dlls/riched20/caret.c

   1 /*
   2  * RichEdit - Caret and selection functions.
   3  *
   4  * Copyright 2004 by Krzysztof Foltman
   5  * Copyright 2005 by Phil Krylov
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  */
  21
  22
  23 #include "editor.h"
  24
  25 WINE_DEFAULT_DEBUG_CHANNEL(richedit);
  26
  27 static BOOL
  28 ME_MoveCursorChars(ME_TextEditor *editor, ME_Cursor *pCursor, int nRelOfs);
  29
  30 void ME_GetSelection(ME_TextEditor *editor, int *from, int *to)
  31 {
  32   *from = ME_GetCursorOfs(editor, 0);
  33   *to =   ME_GetCursorOfs(editor, 1);
  34
  35   if (*from > *to)
  36   {
  37     int tmp = *from;
  38     *from = *to;
  39     *to = tmp;
  40   }
  41 }
  42
  43 int ME_GetTextLength(ME_TextEditor *editor)
  44 {
  45   return ME_CharOfsFromRunOfs(editor, ME_FindItemBack(editor->pBuffer->pLast, diRun), 0);
  46 }
  47
  48
  49 int ME_GetTextLengthEx(ME_TextEditor *editor, const GETTEXTLENGTHEX *how)
  50 {
  51   int length;
  52
  53   if (how->flags & GTL_PRECISE && how->flags & GTL_CLOSE)
  54     return E_INVALIDARG;
  55   if (how->flags & GTL_NUMCHARS && how->flags & GTL_NUMBYTES)
  56     return E_INVALIDARG;
  57
  58   length = ME_GetTextLength(editor);
  59
  60   if ((GetWindowLongW(editor->hWnd, GWL_STYLE) & ES_MULTILINE)
  61         && (how->flags & GTL_USECRLF)
  62         && !editor->bEmulateVersion10) /* Ignore GTL_USECRLF flag in 1.0 emulation */
  63     length += editor->nParagraphs - 1;
  64
  65   if (how->flags & GTL_NUMBYTES)
  66   {
  67     CPINFO cpinfo;
  68
  69     if (how->codepage == 1200)
  70       return length * 2;
  71     if (how->flags & GTL_PRECISE)
  72       FIXME("GTL_PRECISE flag unsupported. Using GTL_CLOSE\n");
  73     if (GetCPInfo(how->codepage, &cpinfo))
  74       return length * cpinfo.MaxCharSize;
  75     ERR("Invalid codepage %u\n", how->codepage);
  76     return E_INVALIDARG;
  77   }
  78   return length;
  79 }
  80
  81
  82 int ME_SetSelection(ME_TextEditor *editor, int from, int to)
  83 {
  84   int selectionEnd = 0;
  85   const int len = ME_GetTextLength(editor);
  86
  87   /* all negative values are effectively the same */
  88   if (from < 0)
  89     from = -1;
  90   if (to < 0)
  91     to = -1;
  92
  93   /* select all */
  94   if (from == 0 && to == -1)
  95   {
  96     editor->pCursors[1].pRun = ME_FindItemFwd(editor->pBuffer->pFirst, diRun);
  97     editor->pCursors[1].nOffset = 0;
  98     editor->pCursors[0].pRun = ME_FindItemBack(editor->pBuffer->pLast, diRun);
  99     editor->pCursors[0].nOffset = 0;
 100     ME_InvalidateSelection(editor);
 101     ME_ClearTempStyle(editor);
 102     return len + 1;
 103   }
 104
 105   /* if both values are equal and also out of bound, that means to */
 106   /* put the selection at the end of the text */
 107   if ((from == to) && (to < 0 || to > len))
 108   {
 109     selectionEnd = 1;
 110   }
 111   else
 112   {
 113     /* if from is negative and to is positive then selection is */
 114     /* deselected and caret moved to end of the current selection */
 115     if (from < 0)
 116     {
 117       int start, end;
 118       ME_GetSelection(editor, &start, &end);
 119       editor->pCursors[1] = editor->pCursors[0];
 120       ME_Repaint(editor);
 121       ME_ClearTempStyle(editor);
 122       return end;
 123     }
 124
 125     /* adjust to if it's a negative value */
 126     if (to < 0)
 127       to = len + 1;
 128
 129     /* flip from and to if they are reversed */
 130     if (from>to)
 131     {
 132       int tmp = from;
 133       from = to;
 134       to = tmp;
 135     }
 136
 137     /* after fiddling with the values, we find from > len && to > len */
 138     if (from > len)
 139       selectionEnd = 1;
 140     /* special case with to too big */
 141     else if (to > len)
 142       to = len + 1;
 143   }
 144
 145   if (selectionEnd)
 146   {
 147     editor->pCursors[1].pRun = editor->pCursors[0].pRun = ME_FindItemBack(editor->pBuffer->pLast, diRun);
 148     editor->pCursors[1].nOffset = editor->pCursors[0].nOffset = 0;
 149     ME_InvalidateSelection(editor);
 150     ME_ClearTempStyle(editor);
 151     return len;
 152   }
 153
 154   ME_RunOfsFromCharOfs(editor, from, &editor->pCursors[1].pRun, &editor->pCursors[1].nOffset);
 155   ME_RunOfsFromCharOfs(editor, to, &editor->pCursors[0].pRun, &editor->pCursors[0].nOffset);
 156   return to;
 157 }
 158
 159
 160 void
 161 ME_GetCursorCoordinates(ME_TextEditor *editor, ME_Cursor *pCursor,
 162                         int *x, int *y, int *height)
 163 {
 164   ME_DisplayItem *pCursorRun = pCursor->pRun;
 165   ME_DisplayItem *pSizeRun = pCursor->pRun;
 166
 167   assert(height && x && y);
 168   assert(!(ME_GetParagraph(pCursorRun)->member.para.nFlags & MEPF_REWRAP));
 169   assert(pCursor->pRun);
 170   assert(pCursor->pRun->type == diRun);
 171
 172   if (pCursorRun->type == diRun) {
 173     ME_DisplayItem *row = ME_FindItemBack(pCursorRun, diStartRowOrParagraph);
 174
 175     if (row) {
 176       HDC hDC = GetDC(editor->hWnd);
 177       ME_Context c;
 178       ME_DisplayItem *run = pCursorRun;
 179       ME_DisplayItem *para = NULL;
 180       SIZE sz = {0, 0};
 181
 182       ME_InitContext(&c, editor, hDC);
 183
 184       if (!pCursor->nOffset)
 185       {
 186         ME_DisplayItem *prev = ME_FindItemBack(pCursorRun, diRunOrParagraph);
 187         assert(prev);
 188         if (prev->type == diRun)
 189           pSizeRun = prev;
 190       }
 191       assert(row->type == diStartRow); /* paragraph -> run without start row ?*/
 192       para = ME_FindItemBack(row, diParagraph);
 193       assert(para);
 194       assert(para->type == diParagraph);
 195       if (editor->bCaretAtEnd && !pCursor->nOffset &&
 196           run == ME_FindItemFwd(row, diRun))
 197       {
 198         ME_DisplayItem *tmp = ME_FindItemBack(row, diRunOrParagraph);
 199         assert(tmp);
 200         if (tmp->type == diRun)
 201         {
 202           row = ME_FindItemBack(tmp, diStartRow);
 203           pSizeRun = run = tmp;
 204           assert(run);
 205           assert(run->type == diRun);
 206           sz = ME_GetRunSize(&c, &para->member.para,
 207                              &run->member.run, ME_StrLen(run->member.run.strText),
 208                              row->member.row.nLMargin);
 209         }
 210       }
 211       if (pCursor->nOffset) {
 212         sz = ME_GetRunSize(&c, &para->member.para, &run->member.run, pCursor->nOffset,
 213                            row->member.row.nLMargin);
 214       }
 215
 216       *height = pSizeRun->member.run.nAscent + pSizeRun->member.run.nDescent;
 217       *x = run->member.run.pt.x + sz.cx;
 218       *y = para->member.para.nYPos + row->member.row.nBaseline + run->member.run.pt.y - pSizeRun->member.run.nAscent - ME_GetYScrollPos(editor);
 219       ME_DestroyContext(&c, editor->hWnd);
 220       return;
 221     }
 222   }
 223   *height = 10; /* FIXME use global font */
 224   *x = 0;
 225   *y = 0;
 226 }
 227
 228
 229 void
 230 ME_MoveCaret(ME_TextEditor *editor)
 231 {
 232   int x, y, height;
 233
 234   if (ME_WrapMarkedParagraphs(editor))
 235     ME_UpdateScrollBar(editor);
 236   ME_GetCursorCoordinates(editor, &editor->pCursors[0], &x, &y, &height);
 237   if(editor->bHaveFocus && !ME_IsSelection(editor))
 238   {
 239     RECT rect;
 240
 241     GetClientRect(editor->hWnd, &rect);
 242     x = min(x, rect.right-2);
 243     CreateCaret(editor->hWnd, NULL, 0, height);
 244     SetCaretPos(x, y);
 245   } else {
 246     DestroyCaret();
 247   }
 248 }
 249
 250
 251 void ME_ShowCaret(ME_TextEditor *ed)
 252 {
 253   ME_MoveCaret(ed);
 254   if(ed->bHaveFocus && !ME_IsSelection(ed))
 255     ShowCaret(ed->hWnd);
 256 }
 257
 258 void ME_HideCaret(ME_TextEditor *ed)
 259 {
 260   if(!ed->bHaveFocus || ME_IsSelection(ed))
 261   {
 262     HideCaret(ed->hWnd);
 263     DestroyCaret();
 264   }
 265 }
 266
 267 void ME_InternalDeleteText(ME_TextEditor *editor, int nOfs,
 268   int nChars)
 269 {
 270   ME_Cursor c;
 271   int shift = 0;
 272
 273   while(nChars > 0)
 274   {
 275     ME_Run *run;
 276     ME_CursorFromCharOfs(editor, nOfs, &c);
 277     run = &c.pRun->member.run;
 278     if (run->nFlags & MERF_ENDPARA) {
 279       int eollen = run->nCR + run->nLF;
 280
 281       if (!ME_FindItemFwd(c.pRun, diParagraph))
 282       {
 283         return;
 284       }
 285       ME_JoinParagraphs(editor, ME_GetParagraph(c.pRun));
 286       /* ME_SkipAndPropagateCharOffset(p->pRun, shift); */
 287       ME_CheckCharOffsets(editor);
 288       nChars -= (eollen < nChars) ? eollen : nChars;
 289       continue;
 290     }
 291     else
 292     {
 293       ME_Cursor cursor;
 294       int nIntendedChars = nChars;
 295       int nCharsToDelete = nChars;
 296       int i;
 297       int loc = c.nOffset;
 298
 299       ME_FindItemBack(c.pRun, diParagraph)->member.para.nFlags |= MEPF_REWRAP;
 300
 301       cursor = c;
 302       ME_StrRelPos(run->strText, loc, &nChars);
 303       /* nChars is the number of characters that should be deleted from the
 304          FOLLOWING runs (these AFTER cursor.pRun)
 305          nCharsToDelete is a number of chars to delete from THIS run */
 306       nCharsToDelete -= nChars;
 307       shift -= nCharsToDelete;
 308       TRACE("Deleting %d (intended %d-remaning %d) chars at %d in '%s' (%d)\n",
 309         nCharsToDelete, nIntendedChars, nChars, c.nOffset,
 310         debugstr_w(run->strText->szData), run->strText->nLen);
 311
 312       if (!c.nOffset && ME_StrVLen(run->strText) == nCharsToDelete)
 313       {
 314         /* undo = reinsert whole run */
 315         /* nOfs is a character offset (from the start of the document
 316            to the current (deleted) run */
 317         ME_UndoItem *pUndo = ME_AddUndoItem(editor, diUndoInsertRun, c.pRun);
 318         if (pUndo)
 319           pUndo->di.member.run.nCharOfs = nOfs;
 320       }
 321       else
 322       {
 323         /* undo = reinsert partial run */
 324         ME_UndoItem *pUndo = ME_AddUndoItem(editor, diUndoInsertRun, c.pRun);
 325         if (pUndo) {
 326           ME_DestroyString(pUndo->di.member.run.strText);
 327           pUndo->di.member.run.nCharOfs = nOfs;
 328           pUndo->di.member.run.strText = ME_MakeStringN(run->strText->szData+c.nOffset, nCharsToDelete);
 329         }
 330       }
 331       TRACE("Post deletion string: %s (%d)\n", debugstr_w(run->strText->szData), run->strText->nLen);
 332       TRACE("Shift value: %d\n", shift);
 333       ME_StrDeleteV(run->strText, c.nOffset, nCharsToDelete);
 334
 335       /* update cursors (including c) */
 336       for (i=-1; i<editor->nCursors; i++) {
 337         ME_Cursor *pThisCur = editor->pCursors + i;
 338         if (i == -1) pThisCur = &c;
 339         if (pThisCur->pRun == cursor.pRun) {
 340           if (pThisCur->nOffset > cursor.nOffset) {
 341             if (pThisCur->nOffset-cursor.nOffset < nCharsToDelete)
 342               pThisCur->nOffset = cursor.nOffset;
 343             else
 344               pThisCur->nOffset -= nCharsToDelete;
 345             assert(pThisCur->nOffset >= 0);
 346             assert(pThisCur->nOffset <= ME_StrVLen(run->strText));
 347           }
 348           if (pThisCur->nOffset == ME_StrVLen(run->strText))
 349           {
 350             pThisCur->pRun = ME_FindItemFwd(pThisCur->pRun, diRunOrParagraphOrEnd);
 351             assert(pThisCur->pRun->type == diRun);
 352             pThisCur->nOffset = 0;
 353           }
 354         }
 355       }
 356
 357       /* c = updated data now */
 358
 359       if (c.pRun == cursor.pRun)
 360         ME_SkipAndPropagateCharOffset(c.pRun, shift);
 361       else
 362         ME_PropagateCharOffset(c.pRun, shift);
 363
 364       if (!ME_StrVLen(cursor.pRun->member.run.strText))
 365       {
 366         TRACE("Removing useless run\n");
 367         ME_Remove(cursor.pRun);
 368         ME_DestroyDisplayItem(cursor.pRun);
 369       }
 370
 371       shift = 0;
 372       /*
 373       ME_CheckCharOffsets(editor);
 374       */
 375       continue;
 376     }
 377   }
 378 }
 379
 380 void ME_DeleteTextAtCursor(ME_TextEditor *editor, int nCursor,
 381   int nChars)
 382 {
 383   assert(nCursor>=0 && nCursor<editor->nCursors);
 384   /* text operations set modified state */
 385   editor->nModifyStep = 1;
 386   ME_InternalDeleteText(editor, ME_GetCursorOfs(editor, nCursor), nChars);
 387 }
 388
 389 static ME_DisplayItem *
 390 ME_InternalInsertTextFromCursor(ME_TextEditor *editor, int nCursor,
 391                                 const WCHAR *str, int len, ME_Style *style,
 392                                 int flags)
 393 {
 394   ME_Cursor *p = &editor->pCursors[nCursor];
 395
 396   editor->bCaretAtEnd = FALSE;
 397
 398   assert(p->pRun->type == diRun);
 399
 400   return ME_InsertRunAtCursor(editor, p, style, str, len, flags);
 401 }
 402
 403
 404 void ME_InsertOLEFromCursor(ME_TextEditor *editor, const REOBJECT* reo, int nCursor)
 405 {
 406   ME_Style              *pStyle = ME_GetInsertStyle(editor, nCursor);
 407   ME_DisplayItem        *di;
 408   WCHAR                 space = ' ';
 409
 410   /* FIXME no no no */
 411   if (ME_IsSelection(editor))
 412     ME_DeleteSelection(editor);
 413
 414   di = ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, pStyle,
 415                                        MERF_GRAPHICS);
 416   di->member.run.ole_obj = ALLOC_OBJ(*reo);
 417   ME_CopyReObject(di->member.run.ole_obj, reo);
 418   ME_SendSelChange(editor);
 419 }
 420
 421
 422 void ME_InsertEndRowFromCursor(ME_TextEditor *editor, int nCursor)
 423 {
 424   ME_Style              *pStyle = ME_GetInsertStyle(editor, nCursor);
 425   ME_DisplayItem        *di;
 426   WCHAR                 space = ' ';
 427
 428   /* FIXME no no no */
 429   if (ME_IsSelection(editor))
 430     ME_DeleteSelection(editor);
 431
 432   di = ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, pStyle,
 433                                        MERF_ENDROW);
 434   ME_SendSelChange(editor);
 435 }
 436
 437 void
 438 ME_InsertTableCellFromCursor(ME_TextEditor *editor, int nCursor)
 439 {
 440   WCHAR tab = '\t';
 441   ME_DisplayItem *p, *run;
 442   ME_Style *pStyle = ME_GetInsertStyle(editor, nCursor);
 443
 444   p = ME_InternalInsertTextFromCursor(editor, nCursor, &tab, 1, pStyle,
 445                                       MERF_CELL);
 446   run = p;
 447   while ((run = ME_FindItemBack(run, diRunOrParagraph))->type == diRun)
 448   {
 449     if (run->member.run.nFlags & MERF_CELL)
 450     {
 451       assert(run->member.run.pCell->next);
 452       p->member.run.pCell = run->member.run.pCell->next;
 453       return;
 454     }
 455   }
 456   assert(run->type == diParagraph);
 457   assert(run->member.para.pFmt);
 458   assert(run->member.para.pFmt->dwMask & PFM_TABLE);
 459   assert(run->member.para.pFmt->wEffects & PFE_TABLE);
 460   assert(run->member.para.pCells);
 461   p->member.run.pCell = run->member.para.pCells;
 462 }
 463
 464
 465 void ME_InsertTextFromCursor(ME_TextEditor *editor, int nCursor,
 466   const WCHAR *str, int len, ME_Style *style)
 467 {
 468   const WCHAR *pos;
 469   ME_Cursor *p = NULL;
 470   int oldLen;
 471
 472   /* FIXME really HERE ? */
 473   if (ME_IsSelection(editor))
 474     ME_DeleteSelection(editor);
 475
 476   /* FIXME: is this too slow? */
 477   /* Didn't affect performance for WM_SETTEXT (around 50sec/30K) */
 478   oldLen = ME_GetTextLength(editor);
 479
 480   /* text operations set modified state */
 481   editor->nModifyStep = 1;
 482
 483   assert(style);
 484
 485   assert(nCursor>=0 && nCursor<editor->nCursors);
 486   if (len == -1)
 487     len = lstrlenW(str);
 488
 489   /* grow the text limit to fit our text */
 490   if(editor->nTextLimit < oldLen +len)
 491     editor->nTextLimit = oldLen + len;
 492
 493   while (len)
 494   {
 495     pos = str;
 496     /* FIXME this sucks - no respect for unicode (what else can be a line separator in unicode?) */
 497     while(pos-str < len && *pos != '\r' && *pos != '\n' && *pos != '\t')
 498       pos++;
 499     if (pos-str < len && *pos == '\t') { /* handle tabs */
 500       WCHAR tab = '\t';
 501
 502       if (pos!=str)
 503         ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
 504
 505       ME_InternalInsertTextFromCursor(editor, nCursor, &tab, 1, style, MERF_TAB);
 506
 507       pos++;
 508       if(pos-str <= len) {
 509         len -= pos - str;
 510         str = pos;
 511         continue;
 512       }
 513     }
 514     /* handle special \r\r\n sequence (richedit 2.x and higher only) */
 515     if (!editor->bEmulateVersion10 && pos-str < len-2 && pos[0] == '\r' && pos[1] == '\r' && pos[2] == '\n') {
 516       WCHAR space = ' ';
 517
 518       if (pos!=str)
 519         ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
 520
 521       ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, style, 0);
 522
 523       pos+=3;
 524       if(pos-str <= len) {
 525         len -= pos - str;
 526         str = pos;
 527         continue;
 528       }
 529     }
 530     if (pos-str < len) {   /* handle EOLs */
 531       ME_DisplayItem *tp, *end_run;
 532       ME_Style *tmp_style;
 533       int numCR, numLF;
 534
 535       if (pos!=str)
 536         ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
 537       p = &editor->pCursors[nCursor];
 538       if (p->nOffset) {
 539         ME_SplitRunSimple(editor, p->pRun, p->nOffset);
 540         p = &editor->pCursors[nCursor];
 541       }
 542       tmp_style = ME_GetInsertStyle(editor, nCursor);
 543       /* ME_SplitParagraph increases style refcount */
 544
 545       /* Encode and fill number of CR and LF according to emulation mode */
 546       if (editor->bEmulateVersion10) {
 547         const WCHAR * tpos;
 548
 549         /* We have to find out how many consecutive \r are there, and if there
 550            is a \n terminating the run of \r's. */
 551         numCR = 0; numLF = 0;
 552         tpos = pos;
 553         while (tpos-str < len && *tpos == '\r') {
 554           tpos++;
 555           numCR++;
 556         }
 557         if (tpos-str >= len) {
 558           /* Reached end of text without finding anything but '\r' */
 559           if (tpos != pos) {
 560             pos++;
 561           }
 562           numCR = 1; numLF = 0;
 563         } else if (*tpos == '\n') {
 564           /* The entire run of \r's plus the one \n is one single line break */
 565           pos = tpos + 1;
 566           numLF = 1;
 567         } else {
 568           /* Found some other content past the run of \r's */
 569           pos++;
 570           numCR = 1; numLF = 0;
 571         }
 572       } else {
 573         if(pos-str < len && *pos =='\r')
 574           pos++;
 575         if(pos-str < len && *pos =='\n')
 576           pos++;
 577         numCR = 1; numLF = 0;
 578       }
 579       tp = ME_SplitParagraph(editor, p->pRun, p->pRun->member.run.style, numCR, numLF);
 580       p->pRun = ME_FindItemFwd(tp, diRun);
 581       end_run = ME_FindItemBack(tp, diRun);
 582       ME_ReleaseStyle(end_run->member.run.style);
 583       end_run->member.run.style = tmp_style;
 584       p->nOffset = 0;
 585
 586       if(pos-str <= len) {
 587         len -= pos - str;
 588         str = pos;
 589         continue;
 590       }
 591     }
 592     ME_InternalInsertTextFromCursor(editor, nCursor, str, len, style, 0);
 593     len = 0;
 594   }
 595 }
 596
 597
 598 static BOOL
 599 ME_MoveCursorChars(ME_TextEditor *editor, ME_Cursor *pCursor, int nRelOfs)
 600 {
 601   ME_DisplayItem *pRun = pCursor->pRun;
 602
 603   if (nRelOfs == -1)
 604   {
 605     if (!pCursor->nOffset)
 606     {
 607       do {
 608         pRun = ME_FindItemBack(pRun, diRunOrParagraph);
 609         assert(pRun);
 610         switch (pRun->type)
 611         {
 612           case diRun:
 613             break;
 614           case diParagraph:
 615             if (pRun->member.para.prev_para->type == diTextStart)
 616               return FALSE;
 617             pRun = ME_FindItemBack(pRun, diRunOrParagraph);
 618             /* every paragraph ought to have at least one run */
 619             assert(pRun && pRun->type == diRun);
 620             assert(pRun->member.run.nFlags & MERF_ENDPARA);
 621             break;
 622           default:
 623             assert(pRun->type != diRun && pRun->type != diParagraph);
 624             return FALSE;
 625         }
 626       } while (RUN_IS_HIDDEN(&pRun->member.run));
 627       pCursor->pRun = pRun;
 628       if (pRun->member.run.nFlags & MERF_ENDPARA)
 629         pCursor->nOffset = 0;
 630       else
 631         pCursor->nOffset = pRun->member.run.strText->nLen;
 632     }
 633
 634     if (pCursor->nOffset)
 635       pCursor->nOffset = ME_StrRelPos2(pCursor->pRun->member.run.strText, pCursor->nOffset, nRelOfs);
 636     return TRUE;
 637   }
 638   else
 639   {
 640     if (!(pRun->member.run.nFlags & MERF_ENDPARA))
 641     {
 642       int new_ofs = ME_StrRelPos2(pRun->member.run.strText, pCursor->nOffset, nRelOfs);
 643
 644       if (new_ofs < pRun->member.run.strText->nLen)
 645       {
 646         pCursor->nOffset = new_ofs;
 647         return TRUE;
 648       }
 649     }
 650     do {
 651       pRun = ME_FindItemFwd(pRun, diRun);
 652     } while (pRun && RUN_IS_HIDDEN(&pRun->member.run));
 653     if (pRun)
 654     {
 655       pCursor->pRun = pRun;
 656       pCursor->nOffset = 0;
 657       return TRUE;
 658     }
 659   }
 660   return FALSE;
 661 }
 662
 663
 664 static BOOL
 665 ME_MoveCursorWords(ME_TextEditor *editor, ME_Cursor *cursor, int nRelOfs)
 666 {
 667   ME_DisplayItem *pRun = cursor->pRun, *pOtherRun;
 668   int nOffset = cursor->nOffset;
 669
 670   if (nRelOfs == -1)
 671   {
 672     /* Backward movement */
 673     while (TRUE)
 674     {
 675       nOffset = ME_CallWordBreakProc(editor, pRun->member.run.strText,
 676                                      nOffset, WB_MOVEWORDLEFT);
 677        if (nOffset)
 678         break;
 679       pOtherRun = ME_FindItemBack(pRun, diRunOrParagraph);
 680       if (pOtherRun->type == diRun)
 681       {
 682         if (ME_CallWordBreakProc(editor, pOtherRun->member.run.strText,
 683                                  pOtherRun->member.run.strText->nLen - 1,
 684                                  WB_ISDELIMITER)
 685             && !(pRun->member.run.nFlags & MERF_ENDPARA)
 686             && !(cursor->pRun == pRun && cursor->nOffset == 0)
 687             && !ME_CallWordBreakProc(editor, pRun->member.run.strText, 0,
 688                                      WB_ISDELIMITER))
 689           break;
 690         pRun = pOtherRun;
 691         nOffset = pOtherRun->member.run.strText->nLen;
 692       }
 693       else if (pOtherRun->type == diParagraph)
 694       {
 695         if (cursor->pRun == pRun && cursor->nOffset == 0)
 696         {
 697           /* Paragraph breaks are treated as separate words */
 698           if (pOtherRun->member.para.prev_para->type == diTextStart)
 699             return FALSE;
 700           pRun = ME_FindItemBack(pOtherRun, diRunOrParagraph);
 701         }
 702         break;
 703       }
 704     }
 705   }
 706   else
 707   {
 708     /* Forward movement */
 709     BOOL last_delim = FALSE;
 710
 711     while (TRUE)
 712     {
 713       if (last_delim && !ME_CallWordBreakProc(editor, pRun->member.run.strText,
 714                                               nOffset, WB_ISDELIMITER))
 715         break;
 716       nOffset = ME_CallWordBreakProc(editor, pRun->member.run.strText,
 717                                      nOffset, WB_MOVEWORDRIGHT);
 718       if (nOffset < pRun->member.run.strText->nLen)
 719         break;
 720       pOtherRun = ME_FindItemFwd(pRun, diRunOrParagraphOrEnd);
 721       if (pOtherRun->type == diRun)
 722       {
 723         last_delim = ME_CallWordBreakProc(editor, pRun->member.run.strText,
 724                                           nOffset - 1, WB_ISDELIMITER);
 725         pRun = pOtherRun;
 726         nOffset = 0;
 727       }
 728       else if (pOtherRun->type == diParagraph)
 729       {
 730         if (cursor->pRun == pRun)
 731           pRun = ME_FindItemFwd(pOtherRun, diRun);
 732         nOffset = 0;
 733         break;
 734       }
 735       else /* diTextEnd */
 736       {
 737         if (cursor->pRun == pRun)
 738           return FALSE;
 739         nOffset = 0;
 740         break;
 741       }
 742     }
 743   }
 744   cursor->pRun = pRun;
 745   cursor->nOffset = nOffset;
 746   return TRUE;
 747 }
 748
 749
 750 void
 751 ME_SelectByType(ME_TextEditor *editor, ME_SelectionType selectionType)
 752 {
 753   /* pCursor[0] will be the start of the selection
 754    * pCursor[1] is the other end of the selection range
 755    * pCursor[2] and [3] are the selection anchors that are backed up
 756    * so they are kept when the selection changes for drag selection.
 757    */
 758
 759   editor->nSelectionType = selectionType;
 760   switch(selectionType)
 761   {
 762     case stPosition:
 763       break;
 764     case stWord:
 765       ME_MoveCursorWords(editor, &editor->pCursors[1], +1);
 766       editor->pCursors[0] = editor->pCursors[1];
 767       ME_MoveCursorWords(editor, &editor->pCursors[0], -1);
 768       break;
 769     case stLine:
 770     case stParagraph:
 771     {
 772       ME_DisplayItem *pItem;
 773       ME_DIType fwdSearchType, backSearchType;
 774       if (selectionType == stParagraph) {
 775           backSearchType = diParagraph;
 776           fwdSearchType = diParagraphOrEnd;
 777       } else {
 778           backSearchType = diStartRow;
 779           fwdSearchType = diStartRowOrParagraphOrEnd;
 780       }
 781       pItem = ME_FindItemBack(editor->pCursors[0].pRun, backSearchType);
 782       editor->pCursors[0].pRun = ME_FindItemFwd(pItem, diRun);
 783       editor->pCursors[0].nOffset = 0;
 784
 785       pItem = ME_FindItemFwd(editor->pCursors[0].pRun, fwdSearchType);
 786       assert(pItem);
 787       if (pItem->type == diTextEnd)
 788           editor->pCursors[1].pRun = ME_FindItemBack(pItem, diRun);
 789       else
 790           editor->pCursors[1].pRun = ME_FindItemFwd(pItem, diRun);
 791       editor->pCursors[1].nOffset = 0;
 792       break;
 793     }
 794     case stDocument:
 795       /* Select everything with cursor anchored from the start of the text */
 796       editor->nSelectionType = stDocument;
 797       editor->pCursors[1].pRun = ME_FindItemFwd(editor->pBuffer->pFirst, diRun);
 798       editor->pCursors[1].nOffset = 0;
 799       editor->pCursors[0].pRun = ME_FindItemBack(editor->pBuffer->pLast, diRun);
 800       editor->pCursors[0].nOffset = 0;
 801       break;
 802     default: assert(0);
 803   }
 804   /* Store the anchor positions for extending the selection. */
 805   editor->pCursors[2] = editor->pCursors[0];
 806   editor->pCursors[3] = editor->pCursors[1];
 807 }
 808
 809
 810 int ME_GetCursorOfs(ME_TextEditor *editor, int nCursor)
 811 {
 812   ME_Cursor *pCursor = &editor->pCursors[nCursor];
 813   return ME_GetParagraph(pCursor->pRun)->member.para.nCharOfs
 814     + pCursor->pRun->member.run.nCharOfs + pCursor->nOffset;
 815 }
 816
 817 static void ME_FindPixelPos(ME_TextEditor *editor, int x, int y, ME_Cursor *result, BOOL *is_eol)
 818 {
 819   ME_DisplayItem *p = editor->pBuffer->pFirst->member.para.next_para;
 820   ME_DisplayItem *last = NULL;
 821   int rx = 0;
 822
 823   if (is_eol)
 824     *is_eol = 0;
 825
 826   /* find paragraph */
 827   for (; p != editor->pBuffer->pLast; p = p->member.para.next_para)
 828   {
 829     assert(p->type == diParagraph);
 830     if (y < p->member.para.nYPos + p->member.para.nHeight)
 831     {
 832       y -= p->member.para.nYPos;
 833       p = ME_FindItemFwd(p, diStartRow);
 834       break;
 835     }
 836   }
 837   /* find row */
 838   for (; p != editor->pBuffer->pLast; )
 839   {
 840     ME_DisplayItem *pp;
 841     assert(p->type == diStartRow);
 842     if (y < p->member.row.nYPos + p->member.row.nHeight)
 843     {
 844         p = ME_FindItemFwd(p, diRun);
 845         break;
 846     }
 847     pp = ME_FindItemFwd(p, diStartRowOrParagraphOrEnd);
 848     if (pp->type != diStartRow)
 849     {
 850         p = ME_FindItemFwd(p, diRun);
 851         break;
 852     }
 853     p = pp;
 854   }
 855   if (p == editor->pBuffer->pLast)
 856   {
 857     /* The position is below the last paragraph, so the last row will be used
 858      * rather than the end of the text, so the x position will be used to
 859      * determine the offset closest to the pixel position. */
 860     p = ME_FindItemBack(p, diStartRow);
 861     if (p != NULL){
 862       p = ME_FindItemFwd(p, diRun);
 863     }
 864     else
 865     {
 866       p = editor->pBuffer->pLast;
 867     }
 868   }
 869   for (; p != editor->pBuffer->pLast; p = p->next)
 870   {
 871     switch (p->type)
 872     {
 873     case diRun:
 874       rx = x - p->member.run.pt.x;
 875       if (rx < p->member.run.nWidth)
 876       {
 877       found_here:
 878         assert(p->type == diRun);
 879         if ((p->member.run.nFlags & MERF_ENDPARA) || rx < 0)
 880           rx = 0;
 881         result->pRun = p;
 882         result->nOffset = ME_CharFromPointCursor(editor, rx, &p->member.run);
 883         if (editor->pCursors[0].nOffset == p->member.run.strText->nLen && rx)
 884         {
 885           result->pRun = ME_FindItemFwd(editor->pCursors[0].pRun, diRun);
 886           result->nOffset = 0;
 887         }
 888         return;
 889       }
 890       break;
 891     case diStartRow:
 892       p = ME_FindItemFwd(p, diRun);
 893       if (is_eol) *is_eol = 1;
 894       rx = 0; /* FIXME not sure */
 895       goto found_here;
 896     case diParagraph:
 897     case diTextEnd:
 898       rx = 0; /* FIXME not sure */
 899       p = last;
 900       goto found_here;
 901     default: assert(0);
 902     }
 903     last = p;
 904   }
 905   result->pRun = ME_FindItemBack(p, diRun);
 906   result->nOffset = 0;
 907   assert(result->pRun->member.run.nFlags & MERF_ENDPARA);
 908 }
 909
 910
 911 int
 912 ME_CharFromPos(ME_TextEditor *editor, int x, int y)
 913 {
 914   ME_Cursor cursor;
 915   RECT rc;
 916
 917   GetClientRect(editor->hWnd, &rc);
 918   if (x < 0 || y < 0 || x >= rc.right || y >= rc.bottom)
 919     return -1;
 920   y += ME_GetYScrollPos(editor);
 921   ME_FindPixelPos(editor, x, y, &cursor, NULL);
 922   return (ME_GetParagraph(cursor.pRun)->member.para.nCharOfs
 923           + cursor.pRun->member.run.nCharOfs + cursor.nOffset);
 924 }
 925
 926 /* Extends the selection with a word, line, or paragraph selection type.
 927  *
 928  * The selection is anchored by editor->pCursors[2-3] such that the text
 929  * between the anchors will remain selected, and one end will be extended.
 930  *
 931  * editor->pCursors[0] should have the position to extend the selection to
 932  * before this function is called.
 933  *
 934  * Nothing will be done if editor->nSelectionType equals stPosition.
 935  */
 936 static void ME_ExtendAnchorSelection(ME_TextEditor *editor)
 937 {
 938   ME_Cursor tmp_cursor;
 939   int curOfs, anchorStartOfs, anchorEndOfs;
 940   if (editor->nSelectionType == stPosition || editor->nSelectionType == stDocument)
 941       return;
 942   curOfs = ME_GetCursorOfs(editor, 0);
 943   anchorStartOfs = ME_GetCursorOfs(editor, 2);
 944   anchorEndOfs = ME_GetCursorOfs(editor, 3);
 945
 946   tmp_cursor = editor->pCursors[0];
 947   editor->pCursors[0] = editor->pCursors[2];
 948   editor->pCursors[1] = editor->pCursors[3];
 949   if (curOfs < anchorStartOfs)
 950   {
 951       /* Extend the left side of selection */
 952       editor->pCursors[0] = tmp_cursor;
 953       if (editor->nSelectionType == stWord)
 954           ME_MoveCursorWords(editor, &editor->pCursors[0], -1);
 955       else
 956       {
 957           ME_DisplayItem *pItem;
 958           ME_DIType searchType = ((editor->nSelectionType == stLine) ?
 959                                   diStartRowOrParagraph:diParagraph);
 960           pItem = ME_FindItemBack(editor->pCursors[0].pRun, searchType);
 961           editor->pCursors[0].pRun = ME_FindItemFwd(pItem, diRun);
 962           editor->pCursors[0].nOffset = 0;
 963       }
 964   }
 965   else if (curOfs >= anchorEndOfs)
 966   {
 967       /* Extend the right side of selection */
 968       editor->pCursors[1] = tmp_cursor;
 969       if (editor->nSelectionType == stWord)
 970           ME_MoveCursorWords(editor, &editor->pCursors[1], +1);
 971       else
 972       {
 973           ME_DisplayItem *pItem;
 974           ME_DIType searchType = ((editor->nSelectionType == stLine) ?
 975                                   diStartRowOrParagraphOrEnd:diParagraphOrEnd);
 976           pItem = ME_FindItemFwd(editor->pCursors[1].pRun, searchType);
 977           if (pItem->type == diTextEnd)
 978               editor->pCursors[1].pRun = ME_FindItemBack(pItem, diRun);
 979           else
 980               editor->pCursors[1].pRun = ME_FindItemFwd(pItem, diRun);
 981           editor->pCursors[1].nOffset = 0;
 982       }
 983   }
 984 }
 985
 986 void ME_LButtonDown(ME_TextEditor *editor, int x, int y, int clickNum)
 987 {
 988   ME_Cursor tmp_cursor;
 989   int is_selection = 0;
 990   BOOL is_shift;
 991
 992   editor->nUDArrowX = -1;
 993
 994   y += ME_GetYScrollPos(editor);
 995
 996   tmp_cursor = editor->pCursors[0];
 997   is_selection = ME_IsSelection(editor);
 998   is_shift = GetKeyState(VK_SHIFT) < 0;
 999
1000   ME_FindPixelPos(editor, x, y, &editor->pCursors[0], &editor->bCaretAtEnd);
1001
1002   if (x >= editor->selofs || is_shift)
1003   {
1004     if (clickNum > 1)
1005     {
1006       editor->pCursors[1] = editor->pCursors[0];
1007       if (is_shift) {
1008           if (x >= editor->selofs)
1009               ME_SelectByType(editor, stWord);
1010           else
1011               ME_SelectByType(editor, stParagraph);
1012       } else if (clickNum % 2 == 0) {
1013           ME_SelectByType(editor, stWord);
1014       } else {
1015           ME_SelectByType(editor, stParagraph);
1016       }
1017     }
1018     else if (!is_shift)
1019     {
1020       editor->nSelectionType = stPosition;
1021       editor->pCursors[1] = editor->pCursors[0];
1022     }
1023     else if (!is_selection)
1024     {
1025       editor->nSelectionType = stPosition;
1026       editor->pCursors[1] = tmp_cursor;
1027     }
1028     else if (editor->nSelectionType != stPosition)
1029     {
1030       ME_ExtendAnchorSelection(editor);
1031     }
1032   }
1033   else
1034   {
1035     if (clickNum < 2) {
1036         ME_SelectByType(editor, stLine);
1037     } else if (clickNum % 2 == 0 || is_shift) {
1038         ME_SelectByType(editor, stParagraph);
1039     } else {
1040         ME_SelectByType(editor, stDocument);
1041     }
1042   }
1043   ME_InvalidateSelection(editor);
1044   HideCaret(editor->hWnd);
1045   ME_ShowCaret(editor);
1046   ME_ClearTempStyle(editor);
1047   ME_SendSelChange(editor);
1048 }
1049
1050 void ME_MouseMove(ME_TextEditor *editor, int x, int y)
1051 {
1052   ME_Cursor tmp_cursor;
1053
1054   if (editor->nSelectionType == stDocument)
1055       return;
1056   y += ME_GetYScrollPos(editor);
1057
1058   tmp_cursor = editor->pCursors[0];
1059   /* FIXME: do something with the return value of ME_FindPixelPos */
1060   ME_FindPixelPos(editor, x, y, &tmp_cursor, &editor->bCaretAtEnd);
1061
1062   ME_InvalidateSelection(editor);
1063   editor->pCursors[0] = tmp_cursor;
1064   ME_ExtendAnchorSelection(editor);
1065
1066   if (editor->nSelectionType != stPosition &&
1067       memcmp(&editor->pCursors[1], &editor->pCursors[3], sizeof(ME_Cursor)))
1068   {
1069       /* The scroll the cursor towards the other end, since it was the one
1070        * extended by ME_ExtendAnchorSelection
1071        */
1072       ME_Cursor tmpCursor = editor->pCursors[0];
1073       editor->pCursors[0] = editor->pCursors[1];
1074       editor->pCursors[1] = tmpCursor;
1075       SendMessageW(editor->hWnd, EM_SCROLLCARET, 0, 0);
1076       editor->pCursors[1] = editor->pCursors[0];
1077       editor->pCursors[0] = tmpCursor;
1078   } else {
1079       SendMessageW(editor->hWnd, EM_SCROLLCARET, 0, 0);
1080   }
1081
1082   ME_InvalidateSelection(editor);
1083   HideCaret(editor->hWnd);
1084   ME_ShowCaret(editor);
1085   ME_SendSelChange(editor);
1086 }
1087
1088 static ME_DisplayItem *ME_FindRunInRow(ME_TextEditor *editor, ME_DisplayItem *pRow,
1089                                 int x, int *pOffset, int *pbCaretAtEnd)
1090 {
1091   ME_DisplayItem *pNext, *pLastRun;
1092   pNext = ME_FindItemFwd(pRow, diRunOrStartRow);
1093   assert(pNext->type == diRun);
1094   pLastRun = pNext;
1095   if (pbCaretAtEnd) *pbCaretAtEnd = FALSE;
1096   if (pOffset) *pOffset = 0;
1097   do {
1098     int run_x = pNext->member.run.pt.x;
1099     int width = pNext->member.run.nWidth;
1100     if (x < run_x)
1101     {
1102       return pNext;
1103     }
1104     if (x >= run_x && x < run_x+width)
1105     {
1106       int ch = ME_CharFromPointCursor(editor, x-run_x, &pNext->member.run);
1107       ME_String *s = pNext->member.run.strText;
1108       if (ch < s->nLen) {
1109         if (pOffset)
1110           *pOffset = ch;
1111         return pNext;
1112       }
1113     }
1114     pLastRun = pNext;
1115     pNext = ME_FindItemFwd(pNext, diRunOrStartRow);
1116   } while(pNext && pNext->type == diRun);
1117
1118   if ((pLastRun->member.run.nFlags & MERF_ENDPARA) == 0)
1119   {
1120     pNext = ME_FindItemFwd(pNext, diRun);
1121     if (pbCaretAtEnd) *pbCaretAtEnd = TRUE;
1122     return pNext;
1123   } else {
1124     return pLastRun;
1125   }
1126 }
1127
1128 static int ME_GetXForArrow(ME_TextEditor *editor, ME_Cursor *pCursor)
1129 {
1130   ME_DisplayItem *pRun = pCursor->pRun;
1131   int x;
1132
1133   if (editor->nUDArrowX != -1)
1134     x = editor->nUDArrowX;
1135   else {
1136     if (editor->bCaretAtEnd)
1137     {
1138       pRun = ME_FindItemBack(pRun, diRun);
1139       assert(pRun);
1140       x = pRun->member.run.pt.x + pRun->member.run.nWidth;
1141     }
1142     else {
1143       x = pRun->member.run.pt.x;
1144       x += ME_PointFromChar(editor, &pRun->member.run, pCursor->nOffset);
1145     }
1146     editor->nUDArrowX = x;
1147   }
1148   return x;
1149 }
1150
1151
1152 static void
1153 ME_MoveCursorLines(ME_TextEditor *editor, ME_Cursor *pCursor, int nRelOfs)
1154 {
1155   ME_DisplayItem *pRun = pCursor->pRun;
1156   ME_DisplayItem *pItem;
1157   int x = ME_GetXForArrow(editor, pCursor);
1158
1159   if (editor->bCaretAtEnd && !pCursor->nOffset)
1160     pRun = ME_FindItemBack(pRun, diRun);
1161   if (!pRun)
1162     return;
1163   if (nRelOfs == -1)
1164   {
1165     /* start of this row */
1166     pItem = ME_FindItemBack(pRun, diStartRow);
1167     assert(pItem);
1168     /* start of the previous row */
1169     pItem = ME_FindItemBack(pItem, diStartRow);
1170   }
1171   else
1172   {
1173     /* start of the next row */
1174     pItem = ME_FindItemFwd(pRun, diStartRow);
1175     /* FIXME If diParagraph is before diStartRow, wrap the next paragraph?
1176     */
1177   }
1178   if (!pItem)
1179   {
1180     /* row not found - ignore */
1181     return;
1182   }
1183   pCursor->pRun = ME_FindRunInRow(editor, pItem, x, &pCursor->nOffset, &editor->bCaretAtEnd);
1184   assert(pCursor->pRun);
1185   assert(pCursor->pRun->type == diRun);
1186 }
1187
1188
1189 static void ME_ArrowPageUp(ME_TextEditor *editor, ME_Cursor *pCursor)
1190 {
1191   ME_DisplayItem *pRun = pCursor->pRun;
1192   ME_DisplayItem *pLast, *p;
1193   int x, y, ys, yd, yp, yprev;
1194   ME_Cursor tmp_curs = *pCursor;
1195
1196   x = ME_GetXForArrow(editor, pCursor);
1197   if (!pCursor->nOffset && editor->bCaretAtEnd)
1198     pRun = ME_FindItemBack(pRun, diRun);
1199
1200   p = ME_FindItemBack(pRun, diStartRowOrParagraph);
1201   assert(p->type == diStartRow);
1202   yp = ME_FindItemBack(p, diParagraph)->member.para.nYPos;
1203   yprev = ys = y = yp + p->member.row.nYPos;
1204   yd = y - editor->sizeWindow.cy;
1205   pLast = p;
1206
1207   do {
1208     p = ME_FindItemBack(p, diStartRowOrParagraph);
1209     if (!p)
1210       break;
1211     if (p->type == diParagraph) { /* crossing paragraphs */
1212       if (p->member.para.prev_para == NULL)
1213         break;
1214       yp = p->member.para.prev_para->member.para.nYPos;
1215       continue;
1216     }
1217     y = yp + p->member.row.nYPos;
1218     if (y < yd)
1219       break;
1220     pLast = p;
1221     yprev = y;
1222   } while(1);
1223
1224   pCursor->pRun = ME_FindRunInRow(editor, pLast, x, &pCursor->nOffset, &editor->bCaretAtEnd);
1225   ME_UpdateSelection(editor, &tmp_curs);
1226   if (yprev < editor->sizeWindow.cy)
1227   {
1228     ME_EnsureVisible(editor, ME_FindItemFwd(editor->pBuffer->pFirst, diRun));
1229     ME_Repaint(editor);
1230   }
1231   else
1232   {
1233     ME_ScrollUp(editor, ys-yprev);
1234   }
1235   assert(pCursor->pRun);
1236   assert(pCursor->pRun->type == diRun);
1237 }
1238
1239 /* FIXME: in the original RICHEDIT, PageDown always scrolls by the same amount
1240    of pixels, even if it makes the scroll bar position exceed its normal maximum.
1241    In such a situation, clicking the scrollbar restores its position back to the
1242    normal range (ie. sets it to (doclength-screenheight)). */
1243
1244 static void ME_ArrowPageDown(ME_TextEditor *editor, ME_Cursor *pCursor)
1245 {
1246   ME_DisplayItem *pRun = pCursor->pRun;
1247   ME_DisplayItem *pLast, *p;
1248   int x, y, ys, yd, yp, yprev;
1249   ME_Cursor tmp_curs = *pCursor;
1250
1251   x = ME_GetXForArrow(editor, pCursor);
1252   if (!pCursor->nOffset && editor->bCaretAtEnd)
1253     pRun = ME_FindItemBack(pRun, diRun);
1254
1255   p = ME_FindItemBack(pRun, diStartRowOrParagraph);
1256   assert(p->type == diStartRow);
1257   yp = ME_FindItemBack(p, diParagraph)->member.para.nYPos;
1258   yprev = ys = y = yp + p->member.row.nYPos;
1259   yd = y + editor->sizeWindow.cy;
1260   pLast = p;
1261
1262   do {
1263     p = ME_FindItemFwd(p, diStartRowOrParagraph);
1264     if (!p)
1265       break;
1266     if (p->type == diParagraph) {
1267       yp = p->member.para.nYPos;
1268       continue;
1269     }
1270     y = yp + p->member.row.nYPos;
1271     if (y >= yd)
1272       break;
1273     pLast = p;
1274     yprev = y;
1275   } while(1);
1276
1277   pCursor->pRun = ME_FindRunInRow(editor, pLast, x, &pCursor->nOffset, &editor->bCaretAtEnd);
1278   ME_UpdateSelection(editor, &tmp_curs);
1279   if (yprev >= editor->nTotalLength-editor->sizeWindow.cy)
1280   {
1281     ME_EnsureVisible(editor, ME_FindItemBack(editor->pBuffer->pLast, diRun));
1282     ME_Repaint(editor);
1283   }
1284   else
1285   {
1286     ME_ScrollUp(editor,ys-yprev);
1287   }
1288   assert(pCursor->pRun);
1289   assert(pCursor->pRun->type == diRun);
1290 }
1291
1292 static void ME_ArrowHome(ME_TextEditor *editor, ME_Cursor *pCursor)
1293 {
1294   ME_DisplayItem *pRow = ME_FindItemBack(pCursor->pRun, diStartRow);
1295   ME_WrapMarkedParagraphs(editor);
1296   if (pRow) {
1297     ME_DisplayItem *pRun;
1298     if (editor->bCaretAtEnd && !pCursor->nOffset) {
1299       pRow = ME_FindItemBack(pRow, diStartRow);
1300       if (!pRow)
1301         return;
1302     }
1303     pRun = ME_FindItemFwd(pRow, diRun);
1304     if (pRun) {
1305       pCursor->pRun = pRun;
1306       pCursor->nOffset = 0;
1307     }
1308   }
1309   editor->bCaretAtEnd = FALSE;
1310 }
1311
1312 static void ME_ArrowCtrlHome(ME_TextEditor *editor, ME_Cursor *pCursor)
1313 {
1314   ME_DisplayItem *pRow = ME_FindItemBack(pCursor->pRun, diTextStart);
1315   if (pRow) {
1316     ME_DisplayItem *pRun = ME_FindItemFwd(pRow, diRun);
1317     if (pRun) {
1318       pCursor->pRun = pRun;
1319       pCursor->nOffset = 0;
1320     }
1321   }
1322 }
1323
1324 static void ME_ArrowEnd(ME_TextEditor *editor, ME_Cursor *pCursor)
1325 {
1326   ME_DisplayItem *pRow;
1327
1328   if (editor->bCaretAtEnd && !pCursor->nOffset)
1329     return;
1330
1331   pRow = ME_FindItemFwd(pCursor->pRun, diStartRowOrParagraphOrEnd);
1332   assert(pRow);
1333   if (pRow->type == diStartRow) {
1334     /* FIXME WTF was I thinking about here ? */
1335     ME_DisplayItem *pRun = ME_FindItemFwd(pRow, diRun);
1336     assert(pRun);
1337     pCursor->pRun = pRun;
1338     pCursor->nOffset = 0;
1339     editor->bCaretAtEnd = 1;
1340     return;
1341   }
1342   pCursor->pRun = ME_FindItemBack(pRow, diRun);
1343   assert(pCursor->pRun && pCursor->pRun->member.run.nFlags & MERF_ENDPARA);
1344   pCursor->nOffset = 0;
1345   editor->bCaretAtEnd = FALSE;
1346 }
1347
1348 static void ME_ArrowCtrlEnd(ME_TextEditor *editor, ME_Cursor *pCursor)
1349 {
1350   ME_DisplayItem *p = ME_FindItemFwd(pCursor->pRun, diTextEnd);
1351   assert(p);
1352   p = ME_FindItemBack(p, diRun);
1353   assert(p);
1354   assert(p->member.run.nFlags & MERF_ENDPARA);
1355   pCursor->pRun = p;
1356   pCursor->nOffset = 0;
1357   editor->bCaretAtEnd = FALSE;
1358 }
1359
1360 BOOL ME_IsSelection(ME_TextEditor *editor)
1361 {
1362   return memcmp(&editor->pCursors[0], &editor->pCursors[1], sizeof(ME_Cursor))!=0;
1363 }
1364
1365 static int ME_GetSelCursor(ME_TextEditor *editor, int dir)
1366 {
1367   int cdir = ME_GetCursorOfs(editor, 0) - ME_GetCursorOfs(editor, 1);
1368
1369   if (cdir*dir>0)
1370     return 0;
1371   else
1372     return 1;
1373 }
1374
1375 BOOL ME_UpdateSelection(ME_TextEditor *editor, const ME_Cursor *pTempCursor)
1376 {
1377   ME_Cursor old_anchor = editor->pCursors[1];
1378
1379   if (GetKeyState(VK_SHIFT)>=0) /* cancelling selection */
1380   {
1381     /* any selection was present ? if so, it's no more, repaint ! */
1382     editor->pCursors[1] = editor->pCursors[0];
1383     if (memcmp(pTempCursor, &old_anchor, sizeof(ME_Cursor))) {
1384       return TRUE;
1385     }
1386     return FALSE;
1387   }
1388   else
1389   {
1390     if (!memcmp(pTempCursor, &editor->pCursors[1], sizeof(ME_Cursor))) /* starting selection */
1391     {
1392       editor->pCursors[1] = *pTempCursor;
1393       return TRUE;
1394     }
1395   }
1396
1397   ME_Repaint(editor);
1398   return TRUE;
1399 }
1400
1401 void ME_DeleteSelection(ME_TextEditor *editor)
1402 {
1403   int from, to;
1404   ME_GetSelection(editor, &from, &to);
1405   ME_DeleteTextAtCursor(editor, ME_GetSelCursor(editor,-1), to-from);
1406 }
1407
1408 ME_Style *ME_GetSelectionInsertStyle(ME_TextEditor *editor)
1409 {
1410   return ME_GetInsertStyle(editor, 0);
1411 }
1412
1413 void ME_SendSelChange(ME_TextEditor *editor)
1414 {
1415   SELCHANGE sc;
1416
1417   if (!(editor->nEventMask & ENM_SELCHANGE))
1418     return;
1419
1420   sc.nmhdr.hwndFrom = editor->hWnd;
1421   sc.nmhdr.idFrom = GetWindowLongW(editor->hWnd, GWLP_ID);
1422   sc.nmhdr.code = EN_SELCHANGE;
1423   SendMessageW(editor->hWnd, EM_EXGETSEL, 0, (LPARAM)&sc.chrg);
1424   sc.seltyp = SEL_EMPTY;
1425   if (sc.chrg.cpMin != sc.chrg.cpMax)
1426     sc.seltyp |= SEL_TEXT;
1427   if (sc.chrg.cpMin < sc.chrg.cpMax+1) /* wth were RICHEDIT authors thinking ? */
1428     sc.seltyp |= SEL_MULTICHAR;
1429   TRACE("cpMin=%d cpMax=%d seltyp=%d (%s %s)\n",
1430     sc.chrg.cpMin, sc.chrg.cpMax, sc.seltyp,
1431     (sc.seltyp & SEL_TEXT) ? "SEL_TEXT" : "",
1432     (sc.seltyp & SEL_MULTICHAR) ? "SEL_MULTICHAR" : "");
1433   if (sc.chrg.cpMin != editor->notified_cr.cpMin || sc.chrg.cpMax != editor->notified_cr.cpMax)
1434   {
1435     ME_ClearTempStyle(editor);
1436
1437     editor->notified_cr = sc.chrg;
1438     SendMessageW(GetParent(editor->hWnd), WM_NOTIFY, sc.nmhdr.idFrom, (LPARAM)&sc);
1439   }
1440 }
1441
1442 BOOL
1443 ME_ArrowKey(ME_TextEditor *editor, int nVKey, BOOL extend, BOOL ctrl)
1444 {
1445   int nCursor = 0;
1446   ME_Cursor *p = &editor->pCursors[nCursor];
1447   ME_Cursor tmp_curs = *p;
1448   BOOL success = FALSE;
1449
1450   ME_CheckCharOffsets(editor);
1451   switch(nVKey) {
1452     case VK_LEFT:
1453       editor->bCaretAtEnd = 0;
1454       if (ctrl)
1455         success = ME_MoveCursorWords(editor, &tmp_curs, -1);
1456       else
1457         success = ME_MoveCursorChars(editor, &tmp_curs, -1);
1458       break;
1459     case VK_RIGHT:
1460       editor->bCaretAtEnd = 0;
1461       if (ctrl)
1462         success = ME_MoveCursorWords(editor, &tmp_curs, +1);
1463       else
1464         success = ME_MoveCursorChars(editor, &tmp_curs, +1);
1465       break;
1466     case VK_UP:
1467       ME_MoveCursorLines(editor, &tmp_curs, -1);
1468       break;
1469     case VK_DOWN:
1470       ME_MoveCursorLines(editor, &tmp_curs, +1);
1471       break;
1472     case VK_PRIOR:
1473       ME_ArrowPageUp(editor, &tmp_curs);
1474       break;
1475     case VK_NEXT:
1476       ME_ArrowPageDown(editor, &tmp_curs);
1477       break;
1478     case VK_HOME: {
1479       if (ctrl)
1480         ME_ArrowCtrlHome(editor, &tmp_curs);
1481       else
1482         ME_ArrowHome(editor, &tmp_curs);
1483       editor->bCaretAtEnd = 0;
1484       break;
1485     }
1486     case VK_END:
1487       if (ctrl)
1488         ME_ArrowCtrlEnd(editor, &tmp_curs);
1489       else
1490         ME_ArrowEnd(editor, &tmp_curs);
1491       break;
1492   }
1493
1494   if (!extend)
1495     editor->pCursors[1] = tmp_curs;
1496   *p = tmp_curs;
1497
1498   ME_InvalidateSelection(editor);
1499   ME_Repaint(editor);
1500   HideCaret(editor->hWnd);
1501   ME_EnsureVisible(editor, tmp_curs.pRun);
1502   ME_ShowCaret(editor);
1503   ME_SendSelChange(editor);
1504   return success;
1505 }