dlls/comctl32/syslink.c

   1 /*
   2  * SysLink control
   3  *
   4  * Copyright 2004 - 2006 Thomas Weidenmueller <w3seek@reactos.com>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include <stdarg.h>
  22 #include <string.h>
  23 #include "windef.h"
  24 #include "winbase.h"
  25 #include "wingdi.h"
  26 #include "winuser.h"
  27 #include "winnls.h"
  28 #include "commctrl.h"
  29 #include "comctl32.h"
  30 #include "wine/debug.h"
  31 #include "wine/list.h"
  32
  33 WINE_DEFAULT_DEBUG_CHANNEL(syslink);
  34
  35 typedef struct
  36 {
  37     int nChars;
  38     int nSkip;
  39     RECT rc;
  40 } DOC_TEXTBLOCK, *PDOC_TEXTBLOCK;
  41
  42 #define LIF_FLAGSMASK   (LIF_STATE | LIF_ITEMID | LIF_URL)
  43 #define LIS_MASK        (LIS_FOCUSED | LIS_ENABLED | LIS_VISITED)
  44
  45 typedef enum
  46 {
  47     slText = 0,
  48     slLink
  49 } SL_ITEM_TYPE;
  50
  51 typedef struct _DOC_ITEM
  52 {
  53     struct list entry;
  54     UINT nText;             /* Number of characters of the text */
  55     SL_ITEM_TYPE Type;      /* type of the item */
  56     PDOC_TEXTBLOCK Blocks;  /* Array of text blocks */
  57     union
  58     {
  59         struct
  60         {
  61             UINT state;     /* Link state */
  62             WCHAR *szID;    /* Link ID string */
  63             WCHAR *szUrl;   /* Link URL string */
  64         } Link;
  65         struct
  66         {
  67             UINT Dummy;
  68         } Text;
  69     } u;
  70     WCHAR Text[1];          /* Text of the document item */
  71 } DOC_ITEM, *PDOC_ITEM;
  72
  73 typedef struct
  74 {
  75     HWND      Self;         /* The window handle for this control */
  76     HWND      Notify;       /* The parent handle to receive notifications */
  77     DWORD     Style;        /* Styles for this control */
  78     struct list Items;      /* Document items list */
  79     BOOL      HasFocus;     /* Whether the control has the input focus */
  80     int       MouseDownID;  /* ID of the link that the mouse button first selected */
  81     HFONT     Font;         /* Handle to the font for text */
  82     HFONT     LinkFont;     /* Handle to the font for links */
  83     COLORREF  TextColor;    /* Color of the text */
  84     COLORREF  LinkColor;    /* Color of links */
  85     COLORREF  VisitedColor; /* Color of visited links */
  86     WCHAR     BreakChar;    /* Break Character for the current font */
  87     BOOL      IgnoreReturn; /* (infoPtr->Style & LWS_IGNORERETURN) on creation */
  88 } SYSLINK_INFO;
  89
  90 /* Control configuration constants */
  91
  92 #define SL_LEFTMARGIN   (0)
  93 #define SL_TOPMARGIN    (0)
  94 #define SL_RIGHTMARGIN  (0)
  95 #define SL_BOTTOMMARGIN (0)
  96
  97 /***********************************************************************
  98  * SYSLINK_FreeDocItem
  99  * Frees all data and gdi objects associated with a document item
 100  */
 101 static VOID SYSLINK_FreeDocItem (PDOC_ITEM DocItem)
 102 {
 103     if(DocItem->Type == slLink)
 104     {
 105         Free(DocItem->u.Link.szID);
 106         Free(DocItem->u.Link.szUrl);
 107     }
 108
 109     Free(DocItem->Blocks);
 110
 111     /* we don't free Text because it's just a pointer to a character in the
 112        entire window text string */
 113
 114     Free(DocItem);
 115 }
 116
 117 /***********************************************************************
 118  * SYSLINK_AppendDocItem
 119  * Create and append a new document item.
 120  */
 121 static PDOC_ITEM SYSLINK_AppendDocItem (SYSLINK_INFO *infoPtr, LPCWSTR Text, UINT textlen,
 122                                         SL_ITEM_TYPE type, PDOC_ITEM LastItem)
 123 {
 124     PDOC_ITEM Item;
 125
 126     textlen = min(textlen, lstrlenW(Text));
 127     Item = Alloc(FIELD_OFFSET(DOC_ITEM, Text[textlen + 1]));
 128     if(Item == NULL)
 129     {
 130         ERR("Failed to alloc DOC_ITEM structure!\n");
 131         return NULL;
 132     }
 133
 134     Item->nText = textlen;
 135     Item->Type = type;
 136     Item->Blocks = NULL;
 137     lstrcpynW(Item->Text, Text, textlen + 1);
 138     if (LastItem)
 139         list_add_after(&LastItem->entry, &Item->entry);
 140     else
 141         list_add_tail(&infoPtr->Items, &Item->entry);
 142
 143     return Item;
 144 }
 145
 146 /***********************************************************************
 147  * SYSLINK_ClearDoc
 148  * Clears the document tree
 149  */
 150 static VOID SYSLINK_ClearDoc (SYSLINK_INFO *infoPtr)
 151 {
 152     DOC_ITEM *Item, *Item2;
 153
 154     LIST_FOR_EACH_ENTRY_SAFE(Item, Item2, &infoPtr->Items, DOC_ITEM, entry)
 155     {
 156         list_remove(&Item->entry);
 157         SYSLINK_FreeDocItem(Item);
 158     }
 159 }
 160
 161 /***********************************************************************
 162  * SYSLINK_ParseText
 163  * Parses the window text string and creates a document. Returns the
 164  * number of document items created.
 165  */
 166 static UINT SYSLINK_ParseText (SYSLINK_INFO *infoPtr, LPCWSTR Text)
 167 {
 168     LPCWSTR current, textstart = NULL, linktext = NULL, firsttag = NULL;
 169     int taglen = 0, textlen = 0, linklen = 0, docitems = 0;
 170     PDOC_ITEM Last = NULL;
 171     SL_ITEM_TYPE CurrentType = slText;
 172     LPCWSTR lpID, lpUrl;
 173     UINT lenId, lenUrl;
 174
 175     TRACE("(%p %s)\n", infoPtr, debugstr_w(Text));
 176
 177     for(current = Text; *current != 0;)
 178     {
 179         if(*current == '<')
 180         {
 181             if(!wcsnicmp(current, L"<a", 2) && (CurrentType == slText))
 182             {
 183                 BOOL ValidParam = FALSE, ValidLink = FALSE;
 184
 185                 if(*(current + 2) == '>')
 186                 {
 187                     /* we just have to deal with a <a> tag */
 188                     taglen = 3;
 189                     ValidLink = TRUE;
 190                     ValidParam = TRUE;
 191                     firsttag = current;
 192                     linklen = 0;
 193                     lpID = NULL;
 194                     lpUrl = NULL;
 195                 }
 196                 else if(*(current + 2) == infoPtr->BreakChar)
 197                 {
 198                     /* we expect parameters, parse them */
 199                     LPCWSTR *CurrentParameter = NULL, tmp;
 200                     UINT *CurrentParameterLen = NULL;
 201
 202                     taglen = 3;
 203                     tmp = current + taglen;
 204                     lpID = NULL;
 205                     lpUrl = NULL;
 206
 207 CheckParameter:
 208                     /* compare the current position with all known parameters */
 209                     if(!wcsnicmp(tmp, L"href=\"", 6))
 210                     {
 211                         taglen += 6;
 212                         ValidParam = TRUE;
 213                         CurrentParameter = &lpUrl;
 214                         CurrentParameterLen = &lenUrl;
 215                     }
 216                     else if(!wcsnicmp(tmp, L"id=\"", 4))
 217                     {
 218                         taglen += 4;
 219                         ValidParam = TRUE;
 220                         CurrentParameter = &lpID;
 221                         CurrentParameterLen = &lenId;
 222                     }
 223                     else
 224                     {
 225                         ValidParam = FALSE;
 226                     }
 227
 228                     if(ValidParam)
 229                     {
 230                         /* we got a known parameter, now search until the next " character.
 231                            If we can't find a " character, there's a syntax error and we just assume it's text */
 232                         ValidParam = FALSE;
 233                         *CurrentParameter = current + taglen;
 234                         *CurrentParameterLen = 0;
 235
 236                         for(tmp = *CurrentParameter; *tmp != 0; tmp++)
 237                         {
 238                             taglen++;
 239                             if(*tmp == '\"')
 240                             {
 241                                 ValidParam = TRUE;
 242                                 tmp++;
 243                                 break;
 244                             }
 245                             (*CurrentParameterLen)++;
 246                         }
 247                     }
 248                     if(ValidParam)
 249                     {
 250                         /* we're done with this parameter, now there are only 2 possibilities:
 251                          * 1. another parameter is coming, so expect a ' ' (space) character
 252                          * 2. the tag is being closed, so expect a '<' character
 253                          */
 254                         if(*tmp == infoPtr->BreakChar)
 255                         {
 256                             /* we expect another parameter, do the whole thing again */
 257                             taglen++;
 258                             tmp++;
 259                             goto CheckParameter;
 260                         }
 261                         else if(*tmp == '>')
 262                         {
 263                             /* the tag is being closed, we're done */
 264                             ValidLink = TRUE;
 265                             taglen++;
 266                         }
 267                     }
 268                 }
 269
 270                 if(ValidLink && ValidParam)
 271                 {
 272                     /* the <a ...> tag appears to be valid. save all information
 273                        so we can add the link if we find a valid </a> tag later */
 274                     CurrentType = slLink;
 275                     linktext = current + taglen;
 276                     linklen = 0;
 277                     firsttag = current;
 278                 }
 279                 else
 280                 {
 281                     taglen = 1;
 282                     lpID = NULL;
 283                     lpUrl = NULL;
 284                     if(textstart == NULL)
 285                     {
 286                         textstart = current;
 287                     }
 288                 }
 289             }
 290             else if (!wcsnicmp(current, L"</a>", 4) && (CurrentType == slLink) && firsttag)
 291             {
 292                 /* there's a <a...> tag opened, first add the previous text, if present */
 293                 if(textstart != NULL && textlen > 0 && firsttag > textstart)
 294                 {
 295                     Last = SYSLINK_AppendDocItem(infoPtr, textstart, firsttag - textstart, slText, Last);
 296                     if(Last == NULL)
 297                     {
 298                         ERR("Unable to create new document item!\n");
 299                         return docitems;
 300                     }
 301                     docitems++;
 302                     textstart = NULL;
 303                     textlen = 0;
 304                 }
 305
 306                 /* now it's time to add the link to the document */
 307                 current += 4;
 308                 if(linktext != NULL && linklen > 0)
 309                 {
 310                     Last = SYSLINK_AppendDocItem(infoPtr, linktext, linklen, slLink, Last);
 311                     if(Last == NULL)
 312                     {
 313                         ERR("Unable to create new document item!\n");
 314                         return docitems;
 315                     }
 316                     docitems++;
 317                     if(CurrentType == slLink)
 318                     {
 319                         int nc;
 320
 321                         if(!(infoPtr->Style & WS_DISABLED))
 322                         {
 323                             Last->u.Link.state |= LIS_ENABLED;
 324                         }
 325                         /* Copy the tag parameters */
 326                         if(lpID != NULL)
 327                         {
 328                             nc = min(lenId, lstrlenW(lpID));
 329                             nc = min(nc, MAX_LINKID_TEXT - 1);
 330                             Last->u.Link.szID = Alloc((nc + 1) * sizeof(WCHAR));
 331                             if(Last->u.Link.szID != NULL)
 332                             {
 333                                 lstrcpynW(Last->u.Link.szID, lpID, nc + 1);
 334                             }
 335                         }
 336                         else
 337                             Last->u.Link.szID = NULL;
 338                         if(lpUrl != NULL)
 339                         {
 340                             nc = min(lenUrl, lstrlenW(lpUrl));
 341                             nc = min(nc, L_MAX_URL_LENGTH - 1);
 342                             Last->u.Link.szUrl = Alloc((nc + 1) * sizeof(WCHAR));
 343                             if(Last->u.Link.szUrl != NULL)
 344                             {
 345                                 lstrcpynW(Last->u.Link.szUrl, lpUrl, nc + 1);
 346                             }
 347                         }
 348                         else
 349                             Last->u.Link.szUrl = NULL;
 350                     }
 351                     linktext = NULL;
 352                 }
 353                 CurrentType = slText;
 354                 firsttag = NULL;
 355                 textstart = NULL;
 356                 continue;
 357             }
 358             else
 359             {
 360                 /* we don't know what tag it is, so just continue */
 361                 taglen = 1;
 362                 linklen++;
 363                 if(CurrentType == slText && textstart == NULL)
 364                 {
 365                     textstart = current;
 366                 }
 367             }
 368
 369             textlen += taglen;
 370             current += taglen;
 371         }
 372         else
 373         {
 374             textlen++;
 375             linklen++;
 376
 377             /* save the pointer of the current text item if we couldn't find a tag */
 378             if(textstart == NULL && CurrentType == slText)
 379             {
 380                 textstart = current;
 381             }
 382
 383             current++;
 384         }
 385     }
 386
 387     if(textstart != NULL && textlen > 0)
 388     {
 389         Last = SYSLINK_AppendDocItem(infoPtr, textstart, textlen, CurrentType, Last);
 390         if(Last == NULL)
 391         {
 392             ERR("Unable to create new document item!\n");
 393             return docitems;
 394         }
 395         if(CurrentType == slLink)
 396         {
 397             int nc;
 398
 399             if(!(infoPtr->Style & WS_DISABLED))
 400             {
 401                 Last->u.Link.state |= LIS_ENABLED;
 402             }
 403             /* Copy the tag parameters */
 404             if(lpID != NULL)
 405             {
 406                 nc = min(lenId, lstrlenW(lpID));
 407                 nc = min(nc, MAX_LINKID_TEXT - 1);
 408                 Last->u.Link.szID = Alloc((nc + 1) * sizeof(WCHAR));
 409                 if(Last->u.Link.szID != NULL)
 410                 {
 411                     lstrcpynW(Last->u.Link.szID, lpID, nc + 1);
 412                 }
 413             }
 414             else
 415                 Last->u.Link.szID = NULL;
 416             if(lpUrl != NULL)
 417             {
 418                 nc = min(lenUrl, lstrlenW(lpUrl));
 419                 nc = min(nc, L_MAX_URL_LENGTH - 1);
 420                 Last->u.Link.szUrl = Alloc((nc + 1) * sizeof(WCHAR));
 421                 if(Last->u.Link.szUrl != NULL)
 422                 {
 423                     lstrcpynW(Last->u.Link.szUrl, lpUrl, nc + 1);
 424                 }
 425             }
 426             else
 427                 Last->u.Link.szUrl = NULL;
 428         }
 429         docitems++;
 430     }
 431
 432     if(linktext != NULL && linklen > 0)
 433     {
 434         /* we got an unclosed link, just display the text */
 435         Last = SYSLINK_AppendDocItem(infoPtr, linktext, linklen, slText, Last);
 436         if(Last == NULL)
 437         {
 438             ERR("Unable to create new document item!\n");
 439             return docitems;
 440         }
 441         docitems++;
 442     }
 443
 444     return docitems;
 445 }
 446
 447 /***********************************************************************
 448  * SYSLINK_RepaintLink
 449  * Repaints a link.
 450  */
 451 static VOID SYSLINK_RepaintLink (const SYSLINK_INFO *infoPtr, const DOC_ITEM *DocItem)
 452 {
 453     PDOC_TEXTBLOCK bl;
 454     int n;
 455
 456     if(DocItem->Type != slLink)
 457     {
 458         ERR("DocItem not a link!\n");
 459         return;
 460     }
 461
 462     bl = DocItem->Blocks;
 463     if (bl != NULL)
 464     {
 465         n = DocItem->nText;
 466
 467         while(n > 0)
 468         {
 469             InvalidateRect(infoPtr->Self, &bl->rc, TRUE);
 470             n -= bl->nChars + bl->nSkip;
 471             bl++;
 472         }
 473     }
 474 }
 475
 476 /***********************************************************************
 477  * SYSLINK_GetLinkItemByIndex
 478  * Retrieves a document link by its index
 479  */
 480 static PDOC_ITEM SYSLINK_GetLinkItemByIndex (const SYSLINK_INFO *infoPtr, int iLink)
 481 {
 482     DOC_ITEM *Current;
 483
 484     LIST_FOR_EACH_ENTRY(Current, &infoPtr->Items, DOC_ITEM, entry)
 485     {
 486         if ((Current->Type == slLink) && (iLink-- <= 0))
 487             return Current;
 488     }
 489     return NULL;
 490 }
 491
 492 /***********************************************************************
 493  * SYSLINK_GetFocusLink
 494  * Retrieves the link that has the LIS_FOCUSED bit
 495  */
 496 static PDOC_ITEM SYSLINK_GetFocusLink (const SYSLINK_INFO *infoPtr, int *LinkId)
 497 {
 498     DOC_ITEM *Current;
 499     int id = 0;
 500
 501     LIST_FOR_EACH_ENTRY(Current, &infoPtr->Items, DOC_ITEM, entry)
 502     {
 503         if(Current->Type == slLink)
 504         {
 505             if(Current->u.Link.state & LIS_FOCUSED)
 506             {
 507                 if(LinkId != NULL)
 508                     *LinkId = id;
 509                 return Current;
 510             }
 511             id++;
 512         }
 513     }
 514
 515     return NULL;
 516 }
 517
 518 /***********************************************************************
 519  * SYSLINK_GetNextLink
 520  * Gets the next link
 521  */
 522 static PDOC_ITEM SYSLINK_GetNextLink (const SYSLINK_INFO *infoPtr, PDOC_ITEM Current)
 523 {
 524     DOC_ITEM *Next;
 525
 526     LIST_FOR_EACH_ENTRY(Next, Current ? &Current->entry : &infoPtr->Items, DOC_ITEM, entry)
 527     {
 528         if (Next->Type == slLink)
 529         {
 530             return Next;
 531         }
 532     }
 533     return NULL;
 534 }
 535
 536 /***********************************************************************
 537  * SYSLINK_GetPrevLink
 538  * Gets the previous link
 539  */
 540 static PDOC_ITEM SYSLINK_GetPrevLink (const SYSLINK_INFO *infoPtr, PDOC_ITEM Current)
 541 {
 542     DOC_ITEM *Prev;
 543
 544     LIST_FOR_EACH_ENTRY_REV(Prev, Current ? &Current->entry : list_tail(&infoPtr->Items), DOC_ITEM, entry)
 545     {
 546         if (Prev->Type == slLink)
 547         {
 548             return Prev;
 549         }
 550     }
 551
 552     return NULL;
 553 }
 554
 555 /***********************************************************************
 556  * SYSLINK_WrapLine
 557  * Tries to wrap a line.
 558  */
 559 static BOOL SYSLINK_WrapLine (LPWSTR Text, WCHAR BreakChar, int x, int *LineLen,
 560                              int nFit, LPSIZE Extent)
 561 {
 562     int i;
 563
 564     for (i = 0; i < nFit; i++) if (Text[i] == '\r' || Text[i] == '\n') break;
 565
 566     if (i == *LineLen) return FALSE;
 567
 568     /* check if we're in the middle of a word */
 569     if (Text[i] != '\r' && Text[i] != '\n' && Text[i] != BreakChar)
 570     {
 571         /* search for the beginning of the word */
 572         while (i && Text[i - 1] != BreakChar) i--;
 573
 574         if (i == 0)
 575         {
 576             Extent->cx = 0;
 577             Extent->cy = 0;
 578             if (x == SL_LEFTMARGIN) i = max( nFit, 1 );
 579         }
 580     }
 581     *LineLen = i;
 582     return TRUE;
 583 }
 584
 585 /***********************************************************************
 586  * SYSLINK_Render
 587  * Renders the document in memory
 588  */
 589 static VOID SYSLINK_Render (const SYSLINK_INFO *infoPtr, HDC hdc, PRECT pRect)
 590 {
 591     RECT rc;
 592     PDOC_ITEM Current;
 593     HGDIOBJ hOldFont;
 594     int x, y, LineHeight;
 595     SIZE szDoc;
 596     TEXTMETRICW tm;
 597
 598     szDoc.cx = szDoc.cy = 0;
 599
 600     rc = *pRect;
 601     rc.right -= SL_RIGHTMARGIN;
 602     rc.bottom -= SL_BOTTOMMARGIN;
 603
 604     if(rc.right - SL_LEFTMARGIN < 0)
 605         rc.right = MAXLONG;
 606     if (rc.bottom - SL_TOPMARGIN < 0)
 607         rc.bottom = MAXLONG;
 608
 609     hOldFont = SelectObject(hdc, infoPtr->Font);
 610
 611     x = SL_LEFTMARGIN;
 612     y = SL_TOPMARGIN;
 613     GetTextMetricsW( hdc, &tm );
 614     LineHeight = tm.tmHeight + tm.tmExternalLeading;
 615
 616     LIST_FOR_EACH_ENTRY(Current, &infoPtr->Items, DOC_ITEM, entry)
 617     {
 618         int n, nBlocks;
 619         LPWSTR tx;
 620         PDOC_TEXTBLOCK bl, cbl;
 621         INT nFit;
 622         SIZE szDim;
 623         int SkipChars = 0;
 624
 625         if(Current->nText == 0)
 626         {
 627             continue;
 628         }
 629
 630         tx = Current->Text;
 631         n = Current->nText;
 632
 633         Free(Current->Blocks);
 634         Current->Blocks = NULL;
 635         bl = NULL;
 636         nBlocks = 0;
 637
 638         if(Current->Type == slText)
 639         {
 640             SelectObject(hdc, infoPtr->Font);
 641         }
 642         else if(Current->Type == slLink)
 643         {
 644             SelectObject(hdc, infoPtr->LinkFont);
 645         }
 646
 647         while(n > 0)
 648         {
 649             /* skip break characters unless they're the first of the doc item */
 650             if(tx != Current->Text || x == SL_LEFTMARGIN)
 651             {
 652                 if (n && *tx == '\r')
 653                 {
 654                     tx++;
 655                     SkipChars++;
 656                     n--;
 657                 }
 658                 if (n && *tx == '\n')
 659                 {
 660                     tx++;
 661                     SkipChars++;
 662                     n--;
 663                 }
 664                 while(n > 0 && (*tx) == infoPtr->BreakChar)
 665                 {
 666                     tx++;
 667                     SkipChars++;
 668                     n--;
 669                 }
 670             }
 671
 672             if((n == 0 && SkipChars != 0) ||
 673                GetTextExtentExPointW(hdc, tx, n, rc.right - x, &nFit, NULL, &szDim))
 674             {
 675                 int LineLen = n;
 676                 BOOL Wrap = FALSE;
 677                 PDOC_TEXTBLOCK nbl;
 678
 679                 if(n != 0)
 680                 {
 681                     Wrap = SYSLINK_WrapLine(tx, infoPtr->BreakChar, x, &LineLen, nFit, &szDim);
 682
 683                     if(LineLen == 0)
 684                     {
 685                         /* move one line down, the word didn't fit into the line */
 686                         x = SL_LEFTMARGIN;
 687                         y += LineHeight;
 688                         continue;
 689                     }
 690
 691                     if(LineLen != n)
 692                     {
 693                         if(!GetTextExtentExPointW(hdc, tx, LineLen, rc.right - x, NULL, NULL, &szDim))
 694                         {
 695                             if(bl != NULL)
 696                             {
 697                                 Free(bl);
 698                                 bl = NULL;
 699                                 nBlocks = 0;
 700                             }
 701                             break;
 702                         }
 703                     }
 704                 }
 705
 706                 nbl = ReAlloc(bl, (nBlocks + 1) * sizeof(DOC_TEXTBLOCK));
 707                 if (nbl != NULL)
 708                 {
 709                     bl = nbl;
 710                     nBlocks++;
 711
 712                     cbl = bl + nBlocks - 1;
 713
 714                     cbl->nChars = LineLen;
 715                     cbl->nSkip = SkipChars;
 716                     SetRect(&cbl->rc, x, y, x + szDim.cx, y + szDim.cy);
 717
 718                     if (cbl->rc.right > szDoc.cx)
 719                         szDoc.cx = cbl->rc.right;
 720                     if (cbl->rc.bottom > szDoc.cy)
 721                         szDoc.cy = cbl->rc.bottom;
 722
 723                     if(LineLen != 0)
 724                     {
 725                         x += szDim.cx;
 726                         if(Wrap)
 727                         {
 728                             x = SL_LEFTMARGIN;
 729                             y += LineHeight;
 730                         }
 731                     }
 732                 }
 733                 else
 734                 {
 735                     Free(bl);
 736                     bl = NULL;
 737                     nBlocks = 0;
 738
 739                     ERR("Failed to alloc DOC_TEXTBLOCK structure!\n");
 740                     break;
 741                 }
 742                 n -= LineLen;
 743                 tx += LineLen;
 744                 SkipChars = 0;
 745             }
 746             else
 747             {
 748                 n--;
 749             }
 750         }
 751
 752         if(nBlocks != 0)
 753         {
 754             Current->Blocks = bl;
 755         }
 756     }
 757
 758     SelectObject(hdc, hOldFont);
 759
 760     pRect->right = pRect->left + szDoc.cx;
 761     pRect->bottom = pRect->top + szDoc.cy;
 762 }
 763
 764 /***********************************************************************
 765  * SYSLINK_Draw
 766  * Draws the SysLink control.
 767  */
 768 static LRESULT SYSLINK_Draw (const SYSLINK_INFO *infoPtr, HDC hdc)
 769 {
 770     RECT rc;
 771     PDOC_ITEM Current;
 772     HFONT hOldFont;
 773     COLORREF OldTextColor, OldBkColor;
 774     HBRUSH hBrush;
 775     UINT text_flags = ETO_CLIPPED;
 776     UINT mode = GetBkMode( hdc );
 777
 778     hOldFont = SelectObject(hdc, infoPtr->Font);
 779     OldTextColor = SetTextColor(hdc, infoPtr->TextColor);
 780     OldBkColor = SetBkColor(hdc, comctl32_color.clrWindow);
 781
 782     GetClientRect(infoPtr->Self, &rc);
 783     rc.right -= SL_RIGHTMARGIN + SL_LEFTMARGIN;
 784     rc.bottom -= SL_BOTTOMMARGIN + SL_TOPMARGIN;
 785
 786     if(rc.right < 0 || rc.bottom < 0) return 0;
 787
 788     hBrush = (HBRUSH)SendMessageW(infoPtr->Notify, WM_CTLCOLORSTATIC,
 789                                   (WPARAM)hdc, (LPARAM)infoPtr->Self);
 790     if (!(infoPtr->Style & LWS_TRANSPARENT))
 791     {
 792         FillRect(hdc, &rc, hBrush);
 793         if (GetBkMode( hdc ) == OPAQUE) text_flags |= ETO_OPAQUE;
 794     }
 795     else SetBkMode( hdc, TRANSPARENT );
 796
 797     DeleteObject(hBrush);
 798
 799     LIST_FOR_EACH_ENTRY(Current, &infoPtr->Items, DOC_ITEM, entry)
 800     {
 801         int n;
 802         LPWSTR tx;
 803         PDOC_TEXTBLOCK bl;
 804
 805         bl = Current->Blocks;
 806         if(bl != NULL)
 807         {
 808             tx = Current->Text;
 809             n = Current->nText;
 810
 811             if(Current->Type == slText)
 812             {
 813                  SelectObject(hdc, infoPtr->Font);
 814                  SetTextColor(hdc, infoPtr->TextColor);
 815             }
 816             else
 817             {
 818                  SelectObject(hdc, infoPtr->LinkFont);
 819                  SetTextColor(hdc, (!(Current->u.Link.state & LIS_VISITED) ? infoPtr->LinkColor : infoPtr->VisitedColor));
 820             }
 821
 822             while(n > 0)
 823             {
 824                 tx += bl->nSkip;
 825                 ExtTextOutW(hdc, bl->rc.left, bl->rc.top, text_flags, &bl->rc, tx, bl->nChars, NULL);
 826                 if((Current->Type == slLink) && (Current->u.Link.state & LIS_FOCUSED) && infoPtr->HasFocus)
 827                 {
 828                     COLORREF PrevTextColor;
 829                     PrevTextColor = SetTextColor(hdc, infoPtr->TextColor);
 830                     DrawFocusRect(hdc, &bl->rc);
 831                     SetTextColor(hdc, PrevTextColor);
 832                 }
 833                 tx += bl->nChars;
 834                 n -= bl->nChars + bl->nSkip;
 835                 bl++;
 836             }
 837         }
 838     }
 839
 840     SetBkColor(hdc, OldBkColor);
 841     SetTextColor(hdc, OldTextColor);
 842     SelectObject(hdc, hOldFont);
 843     SetBkMode(hdc, mode);
 844     return 0;
 845 }
 846
 847
 848 /***********************************************************************
 849  * SYSLINK_Paint
 850  * Handles the WM_PAINT message.
 851  */
 852 static LRESULT SYSLINK_Paint (const SYSLINK_INFO *infoPtr, HDC hdcParam)
 853 {
 854     HDC hdc;
 855     PAINTSTRUCT ps;
 856
 857     hdc = hdcParam ? hdcParam : BeginPaint (infoPtr->Self, &ps);
 858     if (hdc)
 859     {
 860         SYSLINK_Draw (infoPtr, hdc);
 861         if (!hdcParam) EndPaint (infoPtr->Self, &ps);
 862     }
 863     return 0;
 864 }
 865
 866 /***********************************************************************
 867  *           SYSLINK_SetFont
 868  * Set new Font for the SysLink control.
 869  */
 870 static HFONT SYSLINK_SetFont (SYSLINK_INFO *infoPtr, HFONT hFont, BOOL bRedraw)
 871 {
 872     HDC hdc;
 873     LOGFONTW lf;
 874     TEXTMETRICW tm;
 875     RECT rcClient;
 876     HFONT hOldFont = infoPtr->Font;
 877     infoPtr->Font = hFont;
 878
 879     /* free the underline font */
 880     if(infoPtr->LinkFont != NULL)
 881     {
 882         DeleteObject(infoPtr->LinkFont);
 883         infoPtr->LinkFont = NULL;
 884     }
 885
 886     /* Render text position and word wrapping in memory */
 887     if (GetClientRect(infoPtr->Self, &rcClient))
 888     {
 889         hdc = GetDC(infoPtr->Self);
 890         if(hdc != NULL)
 891         {
 892             /* create a new underline font */
 893             if(GetTextMetricsW(hdc, &tm) &&
 894                GetObjectW(infoPtr->Font, sizeof(LOGFONTW), &lf))
 895             {
 896                 lf.lfUnderline = TRUE;
 897                 infoPtr->LinkFont = CreateFontIndirectW(&lf);
 898                 infoPtr->BreakChar = tm.tmBreakChar;
 899             }
 900             else
 901             {
 902                 ERR("Failed to create link font!\n");
 903             }
 904
 905             SYSLINK_Render(infoPtr, hdc, &rcClient);
 906             ReleaseDC(infoPtr->Self, hdc);
 907         }
 908     }
 909
 910     if(bRedraw)
 911     {
 912         RedrawWindow(infoPtr->Self, NULL, NULL, RDW_INVALIDATE | RDW_UPDATENOW);
 913     }
 914
 915     return hOldFont;
 916 }
 917
 918 /***********************************************************************
 919  *           SYSLINK_SetText
 920  * Set new text for the SysLink control.
 921  */
 922 static LRESULT SYSLINK_SetText (SYSLINK_INFO *infoPtr, LPCWSTR Text)
 923 {
 924     /* clear the document */
 925     SYSLINK_ClearDoc(infoPtr);
 926
 927     if(Text == NULL || *Text == 0)
 928     {
 929         return TRUE;
 930     }
 931
 932     /* let's parse the string and create a document */
 933     if(SYSLINK_ParseText(infoPtr, Text) > 0)
 934     {
 935         RECT rcClient;
 936
 937         /* Render text position and word wrapping in memory */
 938         if (GetClientRect(infoPtr->Self, &rcClient))
 939         {
 940             HDC hdc = GetDC(infoPtr->Self);
 941             if (hdc != NULL)
 942             {
 943                 SYSLINK_Render(infoPtr, hdc, &rcClient);
 944                 ReleaseDC(infoPtr->Self, hdc);
 945
 946                 InvalidateRect(infoPtr->Self, NULL, TRUE);
 947             }
 948         }
 949     }
 950
 951     return TRUE;
 952 }
 953
 954 /***********************************************************************
 955  *           SYSLINK_SetFocusLink
 956  * Updates the focus status bits and focuses the specified link.
 957  * If no document item is specified, the focus bit will be removed from all links.
 958  * Returns the previous focused item.
 959  */
 960 static PDOC_ITEM SYSLINK_SetFocusLink (const SYSLINK_INFO *infoPtr, const DOC_ITEM *DocItem)
 961 {
 962     PDOC_ITEM Current, PrevFocus = NULL;
 963
 964     LIST_FOR_EACH_ENTRY(Current, &infoPtr->Items, DOC_ITEM, entry)
 965     {
 966         if(Current->Type == slLink)
 967         {
 968             if((PrevFocus == NULL) && (Current->u.Link.state & LIS_FOCUSED))
 969             {
 970                 PrevFocus = Current;
 971             }
 972
 973             if(Current == DocItem)
 974             {
 975                 Current->u.Link.state |= LIS_FOCUSED;
 976             }
 977             else
 978             {
 979                 Current->u.Link.state &= ~LIS_FOCUSED;
 980             }
 981         }
 982     }
 983
 984     return PrevFocus;
 985 }
 986
 987 /***********************************************************************
 988  *           SYSLINK_SetItem
 989  * Sets the states and attributes of a link item.
 990  */
 991 static LRESULT SYSLINK_SetItem (const SYSLINK_INFO *infoPtr, const LITEM *Item)
 992 {
 993     PDOC_ITEM di;
 994     int nc;
 995     PWSTR szId = NULL;
 996     PWSTR szUrl = NULL;
 997     BOOL Repaint = FALSE;
 998
 999     if(!(Item->mask & LIF_ITEMINDEX) || !(Item->mask & (LIF_FLAGSMASK)))
1000     {
1001         ERR("Invalid Flags!\n");
1002         return FALSE;
1003     }
1004
1005     di = SYSLINK_GetLinkItemByIndex(infoPtr, Item->iLink);
1006     if(di == NULL)
1007     {
1008         ERR("Link %d couldn't be found\n", Item->iLink);
1009         return FALSE;
1010     }
1011
1012     if(Item->mask & LIF_ITEMID)
1013     {
1014         nc = min(lstrlenW(Item->szID), MAX_LINKID_TEXT - 1);
1015         szId = Alloc((nc + 1) * sizeof(WCHAR));
1016         if(szId)
1017         {
1018             lstrcpynW(szId, Item->szID, nc + 1);
1019         }
1020         else
1021         {
1022             ERR("Unable to allocate memory for link id\n");
1023             return FALSE;
1024         }
1025     }
1026
1027     if(Item->mask & LIF_URL)
1028     {
1029         nc = min(lstrlenW(Item->szUrl), L_MAX_URL_LENGTH - 1);
1030         szUrl = Alloc((nc + 1) * sizeof(WCHAR));
1031         if(szUrl)
1032         {
1033             lstrcpynW(szUrl, Item->szUrl, nc + 1);
1034         }
1035         else
1036         {
1037             Free(szId);
1038
1039             ERR("Unable to allocate memory for link url\n");
1040             return FALSE;
1041         }
1042     }
1043
1044     if(Item->mask & LIF_ITEMID)
1045     {
1046         Free(di->u.Link.szID);
1047         di->u.Link.szID = szId;
1048     }
1049
1050     if(Item->mask & LIF_URL)
1051     {
1052         Free(di->u.Link.szUrl);
1053         di->u.Link.szUrl = szUrl;
1054     }
1055
1056     if(Item->mask & LIF_STATE)
1057     {
1058         UINT oldstate = di->u.Link.state;
1059         /* clear the masked bits */
1060         di->u.Link.state &= ~(Item->stateMask & LIS_MASK);
1061         /* copy the bits */
1062         di->u.Link.state |= (Item->state & Item->stateMask) & LIS_MASK;
1063         Repaint = (oldstate != di->u.Link.state);
1064
1065         /* update the focus */
1066         SYSLINK_SetFocusLink(infoPtr, ((di->u.Link.state & LIS_FOCUSED) ? di : NULL));
1067     }
1068
1069     if(Repaint)
1070     {
1071         SYSLINK_RepaintLink(infoPtr, di);
1072     }
1073
1074     return TRUE;
1075 }
1076
1077 /***********************************************************************
1078  *           SYSLINK_GetItem
1079  * Retrieves the states and attributes of a link item.
1080  */
1081 static LRESULT SYSLINK_GetItem (const 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             lstrcpyW(Item->szID, di->u.Link.szID);
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             lstrcpyW(Item->szUrl, di->u.Link.szUrl);
1125         }
1126         else
1127         {
1128             Item->szUrl[0] = 0;
1129         }
1130     }
1131
1132     return TRUE;
1133 }
1134
1135 /***********************************************************************
1136  *           SYSLINK_PtInDocItem
1137  * Determines if a point is in the region of a document item
1138  */
1139 static BOOL SYSLINK_PtInDocItem (const DOC_ITEM *DocItem, POINT pt)
1140 {
1141     PDOC_TEXTBLOCK bl;
1142     int n;
1143
1144     bl = DocItem->Blocks;
1145     if (bl != NULL)
1146     {
1147         n = DocItem->nText;
1148
1149         while(n > 0)
1150         {
1151             if (PtInRect(&bl->rc, pt))
1152             {
1153                 return TRUE;
1154             }
1155             n -= bl->nChars + bl->nSkip;
1156             bl++;
1157         }
1158     }
1159
1160     return FALSE;
1161 }
1162
1163 /***********************************************************************
1164  *           SYSLINK_HitTest
1165  * Determines the link the user clicked on.
1166  */
1167 static LRESULT SYSLINK_HitTest (const SYSLINK_INFO *infoPtr, PLHITTESTINFO HitTest)
1168 {
1169     PDOC_ITEM Current;
1170     int id = 0;
1171
1172     LIST_FOR_EACH_ENTRY(Current, &infoPtr->Items, DOC_ITEM, entry)
1173     {
1174         if(Current->Type == slLink)
1175         {
1176             if(SYSLINK_PtInDocItem(Current, HitTest->pt))
1177             {
1178                 HitTest->item.mask = 0;
1179                 HitTest->item.iLink = id;
1180                 HitTest->item.state = 0;
1181                 HitTest->item.stateMask = 0;
1182                 if(Current->u.Link.szID)
1183                 {
1184                     lstrcpyW(HitTest->item.szID, Current->u.Link.szID);
1185                 }
1186                 else
1187                 {
1188                     HitTest->item.szID[0] = 0;
1189                 }
1190                 if(Current->u.Link.szUrl)
1191                 {
1192                     lstrcpyW(HitTest->item.szUrl, Current->u.Link.szUrl);
1193                 }
1194                 else
1195                 {
1196                     HitTest->item.szUrl[0] = 0;
1197                 }
1198                 return TRUE;
1199             }
1200             id++;
1201         }
1202     }
1203
1204     return FALSE;
1205 }
1206
1207 /***********************************************************************
1208  *           SYSLINK_GetIdealHeight
1209  * Returns the preferred height of a link at the current control's width.
1210  */
1211 static LRESULT SYSLINK_GetIdealHeight (const SYSLINK_INFO *infoPtr)
1212 {
1213     HDC hdc = GetDC(infoPtr->Self);
1214     if(hdc != NULL)
1215     {
1216         LRESULT height;
1217         TEXTMETRICW tm;
1218         HGDIOBJ hOldFont = SelectObject(hdc, infoPtr->Font);
1219
1220         if(GetTextMetricsW(hdc, &tm))
1221         {
1222             height = tm.tmHeight;
1223         }
1224         else
1225         {
1226             height = 0;
1227         }
1228         SelectObject(hdc, hOldFont);
1229         ReleaseDC(infoPtr->Self, hdc);
1230
1231         return height;
1232     }
1233     return 0;
1234 }
1235
1236 /***********************************************************************
1237  *           SYSLINK_SendParentNotify
1238  * Sends a WM_NOTIFY message to the parent window.
1239  */
1240 static LRESULT SYSLINK_SendParentNotify (const SYSLINK_INFO *infoPtr, UINT code, const DOC_ITEM *Link, int iLink)
1241 {
1242     NMLINK nml;
1243
1244     nml.hdr.hwndFrom = infoPtr->Self;
1245     nml.hdr.idFrom = GetWindowLongPtrW(infoPtr->Self, GWLP_ID);
1246     nml.hdr.code = code;
1247
1248     nml.item.mask = 0;
1249     nml.item.iLink = iLink;
1250     nml.item.state = 0;
1251     nml.item.stateMask = 0;
1252     if(Link->u.Link.szID)
1253     {
1254         lstrcpyW(nml.item.szID, Link->u.Link.szID);
1255     }
1256     else
1257     {
1258         nml.item.szID[0] = 0;
1259     }
1260     if(Link->u.Link.szUrl)
1261     {
1262         lstrcpyW(nml.item.szUrl, Link->u.Link.szUrl);
1263     }
1264     else
1265     {
1266         nml.item.szUrl[0] = 0;
1267     }
1268
1269     return SendMessageW(infoPtr->Notify, WM_NOTIFY, nml.hdr.idFrom, (LPARAM)&nml);
1270 }
1271
1272 /***********************************************************************
1273  *           SYSLINK_SetFocus
1274  * Handles receiving the input focus.
1275  */
1276 static LRESULT SYSLINK_SetFocus (SYSLINK_INFO *infoPtr)
1277 {
1278     PDOC_ITEM Focus;
1279
1280     infoPtr->HasFocus = TRUE;
1281
1282     /* We always select the first link, even if we activated the control using
1283        SHIFT+TAB. This is the default behavior */
1284     Focus = SYSLINK_GetNextLink(infoPtr, NULL);
1285     if(Focus != NULL)
1286     {
1287         SYSLINK_SetFocusLink(infoPtr, Focus);
1288         SYSLINK_RepaintLink(infoPtr, Focus);
1289     }
1290     return 0;
1291 }
1292
1293 /***********************************************************************
1294  *           SYSLINK_KillFocus
1295  * Handles losing the input focus.
1296  */
1297 static LRESULT SYSLINK_KillFocus (SYSLINK_INFO *infoPtr)
1298 {
1299     PDOC_ITEM Focus;
1300
1301     infoPtr->HasFocus = FALSE;
1302     Focus = SYSLINK_GetFocusLink(infoPtr, NULL);
1303
1304     if(Focus != NULL)
1305     {
1306         SYSLINK_RepaintLink(infoPtr, Focus);
1307     }
1308
1309     return 0;
1310 }
1311
1312 /***********************************************************************
1313  *           SYSLINK_LinkAtPt
1314  * Returns a link at the specified position
1315  */
1316 static PDOC_ITEM SYSLINK_LinkAtPt (const SYSLINK_INFO *infoPtr, const POINT *pt, int *LinkId, BOOL MustBeEnabled)
1317 {
1318     PDOC_ITEM Current;
1319     int id = 0;
1320
1321     LIST_FOR_EACH_ENTRY(Current, &infoPtr->Items, DOC_ITEM, entry)
1322     {
1323         if((Current->Type == slLink) && SYSLINK_PtInDocItem(Current, *pt) &&
1324            (!MustBeEnabled || (Current->u.Link.state & LIS_ENABLED)))
1325         {
1326             if(LinkId != NULL)
1327             {
1328                 *LinkId = id;
1329             }
1330             return Current;
1331         }
1332         id++;
1333     }
1334
1335     return NULL;
1336 }
1337
1338 /***********************************************************************
1339  *           SYSLINK_LButtonDown
1340  * Handles mouse clicks
1341  */
1342 static LRESULT SYSLINK_LButtonDown (SYSLINK_INFO *infoPtr, const POINT *pt)
1343 {
1344     PDOC_ITEM Current, Old;
1345     int id;
1346
1347     Current = SYSLINK_LinkAtPt(infoPtr, pt, &id, TRUE);
1348     if(Current != NULL)
1349     {
1350       SetFocus(infoPtr->Self);
1351
1352       Old = SYSLINK_SetFocusLink(infoPtr, Current);
1353       if(Old != NULL && Old != Current)
1354       {
1355           SYSLINK_RepaintLink(infoPtr, Old);
1356       }
1357       infoPtr->MouseDownID = id;
1358       SYSLINK_RepaintLink(infoPtr, Current);
1359     }
1360
1361     return 0;
1362 }
1363
1364 /***********************************************************************
1365  *           SYSLINK_LButtonUp
1366  * Handles mouse clicks
1367  */
1368 static LRESULT SYSLINK_LButtonUp (SYSLINK_INFO *infoPtr, const POINT *pt)
1369 {
1370     if(infoPtr->MouseDownID > -1)
1371     {
1372         PDOC_ITEM Current;
1373         int id;
1374
1375         Current = SYSLINK_LinkAtPt(infoPtr, pt, &id, TRUE);
1376         if((Current != NULL) && (Current->u.Link.state & LIS_FOCUSED) && (infoPtr->MouseDownID == id))
1377         {
1378             SYSLINK_SendParentNotify(infoPtr, NM_CLICK, Current, id);
1379         }
1380     }
1381
1382     infoPtr->MouseDownID = -1;
1383
1384     return 0;
1385 }
1386
1387 /***********************************************************************
1388  *           SYSLINK_OnEnter
1389  * Handles ENTER key events
1390  */
1391 static BOOL SYSLINK_OnEnter (const SYSLINK_INFO *infoPtr)
1392 {
1393     if(infoPtr->HasFocus && !infoPtr->IgnoreReturn)
1394     {
1395         PDOC_ITEM Focus;
1396         int id;
1397
1398         Focus = SYSLINK_GetFocusLink(infoPtr, &id);
1399         if(Focus)
1400         {
1401             SYSLINK_SendParentNotify(infoPtr, NM_RETURN, Focus, id);
1402             return TRUE;
1403         }
1404     }
1405     return FALSE;
1406 }
1407
1408 /***********************************************************************
1409  *           SYSKEY_SelectNextPrevLink
1410  * Changes the currently focused link
1411  */
1412 static BOOL SYSKEY_SelectNextPrevLink (const SYSLINK_INFO *infoPtr, BOOL Prev)
1413 {
1414     if(infoPtr->HasFocus)
1415     {
1416         PDOC_ITEM Focus;
1417         int id;
1418
1419         Focus = SYSLINK_GetFocusLink(infoPtr, &id);
1420         if(Focus != NULL)
1421         {
1422             PDOC_ITEM NewFocus, OldFocus;
1423
1424             if(Prev)
1425                 NewFocus = SYSLINK_GetPrevLink(infoPtr, Focus);
1426             else
1427                 NewFocus = SYSLINK_GetNextLink(infoPtr, Focus);
1428
1429             if(NewFocus != NULL)
1430             {
1431                 OldFocus = SYSLINK_SetFocusLink(infoPtr, NewFocus);
1432
1433                 if(OldFocus && OldFocus != NewFocus)
1434                 {
1435                     SYSLINK_RepaintLink(infoPtr, OldFocus);
1436                 }
1437                 SYSLINK_RepaintLink(infoPtr, NewFocus);
1438                 return TRUE;
1439             }
1440         }
1441     }
1442     return FALSE;
1443 }
1444
1445 /***********************************************************************
1446  *           SYSKEY_SelectNextPrevLink
1447  * Determines if there's a next or previous link to decide whether the control
1448  * should capture the tab key message
1449  */
1450 static BOOL SYSLINK_NoNextLink (const SYSLINK_INFO *infoPtr, BOOL Prev)
1451 {
1452     PDOC_ITEM Focus, NewFocus;
1453
1454     Focus = SYSLINK_GetFocusLink(infoPtr, NULL);
1455     if(Prev)
1456         NewFocus = SYSLINK_GetPrevLink(infoPtr, Focus);
1457     else
1458         NewFocus = SYSLINK_GetNextLink(infoPtr, Focus);
1459
1460     return NewFocus == NULL;
1461 }
1462
1463 /***********************************************************************
1464  *           SYSLINK_GetIdealSize
1465  * Calculates the ideal size of a link control at a given maximum width.
1466  */
1467 static LONG SYSLINK_GetIdealSize (const SYSLINK_INFO *infoPtr, int cxMaxWidth, SIZE *lpSize)
1468 {
1469     RECT rc;
1470     HDC hdc;
1471
1472     rc.left = rc.top = rc.bottom = 0;
1473     rc.right = cxMaxWidth;
1474
1475     hdc = GetDC(infoPtr->Self);
1476     if (hdc != NULL)
1477     {
1478         HGDIOBJ hOldFont = SelectObject(hdc, infoPtr->Font);
1479
1480         SYSLINK_Render(infoPtr, hdc, &rc);
1481
1482         SelectObject(hdc, hOldFont);
1483         ReleaseDC(infoPtr->Self, hdc);
1484
1485         lpSize->cx = rc.right;
1486         lpSize->cy = rc.bottom;
1487     }
1488
1489     return rc.bottom;
1490 }
1491
1492 /***********************************************************************
1493  *           SysLinkWindowProc
1494  */
1495 static LRESULT WINAPI SysLinkWindowProc(HWND hwnd, UINT message,
1496                                         WPARAM wParam, LPARAM lParam)
1497 {
1498     SYSLINK_INFO *infoPtr;
1499
1500     TRACE("hwnd=%p msg=%04x wparam=%lx lParam=%lx\n", hwnd, message, wParam, lParam);
1501
1502     infoPtr = (SYSLINK_INFO *)GetWindowLongPtrW(hwnd, 0);
1503
1504     if (!infoPtr && message != WM_CREATE)
1505         return DefWindowProcW(hwnd, message, wParam, lParam);
1506
1507     switch(message) {
1508     case WM_PRINTCLIENT:
1509     case WM_PAINT:
1510         return SYSLINK_Paint (infoPtr, (HDC)wParam);
1511
1512     case WM_ERASEBKGND:
1513         if (!(infoPtr->Style & LWS_TRANSPARENT))
1514         {
1515             HDC hdc = (HDC)wParam;
1516             HBRUSH brush = CreateSolidBrush( comctl32_color.clrWindow );
1517             RECT rect;
1518
1519             GetClipBox( hdc, &rect );
1520             FillRect( hdc, &rect, brush );
1521             DeleteObject( brush );
1522             return 1;
1523         }
1524         return 0;
1525
1526     case WM_SETCURSOR:
1527     {
1528         LHITTESTINFO ht;
1529         DWORD mp = GetMessagePos();
1530
1531         ht.pt.x = (short)LOWORD(mp);
1532         ht.pt.y = (short)HIWORD(mp);
1533
1534         ScreenToClient(infoPtr->Self, &ht.pt);
1535         if(SYSLINK_HitTest (infoPtr, &ht))
1536         {
1537             SetCursor(LoadCursorW(0, (LPCWSTR)IDC_HAND));
1538             return TRUE;
1539         }
1540
1541         return DefWindowProcW(hwnd, message, wParam, lParam);
1542     }
1543
1544     case WM_SIZE:
1545     {
1546         RECT rcClient;
1547         if (GetClientRect(infoPtr->Self, &rcClient))
1548         {
1549             HDC hdc = GetDC(infoPtr->Self);
1550             if(hdc != NULL)
1551             {
1552                 SYSLINK_Render(infoPtr, hdc, &rcClient);
1553                 ReleaseDC(infoPtr->Self, hdc);
1554             }
1555         }
1556         return 0;
1557     }
1558
1559     case WM_GETFONT:
1560         return (LRESULT)infoPtr->Font;
1561
1562     case WM_SETFONT:
1563         return (LRESULT)SYSLINK_SetFont(infoPtr, (HFONT)wParam, (BOOL)lParam);
1564
1565     case WM_SETTEXT:
1566         SYSLINK_SetText(infoPtr, (LPWSTR)lParam);
1567         return DefWindowProcW(hwnd, message, wParam, lParam);
1568
1569     case WM_LBUTTONDOWN:
1570     {
1571         POINT pt;
1572         pt.x = (short)LOWORD(lParam);
1573         pt.y = (short)HIWORD(lParam);
1574         return SYSLINK_LButtonDown(infoPtr, &pt);
1575     }
1576     case WM_LBUTTONUP:
1577     {
1578         POINT pt;
1579         pt.x = (short)LOWORD(lParam);
1580         pt.y = (short)HIWORD(lParam);
1581         return SYSLINK_LButtonUp(infoPtr, &pt);
1582     }
1583
1584     case WM_KEYDOWN:
1585     {
1586         switch(wParam)
1587         {
1588         case VK_RETURN:
1589             SYSLINK_OnEnter(infoPtr);
1590             return 0;
1591         case VK_TAB:
1592         {
1593             BOOL shift = GetKeyState(VK_SHIFT) & 0x8000;
1594             SYSKEY_SelectNextPrevLink(infoPtr, shift);
1595             return 0;
1596         }
1597         default:
1598             return DefWindowProcW(hwnd, message, wParam, lParam);
1599         }
1600     }
1601
1602     case WM_GETDLGCODE:
1603     {
1604         LRESULT Ret = DLGC_HASSETSEL;
1605         int vk = (lParam != 0 ? (int)((LPMSG)lParam)->wParam : 0);
1606         switch(vk)
1607         {
1608         case VK_RETURN:
1609             Ret |= DLGC_WANTMESSAGE;
1610             break;
1611         case VK_TAB:
1612         {
1613             BOOL shift = GetKeyState(VK_SHIFT) & 0x8000;
1614             if(!SYSLINK_NoNextLink(infoPtr, shift))
1615             {
1616                 Ret |= DLGC_WANTTAB;
1617             }
1618             else
1619             {
1620                 Ret |= DLGC_WANTCHARS;
1621             }
1622             break;
1623         }
1624         }
1625         return Ret;
1626     }
1627
1628     case WM_NCHITTEST:
1629     {
1630         POINT pt;
1631         RECT rc;
1632         pt.x = (short)LOWORD(lParam);
1633         pt.y = (short)HIWORD(lParam);
1634
1635         GetClientRect(infoPtr->Self, &rc);
1636         ScreenToClient(infoPtr->Self, &pt);
1637         if(pt.x < 0 || pt.y < 0 || pt.x > rc.right || pt.y > rc.bottom)
1638         {
1639             return HTNOWHERE;
1640         }
1641
1642         if(SYSLINK_LinkAtPt(infoPtr, &pt, NULL, FALSE))
1643         {
1644             return HTCLIENT;
1645         }
1646
1647         return HTTRANSPARENT;
1648     }
1649
1650     case LM_HITTEST:
1651         return SYSLINK_HitTest(infoPtr, (PLHITTESTINFO)lParam);
1652
1653     case LM_SETITEM:
1654         return SYSLINK_SetItem(infoPtr, (PLITEM)lParam);
1655
1656     case LM_GETITEM:
1657         return SYSLINK_GetItem(infoPtr, (PLITEM)lParam);
1658
1659     case LM_GETIDEALHEIGHT:
1660         if (lParam)
1661             return SYSLINK_GetIdealSize(infoPtr, (int)wParam, (SIZE *)lParam);
1662         else
1663             return SYSLINK_GetIdealHeight(infoPtr);
1664
1665     case WM_SETFOCUS:
1666         return SYSLINK_SetFocus(infoPtr);
1667
1668     case WM_KILLFOCUS:
1669         return SYSLINK_KillFocus(infoPtr);
1670
1671     case WM_ENABLE:
1672         infoPtr->Style &= ~WS_DISABLED;
1673         infoPtr->Style |= (wParam ? 0 : WS_DISABLED);
1674         InvalidateRect (infoPtr->Self, NULL, FALSE);
1675         return 0;
1676
1677     case WM_STYLECHANGED:
1678         if (wParam == GWL_STYLE)
1679         {
1680             infoPtr->Style = ((LPSTYLESTRUCT)lParam)->styleNew;
1681
1682             InvalidateRect(infoPtr->Self, NULL, TRUE);
1683         }
1684         return 0;
1685
1686     case WM_CREATE:
1687     {
1688         CREATESTRUCTW *cs = (CREATESTRUCTW*)lParam;
1689
1690         /* allocate memory for info struct */
1691         infoPtr = Alloc (sizeof(SYSLINK_INFO));
1692         if (!infoPtr) return -1;
1693         SetWindowLongPtrW (hwnd, 0, (DWORD_PTR)infoPtr);
1694
1695         /* initialize the info struct */
1696         infoPtr->Self = hwnd;
1697         infoPtr->Notify = cs->hwndParent;
1698         infoPtr->Style = cs->style;
1699         infoPtr->Font = 0;
1700         infoPtr->LinkFont = 0;
1701         list_init(&infoPtr->Items);
1702         infoPtr->HasFocus = FALSE;
1703         infoPtr->MouseDownID = -1;
1704         infoPtr->TextColor = comctl32_color.clrWindowText;
1705         infoPtr->LinkColor = comctl32_color.clrHighlight;
1706         infoPtr->VisitedColor = comctl32_color.clrHighlight;
1707         infoPtr->BreakChar = ' ';
1708         infoPtr->IgnoreReturn = infoPtr->Style & LWS_IGNORERETURN;
1709         TRACE("SysLink Ctrl creation, hwnd=%p\n", hwnd);
1710         SYSLINK_SetText(infoPtr, cs->lpszName);
1711         return 0;
1712     }
1713     case WM_DESTROY:
1714         TRACE("SysLink Ctrl destruction, hwnd=%p\n", hwnd);
1715         SYSLINK_ClearDoc(infoPtr);
1716         if(infoPtr->Font != 0) DeleteObject(infoPtr->Font);
1717         if(infoPtr->LinkFont != 0) DeleteObject(infoPtr->LinkFont);
1718         SetWindowLongPtrW(hwnd, 0, 0);
1719         Free (infoPtr);
1720         return 0;
1721
1722     case WM_SYSCOLORCHANGE:
1723         COMCTL32_RefreshSysColors();
1724         return 0;
1725
1726     default:
1727         if ((message >= WM_USER) && (message < WM_APP) && !COMCTL32_IsReflectedMessage(message))
1728         {
1729             ERR("unknown msg %04x wp=%04lx lp=%08lx\n", message, wParam, lParam );
1730         }
1731         return DefWindowProcW(hwnd, message, wParam, lParam);
1732     }
1733 }
1734
1735
1736 /***********************************************************************
1737  * SYSLINK_Register [Internal]
1738  *
1739  * Registers the SysLink window class.
1740  */
1741 VOID SYSLINK_Register (void)
1742 {
1743     WNDCLASSW wndClass;
1744
1745     ZeroMemory (&wndClass, sizeof(wndClass));
1746     wndClass.style         = CS_GLOBALCLASS | CS_VREDRAW | CS_HREDRAW;
1747     wndClass.lpfnWndProc   = SysLinkWindowProc;
1748     wndClass.cbClsExtra    = 0;
1749     wndClass.cbWndExtra    = sizeof (SYSLINK_INFO *);
1750     wndClass.hCursor       = LoadCursorW (0, (LPWSTR)IDC_ARROW);
1751     wndClass.lpszClassName = WC_LINK;
1752
1753     RegisterClassW (&wndClass);
1754 }
1755
1756
1757 /***********************************************************************
1758  * SYSLINK_Unregister [Internal]
1759  *
1760  * Unregisters the SysLink window class.
1761  */
1762 VOID SYSLINK_Unregister (void)
1763 {
1764     UnregisterClassW (WC_LINK, NULL);
1765 }