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