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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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         if (DocItem->u.Link.szID != NULL)
 121         {
 122             Free(DocItem->u.Link.szID);
 123         }
 124         if (DocItem->u.Link.szUrl != NULL)
 125         {
 126             Free(DocItem->u.Link.szUrl);
 127         }
 128     }
 129
 130     /* we don't free Text because it's just a pointer to a character in the
 131        entire window text string */
 132
 133     Free(DocItem);
 134 }
 135
 136 /***********************************************************************
 137  * SYSLINK_AppendDocItem
 138  * Create and append a new document item.
 139  */
 140 static PDOC_ITEM SYSLINK_AppendDocItem (SYSLINK_INFO *infoPtr, LPCWSTR Text, UINT textlen,
 141                                         SL_ITEM_TYPE type, PDOC_ITEM LastItem)
 142 {
 143     PDOC_ITEM Item;
 144
 145     textlen = min(textlen, lstrlenW(Text));
 146     Item = Alloc(FIELD_OFFSET(DOC_ITEM, Text[textlen + 1]));
 147     if(Item == NULL)
 148     {
 149         ERR("Failed to alloc DOC_ITEM structure!\n");
 150         return NULL;
 151     }
 152
 153     Item->Next = NULL;
 154     Item->nText = textlen;
 155     Item->Type = type;
 156     Item->Blocks = NULL;
 157
 158     if(LastItem != NULL)
 159     {
 160         LastItem->Next = Item;
 161     }
 162     else
 163     {
 164         infoPtr->Items = Item;
 165     }
 166
 167     lstrcpynW(Item->Text, Text, textlen + 1);
 168
 169     return Item;
 170 }
 171
 172 /***********************************************************************
 173  * SYSLINK_ClearDoc
 174  * Clears the document tree
 175  */
 176 static VOID SYSLINK_ClearDoc (SYSLINK_INFO *infoPtr)
 177 {
 178     PDOC_ITEM Item, Next;
 179
 180     Item = infoPtr->Items;
 181     while(Item != NULL)
 182     {
 183         Next = Item->Next;
 184         SYSLINK_FreeDocItem(Item);
 185         Item = Next;
 186     }
 187
 188     infoPtr->Items = NULL;
 189 }
 190
 191 /***********************************************************************
 192  * SYSLINK_ParseText
 193  * Parses the window text string and creates a document. Returns the
 194  * number of document items created.
 195  */
 196 static UINT SYSLINK_ParseText (SYSLINK_INFO *infoPtr, LPCWSTR Text)
 197 {
 198     LPCWSTR current, textstart = NULL, linktext = NULL, firsttag = NULL;
 199     int taglen = 0, textlen = 0, linklen = 0, docitems = 0;
 200     PDOC_ITEM Last = NULL;
 201     SL_ITEM_TYPE CurrentType = slText;
 202     LPCWSTR lpID, lpUrl;
 203     UINT lenId, lenUrl;
 204
 205     for(current = Text; *current != 0;)
 206     {
 207         if(*current == '<')
 208         {
 209             if(!StrCmpNIW(current, SL_LINKOPEN, 2) && (CurrentType == slText))
 210             {
 211                 BOOL ValidParam = FALSE, ValidLink = FALSE;
 212
 213                 if(*(current + 2) == '>')
 214                 {
 215                     /* we just have to deal with a <a> tag */
 216                     taglen = 3;
 217                     ValidLink = TRUE;
 218                     ValidParam = TRUE;
 219                     firsttag = current;
 220                     linklen = 0;
 221                     lpID = NULL;
 222                     lpUrl = NULL;
 223                 }
 224                 else if(*(current + 2) == infoPtr->BreakChar)
 225                 {
 226                     /* we expect parameters, parse them */
 227                     LPCWSTR *CurrentParameter = NULL, tmp;
 228                     UINT *CurrentParameterLen = NULL;
 229
 230                     taglen = 3;
 231                     tmp = current + taglen;
 232                     lpID = NULL;
 233                     lpUrl = NULL;
 234
 235 CheckParameter:
 236                     /* compare the current position with all known parameters */
 237                     if(!StrCmpNIW(tmp, SL_HREF, 6))
 238                     {
 239                         taglen += 6;
 240                         ValidParam = TRUE;
 241                         CurrentParameter = &lpUrl;
 242                         CurrentParameterLen = &lenUrl;
 243                     }
 244                     else if(!StrCmpNIW(tmp, SL_ID, 4))
 245                     {
 246                         taglen += 4;
 247                         ValidParam = TRUE;
 248                         CurrentParameter = &lpID;
 249                         CurrentParameterLen = &lenId;
 250                     }
 251                     else
 252                     {
 253                         ValidParam = FALSE;
 254                     }
 255
 256                     if(ValidParam)
 257                     {
 258                         /* we got a known parameter, now search until the next " character.
 259                            If we can't find a " character, there's a syntax error and we just assume it's text */
 260                         ValidParam = FALSE;
 261                         *CurrentParameter = current + taglen;
 262                         *CurrentParameterLen = 0;
 263
 264                         for(tmp = *CurrentParameter; *tmp != 0; tmp++)
 265                         {
 266                             taglen++;
 267                             if(*tmp == '\"')
 268                             {
 269                                 ValidParam = TRUE;
 270                                 tmp++;
 271                                 break;
 272                             }
 273                             (*CurrentParameterLen)++;
 274                         }
 275                     }
 276                     if(ValidParam)
 277                     {
 278                         /* we're done with this parameter, now there are only 2 possibilities:
 279                          * 1. another parameter is coming, so expect a ' ' (space) character
 280                          * 2. the tag is being closed, so expect a '<' character
 281                          */
 282                         if(*tmp == infoPtr->BreakChar)
 283                         {
 284                             /* we expect another parameter, do the whole thing again */
 285                             taglen++;
 286                             tmp++;
 287                             goto CheckParameter;
 288                         }
 289                         else if(*tmp == '>')
 290                         {
 291                             /* the tag is being closed, we're done */
 292                             ValidLink = TRUE;
 293                             taglen++;
 294                         }
 295                         else
 296                             tmp++;
 297                     }
 298                 }
 299
 300                 if(ValidLink && ValidParam)
 301                 {
 302                     /* the <a ...> tag appears to be valid. save all information
 303                        so we can add the link if we find a valid </a> tag later */
 304                     CurrentType = slLink;
 305                     linktext = current + taglen;
 306                     linklen = 0;
 307                     firsttag = current;
 308                 }
 309                 else
 310                 {
 311                     taglen = 1;
 312                     lpID = NULL;
 313                     lpUrl = NULL;
 314                     if(textstart == NULL)
 315                     {
 316                         textstart = current;
 317                     }
 318                 }
 319             }
 320             else if(!StrCmpNIW(current, SL_LINKCLOSE, 4) && (CurrentType == slLink) && firsttag)
 321             {
 322                 /* there's a <a...> tag opened, first add the previous text, if present */
 323                 if(textstart != NULL && textlen > 0 && firsttag > textstart)
 324                 {
 325                     Last = SYSLINK_AppendDocItem(infoPtr, textstart, firsttag - textstart, slText, Last);
 326                     if(Last == NULL)
 327                     {
 328                         ERR("Unable to create new document item!\n");
 329                         return docitems;
 330                     }
 331                     docitems++;
 332                     textstart = NULL;
 333                     textlen = 0;
 334                 }
 335
 336                 /* now it's time to add the link to the document */
 337                 current += 4;
 338                 if(linktext != NULL && linklen > 0)
 339                 {
 340                     Last = SYSLINK_AppendDocItem(infoPtr, linktext, linklen, slLink, Last);
 341                     if(Last == NULL)
 342                     {
 343                         ERR("Unable to create new document item!\n");
 344                         return docitems;
 345                     }
 346                     docitems++;
 347                     if(CurrentType == slLink)
 348                     {
 349                         int nc;
 350
 351                         if(!(infoPtr->Style & WS_DISABLED))
 352                         {
 353                             Last->u.Link.state |= LIS_ENABLED;
 354                         }
 355                         /* Copy the tag parameters */
 356                         if(lpID != NULL)
 357                         {
 358                             nc = min(lenId, strlenW(lpID));
 359                             nc = min(nc, MAX_LINKID_TEXT - 1);
 360                             Last->u.Link.szID = Alloc((nc + 1) * sizeof(WCHAR));
 361                             if(Last->u.Link.szID != NULL)
 362                             {
 363                                 lstrcpynW(Last->u.Link.szID, lpID, nc + 1);
 364                             }
 365                         }
 366                         else
 367                             Last->u.Link.szID = NULL;
 368                         if(lpUrl != NULL)
 369                         {
 370                             nc = min(lenUrl, strlenW(lpUrl));
 371                             nc = min(nc, L_MAX_URL_LENGTH - 1);
 372                             Last->u.Link.szUrl = Alloc((nc + 1) * sizeof(WCHAR));
 373                             if(Last->u.Link.szUrl != NULL)
 374                             {
 375                                 lstrcpynW(Last->u.Link.szUrl, lpUrl, nc + 1);
 376                             }
 377                         }
 378                         else
 379                             Last->u.Link.szUrl = NULL;
 380                     }
 381                     linktext = NULL;
 382                 }
 383                 CurrentType = slText;
 384                 firsttag = NULL;
 385                 textstart = NULL;
 386                 continue;
 387             }
 388             else
 389             {
 390                 /* we don't know what tag it is, so just continue */
 391                 taglen = 1;
 392                 linklen++;
 393                 if(CurrentType == slText && textstart == NULL)
 394                 {
 395                     textstart = current;
 396                 }
 397             }
 398
 399             textlen += taglen;
 400             current += taglen;
 401         }
 402         else
 403         {
 404             textlen++;
 405             linklen++;
 406
 407             /* save the pointer of the current text item if we couldn't find a tag */
 408             if(textstart == NULL && CurrentType == slText)
 409             {
 410                 textstart = current;
 411             }
 412
 413             current++;
 414         }
 415     }
 416
 417     if(textstart != NULL && textlen > 0)
 418     {
 419         Last = SYSLINK_AppendDocItem(infoPtr, textstart, textlen, CurrentType, Last);
 420         if(Last == NULL)
 421         {
 422             ERR("Unable to create new document item!\n");
 423             return docitems;
 424         }
 425         if(CurrentType == slLink)
 426         {
 427             int nc;
 428
 429             if(!(infoPtr->Style & WS_DISABLED))
 430             {
 431                 Last->u.Link.state |= LIS_ENABLED;
 432             }
 433             /* Copy the tag parameters */
 434             if(lpID != NULL)
 435             {
 436                 nc = min(lenId, strlenW(lpID));
 437                 nc = min(nc, MAX_LINKID_TEXT - 1);
 438                 Last->u.Link.szID = Alloc((nc + 1) * sizeof(WCHAR));
 439                 if(Last->u.Link.szID != NULL)
 440                 {
 441                     lstrcpynW(Last->u.Link.szID, lpID, nc + 1);
 442                 }
 443             }
 444             else
 445                 Last->u.Link.szID = NULL;
 446             if(lpUrl != NULL)
 447             {
 448                 nc = min(lenUrl, strlenW(lpUrl));
 449                 nc = min(nc, L_MAX_URL_LENGTH - 1);
 450                 Last->u.Link.szUrl = Alloc((nc + 1) * sizeof(WCHAR));
 451                 if(Last->u.Link.szUrl != NULL)
 452                 {
 453                     lstrcpynW(Last->u.Link.szUrl, lpUrl, nc + 1);
 454                 }
 455             }
 456             else
 457                 Last->u.Link.szUrl = NULL;
 458         }
 459         docitems++;
 460     }
 461
 462     if(linktext != NULL && linklen > 0)
 463     {
 464         /* we got an unclosed link, just display the text */
 465         Last = SYSLINK_AppendDocItem(infoPtr, linktext, linklen, slText, Last);
 466         if(Last == NULL)
 467         {
 468             ERR("Unable to create new document item!\n");
 469             return docitems;
 470         }
 471         docitems++;
 472     }
 473
 474     return docitems;
 475 }
 476
 477 /***********************************************************************
 478  * SYSLINK_RepaintLink
 479  * Repaints a link.
 480  */
 481 static VOID SYSLINK_RepaintLink (SYSLINK_INFO *infoPtr, PDOC_ITEM DocItem)
 482 {
 483     PDOC_TEXTBLOCK bl;
 484     int n;
 485
 486     if(DocItem->Type != slLink)
 487     {
 488         ERR("DocItem not a link!\n");
 489         return;
 490     }
 491
 492     bl = DocItem->Blocks;
 493     if (bl != NULL)
 494     {
 495         n = DocItem->nText;
 496
 497         while(n > 0)
 498         {
 499             InvalidateRect(infoPtr->Self, &bl->rc, TRUE);
 500             n -= bl->nChars + bl->nSkip;
 501             bl++;
 502         }
 503     }
 504 }
 505
 506 /***********************************************************************
 507  * SYSLINK_GetLinkItemByIndex
 508  * Retrieves a document link by its index
 509  */
 510 static PDOC_ITEM SYSLINK_GetLinkItemByIndex (SYSLINK_INFO *infoPtr, int iLink)
 511 {
 512     PDOC_ITEM Current = infoPtr->Items;
 513
 514     while(Current != NULL)
 515     {
 516         if((Current->Type == slLink) && (iLink-- <= 0))
 517         {
 518             return Current;
 519         }
 520         Current = Current->Next;
 521     }
 522     return NULL;
 523 }
 524
 525 /***********************************************************************
 526  * SYSLINK_GetFocusLink
 527  * Retrieves the link that has the LIS_FOCUSED bit
 528  */
 529 static PDOC_ITEM SYSLINK_GetFocusLink (SYSLINK_INFO *infoPtr, int *LinkId)
 530 {
 531     PDOC_ITEM Current = infoPtr->Items;
 532     int id = 0;
 533
 534     while(Current != NULL)
 535     {
 536         if((Current->Type == slLink))
 537         {
 538             if(Current->u.Link.state & LIS_FOCUSED)
 539             {
 540                 if(LinkId != NULL)
 541                     *LinkId = id;
 542                 return Current;
 543             }
 544             id++;
 545         }
 546         Current = Current->Next;
 547     }
 548     return NULL;
 549 }
 550
 551 /***********************************************************************
 552  * SYSLINK_GetNextLink
 553  * Gets the next link
 554  */
 555 static PDOC_ITEM SYSLINK_GetNextLink (SYSLINK_INFO *infoPtr, PDOC_ITEM Current)
 556 {
 557     for(Current = (Current != NULL ? Current->Next : infoPtr->Items);
 558         Current != NULL;
 559         Current = Current->Next)
 560     {
 561         if(Current->Type == slLink)
 562         {
 563             return Current;
 564         }
 565     }
 566     return NULL;
 567 }
 568
 569 /***********************************************************************
 570  * SYSLINK_GetPrevLink
 571  * Gets the previous link
 572  */
 573 static PDOC_ITEM SYSLINK_GetPrevLink (SYSLINK_INFO *infoPtr, PDOC_ITEM Current)
 574 {
 575     if(Current == NULL)
 576     {
 577         /* returns the last link */
 578         PDOC_ITEM Last = NULL;
 579
 580         for(Current = infoPtr->Items; Current != NULL; Current = Current->Next)
 581         {
 582             if(Current->Type == slLink)
 583             {
 584                 Last = Current;
 585             }
 586         }
 587         return Last;
 588     }
 589     else
 590     {
 591         /* returns the previous link */
 592         PDOC_ITEM Cur, Prev = NULL;
 593
 594         for(Cur = infoPtr->Items; Cur != NULL; Cur = Cur->Next)
 595         {
 596             if(Cur == Current)
 597             {
 598                 break;
 599             }
 600             if(Cur->Type == slLink)
 601             {
 602                 Prev = Cur;
 603             }
 604         }
 605         return Prev;
 606     }
 607 }
 608
 609 /***********************************************************************
 610  * SYSLINK_WrapLine
 611  * Tries to wrap a line.
 612  */
 613 static BOOL SYSLINK_WrapLine (HDC hdc, LPWSTR Text, WCHAR BreakChar, int *LineLen,
 614                              int nFit, LPSIZE Extent, int Width)
 615 {
 616     WCHAR *Current;
 617
 618     if(nFit == *LineLen)
 619     {
 620         return FALSE;
 621     }
 622
 623     *LineLen = nFit;
 624
 625     Current = Text + nFit;
 626
 627     /* check if we're in the middle of a word */
 628     if((*Current) != BreakChar)
 629     {
 630         /* search for the beginning of the word */
 631         while(Current > Text && (*(Current - 1)) != BreakChar)
 632         {
 633             Current--;
 634             (*LineLen)--;
 635         }
 636
 637         if((*LineLen) == 0)
 638         {
 639             Extent->cx = 0;
 640             Extent->cy = 0;
 641         }
 642         return TRUE;
 643     }
 644
 645     return TRUE;
 646 }
 647
 648 /***********************************************************************
 649  * SYSLINK_Render
 650  * Renders the document in memory
 651  */
 652 static VOID SYSLINK_Render (SYSLINK_INFO *infoPtr, HDC hdc)
 653 {
 654     RECT rc;
 655     PDOC_ITEM Current;
 656     HGDIOBJ hOldFont;
 657     int x, y, LineHeight;
 658
 659     GetClientRect(infoPtr->Self, &rc);
 660     rc.right -= SL_RIGHTMARGIN;
 661     rc.bottom -= SL_BOTTOMMARGIN;
 662
 663     if(rc.right - SL_LEFTMARGIN < 0 || rc.bottom - SL_TOPMARGIN < 0) return;
 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         if (Current->Blocks != NULL)
 688         {
 689             Free(Current->Blocks);
 690             Current->Blocks = NULL;
 691         }
 692         bl = NULL;
 693         nBlocks = 0;
 694
 695         if(Current->Type == slText)
 696         {
 697             SelectObject(hdc, infoPtr->Font);
 698         }
 699         else if(Current->Type == slLink)
 700         {
 701             SelectObject(hdc, infoPtr->LinkFont);
 702         }
 703
 704         while(n > 0)
 705         {
 706             int SkipChars = 0;
 707
 708             /* skip break characters unless they're the first of the doc item */
 709             if(tx != Current->Text || x == SL_LEFTMARGIN)
 710             {
 711                 while(n > 0 && (*tx) == infoPtr->BreakChar)
 712                 {
 713                     tx++;
 714                     SkipChars++;
 715                     n--;
 716                 }
 717             }
 718
 719             if((n == 0 && SkipChars != 0) ||
 720                GetTextExtentExPointW(hdc, tx, n, rc.right - x, &nFit, NULL, &szDim))
 721             {
 722                 int LineLen = n;
 723                 BOOL Wrap = FALSE;
 724
 725                 if(n != 0)
 726                 {
 727                     Wrap = SYSLINK_WrapLine(hdc, tx, infoPtr->BreakChar, &LineLen, nFit, &szDim, rc.right - x);
 728
 729                     if(LineLen == 0)
 730                     {
 731                         if(x > SL_LEFTMARGIN)
 732                         {
 733                             /* move one line down, the word didn't fit into the line */
 734                             x = SL_LEFTMARGIN;
 735                             y += LineHeight;
 736                             LineHeight = 0;
 737                             continue;
 738                         }
 739                         else
 740                         {
 741                             /* the word starts at the beginning of the line and doesn't
 742                                fit into the line, so break it at the last character that fits */
 743                             LineLen = max(nFit, 1);
 744                         }
 745                     }
 746
 747                     if(LineLen != n)
 748                     {
 749                         if(!GetTextExtentExPointW(hdc, tx, LineLen, rc.right - x, NULL, NULL, &szDim))
 750                         {
 751                             if(bl != NULL)
 752                             {
 753                                 Free(bl);
 754                                 bl = NULL;
 755                                 nBlocks = 0;
 756                             }
 757                             break;
 758                         }
 759                     }
 760                 }
 761
 762                 if(bl != NULL)
 763                 {
 764                     PDOC_TEXTBLOCK nbl = ReAlloc(bl, (nBlocks + 1) * sizeof(DOC_TEXTBLOCK));
 765                     if (nbl != NULL)
 766                     {
 767                         bl = nbl;
 768                         nBlocks++;
 769                     }
 770                     else
 771                     {
 772                         Free(bl);
 773                         bl = NULL;
 774                         nBlocks = 0;
 775                     }
 776                 }
 777                 else
 778                 {
 779                     bl = Alloc(sizeof(DOC_TEXTBLOCK));
 780                     if (bl != NULL)
 781                         nBlocks++;
 782                 }
 783
 784                 if(bl != NULL)
 785                 {
 786                     cbl = bl + nBlocks - 1;
 787
 788                     cbl->nChars = LineLen;
 789                     cbl->nSkip = SkipChars;
 790                     cbl->rc.left = x;
 791                     cbl->rc.top = y;
 792                     cbl->rc.right = x + szDim.cx;
 793                     cbl->rc.bottom = y + szDim.cy;
 794
 795                     if(LineLen != 0)
 796                     {
 797                         x += szDim.cx;
 798                         LineHeight = max(LineHeight, szDim.cy);
 799
 800                         if(Wrap)
 801                         {
 802                             x = SL_LEFTMARGIN;
 803                             y += LineHeight;
 804                             LineHeight = 0;
 805                         }
 806                     }
 807                 }
 808                 else
 809                 {
 810                     ERR("Failed to alloc DOC_TEXTBLOCK structure!\n");
 811                     break;
 812                 }
 813                 n -= LineLen;
 814                 tx += LineLen;
 815             }
 816             else
 817             {
 818                 n--;
 819             }
 820         }
 821
 822         if(nBlocks != 0)
 823         {
 824             Current->Blocks = bl;
 825         }
 826     }
 827
 828     SelectObject(hdc, hOldFont);
 829 }
 830
 831 /***********************************************************************
 832  * SYSLINK_Draw
 833  * Draws the SysLink control.
 834  */
 835 static LRESULT SYSLINK_Draw (SYSLINK_INFO *infoPtr, HDC hdc)
 836 {
 837     RECT rc;
 838     PDOC_ITEM Current;
 839     HFONT hOldFont;
 840     COLORREF OldTextColor, OldBkColor;
 841
 842     hOldFont = SelectObject(hdc, infoPtr->Font);
 843     OldTextColor = SetTextColor(hdc, infoPtr->TextColor);
 844     OldBkColor = SetBkColor(hdc, GetSysColor(COLOR_BTNFACE));
 845
 846     GetClientRect(infoPtr->Self, &rc);
 847     rc.right -= SL_RIGHTMARGIN + SL_LEFTMARGIN;
 848     rc.bottom -= SL_BOTTOMMARGIN + SL_TOPMARGIN;
 849
 850     if(rc.right < 0 || rc.bottom < 0) return 0;
 851
 852     for(Current = infoPtr->Items; Current != NULL; Current = Current->Next)
 853     {
 854         int n;
 855         LPWSTR tx;
 856         PDOC_TEXTBLOCK bl;
 857
 858         bl = Current->Blocks;
 859         if(bl != NULL)
 860         {
 861             tx = Current->Text;
 862             n = Current->nText;
 863
 864             if(Current->Type == slText)
 865             {
 866                  SelectObject(hdc, infoPtr->Font);
 867                  SetTextColor(hdc, infoPtr->TextColor);
 868             }
 869             else
 870             {
 871                  SelectObject(hdc, infoPtr->LinkFont);
 872                  SetTextColor(hdc, (!(Current->u.Link.state & LIS_VISITED) ? infoPtr->LinkColor : infoPtr->VisitedColor));
 873             }
 874
 875             while(n > 0)
 876             {
 877                 tx += bl->nSkip;
 878                 ExtTextOutW(hdc, bl->rc.left, bl->rc.top, ETO_OPAQUE | ETO_CLIPPED, &bl->rc, tx, bl->nChars, NULL);
 879                 if((Current->Type == slLink) && (Current->u.Link.state & LIS_FOCUSED) && infoPtr->HasFocus)
 880                 {
 881                     COLORREF PrevTextColor;
 882                     PrevTextColor = SetTextColor(hdc, infoPtr->TextColor);
 883                     DrawFocusRect(hdc, &bl->rc);
 884                     SetTextColor(hdc, PrevTextColor);
 885                 }
 886                 tx += bl->nChars;
 887                 n -= bl->nChars + bl->nSkip;
 888                 bl++;
 889             }
 890         }
 891     }
 892
 893     SetBkColor(hdc, OldBkColor);
 894     SetTextColor(hdc, OldTextColor);
 895     SelectObject(hdc, hOldFont);
 896
 897     return 0;
 898 }
 899
 900
 901 /***********************************************************************
 902  * SYSLINK_Paint
 903  * Handles the WM_PAINT message.
 904  */
 905 static LRESULT SYSLINK_Paint (SYSLINK_INFO *infoPtr, HDC hdcParam)
 906 {
 907     HDC hdc;
 908     PAINTSTRUCT ps;
 909
 910     hdc = hdcParam ? hdcParam : BeginPaint (infoPtr->Self, &ps);
 911     if (hdc)
 912     {
 913         SYSLINK_Draw (infoPtr, hdc);
 914         if (!hdcParam) EndPaint (infoPtr->Self, &ps);
 915     }
 916     return 0;
 917 }
 918
 919
 920 /***********************************************************************
 921  *           SYSLINK_SetFont
 922  * Set new Font for the SysLink control.
 923  */
 924 static HFONT SYSLINK_SetFont (SYSLINK_INFO *infoPtr, HFONT hFont, BOOL bRedraw)
 925 {
 926     HDC hdc;
 927     LOGFONTW lf;
 928     TEXTMETRICW tm;
 929     HFONT hOldFont = infoPtr->Font;
 930     infoPtr->Font = hFont;
 931
 932     /* free the underline font */
 933     if(infoPtr->LinkFont != NULL)
 934     {
 935         DeleteObject(infoPtr->LinkFont);
 936         infoPtr->LinkFont = NULL;
 937     }
 938
 939     /* Render text position and word wrapping in memory */
 940     hdc = GetDC(infoPtr->Self);
 941     if(hdc != NULL)
 942     {
 943         /* create a new underline font */
 944         if(GetTextMetricsW(hdc, &tm) &&
 945            GetObjectW(infoPtr->Font, sizeof(LOGFONTW), &lf))
 946         {
 947             lf.lfUnderline = TRUE;
 948             infoPtr->LinkFont = CreateFontIndirectW(&lf);
 949             infoPtr->BreakChar = tm.tmBreakChar;
 950         }
 951         else
 952         {
 953             ERR("Failed to create link font!\n");
 954         }
 955
 956         SYSLINK_Render(infoPtr, hdc);
 957         ReleaseDC(infoPtr->Self, hdc);
 958     }
 959
 960     if(bRedraw)
 961     {
 962         RedrawWindow(infoPtr->Self, NULL, NULL, RDW_INVALIDATE | RDW_UPDATENOW);
 963     }
 964
 965     return hOldFont;
 966 }
 967
 968 /***********************************************************************
 969  *           SYSLINK_SetText
 970  * Set new text for the SysLink control.
 971  */
 972 static LRESULT SYSLINK_SetText (SYSLINK_INFO *infoPtr, LPCWSTR Text)
 973 {
 974     int textlen;
 975
 976     /* clear the document */
 977     SYSLINK_ClearDoc(infoPtr);
 978
 979     if(Text == NULL || (textlen = lstrlenW(Text)) == 0)
 980     {
 981         return TRUE;
 982     }
 983
 984     /* let's parse the string and create a document */
 985     if(SYSLINK_ParseText(infoPtr, Text) > 0)
 986     {
 987         /* Render text position and word wrapping in memory */
 988         HDC hdc = GetDC(infoPtr->Self);
 989         if (hdc != NULL)
 990         {
 991             SYSLINK_Render(infoPtr, hdc);
 992             ReleaseDC(infoPtr->Self, hdc);
 993
 994             InvalidateRect(infoPtr->Self, NULL, TRUE);
 995         }
 996     }
 997
 998     return TRUE;
 999 }
1000
1001 /***********************************************************************
1002  *           SYSLINK_SetFocusLink
1003  * Updates the focus status bits and focusses the specified link.
1004  * If no document item is specified, the focus bit will be removed from all links.
1005  * Returns the previous focused item.
1006  */
1007 static PDOC_ITEM SYSLINK_SetFocusLink (SYSLINK_INFO *infoPtr, PDOC_ITEM DocItem)
1008 {
1009     PDOC_ITEM Current, PrevFocus = NULL;
1010
1011     for(Current = infoPtr->Items; Current != NULL; Current = Current->Next)
1012     {
1013         if(Current->Type == slLink)
1014         {
1015             if((PrevFocus == NULL) && (Current->u.Link.state & LIS_FOCUSED))
1016             {
1017                 PrevFocus = Current;
1018             }
1019
1020             if(Current == DocItem)
1021             {
1022                 Current->u.Link.state |= LIS_FOCUSED;
1023             }
1024             else
1025             {
1026                 Current->u.Link.state &= ~LIS_FOCUSED;
1027             }
1028         }
1029     }
1030
1031     return PrevFocus;
1032 }
1033
1034 /***********************************************************************
1035  *           SYSLINK_SetItem
1036  * Sets the states and attributes of a link item.
1037  */
1038 static LRESULT SYSLINK_SetItem (SYSLINK_INFO *infoPtr, PLITEM Item)
1039 {
1040     PDOC_ITEM di;
1041     int nc;
1042     PWSTR szId = NULL;
1043     PWSTR szUrl = NULL;
1044     BOOL Repaint = FALSE;
1045
1046     if(!(Item->mask & LIF_ITEMINDEX) || !(Item->mask & (LIF_FLAGSMASK)))
1047     {
1048         ERR("Invalid Flags!\n");
1049         return FALSE;
1050     }
1051
1052     di = SYSLINK_GetLinkItemByIndex(infoPtr, Item->iLink);
1053     if(di == NULL)
1054     {
1055         ERR("Link %d couldn't be found\n", Item->iLink);
1056         return FALSE;
1057     }
1058
1059     if(Item->mask & LIF_ITEMID)
1060     {
1061         nc = min(lstrlenW(Item->szID), MAX_LINKID_TEXT - 1);
1062         szId = Alloc((nc + 1) * sizeof(WCHAR));
1063         if(szId)
1064         {
1065             lstrcpynW(szId, Item->szID, nc + 1);
1066         }
1067         else
1068         {
1069             ERR("Unable to allocate memory for link id\n");
1070             return FALSE;
1071         }
1072     }
1073
1074     if(Item->mask & LIF_URL)
1075     {
1076         nc = min(lstrlenW(Item->szUrl), L_MAX_URL_LENGTH - 1);
1077         szUrl = Alloc((nc + 1) * sizeof(WCHAR));
1078         if(szUrl)
1079         {
1080             lstrcpynW(szUrl, Item->szUrl, nc + 1);
1081         }
1082         else
1083         {
1084             if (szId)
1085             {
1086                 Free(szId);
1087             }
1088
1089             ERR("Unable to allocate memory for link url\n");
1090             return FALSE;
1091         }
1092     }
1093
1094     if(Item->mask & LIF_ITEMID)
1095     {
1096         if(di->u.Link.szID)
1097         {
1098             Free(di->u.Link.szID);
1099         }
1100         di->u.Link.szID = szId;
1101     }
1102
1103     if(Item->mask & LIF_URL)
1104     {
1105         if(di->u.Link.szUrl)
1106         {
1107             Free(di->u.Link.szUrl);
1108         }
1109         di->u.Link.szUrl = szUrl;
1110     }
1111
1112     if(Item->mask & LIF_STATE)
1113     {
1114         UINT oldstate = di->u.Link.state;
1115         /* clear the masked bits */
1116         di->u.Link.state &= ~(Item->stateMask & LIS_MASK);
1117         /* copy the bits */
1118         di->u.Link.state |= (Item->state & Item->stateMask) & LIS_MASK;
1119         Repaint = (oldstate != di->u.Link.state);
1120
1121         /* update the focus */
1122         SYSLINK_SetFocusLink(infoPtr, ((di->u.Link.state & LIS_FOCUSED) ? di : NULL));
1123     }
1124
1125     if(Repaint)
1126     {
1127         SYSLINK_RepaintLink(infoPtr, di);
1128     }
1129
1130     return TRUE;
1131 }
1132
1133 /***********************************************************************
1134  *           SYSLINK_GetItem
1135  * Retrieves the states and attributes of a link item.
1136  */
1137 static LRESULT SYSLINK_GetItem (SYSLINK_INFO *infoPtr, PLITEM Item)
1138 {
1139     PDOC_ITEM di;
1140
1141     if(!(Item->mask & LIF_ITEMINDEX) || !(Item->mask & (LIF_FLAGSMASK)))
1142     {
1143         ERR("Invalid Flags!\n");
1144         return FALSE;
1145     }
1146
1147     di = SYSLINK_GetLinkItemByIndex(infoPtr, Item->iLink);
1148     if(di == NULL)
1149     {
1150         ERR("Link %d couldn't be found\n", Item->iLink);
1151         return FALSE;
1152     }
1153
1154     if(Item->mask & LIF_STATE)
1155     {
1156         Item->state = (di->u.Link.state & Item->stateMask);
1157         if(!infoPtr->HasFocus)
1158         {
1159             /* remove the LIS_FOCUSED bit if the control doesn't have focus */
1160             Item->state &= ~LIS_FOCUSED;
1161         }
1162     }
1163
1164     if(Item->mask & LIF_ITEMID)
1165     {
1166         if(di->u.Link.szID)
1167         {
1168             lstrcpyW(Item->szID, di->u.Link.szID);
1169         }
1170         else
1171         {
1172             Item->szID[0] = 0;
1173         }
1174     }
1175
1176     if(Item->mask & LIF_URL)
1177     {
1178         if(di->u.Link.szUrl)
1179         {
1180             lstrcpyW(Item->szUrl, di->u.Link.szUrl);
1181         }
1182         else
1183         {
1184             Item->szUrl[0] = 0;
1185         }
1186     }
1187
1188     return TRUE;
1189 }
1190
1191 /***********************************************************************
1192  *           SYSLINK_PtInDocItem
1193  * Determines if a point is in the region of a document item
1194  */
1195 static BOOL SYSLINK_PtInDocItem (PDOC_ITEM DocItem, POINT pt)
1196 {
1197     PDOC_TEXTBLOCK bl;
1198     int n;
1199
1200     bl = DocItem->Blocks;
1201     if (bl != NULL)
1202     {
1203         n = DocItem->nText;
1204
1205         while(n > 0)
1206         {
1207             if (PtInRect(&bl->rc, pt))
1208             {
1209                 return TRUE;
1210             }
1211             n -= bl->nChars + bl->nSkip;
1212             bl++;
1213         }
1214     }
1215
1216     return FALSE;
1217 }
1218
1219 /***********************************************************************
1220  *           SYSLINK_HitTest
1221  * Determines the link the user clicked on.
1222  */
1223 static LRESULT SYSLINK_HitTest (SYSLINK_INFO *infoPtr, PLHITTESTINFO HitTest)
1224 {
1225     PDOC_ITEM Current;
1226     int id = 0;
1227
1228     for(Current = infoPtr->Items; Current != NULL; Current = Current->Next)
1229     {
1230         if(Current->Type == slLink)
1231         {
1232             if(SYSLINK_PtInDocItem(Current, HitTest->pt))
1233             {
1234                 HitTest->item.mask = 0;
1235                 HitTest->item.iLink = id;
1236                 HitTest->item.state = 0;
1237                 HitTest->item.stateMask = 0;
1238                 if(Current->u.Link.szID)
1239                 {
1240                     lstrcpyW(HitTest->item.szID, Current->u.Link.szID);
1241                 }
1242                 else
1243                 {
1244                     HitTest->item.szID[0] = 0;
1245                 }
1246                 if(Current->u.Link.szUrl)
1247                 {
1248                     lstrcpyW(HitTest->item.szUrl, Current->u.Link.szUrl);
1249                 }
1250                 else
1251                 {
1252                     HitTest->item.szUrl[0] = 0;
1253                 }
1254                 return TRUE;
1255             }
1256             id++;
1257         }
1258     }
1259
1260     return FALSE;
1261 }
1262
1263 /***********************************************************************
1264  *           SYSLINK_GetIdealHeight
1265  * Returns the preferred height of a link at the current control's width.
1266  */
1267 static LRESULT SYSLINK_GetIdealHeight (SYSLINK_INFO *infoPtr)
1268 {
1269     HDC hdc = GetDC(infoPtr->Self);
1270     if(hdc != NULL)
1271     {
1272         LRESULT height;
1273         TEXTMETRICW tm;
1274         HGDIOBJ hOldFont = SelectObject(hdc, infoPtr->Font);
1275
1276         if(GetTextMetricsW(hdc, &tm))
1277         {
1278             height = tm.tmHeight;
1279         }
1280         else
1281         {
1282             height = 0;
1283         }
1284         SelectObject(hdc, hOldFont);
1285         ReleaseDC(infoPtr->Self, hdc);
1286
1287         return height;
1288     }
1289     return 0;
1290 }
1291
1292 /***********************************************************************
1293  *           SYSLINK_SendParentNotify
1294  * Sends a WM_NOTIFY message to the parent window.
1295  */
1296 static LRESULT SYSLINK_SendParentNotify (SYSLINK_INFO *infoPtr, UINT code, PDOC_ITEM Link, int iLink)
1297 {
1298     NMLINK nml;
1299
1300     nml.hdr.hwndFrom = infoPtr->Self;
1301     nml.hdr.idFrom = GetWindowLongPtrW(infoPtr->Self, GWLP_ID);
1302     nml.hdr.code = code;
1303
1304     nml.item.mask = 0;
1305     nml.item.iLink = iLink;
1306     nml.item.state = 0;
1307     nml.item.stateMask = 0;
1308     if(Link->u.Link.szID)
1309     {
1310         lstrcpyW(nml.item.szID, Link->u.Link.szID);
1311     }
1312     else
1313     {
1314         nml.item.szID[0] = 0;
1315     }
1316     if(Link->u.Link.szUrl)
1317     {
1318         lstrcpyW(nml.item.szUrl, Link->u.Link.szUrl);
1319     }
1320     else
1321     {
1322         nml.item.szUrl[0] = 0;
1323     }
1324
1325     return SendMessageW(infoPtr->Notify, WM_NOTIFY, (WPARAM)nml.hdr.idFrom, (LPARAM)&nml);
1326 }
1327
1328 /***********************************************************************
1329  *           SYSLINK_SetFocus
1330  * Handles receiving the input focus.
1331  */
1332 static LRESULT SYSLINK_SetFocus (SYSLINK_INFO *infoPtr, HWND PrevFocusWindow)
1333 {
1334     PDOC_ITEM Focus;
1335
1336     infoPtr->HasFocus = TRUE;
1337
1338     /* We always select the first link, even if we activated the control using
1339        SHIFT+TAB. This is the default behavior */
1340     Focus = SYSLINK_GetNextLink(infoPtr, NULL);
1341     if(Focus != NULL)
1342     {
1343         SYSLINK_SetFocusLink(infoPtr, Focus);
1344     }
1345
1346     SYSLINK_RepaintLink(infoPtr, Focus);
1347
1348     return 0;
1349 }
1350
1351 /***********************************************************************
1352  *           SYSLINK_KillFocus
1353  * Handles losing the input focus.
1354  */
1355 static LRESULT SYSLINK_KillFocus (SYSLINK_INFO *infoPtr, HWND NewFocusWindow)
1356 {
1357     PDOC_ITEM Focus;
1358
1359     infoPtr->HasFocus = FALSE;
1360     Focus = SYSLINK_GetFocusLink(infoPtr, NULL);
1361
1362     if(Focus != NULL)
1363     {
1364         SYSLINK_RepaintLink(infoPtr, Focus);
1365     }
1366
1367     return 0;
1368 }
1369
1370 /***********************************************************************
1371  *           SYSLINK_LinkAtPt
1372  * Returns a link at the specified position
1373  */
1374 static PDOC_ITEM SYSLINK_LinkAtPt (SYSLINK_INFO *infoPtr, POINT *pt, int *LinkId, BOOL MustBeEnabled)
1375 {
1376     PDOC_ITEM Current;
1377     int id = 0;
1378
1379     for(Current = infoPtr->Items; Current != NULL; Current = Current->Next)
1380     {
1381         if((Current->Type == slLink) && SYSLINK_PtInDocItem(Current, *pt) &&
1382            (!MustBeEnabled || (MustBeEnabled && (Current->u.Link.state & LIS_ENABLED))))
1383         {
1384             if(LinkId != NULL)
1385             {
1386                 *LinkId = id;
1387             }
1388             return Current;
1389         }
1390         id++;
1391     }
1392
1393     return NULL;
1394 }
1395
1396 /***********************************************************************
1397  *           SYSLINK_LButtonDown
1398  * Handles mouse clicks
1399  */
1400 static LRESULT SYSLINK_LButtonDown (SYSLINK_INFO *infoPtr, DWORD Buttons, POINT *pt)
1401 {
1402     PDOC_ITEM Current, Old;
1403     int id;
1404
1405     Current = SYSLINK_LinkAtPt(infoPtr, pt, &id, TRUE);
1406     if(Current != NULL)
1407     {
1408       SetFocus(infoPtr->Self);
1409
1410       Old = SYSLINK_SetFocusLink(infoPtr, Current);
1411       if(Old != NULL && Old != Current)
1412       {
1413           SYSLINK_RepaintLink(infoPtr, Old);
1414       }
1415       infoPtr->MouseDownID = id;
1416       SYSLINK_RepaintLink(infoPtr, Current);
1417     }
1418
1419     return 0;
1420 }
1421
1422 /***********************************************************************
1423  *           SYSLINK_LButtonUp
1424  * Handles mouse clicks
1425  */
1426 static LRESULT SYSLINK_LButtonUp (SYSLINK_INFO *infoPtr, DWORD Buttons, POINT *pt)
1427 {
1428     if(infoPtr->MouseDownID > -1)
1429     {
1430         PDOC_ITEM Current;
1431         int id;
1432
1433         Current = SYSLINK_LinkAtPt(infoPtr, pt, &id, TRUE);
1434         if((Current != NULL) && (Current->u.Link.state & LIS_FOCUSED) && (infoPtr->MouseDownID == id))
1435         {
1436             SYSLINK_SendParentNotify(infoPtr, NM_CLICK, Current, id);
1437         }
1438     }
1439
1440     infoPtr->MouseDownID = -1;
1441
1442     return 0;
1443 }
1444
1445 /***********************************************************************
1446  *           SYSLINK_OnEnter
1447  * Handles ENTER key events
1448  */
1449 static BOOL SYSLINK_OnEnter (SYSLINK_INFO *infoPtr)
1450 {
1451     if(infoPtr->HasFocus)
1452     {
1453         PDOC_ITEM Focus;
1454         int id;
1455
1456         Focus = SYSLINK_GetFocusLink(infoPtr, &id);
1457         if(Focus != NULL)
1458         {
1459             SYSLINK_SendParentNotify(infoPtr, NM_RETURN, Focus, id);
1460             return TRUE;
1461         }
1462     }
1463     return FALSE;
1464 }
1465
1466 /***********************************************************************
1467  *           SYSKEY_SelectNextPrevLink
1468  * Changes the currently focused link
1469  */
1470 static BOOL SYSKEY_SelectNextPrevLink (SYSLINK_INFO *infoPtr, BOOL Prev)
1471 {
1472     if(infoPtr->HasFocus)
1473     {
1474         PDOC_ITEM Focus;
1475         int id;
1476
1477         Focus = SYSLINK_GetFocusLink(infoPtr, &id);
1478         if(Focus != NULL)
1479         {
1480             PDOC_ITEM NewFocus, OldFocus;
1481
1482             if(Prev)
1483                 NewFocus = SYSLINK_GetPrevLink(infoPtr, Focus);
1484             else
1485                 NewFocus = SYSLINK_GetNextLink(infoPtr, Focus);
1486
1487             if(NewFocus != NULL)
1488             {
1489                 OldFocus = SYSLINK_SetFocusLink(infoPtr, NewFocus);
1490
1491                 if(OldFocus != NewFocus)
1492                 {
1493                     SYSLINK_RepaintLink(infoPtr, OldFocus);
1494                 }
1495                 SYSLINK_RepaintLink(infoPtr, NewFocus);
1496                 return TRUE;
1497             }
1498         }
1499     }
1500     return FALSE;
1501 }
1502
1503 /***********************************************************************
1504  *           SYSKEY_SelectNextPrevLink
1505  * Determines if there's a next or previous link to decide whether the control
1506  * should capture the tab key message
1507  */
1508 static BOOL SYSLINK_NoNextLink (SYSLINK_INFO *infoPtr, BOOL Prev)
1509 {
1510     PDOC_ITEM Focus, NewFocus;
1511
1512     Focus = SYSLINK_GetFocusLink(infoPtr, NULL);
1513     if(Prev)
1514         NewFocus = SYSLINK_GetPrevLink(infoPtr, Focus);
1515     else
1516         NewFocus = SYSLINK_GetNextLink(infoPtr, Focus);
1517
1518     return NewFocus == NULL;
1519 }
1520
1521 /***********************************************************************
1522  *           SysLinkWindowProc
1523  */
1524 static LRESULT WINAPI SysLinkWindowProc(HWND hwnd, UINT message,
1525                                         WPARAM wParam, LPARAM lParam)
1526 {
1527     SYSLINK_INFO *infoPtr;
1528
1529     TRACE("hwnd=%p msg=%04x wparam=%x lParam=%lx\n", hwnd, message, wParam, lParam);
1530
1531     infoPtr = (SYSLINK_INFO *)GetWindowLongPtrW(hwnd, 0);
1532
1533     if (!infoPtr && message != WM_CREATE)
1534         goto HandleDefaultMessage;
1535
1536     switch(message) {
1537     case WM_PRINTCLIENT:
1538     case WM_PAINT:
1539         return SYSLINK_Paint (infoPtr, (HDC)wParam);
1540
1541     case WM_SETCURSOR:
1542     {
1543         LHITTESTINFO ht;
1544         DWORD mp = GetMessagePos();
1545
1546         ht.pt.x = (short)LOWORD(mp);
1547         ht.pt.y = (short)HIWORD(mp);
1548
1549         ScreenToClient(infoPtr->Self, &ht.pt);
1550         if(SYSLINK_HitTest (infoPtr, &ht))
1551         {
1552             SetCursor(LoadCursorW(0, (LPCWSTR)IDC_HAND));
1553             return TRUE;
1554         }
1555         /* let the default window proc handle this message */
1556         goto HandleDefaultMessage;
1557     }
1558
1559     case WM_SIZE:
1560     {
1561         HDC hdc = GetDC(infoPtr->Self);
1562         if(hdc != NULL)
1563         {
1564           SYSLINK_Render(infoPtr, hdc);
1565           ReleaseDC(infoPtr->Self, hdc);
1566         }
1567         return 0;
1568     }
1569
1570     case WM_GETFONT:
1571         return (LRESULT)infoPtr->Font;
1572
1573     case WM_SETFONT:
1574         return (LRESULT)SYSLINK_SetFont(infoPtr, (HFONT)wParam, (BOOL)lParam);
1575
1576     case WM_SETTEXT:
1577         SYSLINK_SetText(infoPtr, (LPWSTR)lParam);
1578         goto HandleDefaultMessage;
1579
1580     case WM_LBUTTONDOWN:
1581     {
1582         POINT pt;
1583         pt.x = LOWORD(lParam);
1584         pt.y = HIWORD(lParam);
1585         return SYSLINK_LButtonDown(infoPtr, wParam, &pt);
1586     }
1587     case WM_LBUTTONUP:
1588     {
1589         POINT pt;
1590         pt.x = LOWORD(lParam);
1591         pt.y = HIWORD(lParam);
1592         return SYSLINK_LButtonUp(infoPtr, wParam, &pt);
1593     }
1594
1595     case WM_KEYDOWN:
1596     {
1597         switch(wParam)
1598         {
1599         case VK_RETURN:
1600             SYSLINK_OnEnter(infoPtr);
1601             return 0;
1602         case VK_TAB:
1603         {
1604             BOOL shift = GetKeyState(VK_SHIFT) & 0x8000;
1605             SYSKEY_SelectNextPrevLink(infoPtr, shift);
1606             return 0;
1607         }
1608         }
1609         goto HandleDefaultMessage;
1610     }
1611
1612     case WM_GETDLGCODE:
1613     {
1614         LRESULT Ret = DLGC_HASSETSEL;
1615         int vk = (lParam != 0 ? (int)((LPMSG)lParam)->wParam : 0);
1616         switch(vk)
1617         {
1618         case VK_RETURN:
1619             Ret |= DLGC_WANTMESSAGE;
1620             break;
1621         case VK_TAB:
1622         {
1623             BOOL shift = GetKeyState(VK_SHIFT) & 0x8000;
1624             if(!SYSLINK_NoNextLink(infoPtr, shift))
1625             {
1626                 Ret |= DLGC_WANTTAB;
1627             }
1628             else
1629             {
1630                 Ret |= DLGC_WANTCHARS;
1631             }
1632             break;
1633         }
1634         }
1635         return Ret;
1636     }
1637
1638     case WM_NCHITTEST:
1639     {
1640         POINT pt;
1641         RECT rc;
1642         pt.x = LOWORD(lParam);
1643         pt.y = HIWORD(lParam);
1644
1645         GetClientRect(infoPtr->Self, &rc);
1646         ScreenToClient(infoPtr->Self, &pt);
1647         if(pt.x < 0 || pt.y < 0 || pt.x > rc.right || pt.y > rc.bottom)
1648         {
1649             return HTNOWHERE;
1650         }
1651
1652         if(SYSLINK_LinkAtPt(infoPtr, &pt, NULL, FALSE))
1653         {
1654             return HTCLIENT;
1655         }
1656
1657         return HTTRANSPARENT;
1658     }
1659
1660     case LM_HITTEST:
1661         return SYSLINK_HitTest(infoPtr, (PLHITTESTINFO)lParam);
1662
1663     case LM_SETITEM:
1664         return SYSLINK_SetItem(infoPtr, (PLITEM)lParam);
1665
1666     case LM_GETITEM:
1667         return SYSLINK_GetItem(infoPtr, (PLITEM)lParam);
1668
1669     case LM_GETIDEALHEIGHT:
1670         return SYSLINK_GetIdealHeight(infoPtr);
1671
1672     case WM_SETFOCUS:
1673         return SYSLINK_SetFocus(infoPtr, (HWND)wParam);
1674
1675     case WM_KILLFOCUS:
1676         return SYSLINK_KillFocus(infoPtr, (HWND)wParam);
1677
1678     case WM_ENABLE:
1679         infoPtr->Style &= ~WS_DISABLED;
1680         infoPtr->Style |= (wParam ? 0 : WS_DISABLED);
1681         InvalidateRect (infoPtr->Self, NULL, FALSE);
1682         return 0;
1683
1684     case WM_STYLECHANGED:
1685         if (wParam == GWL_STYLE)
1686         {
1687             infoPtr->Style = ((LPSTYLESTRUCT)lParam)->styleNew;
1688
1689             InvalidateRect(infoPtr->Self, NULL, TRUE);
1690         }
1691         return 0;
1692
1693     case WM_CREATE:
1694         /* allocate memory for info struct */
1695         infoPtr = Alloc (sizeof(SYSLINK_INFO));
1696         if (!infoPtr) return -1;
1697         SetWindowLongPtrW (hwnd, 0, (DWORD_PTR)infoPtr);
1698
1699         /* initialize the info struct */
1700         infoPtr->Self = hwnd;
1701         infoPtr->Notify = ((LPCREATESTRUCTW)lParam)->hwndParent;
1702         infoPtr->Style = ((LPCREATESTRUCTW)lParam)->style;
1703         infoPtr->Font = 0;
1704         infoPtr->LinkFont = 0;
1705         infoPtr->Items = NULL;
1706         infoPtr->HasFocus = FALSE;
1707         infoPtr->MouseDownID = -1;
1708         infoPtr->TextColor = GetSysColor(COLOR_WINDOWTEXT);
1709         infoPtr->LinkColor = GetSysColor(COLOR_HIGHLIGHT);
1710         infoPtr->VisitedColor = GetSysColor(COLOR_HIGHLIGHT);
1711         infoPtr->BreakChar = ' ';
1712         TRACE("SysLink Ctrl creation, hwnd=%p\n", hwnd);
1713         SYSLINK_SetText(infoPtr, ((LPCREATESTRUCTW)lParam)->lpszName);
1714         return 0;
1715
1716     case WM_DESTROY:
1717         TRACE("SysLink Ctrl destruction, hwnd=%p\n", hwnd);
1718         SYSLINK_ClearDoc(infoPtr);
1719         if(infoPtr->Font != 0) DeleteObject(infoPtr->Font);
1720         if(infoPtr->LinkFont != 0) DeleteObject(infoPtr->LinkFont);
1721         SetWindowLongPtrW(hwnd, 0, 0);
1722         Free (infoPtr);
1723         return 0;
1724
1725     default:
1726 HandleDefaultMessage:
1727         if ((message >= WM_USER) && (message < WM_APP))
1728         {
1729                 ERR("unknown msg %04x wp=%04x lp=%08lx\n", message, wParam, lParam );
1730         }
1731         return DefWindowProcW(hwnd, message, wParam, lParam);
1732     }
1733 }
1734
1735
1736 /***********************************************************************
1737  * SYSLINK_Register [Internal]
1738  *
1739  * Registers the SysLink window class.
1740  */
1741 VOID SYSLINK_Register (void)
1742 {
1743     WNDCLASSW wndClass;
1744
1745     ZeroMemory (&wndClass, sizeof(wndClass));
1746     wndClass.style         = CS_GLOBALCLASS | CS_VREDRAW | CS_HREDRAW;
1747     wndClass.lpfnWndProc   = SysLinkWindowProc;
1748     wndClass.cbClsExtra    = 0;
1749     wndClass.cbWndExtra    = sizeof (SYSLINK_INFO *);
1750     wndClass.hCursor       = LoadCursorW (0, (LPWSTR)IDC_ARROW);
1751     wndClass.lpszClassName = WC_LINK;
1752
1753     RegisterClassW (&wndClass);
1754 }
1755
1756
1757 /***********************************************************************
1758  * SYSLINK_Unregister [Internal]
1759  *
1760  * Unregisters the SysLink window class.
1761  */
1762 VOID SYSLINK_Unregister (void)
1763 {
1764     UnregisterClassW (WC_LINK, NULL);
1765 }