windows/scroll.c

   1 /*
   2  * Scroll windows and DCs
   3  *
   4  * Copyright  David W. Metcalfe, 1993
   5  *            Alex Korobka       1995,1996
   6  *
   7  *
   8  */
   9
  10 #include <stdlib.h>
  11 #include "windows.h"
  12 #include "class.h"
  13 #include "win.h"
  14 #include "gdi.h"
  15 #include "dce.h"
  16 #include "region.h"
  17 #include "graphics.h"
  18 #include "sysmetrics.h"
  19 #include "stddebug.h"
  20 #include "debug.h"
  21
  22 extern HWND32 CARET_GetHwnd();                  /* windows/caret.c */
  23 extern void   CARET_GetRect(LPRECT32);
  24 extern void CLIPPING_UpdateGCRegion(DC* );      /* objects/clipping.c */
  25
  26 /*************************************************************************
  27  *             ScrollWindow16   (USER.61)
  28  */
  29 void ScrollWindow16( HWND16 hwnd, INT16 dx, INT16 dy, const RECT16 *rect,
  30                      const RECT16 *clipRect )
  31 {
  32     RECT32 rect32, clipRect32;
  33
  34     if (rect) CONV_RECT16TO32( rect, &rect32 );
  35     if (clipRect) CONV_RECT16TO32( clipRect, &clipRect32 );
  36     ScrollWindow32( hwnd, dx, dy, rect ? &rect32 : NULL,
  37                     clipRect ? &clipRect32 : NULL );
  38 }
  39
  40 /*************************************************************************
  41  *             ScrollWindow32   (USER32.449)
  42  */
  43 BOOL32 ScrollWindow32( HWND32 hwnd, INT32 dx, INT32 dy, const RECT32 *rect,
  44                        const RECT32 *clipRect )
  45 {
  46     HDC32       hdc;
  47     HRGN32      hrgnUpdate,hrgnClip;
  48     RECT32      rc, cliprc;
  49     HWND32      hCaretWnd = CARET_GetHwnd();
  50     WND*        wndScroll = WIN_FindWndPtr( hwnd );
  51
  52     dprintf_scroll(stddeb,"ScrollWindow: hwnd=%04x, dx=%d, dy=%d, lpRect =%p clipRect=%i,%i,%i,%i\n",
  53                    hwnd, dx, dy, rect,
  54                    clipRect ? clipRect->left : 0,
  55                    clipRect ? clipRect->top : 0,
  56                    clipRect ? clipRect->right : 0,
  57                    clipRect ? clipRect->bottom : 0 );
  58
  59     if ( !wndScroll || !WIN_IsWindowDrawable( wndScroll, TRUE ) ) return TRUE;
  60
  61     if ( !rect ) /* do not clip children */
  62        {
  63           GetClientRect32(hwnd, &rc);
  64           hrgnClip = CreateRectRgnIndirect32( &rc );
  65
  66           if ((hCaretWnd == hwnd) || IsChild32(hwnd,hCaretWnd))
  67               HideCaret32(hCaretWnd);
  68           else hCaretWnd = 0;
  69
  70           hdc = GetDCEx32(hwnd, hrgnClip, DCX_CACHE | DCX_CLIPSIBLINGS);
  71           DeleteObject32( hrgnClip );
  72        }
  73     else        /* clip children */
  74        {
  75           CopyRect32(&rc, rect);
  76
  77           if (hCaretWnd == hwnd) HideCaret32(hCaretWnd);
  78           else hCaretWnd = 0;
  79
  80           hdc = GetDCEx32( hwnd, 0, DCX_CACHE | DCX_USESTYLE );
  81        }
  82
  83     if (clipRect == NULL)
  84         GetClientRect32(hwnd, &cliprc);
  85     else
  86         CopyRect32(&cliprc, clipRect);
  87
  88     hrgnUpdate = CreateRectRgn32( 0, 0, 0, 0 );
  89     ScrollDC32( hdc, dx, dy, &rc, &cliprc, hrgnUpdate, NULL );
  90     ReleaseDC32(hwnd, hdc);
  91
  92     if( !rect )         /* move child windows and update region */
  93     {
  94       WND*      wndPtr;
  95
  96       if( wndScroll->hrgnUpdate > 1 )
  97         OffsetRgn32( wndScroll->hrgnUpdate, dx, dy );
  98
  99       for (wndPtr = wndScroll->child; wndPtr; wndPtr = wndPtr->next)
 100         SetWindowPos32(wndPtr->hwndSelf, 0, wndPtr->rectWindow.left + dx,
 101                        wndPtr->rectWindow.top  + dy, 0,0, SWP_NOZORDER |
 102                        SWP_NOSIZE | SWP_NOACTIVATE | SWP_NOREDRAW |
 103                        SWP_DEFERERASE );
 104     }
 105
 106     PAINT_RedrawWindow( hwnd, NULL, hrgnUpdate, RDW_ALLCHILDREN |
 107                             RDW_INVALIDATE | RDW_ERASE | RDW_ERASENOW, RDW_C_USEHRGN );
 108
 109     DeleteObject32( hrgnUpdate );
 110     if( hCaretWnd )
 111     {
 112         POINT32 pt;
 113         GetCaretPos32(&pt);
 114         pt.x += dx; pt.y += dy;
 115         SetCaretPos32(pt.x, pt.y);
 116         ShowCaret32(hCaretWnd);
 117     }
 118     return TRUE;
 119 }
 120
 121
 122 /*************************************************************************
 123  *             ScrollDC16   (USER.221)
 124  */
 125 BOOL16 ScrollDC16( HDC16 hdc, INT16 dx, INT16 dy, const RECT16 *rect,
 126                    const RECT16 *cliprc, HRGN16 hrgnUpdate, LPRECT16 rcUpdate )
 127 {
 128     RECT32 rect32, clipRect32, rcUpdate32;
 129     BOOL16 ret;
 130
 131     if (rect) CONV_RECT16TO32( rect, &rect32 );
 132     if (cliprc) CONV_RECT16TO32( cliprc, &clipRect32 );
 133     ret = ScrollDC32( hdc, dx, dy, rect ? &rect32 : NULL,
 134                       cliprc ? &clipRect32 : NULL, hrgnUpdate, &rcUpdate32 );
 135     if (rcUpdate) CONV_RECT32TO16( &rcUpdate32, rcUpdate );
 136     return ret;
 137 }
 138
 139
 140 /*************************************************************************
 141  *             ScrollDC32   (USER32.448)
 142  *
 143  * Both 'rc' and 'rLClip' are in logical units but update info is
 144  * returned in device coordinates.
 145  */
 146 BOOL32 ScrollDC32( HDC32 hdc, INT32 dx, INT32 dy, const RECT32 *rc,
 147                    const RECT32 *prLClip, HRGN32 hrgnUpdate, LPRECT32 rcUpdate )
 148 {
 149     RECT32 rDClip, rLClip;
 150     HRGN32 hrgnClip = 0;
 151     HRGN32 hrgnScrollClip = 0;
 152     POINT32 src, dest;
 153     INT32  ldx, ldy;
 154     DC *dc = (DC *)GDI_GetObjPtr(hdc, DC_MAGIC);
 155
 156     dprintf_scroll(stddeb,"ScrollDC: %04x %d,%d hrgnUpdate=%04x rcUpdate = %p cliprc = (%d,%d-%d,%d), rc=(%d,%d-%d,%d)\n",
 157                    (HDC16)hdc, dx, dy, hrgnUpdate, rcUpdate,
 158                    prLClip ? prLClip->left : 0, prLClip ? prLClip->top : 0, prLClip ? prLClip->right : 0, prLClip ? prLClip->bottom : 0,
 159                    rc ? rc->left : 0, rc ? rc->top : 0, rc ? rc->right : 0, rc ? rc->bottom : 0 );
 160
 161     if ( !dc || !hdc ) return FALSE;
 162
 163 /*
 164     printf(stddeb,"\t[wndOrgX=%i, wndExtX=%i, vportOrgX=%i, vportExtX=%i]\n",
 165                   dc->wndOrgX, dc->wndExtX, dc->vportOrgX, dc->vportExtX );
 166     printf(stddeb,"\t[wndOrgY=%i, wndExtY=%i, vportOrgY=%i, vportExtY=%i]\n",
 167                   dc->wndOrgY, dc->wndExtY, dc->vportOrgY, dc->vportExtY );
 168 */
 169
 170     /* compute device clipping region */
 171
 172     if ( rc )
 173     {
 174         rLClip = *rc;
 175         rDClip.left = XLPTODP(dc, rc->left); rDClip.right = XLPTODP(dc, rc->right);
 176         rDClip.top = YLPTODP(dc, rc->top); rDClip.bottom = YLPTODP(dc, rc->bottom);
 177     }
 178     else /* maybe we should just return FALSE? */
 179     {
 180         GetClipBox32( hdc, &rDClip );
 181         rLClip.left = XDPTOLP(dc, rDClip.left); rLClip.right = XDPTOLP(dc, rDClip.right);
 182         rLClip.top = YDPTOLP(dc, rDClip.top); rLClip.bottom = YDPTOLP(dc, rDClip.bottom);
 183     }
 184
 185     if (prLClip)
 186     {
 187         RECT32 r;
 188
 189         r.left = XLPTODP(dc, prLClip->left); r.right = XLPTODP(dc, prLClip->right);
 190         r.top = YLPTODP(dc, prLClip->top); r.bottom = YLPTODP(dc, prLClip->bottom);
 191         IntersectRect32(&rLClip,&rLClip,prLClip);
 192         IntersectRect32(&rDClip,&rDClip,&r);
 193     }
 194
 195     if( rDClip.left >= rDClip.right || rDClip.top >= rDClip.bottom )
 196         return FALSE;
 197
 198     hrgnClip = GetClipRgn16(hdc);
 199     hrgnScrollClip = CreateRectRgnIndirect32(&rDClip);
 200
 201     if( hrgnClip )
 202       {
 203         /* change device clipping region directly */
 204
 205         CombineRgn32( hrgnScrollClip, hrgnClip, 0, RGN_COPY );
 206         SetRectRgn32( hrgnClip, rDClip.left, rDClip.top,
 207                       rDClip.right, rDClip.bottom );
 208
 209         CLIPPING_UpdateGCRegion( dc );
 210       }
 211     else
 212         SelectClipRgn32( hdc, hrgnScrollClip );
 213
 214     /* translate coordinates */
 215
 216     ldx = dx * dc->wndExtX / dc->vportExtX;
 217     ldy = dy * dc->wndExtY / dc->vportExtY;
 218
 219     if (dx > 0)
 220         dest.x = (src.x = rLClip.left) + ldx;
 221     else
 222         src.x = (dest.x = rLClip.left) - ldx;
 223
 224     if (dy > 0)
 225         dest.y = (src.y = rLClip.top) + ldy;
 226     else
 227         src.y = (dest.y = rLClip.top) - ldy;
 228
 229     /* copy bits */
 230
 231     if( rDClip.right - rDClip.left > dx &&
 232         rDClip.bottom - rDClip.top > dy )
 233     {
 234         ldx = rLClip.right - rLClip.left - ldx;
 235         ldy = rLClip.bottom - rLClip.top - ldy;
 236
 237         if (!BitBlt32( hdc, dest.x, dest.y, ldx, ldy,
 238                        hdc, src.x, src.y, SRCCOPY))
 239             return FALSE;
 240     }
 241
 242     /* restore clipping region */
 243
 244     if( hrgnClip )
 245     {
 246         CombineRgn32( hrgnClip, hrgnScrollClip, 0, RGN_COPY );
 247         CLIPPING_UpdateGCRegion( dc );
 248         SetRectRgn32( hrgnScrollClip, rDClip.left, rDClip.top,
 249                       rDClip.right, rDClip.bottom );
 250     }
 251     else
 252         SelectClipRgn32( hdc, 0 );
 253
 254     /* compute update areas */
 255
 256     if (hrgnUpdate || rcUpdate)
 257     {
 258         HRGN32 hrgn = (hrgnUpdate) ? hrgnUpdate : CreateRectRgn32( 0,0,0,0 );
 259
 260         if( dc->w.hVisRgn )
 261         {
 262           CombineRgn32( hrgn, dc->w.hVisRgn, hrgnScrollClip, RGN_AND );
 263           OffsetRgn32( hrgn, dx, dy );
 264           CombineRgn32( hrgn, dc->w.hVisRgn, hrgn, RGN_DIFF );
 265           CombineRgn32( hrgn, hrgn, hrgnScrollClip, RGN_AND );
 266         }
 267         else
 268         {
 269           RECT32 rect;
 270
 271           rect = rDClip;                                /* vertical band */
 272           if (dx > 0) rect.right = rect.left + dx;
 273           else if (dx < 0) rect.left = rect.right + dx;
 274           else SetRectEmpty32( &rect );
 275           SetRectRgn32( hrgn, rect.left, rect.top, rect.right, rect.bottom );
 276
 277           rect = rDClip;                                /* horizontal band */
 278           if (dy > 0) rect.bottom = rect.top + dy;
 279           else if (dy < 0) rect.top = rect.bottom + dy;
 280           else SetRectEmpty32( &rect );
 281
 282           REGION_UnionRectWithRgn( hrgn, &rect );
 283         }
 284
 285         if (rcUpdate) GetRgnBox32( hrgn, rcUpdate );
 286         if (!hrgnUpdate) DeleteObject32( hrgn );
 287     }
 288
 289     DeleteObject32( hrgnScrollClip );
 290     return TRUE;
 291 }
 292
 293
 294 /*************************************************************************
 295  *             ScrollWindowEx16   (USER.319)
 296  */
 297 INT16 ScrollWindowEx16( HWND16 hwnd, INT16 dx, INT16 dy, const RECT16 *rect,
 298                         const RECT16 *clipRect, HRGN16 hrgnUpdate,
 299                         LPRECT16 rcUpdate, UINT16 flags )
 300 {
 301     RECT32 rect32, clipRect32, rcUpdate32;
 302     BOOL16 ret;
 303
 304     if (rect) CONV_RECT16TO32( rect, &rect32 );
 305     if (clipRect) CONV_RECT16TO32( clipRect, &clipRect32 );
 306     ret = ScrollWindowEx32( hwnd, dx, dy, rect ? &rect32 : NULL,
 307                             clipRect ? &clipRect32 : NULL, hrgnUpdate,
 308                             (rcUpdate) ? &rcUpdate32 : NULL, flags );
 309     if (rcUpdate) CONV_RECT32TO16( &rcUpdate32, rcUpdate );
 310     return ret;
 311 }
 312
 313 /*************************************************************************
 314  *             SCROLL_FixCaret
 315  */
 316 BOOL32 SCROLL_FixCaret(HWND32 hWnd, LPRECT32 lprc, UINT32 flags)
 317 {
 318    HWND32 hCaret = CARET_GetHwnd();
 319
 320    if( hCaret )
 321    {
 322        RECT32   rc;
 323        CARET_GetRect( &rc );
 324        if( hCaret == hWnd ||
 325           (flags & SW_SCROLLCHILDREN && IsChild32(hWnd, hCaret)) )
 326        {
 327            POINT32     pt;
 328
 329            pt.x = rc.left; pt.y = rc.top;
 330            MapWindowPoints32( hCaret, hWnd, (LPPOINT32)&rc, 2 );
 331            if( IntersectRect32(lprc, lprc, &rc) )
 332            {
 333                HideCaret32(0);
 334                lprc->left = pt.x; lprc->top = pt.y;
 335                return TRUE;
 336            }
 337        }
 338    }
 339    return FALSE;
 340 }
 341
 342 /*************************************************************************
 343  *             ScrollWindowEx32   (USER32.450)
 344  */
 345 INT32 ScrollWindowEx32( HWND32 hwnd, INT32 dx, INT32 dy, const RECT32 *rect,
 346                         const RECT32 *clipRect, HRGN32 hrgnUpdate,
 347                         LPRECT32 rcUpdate, UINT32 flags )
 348 {
 349     INT32  retVal = NULLREGION;
 350     BOOL32 bCaret = FALSE, bOwnRgn = TRUE;
 351     RECT32 rc, cliprc;
 352     WND*   wnd = WIN_FindWndPtr( hwnd );
 353
 354     if( !wnd || !WIN_IsWindowDrawable( wnd, TRUE )) return ERROR;
 355
 356     if (rect == NULL) GetClientRect32(hwnd, &rc);
 357     else rc = *rect;
 358
 359     if (clipRect) IntersectRect32(&cliprc,&rc,clipRect);
 360     else cliprc = rc;
 361
 362     if (!IsRectEmpty32(&cliprc) && (dx || dy))
 363     {
 364         DC*     dc;
 365         HDC32   hDC;
 366         BOOL32  bUpdate = (rcUpdate || hrgnUpdate || flags & (SW_INVALIDATE | SW_ERASE));
 367         HRGN32  hrgnClip = CreateRectRgnIndirect32(&cliprc);
 368
 369 dprintf_scroll(stddeb,"ScrollWindowEx: %04x, %d,%d hrgnUpdate=%04x rcUpdate = %p \
 370 cliprc = (%d,%d-%d,%d), rc=(%d,%d-%d,%d) %04x\n",
 371 (HWND16)hwnd, dx, dy, hrgnUpdate, rcUpdate,
 372 clipRect?clipRect->left:0, clipRect?clipRect->top:0, clipRect?clipRect->right:0, clipRect?clipRect->bottom:0,
 373 rect?rect->left:0, rect?rect->top:0, rect ?rect->right:0, rect ?rect->bottom:0, (UINT16)flags );
 374
 375         rc = cliprc;
 376         bCaret = SCROLL_FixCaret(hwnd, &rc, flags);
 377
 378         if( hrgnUpdate ) bOwnRgn = FALSE;
 379         else if( bUpdate ) hrgnUpdate = CreateRectRgn32( 0, 0, 0, 0 );
 380
 381         hDC = GetDCEx32( hwnd, hrgnClip, DCX_CACHE | DCX_USESTYLE |
 382                         (flags & SW_SCROLLCHILDREN) ? DCX_NOCLIPCHILDREN : 0 );
 383         if( (dc = (DC *)GDI_GetObjPtr(hDC, DC_MAGIC)) )
 384         {
 385             POINT32 dst, src;
 386
 387             if( dx > 0 ) dst.x = (src.x = dc->w.DCOrgX + cliprc.left) + dx;
 388             else src.x = (dst.x = dc->w.DCOrgX + cliprc.left) - dx;
 389
 390             if( dy > 0 ) dst.y = (src.y = dc->w.DCOrgY + cliprc.top) + dy;
 391             else src.y = (dst.y = dc->w.DCOrgY + cliprc.top) - dy;
 392
 393             if( bUpdate )
 394                 XSetGraphicsExposures( display, dc->u.x.gc, True );
 395             XSetFunction( display, dc->u.x.gc, GXcopy );
 396             XCopyArea( display, dc->u.x.drawable, dc->u.x.drawable, dc->u.x.gc,
 397                        src.x, src.y, cliprc.right - cliprc.left - abs(dx),
 398                        cliprc.bottom - cliprc.top - abs(dy), dst.x, dst.y );
 399             if( bUpdate )
 400                 XSetGraphicsExposures( display, dc->u.x.gc, False );
 401
 402             if( dc->w.hVisRgn && bUpdate )
 403             {
 404                 CombineRgn32( hrgnUpdate, dc->w.hVisRgn, hrgnClip, RGN_AND );
 405                 OffsetRgn32( hrgnUpdate, dx, dy );
 406                 CombineRgn32( hrgnUpdate, dc->w.hVisRgn, hrgnUpdate, RGN_DIFF );
 407                 CombineRgn32( hrgnUpdate, hrgnUpdate, hrgnClip, RGN_AND );
 408
 409                 if( rcUpdate ) GetRgnBox32( hrgnUpdate, rcUpdate );
 410             }
 411             ReleaseDC32(hwnd, hDC);
 412         }
 413
 414         if( wnd->hrgnUpdate > 1 )
 415         {
 416             if( rect || clipRect )
 417             {
 418                 if( (CombineRgn32( hrgnClip, hrgnClip,
 419                                    wnd->hrgnUpdate, RGN_AND ) != NULLREGION) )
 420                 {
 421                     CombineRgn32( wnd->hrgnUpdate, wnd->hrgnUpdate, hrgnClip, RGN_DIFF );
 422                     OffsetRgn32( hrgnClip, dx, dy );
 423                     CombineRgn32( wnd->hrgnUpdate, wnd->hrgnUpdate, hrgnClip, RGN_OR );
 424                 }
 425             }
 426             else
 427                 OffsetRgn32( wnd->hrgnUpdate, dx, dy );
 428         }
 429
 430         if( flags & SW_SCROLLCHILDREN )
 431         {
 432             RECT32      r;
 433             WND*        w;
 434             for( w = wnd->child; w; w = w->next )
 435             {
 436                  CONV_RECT16TO32( &w->rectWindow, &r );
 437                  if( IntersectRect32(&r, &r, &cliprc) )
 438                      SetWindowPos32(w->hwndSelf, 0, w->rectWindow.left + dx,
 439                                     w->rectWindow.top  + dy, 0,0, SWP_NOZORDER |
 440                                     SWP_NOSIZE | SWP_NOACTIVATE | SWP_NOREDRAW |
 441                                     SWP_DEFERERASE );
 442             }
 443         }
 444
 445         if( flags & (SW_INVALIDATE | SW_ERASE) )
 446             PAINT_RedrawWindow( hwnd, NULL, hrgnUpdate, RDW_INVALIDATE | RDW_ERASE |
 447                                         ((flags & SW_ERASE) ? RDW_ERASENOW : 0), 0 );
 448
 449         if( bCaret )
 450         {
 451             SetCaretPos32( rc.left + dx, rc.top + dy );
 452             ShowCaret32(0);
 453         }
 454
 455         if( bOwnRgn && hrgnUpdate ) DeleteObject32( hrgnUpdate );
 456         DeleteObject32( hrgnClip );
 457     }
 458     return retVal;
 459 }
 460