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)
 238   {
 239     CreateCaret(editor->hWnd, NULL, 0, height);
 240     SetCaretPos(x, y);
 241   }
 242 }
 243
 244
 245 void ME_ShowCaret(ME_TextEditor *ed)
 246 {
 247   ME_MoveCaret(ed);
 248   if(ed->bHaveFocus)
 249     ShowCaret(ed->hWnd);
 250 }
 251
 252 void ME_HideCaret(ME_TextEditor *ed)
 253 {
 254   if(ed->bHaveFocus)
 255   {
 256     HideCaret(ed->hWnd);
 257     DestroyCaret();
 258   }
 259 }
 260
 261 void ME_InternalDeleteText(ME_TextEditor *editor, int nOfs,
 262   int nChars)
 263 {
 264   ME_Cursor c;
 265   int shift = 0;
 266
 267   while(nChars > 0)
 268   {
 269     ME_Run *run;
 270     ME_CursorFromCharOfs(editor, nOfs, &c);
 271     run = &c.pRun->member.run;
 272     if (run->nFlags & MERF_ENDPARA) {
 273       int eollen = run->nCR + run->nLF;
 274
 275       if (!ME_FindItemFwd(c.pRun, diParagraph))
 276       {
 277         return;
 278       }
 279       ME_JoinParagraphs(editor, ME_GetParagraph(c.pRun));
 280       /* ME_SkipAndPropagateCharOffset(p->pRun, shift); */
 281       ME_CheckCharOffsets(editor);
 282       nChars -= (eollen < nChars) ? eollen : nChars;
 283       continue;
 284     }
 285     else
 286     {
 287       ME_Cursor cursor;
 288       int nIntendedChars = nChars;
 289       int nCharsToDelete = nChars;
 290       int i;
 291       int loc = c.nOffset;
 292
 293       ME_FindItemBack(c.pRun, diParagraph)->member.para.nFlags |= MEPF_REWRAP;
 294
 295       cursor = c;
 296       ME_StrRelPos(run->strText, loc, &nChars);
 297       /* nChars is the number of characters that should be deleted from the
 298          FOLLOWING runs (these AFTER cursor.pRun)
 299          nCharsToDelete is a number of chars to delete from THIS run */
 300       nCharsToDelete -= nChars;
 301       shift -= nCharsToDelete;
 302       TRACE("Deleting %d (intended %d-remaning %d) chars at %d in '%s' (%d)\n",
 303         nCharsToDelete, nIntendedChars, nChars, c.nOffset,
 304         debugstr_w(run->strText->szData), run->strText->nLen);
 305
 306       if (!c.nOffset && ME_StrVLen(run->strText) == nCharsToDelete)
 307       {
 308         /* undo = reinsert whole run */
 309         /* nOfs is a character offset (from the start of the document
 310            to the current (deleted) run */
 311         ME_UndoItem *pUndo = ME_AddUndoItem(editor, diUndoInsertRun, c.pRun);
 312         if (pUndo)
 313           pUndo->di.member.run.nCharOfs = nOfs;
 314       }
 315       else
 316       {
 317         /* undo = reinsert partial run */
 318         ME_UndoItem *pUndo = ME_AddUndoItem(editor, diUndoInsertRun, c.pRun);
 319         if (pUndo) {
 320           ME_DestroyString(pUndo->di.member.run.strText);
 321           pUndo->di.member.run.nCharOfs = nOfs;
 322           pUndo->di.member.run.strText = ME_MakeStringN(run->strText->szData+c.nOffset, nCharsToDelete);
 323         }
 324       }
 325       TRACE("Post deletion string: %s (%d)\n", debugstr_w(run->strText->szData), run->strText->nLen);
 326       TRACE("Shift value: %d\n", shift);
 327       ME_StrDeleteV(run->strText, c.nOffset, nCharsToDelete);
 328
 329       /* update cursors (including c) */
 330       for (i=-1; i<editor->nCursors; i++) {
 331         ME_Cursor *pThisCur = editor->pCursors + i;
 332         if (i == -1) pThisCur = &c;
 333         if (pThisCur->pRun == cursor.pRun) {
 334           if (pThisCur->nOffset > cursor.nOffset) {
 335             if (pThisCur->nOffset-cursor.nOffset < nCharsToDelete)
 336               pThisCur->nOffset = cursor.nOffset;
 337             else
 338               pThisCur->nOffset -= nCharsToDelete;
 339             assert(pThisCur->nOffset >= 0);
 340             assert(pThisCur->nOffset <= ME_StrVLen(run->strText));
 341           }
 342           if (pThisCur->nOffset == ME_StrVLen(run->strText))
 343           {
 344             pThisCur->pRun = ME_FindItemFwd(pThisCur->pRun, diRunOrParagraphOrEnd);
 345             assert(pThisCur->pRun->type == diRun);
 346             pThisCur->nOffset = 0;
 347           }
 348         }
 349       }
 350
 351       /* c = updated data now */
 352
 353       if (c.pRun == cursor.pRun)
 354         ME_SkipAndPropagateCharOffset(c.pRun, shift);
 355       else
 356         ME_PropagateCharOffset(c.pRun, shift);
 357
 358       if (!ME_StrVLen(cursor.pRun->member.run.strText))
 359       {
 360         TRACE("Removing useless run\n");
 361         ME_Remove(cursor.pRun);
 362         ME_DestroyDisplayItem(cursor.pRun);
 363       }
 364
 365       shift = 0;
 366       /*
 367       ME_CheckCharOffsets(editor);
 368       */
 369       continue;
 370     }
 371   }
 372 }
 373
 374 void ME_DeleteTextAtCursor(ME_TextEditor *editor, int nCursor,
 375   int nChars)
 376 {
 377   assert(nCursor>=0 && nCursor<editor->nCursors);
 378   /* text operations set modified state */
 379   editor->nModifyStep = 1;
 380   ME_InternalDeleteText(editor, ME_GetCursorOfs(editor, nCursor), nChars);
 381 }
 382
 383 static ME_DisplayItem *
 384 ME_InternalInsertTextFromCursor(ME_TextEditor *editor, int nCursor,
 385                                 const WCHAR *str, int len, ME_Style *style,
 386                                 int flags)
 387 {
 388   ME_Cursor *p = &editor->pCursors[nCursor];
 389
 390   editor->bCaretAtEnd = FALSE;
 391
 392   assert(p->pRun->type == diRun);
 393
 394   return ME_InsertRunAtCursor(editor, p, style, str, len, flags);
 395 }
 396
 397
 398 void ME_InsertOLEFromCursor(ME_TextEditor *editor, const REOBJECT* reo, int nCursor)
 399 {
 400   ME_Style              *pStyle = ME_GetInsertStyle(editor, nCursor);
 401   ME_DisplayItem        *di;
 402   WCHAR                 space = ' ';
 403
 404   /* FIXME no no no */
 405   if (ME_IsSelection(editor))
 406     ME_DeleteSelection(editor);
 407
 408   di = ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, pStyle,
 409                                        MERF_GRAPHICS);
 410   di->member.run.ole_obj = ALLOC_OBJ(*reo);
 411   ME_CopyReObject(di->member.run.ole_obj, reo);
 412   ME_SendSelChange(editor);
 413 }
 414
 415
 416 void ME_InsertEndRowFromCursor(ME_TextEditor *editor, int nCursor)
 417 {
 418   ME_Style              *pStyle = ME_GetInsertStyle(editor, nCursor);
 419   ME_DisplayItem        *di;
 420   WCHAR                 space = ' ';
 421
 422   /* FIXME no no no */
 423   if (ME_IsSelection(editor))
 424     ME_DeleteSelection(editor);
 425
 426   di = ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, pStyle,
 427                                        MERF_ENDROW);
 428   ME_SendSelChange(editor);
 429 }
 430
 431 void
 432 ME_InsertTableCellFromCursor(ME_TextEditor *editor, int nCursor)
 433 {
 434   WCHAR tab = '\t';
 435   ME_DisplayItem *p, *run;
 436   ME_Style *pStyle = ME_GetInsertStyle(editor, nCursor);
 437
 438   p = ME_InternalInsertTextFromCursor(editor, nCursor, &tab, 1, pStyle,
 439                                       MERF_CELL);
 440   run = p;
 441   while ((run = ME_FindItemBack(run, diRunOrParagraph))->type == diRun)
 442   {
 443     if (run->member.run.nFlags & MERF_CELL)
 444     {
 445       assert(run->member.run.pCell->next);
 446       p->member.run.pCell = run->member.run.pCell->next;
 447       return;
 448     }
 449   }
 450   assert(run->type == diParagraph);
 451   assert(run->member.para.bTable);
 452   assert(run->member.para.pCells);
 453   p->member.run.pCell = run->member.para.pCells;
 454 }
 455
 456
 457 void ME_InsertTextFromCursor(ME_TextEditor *editor, int nCursor,
 458   const WCHAR *str, int len, ME_Style *style)
 459 {
 460   const WCHAR *pos;
 461   ME_Cursor *p = NULL;
 462   int oldLen;
 463
 464   /* FIXME really HERE ? */
 465   if (ME_IsSelection(editor))
 466     ME_DeleteSelection(editor);
 467
 468   /* FIXME: is this too slow? */
 469   /* Didn't affect performance for WM_SETTEXT (around 50sec/30K) */
 470   oldLen = ME_GetTextLength(editor);
 471
 472   /* text operations set modified state */
 473   editor->nModifyStep = 1;
 474
 475   assert(style);
 476
 477   assert(nCursor>=0 && nCursor<editor->nCursors);
 478   if (len == -1)
 479     len = lstrlenW(str);
 480
 481   /* grow the text limit to fit our text */
 482   if(editor->nTextLimit < oldLen +len)
 483     editor->nTextLimit = oldLen + len;
 484
 485   while (len)
 486   {
 487     pos = str;
 488     /* FIXME this sucks - no respect for unicode (what else can be a line separator in unicode?) */
 489     while(pos-str < len && *pos != '\r' && *pos != '\n' && *pos != '\t')
 490       pos++;
 491     if (pos-str < len && *pos == '\t') { /* handle tabs */
 492       WCHAR tab = '\t';
 493
 494       if (pos!=str)
 495         ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
 496
 497       ME_InternalInsertTextFromCursor(editor, nCursor, &tab, 1, style, MERF_TAB);
 498
 499       pos++;
 500       if(pos-str <= len) {
 501         len -= pos - str;
 502         str = pos;
 503         continue;
 504       }
 505     }
 506     /* handle special \r\r\n sequence (richedit 2.x and higher only) */
 507     if (!editor->bEmulateVersion10 && pos-str < len-2 && pos[0] == '\r' && pos[1] == '\r' && pos[2] == '\n') {
 508       WCHAR space = ' ';
 509
 510       if (pos!=str)
 511         ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
 512
 513       ME_InternalInsertTextFromCursor(editor, nCursor, &space, 1, style, 0);
 514
 515       pos+=3;
 516       if(pos-str <= len) {
 517         len -= pos - str;
 518         str = pos;
 519         continue;
 520       }
 521     }
 522     if (pos-str < len) {   /* handle EOLs */
 523       ME_DisplayItem *tp, *end_run;
 524       ME_Style *tmp_style;
 525       int numCR, numLF;
 526
 527       if (pos!=str)
 528         ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
 529       p = &editor->pCursors[nCursor];
 530       if (p->nOffset) {
 531         ME_SplitRunSimple(editor, p->pRun, p->nOffset);
 532         p = &editor->pCursors[nCursor];
 533       }
 534       tmp_style = ME_GetInsertStyle(editor, nCursor);
 535       /* ME_SplitParagraph increases style refcount */
 536
 537       /* Encode and fill number of CR and LF according to emulation mode */
 538       if (editor->bEmulateVersion10) {
 539         const WCHAR * tpos;
 540
 541         /* We have to find out how many consecutive \r are there, and if there
 542            is a \n terminating the run of \r's. */
 543         numCR = 0; numLF = 0;
 544         tpos = pos;
 545         while (tpos-str < len && *tpos == '\r') {
 546           tpos++;
 547           numCR++;
 548         }
 549         if (tpos-str >= len) {
 550           /* Reached end of text without finding anything but '\r' */
 551           if (tpos != pos) {
 552             pos++;
 553           }
 554           numCR = 1; numLF = 0;
 555         } else if (*tpos == '\n') {
 556           /* The entire run of \r's plus the one \n is one single line break */
 557           pos = tpos + 1;
 558           numLF = 1;
 559         } else {
 560           /* Found some other content past the run of \r's */
 561           pos++;
 562           numCR = 1; numLF = 0;
 563         }
 564       } else {
 565         if(pos-str < len && *pos =='\r')
 566           pos++;
 567         if(pos-str < len && *pos =='\n')
 568           pos++;
 569         numCR = 1; numLF = 0;
 570       }
 571       tp = ME_SplitParagraph(editor, p->pRun, p->pRun->member.run.style, numCR, numLF);
 572       p->pRun = ME_FindItemFwd(tp, diRun);
 573       end_run = ME_FindItemBack(tp, diRun);
 574       ME_ReleaseStyle(end_run->member.run.style);
 575       end_run->member.run.style = tmp_style;
 576       p->nOffset = 0;
 577
 578       if(pos-str <= len) {
 579         len -= pos - str;
 580         str = pos;
 581         continue;
 582       }
 583     }
 584     ME_InternalInsertTextFromCursor(editor, nCursor, str, len, style, 0);
 585     len = 0;
 586   }
 587 }
 588
 589
 590 static BOOL
 591 ME_MoveCursorChars(ME_TextEditor *editor, ME_Cursor *pCursor, int nRelOfs)
 592 {
 593   ME_DisplayItem *pRun = pCursor->pRun;
 594
 595   if (nRelOfs == -1)
 596   {
 597     if (!pCursor->nOffset)
 598     {
 599       do {
 600         pRun = ME_FindItemBack(pRun, diRunOrParagraph);
 601         assert(pRun);
 602         switch (pRun->type)
 603         {
 604           case diRun:
 605             break;
 606           case diParagraph:
 607             if (pRun->member.para.prev_para->type == diTextStart)
 608               return FALSE;
 609             pRun = ME_FindItemBack(pRun, diRunOrParagraph);
 610             /* every paragraph ought to have at least one run */
 611             assert(pRun && pRun->type == diRun);
 612             assert(pRun->member.run.nFlags & MERF_ENDPARA);
 613             break;
 614           default:
 615             assert(pRun->type != diRun && pRun->type != diParagraph);
 616             return FALSE;
 617         }
 618       } while (RUN_IS_HIDDEN(&pRun->member.run));
 619       pCursor->pRun = pRun;
 620       if (pRun->member.run.nFlags & MERF_ENDPARA)
 621         pCursor->nOffset = 0;
 622       else
 623         pCursor->nOffset = pRun->member.run.strText->nLen;
 624     }
 625
 626     if (pCursor->nOffset)
 627       pCursor->nOffset = ME_StrRelPos2(pCursor->pRun->member.run.strText, pCursor->nOffset, nRelOfs);
 628     return TRUE;
 629   }
 630   else
 631   {
 632     if (!(pRun->member.run.nFlags & MERF_ENDPARA))
 633     {
 634       int new_ofs = ME_StrRelPos2(pRun->member.run.strText, pCursor->nOffset, nRelOfs);
 635
 636       if (new_ofs < pRun->member.run.strText->nLen)
 637       {
 638         pCursor->nOffset = new_ofs;
 639         return TRUE;
 640       }
 641     }
 642     do {
 643       pRun = ME_FindItemFwd(pRun, diRun);
 644     } while (pRun && RUN_IS_HIDDEN(&pRun->member.run));
 645     if (pRun)
 646     {
 647       pCursor->pRun = pRun;
 648       pCursor->nOffset = 0;
 649       return TRUE;
 650     }
 651   }
 652   return FALSE;
 653 }
 654
 655
 656 static BOOL
 657 ME_MoveCursorWords(ME_TextEditor *editor, ME_Cursor *cursor, int nRelOfs)
 658 {
 659   ME_DisplayItem *pRun = cursor->pRun, *pOtherRun;
 660   int nOffset = cursor->nOffset;
 661
 662   if (nRelOfs == -1)
 663   {
 664     /* Backward movement */
 665     while (TRUE)
 666     {
 667       nOffset = ME_CallWordBreakProc(editor, pRun->member.run.strText,
 668                                      nOffset, WB_MOVEWORDLEFT);
 669        if (nOffset)
 670         break;
 671       pOtherRun = ME_FindItemBack(pRun, diRunOrParagraph);
 672       if (pOtherRun->type == diRun)
 673       {
 674         if (ME_CallWordBreakProc(editor, pOtherRun->member.run.strText,
 675                                  pOtherRun->member.run.strText->nLen - 1,
 676                                  WB_ISDELIMITER)
 677             && !(pRun->member.run.nFlags & MERF_ENDPARA)
 678             && !(cursor->pRun == pRun && cursor->nOffset == 0)
 679             && !ME_CallWordBreakProc(editor, pRun->member.run.strText, 0,
 680                                      WB_ISDELIMITER))
 681           break;
 682         pRun = pOtherRun;
 683         nOffset = pOtherRun->member.run.strText->nLen;
 684       }
 685       else if (pOtherRun->type == diParagraph)
 686       {
 687         if (cursor->pRun == pRun && cursor->nOffset == 0)
 688         {
 689           /* Paragraph breaks are treated as separate words */
 690           if (pOtherRun->member.para.prev_para->type == diTextStart)
 691             return FALSE;
 692           pRun = ME_FindItemBack(pOtherRun, diRunOrParagraph);
 693         }
 694         break;
 695       }
 696     }
 697   }
 698   else
 699   {
 700     /* Forward movement */
 701     BOOL last_delim = FALSE;
 702
 703     while (TRUE)
 704     {
 705       if (last_delim && !ME_CallWordBreakProc(editor, pRun->member.run.strText,
 706                                               nOffset, WB_ISDELIMITER))
 707         break;
 708       nOffset = ME_CallWordBreakProc(editor, pRun->member.run.strText,
 709                                      nOffset, WB_MOVEWORDRIGHT);
 710       if (nOffset < pRun->member.run.strText->nLen)
 711         break;
 712       pOtherRun = ME_FindItemFwd(pRun, diRunOrParagraphOrEnd);
 713       if (pOtherRun->type == diRun)
 714       {
 715         last_delim = ME_CallWordBreakProc(editor, pRun->member.run.strText,
 716                                           nOffset - 1, WB_ISDELIMITER);
 717         pRun = pOtherRun;
 718         nOffset = 0;
 719       }
 720       else if (pOtherRun->type == diParagraph)
 721       {
 722         if (cursor->pRun == pRun)
 723           pRun = ME_FindItemFwd(pOtherRun, diRun);
 724         nOffset = 0;
 725         break;
 726       }
 727       else /* diTextEnd */
 728       {
 729         if (cursor->pRun == pRun)
 730           return FALSE;
 731         nOffset = 0;
 732         break;
 733       }
 734     }
 735   }
 736   cursor->pRun = pRun;
 737   cursor->nOffset = nOffset;
 738   return TRUE;
 739 }
 740
 741
 742 void
 743 ME_SelectWord(ME_TextEditor *editor)
 744 {
 745   if (!(editor->pCursors[0].pRun->member.run.nFlags & MERF_ENDPARA))
 746     ME_MoveCursorWords(editor, &editor->pCursors[0], -1);
 747   ME_MoveCursorWords(editor, &editor->pCursors[1], +1);
 748   ME_InvalidateSelection(editor);
 749   ME_SendSelChange(editor);
 750 }
 751
 752
 753 int ME_GetCursorOfs(ME_TextEditor *editor, int nCursor)
 754 {
 755   ME_Cursor *pCursor = &editor->pCursors[nCursor];
 756   return ME_GetParagraph(pCursor->pRun)->member.para.nCharOfs
 757     + pCursor->pRun->member.run.nCharOfs + pCursor->nOffset;
 758 }
 759
 760 static void ME_FindPixelPos(ME_TextEditor *editor, int x, int y, ME_Cursor *result, BOOL *is_eol)
 761 {
 762   ME_DisplayItem *p = editor->pBuffer->pFirst->member.para.next_para;
 763   ME_DisplayItem *last = NULL;
 764   int rx = 0;
 765
 766   if (is_eol)
 767     *is_eol = 0;
 768
 769   /* find paragraph */
 770   for (; p != editor->pBuffer->pLast; p = p->member.para.next_para)
 771   {
 772     assert(p->type == diParagraph);
 773     if (y < p->member.para.nYPos + p->member.para.nHeight)
 774     {
 775       y -= p->member.para.nYPos;
 776       p = ME_FindItemFwd(p, diStartRow);
 777       break;
 778     }
 779   }
 780   /* find row */
 781   for (; p != editor->pBuffer->pLast; )
 782   {
 783     ME_DisplayItem *pp;
 784     assert(p->type == diStartRow);
 785     if (y < p->member.row.nYPos + p->member.row.nHeight)
 786     {
 787         p = ME_FindItemFwd(p, diRun);
 788         break;
 789     }
 790     pp = ME_FindItemFwd(p, diStartRowOrParagraphOrEnd);
 791     if (pp->type != diStartRow)
 792     {
 793         p = ME_FindItemFwd(p, diRun);
 794         break;
 795     }
 796     p = pp;
 797   }
 798   for (; p != editor->pBuffer->pLast; p = p->next)
 799   {
 800     switch (p->type)
 801     {
 802     case diRun:
 803       rx = x - p->member.run.pt.x;
 804       if (rx < p->member.run.nWidth)
 805       {
 806       found_here:
 807         assert(p->type == diRun);
 808         if ((p->member.run.nFlags & MERF_ENDPARA) || rx < 0)
 809           rx = 0;
 810         result->pRun = p;
 811         result->nOffset = ME_CharFromPointCursor(editor, rx, &p->member.run);
 812         if (editor->pCursors[0].nOffset == p->member.run.strText->nLen && rx)
 813         {
 814           result->pRun = ME_FindItemFwd(editor->pCursors[0].pRun, diRun);
 815           result->nOffset = 0;
 816         }
 817         return;
 818       }
 819       break;
 820     case diStartRow:
 821       p = ME_FindItemFwd(p, diRun);
 822       if (is_eol) *is_eol = 1;
 823       rx = 0; /* FIXME not sure */
 824       goto found_here;
 825     case diParagraph:
 826     case diTextEnd:
 827       rx = 0; /* FIXME not sure */
 828       p = last;
 829       goto found_here;
 830     default: assert(0);
 831     }
 832     last = p;
 833   }
 834   result->pRun = ME_FindItemBack(p, diRun);
 835   result->nOffset = 0;
 836   assert(result->pRun->member.run.nFlags & MERF_ENDPARA);
 837 }
 838
 839
 840 int
 841 ME_CharFromPos(ME_TextEditor *editor, int x, int y)
 842 {
 843   ME_Cursor cursor;
 844   RECT rc;
 845
 846   GetClientRect(editor->hWnd, &rc);
 847   if (x < 0 || y < 0 || x >= rc.right || y >= rc.bottom)
 848     return -1;
 849   y += ME_GetYScrollPos(editor);
 850   ME_FindPixelPos(editor, x, y, &cursor, NULL);
 851   return (ME_GetParagraph(cursor.pRun)->member.para.nCharOfs
 852           + cursor.pRun->member.run.nCharOfs + cursor.nOffset);
 853 }
 854
 855
 856 void ME_LButtonDown(ME_TextEditor *editor, int x, int y)
 857 {
 858   ME_Cursor tmp_cursor;
 859   int is_selection = 0;
 860
 861   editor->nUDArrowX = -1;
 862
 863   y += ME_GetYScrollPos(editor);
 864
 865   tmp_cursor = editor->pCursors[0];
 866   is_selection = ME_IsSelection(editor);
 867
 868   if (x >= editor->selofs)
 869   {
 870     ME_FindPixelPos(editor, x, y, &editor->pCursors[0], &editor->bCaretAtEnd);
 871     if (GetKeyState(VK_SHIFT)>=0)
 872     {
 873       editor->pCursors[1] = editor->pCursors[0];
 874     }
 875     else if (!is_selection) {
 876       editor->pCursors[1] = tmp_cursor;
 877       is_selection = 1;
 878     }
 879
 880     ME_InvalidateSelection(editor);
 881     HideCaret(editor->hWnd);
 882     ME_MoveCaret(editor);
 883     ShowCaret(editor->hWnd);
 884     ME_ClearTempStyle(editor);
 885     ME_SendSelChange(editor);
 886   }
 887   else
 888   {
 889     ME_DisplayItem *pRow;
 890
 891     editor->linesel = 1;
 892     editor->sely = y;
 893     /* Set pCursors[0] to beginning of line */
 894     ME_FindPixelPos(editor, x, y, &editor->pCursors[1], &editor->bCaretAtEnd);
 895     /* Set pCursors[1] to end of line */
 896     pRow = ME_FindItemFwd(editor->pCursors[1].pRun, diStartRowOrParagraphOrEnd);
 897     assert(pRow);
 898     /* pCursor[0] is the position where the cursor will be drawn,
 899      * pCursor[1] is the other end of the selection range
 900      * pCursor[2] and [3] are backups of [0] and [1] so I
 901      * don't have to look them up again
 902      */
 903
 904     if (pRow->type == diStartRow) {
 905       /* FIXME WTF was I thinking about here ? */
 906       ME_DisplayItem *pRun = ME_FindItemFwd(pRow, diRun);
 907       assert(pRun);
 908       editor->pCursors[0].pRun = pRun;
 909       editor->pCursors[0].nOffset = 0;
 910       editor->bCaretAtEnd = 1;
 911     } else {
 912       editor->pCursors[0].pRun = ME_FindItemBack(pRow, diRun);
 913       assert(editor->pCursors[0].pRun && editor->pCursors[0].pRun->member.run.nFlags & MERF_ENDPARA);
 914       editor->pCursors[0].nOffset = 0;
 915       editor->bCaretAtEnd = 0;
 916     }
 917     editor->pCursors[2] = editor->pCursors[0];
 918     editor->pCursors[3] = editor->pCursors[1];
 919     ME_InvalidateSelection(editor);
 920     HideCaret(editor->hWnd);
 921     ME_MoveCaret(editor);
 922     ShowCaret(editor->hWnd);
 923     ME_ClearTempStyle(editor);
 924     ME_SendSelChange(editor);
 925   }
 926 }
 927
 928 void ME_MouseMove(ME_TextEditor *editor, int x, int y)
 929 {
 930   ME_Cursor tmp_cursor;
 931
 932   y += ME_GetYScrollPos(editor);
 933
 934   tmp_cursor = editor->pCursors[0];
 935   /* FIXME: do something with the return value of ME_FindPixelPos */
 936   if (!editor->linesel)
 937     ME_FindPixelPos(editor, x, y, &tmp_cursor, &editor->bCaretAtEnd);
 938   else ME_FindPixelPos(editor, (y > editor->sely) * editor->rcFormat.right, y, &tmp_cursor, &editor->bCaretAtEnd);
 939
 940   if (!memcmp(&tmp_cursor, editor->pCursors, sizeof(tmp_cursor)))
 941     return;
 942
 943   ME_InvalidateSelection(editor);
 944   if (!editor->linesel)
 945     editor->pCursors[0] = tmp_cursor;
 946   else if (!memcmp(&tmp_cursor, editor->pCursors+2, sizeof(tmp_cursor)) ||
 947            !memcmp(&tmp_cursor, editor->pCursors+3, sizeof(tmp_cursor)))
 948   {
 949     editor->pCursors[0] = editor->pCursors[2];
 950     editor->pCursors[1] = editor->pCursors[3];
 951   }
 952   else if (y < editor->sely)
 953   {
 954     editor->pCursors[0] = tmp_cursor;
 955     editor->pCursors[1] = editor->pCursors[2];
 956   }
 957   else
 958   {
 959     editor->pCursors[0] = tmp_cursor;
 960     editor->pCursors[1] = editor->pCursors[3];
 961   }
 962
 963   HideCaret(editor->hWnd);
 964   ME_MoveCaret(editor);
 965   ME_InvalidateSelection(editor);
 966   ShowCaret(editor->hWnd);
 967   ME_SendSelChange(editor);
 968   SendMessageW(editor->hWnd, EM_SCROLLCARET, 0, 0);
 969 }
 970
 971 static ME_DisplayItem *ME_FindRunInRow(ME_TextEditor *editor, ME_DisplayItem *pRow,
 972                                 int x, int *pOffset, int *pbCaretAtEnd)
 973 {
 974   ME_DisplayItem *pNext, *pLastRun;
 975   pNext = ME_FindItemFwd(pRow, diRunOrStartRow);
 976   assert(pNext->type == diRun);
 977   pLastRun = pNext;
 978   if (pbCaretAtEnd) *pbCaretAtEnd = FALSE;
 979   if (pOffset) *pOffset = 0;
 980   do {
 981     int run_x = pNext->member.run.pt.x;
 982     int width = pNext->member.run.nWidth;
 983     if (x < run_x)
 984     {
 985       return pNext;
 986     }
 987     if (x >= run_x && x < run_x+width)
 988     {
 989       int ch = ME_CharFromPointCursor(editor, x-run_x, &pNext->member.run);
 990       ME_String *s = pNext->member.run.strText;
 991       if (ch < s->nLen) {
 992         if (pOffset)
 993           *pOffset = ch;
 994         return pNext;
 995       }
 996     }
 997     pLastRun = pNext;
 998     pNext = ME_FindItemFwd(pNext, diRunOrStartRow);
 999   } while(pNext && pNext->type == diRun);
1000
1001   if ((pLastRun->member.run.nFlags & MERF_ENDPARA) == 0)
1002   {
1003     pNext = ME_FindItemFwd(pNext, diRun);
1004     if (pbCaretAtEnd) *pbCaretAtEnd = TRUE;
1005     return pNext;
1006   } else {
1007     return pLastRun;
1008   }
1009 }
1010
1011 static int ME_GetXForArrow(ME_TextEditor *editor, ME_Cursor *pCursor)
1012 {
1013   ME_DisplayItem *pRun = pCursor->pRun;
1014   int x;
1015
1016   if (editor->nUDArrowX != -1)
1017     x = editor->nUDArrowX;
1018   else {
1019     if (editor->bCaretAtEnd)
1020     {
1021       pRun = ME_FindItemBack(pRun, diRun);
1022       assert(pRun);
1023       x = pRun->member.run.pt.x + pRun->member.run.nWidth;
1024     }
1025     else {
1026       x = pRun->member.run.pt.x;
1027       x += ME_PointFromChar(editor, &pRun->member.run, pCursor->nOffset);
1028     }
1029     editor->nUDArrowX = x;
1030   }
1031   return x;
1032 }
1033
1034
1035 static void
1036 ME_MoveCursorLines(ME_TextEditor *editor, ME_Cursor *pCursor, int nRelOfs)
1037 {
1038   ME_DisplayItem *pRun = pCursor->pRun;
1039   ME_DisplayItem *pItem;
1040   int x = ME_GetXForArrow(editor, pCursor);
1041
1042   if (editor->bCaretAtEnd && !pCursor->nOffset)
1043     pRun = ME_FindItemBack(pRun, diRun);
1044   if (!pRun)
1045     return;
1046   if (nRelOfs == -1)
1047   {
1048     /* start of this row */
1049     pItem = ME_FindItemBack(pRun, diStartRow);
1050     assert(pItem);
1051     /* start of the previous row */
1052     pItem = ME_FindItemBack(pItem, diStartRow);
1053   }
1054   else
1055   {
1056     /* start of the next row */
1057     pItem = ME_FindItemFwd(pRun, diStartRow);
1058     /* FIXME If diParagraph is before diStartRow, wrap the next paragraph?
1059     */
1060   }
1061   if (!pItem)
1062   {
1063     /* row not found - ignore */
1064     return;
1065   }
1066   pCursor->pRun = ME_FindRunInRow(editor, pItem, x, &pCursor->nOffset, &editor->bCaretAtEnd);
1067   assert(pCursor->pRun);
1068   assert(pCursor->pRun->type == diRun);
1069 }
1070
1071
1072 static void ME_ArrowPageUp(ME_TextEditor *editor, ME_Cursor *pCursor)
1073 {
1074   ME_DisplayItem *pRun = pCursor->pRun;
1075   ME_DisplayItem *pLast, *p;
1076   int x, y, ys, yd, yp, yprev;
1077   ME_Cursor tmp_curs = *pCursor;
1078
1079   x = ME_GetXForArrow(editor, pCursor);
1080   if (!pCursor->nOffset && editor->bCaretAtEnd)
1081     pRun = ME_FindItemBack(pRun, diRun);
1082
1083   p = ME_FindItemBack(pRun, diStartRowOrParagraph);
1084   assert(p->type == diStartRow);
1085   yp = ME_FindItemBack(p, diParagraph)->member.para.nYPos;
1086   yprev = ys = y = yp + p->member.row.nYPos;
1087   yd = y - editor->sizeWindow.cy;
1088   pLast = p;
1089
1090   do {
1091     p = ME_FindItemBack(p, diStartRowOrParagraph);
1092     if (!p)
1093       break;
1094     if (p->type == diParagraph) { /* crossing paragraphs */
1095       if (p->member.para.prev_para == NULL)
1096         break;
1097       yp = p->member.para.prev_para->member.para.nYPos;
1098       continue;
1099     }
1100     y = yp + p->member.row.nYPos;
1101     if (y < yd)
1102       break;
1103     pLast = p;
1104     yprev = y;
1105   } while(1);
1106
1107   pCursor->pRun = ME_FindRunInRow(editor, pLast, x, &pCursor->nOffset, &editor->bCaretAtEnd);
1108   ME_UpdateSelection(editor, &tmp_curs);
1109   if (yprev < editor->sizeWindow.cy)
1110   {
1111     ME_EnsureVisible(editor, ME_FindItemFwd(editor->pBuffer->pFirst, diRun));
1112     ME_Repaint(editor);
1113   }
1114   else
1115   {
1116     ME_ScrollUp(editor, ys-yprev);
1117   }
1118   assert(pCursor->pRun);
1119   assert(pCursor->pRun->type == diRun);
1120 }
1121
1122 /* FIXME: in the original RICHEDIT, PageDown always scrolls by the same amount
1123    of pixels, even if it makes the scroll bar position exceed its normal maximum.
1124    In such a situation, clicking the scrollbar restores its position back to the
1125    normal range (ie. sets it to (doclength-screenheight)). */
1126
1127 static void ME_ArrowPageDown(ME_TextEditor *editor, ME_Cursor *pCursor)
1128 {
1129   ME_DisplayItem *pRun = pCursor->pRun;
1130   ME_DisplayItem *pLast, *p;
1131   int x, y, ys, yd, yp, yprev;
1132   ME_Cursor tmp_curs = *pCursor;
1133
1134   x = ME_GetXForArrow(editor, pCursor);
1135   if (!pCursor->nOffset && editor->bCaretAtEnd)
1136     pRun = ME_FindItemBack(pRun, diRun);
1137
1138   p = ME_FindItemBack(pRun, diStartRowOrParagraph);
1139   assert(p->type == diStartRow);
1140   yp = ME_FindItemBack(p, diParagraph)->member.para.nYPos;
1141   yprev = ys = y = yp + p->member.row.nYPos;
1142   yd = y + editor->sizeWindow.cy;
1143   pLast = p;
1144
1145   do {
1146     p = ME_FindItemFwd(p, diStartRowOrParagraph);
1147     if (!p)
1148       break;
1149     if (p->type == diParagraph) {
1150       yp = p->member.para.nYPos;
1151       continue;
1152     }
1153     y = yp + p->member.row.nYPos;
1154     if (y >= yd)
1155       break;
1156     pLast = p;
1157     yprev = y;
1158   } while(1);
1159
1160   pCursor->pRun = ME_FindRunInRow(editor, pLast, x, &pCursor->nOffset, &editor->bCaretAtEnd);
1161   ME_UpdateSelection(editor, &tmp_curs);
1162   if (yprev >= editor->nTotalLength-editor->sizeWindow.cy)
1163   {
1164     ME_EnsureVisible(editor, ME_FindItemBack(editor->pBuffer->pLast, diRun));
1165     ME_Repaint(editor);
1166   }
1167   else
1168   {
1169     ME_ScrollUp(editor,ys-yprev);
1170   }
1171   assert(pCursor->pRun);
1172   assert(pCursor->pRun->type == diRun);
1173 }
1174
1175 static void ME_ArrowHome(ME_TextEditor *editor, ME_Cursor *pCursor)
1176 {
1177   ME_DisplayItem *pRow = ME_FindItemBack(pCursor->pRun, diStartRow);
1178   ME_WrapMarkedParagraphs(editor);
1179   if (pRow) {
1180     ME_DisplayItem *pRun;
1181     if (editor->bCaretAtEnd && !pCursor->nOffset) {
1182       pRow = ME_FindItemBack(pRow, diStartRow);
1183       if (!pRow)
1184         return;
1185     }
1186     pRun = ME_FindItemFwd(pRow, diRun);
1187     if (pRun) {
1188       pCursor->pRun = pRun;
1189       pCursor->nOffset = 0;
1190     }
1191   }
1192   editor->bCaretAtEnd = FALSE;
1193 }
1194
1195 static void ME_ArrowCtrlHome(ME_TextEditor *editor, ME_Cursor *pCursor)
1196 {
1197   ME_DisplayItem *pRow = ME_FindItemBack(pCursor->pRun, diTextStart);
1198   if (pRow) {
1199     ME_DisplayItem *pRun = ME_FindItemFwd(pRow, diRun);
1200     if (pRun) {
1201       pCursor->pRun = pRun;
1202       pCursor->nOffset = 0;
1203     }
1204   }
1205 }
1206
1207 static void ME_ArrowEnd(ME_TextEditor *editor, ME_Cursor *pCursor)
1208 {
1209   ME_DisplayItem *pRow;
1210
1211   if (editor->bCaretAtEnd && !pCursor->nOffset)
1212     return;
1213
1214   pRow = ME_FindItemFwd(pCursor->pRun, diStartRowOrParagraphOrEnd);
1215   assert(pRow);
1216   if (pRow->type == diStartRow) {
1217     /* FIXME WTF was I thinking about here ? */
1218     ME_DisplayItem *pRun = ME_FindItemFwd(pRow, diRun);
1219     assert(pRun);
1220     pCursor->pRun = pRun;
1221     pCursor->nOffset = 0;
1222     editor->bCaretAtEnd = 1;
1223     return;
1224   }
1225   pCursor->pRun = ME_FindItemBack(pRow, diRun);
1226   assert(pCursor->pRun && pCursor->pRun->member.run.nFlags & MERF_ENDPARA);
1227   pCursor->nOffset = 0;
1228   editor->bCaretAtEnd = FALSE;
1229 }
1230
1231 static void ME_ArrowCtrlEnd(ME_TextEditor *editor, ME_Cursor *pCursor)
1232 {
1233   ME_DisplayItem *p = ME_FindItemFwd(pCursor->pRun, diTextEnd);
1234   assert(p);
1235   p = ME_FindItemBack(p, diRun);
1236   assert(p);
1237   assert(p->member.run.nFlags & MERF_ENDPARA);
1238   pCursor->pRun = p;
1239   pCursor->nOffset = 0;
1240   editor->bCaretAtEnd = FALSE;
1241 }
1242
1243 BOOL ME_IsSelection(ME_TextEditor *editor)
1244 {
1245   return memcmp(&editor->pCursors[0], &editor->pCursors[1], sizeof(ME_Cursor))!=0;
1246 }
1247
1248 static int ME_GetSelCursor(ME_TextEditor *editor, int dir)
1249 {
1250   int cdir = ME_GetCursorOfs(editor, 0) - ME_GetCursorOfs(editor, 1);
1251
1252   if (cdir*dir>0)
1253     return 0;
1254   else
1255     return 1;
1256 }
1257
1258 BOOL ME_UpdateSelection(ME_TextEditor *editor, const ME_Cursor *pTempCursor)
1259 {
1260   ME_Cursor old_anchor = editor->pCursors[1];
1261
1262   if (GetKeyState(VK_SHIFT)>=0) /* cancelling selection */
1263   {
1264     /* any selection was present ? if so, it's no more, repaint ! */
1265     editor->pCursors[1] = editor->pCursors[0];
1266     if (memcmp(pTempCursor, &old_anchor, sizeof(ME_Cursor))) {
1267       return TRUE;
1268     }
1269     return FALSE;
1270   }
1271   else
1272   {
1273     if (!memcmp(pTempCursor, &editor->pCursors[1], sizeof(ME_Cursor))) /* starting selection */
1274     {
1275       editor->pCursors[1] = *pTempCursor;
1276       return TRUE;
1277     }
1278   }
1279
1280   ME_Repaint(editor);
1281   return TRUE;
1282 }
1283
1284 void ME_DeleteSelection(ME_TextEditor *editor)
1285 {
1286   int from, to;
1287   ME_GetSelection(editor, &from, &to);
1288   ME_DeleteTextAtCursor(editor, ME_GetSelCursor(editor,-1), to-from);
1289 }
1290
1291 ME_Style *ME_GetSelectionInsertStyle(ME_TextEditor *editor)
1292 {
1293   return ME_GetInsertStyle(editor, 0);
1294 }
1295
1296 void ME_SendSelChange(ME_TextEditor *editor)
1297 {
1298   SELCHANGE sc;
1299
1300   if (!(editor->nEventMask & ENM_SELCHANGE))
1301     return;
1302
1303   sc.nmhdr.hwndFrom = editor->hWnd;
1304   sc.nmhdr.idFrom = GetWindowLongW(editor->hWnd, GWLP_ID);
1305   sc.nmhdr.code = EN_SELCHANGE;
1306   SendMessageW(editor->hWnd, EM_EXGETSEL, 0, (LPARAM)&sc.chrg);
1307   sc.seltyp = SEL_EMPTY;
1308   if (sc.chrg.cpMin != sc.chrg.cpMax)
1309     sc.seltyp |= SEL_TEXT;
1310   if (sc.chrg.cpMin < sc.chrg.cpMax+1) /* wth were RICHEDIT authors thinking ? */
1311     sc.seltyp |= SEL_MULTICHAR;
1312   TRACE("cpMin=%d cpMax=%d seltyp=%d (%s %s)\n",
1313     sc.chrg.cpMin, sc.chrg.cpMax, sc.seltyp,
1314     (sc.seltyp & SEL_TEXT) ? "SEL_TEXT" : "",
1315     (sc.seltyp & SEL_MULTICHAR) ? "SEL_MULTICHAR" : "");
1316   if (sc.chrg.cpMin != editor->notified_cr.cpMin || sc.chrg.cpMax != editor->notified_cr.cpMax)
1317   {
1318     ME_ClearTempStyle(editor);
1319
1320     editor->notified_cr = sc.chrg;
1321     SendMessageW(GetParent(editor->hWnd), WM_NOTIFY, sc.nmhdr.idFrom, (LPARAM)&sc);
1322   }
1323 }
1324
1325 BOOL
1326 ME_ArrowKey(ME_TextEditor *editor, int nVKey, BOOL extend, BOOL ctrl)
1327 {
1328   int nCursor = 0;
1329   ME_Cursor *p = &editor->pCursors[nCursor];
1330   ME_Cursor tmp_curs = *p;
1331   BOOL success = FALSE;
1332
1333   ME_CheckCharOffsets(editor);
1334   editor->nUDArrowX = -1;
1335   switch(nVKey) {
1336     case VK_LEFT:
1337       editor->bCaretAtEnd = 0;
1338       if (ctrl)
1339         success = ME_MoveCursorWords(editor, &tmp_curs, -1);
1340       else
1341         success = ME_MoveCursorChars(editor, &tmp_curs, -1);
1342       break;
1343     case VK_RIGHT:
1344       editor->bCaretAtEnd = 0;
1345       if (ctrl)
1346         success = ME_MoveCursorWords(editor, &tmp_curs, +1);
1347       else
1348         success = ME_MoveCursorChars(editor, &tmp_curs, +1);
1349       break;
1350     case VK_UP:
1351       ME_MoveCursorLines(editor, &tmp_curs, -1);
1352       break;
1353     case VK_DOWN:
1354       ME_MoveCursorLines(editor, &tmp_curs, +1);
1355       break;
1356     case VK_PRIOR:
1357       ME_ArrowPageUp(editor, &tmp_curs);
1358       break;
1359     case VK_NEXT:
1360       ME_ArrowPageDown(editor, &tmp_curs);
1361       break;
1362     case VK_HOME: {
1363       if (ctrl)
1364         ME_ArrowCtrlHome(editor, &tmp_curs);
1365       else
1366         ME_ArrowHome(editor, &tmp_curs);
1367       editor->bCaretAtEnd = 0;
1368       break;
1369     }
1370     case VK_END:
1371       if (ctrl)
1372         ME_ArrowCtrlEnd(editor, &tmp_curs);
1373       else
1374         ME_ArrowEnd(editor, &tmp_curs);
1375       break;
1376   }
1377
1378   if (!extend)
1379     editor->pCursors[1] = tmp_curs;
1380   *p = tmp_curs;
1381
1382   ME_InvalidateSelection(editor);
1383   ME_Repaint(editor);
1384   HideCaret(editor->hWnd);
1385   ME_EnsureVisible(editor, tmp_curs.pRun);
1386   ME_ShowCaret(editor);
1387   ME_SendSelChange(editor);
1388   return success;
1389 }