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, strlenW(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                     }
 290                 }
 291
 292                 if(ValidLink && ValidParam)
 293                 {
 294                     /* the <a ...> tag appears to be valid. save all information
 295                        so we can add the link if we find a valid </a> tag later */
 296                     CurrentType = slLink;
 297                     linktext = current + taglen;
 298                     linklen = 0;
 299                     firsttag = current;
 300                 }
 301                 else
 302                 {
 303                     taglen = 1;
 304                     lpID = NULL;
 305                     lpUrl = NULL;
 306                     if(textstart == NULL)
 307                     {
 308                         textstart = current;
 309                     }
 310                 }
 311             }
 312             else if(!StrCmpNIW(current, SL_LINKCLOSE, 4) && (CurrentType == slLink) && firsttag)
 313             {
 314                 /* there's a <a...> tag opened, first add the previous text, if present */
 315                 if(textstart != NULL && textlen > 0 && firsttag > textstart)
 316                 {
 317                     Last = SYSLINK_AppendDocItem(infoPtr, textstart, firsttag - textstart, slText, Last);
 318                     if(Last == NULL)
 319                     {
 320                         ERR("Unable to create new document item!\n");
 321                         return docitems;
 322                     }
 323                     docitems++;
 324                     textstart = NULL;
 325                     textlen = 0;
 326                 }
 327
 328                 /* now it's time to add the link to the document */
 329                 current += 4;
 330                 if(linktext != NULL && linklen > 0)
 331                 {
 332                     Last = SYSLINK_AppendDocItem(infoPtr, linktext, linklen, slLink, Last);
 333                     if(Last == NULL)
 334                     {
 335                         ERR("Unable to create new document item!\n");
 336                         return docitems;
 337                     }
 338                     docitems++;
 339                     if(CurrentType == slLink)
 340                     {
 341                         int nc;
 342
 343                         if(!(infoPtr->Style & WS_DISABLED))
 344                         {
 345                             Last->u.Link.state |= LIS_ENABLED;
 346                         }
 347                         /* Copy the tag parameters */
 348                         if(lpID != NULL)
 349                         {
 350                             nc = min(lenId, strlenW(lpID));
 351                             nc = min(nc, MAX_LINKID_TEXT - 1);
 352                             Last->u.Link.szID = Alloc((nc + 1) * sizeof(WCHAR));
 353                             if(Last->u.Link.szID != NULL)
 354                             {
 355                                 lstrcpynW(Last->u.Link.szID, lpID, nc + 1);
 356                             }
 357                         }
 358                         else
 359                             Last->u.Link.szID = NULL;
 360                         if(lpUrl != NULL)
 361                         {
 362                             nc = min(lenUrl, strlenW(lpUrl));
 363                             nc = min(nc, L_MAX_URL_LENGTH - 1);
 364                             Last->u.Link.szUrl = Alloc((nc + 1) * sizeof(WCHAR));
 365                             if(Last->u.Link.szUrl != NULL)
 366                             {
 367                                 lstrcpynW(Last->u.Link.szUrl, lpUrl, nc + 1);
 368                             }
 369                         }
 370                         else
 371                             Last->u.Link.szUrl = NULL;
 372                     }
 373                     linktext = NULL;
 374                 }
 375                 CurrentType = slText;
 376                 firsttag = NULL;
 377                 textstart = NULL;
 378                 continue;
 379             }
 380             else
 381             {
 382                 /* we don't know what tag it is, so just continue */
 383                 taglen = 1;
 384                 linklen++;
 385                 if(CurrentType == slText && textstart == NULL)
 386                 {
 387                     textstart = current;
 388                 }
 389             }
 390
 391             textlen += taglen;
 392             current += taglen;
 393         }
 394         else
 395         {
 396             textlen++;
 397             linklen++;
 398
 399             /* save the pointer of the current text item if we couldn't find a tag */
 400             if(textstart == NULL && CurrentType == slText)
 401             {
 402                 textstart = current;
 403             }
 404
 405             current++;
 406         }
 407     }
 408
 409     if(textstart != NULL && textlen > 0)
 410     {
 411         Last = SYSLINK_AppendDocItem(infoPtr, textstart, textlen, CurrentType, Last);
 412         if(Last == NULL)
 413         {
 414             ERR("Unable to create new document item!\n");
 415             return docitems;
 416         }
 417         if(CurrentType == slLink)
 418         {
 419             int nc;
 420
 421             if(!(infoPtr->Style & WS_DISABLED))
 422             {
 423                 Last->u.Link.state |= LIS_ENABLED;
 424             }
 425             /* Copy the tag parameters */
 426             if(lpID != NULL)
 427             {
 428                 nc = min(lenId, strlenW(lpID));
 429                 nc = min(nc, MAX_LINKID_TEXT - 1);
 430                 Last->u.Link.szID = Alloc((nc + 1) * sizeof(WCHAR));
 431                 if(Last->u.Link.szID != NULL)
 432                 {
 433                     lstrcpynW(Last->u.Link.szID, lpID, nc + 1);
 434                 }
 435             }
 436             else
 437                 Last->u.Link.szID = NULL;
 438             if(lpUrl != NULL)
 439             {
 440                 nc = min(lenUrl, strlenW(lpUrl));
 441                 nc = min(nc, L_MAX_URL_LENGTH - 1);
 442                 Last->u.Link.szUrl = Alloc((nc + 1) * sizeof(WCHAR));
 443                 if(Last->u.Link.szUrl != NULL)
 444                 {
 445                     lstrcpynW(Last->u.Link.szUrl, lpUrl, nc + 1);
 446                 }
 447             }
 448             else
 449                 Last->u.Link.szUrl = NULL;
 450         }
 451         docitems++;
 452     }
 453
 454     if(linktext != NULL && linklen > 0)
 455     {
 456         /* we got an unclosed link, just display the text */
 457         Last = SYSLINK_AppendDocItem(infoPtr, linktext, linklen, slText, Last);
 458         if(Last == NULL)
 459         {
 460             ERR("Unable to create new document item!\n");
 461             return docitems;
 462         }
 463         docitems++;
 464     }
 465
 466     return docitems;
 467 }
 468
 469 /***********************************************************************
 470  * SYSLINK_RepaintLink
 471  * Repaints a link.
 472  */
 473 static VOID SYSLINK_RepaintLink (const SYSLINK_INFO *infoPtr, const DOC_ITEM *DocItem)
 474 {
 475     PDOC_TEXTBLOCK bl;
 476     int n;
 477
 478     if(DocItem->Type != slLink)
 479     {
 480         ERR("DocItem not a link!\n");
 481         return;
 482     }
 483
 484     bl = DocItem->Blocks;
 485     if (bl != NULL)
 486     {
 487         n = DocItem->nText;
 488
 489         while(n > 0)
 490         {
 491             InvalidateRect(infoPtr->Self, &bl->rc, TRUE);
 492             n -= bl->nChars + bl->nSkip;
 493             bl++;
 494         }
 495     }
 496 }
 497
 498 /***********************************************************************
 499  * SYSLINK_GetLinkItemByIndex
 500  * Retrieves a document link by its index
 501  */
 502 static PDOC_ITEM SYSLINK_GetLinkItemByIndex (const SYSLINK_INFO *infoPtr, int iLink)
 503 {
 504     PDOC_ITEM Current = infoPtr->Items;
 505
 506     while(Current != NULL)
 507     {
 508         if((Current->Type == slLink) && (iLink-- <= 0))
 509         {
 510             return Current;
 511         }
 512         Current = Current->Next;
 513     }
 514     return NULL;
 515 }
 516
 517 /***********************************************************************
 518  * SYSLINK_GetFocusLink
 519  * Retrieves the link that has the LIS_FOCUSED bit
 520  */
 521 static PDOC_ITEM SYSLINK_GetFocusLink (const SYSLINK_INFO *infoPtr, int *LinkId)
 522 {
 523     PDOC_ITEM Current = infoPtr->Items;
 524     int id = 0;
 525
 526     while(Current != NULL)
 527     {
 528         if((Current->Type == slLink))
 529         {
 530             if(Current->u.Link.state & LIS_FOCUSED)
 531             {
 532                 if(LinkId != NULL)
 533                     *LinkId = id;
 534                 return Current;
 535             }
 536             id++;
 537         }
 538         Current = Current->Next;
 539     }
 540     return NULL;
 541 }
 542
 543 /***********************************************************************
 544  * SYSLINK_GetNextLink
 545  * Gets the next link
 546  */
 547 static PDOC_ITEM SYSLINK_GetNextLink (const SYSLINK_INFO *infoPtr, PDOC_ITEM Current)
 548 {
 549     for(Current = (Current != NULL ? Current->Next : infoPtr->Items);
 550         Current != NULL;
 551         Current = Current->Next)
 552     {
 553         if(Current->Type == slLink)
 554         {
 555             return Current;
 556         }
 557     }
 558     return NULL;
 559 }
 560
 561 /***********************************************************************
 562  * SYSLINK_GetPrevLink
 563  * Gets the previous link
 564  */
 565 static PDOC_ITEM SYSLINK_GetPrevLink (const SYSLINK_INFO *infoPtr, PDOC_ITEM Current)
 566 {
 567     if(Current == NULL)
 568     {
 569         /* returns the last link */
 570         PDOC_ITEM Last = NULL;
 571
 572         for(Current = infoPtr->Items; Current != NULL; Current = Current->Next)
 573         {
 574             if(Current->Type == slLink)
 575             {
 576                 Last = Current;
 577             }
 578         }
 579         return Last;
 580     }
 581     else
 582     {
 583         /* returns the previous link */
 584         PDOC_ITEM Cur, Prev = NULL;
 585
 586         for(Cur = infoPtr->Items; Cur != NULL; Cur = Cur->Next)
 587         {
 588             if(Cur == Current)
 589             {
 590                 break;
 591             }
 592             if(Cur->Type == slLink)
 593             {
 594                 Prev = Cur;
 595             }
 596         }
 597         return Prev;
 598     }
 599 }
 600
 601 /***********************************************************************
 602  * SYSLINK_WrapLine
 603  * Tries to wrap a line.
 604  */
 605 static BOOL SYSLINK_WrapLine (LPWSTR Text, WCHAR BreakChar, int *LineLen,
 606                              int nFit, LPSIZE Extent)
 607 {
 608     WCHAR *Current;
 609
 610     if(nFit == *LineLen)
 611     {
 612         return FALSE;
 613     }
 614
 615     *LineLen = nFit;
 616
 617     Current = Text + nFit;
 618
 619     /* check if we're in the middle of a word */
 620     if((*Current) != BreakChar)
 621     {
 622         /* search for the beginning of the word */
 623         while(Current > Text && (*(Current - 1)) != BreakChar)
 624         {
 625             Current--;
 626             (*LineLen)--;
 627         }
 628
 629         if((*LineLen) == 0)
 630         {
 631             Extent->cx = 0;
 632             Extent->cy = 0;
 633         }
 634         return TRUE;
 635     }
 636
 637     return TRUE;
 638 }
 639
 640 /***********************************************************************
 641  * SYSLINK_Render
 642  * Renders the document in memory
 643  */
 644 static VOID SYSLINK_Render (const SYSLINK_INFO *infoPtr, HDC hdc, PRECT pRect)
 645 {
 646     RECT rc;
 647     PDOC_ITEM Current;
 648     HGDIOBJ hOldFont;
 649     int x, y, LineHeight;
 650     SIZE szDoc;
 651
 652     szDoc.cx = szDoc.cy = 0;
 653
 654     rc = *pRect;
 655     rc.right -= SL_RIGHTMARGIN;
 656     rc.bottom -= SL_BOTTOMMARGIN;
 657
 658     if(rc.right - SL_LEFTMARGIN < 0)
 659         rc.right = MAXLONG;
 660     if (rc.bottom - SL_TOPMARGIN < 0)
 661         rc.bottom = MAXLONG;
 662
 663     hOldFont = SelectObject(hdc, infoPtr->Font);
 664
 665     x = SL_LEFTMARGIN;
 666     y = SL_TOPMARGIN;
 667     LineHeight = 0;
 668
 669     for(Current = infoPtr->Items; Current != NULL; Current = Current->Next)
 670     {
 671         int n, nBlocks;
 672         LPWSTR tx;
 673         PDOC_TEXTBLOCK bl, cbl;
 674         INT nFit;
 675         SIZE szDim;
 676
 677         if(Current->nText == 0)
 678         {
 679             continue;
 680         }
 681
 682         tx = Current->Text;
 683         n = Current->nText;
 684
 685         Free(Current->Blocks);
 686         Current->Blocks = NULL;
 687         bl = NULL;
 688         nBlocks = 0;
 689
 690         if(Current->Type == slText)
 691         {
 692             SelectObject(hdc, infoPtr->Font);
 693         }
 694         else if(Current->Type == slLink)
 695         {
 696             SelectObject(hdc, infoPtr->LinkFont);
 697         }
 698
 699         while(n > 0)
 700         {
 701             int SkipChars = 0;
 702
 703             /* skip break characters unless they're the first of the doc item */
 704             if(tx != Current->Text || x == SL_LEFTMARGIN)
 705             {
 706                 while(n > 0 && (*tx) == infoPtr->BreakChar)
 707                 {
 708                     tx++;
 709                     SkipChars++;
 710                     n--;
 711                 }
 712             }
 713
 714             if((n == 0 && SkipChars != 0) ||
 715                GetTextExtentExPointW(hdc, tx, n, rc.right - x, &nFit, NULL, &szDim))
 716             {
 717                 int LineLen = n;
 718                 BOOL Wrap = FALSE;
 719                 PDOC_TEXTBLOCK nbl;
 720
 721                 if(n != 0)
 722                 {
 723                     Wrap = SYSLINK_WrapLine(tx, infoPtr->BreakChar, &LineLen, nFit, &szDim);
 724
 725                     if(LineLen == 0)
 726                     {
 727                         if(x > SL_LEFTMARGIN)
 728                         {
 729                             /* move one line down, the word didn't fit into the line */
 730                             x = SL_LEFTMARGIN;
 731                             y += LineHeight;
 732                             LineHeight = 0;
 733                             continue;
 734                         }
 735                         else
 736                         {
 737                             /* the word starts at the beginning of the line and doesn't
 738                                fit into the line, so break it at the last character that fits */
 739                             LineLen = max(nFit, 1);
 740                         }
 741                     }
 742
 743                     if(LineLen != n)
 744                     {
 745                         if(!GetTextExtentExPointW(hdc, tx, LineLen, rc.right - x, NULL, NULL, &szDim))
 746                         {
 747                             if(bl != NULL)
 748                             {
 749                                 Free(bl);
 750                                 bl = NULL;
 751                                 nBlocks = 0;
 752                             }
 753                             break;
 754                         }
 755                     }
 756                 }
 757
 758                 nbl = ReAlloc(bl, (nBlocks + 1) * sizeof(DOC_TEXTBLOCK));
 759                 if (nbl != NULL)
 760                 {
 761                     bl = nbl;
 762                     nBlocks++;
 763
 764                     cbl = bl + nBlocks - 1;
 765
 766                     cbl->nChars = LineLen;
 767                     cbl->nSkip = SkipChars;
 768                     cbl->rc.left = x;
 769                     cbl->rc.top = y;
 770                     cbl->rc.right = x + szDim.cx;
 771                     cbl->rc.bottom = y + szDim.cy;
 772
 773                     if (cbl->rc.right > szDoc.cx)
 774                         szDoc.cx = cbl->rc.right;
 775                     if (cbl->rc.bottom > szDoc.cy)
 776                         szDoc.cy = cbl->rc.bottom;
 777
 778                     if(LineLen != 0)
 779                     {
 780                         x += szDim.cx;
 781                         LineHeight = max(LineHeight, szDim.cy);
 782
 783                         if(Wrap)
 784                         {
 785                             x = SL_LEFTMARGIN;
 786                             y += LineHeight;
 787                             LineHeight = 0;
 788                         }
 789                     }
 790                 }
 791                 else
 792                 {
 793                     Free(bl);
 794                     bl = NULL;
 795                     nBlocks = 0;
 796
 797                     ERR("Failed to alloc DOC_TEXTBLOCK structure!\n");
 798                     break;
 799                 }
 800                 n -= LineLen;
 801                 tx += LineLen;
 802             }
 803             else
 804             {
 805                 n--;
 806             }
 807         }
 808
 809         if(nBlocks != 0)
 810         {
 811             Current->Blocks = bl;
 812         }
 813     }
 814
 815     SelectObject(hdc, hOldFont);
 816
 817     pRect->right = pRect->left + szDoc.cx;
 818     pRect->bottom = pRect->top + szDoc.cy;
 819 }
 820
 821 /***********************************************************************
 822  * SYSLINK_Draw
 823  * Draws the SysLink control.
 824  */
 825 static LRESULT SYSLINK_Draw (const SYSLINK_INFO *infoPtr, HDC hdc)
 826 {
 827     RECT rc;
 828     PDOC_ITEM Current;
 829     HFONT hOldFont;
 830     COLORREF OldTextColor, OldBkColor;
 831
 832     hOldFont = SelectObject(hdc, infoPtr->Font);
 833     OldTextColor = SetTextColor(hdc, infoPtr->TextColor);
 834     OldBkColor = SetBkColor(hdc, GetSysColor(COLOR_BTNFACE));
 835
 836     GetClientRect(infoPtr->Self, &rc);
 837     rc.right -= SL_RIGHTMARGIN + SL_LEFTMARGIN;
 838     rc.bottom -= SL_BOTTOMMARGIN + SL_TOPMARGIN;
 839
 840     if(rc.right < 0 || rc.bottom < 0) return 0;
 841
 842     for(Current = infoPtr->Items; Current != NULL; Current = Current->Next)
 843     {
 844         int n;
 845         LPWSTR tx;
 846         PDOC_TEXTBLOCK bl;
 847
 848         bl = Current->Blocks;
 849         if(bl != NULL)
 850         {
 851             tx = Current->Text;
 852             n = Current->nText;
 853
 854             if(Current->Type == slText)
 855             {
 856                  SelectObject(hdc, infoPtr->Font);
 857                  SetTextColor(hdc, infoPtr->TextColor);
 858             }
 859             else
 860             {
 861                  SelectObject(hdc, infoPtr->LinkFont);
 862                  SetTextColor(hdc, (!(Current->u.Link.state & LIS_VISITED) ? infoPtr->LinkColor : infoPtr->VisitedColor));
 863             }
 864
 865             while(n > 0)
 866             {
 867                 tx += bl->nSkip;
 868                 ExtTextOutW(hdc, bl->rc.left, bl->rc.top, ETO_OPAQUE | ETO_CLIPPED, &bl->rc, tx, bl->nChars, NULL);
 869                 if((Current->Type == slLink) && (Current->u.Link.state & LIS_FOCUSED) && infoPtr->HasFocus)
 870                 {
 871                     COLORREF PrevTextColor;
 872                     PrevTextColor = SetTextColor(hdc, infoPtr->TextColor);
 873                     DrawFocusRect(hdc, &bl->rc);
 874                     SetTextColor(hdc, PrevTextColor);
 875                 }
 876                 tx += bl->nChars;
 877                 n -= bl->nChars + bl->nSkip;
 878                 bl++;
 879             }
 880         }
 881     }
 882
 883     SetBkColor(hdc, OldBkColor);
 884     SetTextColor(hdc, OldTextColor);
 885     SelectObject(hdc, hOldFont);
 886
 887     return 0;
 888 }
 889
 890
 891 /***********************************************************************
 892  * SYSLINK_Paint
 893  * Handles the WM_PAINT message.
 894  */
 895 static LRESULT SYSLINK_Paint (const SYSLINK_INFO *infoPtr, HDC hdcParam)
 896 {
 897     HDC hdc;
 898     PAINTSTRUCT ps;
 899
 900     hdc = hdcParam ? hdcParam : BeginPaint (infoPtr->Self, &ps);
 901     if (hdc)
 902     {
 903         SYSLINK_Draw (infoPtr, hdc);
 904         if (!hdcParam) EndPaint (infoPtr->Self, &ps);
 905     }
 906     return 0;
 907 }
 908
 909
 910 /***********************************************************************
 911  *           SYSLINK_SetFont
 912  * Set new Font for the SysLink control.
 913  */
 914 static HFONT SYSLINK_SetFont (SYSLINK_INFO *infoPtr, HFONT hFont, BOOL bRedraw)
 915 {
 916     HDC hdc;
 917     LOGFONTW lf;
 918     TEXTMETRICW tm;
 919     RECT rcClient;
 920     HFONT hOldFont = infoPtr->Font;
 921     infoPtr->Font = hFont;
 922
 923     /* free the underline font */
 924     if(infoPtr->LinkFont != NULL)
 925     {
 926         DeleteObject(infoPtr->LinkFont);
 927         infoPtr->LinkFont = NULL;
 928     }
 929
 930     /* Render text position and word wrapping in memory */
 931     if (GetClientRect(infoPtr->Self, &rcClient))
 932     {
 933         hdc = GetDC(infoPtr->Self);
 934         if(hdc != NULL)
 935         {
 936             /* create a new underline font */
 937             if(GetTextMetricsW(hdc, &tm) &&
 938                GetObjectW(infoPtr->Font, sizeof(LOGFONTW), &lf))
 939             {
 940                 lf.lfUnderline = TRUE;
 941                 infoPtr->LinkFont = CreateFontIndirectW(&lf);
 942                 infoPtr->BreakChar = tm.tmBreakChar;
 943             }
 944             else
 945             {
 946                 ERR("Failed to create link font!\n");
 947             }
 948
 949             SYSLINK_Render(infoPtr, hdc, &rcClient);
 950             ReleaseDC(infoPtr->Self, hdc);
 951         }
 952     }
 953
 954     if(bRedraw)
 955     {
 956         RedrawWindow(infoPtr->Self, NULL, NULL, RDW_INVALIDATE | RDW_UPDATENOW);
 957     }
 958
 959     return hOldFont;
 960 }
 961
 962 /***********************************************************************
 963  *           SYSLINK_SetText
 964  * Set new text for the SysLink control.
 965  */
 966 static LRESULT SYSLINK_SetText (SYSLINK_INFO *infoPtr, LPCWSTR Text)
 967 {
 968     /* clear the document */
 969     SYSLINK_ClearDoc(infoPtr);
 970
 971     if(Text == NULL || *Text == 0)
 972     {
 973         return TRUE;
 974     }
 975
 976     /* let's parse the string and create a document */
 977     if(SYSLINK_ParseText(infoPtr, Text) > 0)
 978     {
 979         RECT rcClient;
 980
 981         /* Render text position and word wrapping in memory */
 982         if (GetClientRect(infoPtr->Self, &rcClient))
 983         {
 984             HDC hdc = GetDC(infoPtr->Self);
 985             if (hdc != NULL)
 986             {
 987                 SYSLINK_Render(infoPtr, hdc, &rcClient);
 988                 ReleaseDC(infoPtr->Self, hdc);
 989
 990                 InvalidateRect(infoPtr->Self, NULL, TRUE);
 991             }
 992         }
 993     }
 994
 995     return TRUE;
 996 }
 997
 998 /***********************************************************************
 999  *           SYSLINK_SetFocusLink
1000  * Updates the focus status bits and focusses the specified link.
1001  * If no document item is specified, the focus bit will be removed from all links.
1002  * Returns the previous focused item.
1003  */
1004 static PDOC_ITEM SYSLINK_SetFocusLink (const SYSLINK_INFO *infoPtr, const DOC_ITEM *DocItem)
1005 {
1006     PDOC_ITEM Current, PrevFocus = NULL;
1007
1008     for(Current = infoPtr->Items; Current != NULL; Current = Current->Next)
1009     {
1010         if(Current->Type == slLink)
1011         {
1012             if((PrevFocus == NULL) && (Current->u.Link.state & LIS_FOCUSED))
1013             {
1014                 PrevFocus = Current;
1015             }
1016
1017             if(Current == DocItem)
1018             {
1019                 Current->u.Link.state |= LIS_FOCUSED;
1020             }
1021             else
1022             {
1023                 Current->u.Link.state &= ~LIS_FOCUSED;
1024             }
1025         }
1026     }
1027
1028     return PrevFocus;
1029 }
1030
1031 /***********************************************************************
1032  *           SYSLINK_SetItem
1033  * Sets the states and attributes of a link item.
1034  */
1035 static LRESULT SYSLINK_SetItem (const SYSLINK_INFO *infoPtr, const LITEM *Item)
1036 {
1037     PDOC_ITEM di;
1038     int nc;
1039     PWSTR szId = NULL;
1040     PWSTR szUrl = NULL;
1041     BOOL Repaint = FALSE;
1042
1043     if(!(Item->mask & LIF_ITEMINDEX) || !(Item->mask & (LIF_FLAGSMASK)))
1044     {
1045         ERR("Invalid Flags!\n");
1046         return FALSE;
1047     }
1048
1049     di = SYSLINK_GetLinkItemByIndex(infoPtr, Item->iLink);
1050     if(di == NULL)
1051     {
1052         ERR("Link %d couldn't be found\n", Item->iLink);
1053         return FALSE;
1054     }
1055
1056     if(Item->mask & LIF_ITEMID)
1057     {
1058         nc = min(lstrlenW(Item->szID), MAX_LINKID_TEXT - 1);
1059         szId = Alloc((nc + 1) * sizeof(WCHAR));
1060         if(szId)
1061         {
1062             lstrcpynW(szId, Item->szID, nc + 1);
1063         }
1064         else
1065         {
1066             ERR("Unable to allocate memory for link id\n");
1067             return FALSE;
1068         }
1069     }
1070
1071     if(Item->mask & LIF_URL)
1072     {
1073         nc = min(lstrlenW(Item->szUrl), L_MAX_URL_LENGTH - 1);
1074         szUrl = Alloc((nc + 1) * sizeof(WCHAR));
1075         if(szUrl)
1076         {
1077             lstrcpynW(szUrl, Item->szUrl, nc + 1);
1078         }
1079         else
1080         {
1081             Free(szId);
1082
1083             ERR("Unable to allocate memory for link url\n");
1084             return FALSE;
1085         }
1086     }
1087
1088     if(Item->mask & LIF_ITEMID)
1089     {
1090         Free(di->u.Link.szID);
1091         di->u.Link.szID = szId;
1092     }
1093
1094     if(Item->mask & LIF_URL)
1095     {
1096         Free(di->u.Link.szUrl);
1097         di->u.Link.szUrl = szUrl;
1098     }
1099
1100     if(Item->mask & LIF_STATE)
1101     {
1102         UINT oldstate = di->u.Link.state;
1103         /* clear the masked bits */
1104         di->u.Link.state &= ~(Item->stateMask & LIS_MASK);
1105         /* copy the bits */
1106         di->u.Link.state |= (Item->state & Item->stateMask) & LIS_MASK;
1107         Repaint = (oldstate != di->u.Link.state);
1108
1109         /* update the focus */
1110         SYSLINK_SetFocusLink(infoPtr, ((di->u.Link.state & LIS_FOCUSED) ? di : NULL));
1111     }
1112
1113     if(Repaint)
1114     {
1115         SYSLINK_RepaintLink(infoPtr, di);
1116     }
1117
1118     return TRUE;
1119 }
1120
1121 /***********************************************************************
1122  *           SYSLINK_GetItem
1123  * Retrieves the states and attributes of a link item.
1124  */
1125 static LRESULT SYSLINK_GetItem (const SYSLINK_INFO *infoPtr, PLITEM Item)
1126 {
1127     PDOC_ITEM di;
1128
1129     if(!(Item->mask & LIF_ITEMINDEX) || !(Item->mask & (LIF_FLAGSMASK)))
1130     {
1131         ERR("Invalid Flags!\n");
1132         return FALSE;
1133     }
1134
1135     di = SYSLINK_GetLinkItemByIndex(infoPtr, Item->iLink);
1136     if(di == NULL)
1137     {
1138         ERR("Link %d couldn't be found\n", Item->iLink);
1139         return FALSE;
1140     }
1141
1142     if(Item->mask & LIF_STATE)
1143     {
1144         Item->state = (di->u.Link.state & Item->stateMask);
1145         if(!infoPtr->HasFocus)
1146         {
1147             /* remove the LIS_FOCUSED bit if the control doesn't have focus */
1148             Item->state &= ~LIS_FOCUSED;
1149         }
1150     }
1151
1152     if(Item->mask & LIF_ITEMID)
1153     {
1154         if(di->u.Link.szID)
1155         {
1156             lstrcpyW(Item->szID, di->u.Link.szID);
1157         }
1158         else
1159         {
1160             Item->szID[0] = 0;
1161         }
1162     }
1163
1164     if(Item->mask & LIF_URL)
1165     {
1166         if(di->u.Link.szUrl)
1167         {
1168             lstrcpyW(Item->szUrl, di->u.Link.szUrl);
1169         }
1170         else
1171         {
1172             Item->szUrl[0] = 0;
1173         }
1174     }
1175
1176     return TRUE;
1177 }
1178
1179 /***********************************************************************
1180  *           SYSLINK_PtInDocItem
1181  * Determines if a point is in the region of a document item
1182  */
1183 static BOOL SYSLINK_PtInDocItem (const DOC_ITEM *DocItem, POINT pt)
1184 {
1185     PDOC_TEXTBLOCK bl;
1186     int n;
1187
1188     bl = DocItem->Blocks;
1189     if (bl != NULL)
1190     {
1191         n = DocItem->nText;
1192
1193         while(n > 0)
1194         {
1195             if (PtInRect(&bl->rc, pt))
1196             {
1197                 return TRUE;
1198             }
1199             n -= bl->nChars + bl->nSkip;
1200             bl++;
1201         }
1202     }
1203
1204     return FALSE;
1205 }
1206
1207 /***********************************************************************
1208  *           SYSLINK_HitTest
1209  * Determines the link the user clicked on.
1210  */
1211 static LRESULT SYSLINK_HitTest (const SYSLINK_INFO *infoPtr, PLHITTESTINFO HitTest)
1212 {
1213     PDOC_ITEM Current;
1214     int id = 0;
1215
1216     for(Current = infoPtr->Items; Current != NULL; Current = Current->Next)
1217     {
1218         if(Current->Type == slLink)
1219         {
1220             if(SYSLINK_PtInDocItem(Current, HitTest->pt))
1221             {
1222                 HitTest->item.mask = 0;
1223                 HitTest->item.iLink = id;
1224                 HitTest->item.state = 0;
1225                 HitTest->item.stateMask = 0;
1226                 if(Current->u.Link.szID)
1227                 {
1228                     lstrcpyW(HitTest->item.szID, Current->u.Link.szID);
1229                 }
1230                 else
1231                 {
1232                     HitTest->item.szID[0] = 0;
1233                 }
1234                 if(Current->u.Link.szUrl)
1235                 {
1236                     lstrcpyW(HitTest->item.szUrl, Current->u.Link.szUrl);
1237                 }
1238                 else
1239                 {
1240                     HitTest->item.szUrl[0] = 0;
1241                 }
1242                 return TRUE;
1243             }
1244             id++;
1245         }
1246     }
1247
1248     return FALSE;
1249 }
1250
1251 /***********************************************************************
1252  *           SYSLINK_GetIdealHeight
1253  * Returns the preferred height of a link at the current control's width.
1254  */
1255 static LRESULT SYSLINK_GetIdealHeight (const SYSLINK_INFO *infoPtr)
1256 {
1257     HDC hdc = GetDC(infoPtr->Self);
1258     if(hdc != NULL)
1259     {
1260         LRESULT height;
1261         TEXTMETRICW tm;
1262         HGDIOBJ hOldFont = SelectObject(hdc, infoPtr->Font);
1263
1264         if(GetTextMetricsW(hdc, &tm))
1265         {
1266             height = tm.tmHeight;
1267         }
1268         else
1269         {
1270             height = 0;
1271         }
1272         SelectObject(hdc, hOldFont);
1273         ReleaseDC(infoPtr->Self, hdc);
1274
1275         return height;
1276     }
1277     return 0;
1278 }
1279
1280 /***********************************************************************
1281  *           SYSLINK_SendParentNotify
1282  * Sends a WM_NOTIFY message to the parent window.
1283  */
1284 static LRESULT SYSLINK_SendParentNotify (const SYSLINK_INFO *infoPtr, UINT code, const DOC_ITEM *Link, int iLink)
1285 {
1286     NMLINK nml;
1287
1288     nml.hdr.hwndFrom = infoPtr->Self;
1289     nml.hdr.idFrom = GetWindowLongPtrW(infoPtr->Self, GWLP_ID);
1290     nml.hdr.code = code;
1291
1292     nml.item.mask = 0;
1293     nml.item.iLink = iLink;
1294     nml.item.state = 0;
1295     nml.item.stateMask = 0;
1296     if(Link->u.Link.szID)
1297     {
1298         lstrcpyW(nml.item.szID, Link->u.Link.szID);
1299     }
1300     else
1301     {
1302         nml.item.szID[0] = 0;
1303     }
1304     if(Link->u.Link.szUrl)
1305     {
1306         lstrcpyW(nml.item.szUrl, Link->u.Link.szUrl);
1307     }
1308     else
1309     {
1310         nml.item.szUrl[0] = 0;
1311     }
1312
1313     return SendMessageW(infoPtr->Notify, WM_NOTIFY, nml.hdr.idFrom, (LPARAM)&nml);
1314 }
1315
1316 /***********************************************************************
1317  *           SYSLINK_SetFocus
1318  * Handles receiving the input focus.
1319  */
1320 static LRESULT SYSLINK_SetFocus (SYSLINK_INFO *infoPtr)
1321 {
1322     PDOC_ITEM Focus;
1323
1324     infoPtr->HasFocus = TRUE;
1325
1326     /* We always select the first link, even if we activated the control using
1327        SHIFT+TAB. This is the default behavior */
1328     Focus = SYSLINK_GetNextLink(infoPtr, NULL);
1329     if(Focus != NULL)
1330     {
1331         SYSLINK_SetFocusLink(infoPtr, Focus);
1332     }
1333
1334     SYSLINK_RepaintLink(infoPtr, Focus);
1335
1336     return 0;
1337 }
1338
1339 /***********************************************************************
1340  *           SYSLINK_KillFocus
1341  * Handles losing the input focus.
1342  */
1343 static LRESULT SYSLINK_KillFocus (SYSLINK_INFO *infoPtr)
1344 {
1345     PDOC_ITEM Focus;
1346
1347     infoPtr->HasFocus = FALSE;
1348     Focus = SYSLINK_GetFocusLink(infoPtr, NULL);
1349
1350     if(Focus != NULL)
1351     {
1352         SYSLINK_RepaintLink(infoPtr, Focus);
1353     }
1354
1355     return 0;
1356 }
1357
1358 /***********************************************************************
1359  *           SYSLINK_LinkAtPt
1360  * Returns a link at the specified position
1361  */
1362 static PDOC_ITEM SYSLINK_LinkAtPt (const SYSLINK_INFO *infoPtr, const POINT *pt, int *LinkId, BOOL MustBeEnabled)
1363 {
1364     PDOC_ITEM Current;
1365     int id = 0;
1366
1367     for(Current = infoPtr->Items; Current != NULL; Current = Current->Next)
1368     {
1369         if((Current->Type == slLink) && SYSLINK_PtInDocItem(Current, *pt) &&
1370            (!MustBeEnabled || (MustBeEnabled && (Current->u.Link.state & LIS_ENABLED))))
1371         {
1372             if(LinkId != NULL)
1373             {
1374                 *LinkId = id;
1375             }
1376             return Current;
1377         }
1378         id++;
1379     }
1380
1381     return NULL;
1382 }
1383
1384 /***********************************************************************
1385  *           SYSLINK_LButtonDown
1386  * Handles mouse clicks
1387  */
1388 static LRESULT SYSLINK_LButtonDown (SYSLINK_INFO *infoPtr, const POINT *pt)
1389 {
1390     PDOC_ITEM Current, Old;
1391     int id;
1392
1393     Current = SYSLINK_LinkAtPt(infoPtr, pt, &id, TRUE);
1394     if(Current != NULL)
1395     {
1396       SetFocus(infoPtr->Self);
1397
1398       Old = SYSLINK_SetFocusLink(infoPtr, Current);
1399       if(Old != NULL && Old != Current)
1400       {
1401           SYSLINK_RepaintLink(infoPtr, Old);
1402       }
1403       infoPtr->MouseDownID = id;
1404       SYSLINK_RepaintLink(infoPtr, Current);
1405     }
1406
1407     return 0;
1408 }
1409
1410 /***********************************************************************
1411  *           SYSLINK_LButtonUp
1412  * Handles mouse clicks
1413  */
1414 static LRESULT SYSLINK_LButtonUp (SYSLINK_INFO *infoPtr, const POINT *pt)
1415 {
1416     if(infoPtr->MouseDownID > -1)
1417     {
1418         PDOC_ITEM Current;
1419         int id;
1420
1421         Current = SYSLINK_LinkAtPt(infoPtr, pt, &id, TRUE);
1422         if((Current != NULL) && (Current->u.Link.state & LIS_FOCUSED) && (infoPtr->MouseDownID == id))
1423         {
1424             SYSLINK_SendParentNotify(infoPtr, NM_CLICK, Current, id);
1425         }
1426     }
1427
1428     infoPtr->MouseDownID = -1;
1429
1430     return 0;
1431 }
1432
1433 /***********************************************************************
1434  *           SYSLINK_OnEnter
1435  * Handles ENTER key events
1436  */
1437 static BOOL SYSLINK_OnEnter (const SYSLINK_INFO *infoPtr)
1438 {
1439     if(infoPtr->HasFocus)
1440     {
1441         PDOC_ITEM Focus;
1442         int id;
1443
1444         Focus = SYSLINK_GetFocusLink(infoPtr, &id);
1445         if(Focus != NULL)
1446         {
1447             SYSLINK_SendParentNotify(infoPtr, NM_RETURN, Focus, id);
1448             return TRUE;
1449         }
1450     }
1451     return FALSE;
1452 }
1453
1454 /***********************************************************************
1455  *           SYSKEY_SelectNextPrevLink
1456  * Changes the currently focused link
1457  */
1458 static BOOL SYSKEY_SelectNextPrevLink (const SYSLINK_INFO *infoPtr, BOOL Prev)
1459 {
1460     if(infoPtr->HasFocus)
1461     {
1462         PDOC_ITEM Focus;
1463         int id;
1464
1465         Focus = SYSLINK_GetFocusLink(infoPtr, &id);
1466         if(Focus != NULL)
1467         {
1468             PDOC_ITEM NewFocus, OldFocus;
1469
1470             if(Prev)
1471                 NewFocus = SYSLINK_GetPrevLink(infoPtr, Focus);
1472             else
1473                 NewFocus = SYSLINK_GetNextLink(infoPtr, Focus);
1474
1475             if(NewFocus != NULL)
1476             {
1477                 OldFocus = SYSLINK_SetFocusLink(infoPtr, NewFocus);
1478
1479                 if(OldFocus != NewFocus)
1480                 {
1481                     SYSLINK_RepaintLink(infoPtr, OldFocus);
1482                 }
1483                 SYSLINK_RepaintLink(infoPtr, NewFocus);
1484                 return TRUE;
1485             }
1486         }
1487     }
1488     return FALSE;
1489 }
1490
1491 /***********************************************************************
1492  *           SYSKEY_SelectNextPrevLink
1493  * Determines if there's a next or previous link to decide whether the control
1494  * should capture the tab key message
1495  */
1496 static BOOL SYSLINK_NoNextLink (const SYSLINK_INFO *infoPtr, BOOL Prev)
1497 {
1498     PDOC_ITEM Focus, NewFocus;
1499
1500     Focus = SYSLINK_GetFocusLink(infoPtr, NULL);
1501     if(Prev)
1502         NewFocus = SYSLINK_GetPrevLink(infoPtr, Focus);
1503     else
1504         NewFocus = SYSLINK_GetNextLink(infoPtr, Focus);
1505
1506     return NewFocus == NULL;
1507 }
1508
1509 /***********************************************************************
1510  *           SYSLINK_GetIdealSize
1511  * Calculates the ideal size of a link control at a given maximum width.
1512  */
1513 static VOID SYSLINK_GetIdealSize (const SYSLINK_INFO *infoPtr, int cxMaxWidth, LPSIZE lpSize)
1514 {
1515     RECT rc;
1516     HDC hdc;
1517
1518     rc.left = rc.top = rc.bottom = 0;
1519     rc.right = cxMaxWidth;
1520
1521     hdc = GetDC(infoPtr->Self);
1522     if (hdc != NULL)
1523     {
1524         HGDIOBJ hOldFont = SelectObject(hdc, infoPtr->Font);
1525
1526         SYSLINK_Render(infoPtr, hdc, &rc);
1527
1528         SelectObject(hdc, hOldFont);
1529         ReleaseDC(infoPtr->Self, hdc);
1530
1531         lpSize->cx = rc.right;
1532         lpSize->cy = rc.bottom;
1533     }
1534 }
1535
1536 /***********************************************************************
1537  *           SysLinkWindowProc
1538  */
1539 static LRESULT WINAPI SysLinkWindowProc(HWND hwnd, UINT message,
1540                                         WPARAM wParam, LPARAM lParam)
1541 {
1542     SYSLINK_INFO *infoPtr;
1543
1544     TRACE("hwnd=%p msg=%04x wparam=%lx lParam=%lx\n", hwnd, message, wParam, lParam);
1545
1546     infoPtr = (SYSLINK_INFO *)GetWindowLongPtrW(hwnd, 0);
1547
1548     if (!infoPtr && message != WM_CREATE)
1549         goto HandleDefaultMessage;
1550
1551     switch(message) {
1552     case WM_PRINTCLIENT:
1553     case WM_PAINT:
1554         return SYSLINK_Paint (infoPtr, (HDC)wParam);
1555
1556     case WM_SETCURSOR:
1557     {
1558         LHITTESTINFO ht;
1559         DWORD mp = GetMessagePos();
1560
1561         ht.pt.x = (short)LOWORD(mp);
1562         ht.pt.y = (short)HIWORD(mp);
1563
1564         ScreenToClient(infoPtr->Self, &ht.pt);
1565         if(SYSLINK_HitTest (infoPtr, &ht))
1566         {
1567             SetCursor(LoadCursorW(0, (LPCWSTR)IDC_HAND));
1568             return TRUE;
1569         }
1570         /* let the default window proc handle this message */
1571         goto HandleDefaultMessage;
1572     }
1573
1574     case WM_SIZE:
1575     {
1576         RECT rcClient;
1577         if (GetClientRect(infoPtr->Self, &rcClient))
1578         {
1579             HDC hdc = GetDC(infoPtr->Self);
1580             if(hdc != NULL)
1581             {
1582                 SYSLINK_Render(infoPtr, hdc, &rcClient);
1583                 ReleaseDC(infoPtr->Self, hdc);
1584             }
1585         }
1586         return 0;
1587     }
1588
1589     case WM_GETFONT:
1590         return (LRESULT)infoPtr->Font;
1591
1592     case WM_SETFONT:
1593         return (LRESULT)SYSLINK_SetFont(infoPtr, (HFONT)wParam, (BOOL)lParam);
1594
1595     case WM_SETTEXT:
1596         SYSLINK_SetText(infoPtr, (LPWSTR)lParam);
1597         goto HandleDefaultMessage;
1598
1599     case WM_LBUTTONDOWN:
1600     {
1601         POINT pt;
1602         pt.x = (short)LOWORD(lParam);
1603         pt.y = (short)HIWORD(lParam);
1604         return SYSLINK_LButtonDown(infoPtr, &pt);
1605     }
1606     case WM_LBUTTONUP:
1607     {
1608         POINT pt;
1609         pt.x = (short)LOWORD(lParam);
1610         pt.y = (short)HIWORD(lParam);
1611         return SYSLINK_LButtonUp(infoPtr, &pt);
1612     }
1613
1614     case WM_KEYDOWN:
1615     {
1616         switch(wParam)
1617         {
1618         case VK_RETURN:
1619             SYSLINK_OnEnter(infoPtr);
1620             return 0;
1621         case VK_TAB:
1622         {
1623             BOOL shift = GetKeyState(VK_SHIFT) & 0x8000;
1624             SYSKEY_SelectNextPrevLink(infoPtr, shift);
1625             return 0;
1626         }
1627         }
1628         goto HandleDefaultMessage;
1629     }
1630
1631     case WM_GETDLGCODE:
1632     {
1633         LRESULT Ret = DLGC_HASSETSEL;
1634         int vk = (lParam != 0 ? (int)((LPMSG)lParam)->wParam : 0);
1635         switch(vk)
1636         {
1637         case VK_RETURN:
1638             Ret |= DLGC_WANTMESSAGE;
1639             break;
1640         case VK_TAB:
1641         {
1642             BOOL shift = GetKeyState(VK_SHIFT) & 0x8000;
1643             if(!SYSLINK_NoNextLink(infoPtr, shift))
1644             {
1645                 Ret |= DLGC_WANTTAB;
1646             }
1647             else
1648             {
1649                 Ret |= DLGC_WANTCHARS;
1650             }
1651             break;
1652         }
1653         }
1654         return Ret;
1655     }
1656
1657     case WM_NCHITTEST:
1658     {
1659         POINT pt;
1660         RECT rc;
1661         pt.x = (short)LOWORD(lParam);
1662         pt.y = (short)HIWORD(lParam);
1663
1664         GetClientRect(infoPtr->Self, &rc);
1665         ScreenToClient(infoPtr->Self, &pt);
1666         if(pt.x < 0 || pt.y < 0 || pt.x > rc.right || pt.y > rc.bottom)
1667         {
1668             return HTNOWHERE;
1669         }
1670
1671         if(SYSLINK_LinkAtPt(infoPtr, &pt, NULL, FALSE))
1672         {
1673             return HTCLIENT;
1674         }
1675
1676         return HTTRANSPARENT;
1677     }
1678
1679     case LM_HITTEST:
1680         return SYSLINK_HitTest(infoPtr, (PLHITTESTINFO)lParam);
1681
1682     case LM_SETITEM:
1683         return SYSLINK_SetItem(infoPtr, (PLITEM)lParam);
1684
1685     case LM_GETITEM:
1686         return SYSLINK_GetItem(infoPtr, (PLITEM)lParam);
1687
1688     case LM_GETIDEALHEIGHT:
1689         if (lParam)
1690         {
1691             /* LM_GETIDEALSIZE */
1692             SYSLINK_GetIdealSize(infoPtr, (int)wParam, (LPSIZE)lParam);
1693         }
1694         return SYSLINK_GetIdealHeight(infoPtr);
1695
1696     case WM_SETFOCUS:
1697         return SYSLINK_SetFocus(infoPtr);
1698
1699     case WM_KILLFOCUS:
1700         return SYSLINK_KillFocus(infoPtr);
1701
1702     case WM_ENABLE:
1703         infoPtr->Style &= ~WS_DISABLED;
1704         infoPtr->Style |= (wParam ? 0 : WS_DISABLED);
1705         InvalidateRect (infoPtr->Self, NULL, FALSE);
1706         return 0;
1707
1708     case WM_STYLECHANGED:
1709         if (wParam == GWL_STYLE)
1710         {
1711             infoPtr->Style = ((LPSTYLESTRUCT)lParam)->styleNew;
1712
1713             InvalidateRect(infoPtr->Self, NULL, TRUE);
1714         }
1715         return 0;
1716
1717     case WM_CREATE:
1718         /* allocate memory for info struct */
1719         infoPtr = Alloc (sizeof(SYSLINK_INFO));
1720         if (!infoPtr) return -1;
1721         SetWindowLongPtrW (hwnd, 0, (DWORD_PTR)infoPtr);
1722
1723         /* initialize the info struct */
1724         infoPtr->Self = hwnd;
1725         infoPtr->Notify = ((LPCREATESTRUCTW)lParam)->hwndParent;
1726         infoPtr->Style = ((LPCREATESTRUCTW)lParam)->style;
1727         infoPtr->Font = 0;
1728         infoPtr->LinkFont = 0;
1729         infoPtr->Items = NULL;
1730         infoPtr->HasFocus = FALSE;
1731         infoPtr->MouseDownID = -1;
1732         infoPtr->TextColor = GetSysColor(COLOR_WINDOWTEXT);
1733         infoPtr->LinkColor = GetSysColor(COLOR_HIGHLIGHT);
1734         infoPtr->VisitedColor = GetSysColor(COLOR_HIGHLIGHT);
1735         infoPtr->BreakChar = ' ';
1736         TRACE("SysLink Ctrl creation, hwnd=%p\n", hwnd);
1737         SYSLINK_SetText(infoPtr, ((LPCREATESTRUCTW)lParam)->lpszName);
1738         return 0;
1739
1740     case WM_DESTROY:
1741         TRACE("SysLink Ctrl destruction, hwnd=%p\n", hwnd);
1742         SYSLINK_ClearDoc(infoPtr);
1743         if(infoPtr->Font != 0) DeleteObject(infoPtr->Font);
1744         if(infoPtr->LinkFont != 0) DeleteObject(infoPtr->LinkFont);
1745         SetWindowLongPtrW(hwnd, 0, 0);
1746         Free (infoPtr);
1747         return 0;
1748
1749     default:
1750 HandleDefaultMessage:
1751         if ((message >= WM_USER) && (message < WM_APP) && !COMCTL32_IsReflectedMessage(message))
1752         {
1753             ERR("unknown msg %04x wp=%04lx lp=%08lx\n", message, wParam, lParam );
1754         }
1755         return DefWindowProcW(hwnd, message, wParam, lParam);
1756     }
1757 }
1758
1759
1760 /***********************************************************************
1761  * SYSLINK_Register [Internal]
1762  *
1763  * Registers the SysLink window class.
1764  */
1765 VOID SYSLINK_Register (void)
1766 {
1767     WNDCLASSW wndClass;
1768
1769     ZeroMemory (&wndClass, sizeof(wndClass));
1770     wndClass.style         = CS_GLOBALCLASS | CS_VREDRAW | CS_HREDRAW;
1771     wndClass.lpfnWndProc   = SysLinkWindowProc;
1772     wndClass.cbClsExtra    = 0;
1773     wndClass.cbWndExtra    = sizeof (SYSLINK_INFO *);
1774     wndClass.hCursor       = LoadCursorW (0, (LPWSTR)IDC_ARROW);
1775     wndClass.lpszClassName = WC_LINK;
1776
1777     RegisterClassW (&wndClass);
1778 }
1779
1780
1781 /***********************************************************************
1782  * SYSLINK_Unregister [Internal]
1783  *
1784  * Unregisters the SysLink window class.
1785  */
1786 VOID SYSLINK_Unregister (void)
1787 {
1788     UnregisterClassW (WC_LINK, NULL);
1789 }