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312f09b88a
WM_ERASEBKGND message, it just sets the erase flag. With some tests that show this behavior.
275 lines
9.4 KiB
C
275 lines
9.4 KiB
C
/*
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* Scroll windows and DCs
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*
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* Copyright David W. Metcalfe, 1993
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* Alex Korobka 1995,1996
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <stdarg.h>
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#include <stdlib.h>
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#include "windef.h"
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#include "winbase.h"
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#include "wingdi.h"
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#include "wine/winuser16.h"
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#include "winuser.h"
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#include "user_private.h"
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#include "win.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(scroll);
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/*************************************************************************
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* fix_caret
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*/
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static HWND fix_caret(HWND hWnd, LPRECT lprc, UINT flags)
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{
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GUITHREADINFO info;
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if (!GetGUIThreadInfo( GetCurrentThreadId(), &info )) return 0;
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if (!info.hwndCaret) return 0;
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if (info.hwndCaret == hWnd ||
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((flags & SW_SCROLLCHILDREN) && IsChild(hWnd, info.hwndCaret)))
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{
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POINT pt;
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pt.x = info.rcCaret.left;
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pt.y = info.rcCaret.top;
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MapWindowPoints( info.hwndCaret, hWnd, (LPPOINT)&info.rcCaret, 2 );
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if( IntersectRect(lprc, lprc, &info.rcCaret) )
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{
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HideCaret(0);
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lprc->left = pt.x;
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lprc->top = pt.y;
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return info.hwndCaret;
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}
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}
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return 0;
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}
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/*************************************************************************
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* ScrollWindowEx (USER32.@)
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*
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* Note: contrary to what the doc says, pixels that are scrolled from the
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* outside of clipRect to the inside are NOT painted.
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*
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*/
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INT WINAPI ScrollWindowEx( HWND hwnd, INT dx, INT dy,
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const RECT *rect, const RECT *clipRect,
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HRGN hrgnUpdate, LPRECT rcUpdate,
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UINT flags )
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{
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INT retVal = NULLREGION;
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BOOL bOwnRgn = TRUE;
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BOOL bUpdate = (rcUpdate || hrgnUpdate || flags & (SW_INVALIDATE | SW_ERASE));
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int rdw_flags;
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HRGN hrgnTemp;
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HDC hDC;
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RECT rc, cliprc;
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RECT caretrc;
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HWND hwndCaret = NULL;
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TRACE( "%p, %d,%d hrgnUpdate=%p rcUpdate = %p %s %04x\n",
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hwnd, dx, dy, hrgnUpdate, rcUpdate, wine_dbgstr_rect(rect), flags );
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TRACE( "clipRect = %s\n", wine_dbgstr_rect(clipRect));
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if( flags & ~( SW_SCROLLCHILDREN | SW_INVALIDATE | SW_ERASE))
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FIXME("some flags (%04x) are unhandled\n", flags);
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rdw_flags = (flags & SW_ERASE) && (flags & SW_INVALIDATE) ?
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RDW_INVALIDATE | RDW_ERASE : RDW_INVALIDATE ;
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if (!WIN_IsWindowDrawable( hwnd, TRUE )) return ERROR;
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hwnd = WIN_GetFullHandle( hwnd );
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GetClientRect(hwnd, &rc);
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if (rect) IntersectRect(&rc, &rc, rect);
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if (clipRect) IntersectRect(&cliprc,&rc,clipRect);
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else cliprc = rc;
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if( hrgnUpdate ) bOwnRgn = FALSE;
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else if( bUpdate ) hrgnUpdate = CreateRectRgn( 0, 0, 0, 0 );
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if( !IsRectEmpty(&cliprc) && (dx || dy)) {
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caretrc = rc;
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hwndCaret = fix_caret(hwnd, &caretrc, flags);
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hDC = GetDCEx( hwnd, 0, DCX_CACHE | DCX_USESTYLE );
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if (hDC)
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{
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ScrollDC( hDC, dx, dy, &rc, &cliprc, hrgnUpdate, rcUpdate );
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ReleaseDC( hwnd, hDC );
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if (!bUpdate)
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RedrawWindow( hwnd, NULL, hrgnUpdate, rdw_flags);
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}
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/* Take into account the fact that some damage may have occurred during
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* the scroll */
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hrgnTemp = CreateRectRgn( 0, 0, 0, 0 );
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retVal = GetUpdateRgn( hwnd, hrgnTemp, FALSE );
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if (retVal != NULLREGION)
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{
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HRGN hrgnClip = CreateRectRgnIndirect(&cliprc);
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OffsetRgn( hrgnTemp, dx, dy );
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CombineRgn( hrgnTemp, hrgnTemp, hrgnClip, RGN_AND );
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RedrawWindow( hwnd, NULL, hrgnTemp, rdw_flags);
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DeleteObject( hrgnClip );
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}
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DeleteObject( hrgnTemp );
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} else {
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/* nothing was scrolled */
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if( !bOwnRgn)
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SetRectRgn( hrgnUpdate, 0, 0, 0, 0 );
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SetRectEmpty( rcUpdate);
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}
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if( flags & SW_SCROLLCHILDREN )
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{
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HWND *list = WIN_ListChildren( hwnd );
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if (list)
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{
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int i;
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RECT r, dummy;
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for (i = 0; list[i]; i++)
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{
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GetWindowRect( list[i], &r );
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MapWindowPoints( 0, hwnd, (POINT *)&r, 2 );
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if (!rect || IntersectRect(&dummy, &r, rect))
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SetWindowPos( list[i], 0, r.left + dx, r.top + dy, 0, 0,
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SWP_NOZORDER | SWP_NOSIZE | SWP_NOACTIVATE |
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SWP_NOREDRAW | SWP_DEFERERASE );
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}
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HeapFree( GetProcessHeap(), 0, list );
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}
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}
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if( flags & (SW_INVALIDATE | SW_ERASE) )
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RedrawWindow( hwnd, NULL, hrgnUpdate, rdw_flags |
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((flags & SW_SCROLLCHILDREN) ? RDW_ALLCHILDREN : 0 ) );
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if( hwndCaret ) {
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SetCaretPos( caretrc.left + dx, caretrc.top + dy );
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ShowCaret(hwndCaret);
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}
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if( bOwnRgn && hrgnUpdate ) DeleteObject( hrgnUpdate );
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return retVal;
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}
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/*************************************************************************
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* ScrollWindow (USER32.@)
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*
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*/
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BOOL WINAPI ScrollWindow( HWND hwnd, INT dx, INT dy,
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const RECT *rect, const RECT *clipRect )
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{
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return
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(ERROR != ScrollWindowEx( hwnd, dx, dy, rect, clipRect, 0, NULL,
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(rect ? 0 : SW_SCROLLCHILDREN) |
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SW_INVALIDATE ));
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}
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/*************************************************************************
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* ScrollDC (USER32.@)
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*
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* dx, dy, lprcScroll and lprcClip are all in logical coordinates (msdn is wrong)
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* hrgnUpdate is returned in device coordinates with rcUpdate in logical coordinates.
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*/
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BOOL WINAPI ScrollDC( HDC hdc, INT dx, INT dy, const RECT *lprcScroll,
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const RECT *lprcClip, HRGN hrgnUpdate, LPRECT lprcUpdate )
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{
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RECT rSrc, rClipped_src, rClip, rDst, offset;
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TRACE( "%p %d,%d hrgnUpdate=%p lprcUpdate = %p\n", hdc, dx, dy, hrgnUpdate, lprcUpdate );
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if (lprcClip) TRACE( "lprcClip = %s\n", wine_dbgstr_rect(lprcClip));
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if (lprcScroll) TRACE( "lprcScroll = %s\n", wine_dbgstr_rect(lprcScroll));
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if (USER_Driver.pScrollDC)
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return USER_Driver.pScrollDC( hdc, dx, dy, lprcScroll, lprcClip, hrgnUpdate, lprcUpdate );
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/* compute device clipping region (in device coordinates) */
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if (lprcScroll) rSrc = *lprcScroll;
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else GetClipBox( hdc, &rSrc );
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LPtoDP(hdc, (LPPOINT)&rSrc, 2);
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if (lprcClip) rClip = *lprcClip;
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else GetClipBox( hdc, &rClip );
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LPtoDP(hdc, (LPPOINT)&rClip, 2);
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IntersectRect( &rClipped_src, &rSrc, &rClip );
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TRACE("rSrc %s rClip %s clipped rSrc %s\n", wine_dbgstr_rect(&rSrc),
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wine_dbgstr_rect(&rClip), wine_dbgstr_rect(&rClipped_src));
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rDst = rClipped_src;
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SetRect(&offset, 0, 0, dx, dy);
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LPtoDP(hdc, (LPPOINT)&offset, 2);
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OffsetRect( &rDst, offset.right - offset.left, offset.bottom - offset.top );
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TRACE("rDst before clipping %s\n", wine_dbgstr_rect(&rDst));
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IntersectRect( &rDst, &rDst, &rClip );
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TRACE("rDst after clipping %s\n", wine_dbgstr_rect(&rDst));
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if (!IsRectEmpty(&rDst))
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{
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/* copy bits */
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RECT rDst_lp = rDst, rSrc_lp = rDst;
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OffsetRect( &rSrc_lp, offset.left - offset.right, offset.top - offset.bottom );
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DPtoLP(hdc, (LPPOINT)&rDst_lp, 2);
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DPtoLP(hdc, (LPPOINT)&rSrc_lp, 2);
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if (!BitBlt( hdc, rDst_lp.left, rDst_lp.top,
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rDst_lp.right - rDst_lp.left, rDst_lp.bottom - rDst_lp.top,
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hdc, rSrc_lp.left, rSrc_lp.top, SRCCOPY))
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return FALSE;
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}
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/* compute update areas. This is the clipped source or'ed with the unclipped source translated minus the
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clipped src translated (rDst) all clipped to rClip */
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if (hrgnUpdate || lprcUpdate)
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{
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HRGN hrgn = hrgnUpdate, hrgn2;
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if (hrgn) SetRectRgn( hrgn, rClipped_src.left, rClipped_src.top, rClipped_src.right, rClipped_src.bottom );
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else hrgn = CreateRectRgn( rClipped_src.left, rClipped_src.top, rClipped_src.right, rClipped_src.bottom );
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hrgn2 = CreateRectRgnIndirect( &rSrc );
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OffsetRgn(hrgn2, offset.right - offset.left, offset.bottom - offset.top );
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CombineRgn(hrgn, hrgn, hrgn2, RGN_OR);
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SetRectRgn( hrgn2, rDst.left, rDst.top, rDst.right, rDst.bottom );
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CombineRgn( hrgn, hrgn, hrgn2, RGN_DIFF );
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SetRectRgn( hrgn2, rClip.left, rClip.top, rClip.right, rClip.bottom );
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CombineRgn( hrgn, hrgn, hrgn2, RGN_AND );
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if( lprcUpdate )
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{
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GetRgnBox( hrgn, lprcUpdate );
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/* Put the lprcUpdate in logical coordinate */
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DPtoLP( hdc, (LPPOINT)lprcUpdate, 2 );
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TRACE("returning lprcUpdate %s\n", wine_dbgstr_rect(lprcUpdate));
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}
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if (!hrgnUpdate) DeleteObject( hrgn );
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DeleteObject( hrgn2 );
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}
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return TRUE;
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}
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