reactos/dll/win32/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) && (how->flags & GTL_USECRLF))
  61     length += editor->nParagraphs - 1;
  62
  63   if (how->flags & GTL_NUMBYTES)
  64   {
  65     CPINFO cpinfo;
  66
  67     if (how->codepage == 1200)
  68       return length * 2;
  69     if (how->flags & GTL_PRECISE)
  70       FIXME("GTL_PRECISE flag unsupported. Using GTL_CLOSE\n");
  71     if (GetCPInfo(how->codepage, &cpinfo))
  72       return length * cpinfo.MaxCharSize;
  73     ERR("Invalid codepage %u\n", how->codepage);
  74     return E_INVALIDARG;
  75   }
  76   return length;
  77 }
  78
  79
  80 int ME_SetSelection(ME_TextEditor *editor, int from, int to)
  81 {
  82   int selectionEnd = 0;
  83   const int len = ME_GetTextLength(editor);
  84
  85   /* all negative values are effectively the same */
  86   if (from < 0)
  87     from = -1;
  88   if (to < 0)
  89     to = -1;
  90
  91   /* select all */
  92   if (from == 0 && to == -1)
  93   {
  94     editor->pCursors[1].pRun = ME_FindItemFwd(editor->pBuffer->pFirst, diRun);
  95     editor->pCursors[1].nOffset = 0;
  96     editor->pCursors[0].pRun = ME_FindItemBack(editor->pBuffer->pLast, diRun);
  97     editor->pCursors[0].nOffset = 0;
  98     ME_InvalidateSelection(editor);
  99     ME_ClearTempStyle(editor);
 100     return len + 1;
 101   }
 102
 103   /* if both values are equal and also out of bound, that means to */
 104   /* put the selection at the end of the text */
 105   if ((from == to) && (to < 0 || to > len))
 106   {
 107     selectionEnd = 1;
 108   }
 109   else
 110   {
 111     /* if from is negative and to is positive then selection is */
 112     /* deselected and caret moved to end of the current selection */
 113     if (from < 0)
 114     {
 115       int start, end;
 116       ME_GetSelection(editor, &start, &end);
 117       editor->pCursors[1] = editor->pCursors[0];
 118       ME_Repaint(editor);
 119       ME_ClearTempStyle(editor);
 120       return end;
 121     }
 122
 123     /* adjust to if it's a negative value */
 124     if (to < 0)
 125       to = len + 1;
 126
 127     /* flip from and to if they are reversed */
 128     if (from>to)
 129     {
 130       int tmp = from;
 131       from = to;
 132       to = tmp;
 133     }
 134
 135     /* after fiddling with the values, we find from > len && to > len */
 136     if (from > len)
 137       selectionEnd = 1;
 138     /* special case with to too big */
 139     else if (to > len)
 140       to = len + 1;
 141   }
 142
 143   if (selectionEnd)
 144   {
 145     editor->pCursors[1].pRun = editor->pCursors[0].pRun = ME_FindItemBack(editor->pBuffer->pLast, diRun);
 146     editor->pCursors[1].nOffset = editor->pCursors[0].nOffset = 0;
 147     ME_InvalidateSelection(editor);
 148     ME_ClearTempStyle(editor);
 149     return len;
 150   }
 151
 152   ME_RunOfsFromCharOfs(editor, from, &editor->pCursors[1].pRun, &editor->pCursors[1].nOffset);
 153   ME_RunOfsFromCharOfs(editor, to, &editor->pCursors[0].pRun, &editor->pCursors[0].nOffset);
 154   return to;
 155 }
 156
 157
 158 void
 159 ME_GetCursorCoordinates(ME_TextEditor *editor, ME_Cursor *pCursor,
 160                         int *x, int *y, int *height)
 161 {
 162   ME_DisplayItem *pCursorRun = pCursor->pRun;
 163   ME_DisplayItem *pSizeRun = pCursor->pRun;
 164
 165   assert(!pCursor->nOffset || !editor->bCaretAtEnd);
 166   assert(height && x && y);
 167   assert(!(ME_GetParagraph(pCursorRun)->member.para.nFlags & MEPF_REWRAP));
 168   assert(pCursor->pRun);
 169   assert(pCursor->pRun->type == diRun);
 170
 171   if (pCursorRun->type == diRun) {
 172     ME_DisplayItem *row = ME_FindItemBack(pCursorRun, diStartRowOrParagraph);
 173
 174     if (row) {
 175       HDC hDC = GetDC(editor->hWnd);
 176       ME_Context c;
 177       ME_DisplayItem *run = pCursorRun;
 178       ME_DisplayItem *para = NULL;
 179       SIZE sz = {0, 0};
 180
 181       ME_InitContext(&c, editor, hDC);
 182
 183       if (!pCursor->nOffset && !editor->bCaretAtEnd)
 184       {
 185         ME_DisplayItem *prev = ME_FindItemBack(pCursorRun, diRunOrStartRow);
 186         assert(prev);
 187         if (prev->type == diRun)
 188           pSizeRun = prev;
 189       }
 190       assert(row->type == diStartRow); /* paragraph -> run without start row ?*/
 191       para = ME_FindItemBack(row, diParagraph);
 192       assert(para);
 193       assert(para->type == diParagraph);
 194       if (editor->bCaretAtEnd && !pCursor->nOffset &&
 195           run == ME_FindItemFwd(row, diRun))
 196       {
 197         ME_DisplayItem *tmp = ME_FindItemBack(row, diRunOrParagraph);
 198         assert(tmp);
 199         if (tmp->type == diRun)
 200         {
 201           row = ME_FindItemBack(tmp, diStartRow);
 202           pSizeRun = run = tmp;
 203           assert(run);
 204           assert(run->type == diRun);
 205           sz = ME_GetRunSize(&c, &para->member.para,
 206                              &run->member.run, ME_StrLen(run->member.run.strText),
 207                              row->member.row.nLMargin);
 208         }
 209       }
 210       if (pCursor->nOffset && !(run->member.run.nFlags & MERF_SKIPPED)) {
 211         sz = ME_GetRunSize(&c, &para->member.para, &run->member.run, pCursor->nOffset,
 212                            row->member.row.nLMargin);
 213       }
 214
 215       *height = pSizeRun->member.run.nAscent + pSizeRun->member.run.nDescent;
 216       *x = run->member.run.pt.x + sz.cx;
 217       *y = para->member.para.nYPos + row->member.row.nBaseline + pSizeRun->member.run.pt.y - pSizeRun->member.run.nAscent - ME_GetYScrollPos(editor);
 218
 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       if (!ME_FindItemFwd(c.pRun, diParagraph))
 274       {
 275         return;
 276       }
 277       ME_JoinParagraphs(editor, ME_GetParagraph(c.pRun));
 278       /* ME_SkipAndPropagateCharOffset(p->pRun, shift); */
 279       ME_CheckCharOffsets(editor);
 280       nChars--;
 281       if (editor->bEmulateVersion10 && nChars)
 282         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       if (pos!=str)
 526         ME_InternalInsertTextFromCursor(editor, nCursor, str, pos-str, style, 0);
 527       p = &editor->pCursors[nCursor];
 528       if (p->nOffset) {
 529         ME_SplitRunSimple(editor, p->pRun, p->nOffset);
 530         p = &editor->pCursors[nCursor];
 531       }
 532       tmp_style = ME_GetInsertStyle(editor, nCursor);
 533       /* ME_SplitParagraph increases style refcount */
 534       tp = ME_SplitParagraph(editor, p->pRun, p->pRun->member.run.style);
 535       p->pRun = ME_FindItemFwd(tp, diRun);
 536       end_run = ME_FindItemBack(tp, diRun);
 537       ME_ReleaseStyle(end_run->member.run.style);
 538       end_run->member.run.style = tmp_style;
 539       p->nOffset = 0;
 540       if(pos-str < len && *pos =='\r')
 541         pos++;
 542       if(pos-str < len && *pos =='\n')
 543         pos++;
 544       if(pos-str <= len) {
 545         len -= pos - str;
 546         str = pos;
 547         continue;
 548       }
 549     }
 550     ME_InternalInsertTextFromCursor(editor, nCursor, str, len, style, 0);
 551     len = 0;
 552   }
 553 }
 554
 555
 556 static BOOL
 557 ME_MoveCursorChars(ME_TextEditor *editor, ME_Cursor *pCursor, int nRelOfs)
 558 {
 559   ME_DisplayItem *pRun = pCursor->pRun;
 560
 561   if (nRelOfs == -1)
 562   {
 563     if (!pCursor->nOffset)
 564     {
 565       do {
 566         pRun = ME_FindItemBack(pRun, diRunOrParagraph);
 567         assert(pRun);
 568         switch (pRun->type)
 569         {
 570           case diRun:
 571             break;
 572           case diParagraph:
 573             if (pRun->member.para.prev_para->type == diTextStart)
 574               return FALSE;
 575             pRun = ME_FindItemBack(pRun, diRunOrParagraph);
 576             /* every paragraph ought to have at least one run */
 577             assert(pRun && pRun->type == diRun);
 578             assert(pRun->member.run.nFlags & MERF_ENDPARA);
 579             break;
 580           default:
 581             assert(pRun->type != diRun && pRun->type != diParagraph);
 582             return FALSE;
 583         }
 584       } while (RUN_IS_HIDDEN(&pRun->member.run));
 585       pCursor->pRun = pRun;
 586       if (pRun->member.run.nFlags & MERF_ENDPARA)
 587         pCursor->nOffset = 0;
 588       else
 589         pCursor->nOffset = pRun->member.run.strText->nLen;
 590     }
 591
 592     if (pCursor->nOffset)
 593       pCursor->nOffset = ME_StrRelPos2(pCursor->pRun->member.run.strText, pCursor->nOffset, nRelOfs);
 594     return TRUE;
 595   }
 596   else
 597   {
 598     if (!(pRun->member.run.nFlags & MERF_ENDPARA))
 599     {
 600       int new_ofs = ME_StrRelPos2(pRun->member.run.strText, pCursor->nOffset, nRelOfs);
 601
 602       if (new_ofs < pRun->member.run.strText->nLen)
 603       {
 604         pCursor->nOffset = new_ofs;
 605         return TRUE;
 606       }
 607     }
 608     do {
 609       pRun = ME_FindItemFwd(pRun, diRun);
 610     } while (pRun && RUN_IS_HIDDEN(&pRun->member.run));
 611     if (pRun)
 612     {
 613       pCursor->pRun = pRun;
 614       pCursor->nOffset = 0;
 615       return TRUE;
 616     }
 617   }
 618   return FALSE;
 619 }
 620
 621
 622 static BOOL
 623 ME_MoveCursorWords(ME_TextEditor *editor, ME_Cursor *cursor, int nRelOfs)
 624 {
 625   ME_DisplayItem *pRun = cursor->pRun, *pOtherRun;
 626   int nOffset = cursor->nOffset;
 627
 628   if (nRelOfs == -1)
 629   {
 630     /* Backward movement */
 631     while (TRUE)
 632     {
 633       nOffset = ME_CallWordBreakProc(editor, pRun->member.run.strText,
 634                                      nOffset, WB_MOVEWORDLEFT);
 635        if (nOffset)
 636         break;
 637       pOtherRun = ME_FindItemBack(pRun, diRunOrParagraph);
 638       if (pOtherRun->type == diRun)
 639       {
 640         if (ME_CallWordBreakProc(editor, pOtherRun->member.run.strText,
 641                                  pOtherRun->member.run.strText->nLen - 1,
 642                                  WB_ISDELIMITER)
 643             && !(pRun->member.run.nFlags & MERF_ENDPARA)
 644             && !(cursor->pRun == pRun && cursor->nOffset == 0)
 645             && !ME_CallWordBreakProc(editor, pRun->member.run.strText, 0,
 646                                      WB_ISDELIMITER))
 647           break;
 648         pRun = pOtherRun;
 649         nOffset = pOtherRun->member.run.strText->nLen;
 650       }
 651       else if (pOtherRun->type == diParagraph)
 652       {
 653         if (cursor->pRun == pRun && cursor->nOffset == 0)
 654         {
 655           /* Paragraph breaks are treated as separate words */
 656           if (pOtherRun->member.para.prev_para->type == diTextStart)
 657             return FALSE;
 658           pRun = ME_FindItemBack(pOtherRun, diRunOrParagraph);
 659         }
 660         break;
 661       }
 662     }
 663   }
 664   else
 665   {
 666     /* Forward movement */
 667     BOOL last_delim = FALSE;
 668
 669     while (TRUE)
 670     {
 671       if (last_delim && !ME_CallWordBreakProc(editor, pRun->member.run.strText,
 672                                               nOffset, WB_ISDELIMITER))
 673         break;
 674       nOffset = ME_CallWordBreakProc(editor, pRun->member.run.strText,
 675                                      nOffset, WB_MOVEWORDRIGHT);
 676       if (nOffset < pRun->member.run.strText->nLen)
 677         break;
 678       pOtherRun = ME_FindItemFwd(pRun, diRunOrParagraphOrEnd);
 679       if (pOtherRun->type == diRun)
 680       {
 681         last_delim = ME_CallWordBreakProc(editor, pRun->member.run.strText,
 682                                           nOffset - 1, WB_ISDELIMITER);
 683         pRun = pOtherRun;
 684         nOffset = 0;
 685       }
 686       else if (pOtherRun->type == diParagraph)
 687       {
 688         if (cursor->pRun == pRun)
 689           pRun = ME_FindItemFwd(pOtherRun, diRun);
 690         nOffset = 0;
 691         break;
 692       }
 693       else /* diTextEnd */
 694       {
 695         if (cursor->pRun == pRun)
 696           return FALSE;
 697         nOffset = 0;
 698         break;
 699       }
 700     }
 701   }
 702   cursor->pRun = pRun;
 703   cursor->nOffset = nOffset;
 704   return TRUE;
 705 }
 706
 707
 708 void
 709 ME_SelectWord(ME_TextEditor *editor)
 710 {
 711   if (!(editor->pCursors[0].pRun->member.run.nFlags & MERF_ENDPARA))
 712     ME_MoveCursorWords(editor, &editor->pCursors[0], -1);
 713   ME_MoveCursorWords(editor, &editor->pCursors[1], +1);
 714   ME_InvalidateSelection(editor);
 715   ME_SendSelChange(editor);
 716 }
 717
 718
 719 int ME_GetCursorOfs(ME_TextEditor *editor, int nCursor)
 720 {
 721   ME_Cursor *pCursor = &editor->pCursors[nCursor];
 722   return ME_GetParagraph(pCursor->pRun)->member.para.nCharOfs
 723     + pCursor->pRun->member.run.nCharOfs + pCursor->nOffset;
 724 }
 725
 726 static void ME_FindPixelPos(ME_TextEditor *editor, int x, int y, ME_Cursor *result, BOOL *is_eol)
 727 {
 728   ME_DisplayItem *p = editor->pBuffer->pFirst->member.para.next_para;
 729   ME_DisplayItem *last = NULL;
 730   int rx = 0;
 731
 732   if (is_eol)
 733     *is_eol = 0;
 734
 735   /* find paragraph */
 736   for (; p != editor->pBuffer->pLast; p = p->member.para.next_para)
 737   {
 738     assert(p->type == diParagraph);
 739     if (y < p->member.para.nYPos + p->member.para.nHeight)
 740     {
 741       y -= p->member.para.nYPos;
 742       p = ME_FindItemFwd(p, diStartRow);
 743       break;
 744     }
 745   }
 746   /* find row */
 747   for (; p != editor->pBuffer->pLast; )
 748   {
 749     ME_DisplayItem *pp;
 750     assert(p->type == diStartRow);
 751     if (y < p->member.row.nYPos + p->member.row.nHeight)
 752     {
 753         p = ME_FindItemFwd(p, diRun);
 754         break;
 755     }
 756     pp = ME_FindItemFwd(p, diStartRowOrParagraphOrEnd);
 757     if (pp->type != diStartRow)
 758     {
 759         p = ME_FindItemFwd(p, diRun);
 760         break;
 761     }
 762     p = pp;
 763   }
 764   for (; p != editor->pBuffer->pLast; p = p->next)
 765   {
 766     switch (p->type)
 767     {
 768     case diRun:
 769       rx = x - p->member.run.pt.x;
 770       if (rx < p->member.run.nWidth)
 771       {
 772       found_here:
 773         assert(p->type == diRun);
 774         if ((p->member.run.nFlags & MERF_ENDPARA) || rx < 0)
 775           rx = 0;
 776         result->pRun = p;
 777         result->nOffset = ME_CharFromPointCursor(editor, rx, &p->member.run);
 778         if (editor->pCursors[0].nOffset == p->member.run.strText->nLen && rx)
 779         {
 780           result->pRun = ME_FindItemFwd(editor->pCursors[0].pRun, diRun);
 781           result->nOffset = 0;
 782         }
 783         return;
 784       }
 785       break;
 786     case diStartRow:
 787       p = ME_FindItemFwd(p, diRun);
 788       if (is_eol) *is_eol = 1;
 789       rx = 0; /* FIXME not sure */
 790       goto found_here;
 791     case diParagraph:
 792     case diTextEnd:
 793       rx = 0; /* FIXME not sure */
 794       p = last;
 795       goto found_here;
 796     default: assert(0);
 797     }
 798     last = p;
 799   }
 800   result->pRun = ME_FindItemBack(p, diRun);
 801   result->nOffset = 0;
 802   assert(result->pRun->member.run.nFlags & MERF_ENDPARA);
 803 }
 804
 805
 806 int
 807 ME_CharFromPos(ME_TextEditor *editor, int x, int y)
 808 {
 809   ME_Cursor cursor;
 810   RECT rc;
 811
 812   GetClientRect(editor->hWnd, &rc);
 813   if (x < 0 || y < 0 || x >= rc.right || y >= rc.bottom)
 814     return -1;
 815   y += ME_GetYScrollPos(editor);
 816   ME_FindPixelPos(editor, x, y, &cursor, NULL);
 817   return (ME_GetParagraph(cursor.pRun)->member.para.nCharOfs
 818           + cursor.pRun->member.run.nCharOfs + cursor.nOffset);
 819 }
 820
 821
 822 void ME_LButtonDown(ME_TextEditor *editor, int x, int y)
 823 {
 824   ME_Cursor tmp_cursor;
 825   int is_selection = 0;
 826
 827   editor->nUDArrowX = -1;
 828
 829   y += ME_GetYScrollPos(editor);
 830
 831   tmp_cursor = editor->pCursors[0];
 832   is_selection = ME_IsSelection(editor);
 833
 834   if (x >= editor->selofs)
 835   {
 836     ME_FindPixelPos(editor, x, y, &editor->pCursors[0], &editor->bCaretAtEnd);
 837     if (GetKeyState(VK_SHIFT)>=0)
 838     {
 839       editor->pCursors[1] = editor->pCursors[0];
 840     }
 841     else if (!is_selection) {
 842       editor->pCursors[1] = tmp_cursor;
 843       is_selection = 1;
 844     }
 845
 846     ME_InvalidateSelection(editor);
 847     HideCaret(editor->hWnd);
 848     ME_MoveCaret(editor);
 849     ShowCaret(editor->hWnd);
 850     ME_ClearTempStyle(editor);
 851     ME_SendSelChange(editor);
 852   }
 853   else
 854   {
 855     ME_DisplayItem *pRow;
 856
 857     editor->linesel = 1;
 858     editor->sely = y;
 859     /* Set pCursors[0] to beginning of line */
 860     ME_FindPixelPos(editor, x, y, &editor->pCursors[1], &editor->bCaretAtEnd);
 861     /* Set pCursors[1] to end of line */
 862     pRow = ME_FindItemFwd(editor->pCursors[1].pRun, diStartRowOrParagraphOrEnd);
 863     assert(pRow);
 864     /* pCursor[0] is the position where the cursor will be drawn,
 865      * pCursor[1] is the other end of the selection range
 866      * pCursor[2] and [3] are backups of [0] and [1] so I
 867      * don't have to look them up again
 868      */
 869
 870     if (pRow->type == diStartRow) {
 871       /* FIXME WTF was I thinking about here ? */
 872       ME_DisplayItem *pRun = ME_FindItemFwd(pRow, diRun);
 873       assert(pRun);
 874       editor->pCursors[0].pRun = pRun;
 875       editor->pCursors[0].nOffset = 0;
 876       editor->bCaretAtEnd = 1;
 877     } else {
 878       editor->pCursors[0].pRun = ME_FindItemBack(pRow, diRun);
 879       assert(editor->pCursors[0].pRun && editor->pCursors[0].pRun->member.run.nFlags & MERF_ENDPARA);
 880       editor->pCursors[0].nOffset = 0;
 881       editor->bCaretAtEnd = 0;
 882     }
 883     editor->pCursors[2] = editor->pCursors[0];
 884     editor->pCursors[3] = editor->pCursors[1];
 885     ME_InvalidateSelection(editor);
 886     HideCaret(editor->hWnd);
 887     ME_MoveCaret(editor);
 888     ShowCaret(editor->hWnd);
 889     ME_ClearTempStyle(editor);
 890     ME_SendSelChange(editor);
 891   }
 892 }
 893
 894 void ME_MouseMove(ME_TextEditor *editor, int x, int y)
 895 {
 896   ME_Cursor tmp_cursor;
 897
 898   y += ME_GetYScrollPos(editor);
 899
 900   tmp_cursor = editor->pCursors[0];
 901   /* FIXME: do something with the return value of ME_FindPixelPos */
 902   if (!editor->linesel)
 903     ME_FindPixelPos(editor, x, y, &tmp_cursor, &editor->bCaretAtEnd);
 904   else ME_FindPixelPos(editor, (y > editor->sely) * editor->rcFormat.right, y, &tmp_cursor, &editor->bCaretAtEnd);
 905
 906   if (!memcmp(&tmp_cursor, editor->pCursors, sizeof(tmp_cursor)))
 907     return;
 908
 909   ME_InvalidateSelection(editor);
 910   if (!editor->linesel)
 911     editor->pCursors[0] = tmp_cursor;
 912   else if (!memcmp(&tmp_cursor, editor->pCursors+2, sizeof(tmp_cursor)) ||
 913            !memcmp(&tmp_cursor, editor->pCursors+3, sizeof(tmp_cursor)))
 914   {
 915     editor->pCursors[0] = editor->pCursors[2];
 916     editor->pCursors[1] = editor->pCursors[3];
 917   }
 918   else if (y < editor->sely)
 919   {
 920     editor->pCursors[0] = tmp_cursor;
 921     editor->pCursors[1] = editor->pCursors[2];
 922   }
 923   else
 924   {
 925     editor->pCursors[0] = tmp_cursor;
 926     editor->pCursors[1] = editor->pCursors[3];
 927   }
 928
 929   HideCaret(editor->hWnd);
 930   ME_MoveCaret(editor);
 931   ME_InvalidateSelection(editor);
 932   ShowCaret(editor->hWnd);
 933   ME_SendSelChange(editor);
 934 }
 935
 936 static ME_DisplayItem *ME_FindRunInRow(ME_TextEditor *editor, ME_DisplayItem *pRow,
 937                                 int x, int *pOffset, int *pbCaretAtEnd)
 938 {
 939   ME_DisplayItem *pNext, *pLastRun;
 940   pNext = ME_FindItemFwd(pRow, diRunOrStartRow);
 941   assert(pNext->type == diRun);
 942   pLastRun = pNext;
 943   *pbCaretAtEnd = FALSE;
 944   do {
 945     int run_x = pNext->member.run.pt.x;
 946     int width = pNext->member.run.nWidth;
 947     if (x < run_x)
 948     {
 949       if (pOffset) *pOffset = 0;
 950       return pNext;
 951     }
 952     if (x >= run_x && x < run_x+width)
 953     {
 954       int ch = ME_CharFromPointCursor(editor, x-run_x, &pNext->member.run);
 955       ME_String *s = pNext->member.run.strText;
 956       if (ch < s->nLen) {
 957         if (pOffset)
 958           *pOffset = ch;
 959         return pNext;
 960       }
 961     }
 962     pLastRun = pNext;
 963     pNext = ME_FindItemFwd(pNext, diRunOrStartRow);
 964   } while(pNext && pNext->type == diRun);
 965
 966   if ((pLastRun->member.run.nFlags & MERF_ENDPARA) == 0)
 967   {
 968     pNext = ME_FindItemFwd(pNext, diRun);
 969     if (pbCaretAtEnd) *pbCaretAtEnd = 1;
 970     if (pOffset) *pOffset = 0;
 971     return pNext;
 972   } else {
 973     if (pbCaretAtEnd) *pbCaretAtEnd = 0;
 974     if (pOffset) *pOffset = 0;
 975     return pLastRun;
 976   }
 977 }
 978
 979 static int ME_GetXForArrow(ME_TextEditor *editor, ME_Cursor *pCursor)
 980 {
 981   ME_DisplayItem *pRun = pCursor->pRun;
 982   int x;
 983
 984   if (editor->nUDArrowX != -1)
 985     x = editor->nUDArrowX;
 986   else {
 987     if (editor->bCaretAtEnd)
 988     {
 989       pRun = ME_FindItemBack(pRun, diRun);
 990       assert(pRun);
 991       x = pRun->member.run.pt.x + pRun->member.run.nWidth;
 992     }
 993     else {
 994       x = pRun->member.run.pt.x;
 995       x += ME_PointFromChar(editor, &pRun->member.run, pCursor->nOffset);
 996     }
 997     editor->nUDArrowX = x;
 998   }
 999   return x;
1000 }
1001
1002
1003 static void
1004 ME_MoveCursorLines(ME_TextEditor *editor, ME_Cursor *pCursor, int nRelOfs)
1005 {
1006   ME_DisplayItem *pRun = pCursor->pRun;
1007   ME_DisplayItem *pItem;
1008   int x = ME_GetXForArrow(editor, pCursor);
1009
1010   if (editor->bCaretAtEnd && !pCursor->nOffset)
1011     pRun = ME_FindItemBack(pRun, diRun);
1012   if (!pRun)
1013     return;
1014   if (nRelOfs == -1)
1015   {
1016     /* start of this row */
1017     pItem = ME_FindItemBack(pRun, diStartRow);
1018     assert(pItem);
1019     /* start of the previous row */
1020     pItem = ME_FindItemBack(pItem, diStartRow);
1021   }
1022   else
1023   {
1024     /* start of the next row */
1025     pItem = ME_FindItemFwd(pRun, diStartRow);
1026     /* FIXME If diParagraph is before diStartRow, wrap the next paragraph?
1027     */
1028   }
1029   if (!pItem)
1030   {
1031     /* row not found - ignore */
1032     return;
1033   }
1034   pCursor->pRun = ME_FindRunInRow(editor, pItem, x, &pCursor->nOffset, &editor->bCaretAtEnd);
1035   assert(pCursor->pRun);
1036   assert(pCursor->pRun->type == diRun);
1037 }
1038
1039
1040 static void ME_ArrowPageUp(ME_TextEditor *editor, ME_Cursor *pCursor)
1041 {
1042   ME_DisplayItem *pRun = pCursor->pRun;
1043   ME_DisplayItem *pLast, *p;
1044   int x, y, ys, yd, yp, yprev;
1045   ME_Cursor tmp_curs = *pCursor;
1046
1047   x = ME_GetXForArrow(editor, pCursor);
1048   if (!pCursor->nOffset && editor->bCaretAtEnd)
1049     pRun = ME_FindItemBack(pRun, diRun);
1050
1051   p = ME_FindItemBack(pRun, diStartRowOrParagraph);
1052   assert(p->type == diStartRow);
1053   yp = ME_FindItemBack(p, diParagraph)->member.para.nYPos;
1054   yprev = ys = y = yp + p->member.row.nYPos;
1055   yd = y - editor->sizeWindow.cy;
1056   pLast = p;
1057
1058   do {
1059     p = ME_FindItemBack(p, diStartRowOrParagraph);
1060     if (!p)
1061       break;
1062     if (p->type == diParagraph) { /* crossing paragraphs */
1063       if (p->member.para.prev_para == NULL)
1064         break;
1065       yp = p->member.para.prev_para->member.para.nYPos;
1066       continue;
1067     }
1068     y = yp + p->member.row.nYPos;
1069     if (y < yd)
1070       break;
1071     pLast = p;
1072     yprev = y;
1073   } while(1);
1074
1075   pCursor->pRun = ME_FindRunInRow(editor, pLast, x, &pCursor->nOffset, &editor->bCaretAtEnd);
1076   ME_UpdateSelection(editor, &tmp_curs);
1077   if (yprev < editor->sizeWindow.cy)
1078   {
1079     ME_EnsureVisible(editor, ME_FindItemFwd(editor->pBuffer->pFirst, diRun));
1080     ME_Repaint(editor);
1081   }
1082   else
1083   {
1084     ME_ScrollUp(editor, ys-yprev);
1085   }
1086   assert(pCursor->pRun);
1087   assert(pCursor->pRun->type == diRun);
1088 }
1089
1090 /* FIXME: in the original RICHEDIT, PageDown always scrolls by the same amount
1091    of pixels, even if it makes the scroll bar position exceed its normal maximum.
1092    In such a situation, clicking the scrollbar restores its position back to the
1093    normal range (ie. sets it to (doclength-screenheight)). */
1094
1095 static void ME_ArrowPageDown(ME_TextEditor *editor, ME_Cursor *pCursor)
1096 {
1097   ME_DisplayItem *pRun = pCursor->pRun;
1098   ME_DisplayItem *pLast, *p;
1099   int x, y, ys, yd, yp, yprev;
1100   ME_Cursor tmp_curs = *pCursor;
1101
1102   x = ME_GetXForArrow(editor, pCursor);
1103   if (!pCursor->nOffset && editor->bCaretAtEnd)
1104     pRun = ME_FindItemBack(pRun, diRun);
1105
1106   p = ME_FindItemBack(pRun, diStartRowOrParagraph);
1107   assert(p->type == diStartRow);
1108   yp = ME_FindItemBack(p, diParagraph)->member.para.nYPos;
1109   yprev = ys = y = yp + p->member.row.nYPos;
1110   yd = y + editor->sizeWindow.cy;
1111   pLast = p;
1112
1113   do {
1114     p = ME_FindItemFwd(p, diStartRowOrParagraph);
1115     if (!p)
1116       break;
1117     if (p->type == diParagraph) {
1118       yp = p->member.para.nYPos;
1119       continue;
1120     }
1121     y = yp + p->member.row.nYPos;
1122     if (y >= yd)
1123       break;
1124     pLast = p;
1125     yprev = y;
1126   } while(1);
1127
1128   pCursor->pRun = ME_FindRunInRow(editor, pLast, x, &pCursor->nOffset, &editor->bCaretAtEnd);
1129   ME_UpdateSelection(editor, &tmp_curs);
1130   if (yprev >= editor->nTotalLength-editor->sizeWindow.cy)
1131   {
1132     ME_EnsureVisible(editor, ME_FindItemBack(editor->pBuffer->pLast, diRun));
1133     ME_Repaint(editor);
1134   }
1135   else
1136   {
1137     ME_ScrollUp(editor,ys-yprev);
1138   }
1139   assert(pCursor->pRun);
1140   assert(pCursor->pRun->type == diRun);
1141 }
1142
1143 static void ME_ArrowHome(ME_TextEditor *editor, ME_Cursor *pCursor)
1144 {
1145   ME_DisplayItem *pRow = ME_FindItemBack(pCursor->pRun, diStartRow);
1146   /* bCaretAtEnd doesn't make sense if the cursor isn't set at the
1147   first character of the next row */
1148   assert(!editor->bCaretAtEnd || !pCursor->nOffset);
1149   ME_WrapMarkedParagraphs(editor);
1150   if (pRow) {
1151     ME_DisplayItem *pRun;
1152     if (editor->bCaretAtEnd && !pCursor->nOffset) {
1153       pRow = ME_FindItemBack(pRow, diStartRow);
1154       if (!pRow)
1155         return;
1156     }
1157     pRun = ME_FindItemFwd(pRow, diRun);
1158     if (pRun) {
1159       pCursor->pRun = pRun;
1160       pCursor->nOffset = 0;
1161     }
1162   }
1163   editor->bCaretAtEnd = FALSE;
1164 }
1165
1166 static void ME_ArrowCtrlHome(ME_TextEditor *editor, ME_Cursor *pCursor)
1167 {
1168   ME_DisplayItem *pRow = ME_FindItemBack(pCursor->pRun, diTextStart);
1169   if (pRow) {
1170     ME_DisplayItem *pRun = ME_FindItemFwd(pRow, diRun);
1171     if (pRun) {
1172       pCursor->pRun = pRun;
1173       pCursor->nOffset = 0;
1174     }
1175   }
1176 }
1177
1178 static void ME_ArrowEnd(ME_TextEditor *editor, ME_Cursor *pCursor)
1179 {
1180   ME_DisplayItem *pRow;
1181
1182   if (editor->bCaretAtEnd && !pCursor->nOffset)
1183     return;
1184
1185   pRow = ME_FindItemFwd(pCursor->pRun, diStartRowOrParagraphOrEnd);
1186   assert(pRow);
1187   if (pRow->type == diStartRow) {
1188     /* FIXME WTF was I thinking about here ? */
1189     ME_DisplayItem *pRun = ME_FindItemFwd(pRow, diRun);
1190     assert(pRun);
1191     pCursor->pRun = pRun;
1192     pCursor->nOffset = 0;
1193     editor->bCaretAtEnd = 1;
1194     return;
1195   }
1196   pCursor->pRun = ME_FindItemBack(pRow, diRun);
1197   assert(pCursor->pRun && pCursor->pRun->member.run.nFlags & MERF_ENDPARA);
1198   pCursor->nOffset = 0;
1199   editor->bCaretAtEnd = FALSE;
1200 }
1201
1202 static void ME_ArrowCtrlEnd(ME_TextEditor *editor, ME_Cursor *pCursor)
1203 {
1204   ME_DisplayItem *p = ME_FindItemFwd(pCursor->pRun, diTextEnd);
1205   assert(p);
1206   p = ME_FindItemBack(p, diRun);
1207   assert(p);
1208   assert(p->member.run.nFlags & MERF_ENDPARA);
1209   pCursor->pRun = p;
1210   pCursor->nOffset = 0;
1211   editor->bCaretAtEnd = FALSE;
1212 }
1213
1214 BOOL ME_IsSelection(ME_TextEditor *editor)
1215 {
1216   return memcmp(&editor->pCursors[0], &editor->pCursors[1], sizeof(ME_Cursor))!=0;
1217 }
1218
1219 static int ME_GetSelCursor(ME_TextEditor *editor, int dir)
1220 {
1221   int cdir = ME_GetCursorOfs(editor, 0) - ME_GetCursorOfs(editor, 1);
1222
1223   if (cdir*dir>0)
1224     return 0;
1225   else
1226     return 1;
1227 }
1228
1229 BOOL ME_UpdateSelection(ME_TextEditor *editor, const ME_Cursor *pTempCursor)
1230 {
1231   ME_Cursor old_anchor = editor->pCursors[1];
1232
1233   if (GetKeyState(VK_SHIFT)>=0) /* cancelling selection */
1234   {
1235     /* any selection was present ? if so, it's no more, repaint ! */
1236     editor->pCursors[1] = editor->pCursors[0];
1237     if (memcmp(pTempCursor, &old_anchor, sizeof(ME_Cursor))) {
1238       return TRUE;
1239     }
1240     return FALSE;
1241   }
1242   else
1243   {
1244     if (!memcmp(pTempCursor, &editor->pCursors[1], sizeof(ME_Cursor))) /* starting selection */
1245     {
1246       editor->pCursors[1] = *pTempCursor;
1247       return TRUE;
1248     }
1249   }
1250
1251   ME_Repaint(editor);
1252   return TRUE;
1253 }
1254
1255 void ME_DeleteSelection(ME_TextEditor *editor)
1256 {
1257   int from, to;
1258   ME_GetSelection(editor, &from, &to);
1259   ME_DeleteTextAtCursor(editor, ME_GetSelCursor(editor,-1), to-from);
1260 }
1261
1262 ME_Style *ME_GetSelectionInsertStyle(ME_TextEditor *editor)
1263 {
1264   ME_Style *style;
1265   int from, to;
1266
1267   ME_GetSelection(editor, &from, &to);
1268   if (from != to) {
1269     ME_Cursor c;
1270     ME_CursorFromCharOfs(editor, from, &c);
1271     style = c.pRun->member.run.style;
1272     ME_AddRefStyle(style); /* ME_GetInsertStyle has already done that */
1273   }
1274   else
1275     style = ME_GetInsertStyle(editor, 0);
1276   return style;
1277 }
1278
1279 void ME_SendSelChange(ME_TextEditor *editor)
1280 {
1281   SELCHANGE sc;
1282
1283   ME_ClearTempStyle(editor);
1284
1285   if (!(editor->nEventMask & ENM_SELCHANGE))
1286     return;
1287
1288   sc.nmhdr.hwndFrom = editor->hWnd;
1289   sc.nmhdr.idFrom = GetWindowLongW(editor->hWnd, GWLP_ID);
1290   sc.nmhdr.code = EN_SELCHANGE;
1291   SendMessageW(editor->hWnd, EM_EXGETSEL, 0, (LPARAM)&sc.chrg);
1292   sc.seltyp = SEL_EMPTY;
1293   if (sc.chrg.cpMin != sc.chrg.cpMax)
1294     sc.seltyp |= SEL_TEXT;
1295   if (sc.chrg.cpMin < sc.chrg.cpMax+1) /* wth were RICHEDIT authors thinking ? */
1296     sc.seltyp |= SEL_MULTICHAR;
1297   SendMessageW(GetParent(editor->hWnd), WM_NOTIFY, sc.nmhdr.idFrom, (LPARAM)&sc);
1298 }
1299
1300 BOOL
1301 ME_ArrowKey(ME_TextEditor *editor, int nVKey, BOOL extend, BOOL ctrl)
1302 {
1303   int nCursor = 0;
1304   ME_Cursor *p = &editor->pCursors[nCursor];
1305   ME_Cursor tmp_curs = *p;
1306   BOOL success = FALSE;
1307
1308   ME_CheckCharOffsets(editor);
1309   editor->nUDArrowX = -1;
1310   switch(nVKey) {
1311     case VK_LEFT:
1312       editor->bCaretAtEnd = 0;
1313       if (ctrl)
1314         success = ME_MoveCursorWords(editor, &tmp_curs, -1);
1315       else
1316         success = ME_MoveCursorChars(editor, &tmp_curs, -1);
1317       break;
1318     case VK_RIGHT:
1319       editor->bCaretAtEnd = 0;
1320       if (ctrl)
1321         success = ME_MoveCursorWords(editor, &tmp_curs, +1);
1322       else
1323         success = ME_MoveCursorChars(editor, &tmp_curs, +1);
1324       break;
1325     case VK_UP:
1326       ME_MoveCursorLines(editor, &tmp_curs, -1);
1327       break;
1328     case VK_DOWN:
1329       ME_MoveCursorLines(editor, &tmp_curs, +1);
1330       break;
1331     case VK_PRIOR:
1332       ME_ArrowPageUp(editor, &tmp_curs);
1333       break;
1334     case VK_NEXT:
1335       ME_ArrowPageDown(editor, &tmp_curs);
1336       break;
1337     case VK_HOME: {
1338       if (ctrl)
1339         ME_ArrowCtrlHome(editor, &tmp_curs);
1340       else
1341         ME_ArrowHome(editor, &tmp_curs);
1342       editor->bCaretAtEnd = 0;
1343       break;
1344     }
1345     case VK_END:
1346       if (ctrl)
1347         ME_ArrowCtrlEnd(editor, &tmp_curs);
1348       else
1349         ME_ArrowEnd(editor, &tmp_curs);
1350       break;
1351   }
1352
1353   if (!extend)
1354     editor->pCursors[1] = tmp_curs;
1355   *p = tmp_curs;
1356
1357   ME_InvalidateSelection(editor);
1358   ME_Repaint(editor);
1359   HideCaret(editor->hWnd);
1360   ME_EnsureVisible(editor, tmp_curs.pRun);
1361   ME_ShowCaret(editor);
1362   ME_SendSelChange(editor);
1363   return success;
1364 }