src/frontends/xforms/FormFiledialog.C

   1 /**
   2  * \file FormFiledialog.C
   3  * Copyright 2001 the LyX Team
   4  * Read the file COPYING
   5  *
   6  * \author unknown
   7  * \author John Levon
   8  */
   9
  10 #include <config.h>
  11
  12 #include <unistd.h>
  13 #include <cstdlib>
  14 #include <pwd.h>
  15 #include <grp.h>
  16 #include <cstring>
  17 #include <map>
  18 #include <algorithm>
  19
  20 using std::map;
  21 using std::max;
  22 using std::sort;
  23
  24 #include "lyx_gui_misc.h" // for WriteFSAlert
  25 #include "support/FileInfo.h"
  26 #include "support/lyxlib.h"
  27 #include "gettext.h"
  28 #include "frontends/Dialogs.h"
  29
  30 #ifdef HAVE_ERRNO_H
  31 #include <cerrno>
  32 #endif
  33
  34 #if HAVE_DIRENT_H
  35 # include <dirent.h>
  36 # define NAMLEN(dirent) strlen((dirent)->d_name)
  37 #else
  38 # define dirent direct
  39 # define NAMLEN(dirent) (dirent)->d_namlen
  40 # if HAVE_SYS_NDIR_H
  41 #  include <sys/ndir.h>
  42 # endif
  43 # if HAVE_SYS_DIR_H
  44 #  include <sys/dir.h>
  45 # endif
  46 # if HAVE_NDIR_H
  47 #  include <ndir.h>
  48 # endif
  49 #endif
  50
  51 #if TIME_WITH_SYS_TIME
  52 # include <sys/time.h>
  53 # include <ctime>
  54 #else
  55 # if HAVE_SYS_TIME_H
  56 #  include <sys/time.h>
  57 # else
  58 #  include <ctime>
  59 # endif
  60 #endif
  61
  62 // FIXME: should be autoconfiscated
  63 #ifdef BROKEN_HEADERS
  64 extern "C" int gettimeofday(struct timeval *, struct timezone *);
  65 #endif
  66
  67 #ifdef __GNUG__
  68 #pragma implementation
  69 #endif
  70
  71 #include "support/filetools.h"
  72 #include "FormFiledialog.h"
  73
  74 // six months, in seconds
  75 static const long SIX_MONTH_SEC = 6L * 30L * 24L * 60L * 60L;
  76 static const long ONE_HOUR_SEC = 60L * 60L;
  77
  78 // *** User cache class implementation
  79 /// User cache class definition
  80 class UserCache {
  81 public:
  82         /// seeks user name from group ID
  83         string const & find(uid_t ID) const {
  84                 Users::const_iterator cit = users.find(ID);
  85                 if (cit == users.end()) {
  86                         add(ID);
  87                         return users[ID];
  88                 }
  89                 return (*cit).second;
  90         }
  91 private:
  92         ///
  93         void add(uid_t ID) const;
  94         ///
  95         typedef map<uid_t, string> Users;
  96         ///
  97         mutable Users users;
  98 };
  99
 100
 101 void UserCache::add(uid_t ID) const
 102 {
 103         string pszNewName;
 104         struct passwd * pEntry;
 105
 106         // gets user name
 107         if ((pEntry = getpwuid(ID)))
 108                 pszNewName = pEntry->pw_name;
 109         else {
 110                 pszNewName = tostr(ID);
 111         }
 112
 113         // adds new node
 114         users[ID] = pszNewName;
 115 }
 116
 117
 118 /// Group cache class definition
 119 class GroupCache {
 120 public:
 121         /// seeks group name from group ID
 122         string const & find(gid_t ID) const ;
 123 private:
 124         ///
 125         void add(gid_t ID) const;
 126         ///
 127         typedef map<gid_t, string> Groups;
 128         ///
 129         mutable Groups groups;
 130 };
 131
 132
 133 string const & GroupCache::find(gid_t ID) const
 134 {
 135         Groups::const_iterator cit = groups.find(ID);
 136         if (cit == groups.end()) {
 137                 add(ID);
 138                 return groups[ID];
 139         }
 140         return (*cit).second;
 141 }
 142
 143
 144 void GroupCache::add(gid_t ID) const
 145 {
 146         string pszNewName;
 147         struct group * pEntry;
 148
 149         // gets user name
 150         if ((pEntry = getgrgid(ID))) pszNewName = pEntry->gr_name;
 151         else {
 152                 pszNewName = tostr(ID);
 153         }
 154         // adds new node
 155         groups[ID] = pszNewName;
 156 }
 157
 158
 159 // static instances
 160 static UserCache lyxUserCache;
 161 static GroupCache lyxGroupCache;
 162
 163
 164 // compares two LyXDirEntry objects content (used for sort)
 165 class comp_direntry {
 166 public:
 167         int operator()(DirEntry const & r1,
 168                        DirEntry const & r2) const ;
 169 };
 170         int comp_direntry::operator()(DirEntry const & r1,
 171                        DirEntry const & r2) const {
 172                 bool r1d = suffixIs(r1.pszName, '/');
 173                 bool r2d = suffixIs(r2.pszName, '/');
 174                 if (r1d && !r2d) return 1;
 175                 if (!r1d && r2d) return 0;
 176                 return r1.pszName < r2.pszName;
 177         }
 178
 179
 180 // *** FileDialog::Private class implementation
 181
 182 // static members
 183 FD_form_filedialog * FileDialog::Private::pFileDlgForm = 0;
 184 FileDialog::Private * FileDialog::Private::pCurrentDlg = 0;
 185
 186
 187 // Reread: updates dialog list to match class directory
 188 void FileDialog::Private::Reread()
 189 {
 190         // Opens directory
 191         DIR * pDirectory = ::opendir(pszDirectory.c_str());
 192         if (!pDirectory) {
 193                 WriteFSAlert(_("Warning! Couldn't open directory."),
 194                              pszDirectory);
 195                 pszDirectory = lyx::getcwd();
 196                 pDirectory = ::opendir(pszDirectory.c_str());
 197         }
 198
 199         // Clear the present namelist
 200         direntries.clear();
 201
 202         // Updates display
 203         fl_hide_object(pFileDlgForm->List);
 204         fl_clear_browser(pFileDlgForm->List);
 205         fl_set_input(pFileDlgForm->DirBox, pszDirectory.c_str());
 206
 207         // Splits complete directory name into directories and compute depth
 208         iDepth = 0;
 209         string line, Temp;
 210         char szMode[15];
 211         FileInfo fileInfo;
 212         string File = pszDirectory;
 213         if (File != "/") {
 214                 File = split(File, Temp, '/');
 215         }
 216         while (!File.empty() || !Temp.empty()) {
 217                 string dline = "@b"+line + Temp + '/';
 218                 fl_add_browser_line(pFileDlgForm->List, dline.c_str());
 219                 File = split(File, Temp, '/');
 220                 line += ' ';
 221                 ++iDepth;
 222         }
 223
 224         // Parses all entries of the given subdirectory
 225         time_t curTime = time(0);
 226         rewinddir(pDirectory);
 227         struct dirent * pDirEntry;
 228         while ((pDirEntry = readdir(pDirectory))) {
 229                 bool isLink = false, isDir = false;
 230
 231                 // If the pattern doesn't start with a dot, skip hidden files
 232                 if (!pszMask.empty() && pszMask[0] != '.' &&
 233                     pDirEntry->d_name[0] == '.')
 234                         continue;
 235
 236                 // Gets filename
 237                 string fname = pDirEntry->d_name;
 238
 239                 // Under all circumstances, "." and ".." are not wanted
 240                 if (fname == "." || fname == "..")
 241                         continue;
 242
 243                 // gets file status
 244                 File = AddName(pszDirectory, fname);
 245
 246                 fileInfo.newFile(File, true);
 247                 fileInfo.modeString(szMode);
 248                 unsigned int nlink = fileInfo.getNumberOfLinks();
 249                 string user =   lyxUserCache.find(fileInfo.getUid());
 250                 string group = lyxGroupCache.find(fileInfo.getGid());
 251
 252                 time_t modtime = fileInfo.getModificationTime();
 253                 string Time = ctime(&modtime);
 254
 255                 if (curTime > fileInfo.getModificationTime() + SIX_MONTH_SEC
 256                     || curTime < fileInfo.getModificationTime()
 257                     + ONE_HOUR_SEC) {
 258                         // The file is fairly old or in the future. POSIX says
 259                         // the cutoff is 6 months old. Allow a 1 hour slop
 260                         // factor for what is considered "the future", to
 261                         // allow for NFS server/client clock disagreement.
 262                         // Show the year instead of the time of day.
 263                         Time.erase(10, 9);
 264                         Time.erase(15, string::npos);
 265                 } else {
 266                         Time.erase(16, string::npos);
 267                 }
 268
 269                 string Buffer = string(szMode) + ' ' +
 270                         tostr(nlink) + ' ' +
 271                         user + ' ' +
 272                         group + ' ' +
 273                         Time.substr(4, string::npos) + ' ';
 274
 275                 Buffer += pDirEntry->d_name;
 276                 Buffer += fileInfo.typeIndicator();
 277
 278                 if ((isLink = fileInfo.isLink())) {
 279                         string Link;
 280
 281                         if (LyXReadLink(File, Link)) {
 282                                 Buffer += " -> ";
 283                                 Buffer += Link;
 284
 285                                 // This gives the FileType of the file that
 286                                 // is really pointed too after resolving all
 287                                 // symlinks. This is not necessarily the same
 288                                 // as the type of Link (which could again be a
 289                                 // link). Is that intended?
 290                                 //                              JV 199902
 291                                 fileInfo.newFile(File);
 292                                 Buffer += fileInfo.typeIndicator();
 293                         }
 294                 }
 295
 296                 // filters files according to pattern and type
 297                 if (fileInfo.isRegular()
 298                     || fileInfo.isChar()
 299                     || fileInfo.isBlock()
 300                     || fileInfo.isFifo()) {
 301                         if (!regexMatch(fname, pszMask))
 302                                 continue;
 303                 } else if (!(isDir = fileInfo.isDir()))
 304                         continue;
 305
 306                 DirEntry tmp;
 307
 308                 // Note pszLsEntry is an string!
 309                 tmp.pszLsEntry = Buffer;
 310                 // creates used name
 311                 string temp = fname;
 312                 if (isDir) temp += '/';
 313
 314                 tmp.pszName = temp;
 315                 // creates displayed name
 316                 temp = pDirEntry->d_name;
 317                 if (isLink)
 318                         temp += '@';
 319                 else
 320                         temp += fileInfo.typeIndicator();
 321                 tmp.pszDisplayed = temp;
 322
 323                 direntries.push_back(tmp);
 324         }
 325
 326         closedir(pDirectory);
 327
 328         // Sort the names
 329         sort(direntries.begin(), direntries.end(), comp_direntry());
 330
 331         // Add them to directory box
 332         for (DirEntries::const_iterator cit = direntries.begin();
 333              cit != direntries.end(); ++cit) {
 334                 string const temp = line + (*cit).pszDisplayed;
 335                 fl_add_browser_line(pFileDlgForm->List, temp.c_str());
 336         }
 337         fl_set_browser_topline(pFileDlgForm->List, iDepth);
 338         fl_show_object(pFileDlgForm->List);
 339         iLastSel = -1;
 340 }
 341
 342
 343 // SetDirectory: sets dialog current directory
 344 void FileDialog::Private::SetDirectory(string const & Path)
 345 {
 346         if (!pszDirectory.empty()) {
 347                 string TempPath = ExpandPath(Path); // Expand ~/
 348                 TempPath = MakeAbsPath(TempPath, pszDirectory);
 349                 pszDirectory = MakeAbsPath(TempPath);
 350         } else pszDirectory = MakeAbsPath(Path);
 351 }
 352
 353
 354 // SetMask: sets dialog file mask
 355 void FileDialog::Private::SetMask(string const & NewMask)
 356 {
 357         pszMask = NewMask;
 358         fl_set_input(pFileDlgForm->PatBox, pszMask.c_str());
 359 }
 360
 361
 362 // SetInfoLine: sets dialog information line
 363 void FileDialog::Private::SetInfoLine(string const & Line)
 364 {
 365         pszInfoLine = Line;
 366         fl_set_object_label(pFileDlgForm->FileInfo, pszInfoLine.c_str());
 367 }
 368
 369
 370 FileDialog::Private::Private()
 371 {
 372         pszDirectory = MakeAbsPath(string("."));
 373         pszMask = '*';
 374
 375         // Creates form if necessary.
 376         if (!pFileDlgForm) {
 377                 pFileDlgForm = build_filedialog();
 378                 // Set callbacks. This means that we don't need a patch file
 379                 fl_set_object_callback(pFileDlgForm->DirBox,
 380                                        C_LyXFileDlg_FileDlgCB, 0);
 381                 fl_set_object_callback(pFileDlgForm->PatBox,
 382                                        C_LyXFileDlg_FileDlgCB, 1);
 383                 fl_set_object_callback(pFileDlgForm->List,
 384                                        C_LyXFileDlg_FileDlgCB, 2);
 385                 fl_set_object_callback(pFileDlgForm->Filename,
 386                                        C_LyXFileDlg_FileDlgCB, 3);
 387                 fl_set_object_callback(pFileDlgForm->Rescan,
 388                                        C_LyXFileDlg_FileDlgCB, 10);
 389                 fl_set_object_callback(pFileDlgForm->Home,
 390                                        C_LyXFileDlg_FileDlgCB, 11);
 391                 fl_set_object_callback(pFileDlgForm->User1,
 392                                        C_LyXFileDlg_FileDlgCB, 12);
 393                 fl_set_object_callback(pFileDlgForm->User2,
 394                                        C_LyXFileDlg_FileDlgCB, 13);
 395
 396                 // Make sure pressing the close box doesn't crash LyX. (RvdK)
 397                 fl_set_form_atclose(pFileDlgForm->form,
 398                                     C_LyXFileDlg_CancelCB, 0);
 399                 // Register doubleclick callback
 400                 fl_set_browser_dblclick_callback(pFileDlgForm->List,
 401                                                  C_LyXFileDlg_DoubleClickCB,
 402                                                  0);
 403         }
 404         fl_hide_object(pFileDlgForm->User1);
 405         fl_hide_object(pFileDlgForm->User2);
 406
 407         r_ = Dialogs::redrawGUI.connect(slot(this, &FileDialog::Private::redraw));
 408 }
 409
 410
 411 FileDialog::Private::~Private()
 412 {
 413         r_.disconnect();
 414 }
 415
 416
 417 void FileDialog::Private::redraw()
 418 {
 419         if (pFileDlgForm->form && pFileDlgForm->form->visible)
 420                 fl_redraw_form(pFileDlgForm->form);
 421 }
 422
 423
 424 // SetButton: sets file selector user button action
 425 void FileDialog::Private::SetButton(int iIndex, string const & pszName,
 426                            string const & pszPath)
 427 {
 428         FL_OBJECT * pObject;
 429         string * pTemp;
 430
 431         if (iIndex == 0) {
 432                 pObject = pFileDlgForm->User1;
 433                 pTemp = &pszUserPath1;
 434         } else if (iIndex == 1) {
 435                 pObject = pFileDlgForm->User2;
 436                 pTemp = &pszUserPath2;
 437         } else return;
 438
 439         if (!pszName.empty() && !pszPath.empty()) {
 440                 fl_set_object_label(pObject, pszName.c_str());
 441                 fl_show_object(pObject);
 442                 *pTemp = pszPath;
 443         } else {
 444                 fl_hide_object(pObject);
 445                 (*pTemp).erase();
 446         }
 447 }
 448
 449
 450 // GetDirectory: gets last dialog directory
 451 string const FileDialog::Private::GetDirectory() const
 452 {
 453         if (!pszDirectory.empty())
 454                 return pszDirectory;
 455         else
 456                 return string(".");
 457 }
 458
 459
 460 // RunDialog: handle dialog during file selection
 461 bool FileDialog::Private::RunDialog()
 462 {
 463         force_cancel = false;
 464         force_ok = false;
 465
 466         // event loop
 467         while(true) {
 468                 FL_OBJECT * pObject = fl_do_forms();
 469
 470                 if (pObject == pFileDlgForm->Ready) {
 471                         if (HandleOK())
 472                                 return true;
 473                 } else if (pObject == pFileDlgForm->Cancel
 474                            || force_cancel)
 475                         return false;
 476                 else if (force_ok)
 477                         return true;
 478         }
 479 }
 480
 481
 482 // XForms objects callback (static)
 483 void FileDialog::Private::FileDlgCB(FL_OBJECT *, long lArgument)
 484 {
 485         if (!pCurrentDlg) return;
 486
 487         switch (lArgument) {
 488
 489         case 0: // get directory
 490                 pCurrentDlg->SetDirectory(fl_get_input(pFileDlgForm->DirBox));
 491                 pCurrentDlg->Reread();
 492                 break;
 493
 494         case 1: // get mask
 495                 pCurrentDlg->SetMask(fl_get_input(pFileDlgForm->PatBox));
 496                 pCurrentDlg->Reread();
 497                 break;
 498
 499         case 2: // list
 500                 pCurrentDlg->HandleListHit();
 501                 break;
 502
 503         case 10: // rescan
 504                 pCurrentDlg->SetDirectory(fl_get_input(pFileDlgForm->DirBox));
 505                 pCurrentDlg->SetMask(fl_get_input(pFileDlgForm->PatBox));
 506                 pCurrentDlg->Reread();
 507                 break;
 508
 509         case 11: // home
 510                 pCurrentDlg->SetDirectory(GetEnvPath("HOME"));
 511                 pCurrentDlg->SetMask(fl_get_input(pFileDlgForm->PatBox));
 512                 pCurrentDlg->Reread();
 513                 break;
 514
 515         case 12: // user button 1
 516                 if (!pCurrentDlg->pszUserPath1.empty()) {
 517                         pCurrentDlg->SetDirectory(pCurrentDlg->pszUserPath1);
 518                         pCurrentDlg->SetMask(fl_get_input(pFileDlgForm
 519                                                           ->PatBox));
 520                         pCurrentDlg->Reread();
 521                 }
 522                 break;
 523
 524         case 13: // user button 2
 525                 if (!pCurrentDlg->pszUserPath2.empty()) {
 526                         pCurrentDlg->SetDirectory(pCurrentDlg->pszUserPath2);
 527                         pCurrentDlg->SetMask(fl_get_input(pFileDlgForm
 528                                                           ->PatBox));
 529                         pCurrentDlg->Reread();
 530                 }
 531                 break;
 532
 533         }
 534 }
 535
 536
 537 extern "C" void C_LyXFileDlg_FileDlgCB(FL_OBJECT * ob, long data)
 538 {
 539         FileDialog::Private::FileDlgCB(ob, data);
 540 }
 541
 542
 543 // Handle callback from list
 544 void FileDialog::Private::HandleListHit()
 545 {
 546         // set info line
 547         int const iSelect = fl_get_browser(pFileDlgForm->List);
 548         if (iSelect > iDepth)  {
 549                 SetInfoLine(direntries[iSelect - iDepth - 1].pszLsEntry);
 550         } else {
 551                 SetInfoLine(string());
 552         }
 553 }
 554
 555
 556 // Callback for double click in list
 557 void FileDialog::Private::DoubleClickCB(FL_OBJECT *, long)
 558 {
 559         if (pCurrentDlg->HandleDoubleClick())
 560                 // Simulate click on OK button
 561                 pCurrentDlg->Force(false);
 562 }
 563
 564
 565 extern "C" void C_LyXFileDlg_DoubleClickCB(FL_OBJECT * ob, long data)
 566 {
 567         FileDialog::Private::DoubleClickCB(ob, data);
 568 }
 569
 570
 571 // Handle double click from list
 572 bool FileDialog::Private::HandleDoubleClick()
 573 {
 574         string pszTemp;
 575
 576         // set info line
 577         bool isDir = true;
 578         int const iSelect = fl_get_browser(pFileDlgForm->List);
 579         if (iSelect > iDepth)  {
 580                 pszTemp = direntries[iSelect - iDepth - 1].pszName;
 581                 SetInfoLine(direntries[iSelect - iDepth - 1].pszLsEntry);
 582                 if (!suffixIs(pszTemp, '/')) {
 583                         isDir = false;
 584                         fl_set_input(pFileDlgForm->Filename, pszTemp.c_str());
 585                 }
 586         } else if (iSelect != 0) {
 587                 SetInfoLine(string());
 588         } else
 589                 return true;
 590
 591         // executes action
 592         if (isDir) {
 593                 string Temp;
 594
 595                 // builds new directory name
 596                 if (iSelect > iDepth) {
 597                         // Directory deeper down
 598                         // First, get directory with trailing /
 599                         Temp = fl_get_input(pFileDlgForm->DirBox);
 600                         if (!suffixIs(Temp, '/'))
 601                                 Temp += '/';
 602                         Temp += pszTemp;
 603                 } else {
 604                         // Directory higher up
 605                         Temp.erase();
 606                         for (int i = 0; i < iSelect; ++i) {
 607                                 string piece = fl_get_browser_line(pFileDlgForm->List, i+1);
 608                                 // The '+2' is here to count the '@b' (JMarc)
 609                                 Temp += piece.substr(i + 2);
 610                         }
 611                 }
 612
 613                 // assigns it
 614                 SetDirectory(Temp);
 615                 Reread();
 616                 return false;
 617         }
 618         return true;
 619 }
 620
 621
 622 // Handle OK button call
 623 bool FileDialog::Private::HandleOK()
 624 {
 625         // mask was changed
 626         string pszTemp = fl_get_input(pFileDlgForm->PatBox);
 627         if (pszTemp != pszMask) {
 628                 SetMask(pszTemp);
 629                 Reread();
 630                 return false;
 631         }
 632
 633         // directory was changed
 634         pszTemp = fl_get_input(pFileDlgForm->DirBox);
 635         if (pszTemp!= pszDirectory) {
 636                 SetDirectory(pszTemp);
 637                 Reread();
 638                 return false;
 639         }
 640
 641         // Handle return from list
 642         int const select = fl_get_browser(pFileDlgForm->List);
 643         if (select > iDepth) {
 644                 string const temp = direntries[select - iDepth - 1].pszName;
 645                 if (!suffixIs(temp, '/')) {
 646                         // If user didn't type anything, use browser
 647                         string const name =
 648                                 fl_get_input(pFileDlgForm->Filename);
 649                         if (name.empty()) {
 650                                 fl_set_input(pFileDlgForm->Filename, temp.c_str());
 651                         }
 652                         return true;
 653                 }
 654         }
 655
 656         // Emulate a doubleclick
 657         return HandleDoubleClick();
 658 }
 659
 660
 661 // Handle Cancel CB from WM close
 662 int FileDialog::Private::CancelCB(FL_FORM *, void *)
 663 {
 664         // Simulate a click on the cancel button
 665         pCurrentDlg->Force(true);
 666         return FL_IGNORE;
 667 }
 668
 669
 670 extern "C" int C_LyXFileDlg_CancelCB(FL_FORM *fl, void *xev)
 671 {
 672         return FileDialog::Private::CancelCB(fl, xev);
 673 }
 674
 675
 676 // Simulates a click on OK/Cancel
 677 void FileDialog::Private::Force(bool cancel)
 678 {
 679         if (cancel) {
 680                 force_cancel = true;
 681                 fl_set_button(pFileDlgForm->Cancel, 1);
 682         } else {
 683                 force_ok = true;
 684                 fl_set_button(pFileDlgForm->Ready, 1);
 685         }
 686         // Start timer to break fl_do_forms loop soon
 687         fl_set_timer(pFileDlgForm->timer, 0.1);
 688 }
 689
 690
 691 // Select: launches dialog and returns selected file
 692 string const FileDialog::Private::Select(string const & title, string const & path,
 693                                 string const & mask, string const & suggested)
 694 {
 695         // handles new mask and path
 696         bool isOk = true;
 697         if (!mask.empty()) {
 698                 SetMask(mask);
 699                 isOk = false;
 700         }
 701         if (!path.empty()) {
 702                 SetDirectory(path);
 703                 isOk = false;
 704         }
 705         if (!isOk) Reread();
 706
 707         // highlight the suggested file in the browser, if it exists.
 708         int sel = 0;
 709         string const filename = OnlyFilename(suggested);
 710         if (!filename.empty()) {
 711                 for (int i = 0;
 712                      i < fl_get_browser_maxline(pFileDlgForm->List); ++i) {
 713                         string s =
 714                                 fl_get_browser_line(pFileDlgForm->List, i + 1);
 715                         s = strip(frontStrip(s));
 716                         if (s == filename) {
 717                                 sel = i + 1;
 718                                 break;
 719                         }
 720                 }
 721         }
 722
 723         if (sel != 0) fl_select_browser_line(pFileDlgForm->List, sel);
 724         int const top = max(sel - 5, 1);
 725         fl_set_browser_topline(pFileDlgForm->List, top);
 726
 727         // checks whether dialog can be started
 728         if (pCurrentDlg) return string();
 729         pCurrentDlg = this;
 730
 731         // runs dialog
 732         SetInfoLine(string());
 733         fl_set_input(pFileDlgForm->Filename, suggested.c_str());
 734         fl_set_button(pFileDlgForm->Cancel, 0);
 735         fl_set_button(pFileDlgForm->Ready, 0);
 736         fl_set_focus_object(pFileDlgForm->form, pFileDlgForm->Filename);
 737         fl_deactivate_all_forms();
 738         fl_show_form(pFileDlgForm->form,
 739                      FL_PLACE_MOUSE | FL_FREE_SIZE, 0,
 740                      title.c_str());
 741
 742         isOk = RunDialog();
 743
 744         fl_hide_form(pFileDlgForm->form);
 745         fl_activate_all_forms();
 746         pCurrentDlg = 0;
 747
 748         // Returns filename or string() if no valid selection was made
 749         if (!isOk || !fl_get_input(pFileDlgForm->Filename)[0]) return string();
 750
 751         pszFileName = fl_get_input(pFileDlgForm->Filename);
 752
 753         if (!AbsolutePath(pszFileName)) {
 754                 pszFileName = AddName(fl_get_input(pFileDlgForm->DirBox),
 755                                       pszFileName);
 756         }
 757         return pszFileName;
 758 }