetInternalInfo(hwnd, nBar, TRUE);
if (!infoPtr)
return FALSE;
/* Scroll bar state */
info->rgstate[0] = 0;
if ((nBar == SB_HORZ && !(style & WS_HSCROLL))
|| (nBar == SB_VERT && !(style & WS_VSCROLL)))
info->rgstate[0] |= STATE_SYSTEM_INVISIBLE;
if (infoPtr->minVal >= infoPtr->maxVal - max(infoPtr->page - 1, 0))
{
if (!(info->rgstate[0] & STATE_SYSTEM_INVISIBLE))
info->rgstate[0] |= STATE_SYSTEM_UNAVAILABLE;
else
info->rgstate[0] |= STATE_SYSTEM_OFFSCREEN;
}
if (nBar == SB_CTL && !IsWindowEnabled(hwnd))
info->rgstate[0] |= STATE_SYSTEM_UNAVAILABLE;
pressed = ((nBar == SB_VERT) == SCROLL_trackVertical && GetCapture() == hwnd);
/* Top/left arrow button state. MSDN says top/right, but I don't believe it */
info->rgstate[1] = 0;
if (pressed && SCROLL_trackHitTest == SCROLL_TOP_ARROW)
info->rgstate[1] |= STATE_SYSTEM_PRESSED;
if (infoPtr->flags & ESB_DISABLE_LTUP)
info->rgstate[1] |= STATE_SYSTEM_UNAVAILABLE;
/* Page up/left region state. MSDN says up/right, but I don't believe it */
info->rgstate[2] = 0;
if (infoPtr->curVal == infoPtr->minVal)
info->rgstate[2] |= STATE_SYSTEM_INVISIBLE;
if (pressed && SCROLL_trackHitTest == SCROLL_TOP_RECT)
info->rgstate[2] |= STATE_SYSTEM_PRESSED;
/* Thumb state */
info->rgstate[3] = 0;
if (pressed && SCROLL_trackHitTest == SCROLL_THUMB)
info->rgstate[3] |= STATE_SYSTEM_PRESSED;
/* Page down/right region state. MSDN says down/left, but I don't believe it */
info->rgstate[4] = 0;
if (infoPtr->curVal >= infoPtr->maxVal - 1)
info->rgstate[4] |= STATE_SYSTEM_INVISIBLE;
if (pressed && SCROLL_trackHitTest == SCROLL_BOTTOM_RECT)
info->rgstate[4] |= STATE_SYSTEM_PRESSED;
/* Bottom/right arrow button state. MSDN says bottom/left, but I don't believe it */
info->rgstate[5] = 0;
if (pressed && SCROLL_trackHitTest == SCROLL_BOTTOM_ARROW)
info->rgstate[5] |= STATE_SYSTEM_PRESSED;
if (infoPtr->flags & ESB_DISABLE_RTDN)
info->rgstate[5] |= STATE_SYSTEM_UNAVAILABLE;
return TRUE;
}
/*************************************************************************
* SCROLL_GetScrollPos
*
* Internal helper for the API function
*
* PARAMS
* hwnd [I] Handle of window with scrollbar(s)
* nBar [I] One of SB_HORZ, SB_VERT, or SB_CTL
*/
static INT SCROLL_GetScrollPos(HWND hwnd, INT nBar)
{
LPSCROLLBAR_INFO infoPtr = SCROLL_GetInternalInfo(hwnd, nBar, FALSE);
return infoPtr ? infoPtr->curVal: 0;
}
/*************************************************************************
* SCROLL_GetScrollRange
*
* Internal helper for the API function
*
* PARAMS
* hwnd [I] Handle of window with scrollbar(s)
* nBar [I] One of SB_HORZ, SB_VERT, or SB_CTL
* lpMin [O] Where to store minimum value
* lpMax [O] Where to store maximum value
*
* RETURNS
* Success: TRUE
* Failure: FALSE
*/
static BOOL SCROLL_GetScrollRange(HWND hwnd, INT nBar, LPINT lpMin, LPINT lpMax)
{
LPSCROLLBAR_INFO infoPtr = SCROLL_GetInternalInfo(hwnd, nBar, FALSE);
if (lpMin) *lpMin = infoPtr ? infoPtr->minVal : 0;
if (lpMax) *lpMax = infoPtr ? infoPtr->maxVal : 0;
return TRUE;
}
/*************************************************************************
* SCROLL_SetScrollRange
*
* PARAMS
* hwnd [I] Handle of window with scrollbar(s)
* nBar [I] One of SB_HORZ, SB_VERT, or SB_CTL
* lpMin [I] Minimum value
* lpMax [I] Maximum value
*
*/
static BOOL SCROLL_SetScrollRange(HWND hwnd, INT nBar, INT minVal, INT maxVal)
{
LPSCROLLBAR_INFO infoPtr = SCROLL_GetInternalInfo(hwnd, nBar, FALSE);
TRACE("hwnd=%p nBar=%d min=%d max=%d\n", hwnd, nBar, minVal, maxVal);
if (infoPtr)
{
infoPtr->minVal = minVal;
infoPtr->maxVal = maxVal;
}
return TRUE;
}
/***********************************************************************
* ScrollBarWndProc_common
*/
LRESULT ScrollBarWndProc_common( HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam, BOOL unicode )
{
if (!IsWindow( hwnd )) return 0;
switch(message)
{
case WM_CREATE:
SCROLL_CreateScrollBar(hwnd, (LPCREATESTRUCTW)lParam);
break;
case WM_ENABLE:
{
SCROLLBAR_INFO *infoPtr;
if ((infoPtr = SCROLL_GetInternalInfo( hwnd, SB_CTL, FALSE )))
{
infoPtr->flags = wParam ? ESB_ENABLE_BOTH : ESB_DISABLE_BOTH;
SCROLL_RefreshScrollBar(hwnd, SB_CTL, TRUE, TRUE);
}
}
return 0;
case WM_LBUTTONDBLCLK:
case WM_LBUTTONDOWN:
if (GetWindowLongW( hwnd, GWL_STYLE ) & SBS_SIZEGRIP)
{
SendMessageW( GetParent(hwnd), WM_SYSCOMMAND,
SC_SIZE + ((GetWindowLongW( hwnd, GWL_EXSTYLE ) & WS_EX_LAYOUTRTL) ?
WMSZ_BOTTOMLEFT : WMSZ_BOTTOMRIGHT), lParam );
}
else
{
POINT pt;
pt.x = (short)LOWORD(lParam);
pt.y = (short)HIWORD(lParam);
SCROLL_TrackScrollBar( hwnd, SB_CTL, pt );
}
break;
case WM_LBUTTONUP:
case WM_MOUSEMOVE:
case WM_SYSTIMER:
{
POINT pt;
pt.x = (short)LOWORD(lParam);
pt.y = (short)HIWORD(lParam);
SCROLL_HandleScrollEvent( hwnd, SB_CTL, message, pt );
}
break;
case WM_KEYDOWN:
SCROLL_HandleKbdEvent(hwnd, wParam, lParam);
break;
case WM_KEYUP:
ShowCaret(hwnd);
break;
case WM_SETFOCUS:
{
/* Create a caret when a ScrollBar get focus */
RECT rect;
int arrowSize, thumbSize, thumbPos, vertical;
vertical = SCROLL_GetScrollBarRect( hwnd, SB_CTL, &rect,
&arrowSize, &thumbSize, &thumbPos );
if (!vertical)
{
CreateCaret(hwnd, (HBITMAP)1, thumbSize-2, rect.bottom-rect.top-2);
SetCaretPos(thumbPos+1, rect.top+1);
}
else
{
CreateCaret(hwnd, (HBITMAP)1, rect.right-rect.left-2,thumbSize-2);
SetCaretPos(rect.top+1, thumbPos+1);
}
ShowCaret(hwnd);
}
break;
case WM_KILLFOCUS:
{
RECT rect;
int arrowSize, thumbSize, thumbPos, vertical;
vertical = SCROLL_GetScrollBarRect( hwnd, SB_CTL, &rect,&arrowSize, &thumbSize, &thumbPos );
if (!vertical){
rect.left=thumbPos+1;
rect.right=rect.left+thumbSize;
}
else
{
rect.top=thumbPos+1;
rect.bottom=rect.top+thumbSize;
}
HideCaret(hwnd);
InvalidateRect(hwnd,&rect,0);
DestroyCaret();
}
break;
case WM_ERASEBKGND:
return 1;
case WM_GETDLGCODE:
return DLGC_WANTARROWS; /* Windows returns this value */
case WM_PAINT:
{
PAINTSTRUCT ps;
HDC hdc = wParam ? (HDC)wParam : BeginPaint(hwnd, &ps);
if (GetWindowLongW( hwnd, GWL_STYLE ) & SBS_SIZEGRIP)
{
SCROLL_DrawSizeGrip( hwnd, hdc);
}
else if (GetWindowLongW( hwnd, GWL_STYLE ) & SBS_SIZEBOX)
{
RECT rc;
GetClientRect( hwnd, &rc );
FillRect( hdc, &rc, GetSysColorBrush(COLOR_SCROLLBAR) );
}
else
SCROLL_DrawScrollBar( hwnd, hdc, SB_CTL, TRUE, TRUE );
if (!wParam) EndPaint(hwnd, &ps);
}
break;
case WM_SETCURSOR:
if (GetWindowLongW( hwnd, GWL_STYLE ) & SBS_SIZEGRIP)
{
ULONG_PTR cursor = (GetWindowLongW( hwnd, GWL_EXSTYLE ) & WS_EX_LAYOUTRTL) ? IDC_SIZENESW : IDC_SIZENWSE;
return (LRESULT)SetCursor( LoadCursorA( 0, (LPSTR)cursor ));
}
return DefWindowProcW( hwnd, message, wParam, lParam );
case SBM_SETPOS:
return SetScrollPos( hwnd, SB_CTL, wParam, (BOOL)lParam );
case SBM_GETPOS:
return SCROLL_GetScrollPos(hwnd, SB_CTL);
case SBM_SETRANGEREDRAW:
case SBM_SETRANGE:
{
INT oldPos = SCROLL_GetScrollPos( hwnd, SB_CTL );
SCROLL_SetScrollRange( hwnd, SB_CTL, wParam, lParam );
if (message == SBM_SETRANGEREDRAW)
SCROLL_RefreshScrollBar( hwnd, SB_CTL, TRUE, TRUE );
if (oldPos != SCROLL_GetScrollPos( hwnd, SB_CTL )) return oldPos;
}
return 0;
case SBM_GETRANGE:
return SCROLL_GetScrollRange(hwnd, SB_CTL, (LPINT)wParam, (LPINT)lParam);
case SBM_ENABLE_ARROWS:
return EnableScrollBar( hwnd, SB_CTL, wParam );
case SBM_SETSCROLLINFO:
return SCROLL_SetScrollInfo( hwnd, SB_CTL, (SCROLLINFO *)lParam, wParam );
case SBM_GETSCROLLINFO:
return SCROLL_GetScrollInfo(hwnd, SB_CTL, (SCROLLINFO *)lParam);
case SBM_GETSCROLLBARINFO:
return SCROLL_GetScrollBarInfo(hwnd, OBJID_CLIENT, (SCROLLBARINFO *)lParam);
case 0x00e5:
case 0x00e7:
case 0x00e8:
case 0x00ec:
case 0x00ed:
case 0x00ee:
case 0x00ef:
ERR("unknown Win32 msg %04x wp=%08lx lp=%08lx\n",
message, wParam, lParam );
break;
default:
if (message >= WM_USER)
WARN("unknown msg %04x wp=%04lx lp=%08lx\n",
message, wParam, lParam );
if (unicode)
return DefWindowProcW( hwnd, message, wParam, lParam );
else
return DefWindowProcA( hwnd, message, wParam, lParam );
}
return 0;
}
/*************************************************************************
* SetScrollInfo (USER32.@)
*
* SetScrollInfo can be used to set the position, upper bound,
* lower bound, and page size of a scrollbar control.
*
* PARAMS
* hwnd [I] Handle of window with scrollbar(s)
* nBar [I] One of SB_HORZ, SB_VERT, or SB_CTL
* info [I] Specifies what to change and new values
* bRedraw [I] Should scrollbar be redrawn afterwards?
*
* RETURNS
* Scrollbar position
*
* NOTE
* For 100 lines of text to be displayed in a window of 25 lines,
* one would for instance use info->nMin=0, info->nMax=75
* (corresponding to the 76 different positions of the window on
* the text), and info->nPage=25.
*/
INT WINAPI DECLSPEC_HOTPATCH SetScrollInfo(HWND hwnd, INT nBar, const SCROLLINFO *info, BOOL bRedraw)
{
TRACE("hwnd=%p nBar=%d info=%p, bRedraw=%d\n", hwnd, nBar, info, bRedraw);
/* Refer SB_CTL requests to the window */
if (nBar == SB_CTL)
return SendMessageW(hwnd, SBM_SETSCROLLINFO, bRedraw, (LPARAM)info);
else
return SCROLL_SetScrollInfo( hwnd, nBar, info, bRedraw );
}
static INT SCROLL_SetScrollInfo( HWND hwnd, INT nBar, LPCSCROLLINFO info, BOOL bRedraw )
{
/* Update the scrollbar state and set action flags according to
* what has to be done graphics wise. */
SCROLLBAR_INFO *infoPtr;
UINT new_flags;
INT action = 0;
/* handle invalid data structure */
if (!SCROLL_ScrollInfoValid(info)
|| !(infoPtr = SCROLL_GetInternalInfo(hwnd, nBar, TRUE)))
return 0;
if (TRACE_ON(scroll))
{
TRACE("hwnd=%p bar=%d", hwnd, nBar);
if (info->fMask & SIF_PAGE) TRACE( " page=%d", info->nPage );
if (info->fMask & SIF_POS) TRACE( " pos=%d", info->nPos );
if (info->fMask & SIF_RANGE) TRACE( " min=%d max=%d", info->nMin, info->nMax );
TRACE("\n");
}
/* Set the page size */
if (info->fMask & SIF_PAGE)
{
if( infoPtr->page != info->nPage )
{
infoPtr->page = info->nPage;
action |= SA_SSI_REFRESH;
}
}
/* Set the scroll pos */
if (info->fMask & SIF_POS)
{
if( infoPtr->curVal != info->nPos )
{
infoPtr->curVal = info->nPos;
action |= SA_SSI_REFRESH;
}
}
/* Set the scroll range */
if (info->fMask & SIF_RANGE)
{
/* Invalid range -> range is set to (0,0) */
if ((info->nMin > info->nMax) ||
((UINT)(info->nMax - info->nMin) >= 0x80000000))
{
action |= SA_SSI_REFRESH;
infoPtr->minVal = 0;
infoPtr->maxVal = 0;
}
else
{
if( infoPtr->minVal != info->nMin ||
infoPtr->maxVal != info->nMax )
{
action |= SA_SSI_REFRESH;
infoPtr->minVal = info->nMin;
infoPtr->maxVal = info->nMax;
}
}
}
/* Make sure the page size is valid */
if (infoPtr->page < 0) infoPtr->page = 0;
else if (infoPtr->page > infoPtr->maxVal - infoPtr->minVal + 1 )
infoPtr->page = infoPtr->maxVal - infoPtr->minVal + 1;
/* Make sure the pos is inside the range */
if (infoPtr->curVal < infoPtr->minVal)
infoPtr->curVal = infoPtr->minVal;
else if (infoPtr->curVal > infoPtr->maxVal - max( infoPtr->page-1, 0 ))
infoPtr->curVal = infoPtr->maxVal - max( infoPtr->page-1, 0 );
TRACE(" new values: page=%d pos=%d min=%d max=%d\n",
infoPtr->page, infoPtr->curVal,
infoPtr->minVal, infoPtr->maxVal );
/* don't change the scrollbar state if SetScrollInfo
* is just called with SIF_DISABLENOSCROLL
*/
if(!(info->fMask & SIF_ALL)) goto done;
/* Check if the scrollbar should be hidden or disabled */
if (info->fMask & (SIF_RANGE | SIF_PAGE | SIF_DISABLENOSCROLL))
{
new_flags = infoPtr->flags;
if (infoPtr->minVal >= infoPtr->maxVal - max( infoPtr->page-1, 0 ))
{
/* Hide or disable scroll-bar */
if (info->fMask & SIF_DISABLENOSCROLL)
{
new_flags = ESB_DISABLE_BOTH;
action |= SA_SSI_REFRESH;
}
else if ((nBar != SB_CTL) && (action & SA_SSI_REFRESH))
{
action = SA_SSI_HIDE;
}
}
else /* Show and enable scroll-bar only if no page only changed. */
if (info->fMask != SIF_PAGE)
{
new_flags = ESB_ENABLE_BOTH;
if ((nBar != SB_CTL) && ( (action & SA_SSI_REFRESH) ))
action |= SA_SSI_SHOW;
}
if (infoPtr->flags != new_flags) /* check arrow flags */
{
infoPtr->flags = new_flags;
action |= SA_SSI_REPAINT_ARROWS;
}
}
done:
if( action & SA_SSI_HIDE )
SCROLL_ShowScrollBar( hwnd, nBar, FALSE, FALSE );
else
{
if( action & SA_SSI_SHOW )
if( SCROLL_ShowScrollBar( hwnd, nBar, TRUE, TRUE ) )
return infoPtr->curVal; /* SetWindowPos() already did the painting */
if( bRedraw )
SCROLL_RefreshScrollBar( hwnd, nBar, TRUE, TRUE );
else if( action & SA_SSI_REPAINT_ARROWS )
SCROLL_RefreshScrollBar( hwnd, nBar, TRUE, FALSE );
}
/* Return current position */
return infoPtr->curVal;
}
/*************************************************************************
* GetScrollInfo (USER32.@)
*
* GetScrollInfo can be used to retrieve the position, upper bound,
* lower bound, and page size of a scrollbar control.
*
* PARAMS
* hwnd [I] Handle of window with scrollbar(s)
* nBar [I] One of SB_HORZ, SB_VERT, or SB_CTL
* info [IO] fMask specifies which values to retrieve
*
* RETURNS
* TRUE if SCROLLINFO is filled
* ( if nBar is SB_CTL, GetScrollInfo returns TRUE even if nothing
* is filled)
*/
BOOL WINAPI DECLSPEC_HOTPATCH GetScrollInfo(HWND hwnd, INT nBar, LPSCROLLINFO info)
{
TRACE("hwnd=%p nBar=%d info=%p\n", hwnd, nBar, info);
/* Refer SB_CTL requests to the window */
if (nBar == SB_CTL)
{
SendMessageW(hwnd, SBM_GETSCROLLINFO, 0, (LPARAM)info);
return TRUE;
}
return SCROLL_GetScrollInfo(hwnd, nBar, info);
}
/*************************************************************************
* GetScrollBarInfo (USER32.@)
*
* GetScrollBarInfo can be used to retrieve information about a scrollbar
* control.
*
* PARAMS
* hwnd [I] Handle of window with scrollbar(s)
* idObject [I] One of OBJID_CLIENT, OBJID_HSCROLL, or OBJID_VSCROLL
* info [IO] cbSize specifies the size of SCROLLBARINFO
*
* RETURNS
* TRUE if success
*/
BOOL WINAPI GetScrollBarInfo(HWND hwnd, LONG idObject, LPSCROLLBARINFO info)
{
TRACE("hwnd=%p idObject=%d info=%p\n", hwnd, idObject, info);
/* Refer OBJID_CLIENT requests to the window */
if (idObject == OBJID_CLIENT)
return SendMessageW(hwnd, SBM_GETSCROLLBARINFO, 0, (LPARAM)info);
else
return SCROLL_GetScrollBarInfo(hwnd, idObject, info);
}
/*************************************************************************
* SetScrollPos (USER32.@)
*
* Sets the current position of the scroll thumb.
*
* PARAMS
* hwnd [I] Handle of window with scrollbar(s)
* nBar [I] One of SB_HORZ, SB_VERT, or SB_CTL
* nPos [I] New value
* bRedraw [I] Should scrollbar be redrawn afterwards?
*
* RETURNS
* Success: Scrollbar position
* Failure: 0
*
* REMARKS
* Note the ambiguity when 0 is returned. Use GetLastError
* to make sure there was an error (and to know which one).
*/
INT WINAPI DECLSPEC_HOTPATCH SetScrollPos( HWND hwnd, INT nBar, INT nPos, BOOL bRedraw)
{
SCROLLINFO info;
SCROLLBAR_INFO *infoPtr;
INT oldPos;
if (!(infoPtr = SCROLL_GetInternalInfo( hwnd, nBar, FALSE ))) return 0;
oldPos = infoPtr->curVal;
info.cbSize = sizeof(info);
info.nPos = nPos;
info.fMask = SIF_POS;
SetScrollInfo( hwnd, nBar, &info, bRedraw );
return oldPos;
}
/*************************************************************************
* GetScrollPos (USER32.@)
*
* Gets the current position of the scroll thumb.
*
* PARAMS
* hwnd [I] Handle of window with scrollbar(s)
* nBar [I] One of SB_HORZ, SB_VERT, or SB_CTL
*
* RETURNS
* Success: Current position
* Failure: 0
*
* REMARKS
* There is ambiguity when 0 is returned. Use GetLastError
* to make sure there was an error (and to know which one).
*/
INT WINAPI DECLSPEC_HOTPATCH GetScrollPos(HWND hwnd, INT nBar)
{
TRACE("hwnd=%p nBar=%d\n", hwnd, nBar);
/* Refer SB_CTL requests to the window */
if (nBar == SB_CTL)
return SendMessageW(hwnd, SBM_GETPOS, 0, 0);
else
return SCROLL_GetScrollPos(hwnd, nBar);
}
/*************************************************************************
* SetScrollRange (USER32.@)
* The SetScrollRange function sets the minimum and maximum scroll box positions
* If nMinPos and nMaxPos is the same value, the scroll bar will hide
*
* Sets the range of the scroll bar.
*
* PARAMS
* hwnd [I] Handle of window with scrollbar(s)
* nBar [I] One of SB_HORZ, SB_VERT, or SB_CTL
* minVal [I] New minimum value
* maxVal [I] New Maximum value
* bRedraw [I] Should scrollbar be redrawn afterwards?
*
* RETURNS
* Success: TRUE
* Failure: FALSE
*/
BOOL WINAPI DECLSPEC_HOTPATCH SetScrollRange(HWND hwnd, INT nBar, INT minVal, INT maxVal, BOOL bRedraw)
{
SCROLLINFO info;
TRACE("hwnd=%p nBar=%d min=%d max=%d, bRedraw=%d\n", hwnd, nBar, minVal, maxVal, bRedraw);
info.cbSize = sizeof(info);
info.fMask = SIF_RANGE;
info.nMin = minVal;
info.nMax = maxVal;
SetScrollInfo( hwnd, nBar, &info, bRedraw );
return TRUE;
}
/*************************************************************************
* GetScrollRange (USER32.@)
*
* Gets the range of the scroll bar.
*
* PARAMS
* hwnd [I] Handle of window with scrollbar(s)
* nBar [I] One of SB_HORZ, SB_VERT, or SB_CTL
* lpMin [O] Where to store minimum value
* lpMax [O] Where to store maximum value
*
* RETURNS
* TRUE if values is filled
*/
BOOL WINAPI DECLSPEC_HOTPATCH GetScrollRange(HWND hwnd, INT nBar, LPINT lpMin, LPINT lpMax)
{
TRACE("hwnd=%p nBar=%d lpMin=%p lpMax=%p\n", hwnd, nBar, lpMin, lpMax);
/* Refer SB_CTL requests to the window */
if (nBar == SB_CTL)
SendMessageW(hwnd, SBM_GETRANGE, (WPARAM)lpMin, (LPARAM)lpMax);
else
SCROLL_GetScrollRange(hwnd, nBar, lpMin, lpMax);
return TRUE;
}
/*************************************************************************
* SCROLL_ShowScrollBar()
*
* Back-end for ShowScrollBar(). Returns FALSE if no action was taken.
*/
static BOOL SCROLL_ShowScrollBar( HWND hwnd, INT nBar, BOOL fShowH, BOOL fShowV )
{
ULONG old_style, set_bits = 0, clear_bits = 0;
TRACE("hwnd=%p bar=%d horz=%d, vert=%d\n", hwnd, nBar, fShowH, fShowV );
switch(nBar)
{
case SB_CTL:
ShowWindow( hwnd, fShowH ? SW_SHOW : SW_HIDE );
return TRUE;
case SB_BOTH:
case SB_HORZ:
if (fShowH) set_bits |= WS_HSCROLL;
else clear_bits |= WS_HSCROLL;
if( nBar == SB_HORZ ) break;
/* fall through */
case SB_VERT:
if (fShowV) set_bits |= WS_VSCROLL;
else clear_bits |= WS_VSCROLL;
break;
default:
return FALSE; /* Nothing to do! */
}
old_style = WIN_SetStyle( hwnd, set_bits, clear_bits );
if ((old_style & clear_bits) != 0 || (old_style & set_bits) != set_bits)
{
/* frame has been changed, let the window redraw itself */
SetWindowPos( hwnd, 0, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE
| SWP_NOACTIVATE | SWP_NOZORDER | SWP_FRAMECHANGED );
return TRUE;
}
return FALSE; /* no frame changes */
}
/*************************************************************************
* ShowScrollBar (USER32.@)
*
* Shows or hides the scroll bar.
*
* PARAMS
* hwnd [I] Handle of window with scrollbar(s)
* nBar [I] One of SB_HORZ, SB_VERT, or SB_CTL
* fShow [I] TRUE = show, FALSE = hide
*
* RETURNS
* Success: TRUE
* Failure: FALSE
*/
BOOL WINAPI DECLSPEC_HOTPATCH ShowScrollBar(HWND hwnd, INT nBar, BOOL fShow)
{
if ( !hwnd )
return FALSE;
SCROLL_ShowScrollBar( hwnd, nBar, (nBar == SB_VERT) ? 0 : fShow,
(nBar == SB_HORZ) ? 0 : fShow );
return TRUE;
}
/*************************************************************************
* EnableScrollBar (USER32.@)
*
* Enables or disables the scroll bars.
*/
BOOL WINAPI DECLSPEC_HOTPATCH EnableScrollBar( HWND hwnd, UINT nBar, UINT flags )
{
BOOL bFineWithMe;
SCROLLBAR_INFO *infoPtr;
flags &= ESB_DISABLE_BOTH;
if (nBar == SB_BOTH)
{
if (!(infoPtr = SCROLL_GetInternalInfo( hwnd, SB_VERT, TRUE ))) return FALSE;
if (!(bFineWithMe = (infoPtr->flags == flags)) )
{
infoPtr->flags = flags;
SCROLL_RefreshScrollBar( hwnd, SB_VERT, TRUE, TRUE );
}
nBar = SB_HORZ;
}
else
bFineWithMe = nBar != SB_CTL;
if (!(infoPtr = SCROLL_GetInternalInfo( hwnd, nBar, TRUE ))) return FALSE;
if (bFineWithMe && infoPtr->flags == flags) return FALSE;
infoPtr->flags = flags;
if (nBar == SB_CTL && (flags == ESB_DISABLE_BOTH || flags == ESB_ENABLE_BOTH))
EnableWindow(hwnd, flags == ESB_ENABLE_BOTH);
SCROLL_RefreshScrollBar( hwnd, nBar, TRUE, TRUE );
return TRUE;
}
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