git.oblomov.eu Git - wine/blob - dlls/comctl32/syslink.c

   1 /*
   2  * SysLink control
   3  *
   4  * Copyright 2004 - 2006 Thomas Weidenmueller <w3seek@reactos.com>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  *
  20  * NOTES
  21  *
  22  * This code was audited for completeness against the documented features
  23  * of Comctl32.dll version 6.0 on Apr. 4, 2005, by Dimitrie O. Paun.
  24  *
  25  * Unless otherwise noted, we believe this code to be complete, as per
  26  * the specification mentioned above.
  27  * If you discover missing features, or bugs, please note them below.
  28  */
  29
  30 #include <stdarg.h>
  31 #include <string.h>
  32 #include "windef.h"
  33 #include "winbase.h"
  34 #include "wingdi.h"
  35 #include "winuser.h"
  36 #include "winnls.h"
  37 #include "commctrl.h"
  38 #include "comctl32.h"
  39 #include "wine/unicode.h"
  40 #include "wine/debug.h"
  41
  42 WINE_DEFAULT_DEBUG_CHANNEL(progress);
  43
  44 INT WINAPI StrCmpNIW(LPCWSTR,LPCWSTR,INT);
  45
  46 typedef struct
  47 {
  48     int nChars;
  49     int nSkip;
  50     RECT rc;
  51 } DOC_TEXTBLOCK, *PDOC_TEXTBLOCK;
  52
  53 #define LIF_FLAGSMASK   (LIF_STATE | LIF_ITEMID | LIF_URL)
  54 #define LIS_MASK        (LIS_FOCUSED | LIS_ENABLED | LIS_VISITED)
  55
  56 typedef enum
  57 {
  58     slText = 0,
  59     slLink
  60 } SL_ITEM_TYPE;
  61
  62 typedef struct _DOC_ITEM
  63 {
  64     struct _DOC_ITEM *Next; /* Address to the next item */
  65     UINT nText;             /* Number of characters of the text */
  66     SL_ITEM_TYPE Type;      /* type of the item */
  67     PDOC_TEXTBLOCK Blocks;  /* Array of text blocks */
  68     union
  69     {
  70         struct
  71         {
  72             UINT state;     /* Link state */
  73             WCHAR *szID;    /* Link ID string */
  74             WCHAR *szUrl;   /* Link URL string */
  75         } Link;
  76         struct
  77         {
  78             UINT Dummy;
  79         } Text;
  80     } u;
  81     WCHAR Text[1];          /* Text of the document item */
  82 } DOC_ITEM, *PDOC_ITEM;
  83
  84 typedef struct
  85 {
  86     HWND      Self;         /* The window handle for this control */
  87     HWND      Notify;       /* The parent handle to receive notifications */
  88     DWORD     Style;        /* Styles for this control */
  89     PDOC_ITEM Items;        /* Address to the first document item */
  90     BOOL      HasFocus;     /* Whether the control has the input focus */
  91     int       MouseDownID;  /* ID of the link that the mouse button first selected */
  92     HFONT     Font;         /* Handle to the font for text */
  93     HFONT     LinkFont;     /* Handle to the font for links */
  94     COLORREF  TextColor;    /* Color of the text */
  95     COLORREF  LinkColor;    /* Color of links */
  96     COLORREF  VisitedColor; /* Color of visited links */
  97     WCHAR     BreakChar;    /* Break Character for the current font */
  98 } SYSLINK_INFO;
  99
 100 static const WCHAR SL_LINKOPEN[] =  { '<','a', 0 };
 101 static const WCHAR SL_HREF[] =      { 'h','r','e','f','=','\"',0 };
 102 static const WCHAR SL_ID[] =        { 'i','d','=','\"',0 };
 103 static const WCHAR SL_LINKCLOSE[] = { '<','/','a','>',0 };
 104
 105 /* Control configuration constants */
 106
 107 #define SL_LEFTMARGIN   (0)
 108 #define SL_TOPMARGIN    (0)
 109 #define SL_RIGHTMARGIN  (0)
 110 #define SL_BOTTOMMARGIN (0)
 111
 112 /***********************************************************************
 113  * SYSLINK_FreeDocItem
 114  * Frees all data and gdi objects associated with a document item
 115  */
 116 static VOID SYSLINK_FreeDocItem (PDOC_ITEM DocItem)
 117 {
 118     if(DocItem->Type == slLink)
 119     {
 120         Free(DocItem->u.Link.szID);
 121         Free(DocItem->u.Link.szUrl);
 122     }
 123
 124     /* we don't free Text because it's just a pointer to a character in the
 125        entire window text string */
 126
 127     Free(DocItem);
 128 }
 129
 130 /***********************************************************************
 131  * SYSLINK_AppendDocItem
 132  * Create and append a new document item.
 133  */
 134 static PDOC_ITEM SYSLINK_AppendDocItem (SYSLINK_INFO *infoPtr, LPCWSTR Text, UINT textlen,
 135                                         SL_ITEM_TYPE type, PDOC_ITEM LastItem)
 136 {
 137     PDOC_ITEM Item;
 138
 139     textlen = min(textlen, lstrlenW(Text));
 140     Item = Alloc(FIELD_OFFSET(DOC_ITEM, Text[textlen + 1]));
 141     if(Item == NULL)
 142     {
 143         ERR("Failed to alloc DOC_ITEM structure!\n");
 144         return NULL;
 145     }
 146
 147     Item->Next = NULL;
 148     Item->nText = textlen;
 149     Item->Type = type;
 150     Item->Blocks = NULL;
 151
 152     if(LastItem != NULL)
 153     {
 154         LastItem->Next = Item;
 155     }
 156     else
 157     {
 158         infoPtr->Items = Item;
 159     }
 160
 161     lstrcpynW(Item->Text, Text, textlen + 1);
 162
 163     return Item;
 164 }
 165
 166 /***********************************************************************
 167  * SYSLINK_ClearDoc
 168  * Clears the document tree
 169  */
 170 static VOID SYSLINK_ClearDoc (SYSLINK_INFO *infoPtr)
 171 {
 172     PDOC_ITEM Item, Next;
 173
 174     Item = infoPtr->Items;
 175     while(Item != NULL)
 176     {
 177         Next = Item->Next;
 178         SYSLINK_FreeDocItem(Item);
 179         Item = Next;
 180     }
 181
 182     infoPtr->Items = NULL;
 183 }
 184
 185 /***********************************************************************
 186  * SYSLINK_ParseText
 187  * Parses the window text string and creates a document. Returns the
 188  * number of document items created.
 189  */
 190 static UINT SYSLINK_ParseText (SYSLINK_INFO *infoPtr, LPCWSTR Text)
 191 {
 192     LPCWSTR current, textstart = NULL, linktext = NULL, firsttag = NULL;
 193     int taglen = 0, textlen = 0, linklen = 0, docitems = 0;
 194     PDOC_ITEM Last = NULL;
 195     SL_ITEM_TYPE CurrentType = slText;
 196     LPCWSTR lpID, lpUrl;
 197     UINT lenId, lenUrl;
 198
 199     for(current = Text; *current != 0;)
 200     {
 201         if(*current == '<')
 202         {
 203             if(!StrCmpNIW(current, SL_LINKOPEN, 2) && (CurrentType == slText))
 204             {
 205                 BOOL ValidParam = FALSE, ValidLink = FALSE;
 206
 207                 if(*(current + 2) == '>')
 208                 {
 209                     /* we just have to deal with a <a> tag */
 210                     taglen = 3;
 211                     ValidLink = TRUE;
 212                     ValidParam = TRUE;
 213                     firsttag = current;
 214                     linklen = 0;
 215                     lpID = NULL;
 216                     lpUrl = NULL;
 217                 }
 218                 else if(*(current + 2) == infoPtr->BreakChar)
 219                 {
 220                     /* we expect parameters, parse them */
 221                     LPCWSTR *CurrentParameter = NULL, tmp;
 222                     UINT *CurrentParameterLen = NULL;
 223
 224                     taglen = 3;
 225                     tmp = current + taglen;
 226                     lpID = NULL;
 227                     lpUrl = NULL;
 228
 229 CheckParameter:
 230                     /* compare the current position with all known parameters */
 231                     if(!StrCmpNIW(tmp, SL_HREF, 6))
 232                     {
 233                         taglen += 6;
 234                         ValidParam = TRUE;
 235                         CurrentParameter = &lpUrl;
 236                         CurrentParameterLen = &lenUrl;
 237                     }
 238                     else if(!StrCmpNIW(tmp, SL_ID, 4))
 239                     {
 240                         taglen += 4;
 241                         ValidParam = TRUE;
 242                         CurrentParameter = &lpID;
 243                         CurrentParameterLen = &lenId;
 244                     }
 245                     else
 246                     {
 247                         ValidParam = FALSE;
 248                     }
 249
 250                     if(ValidParam)
 251                     {
 252                         /* we got a known parameter, now search until the next " character.
 253                            If we can't find a " character, there's a syntax error and we just assume it's text */
 254                         ValidParam = FALSE;
 255                         *CurrentParameter = current + taglen;
 256                         *CurrentParameterLen = 0;
 257
 258                         for(tmp = *CurrentParameter; *tmp != 0; tmp++)
 259                         {
 260                             taglen++;
 261                             if(*tmp == '\"')
 262                             {
 263                                 ValidParam = TRUE;
 264                                 tmp++;
 265                                 break;
 266                             }
 267                             (*CurrentParameterLen)++;
 268                         }
 269                     }
 270                     if(ValidParam)
 271                     {
 272                         /* we're done with this parameter, now there are only 2 possibilities:
 273                          * 1. another parameter is coming, so expect a ' ' (space) character
 274                          * 2. the tag is being closed, so expect a '<' character
 275                          */
 276                         if(*tmp == infoPtr->BreakChar)
 277                         {
 278                             /* we expect another parameter, do the whole thing again */
 279                             taglen++;
 280                             tmp++;
 281                             goto CheckParameter;
 282                         }
 283                         else if(*tmp == '>')
 284                         {
 285                             /* the tag is being closed, we're done */
 286                             ValidLink = TRUE;
 287                             taglen++;
 288                         }
 289                         else
 290                             tmp++;
 291                     }
 292                 }
 293
 294                 if(ValidLink && ValidParam)
 295                 {
 296                     /* the <a ...> tag appears to be valid. save all information
 297                        so we can add the link if we find a valid </a> tag later */
 298                     CurrentType = slLink;
 299                     linktext = current + taglen;
 300                     linklen = 0;
 301                     firsttag = current;
 302                 }
 303                 else
 304                 {
 305                     taglen = 1;
 306                     lpID = NULL;
 307                     lpUrl = NULL;
 308                     if(textstart == NULL)
 309                     {
 310                         textstart = current;
 311                     }
 312                 }
 313             }
 314             else if(!StrCmpNIW(current, SL_LINKCLOSE, 4) && (CurrentType == slLink) && firsttag)
 315             {
 316                 /* there's a <a...> tag opened, first add the previous text, if present */
 317                 if(textstart != NULL && textlen > 0 && firsttag > textstart)
 318                 {
 319                     Last = SYSLINK_AppendDocItem(infoPtr, textstart, firsttag - textstart, slText, Last);
 320                     if(Last == NULL)
 321                     {
 322                         ERR("Unable to create new document item!\n");
 323                         return docitems;
 324                     }
 325                     docitems++;
 326                     textstart = NULL;
 327                     textlen = 0;
 328                 }
 329
 330                 /* now it's time to add the link to the document */
 331                 current += 4;
 332                 if(linktext != NULL && linklen > 0)
 333                 {
 334                     Last = SYSLINK_AppendDocItem(infoPtr, linktext, linklen, slLink, Last);
 335                     if(Last == NULL)
 336                     {
 337                         ERR("Unable to create new document item!\n");
 338                         return docitems;
 339                     }
 340                     docitems++;
 341                     if(CurrentType == slLink)
 342                     {
 343                         int nc;
 344
 345                         if(!(infoPtr->Style & WS_DISABLED))
 346                         {
 347                             Last->u.Link.state |= LIS_ENABLED;
 348                         }
 349                         /* Copy the tag parameters */
 350                         if(lpID != NULL)
 351                         {
 352                             nc = min(lenId, strlenW(lpID));
 353                             nc = min(nc, MAX_LINKID_TEXT - 1);
 354                             Last->u.Link.szID = Alloc((nc + 1) * sizeof(WCHAR));
 355                             if(Last->u.Link.szID != NULL)
 356                             {
 357                                 lstrcpynW(Last->u.Link.szID, lpID, nc + 1);
 358                             }
 359                         }
 360                         else
 361                             Last->u.Link.szID = NULL;
 362                         if(lpUrl != NULL)
 363                         {
 364                             nc = min(lenUrl, strlenW(lpUrl));
 365                             nc = min(nc, L_MAX_URL_LENGTH - 1);
 366                             Last->u.Link.szUrl = Alloc((nc + 1) * sizeof(WCHAR));
 367                             if(Last->u.Link.szUrl != NULL)
 368                             {
 369                                 lstrcpynW(Last->u.Link.szUrl, lpUrl, nc + 1);
 370                             }
 371                         }
 372                         else
 373                             Last->u.Link.szUrl = NULL;
 374                     }
 375                     linktext = NULL;
 376                 }
 377                 CurrentType = slText;
 378                 firsttag = NULL;
 379                 textstart = NULL;
 380                 continue;
 381             }
 382             else
 383             {
 384                 /* we don't know what tag it is, so just continue */
 385                 taglen = 1;
 386                 linklen++;
 387                 if(CurrentType == slText && textstart == NULL)
 388                 {
 389                     textstart = current;
 390                 }
 391             }
 392
 393             textlen += taglen;
 394             current += taglen;
 395         }
 396         else
 397         {
 398             textlen++;
 399             linklen++;
 400
 401             /* save the pointer of the current text item if we couldn't find a tag */
 402             if(textstart == NULL && CurrentType == slText)
 403             {
 404                 textstart = current;
 405             }
 406
 407             current++;
 408         }
 409     }
 410
 411     if(textstart != NULL && textlen > 0)
 412     {
 413         Last = SYSLINK_AppendDocItem(infoPtr, textstart, textlen, CurrentType, Last);
 414         if(Last == NULL)
 415         {
 416             ERR("Unable to create new document item!\n");
 417             return docitems;
 418         }
 419         if(CurrentType == slLink)
 420         {
 421             int nc;
 422
 423             if(!(infoPtr->Style & WS_DISABLED))
 424             {
 425                 Last->u.Link.state |= LIS_ENABLED;
 426             }
 427             /* Copy the tag parameters */
 428             if(lpID != NULL)
 429             {
 430                 nc = min(lenId, strlenW(lpID));
 431                 nc = min(nc, MAX_LINKID_TEXT - 1);
 432                 Last->u.Link.szID = Alloc((nc + 1) * sizeof(WCHAR));
 433                 if(Last->u.Link.szID != NULL)
 434                 {
 435                     lstrcpynW(Last->u.Link.szID, lpID, nc + 1);
 436                 }
 437             }
 438             else
 439                 Last->u.Link.szID = NULL;
 440             if(lpUrl != NULL)
 441             {
 442                 nc = min(lenUrl, strlenW(lpUrl));
 443                 nc = min(nc, L_MAX_URL_LENGTH - 1);
 444                 Last->u.Link.szUrl = Alloc((nc + 1) * sizeof(WCHAR));
 445                 if(Last->u.Link.szUrl != NULL)
 446                 {
 447                     lstrcpynW(Last->u.Link.szUrl, lpUrl, nc + 1);
 448                 }
 449             }
 450             else
 451                 Last->u.Link.szUrl = NULL;
 452         }
 453         docitems++;
 454     }
 455
 456     if(linktext != NULL && linklen > 0)
 457     {
 458         /* we got an unclosed link, just display the text */
 459         Last = SYSLINK_AppendDocItem(infoPtr, linktext, linklen, slText, Last);
 460         if(Last == NULL)
 461         {
 462             ERR("Unable to create new document item!\n");
 463             return docitems;
 464         }
 465         docitems++;
 466     }
 467
 468     return docitems;
 469 }
 470
 471 /***********************************************************************
 472  * SYSLINK_RepaintLink
 473  * Repaints a link.
 474  */
 475 static VOID SYSLINK_RepaintLink (SYSLINK_INFO *infoPtr, PDOC_ITEM DocItem)
 476 {
 477     PDOC_TEXTBLOCK bl;
 478     int n;
 479
 480     if(DocItem->Type != slLink)
 481     {
 482         ERR("DocItem not a link!\n");
 483         return;
 484     }
 485
 486     bl = DocItem->Blocks;
 487     if (bl != NULL)
 488     {
 489         n = DocItem->nText;
 490
 491         while(n > 0)
 492         {
 493             InvalidateRect(infoPtr->Self, &bl->rc, TRUE);
 494             n -= bl->nChars + bl->nSkip;
 495             bl++;
 496         }
 497     }
 498 }
 499
 500 /***********************************************************************
 501  * SYSLINK_GetLinkItemByIndex
 502  * Retrieves a document link by its index
 503  */
 504 static PDOC_ITEM SYSLINK_GetLinkItemByIndex (SYSLINK_INFO *infoPtr, int iLink)
 505 {
 506     PDOC_ITEM Current = infoPtr->Items;
 507
 508     while(Current != NULL)
 509     {
 510         if((Current->Type == slLink) && (iLink-- <= 0))
 511         {
 512             return Current;
 513         }
 514         Current = Current->Next;
 515     }
 516     return NULL;
 517 }
 518
 519 /***********************************************************************
 520  * SYSLINK_GetFocusLink
 521  * Retrieves the link that has the LIS_FOCUSED bit
 522  */
 523 static PDOC_ITEM SYSLINK_GetFocusLink (SYSLINK_INFO *infoPtr, int *LinkId)
 524 {
 525     PDOC_ITEM Current = infoPtr->Items;
 526     int id = 0;
 527
 528     while(Current != NULL)
 529     {
 530         if((Current->Type == slLink))
 531         {
 532             if(Current->u.Link.state & LIS_FOCUSED)
 533             {
 534                 if(LinkId != NULL)
 535                     *LinkId = id;
 536                 return Current;
 537             }
 538             id++;
 539         }
 540         Current = Current->Next;
 541     }
 542     return NULL;
 543 }
 544
 545 /***********************************************************************
 546  * SYSLINK_GetNextLink
 547  * Gets the next link
 548  */
 549 static PDOC_ITEM SYSLINK_GetNextLink (SYSLINK_INFO *infoPtr, PDOC_ITEM Current)
 550 {
 551     for(Current = (Current != NULL ? Current->Next : infoPtr->Items);
 552         Current != NULL;
 553         Current = Current->Next)
 554     {
 555         if(Current->Type == slLink)
 556         {
 557             return Current;
 558         }
 559     }
 560     return NULL;
 561 }
 562
 563 /***********************************************************************
 564  * SYSLINK_GetPrevLink
 565  * Gets the previous link
 566  */
 567 static PDOC_ITEM SYSLINK_GetPrevLink (SYSLINK_INFO *infoPtr, PDOC_ITEM Current)
 568 {
 569     if(Current == NULL)
 570     {
 571         /* returns the last link */
 572         PDOC_ITEM Last = NULL;
 573
 574         for(Current = infoPtr->Items; Current != NULL; Current = Current->Next)
 575         {
 576             if(Current->Type == slLink)
 577             {
 578                 Last = Current;
 579             }
 580         }
 581         return Last;
 582     }
 583     else
 584     {
 585         /* returns the previous link */
 586         PDOC_ITEM Cur, Prev = NULL;
 587
 588         for(Cur = infoPtr->Items; Cur != NULL; Cur = Cur->Next)
 589         {
 590             if(Cur == Current)
 591             {
 592                 break;
 593             }
 594             if(Cur->Type == slLink)
 595             {
 596                 Prev = Cur;
 597             }
 598         }
 599         return Prev;
 600     }
 601 }
 602
 603 /***********************************************************************
 604  * SYSLINK_WrapLine
 605  * Tries to wrap a line.
 606  */
 607 static BOOL SYSLINK_WrapLine (HDC hdc, LPWSTR Text, WCHAR BreakChar, int *LineLen,
 608                              int nFit, LPSIZE Extent, int Width)
 609 {
 610     WCHAR *Current;
 611
 612     if(nFit == *LineLen)
 613     {
 614         return FALSE;
 615     }
 616
 617     *LineLen = nFit;
 618
 619     Current = Text + nFit;
 620
 621     /* check if we're in the middle of a word */
 622     if((*Current) != BreakChar)
 623     {
 624         /* search for the beginning of the word */
 625         while(Current > Text && (*(Current - 1)) != BreakChar)
 626         {
 627             Current--;
 628             (*LineLen)--;
 629         }
 630
 631         if((*LineLen) == 0)
 632         {
 633             Extent->cx = 0;
 634             Extent->cy = 0;
 635         }
 636         return TRUE;
 637     }
 638
 639     return TRUE;
 640 }
 641
 642 /***********************************************************************
 643  * SYSLINK_Render
 644  * Renders the document in memory
 645  */
 646 static VOID SYSLINK_Render (SYSLINK_INFO *infoPtr, HDC hdc, PRECT pRect)
 647 {
 648     RECT rc;
 649     PDOC_ITEM Current;
 650     HGDIOBJ hOldFont;
 651     int x, y, LineHeight;
 652     SIZE szDoc;
 653
 654     szDoc.cx = szDoc.cy = 0;
 655
 656     rc = *pRect;
 657     rc.right -= SL_RIGHTMARGIN;
 658     rc.bottom -= SL_BOTTOMMARGIN;
 659
 660     if(rc.right - SL_LEFTMARGIN < 0)
 661         rc.right = MAXLONG;
 662     if (rc.bottom - SL_TOPMARGIN < 0)
 663         rc.bottom = MAXLONG;
 664
 665     hOldFont = SelectObject(hdc, infoPtr->Font);
 666
 667     x = SL_LEFTMARGIN;
 668     y = SL_TOPMARGIN;
 669     LineHeight = 0;
 670
 671     for(Current = infoPtr->Items; Current != NULL; Current = Current->Next)
 672     {
 673         int n, nBlocks;
 674         LPWSTR tx;
 675         PDOC_TEXTBLOCK bl, cbl;
 676         INT nFit;
 677         SIZE szDim;
 678
 679         if(Current->nText == 0)
 680         {
 681             continue;
 682         }
 683
 684         tx = Current->Text;
 685         n = Current->nText;
 686
 687         Free(Current->Blocks);
 688         Current->Blocks = NULL;
 689         bl = NULL;
 690         nBlocks = 0;
 691
 692         if(Current->Type == slText)
 693         {
 694             SelectObject(hdc, infoPtr->Font);
 695         }
 696         else if(Current->Type == slLink)
 697         {
 698             SelectObject(hdc, infoPtr->LinkFont);
 699         }
 700
 701         while(n > 0)
 702         {
 703             int SkipChars = 0;
 704
 705             /* skip break characters unless they're the first of the doc item */
 706             if(tx != Current->Text || x == SL_LEFTMARGIN)
 707             {
 708                 while(n > 0 && (*tx) == infoPtr->BreakChar)
 709                 {
 710                     tx++;
 711                     SkipChars++;
 712                     n--;
 713                 }
 714             }
 715
 716             if((n == 0 && SkipChars != 0) ||
 717                GetTextExtentExPointW(hdc, tx, n, rc.right - x, &nFit, NULL, &szDim))
 718             {
 719                 int LineLen = n;
 720                 BOOL Wrap = FALSE;
 721                 PDOC_TEXTBLOCK nbl;
 722
 723                 if(n != 0)
 724                 {
 725                     Wrap = SYSLINK_WrapLine(hdc, tx, infoPtr->BreakChar, &LineLen, nFit, &szDim, rc.right - x);
 726
 727                     if(LineLen == 0)
 728                     {
 729                         if(x > SL_LEFTMARGIN)
 730                         {
 731                             /* move one line down, the word didn't fit into the line */
 732                             x = SL_LEFTMARGIN;
 733                             y += LineHeight;
 734                             LineHeight = 0;
 735                             continue;
 736                         }
 737                         else
 738                         {
 739                             /* the word starts at the beginning of the line and doesn't
 740                                fit into the line, so break it at the last character that fits */
 741                             LineLen = max(nFit, 1);
 742                         }
 743                     }
 744
 745                     if(LineLen != n)
 746                     {
 747                         if(!GetTextExtentExPointW(hdc, tx, LineLen, rc.right - x, NULL, NULL, &szDim))
 748                         {
 749                             if(bl != NULL)
 750                             {
 751                                 Free(bl);
 752                                 bl = NULL;
 753                                 nBlocks = 0;
 754                             }
 755                             break;
 756                         }
 757                     }
 758                 }
 759
 760                 nbl = ReAlloc(bl, (nBlocks + 1) * sizeof(DOC_TEXTBLOCK));
 761                 if (nbl != NULL)
 762                 {
 763                     bl = nbl;
 764                     nBlocks++;
 765
 766                     cbl = bl + nBlocks - 1;
 767
 768                     cbl->nChars = LineLen;
 769                     cbl->nSkip = SkipChars;
 770                     cbl->rc.left = x;
 771                     cbl->rc.top = y;
 772                     cbl->rc.right = x + szDim.cx;
 773                     cbl->rc.bottom = y + szDim.cy;
 774
 775                     if (cbl->rc.right > szDoc.cx)
 776                         szDoc.cx = cbl->rc.right;
 777                     if (cbl->rc.bottom > szDoc.cy)
 778                         szDoc.cy = cbl->rc.bottom;
 779
 780                     if(LineLen != 0)
 781                     {
 782                         x += szDim.cx;
 783                         LineHeight = max(LineHeight, szDim.cy);
 784
 785                         if(Wrap)
 786                         {
 787                             x = SL_LEFTMARGIN;
 788                             y += LineHeight;
 789                             LineHeight = 0;
 790                         }
 791                     }
 792                 }
 793                 else
 794                 {
 795                     Free(bl);
 796                     bl = NULL;
 797                     nBlocks = 0;
 798
 799                     ERR("Failed to alloc DOC_TEXTBLOCK structure!\n");
 800                     break;
 801                 }
 802                 n -= LineLen;
 803                 tx += LineLen;
 804             }
 805             else
 806             {
 807                 n--;
 808             }
 809         }
 810
 811         if(nBlocks != 0)
 812         {
 813             Current->Blocks = bl;
 814         }
 815     }
 816
 817     SelectObject(hdc, hOldFont);
 818
 819     pRect->right = pRect->left + szDoc.cx;
 820     pRect->bottom = pRect->top + szDoc.cy;
 821 }
 822
 823 /***********************************************************************
 824  * SYSLINK_Draw
 825  * Draws the SysLink control.
 826  */
 827 static LRESULT SYSLINK_Draw (SYSLINK_INFO *infoPtr, HDC hdc)
 828 {
 829     RECT rc;
 830     PDOC_ITEM Current;
 831     HFONT hOldFont;
 832     COLORREF OldTextColor, OldBkColor;
 833
 834     hOldFont = SelectObject(hdc, infoPtr->Font);
 835     OldTextColor = SetTextColor(hdc, infoPtr->TextColor);
 836     OldBkColor = SetBkColor(hdc, GetSysColor(COLOR_BTNFACE));
 837
 838     GetClientRect(infoPtr->Self, &rc);
 839     rc.right -= SL_RIGHTMARGIN + SL_LEFTMARGIN;
 840     rc.bottom -= SL_BOTTOMMARGIN + SL_TOPMARGIN;
 841
 842     if(rc.right < 0 || rc.bottom < 0) return 0;
 843
 844     for(Current = infoPtr->Items; Current != NULL; Current = Current->Next)
 845     {
 846         int n;
 847         LPWSTR tx;
 848         PDOC_TEXTBLOCK bl;
 849
 850         bl = Current->Blocks;
 851         if(bl != NULL)
 852         {
 853             tx = Current->Text;
 854             n = Current->nText;
 855
 856             if(Current->Type == slText)
 857             {
 858                  SelectObject(hdc, infoPtr->Font);
 859                  SetTextColor(hdc, infoPtr->TextColor);
 860             }
 861             else
 862             {
 863                  SelectObject(hdc, infoPtr->LinkFont);
 864                  SetTextColor(hdc, (!(Current->u.Link.state & LIS_VISITED) ? infoPtr->LinkColor : infoPtr->VisitedColor));
 865             }
 866
 867             while(n > 0)
 868             {
 869                 tx += bl->nSkip;
 870                 ExtTextOutW(hdc, bl->rc.left, bl->rc.top, ETO_OPAQUE | ETO_CLIPPED, &bl->rc, tx, bl->nChars, NULL);
 871                 if((Current->Type == slLink) && (Current->u.Link.state & LIS_FOCUSED) && infoPtr->HasFocus)
 872                 {
 873                     COLORREF PrevTextColor;
 874                     PrevTextColor = SetTextColor(hdc, infoPtr->TextColor);
 875                     DrawFocusRect(hdc, &bl->rc);
 876                     SetTextColor(hdc, PrevTextColor);
 877                 }
 878                 tx += bl->nChars;
 879                 n -= bl->nChars + bl->nSkip;
 880                 bl++;
 881             }
 882         }
 883     }
 884
 885     SetBkColor(hdc, OldBkColor);
 886     SetTextColor(hdc, OldTextColor);
 887     SelectObject(hdc, hOldFont);
 888
 889     return 0;
 890 }
 891
 892
 893 /***********************************************************************
 894  * SYSLINK_Paint
 895  * Handles the WM_PAINT message.
 896  */
 897 static LRESULT SYSLINK_Paint (SYSLINK_INFO *infoPtr, HDC hdcParam)
 898 {
 899     HDC hdc;
 900     PAINTSTRUCT ps;
 901
 902     hdc = hdcParam ? hdcParam : BeginPaint (infoPtr->Self, &ps);
 903     if (hdc)
 904     {
 905         SYSLINK_Draw (infoPtr, hdc);
 906         if (!hdcParam) EndPaint (infoPtr->Self, &ps);
 907     }
 908     return 0;
 909 }
 910
 911
 912 /***********************************************************************
 913  *           SYSLINK_SetFont
 914  * Set new Font for the SysLink control.
 915  */
 916 static HFONT SYSLINK_SetFont (SYSLINK_INFO *infoPtr, HFONT hFont, BOOL bRedraw)
 917 {
 918     HDC hdc;
 919     LOGFONTW lf;
 920     TEXTMETRICW tm;
 921     RECT rcClient;
 922     HFONT hOldFont = infoPtr->Font;
 923     infoPtr->Font = hFont;
 924
 925     /* free the underline font */
 926     if(infoPtr->LinkFont != NULL)
 927     {
 928         DeleteObject(infoPtr->LinkFont);
 929         infoPtr->LinkFont = NULL;
 930     }
 931
 932     /* Render text position and word wrapping in memory */
 933     if (GetClientRect(infoPtr->Self, &rcClient))
 934     {
 935         hdc = GetDC(infoPtr->Self);
 936         if(hdc != NULL)
 937         {
 938             /* create a new underline font */
 939             if(GetTextMetricsW(hdc, &tm) &&
 940                GetObjectW(infoPtr->Font, sizeof(LOGFONTW), &lf))
 941             {
 942                 lf.lfUnderline = TRUE;
 943                 infoPtr->LinkFont = CreateFontIndirectW(&lf);
 944                 infoPtr->BreakChar = tm.tmBreakChar;
 945             }
 946             else
 947             {
 948                 ERR("Failed to create link font!\n");
 949             }
 950
 951             SYSLINK_Render(infoPtr, hdc, &rcClient);
 952             ReleaseDC(infoPtr->Self, hdc);
 953         }
 954     }
 955
 956     if(bRedraw)
 957     {
 958         RedrawWindow(infoPtr->Self, NULL, NULL, RDW_INVALIDATE | RDW_UPDATENOW);
 959     }
 960
 961     return hOldFont;
 962 }
 963
 964 /***********************************************************************
 965  *           SYSLINK_SetText
 966  * Set new text for the SysLink control.
 967  */
 968 static LRESULT SYSLINK_SetText (SYSLINK_INFO *infoPtr, LPCWSTR Text)
 969 {
 970     int textlen;
 971
 972     /* clear the document */
 973     SYSLINK_ClearDoc(infoPtr);
 974
 975     if(Text == NULL || (textlen = lstrlenW(Text)) == 0)
 976     {
 977         return TRUE;
 978     }
 979
 980     /* let's parse the string and create a document */
 981     if(SYSLINK_ParseText(infoPtr, Text) > 0)
 982     {
 983         RECT rcClient;
 984
 985         /* Render text position and word wrapping in memory */
 986         if (GetClientRect(infoPtr->Self, &rcClient))
 987         {
 988             HDC hdc = GetDC(infoPtr->Self);
 989             if (hdc != NULL)
 990             {
 991                 SYSLINK_Render(infoPtr, hdc, &rcClient);
 992                 ReleaseDC(infoPtr->Self, hdc);
 993
 994                 InvalidateRect(infoPtr->Self, NULL, TRUE);
 995             }
 996         }
 997     }
 998
 999     return TRUE;
1000 }
1001
1002 /***********************************************************************
1003  *           SYSLINK_SetFocusLink
1004  * Updates the focus status bits and focusses the specified link.
1005  * If no document item is specified, the focus bit will be removed from all links.
1006  * Returns the previous focused item.
1007  */
1008 static PDOC_ITEM SYSLINK_SetFocusLink (SYSLINK_INFO *infoPtr, PDOC_ITEM DocItem)
1009 {
1010     PDOC_ITEM Current, PrevFocus = NULL;
1011
1012     for(Current = infoPtr->Items; Current != NULL; Current = Current->Next)
1013     {
1014         if(Current->Type == slLink)
1015         {
1016             if((PrevFocus == NULL) && (Current->u.Link.state & LIS_FOCUSED))
1017             {
1018                 PrevFocus = Current;
1019             }
1020
1021             if(Current == DocItem)
1022             {
1023                 Current->u.Link.state |= LIS_FOCUSED;
1024             }
1025             else
1026             {
1027                 Current->u.Link.state &= ~LIS_FOCUSED;
1028             }
1029         }
1030     }
1031
1032     return PrevFocus;
1033 }
1034
1035 /***********************************************************************
1036  *           SYSLINK_SetItem
1037  * Sets the states and attributes of a link item.
1038  */
1039 static LRESULT SYSLINK_SetItem (SYSLINK_INFO *infoPtr, PLITEM Item)
1040 {
1041     PDOC_ITEM di;
1042     int nc;
1043     PWSTR szId = NULL;
1044     PWSTR szUrl = NULL;
1045     BOOL Repaint = FALSE;
1046
1047     if(!(Item->mask & LIF_ITEMINDEX) || !(Item->mask & (LIF_FLAGSMASK)))
1048     {
1049         ERR("Invalid Flags!\n");
1050         return FALSE;
1051     }
1052
1053     di = SYSLINK_GetLinkItemByIndex(infoPtr, Item->iLink);
1054     if(di == NULL)
1055     {
1056         ERR("Link %d couldn't be found\n", Item->iLink);
1057         return FALSE;
1058     }
1059
1060     if(Item->mask & LIF_ITEMID)
1061     {
1062         nc = min(lstrlenW(Item->szID), MAX_LINKID_TEXT - 1);
1063         szId = Alloc((nc + 1) * sizeof(WCHAR));
1064         if(szId)
1065         {
1066             lstrcpynW(szId, Item->szID, nc + 1);
1067         }
1068         else
1069         {
1070             ERR("Unable to allocate memory for link id\n");
1071             return FALSE;
1072         }
1073     }
1074
1075     if(Item->mask & LIF_URL)
1076     {
1077         nc = min(lstrlenW(Item->szUrl), L_MAX_URL_LENGTH - 1);
1078         szUrl = Alloc((nc + 1) * sizeof(WCHAR));
1079         if(szUrl)
1080         {
1081             lstrcpynW(szUrl, Item->szUrl, nc + 1);
1082         }
1083         else
1084         {
1085             Free(szId);
1086
1087             ERR("Unable to allocate memory for link url\n");
1088             return FALSE;
1089         }
1090     }
1091
1092     if(Item->mask & LIF_ITEMID)
1093     {
1094         Free(di->u.Link.szID);
1095         di->u.Link.szID = szId;
1096     }
1097
1098     if(Item->mask & LIF_URL)
1099     {
1100         Free(di->u.Link.szUrl);
1101         di->u.Link.szUrl = szUrl;
1102     }
1103
1104     if(Item->mask & LIF_STATE)
1105     {
1106         UINT oldstate = di->u.Link.state;
1107         /* clear the masked bits */
1108         di->u.Link.state &= ~(Item->stateMask & LIS_MASK);
1109         /* copy the bits */
1110         di->u.Link.state |= (Item->state & Item->stateMask) & LIS_MASK;
1111         Repaint = (oldstate != di->u.Link.state);
1112
1113         /* update the focus */
1114         SYSLINK_SetFocusLink(infoPtr, ((di->u.Link.state & LIS_FOCUSED) ? di : NULL));
1115     }
1116
1117     if(Repaint)
1118     {
1119         SYSLINK_RepaintLink(infoPtr, di);
1120     }
1121
1122     return TRUE;
1123 }
1124
1125 /***********************************************************************
1126  *           SYSLINK_GetItem
1127  * Retrieves the states and attributes of a link item.
1128  */
1129 static LRESULT SYSLINK_GetItem (SYSLINK_INFO *infoPtr, PLITEM Item)
1130 {
1131     PDOC_ITEM di;
1132
1133     if(!(Item->mask & LIF_ITEMINDEX) || !(Item->mask & (LIF_FLAGSMASK)))
1134     {
1135         ERR("Invalid Flags!\n");
1136         return FALSE;
1137     }
1138
1139     di = SYSLINK_GetLinkItemByIndex(infoPtr, Item->iLink);
1140     if(di == NULL)
1141     {
1142         ERR("Link %d couldn't be found\n", Item->iLink);
1143         return FALSE;
1144     }
1145
1146     if(Item->mask & LIF_STATE)
1147     {
1148         Item->state = (di->u.Link.state & Item->stateMask);
1149         if(!infoPtr->HasFocus)
1150         {
1151             /* remove the LIS_FOCUSED bit if the control doesn't have focus */
1152             Item->state &= ~LIS_FOCUSED;
1153         }
1154     }
1155
1156     if(Item->mask & LIF_ITEMID)
1157     {
1158         if(di->u.Link.szID)
1159         {
1160             lstrcpyW(Item->szID, di->u.Link.szID);
1161         }
1162         else
1163         {
1164             Item->szID[0] = 0;
1165         }
1166     }
1167
1168     if(Item->mask & LIF_URL)
1169     {
1170         if(di->u.Link.szUrl)
1171         {
1172             lstrcpyW(Item->szUrl, di->u.Link.szUrl);
1173         }
1174         else
1175         {
1176             Item->szUrl[0] = 0;
1177         }
1178     }
1179
1180     return TRUE;
1181 }
1182
1183 /***********************************************************************
1184  *           SYSLINK_PtInDocItem
1185  * Determines if a point is in the region of a document item
1186  */
1187 static BOOL SYSLINK_PtInDocItem (PDOC_ITEM DocItem, POINT pt)
1188 {
1189     PDOC_TEXTBLOCK bl;
1190     int n;
1191
1192     bl = DocItem->Blocks;
1193     if (bl != NULL)
1194     {
1195         n = DocItem->nText;
1196
1197         while(n > 0)
1198         {
1199             if (PtInRect(&bl->rc, pt))
1200             {
1201                 return TRUE;
1202             }
1203             n -= bl->nChars + bl->nSkip;
1204             bl++;
1205         }
1206     }
1207
1208     return FALSE;
1209 }
1210
1211 /***********************************************************************
1212  *           SYSLINK_HitTest
1213  * Determines the link the user clicked on.
1214  */
1215 static LRESULT SYSLINK_HitTest (SYSLINK_INFO *infoPtr, PLHITTESTINFO HitTest)
1216 {
1217     PDOC_ITEM Current;
1218     int id = 0;
1219
1220     for(Current = infoPtr->Items; Current != NULL; Current = Current->Next)
1221     {
1222         if(Current->Type == slLink)
1223         {
1224             if(SYSLINK_PtInDocItem(Current, HitTest->pt))
1225             {
1226                 HitTest->item.mask = 0;
1227                 HitTest->item.iLink = id;
1228                 HitTest->item.state = 0;
1229                 HitTest->item.stateMask = 0;
1230                 if(Current->u.Link.szID)
1231                 {
1232                     lstrcpyW(HitTest->item.szID, Current->u.Link.szID);
1233                 }
1234                 else
1235                 {
1236                     HitTest->item.szID[0] = 0;
1237                 }
1238                 if(Current->u.Link.szUrl)
1239                 {
1240                     lstrcpyW(HitTest->item.szUrl, Current->u.Link.szUrl);
1241                 }
1242                 else
1243                 {
1244                     HitTest->item.szUrl[0] = 0;
1245                 }
1246                 return TRUE;
1247             }
1248             id++;
1249         }
1250     }
1251
1252     return FALSE;
1253 }
1254
1255 /***********************************************************************
1256  *           SYSLINK_GetIdealHeight
1257  * Returns the preferred height of a link at the current control's width.
1258  */
1259 static LRESULT SYSLINK_GetIdealHeight (SYSLINK_INFO *infoPtr)
1260 {
1261     HDC hdc = GetDC(infoPtr->Self);
1262     if(hdc != NULL)
1263     {
1264         LRESULT height;
1265         TEXTMETRICW tm;
1266         HGDIOBJ hOldFont = SelectObject(hdc, infoPtr->Font);
1267
1268         if(GetTextMetricsW(hdc, &tm))
1269         {
1270             height = tm.tmHeight;
1271         }
1272         else
1273         {
1274             height = 0;
1275         }
1276         SelectObject(hdc, hOldFont);
1277         ReleaseDC(infoPtr->Self, hdc);
1278
1279         return height;
1280     }
1281     return 0;
1282 }
1283
1284 /***********************************************************************
1285  *           SYSLINK_SendParentNotify
1286  * Sends a WM_NOTIFY message to the parent window.
1287  */
1288 static LRESULT SYSLINK_SendParentNotify (SYSLINK_INFO *infoPtr, UINT code, PDOC_ITEM Link, int iLink)
1289 {
1290     NMLINK nml;
1291
1292     nml.hdr.hwndFrom = infoPtr->Self;
1293     nml.hdr.idFrom = GetWindowLongPtrW(infoPtr->Self, GWLP_ID);
1294     nml.hdr.code = code;
1295
1296     nml.item.mask = 0;
1297     nml.item.iLink = iLink;
1298     nml.item.state = 0;
1299     nml.item.stateMask = 0;
1300     if(Link->u.Link.szID)
1301     {
1302         lstrcpyW(nml.item.szID, Link->u.Link.szID);
1303     }
1304     else
1305     {
1306         nml.item.szID[0] = 0;
1307     }
1308     if(Link->u.Link.szUrl)
1309     {
1310         lstrcpyW(nml.item.szUrl, Link->u.Link.szUrl);
1311     }
1312     else
1313     {
1314         nml.item.szUrl[0] = 0;
1315     }
1316
1317     return SendMessageW(infoPtr->Notify, WM_NOTIFY, (WPARAM)nml.hdr.idFrom, (LPARAM)&nml);
1318 }
1319
1320 /***********************************************************************
1321  *           SYSLINK_SetFocus
1322  * Handles receiving the input focus.
1323  */
1324 static LRESULT SYSLINK_SetFocus (SYSLINK_INFO *infoPtr, HWND PrevFocusWindow)
1325 {
1326     PDOC_ITEM Focus;
1327
1328     infoPtr->HasFocus = TRUE;
1329
1330     /* We always select the first link, even if we activated the control using
1331        SHIFT+TAB. This is the default behavior */
1332     Focus = SYSLINK_GetNextLink(infoPtr, NULL);
1333     if(Focus != NULL)
1334     {
1335         SYSLINK_SetFocusLink(infoPtr, Focus);
1336     }
1337
1338     SYSLINK_RepaintLink(infoPtr, Focus);
1339
1340     return 0;
1341 }
1342
1343 /***********************************************************************
1344  *           SYSLINK_KillFocus
1345  * Handles losing the input focus.
1346  */
1347 static LRESULT SYSLINK_KillFocus (SYSLINK_INFO *infoPtr, HWND NewFocusWindow)
1348 {
1349     PDOC_ITEM Focus;
1350
1351     infoPtr->HasFocus = FALSE;
1352     Focus = SYSLINK_GetFocusLink(infoPtr, NULL);
1353
1354     if(Focus != NULL)
1355     {
1356         SYSLINK_RepaintLink(infoPtr, Focus);
1357     }
1358
1359     return 0;
1360 }
1361
1362 /***********************************************************************
1363  *           SYSLINK_LinkAtPt
1364  * Returns a link at the specified position
1365  */
1366 static PDOC_ITEM SYSLINK_LinkAtPt (SYSLINK_INFO *infoPtr, POINT *pt, int *LinkId, BOOL MustBeEnabled)
1367 {
1368     PDOC_ITEM Current;
1369     int id = 0;
1370
1371     for(Current = infoPtr->Items; Current != NULL; Current = Current->Next)
1372     {
1373         if((Current->Type == slLink) && SYSLINK_PtInDocItem(Current, *pt) &&
1374            (!MustBeEnabled || (MustBeEnabled && (Current->u.Link.state & LIS_ENABLED))))
1375         {
1376             if(LinkId != NULL)
1377             {
1378                 *LinkId = id;
1379             }
1380             return Current;
1381         }
1382         id++;
1383     }
1384
1385     return NULL;
1386 }
1387
1388 /***********************************************************************
1389  *           SYSLINK_LButtonDown
1390  * Handles mouse clicks
1391  */
1392 static LRESULT SYSLINK_LButtonDown (SYSLINK_INFO *infoPtr, DWORD Buttons, POINT *pt)
1393 {
1394     PDOC_ITEM Current, Old;
1395     int id;
1396
1397     Current = SYSLINK_LinkAtPt(infoPtr, pt, &id, TRUE);
1398     if(Current != NULL)
1399     {
1400       SetFocus(infoPtr->Self);
1401
1402       Old = SYSLINK_SetFocusLink(infoPtr, Current);
1403       if(Old != NULL && Old != Current)
1404       {
1405           SYSLINK_RepaintLink(infoPtr, Old);
1406       }
1407       infoPtr->MouseDownID = id;
1408       SYSLINK_RepaintLink(infoPtr, Current);
1409     }
1410
1411     return 0;
1412 }
1413
1414 /***********************************************************************
1415  *           SYSLINK_LButtonUp
1416  * Handles mouse clicks
1417  */
1418 static LRESULT SYSLINK_LButtonUp (SYSLINK_INFO *infoPtr, DWORD Buttons, POINT *pt)
1419 {
1420     if(infoPtr->MouseDownID > -1)
1421     {
1422         PDOC_ITEM Current;
1423         int id;
1424
1425         Current = SYSLINK_LinkAtPt(infoPtr, pt, &id, TRUE);
1426         if((Current != NULL) && (Current->u.Link.state & LIS_FOCUSED) && (infoPtr->MouseDownID == id))
1427         {
1428             SYSLINK_SendParentNotify(infoPtr, NM_CLICK, Current, id);
1429         }
1430     }
1431
1432     infoPtr->MouseDownID = -1;
1433
1434     return 0;
1435 }
1436
1437 /***********************************************************************
1438  *           SYSLINK_OnEnter
1439  * Handles ENTER key events
1440  */
1441 static BOOL SYSLINK_OnEnter (SYSLINK_INFO *infoPtr)
1442 {
1443     if(infoPtr->HasFocus)
1444     {
1445         PDOC_ITEM Focus;
1446         int id;
1447
1448         Focus = SYSLINK_GetFocusLink(infoPtr, &id);
1449         if(Focus != NULL)
1450         {
1451             SYSLINK_SendParentNotify(infoPtr, NM_RETURN, Focus, id);
1452             return TRUE;
1453         }
1454     }
1455     return FALSE;
1456 }
1457
1458 /***********************************************************************
1459  *           SYSKEY_SelectNextPrevLink
1460  * Changes the currently focused link
1461  */
1462 static BOOL SYSKEY_SelectNextPrevLink (SYSLINK_INFO *infoPtr, BOOL Prev)
1463 {
1464     if(infoPtr->HasFocus)
1465     {
1466         PDOC_ITEM Focus;
1467         int id;
1468
1469         Focus = SYSLINK_GetFocusLink(infoPtr, &id);
1470         if(Focus != NULL)
1471         {
1472             PDOC_ITEM NewFocus, OldFocus;
1473
1474             if(Prev)
1475                 NewFocus = SYSLINK_GetPrevLink(infoPtr, Focus);
1476             else
1477                 NewFocus = SYSLINK_GetNextLink(infoPtr, Focus);
1478
1479             if(NewFocus != NULL)
1480             {
1481                 OldFocus = SYSLINK_SetFocusLink(infoPtr, NewFocus);
1482
1483                 if(OldFocus != NewFocus)
1484                 {
1485                     SYSLINK_RepaintLink(infoPtr, OldFocus);
1486                 }
1487                 SYSLINK_RepaintLink(infoPtr, NewFocus);
1488                 return TRUE;
1489             }
1490         }
1491     }
1492     return FALSE;
1493 }
1494
1495 /***********************************************************************
1496  *           SYSKEY_SelectNextPrevLink
1497  * Determines if there's a next or previous link to decide whether the control
1498  * should capture the tab key message
1499  */
1500 static BOOL SYSLINK_NoNextLink (SYSLINK_INFO *infoPtr, BOOL Prev)
1501 {
1502     PDOC_ITEM Focus, NewFocus;
1503
1504     Focus = SYSLINK_GetFocusLink(infoPtr, NULL);
1505     if(Prev)
1506         NewFocus = SYSLINK_GetPrevLink(infoPtr, Focus);
1507     else
1508         NewFocus = SYSLINK_GetNextLink(infoPtr, Focus);
1509
1510     return NewFocus == NULL;
1511 }
1512
1513 /***********************************************************************
1514  *           SYSLINK_GetIdealSize
1515  * Calculates the ideal size of a link control at a given maximum width.
1516  */
1517 static VOID SYSLINK_GetIdealSize (SYSLINK_INFO *infoPtr, int cxMaxWidth, LPSIZE lpSize)
1518 {
1519     RECT rc;
1520     HDC hdc;
1521
1522     rc.left = rc.top = rc.bottom = 0;
1523     rc.right = cxMaxWidth;
1524
1525     hdc = GetDC(infoPtr->Self);
1526     if (hdc != NULL)
1527     {
1528         HGDIOBJ hOldFont = SelectObject(hdc, infoPtr->Font);
1529
1530         SYSLINK_Render(infoPtr, hdc, &rc);
1531
1532         SelectObject(hdc, hOldFont);
1533         ReleaseDC(infoPtr->Self, hdc);
1534
1535         lpSize->cx = rc.right;
1536         lpSize->cy = rc.bottom;
1537     }
1538 }
1539
1540 /***********************************************************************
1541  *           SysLinkWindowProc
1542  */
1543 static LRESULT WINAPI SysLinkWindowProc(HWND hwnd, UINT message,
1544                                         WPARAM wParam, LPARAM lParam)
1545 {
1546     SYSLINK_INFO *infoPtr;
1547
1548     TRACE("hwnd=%p msg=%04x wparam=%x lParam=%lx\n", hwnd, message, wParam, lParam);
1549
1550     infoPtr = (SYSLINK_INFO *)GetWindowLongPtrW(hwnd, 0);
1551
1552     if (!infoPtr && message != WM_CREATE)
1553         goto HandleDefaultMessage;
1554
1555     switch(message) {
1556     case WM_PRINTCLIENT:
1557     case WM_PAINT:
1558         return SYSLINK_Paint (infoPtr, (HDC)wParam);
1559
1560     case WM_SETCURSOR:
1561     {
1562         LHITTESTINFO ht;
1563         DWORD mp = GetMessagePos();
1564
1565         ht.pt.x = (short)LOWORD(mp);
1566         ht.pt.y = (short)HIWORD(mp);
1567
1568         ScreenToClient(infoPtr->Self, &ht.pt);
1569         if(SYSLINK_HitTest (infoPtr, &ht))
1570         {
1571             SetCursor(LoadCursorW(0, (LPCWSTR)IDC_HAND));
1572             return TRUE;
1573         }
1574         /* let the default window proc handle this message */
1575         goto HandleDefaultMessage;
1576     }
1577
1578     case WM_SIZE:
1579     {
1580         RECT rcClient;
1581         if (GetClientRect(infoPtr->Self, &rcClient))
1582         {
1583             HDC hdc = GetDC(infoPtr->Self);
1584             if(hdc != NULL)
1585             {
1586                 SYSLINK_Render(infoPtr, hdc, &rcClient);
1587                 ReleaseDC(infoPtr->Self, hdc);
1588             }
1589         }
1590         return 0;
1591     }
1592
1593     case WM_GETFONT:
1594         return (LRESULT)infoPtr->Font;
1595
1596     case WM_SETFONT:
1597         return (LRESULT)SYSLINK_SetFont(infoPtr, (HFONT)wParam, (BOOL)lParam);
1598
1599     case WM_SETTEXT:
1600         SYSLINK_SetText(infoPtr, (LPWSTR)lParam);
1601         goto HandleDefaultMessage;
1602
1603     case WM_LBUTTONDOWN:
1604     {
1605         POINT pt;
1606         pt.x = (short)LOWORD(lParam);
1607         pt.y = (short)HIWORD(lParam);
1608         return SYSLINK_LButtonDown(infoPtr, wParam, &pt);
1609     }
1610     case WM_LBUTTONUP:
1611     {
1612         POINT pt;
1613         pt.x = (short)LOWORD(lParam);
1614         pt.y = (short)HIWORD(lParam);
1615         return SYSLINK_LButtonUp(infoPtr, wParam, &pt);
1616     }
1617
1618     case WM_KEYDOWN:
1619     {
1620         switch(wParam)
1621         {
1622         case VK_RETURN:
1623             SYSLINK_OnEnter(infoPtr);
1624             return 0;
1625         case VK_TAB:
1626         {
1627             BOOL shift = GetKeyState(VK_SHIFT) & 0x8000;
1628             SYSKEY_SelectNextPrevLink(infoPtr, shift);
1629             return 0;
1630         }
1631         }
1632         goto HandleDefaultMessage;
1633     }
1634
1635     case WM_GETDLGCODE:
1636     {
1637         LRESULT Ret = DLGC_HASSETSEL;
1638         int vk = (lParam != 0 ? (int)((LPMSG)lParam)->wParam : 0);
1639         switch(vk)
1640         {
1641         case VK_RETURN:
1642             Ret |= DLGC_WANTMESSAGE;
1643             break;
1644         case VK_TAB:
1645         {
1646             BOOL shift = GetKeyState(VK_SHIFT) & 0x8000;
1647             if(!SYSLINK_NoNextLink(infoPtr, shift))
1648             {
1649                 Ret |= DLGC_WANTTAB;
1650             }
1651             else
1652             {
1653                 Ret |= DLGC_WANTCHARS;
1654             }
1655             break;
1656         }
1657         }
1658         return Ret;
1659     }
1660
1661     case WM_NCHITTEST:
1662     {
1663         POINT pt;
1664         RECT rc;
1665         pt.x = (short)LOWORD(lParam);
1666         pt.y = (short)HIWORD(lParam);
1667
1668         GetClientRect(infoPtr->Self, &rc);
1669         ScreenToClient(infoPtr->Self, &pt);
1670         if(pt.x < 0 || pt.y < 0 || pt.x > rc.right || pt.y > rc.bottom)
1671         {
1672             return HTNOWHERE;
1673         }
1674
1675         if(SYSLINK_LinkAtPt(infoPtr, &pt, NULL, FALSE))
1676         {
1677             return HTCLIENT;
1678         }
1679
1680         return HTTRANSPARENT;
1681     }
1682
1683     case LM_HITTEST:
1684         return SYSLINK_HitTest(infoPtr, (PLHITTESTINFO)lParam);
1685
1686     case LM_SETITEM:
1687         return SYSLINK_SetItem(infoPtr, (PLITEM)lParam);
1688
1689     case LM_GETITEM:
1690         return SYSLINK_GetItem(infoPtr, (PLITEM)lParam);
1691
1692     case LM_GETIDEALHEIGHT:
1693         if (lParam)
1694         {
1695             /* LM_GETIDEALSIZE */
1696             SYSLINK_GetIdealSize(infoPtr, (int)wParam, (LPSIZE)lParam);
1697         }
1698         return SYSLINK_GetIdealHeight(infoPtr);
1699
1700     case WM_SETFOCUS:
1701         return SYSLINK_SetFocus(infoPtr, (HWND)wParam);
1702
1703     case WM_KILLFOCUS:
1704         return SYSLINK_KillFocus(infoPtr, (HWND)wParam);
1705
1706     case WM_ENABLE:
1707         infoPtr->Style &= ~WS_DISABLED;
1708         infoPtr->Style |= (wParam ? 0 : WS_DISABLED);
1709         InvalidateRect (infoPtr->Self, NULL, FALSE);
1710         return 0;
1711
1712     case WM_STYLECHANGED:
1713         if (wParam == GWL_STYLE)
1714         {
1715             infoPtr->Style = ((LPSTYLESTRUCT)lParam)->styleNew;
1716
1717             InvalidateRect(infoPtr->Self, NULL, TRUE);
1718         }
1719         return 0;
1720
1721     case WM_CREATE:
1722         /* allocate memory for info struct */
1723         infoPtr = Alloc (sizeof(SYSLINK_INFO));
1724         if (!infoPtr) return -1;
1725         SetWindowLongPtrW (hwnd, 0, (DWORD_PTR)infoPtr);
1726
1727         /* initialize the info struct */
1728         infoPtr->Self = hwnd;
1729         infoPtr->Notify = ((LPCREATESTRUCTW)lParam)->hwndParent;
1730         infoPtr->Style = ((LPCREATESTRUCTW)lParam)->style;
1731         infoPtr->Font = 0;
1732         infoPtr->LinkFont = 0;
1733         infoPtr->Items = NULL;
1734         infoPtr->HasFocus = FALSE;
1735         infoPtr->MouseDownID = -1;
1736         infoPtr->TextColor = GetSysColor(COLOR_WINDOWTEXT);
1737         infoPtr->LinkColor = GetSysColor(COLOR_HIGHLIGHT);
1738         infoPtr->VisitedColor = GetSysColor(COLOR_HIGHLIGHT);
1739         infoPtr->BreakChar = ' ';
1740         TRACE("SysLink Ctrl creation, hwnd=%p\n", hwnd);
1741         SYSLINK_SetText(infoPtr, ((LPCREATESTRUCTW)lParam)->lpszName);
1742         return 0;
1743
1744     case WM_DESTROY:
1745         TRACE("SysLink Ctrl destruction, hwnd=%p\n", hwnd);
1746         SYSLINK_ClearDoc(infoPtr);
1747         if(infoPtr->Font != 0) DeleteObject(infoPtr->Font);
1748         if(infoPtr->LinkFont != 0) DeleteObject(infoPtr->LinkFont);
1749         SetWindowLongPtrW(hwnd, 0, 0);
1750         Free (infoPtr);
1751         return 0;
1752
1753     default:
1754 HandleDefaultMessage:
1755         if ((message >= WM_USER) && (message < WM_APP))
1756         {
1757             ERR("unknown msg %04x wp=%04x lp=%08lx\n", message, wParam, lParam );
1758         }
1759         return DefWindowProcW(hwnd, message, wParam, lParam);
1760     }
1761 }
1762
1763
1764 /***********************************************************************
1765  * SYSLINK_Register [Internal]
1766  *
1767  * Registers the SysLink window class.
1768  */
1769 VOID SYSLINK_Register (void)
1770 {
1771     WNDCLASSW wndClass;
1772
1773     ZeroMemory (&wndClass, sizeof(wndClass));
1774     wndClass.style         = CS_GLOBALCLASS | CS_VREDRAW | CS_HREDRAW;
1775     wndClass.lpfnWndProc   = SysLinkWindowProc;
1776     wndClass.cbClsExtra    = 0;
1777     wndClass.cbWndExtra    = sizeof (SYSLINK_INFO *);
1778     wndClass.hCursor       = LoadCursorW (0, (LPWSTR)IDC_ARROW);
1779     wndClass.lpszClassName = WC_LINK;
1780
1781     RegisterClassW (&wndClass);
1782 }
1783
1784
1785 /***********************************************************************
1786  * SYSLINK_Unregister [Internal]
1787  *
1788  * Unregisters the SysLink window class.
1789  */
1790 VOID SYSLINK_Unregister (void)
1791 {
1792     UnregisterClassW (WC_LINK, NULL);
1793 }