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