dlls/comctl32/syslink.c

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