src/BufferView.C

   1 // -*- C++ -*-
   2 /* This file is part of
   3  * ======================================================
   4  *
   5  *           LyX, The Document Processor
   6  *
   7  *           Copyright 1995 Matthias Ettrich
   8  *           Copyright 1995-1999 The LyX Team.
   9  *
  10  * ====================================================== */
  11
  12 #include <config.h>
  13
  14 #include <algorithm>
  15 #include <cstdlib>
  16 #include <csignal>
  17
  18 #include <unistd.h>
  19 #include <sys/wait.h>
  20
  21 #include "support/lstrings.h"
  22
  23 #ifdef __GNUG__
  24 #pragma implementation
  25 #endif
  26
  27 #include "commandtags.h"
  28 #include "BufferView.h"
  29 #include "bufferlist.h"
  30 #include "LyXView.h"
  31 #include "lyxfunc.h"
  32 #include "insets/lyxinset.h"
  33 #include "minibuffer.h"
  34 #include "lyxscreen.h"
  35 #include "up.xpm"
  36 #include "down.xpm"
  37 #include "debug.h"
  38 #include "lyxdraw.h"
  39 #include "lyx_gui_misc.h"
  40 #include "BackStack.h"
  41 #include "lyxtext.h"
  42 #include "lyx_cb.h"
  43 #include "gettext.h"
  44 #include "layout.h"
  45
  46 using std::find_if;
  47
  48 extern BufferList bufferlist;
  49 void sigchldhandler(pid_t pid, int * status);
  50
  51 extern void SetXtermCursor(Window win);
  52 extern bool input_prohibited;
  53 extern bool selection_possible;
  54 extern void BeforeChange();
  55 extern char ascii_type;
  56 extern int UnlockInset(UpdatableInset * inset);
  57 extern void ToggleFloat();
  58 extern void MenuPasteSelection(char at);
  59 extern InsetUpdateStruct * InsetUpdateList;
  60 extern void UpdateInsetUpdateList();
  61 extern void FreeUpdateTimer();
  62
  63 // This is _very_ temporary
  64 FL_OBJECT * figinset_canvas;
  65
  66 BufferView::BufferView(LyXView * o, int xpos, int ypos,
  67                        int width, int height)
  68         : owner_(o)
  69 {
  70         buffer_ = 0;
  71         text = 0;
  72         screen = 0;
  73         work_area = 0;
  74         figinset_canvas = 0;
  75         scrollbar = 0;
  76         button_down = 0;
  77         button_up = 0;
  78         timer_cursor = 0;
  79         current_scrollbar_value = 0;
  80         create_view(xpos, ypos, width, height);
  81         // Activate the timer for the cursor
  82         fl_set_timer(timer_cursor, 0.4);
  83         fl_set_focus_object(owner_->getForm(), work_area);
  84         work_area_focus = true;
  85         lyx_focus = false;
  86 }
  87
  88
  89 BufferView::~BufferView()
  90 {
  91         delete text;
  92 }
  93
  94 // This is only the very first implemetation and use of the TextCache,
  95 // operations on it needs to be put into a class or a namespace, that part
  96 // is _NOT_ finished so don't bother to come with too many comments on it
  97 // (unless you have some nice ideas on where/how to do it)
  98 //
  99 // I think we need a TextCache that is common for all BufferViews,
 100 // please tell if you don't agree.
 101 //
 102 // Q. What are we caching?
 103 // A. We are caching the screen representations (LyXText) of the
 104 //    documents (Buffer,LyXParagraph) for specific BufferView widths.
 105 // Q. Why the cache?
 106 // A. It is not really needed, but it speeds things up a lot
 107 //    when you have more than one document loaded at once since a total
 108 //    rebreak (reformatting) need not be done when switching between
 109 //    documents. When the cache is in function a document only needs to be
 110 //    formatted upon loading and when the with of the BufferView changes.
 111 //    Later it will also be unneccessary to reformat when having two
 112 //    BufferViews of equal width with the same document, a simple copy
 113 //    of the LyXText structure will do.
 114 // Invariant for the TextCache:
 115 //        - The buffer of the text  in the TextCache _must_ exists
 116 //          in the bufferlist.
 117 //        - For a text in the TextCache there _must not_ be an equivalent
 118 //          text in any BufferView. (same buffer and width).
 119 // Among others this mean:
 120 //        - When a document is closed all trace of it must be removed from
 121 //          the TextCache.
 122 // Senarios:
 123 //    I belive there are only three possible senarios where the two first
 124 //    are also covered by the third.
 125 //        - The simplest senario is what we have now, a single BufferView only.
 126 //          o Opening
 127 //            Nothing to do with the TextCache is done when opening a file.
 128 //          o Switching
 129 //            We switch from buffer A to buffer B.
 130 //            * A's text is cached in TextCache.
 131 //            * We make a search for a text in TextCache that fits B
 132 //              (same buffer and same width).
 133 //          o Horisontal resize
 134 //            If the BufferView's width (LyXView) is horisontaly changed all
 135 //            the entries in the TextCache is deleted. (This causes
 136 //            reformat of all loaded documents when next viewed)
 137 //          o Close
 138 //            When a buffer is closed we don't have to do anything, becuase
 139 //            to close a single buffer it is required to only exist in the
 140 //            BufferView and not in the TextCache. Upon LFUN_QUIT we
 141 //            don't really care since everything is deleted anyway.
 142 //        - The next scenario is when we have several BufferViews (in one or
 143 //          more LyXViews) of equal width.
 144 //          o Opening
 145 //            Nothing to do with the TextCache is done when opening a file.
 146 //          o Switching
 147 //            We switch from buffer A to buffer B.
 148 //            * If A is in another Bufferview we do not put it into TextCache.
 149 //              else we put A into TextCache.
 150 //            * If B is viewed in another BufferView we make a copy of its
 151 //              text and use that, else we search in TextCache for a match.
 152 //              (same buffer same width)
 153 //          o Horisontal resize
 154 //            If the BufferView's width (LyXView) is horisontaly changed all
 155 //            the entries in the TextCache is deleted. (This causes
 156 //            reformat of all loaded documents when next viewed)
 157 //          o Close
 158 //        - The last scenario should cover both the previous ones, this time
 159 //          we have several BufferViews (in one or more LyXViews) with no
 160 //          limitations on width. (And if you wonder why the two other
 161 //          senarios are needed... I used them to get to this one.)
 162 //          o Opening
 163 //            Nothing to do with the TextCache is done when opening a file.
 164 //          o Switching
 165 //            We switch from buffer A to buffer B.
 166 //          o Horisontal resize
 167 //          o Close
 168
 169 typedef vector<LyXText*> TextCache;
 170 TextCache textcache;
 171
 172 class text_fits {
 173 public:
 174         text_fits(Buffer * b, unsigned short p)
 175                 : buf(b), pw(p) {}
 176         bool operator()(TextCache::value_type & vt) {
 177                 if (vt->params == buf && vt->paperWidth() == pw) return true;
 178                 return false;
 179         }
 180 private:
 181         Buffer * buf;
 182         unsigned short pw;
 183 };
 184
 185
 186 class show_text {
 187 public:
 188         show_text(ostream & o) : os(o) {}
 189         void operator()(TextCache::value_type & vt) {
 190                 os << "Buffer: " << vt->params
 191                    << "\nWidth: " << vt->paperWidth() << endl;
 192         }
 193 private:
 194         ostream & os;
 195 };
 196
 197 void showTextCache(string const & str)
 198 {
 199         lyxerr << "TextCache: " << str << endl;
 200         for_each(textcache.begin(), textcache.end(), show_text(lyxerr));
 201 }
 202
 203
 204 void BufferView::buffer(Buffer * b)
 205 {
 206         lyxerr[Debug::INFO] << "Setting buffer in BufferView" << endl;
 207         if (buffer_) {
 208                 buffer_->InsetSleep();
 209                 buffer_->delUser(this);
 210                 // Put the old text into the TextCache.
 211                 textcache.push_back(text);
 212                 showTextCache("buffer");
 213                 // delete text;
 214                 text = 0;
 215         }
 216
 217         // Set current buffer
 218         buffer_ = b;
 219
 220         if (bufferlist.getState() == BufferList::CLOSING) return;
 221
 222         // Nuke old image
 223         // screen is always deleted when the buffer is changed.
 224         if (screen)
 225                 delete screen;
 226         screen = 0;
 227
 228         // If we are closing the buffer, use the first buffer as current
 229         if (!buffer_) {
 230                 buffer_ = bufferlist.first();
 231         }
 232
 233         if (buffer_) {
 234                 lyxerr[Debug::INFO] << "  Buffer addr: " << buffer_ << endl;
 235                 buffer_->addUser(this);
 236                 owner_->getMenus()->showMenus();
 237                 // If we don't have a text object for this, we make one
 238                 if (text == 0)
 239                         resizeCurrentBuffer();
 240                 else {
 241                         updateScreen();
 242                         updateScrollbar();
 243                 }
 244                 screen->first = screen->TopCursorVisible();
 245                 redraw();
 246                 updateAllVisibleBufferRelatedPopups();
 247                 buffer_->InsetWakeup();
 248         } else {
 249                 lyxerr[Debug::INFO] << "  No Buffer!" << endl;
 250                 owner_->getMenus()->hideMenus();
 251                 updateScrollbar();
 252                 fl_redraw_object(work_area);
 253                 // Also remove all remaining text's from the testcache.
 254                 showTextCache("buffer delete all");
 255                 while (!textcache.empty()) {
 256                         LyXText * tt = textcache.front();
 257                         textcache.erase(textcache.begin());
 258                         delete tt;
 259                 }
 260         }
 261         // should update layoutchoice even if we don't have a buffer.
 262         owner_->updateLayoutChoice();
 263         owner_->getMiniBuffer()->Init();
 264         owner_->updateWindowTitle();
 265 }
 266
 267
 268 void BufferView::updateScreen()
 269 {
 270         // Regenerate the screen.
 271         if (screen)
 272                 delete screen;
 273         screen = new LyXScreen(FL_ObjWin(work_area),
 274                                work_area->w,
 275                                work_area->h,
 276                                work_area->x,
 277                                work_area->y,
 278                                text);
 279 }
 280
 281
 282 void BufferView::resize()
 283 {
 284         // This will resize the buffer. (Asger)
 285         if (buffer_)
 286                 resizeCurrentBuffer();
 287 }
 288
 289
 290 static bool lgb_hack = false;
 291
 292 void BufferView::redraw()
 293 {
 294         lyxerr[Debug::INFO] << "BufferView::redraw()" << endl;
 295         lgb_hack = true;
 296         fl_redraw_object(work_area);
 297         fl_redraw_object(scrollbar);
 298         fl_redraw_object(button_down);
 299         fl_redraw_object(button_up);
 300         lgb_hack = false;
 301 }
 302
 303
 304 void BufferView::fitCursor()
 305 {
 306         if (screen) screen->FitCursor();
 307 }
 308
 309
 310 void BufferView::update()
 311 {
 312         if (screen) screen->Update();
 313 }
 314
 315
 316 void BufferView::updateScrollbar()
 317 {
 318         /* If the text is smaller than the working area, the scrollbar
 319          * maximum must be the working area height. No scrolling will
 320          * be possible */
 321
 322         if (!buffer_) {
 323                 fl_set_slider_value(scrollbar, 0);
 324                 fl_set_slider_size(scrollbar, scrollbar->h);
 325                 return;
 326         }
 327
 328         static long max2 = 0;
 329         static long height2 = 0;
 330
 331         long cbth = 0;
 332         long cbsf = 0;
 333
 334         if (text)
 335                 cbth = text->height;
 336         if (screen)
 337                 cbsf = screen->first;
 338
 339         // check if anything has changed.
 340         if (max2 == cbth &&
 341             height2 == work_area->h &&
 342             current_scrollbar_value == cbsf)
 343                 return;       // no
 344
 345         max2 = cbth;
 346         height2 = work_area->h;
 347         current_scrollbar_value = cbsf;
 348
 349         if (cbth <= height2) { // text is smaller than screen
 350                 fl_set_slider_size(scrollbar, scrollbar->h);
 351                 return;
 352         }
 353
 354         long maximum_height = work_area->h * 3 / 4 + cbth;
 355         long value = cbsf;
 356
 357         // set the scrollbar
 358         double hfloat = work_area->h;
 359         double maxfloat = maximum_height;
 360
 361         fl_set_slider_value(scrollbar, value);
 362         fl_set_slider_bounds(scrollbar, 0,
 363                              maximum_height - work_area->h);
 364 #if FL_REVISION > 85
 365         double lineh = text->DefaultHeight();
 366         fl_set_slider_increment(scrollbar, work_area->h-lineh, lineh);
 367 #endif
 368         if (maxfloat > 0){
 369                 if ((hfloat / maxfloat) * float(height2) < 3)
 370                         fl_set_slider_size(scrollbar,
 371                                            3 / float(height2));
 372                 else
 373                         fl_set_slider_size(scrollbar,
 374                                            hfloat / maxfloat);
 375         } else
 376                 fl_set_slider_size(scrollbar, hfloat);
 377         fl_set_slider_precision(scrollbar, 0);
 378 }
 379
 380
 381 void BufferView::redoCurrentBuffer()
 382 {
 383         lyxerr[Debug::INFO] << "BufferView::redoCurrentBuffer" << endl;
 384         if (buffer_ && text) {
 385                 resize();
 386                 owner_->updateLayoutChoice();
 387         }
 388 }
 389
 390
 391 int BufferView::resizeCurrentBuffer()
 392 {
 393         lyxerr[Debug::INFO] << "resizeCurrentBuffer" << endl;
 394
 395         LyXParagraph * par = 0;
 396         LyXParagraph * selstartpar = 0;
 397         LyXParagraph * selendpar = 0;
 398         int pos = 0;
 399         int selstartpos = 0;
 400         int selendpos = 0;
 401         int selection = 0;
 402         int mark_set = 0;
 403
 404         ProhibitInput();
 405
 406         owner_->getMiniBuffer()->Set(_("Formatting document..."));
 407
 408         if (text) {
 409                 par = text->cursor.par;
 410                 pos = text->cursor.pos;
 411                 selstartpar = text->sel_start_cursor.par;
 412                 selstartpos = text->sel_start_cursor.pos;
 413                 selendpar = text->sel_end_cursor.par;
 414                 selendpos = text->sel_end_cursor.pos;
 415                 selection = text->selection;
 416                 mark_set = text->mark_set;
 417                 delete text;
 418                 text = new LyXText(work_area->w, buffer_);
 419         } else {
 420                 // See if we have a text in TextCache that fits
 421                 // the new buffer_ with the correct width.
 422                 TextCache::iterator it =
 423                         find_if(textcache.begin(),
 424                                 textcache.end(),
 425                                 text_fits(buffer_,
 426                                           work_area->w));
 427                 if (it != textcache.end()) {
 428                         text = *it;
 429                         // take it out of textcache.
 430                         textcache.erase(it);
 431                         showTextCache("resizeCurrentBuffer");
 432                 } else {
 433                         text = new LyXText(work_area->w, buffer_);
 434                 }
 435         }
 436         updateScreen();
 437
 438         if (par) {
 439                 text->selection = true;
 440                 /* at this point just to avoid the Delete-Empty-Paragraph
 441                  * Mechanism when setting the cursor */
 442                 text->mark_set = mark_set;
 443                 if (selection) {
 444                         text->SetCursor(selstartpar, selstartpos);
 445                         text->sel_cursor = text->cursor;
 446                         text->SetCursor(selendpar, selendpos);
 447                         text->SetSelection();
 448                         text->SetCursor(par, pos);
 449                 } else {
 450                         text->SetCursor(par, pos);
 451                         text->sel_cursor = text->cursor;
 452                         text->selection = false;
 453                 }
 454         }
 455         screen->first = screen->TopCursorVisible(); /* this will scroll the
 456                                                      * screen such that the
 457                                                      * cursor becomes
 458                                                      * visible */
 459         updateScrollbar();
 460         redraw();
 461         owner_->getMiniBuffer()->Init();
 462         AllowInput();
 463
 464         // Now if the title form still exist kill it
 465         TimerCB(0, 0);
 466
 467         return 0;
 468 }
 469
 470
 471 void BufferView::gotoError()
 472 {
 473         if (!screen)
 474                 return;
 475
 476         screen->HideCursor();
 477         BeforeChange();
 478         update(-2);
 479         LyXCursor tmp;
 480
 481         if (!text->GotoNextError()) {
 482                 if (text->cursor.pos
 483                     || text->cursor.par != text->FirstParagraph()) {
 484                         tmp = text->cursor;
 485                         text->cursor.par = text->FirstParagraph();
 486                         text->cursor.pos = 0;
 487                         if (!text->GotoNextError()) {
 488                                 text->cursor = tmp;
 489                                 owner_->getMiniBuffer()
 490                                         ->Set(_("No more errors"));
 491                                 LyXBell();
 492                         }
 493                 } else {
 494                         owner_->getMiniBuffer()->Set(_("No more errors"));
 495                         LyXBell();
 496                 }
 497         }
 498         update(0);
 499         text->sel_cursor = text->cursor;
 500 }
 501
 502
 503 extern "C" {
 504 // Just a bunch of C wrappers around static members of BufferView
 505         void C_BufferView_UpCB(FL_OBJECT * ob, long buf)
 506         {
 507                 BufferView::UpCB(ob, buf);
 508         }
 509
 510
 511         void C_BufferView_DownCB(FL_OBJECT * ob, long buf)
 512         {
 513                 BufferView::DownCB(ob, buf);
 514         }
 515
 516
 517         void C_BufferView_ScrollCB(FL_OBJECT * ob, long buf)
 518         {
 519                 BufferView::ScrollCB(ob, buf);
 520         }
 521
 522
 523         void C_BufferView_CursorToggleCB(FL_OBJECT * ob, long buf)
 524         {
 525                 BufferView::CursorToggleCB(ob, buf);
 526         }
 527
 528
 529         int C_BufferView_work_area_handler(FL_OBJECT * ob, int event,
 530                                            FL_Coord, FL_Coord,
 531                                            int key, void * xev)
 532         {
 533                 return BufferView::work_area_handler(ob, event,
 534                                                      0, 0, key, xev);
 535         }
 536 }
 537
 538
 539 void BufferView::create_view(int xpos, int ypos, int width, int height)
 540 {
 541         FL_OBJECT * obj;
 542         int const bw = abs(fl_get_border_width());
 543
 544         // a hack for the figinsets (Matthias)
 545         // This one first, then it will probably be invisible. (Lgb)
 546         ::figinset_canvas = figinset_canvas = obj =
 547                   fl_add_canvas(FL_NORMAL_CANVAS,
 548                                 xpos + 1,
 549                                 ypos + 1, 1, 1, "");
 550         fl_set_object_boxtype(obj, FL_NO_BOX);
 551         fl_set_object_resize(obj, FL_RESIZE_ALL);
 552         fl_set_object_gravity(obj, NorthWestGravity, NorthWestGravity);
 553
 554         // a box
 555         obj = fl_add_box(FL_BORDER_BOX, xpos, ypos,
 556                          width - 15,
 557                          height, "");
 558         fl_set_object_resize(obj, FL_RESIZE_ALL);
 559         fl_set_object_gravity(obj, NorthWestGravity, SouthEastGravity);
 560
 561         // the free object
 562         work_area = obj = fl_add_free(FL_INPUT_FREE,
 563                                       xpos + bw, ypos + bw,
 564                                       width - 15 - 2 * bw /* scrollbarwidth */,
 565                                       height - 2 * bw, "",
 566                                       C_BufferView_work_area_handler);
 567         obj->wantkey = FL_KEY_TAB;
 568         obj->u_vdata = this; /* This is how we pass the BufferView
 569                                 to the work_area_handler. */
 570         fl_set_object_boxtype(obj, FL_DOWN_BOX);
 571         fl_set_object_resize(obj, FL_RESIZE_ALL);
 572         fl_set_object_gravity(obj, NorthWestGravity, SouthEastGravity);
 573
 574         //
 575         // THE SCROLLBAR
 576         //
 577
 578         // up - scrollbar button
 579 #if FL_REVISION > 85
 580         fl_set_border_width(-1);
 581 #else
 582         fl_set_border_width(-2); // to get visible feedback
 583 #endif
 584         button_up = obj = fl_add_pixmapbutton(FL_TOUCH_BUTTON,
 585                                               width - 15 + 4 * bw,
 586                                               ypos,
 587                                               15, 15, "");
 588         fl_set_object_boxtype(obj, FL_UP_BOX);
 589         fl_set_object_color(obj, FL_MCOL, FL_BLUE);
 590         fl_set_object_resize(obj, FL_RESIZE_ALL);
 591         fl_set_object_gravity(obj, NorthEastGravity, NorthEastGravity);
 592         fl_set_object_callback(obj, C_BufferView_UpCB, 0);
 593         obj->u_vdata = this;
 594         fl_set_pixmapbutton_data(obj, const_cast<char**>(up_xpm));
 595
 596 #if FL_REVISION > 85
 597         // Remove the blue feedback rectangle
 598         fl_set_pixmapbutton_focus_outline(obj, 0);
 599 #endif
 600
 601         // the scrollbar slider
 602         fl_set_border_width(-bw);
 603         scrollbar = obj = fl_add_slider(FL_VERT_SLIDER,
 604                                         width - 15 + 4 * bw,
 605                                         ypos + 15,
 606                                         15, height - 30, "");
 607         fl_set_object_color(obj, FL_COL1, FL_MCOL);
 608         fl_set_object_boxtype(obj, FL_UP_BOX);
 609         fl_set_object_resize(obj, FL_RESIZE_ALL);
 610         fl_set_object_gravity(obj, NorthEastGravity, SouthEastGravity);
 611         fl_set_object_callback(obj, C_BufferView_ScrollCB, 0);
 612         obj->u_vdata = this;
 613
 614         // down - scrollbar button
 615 #if FL_REVISION > 85
 616         fl_set_border_width(-1);
 617 #else
 618         fl_set_border_width(-2); // to get visible feedback
 619 #endif
 620         button_down = obj = fl_add_pixmapbutton(FL_TOUCH_BUTTON,
 621                                                 width - 15 + 4 * bw,
 622                                                 ypos + height - 15,
 623                                                 15, 15, "");
 624         fl_set_object_boxtype(obj, FL_UP_BOX);
 625         fl_set_object_color(obj, FL_MCOL, FL_BLUE);
 626         fl_set_object_resize(obj, FL_RESIZE_ALL);
 627         fl_set_object_gravity(obj, SouthEastGravity, SouthEastGravity);
 628         fl_set_object_callback(obj, C_BufferView_DownCB, 0);
 629         obj->u_vdata = this;
 630         fl_set_pixmapbutton_data(obj, const_cast<char**>(down_xpm));
 631         fl_set_border_width(-bw);
 632
 633 #if FL_REVISION > 85
 634         // Remove the blue feedback rectangle
 635         fl_set_pixmapbutton_focus_outline(obj, 0);
 636 #endif
 637
 638         //
 639         // TIMERS
 640         //
 641
 642         // timer_cursor
 643         timer_cursor = obj = fl_add_timer(FL_HIDDEN_TIMER,
 644                                           0, 0, 0, 0, "Timer");
 645         fl_set_object_callback(obj, C_BufferView_CursorToggleCB, 0);
 646         obj->u_vdata = this;
 647 }
 648
 649
 650 // Callback for scrollbar up button
 651 void BufferView::UpCB(FL_OBJECT * ob, long)
 652 {
 653         BufferView * view = static_cast<BufferView*>(ob->u_vdata);
 654
 655         if (view->buffer_ == 0) return;
 656
 657         static long time = 0;
 658         XEvent const * ev2 = fl_last_event();
 659         if (ev2->type == ButtonPress || ev2->type == ButtonRelease)
 660                 time = 0;
 661         int button = fl_get_button_numb(ob);
 662         switch (button) {
 663         case 3:
 664                 view->ScrollUpOnePage(time++); break;
 665         case 2:
 666                 view->ScrollDownOnePage(time++); break;
 667         default:
 668                 view->ScrollUp(time++); break;
 669         }
 670 }
 671
 672
 673 static
 674 void waitForX()
 675 {
 676 #if 0
 677         static Window w = 0;
 678         static Atom a = 0;
 679         if (!a)
 680                 a = XInternAtom(fl_display, "WAIT_FOR_X", False);
 681         if (w == 0) {
 682                 int mask;
 683                 XSetWindowAttributes attr;
 684                 mask = CWOverrideRedirect;
 685                 attr.override_redirect = 1;
 686                 w = XCreateWindow(fl_display, fl_root,
 687                                   0, 0, 1, 1, 0, CopyFromParent,
 688                                   InputOnly, CopyFromParent, mask, &attr);
 689                 XSelectInput(fl_display, w, PropertyChangeMask);
 690                 XMapWindow(fl_display, w);
 691         }
 692         static XEvent ev;
 693         XChangeProperty(fl_display, w, a, a, 8,
 694                         PropModeAppend,
 695                         reinterpret_cast<unsigned char*>(""), 0);
 696         XWindowEvent(fl_display, w, PropertyChangeMask, &ev);
 697 #endif
 698         XSync(fl_get_display(), 0);
 699 }
 700
 701
 702 // Callback for scrollbar slider
 703 void BufferView::ScrollCB(FL_OBJECT * ob, long)
 704 {
 705         BufferView * view = static_cast<BufferView*>(ob->u_vdata);
 706         extern bool cursor_follows_scrollbar;
 707
 708         if (view->buffer_ == 0) return;
 709
 710         view->current_scrollbar_value = long(fl_get_slider_value(ob));
 711         if (view->current_scrollbar_value < 0)
 712                 view->current_scrollbar_value = 0;
 713
 714         if (!view->screen)
 715                 return;
 716
 717         view->screen->Draw(view->current_scrollbar_value);
 718
 719         if (cursor_follows_scrollbar) {
 720                 LyXText * vbt = view->text;
 721                 int height = vbt->DefaultHeight();
 722
 723                 if (vbt->cursor.y < view->screen->first + height) {
 724                         vbt->SetCursorFromCoordinates(0,
 725                                                       view->screen->first +
 726                                                       height);
 727                 }
 728                 else if (vbt->cursor.y >
 729                          view->screen->first + view->work_area->h - height) {
 730                         vbt->SetCursorFromCoordinates(0,
 731                                                       view->screen->first +
 732                                                       view->work_area->h  -
 733                                                       height);
 734                 }
 735         }
 736         waitForX();
 737 }
 738
 739
 740 // Callback for scrollbar down button
 741 void BufferView::DownCB(FL_OBJECT * ob, long)
 742 {
 743         BufferView * view = static_cast<BufferView*>(ob->u_vdata);
 744
 745         if (view->buffer_ == 0) return;
 746
 747         XEvent const * ev2;
 748         static long time = 0;
 749         ev2 = fl_last_event();
 750         if (ev2->type == ButtonPress || ev2->type == ButtonRelease)
 751                 time = 0;
 752         int button = fl_get_button_numb(ob);
 753         switch (button) {
 754         case 2:
 755                 view->ScrollUpOnePage(time++); break;
 756         case 3:
 757                 view->ScrollDownOnePage(time++); break;
 758         default:
 759                 view->ScrollDown(time++); break;
 760         }
 761 }
 762
 763
 764 int BufferView::ScrollUp(long time)
 765 {
 766         if (buffer_ == 0) return 0;
 767         if (!screen) return 0;
 768
 769         double value = fl_get_slider_value(scrollbar);
 770
 771         if (value == 0) return 0;
 772
 773         float add_value =  (text->DefaultHeight()
 774                             + float(time) * float(time) * 0.125);
 775
 776         if (add_value > work_area->h)
 777                 add_value = float(work_area->h -
 778                                   text->DefaultHeight());
 779
 780         value -= add_value;
 781
 782         if (value < 0)
 783                 value = 0;
 784
 785         fl_set_slider_value(scrollbar, value);
 786
 787         ScrollCB(scrollbar, 0);
 788         return 0;
 789 }
 790
 791
 792 int BufferView::ScrollDown(long time)
 793 {
 794         if (buffer_ == 0) return 0;
 795         if (!screen) return 0;
 796
 797         double value= fl_get_slider_value(scrollbar);
 798         double min, max;
 799         fl_get_slider_bounds(scrollbar, &min, &max);
 800
 801         if (value == max) return 0;
 802
 803         float add_value =  (text->DefaultHeight()
 804                             + float(time) * float(time) * 0.125);
 805
 806         if (add_value > work_area->h)
 807                 add_value = float(work_area->h -
 808                                   text->DefaultHeight());
 809
 810         value += add_value;
 811
 812         if (value > max)
 813                 value = max;
 814
 815         fl_set_slider_value(scrollbar, value);
 816
 817         ScrollCB(scrollbar, 0);
 818         return 0;
 819 }
 820
 821
 822 void BufferView::ScrollUpOnePage(long /*time*/)
 823 {
 824         if (buffer_ == 0) return;
 825         if (!screen) return;
 826
 827         long y = screen->first;
 828
 829         if (!y) return;
 830
 831         Row * row = text->GetRowNearY(y);
 832
 833         y = y - work_area->h + row->height;
 834
 835         fl_set_slider_value(scrollbar, y);
 836
 837         ScrollCB(scrollbar, 0);
 838 }
 839
 840
 841 void BufferView::ScrollDownOnePage(long /*time*/)
 842 {
 843         if (buffer_ == 0) return;
 844         if (!screen) return;
 845
 846         double min, max;
 847         fl_get_slider_bounds(scrollbar, &min, &max);
 848         long y = screen->first;
 849
 850         if (y > text->height - work_area->h)
 851                 return;
 852
 853         y += work_area->h;
 854         text->GetRowNearY(y);
 855
 856         fl_set_slider_value(scrollbar, y);
 857
 858         ScrollCB(scrollbar, 0);
 859 }
 860
 861
 862 int BufferView::work_area_handler(FL_OBJECT * ob, int event,
 863                                   FL_Coord, FL_Coord ,
 864                                   int /*key*/, void * xev)
 865 {
 866         static int x_old = -1;
 867         static int y_old = -1;
 868         static long scrollbar_value_old = -1;
 869
 870         XEvent * ev = static_cast<XEvent*>(xev);
 871         BufferView * view = static_cast<BufferView*>(ob->u_vdata);
 872
 873         // If we don't have a view yet; return
 874         if (!view || quitting) return 0;
 875
 876         switch (event){
 877         case FL_DRAW:
 878                 view->workAreaExpose();
 879                 break;
 880         case FL_PUSH:
 881                 view->WorkAreaButtonPress(ob, 0, 0, 0, ev, 0);
 882                 break;
 883         case FL_RELEASE:
 884                 view->WorkAreaButtonRelease(ob, 0, 0, 0, ev, 0);
 885                 break;
 886         case FL_MOUSE:
 887                 if (ev->xmotion.x != x_old ||
 888                     ev->xmotion.y != y_old ||
 889                     view->current_scrollbar_value != scrollbar_value_old) {
 890                         x_old = ev->xmotion.x;
 891                         y_old = ev->xmotion.y;
 892                         scrollbar_value_old = view->current_scrollbar_value;
 893                         view->WorkAreaMotionNotify(ob, 0, 0, 0, ev, 0);
 894                 }
 895                 break;
 896                 // Done by the raw callback:
 897                 //  case FL_KEYBOARD:
 898                 //  WorkAreaKeyPress(ob, 0, 0, 0, ev, 0); break;
 899         case FL_FOCUS:
 900                 if (!view->owner_->getMiniBuffer()->shows_no_match)
 901                         view->owner_->getMiniBuffer()->Init();
 902                 view->owner_->getMiniBuffer()->shows_no_match = false;
 903                 view->work_area_focus = true;
 904                 fl_set_timer(view->timer_cursor, 0.4);
 905                 break;
 906         case FL_UNFOCUS:
 907                 view->owner_->getMiniBuffer()->ExecCommand();
 908                 view->work_area_focus = false;
 909                 break;
 910         case FL_ENTER:
 911                 SetXtermCursor(view->owner_->getForm()->window);
 912                 // reset the timer
 913                 view->lyx_focus = true;
 914                 fl_set_timer(view->timer_cursor, 0.4);
 915                 break;
 916         case FL_LEAVE:
 917                 if (!input_prohibited)
 918                         XUndefineCursor(fl_display,
 919                                         view->owner_->getForm()->window);
 920                 view->lyx_focus = false; // This is not an absolute truth
 921                 // but if it is not true, it will be changed within a blink
 922                 // of an eye. ... Not good enough... use regulare timeperiod
 923                 //fl_set_timer(view->timer_cursor, 0.01); // 0.1 sec blink
 924                 fl_set_timer(view->timer_cursor, 0.4); // 0.4 sec blink
 925                 break;
 926         case FL_DBLCLICK:
 927                 // select a word
 928                 if (view->buffer_ && !view->buffer_->the_locking_inset) {
 929                         if (view->screen && ev->xbutton.button == 1) {
 930                                 view->screen->HideCursor();
 931                                 view->screen->ToggleSelection();
 932                                 view->text->SelectWord();
 933                                 view->screen->ToggleSelection(false);
 934                                 /* This will fit the cursor on the screen
 935                                  * if necessary */
 936                                 view->update(0);
 937                         }
 938                 }
 939                 break;
 940         case FL_TRPLCLICK:
 941                 // select a line
 942                 if (view->buffer_ && view->screen && ev->xbutton.button == 1) {
 943                         view->screen->HideCursor();
 944                         view->screen->ToggleSelection();
 945                         view->text->CursorHome();
 946                         view->text->sel_cursor = view->text->cursor;
 947                         view->text->CursorEnd();
 948                         view->text->SetSelection();
 949                         view->screen->ToggleSelection(false);
 950                         /* This will fit the cursor on the screen
 951                          * if necessary */
 952                         view->update(0);
 953                 }
 954                 break;
 955         case FL_OTHER:
 956                 view->WorkAreaSelectionNotify(ob,
 957                                               view->owner_->getForm()->window,
 958                                               0, 0, ev, 0);
 959                 break;
 960         }
 961         return 1;
 962 }
 963
 964 int BufferView::WorkAreaMotionNotify(FL_OBJECT * ob, Window,
 965                                      int /*w*/, int /*h*/,
 966                                      XEvent * ev, void * /*d*/)
 967 {
 968         if (buffer_ == 0) return 0;
 969         if (!screen) return 0;
 970
 971         // Check for inset locking
 972         if (buffer_->the_locking_inset) {
 973                 LyXCursor cursor = text->cursor;
 974                 buffer_->the_locking_inset->
 975                         InsetMotionNotify(ev->xbutton.x - ob->x - cursor.x,
 976                                           ev->xbutton.y - ob->y -
 977                                           (cursor.y),
 978                                           ev->xbutton.state);
 979                 return 0;
 980         }
 981
 982         // Only use motion with button 1
 983         if (!ev->xmotion.state & Button1MotionMask)
 984                 return 0;
 985
 986         /* The selection possible is needed, that only motion events are
 987          * used, where the bottom press event was on the drawing area too */
 988         if (selection_possible) {
 989                 screen->HideCursor();
 990
 991                 text->SetCursorFromCoordinates(ev->xbutton.x - ob->x,
 992                                                ev->xbutton.y - ob->y +
 993                                                screen->first);
 994
 995                 if (!text->selection)
 996                         update(-3); // Maybe an empty line was deleted
 997
 998                 text->SetSelection();
 999                 screen->ToggleToggle();
1000                 if (screen->FitCursor())
1001                         updateScrollbar();
1002                 screen->ShowCursor();
1003         }
1004         return 0;
1005 }
1006
1007
1008 extern int bibitemMaxWidth(LyXFont const &);
1009
1010 // Single-click on work area
1011 int BufferView::WorkAreaButtonPress(FL_OBJECT * ob, Window,
1012                                     int /*w*/, int /*h*/,
1013                                     XEvent * ev, void */*d*/)
1014 {
1015         last_click_x = -1;
1016         last_click_y = -1;
1017
1018         if (buffer_ == 0) return 0;
1019         if (!screen) return 0;
1020
1021         int const x = ev->xbutton.x - ob->x;
1022         int const y = ev->xbutton.y - ob->y;
1023         // If we hit an inset, we have the inset coordinates in these
1024         // and inset_hit points to the inset.  If we do not hit an
1025         // inset, inset_hit is 0, and inset_x == x, inset_y == y.
1026         int inset_x = x;
1027         int inset_y = y;
1028         Inset * inset_hit = checkInsetHit(inset_x, inset_y);
1029
1030         // ok ok, this is a hack.
1031         int button = ev->xbutton.button;
1032         if (button == 4 || button == 5) goto wheel;
1033
1034         {
1035
1036                 if (buffer_->the_locking_inset) {
1037                         // We are in inset locking mode
1038
1039                         /* Check whether the inset was hit. If not reset mode,
1040                            otherwise give the event to the inset */
1041                         if (inset_hit != 0) {
1042                                 buffer_->the_locking_inset->
1043                                         InsetButtonPress(inset_x, inset_y,
1044                                                          button);
1045                                 return 0;
1046                         } else {
1047                                 UnlockInset(buffer_->the_locking_inset);
1048                         }
1049                 }
1050
1051                 selection_possible = true;
1052                 screen->HideCursor();
1053
1054                 // Right button mouse click on a table
1055                 if (button == 3 &&
1056                     (text->cursor.par->table ||
1057                      text->MouseHitInTable(x, y + screen->first))) {
1058                         // Set the cursor to the press-position
1059                         text->SetCursorFromCoordinates(x, y + screen->first);
1060                         bool doit = true;
1061
1062                         // Only show the table popup if the hit is in
1063                         // the table, too
1064                         if (!text->HitInTable(text->cursor.row, x))
1065                                 doit = false;
1066
1067                         // Hit above or below the table?
1068                         if (doit) {
1069                                 if (!text->selection) {
1070                                         screen->ToggleSelection();
1071                                         text->ClearSelection();
1072                                         text->FullRebreak();
1073                                         screen->Update();
1074                                         updateScrollbar();
1075                                 }
1076                                 // Popup table popup when on a table.
1077                                 // This is obviously temporary, since we
1078                                 // should be able to popup various
1079                                 // context-sensitive-menus with the
1080                                 // the right mouse. So this should be done more
1081                                 // general in the future. Matthias.
1082                                 selection_possible = false;
1083                                 owner_->getLyXFunc()
1084                                         ->Dispatch(LFUN_LAYOUT_TABLE,
1085                                                    "true");
1086                                 return 0;
1087                         }
1088                 }
1089
1090                 int screen_first = screen->first;
1091
1092                 // Middle button press pastes if we have a selection
1093                 bool paste_internally = false;
1094                 if (button == 2  // && !buffer_->the_locking_inset
1095                     && text->selection) {
1096                         owner_->getLyXFunc()->Dispatch(LFUN_COPY);
1097                         paste_internally = true;
1098                 }
1099
1100                 // Clear the selection
1101                 screen->ToggleSelection();
1102                 text->ClearSelection();
1103                 text->FullRebreak();
1104                 screen->Update();
1105                 updateScrollbar();
1106
1107                 // Single left click in math inset?
1108                 if (inset_hit != 0 && inset_hit->Editable() == 2) {
1109                         // Highly editable inset, like math
1110                         selection_possible = false;
1111                         owner_->updateLayoutChoice();
1112                         owner_->getMiniBuffer()->Set(inset_hit->EditMessage());
1113                         inset_hit->Edit(inset_x, inset_y);
1114                         return 0;
1115                 }
1116
1117                 // Right click on a footnote flag opens float menu
1118                 if (button == 3) {
1119                         selection_possible = false;
1120                         return 0;
1121                 }
1122
1123                 text->SetCursorFromCoordinates(x, y + screen_first);
1124                 text->FinishUndo();
1125                 text->sel_cursor = text->cursor;
1126                 text->cursor.x_fix = text->cursor.x;
1127
1128                 owner_->updateLayoutChoice();
1129                 if (screen->FitCursor()){
1130                         updateScrollbar();
1131                         selection_possible = false;
1132                 }
1133
1134                 // Insert primary selection with middle mouse
1135                 // if there is a local selection in the current buffer,
1136                 // insert this
1137                 if (button == 2) { //  && !buffer_->the_locking_inset){
1138                         if (paste_internally)
1139                                 owner_->getLyXFunc()->Dispatch(LFUN_PASTE);
1140                         else
1141                                 owner_->getLyXFunc()->Dispatch(LFUN_PASTESELECTION,
1142                                                                "paragraph");
1143                         selection_possible = false;
1144                         return 0;
1145                 }
1146         }
1147         goto out;
1148   wheel:
1149         {
1150                 // I am not quite sure if this is the correct place to put
1151                 // this, but it will not cause any harm.
1152                 // Patch from Mark Huang (markman@mit.edu) to make LyX
1153                 // recognise button 4 and 5. This enables LyX use use
1154                 // the scrollwhell on certain mice for something useful. (Lgb)
1155                 // Added wheel acceleration detection code. (Rvdk)
1156                 static Time lastTime = 0;
1157                 int diff = ev->xbutton.time - lastTime;
1158                 int scroll = int(1.0 + (4.0 / (abs(diff) + 1.0)) * 200.0);
1159                 switch (button) {
1160                 case 4:
1161                         ScrollUp(scroll);
1162                         break;
1163                 case 5:
1164                         ScrollDown(scroll);
1165                         break;
1166                 }
1167                 lastTime = ev->xbutton.time;
1168                 return 0;
1169         }
1170   out:
1171         last_click_x = x;
1172         last_click_y = y;
1173
1174         return 0;
1175 }
1176
1177
1178 int BufferView::WorkAreaButtonRelease(FL_OBJECT * ob, Window ,
1179                                       int /*w*/, int /*h*/,
1180                                       XEvent * ev, void * /*d*/)
1181 {
1182         if (buffer_ == 0 || screen == 0) return 0;
1183
1184         int const x = ev->xbutton.x - ob->x;
1185         int const y = ev->xbutton.y - ob->y;
1186
1187         // If we hit an inset, we have the inset coordinates in these
1188         // and inset_hit points to the inset.  If we do not hit an
1189         // inset, inset_hit is 0, and inset_x == x, inset_y == y.
1190         int inset_x = x;
1191         int inset_y = y;
1192         Inset * inset_hit = checkInsetHit(inset_x, inset_y);
1193
1194         if (buffer_->the_locking_inset) {
1195                 // We are in inset locking mode.
1196
1197                 /* LyX does a kind of work-area grabbing for insets.
1198                    Only a ButtonPress Event outside the inset will
1199                    force a InsetUnlock. */
1200                 buffer_->the_locking_inset->
1201                         InsetButtonRelease(inset_x, inset_y,
1202                                            ev->xbutton.button);
1203                 return 0;
1204         }
1205
1206         selection_possible = false;
1207         if (text->cursor.par->table) {
1208                 int cell = text->
1209                         NumberOfCell(text->cursor.par,
1210                                      text->cursor.pos);
1211                 if (text->cursor.par->table->IsContRow(cell) &&
1212                     text->cursor.par->table->
1213                     CellHasContRow(text->cursor.par->table->
1214                                    GetCellAbove(cell))<0) {
1215                         text->CursorUp();
1216                 }
1217         }
1218
1219         if (ev->xbutton.button >= 2)
1220                 return 0;
1221
1222         // Make sure that the press was not far from the release
1223         if ((abs(last_click_x - x) >= 5) ||
1224             (abs(last_click_y - y) >= 5)) {
1225                 return 0;
1226         }
1227
1228         // Did we hit an editable inset?
1229         if (inset_hit != 0) {
1230                 // Inset like error, notes and figures
1231                 selection_possible = false;
1232 #ifdef WITH_WARNINGS
1233 #warning fix this proper in 0.13
1234 #endif
1235                 // Following a ref shouldn't issue
1236                 // a push on the undo-stack
1237                 // anylonger, now that we have
1238                 // keybindings for following
1239                 // references and returning from
1240                 // references.  IMHO though, it
1241                 // should be the inset's own business
1242                 // to push or not push on the undo
1243                 // stack. They don't *have* to
1244                 // alter the document...
1245                 // (Joacim)
1246                 // ...or maybe the SetCursorParUndo()
1247                 // below isn't necessary at all anylonger?
1248                 if (inset_hit->LyxCode() == Inset::REF_CODE) {
1249                         text->SetCursorParUndo();
1250                 }
1251
1252                 owner_->getMiniBuffer()->Set(inset_hit->EditMessage());
1253                 inset_hit->Edit(inset_x, inset_y);
1254                 return 0;
1255         }
1256
1257         // check whether we want to open a float
1258         if (text) {
1259                 bool hit = false;
1260                 char c = ' ';
1261                 if (text->cursor.pos <
1262                     text->cursor.par->Last()) {
1263                         c = text->cursor.par->
1264                                 GetChar(text->cursor.pos);
1265                 }
1266                 if (c == LyXParagraph::META_FOOTNOTE
1267                     || c == LyXParagraph::META_MARGIN
1268                     || c == LyXParagraph::META_FIG
1269                     || c == LyXParagraph::META_TAB
1270                     || c == LyXParagraph::META_WIDE_FIG
1271                     || c == LyXParagraph::META_WIDE_TAB
1272                     || c == LyXParagraph::META_ALGORITHM){
1273                         hit = true;
1274                 } else if (text->cursor.pos - 1 >= 0) {
1275                         c = text->cursor.par->
1276                                 GetChar(text->cursor.pos - 1);
1277                         if (c == LyXParagraph::META_FOOTNOTE
1278                             || c == LyXParagraph::META_MARGIN
1279                             || c == LyXParagraph::META_FIG
1280                             || c == LyXParagraph::META_TAB
1281                             || c == LyXParagraph::META_WIDE_FIG
1282                             || c == LyXParagraph::META_WIDE_TAB
1283                             || c == LyXParagraph::META_ALGORITHM){
1284                                 // We are one step too far to the right
1285                                 text->CursorLeft();
1286                                 hit = true;
1287                         }
1288                 }
1289                 if (hit == true) {
1290                         ToggleFloat();
1291                         selection_possible = false;
1292                         return 0;
1293                 }
1294         }
1295
1296         // Do we want to close a float? (click on the float-label)
1297         if (text->cursor.row->par->footnoteflag ==
1298             LyXParagraph::OPEN_FOOTNOTE
1299             && text->cursor.pos == 0
1300             && text->cursor.row->previous &&
1301             text->cursor.row->previous->par->
1302             footnoteflag != LyXParagraph::OPEN_FOOTNOTE){
1303                 LyXFont font (LyXFont::ALL_SANE);
1304                 font.setSize(LyXFont::SIZE_SMALL);
1305
1306                 int box_x = 20; // LYX_PAPER_MARGIN;
1307                 box_x += font.textWidth("Mwide-figM", 10);
1308
1309                 int screen_first = screen->first;
1310
1311                 if (x < box_x
1312                     && y + screen_first > text->cursor.y -
1313                     text->cursor.row->baseline
1314                     && y + screen_first < text->cursor.y -
1315                     text->cursor.row->baseline
1316                     + font.maxAscent() * 1.2 + font.maxDescent() * 1.2) {
1317                         ToggleFloat();
1318                         selection_possible = false;
1319                         return 0;
1320                 }
1321         }
1322
1323         // Maybe we want to edit a bibitem ale970302
1324         if (text->cursor.par->bibkey && x < 20 +
1325             bibitemMaxWidth(textclasslist
1326                             .TextClass(buffer_->
1327                                        params.textclass).defaultfont())) {
1328                 text->cursor.par->bibkey->Edit(0, 0);
1329         }
1330
1331         return 0;
1332 }
1333
1334
1335 /*
1336  * Returns an inset if inset was hit. 0 otherwise.
1337  * If hit, the coordinates are changed relative to the inset.
1338  * Otherwise coordinates are not changed, and false is returned.
1339  */
1340 Inset * BufferView::checkInsetHit(int & x, int & y)
1341 {
1342         if (!getScreen())
1343                 return 0;
1344
1345         int y_tmp = y + getScreen()->first;
1346
1347         LyXCursor cursor = text->cursor;
1348         if (cursor.pos < cursor.par->Last()
1349             && cursor.par->GetChar(cursor.pos) == LyXParagraph::META_INSET
1350             && cursor.par->GetInset(cursor.pos)
1351             && cursor.par->GetInset(cursor.pos)->Editable()) {
1352
1353                 // Check whether the inset really was hit
1354                 Inset * tmpinset = cursor.par->GetInset(cursor.pos);
1355                 LyXFont font = text->GetFont(cursor.par, cursor.pos);
1356                 if (x > cursor.x
1357                     && x < cursor.x + tmpinset->Width(font)
1358                     && y_tmp > cursor.y - tmpinset->Ascent(font)
1359                     && y_tmp < cursor.y + tmpinset->Descent(font)) {
1360                         x = x - cursor.x;
1361                         // The origin of an inset is on the baseline
1362                         y = y_tmp - (cursor.y);
1363                         return tmpinset;
1364                 }
1365         } else if (cursor.pos - 1 >= 0
1366                    && cursor.par->GetChar(cursor.pos - 1) == LyXParagraph::META_INSET
1367                    && cursor.par->GetInset(cursor.pos - 1)
1368                    && cursor.par->GetInset(cursor.pos - 1)->Editable()) {
1369                 text->CursorLeft();
1370                 Inset * result = checkInsetHit(x, y);
1371                 if (result == 0) {
1372                         text->CursorRight();
1373                         return 0;
1374                 } else {
1375                         return result;
1376                 }
1377         }
1378         return 0;
1379 }
1380
1381
1382 int BufferView::workAreaExpose()
1383 {
1384         if (!work_area || !work_area->form->visible)
1385                 return 1;
1386
1387         // this is a hack to ensure that we only call this through
1388         // BufferView::redraw().
1389         if (!lgb_hack) {
1390                 redraw();
1391         }
1392
1393         static int work_area_width = work_area->w;
1394         static int work_area_height = work_area->h;
1395
1396         bool widthChange = work_area->w != work_area_width;
1397         bool heightChange = work_area->h != work_area_height;
1398
1399         // update from work area
1400         work_area_width = work_area->w;
1401         work_area_height = work_area->h;
1402         if (buffer_ != 0) {
1403                 if (widthChange) {
1404                         // All buffers need a resize
1405                         bufferlist.resize();
1406
1407                         // Remove all texts from the textcache
1408                         showTextCache("Expose delete all");
1409                         while(!textcache.empty()) {
1410                                 LyXText * tt = textcache.front();
1411                                 textcache.erase(textcache.begin());
1412                                 delete tt;
1413                         }
1414                 } else if (heightChange) {
1415                         // Rebuild image of current screen
1416                         updateScreen();
1417                         // fitCursor() ensures we don't jump back
1418                         // to the start of the document on vertical
1419                         // resize
1420                         fitCursor();
1421
1422                         // The main window size has changed, repaint most stuff
1423                         redraw();
1424                         // ...including the minibuffer
1425                         owner_->getMiniBuffer()->Init();
1426
1427                 } else if (screen) screen->Redraw();
1428         } else {
1429                 // Grey box when we don't have a buffer
1430                 fl_winset(FL_ObjWin(work_area));
1431                 fl_rectangle(1, work_area->x, work_area->y,
1432                              work_area->w, work_area->h, FL_GRAY63);
1433         }
1434
1435         // always make sure that the scrollbar is sane.
1436         updateScrollbar();
1437         owner_->updateLayoutChoice();
1438         return 1;
1439 }
1440
1441
1442 // Callback for cursor timer
1443 void BufferView::CursorToggleCB(FL_OBJECT * ob, long)
1444 {
1445         BufferView * view = static_cast<BufferView*>(ob->u_vdata);
1446
1447         // Quite a nice place for asyncron Inset updating, isn't it?
1448         // Actually no! This is run even if no buffer exist... so (Lgb)
1449         if (view && !view->buffer_) {
1450                 goto set_timer_and_return;
1451         }
1452
1453         // NOTE:
1454         // On my quest to solve the gs render hangups I am now
1455         // disabling the SIGHUP completely, and will do a wait
1456         // now and then instead. If the guess that xforms somehow
1457         // destroys something is true, this is likely (hopefully)
1458         // to solve the problem...at least I hope so. Lgb
1459
1460         // ...Ok this seems to work...at least it does not make things
1461         // worse so far. However I still see gs processes that hangs.
1462         // I would really like to know _why_ they are hanging. Anyway
1463         // the solution without the SIGCHLD handler seems to be easier
1464         // to debug.
1465
1466         // When attaching gdb to a a running gs that hangs it shows
1467         // that it is waiting for input(?) Is it possible for us to
1468         // provide that input somehow? Or figure what it is expecing
1469         // to read?
1470
1471         // One solution is to, after some time, look if there are some
1472         // old gs processes still running and if there are: kill them
1473         // and re render.
1474
1475         // Another solution is to provide the user an option to rerender
1476         // a picture. This would, for the picture in question, check if
1477         // there is a gs running for it, if so kill it, and start a new
1478         // rendering process.
1479
1480         // these comments posted to lyx@via
1481         {
1482                 int status = 1;
1483                 int pid = waitpid(static_cast<pid_t>(0), &status, WNOHANG);
1484                 if (pid == -1) // error find out what is wrong
1485                         ; // ignore it for now.
1486                 else if (pid > 0)
1487                         sigchldhandler(pid, &status);
1488         }
1489         if (InsetUpdateList)
1490                 UpdateInsetUpdateList();
1491
1492         if (view && !view->screen){
1493                 goto set_timer_and_return;
1494         }
1495
1496         if (view->lyx_focus && view->work_area_focus) {
1497                 if (!view->buffer_->the_locking_inset) {
1498                         view->screen->CursorToggle();
1499                 } else {
1500                         view->buffer_->the_locking_inset->
1501                                 ToggleInsetCursor();
1502                 }
1503                 goto set_timer_and_return;
1504         } else {
1505                 // Make sure that the cursor is visible.
1506                 if (!view->buffer_->the_locking_inset) {
1507                         view->screen->ShowCursor();
1508                 } else {
1509                         if (!view->buffer_->the_locking_inset->isCursorVisible())
1510                                 view->buffer_->the_locking_inset->
1511                                         ToggleInsetCursor();
1512                 }
1513
1514                 // This is only run when work_area_focus or lyx_focus is false.
1515                 Window tmpwin;
1516                 int tmp;
1517                 XGetInputFocus(fl_display, &tmpwin, &tmp);
1518                 if (lyxerr.debugging(Debug::INFO)) {
1519                         lyxerr << "tmpwin: " << tmpwin
1520                                << "\nwindow: " << view->owner_->getForm()->window
1521                                << "\nwork_area_focus: " << view->work_area_focus
1522                                << "\nlyx_focus      : " << view->lyx_focus
1523                                << endl;
1524                 }
1525                 if (tmpwin != view->owner_->getForm()->window) {
1526                         view->lyx_focus = false;
1527                         goto skip_timer;
1528                 } else {
1529                         view->lyx_focus = true;
1530                         if (!view->work_area_focus)
1531                                 goto skip_timer;
1532                         else
1533                                 goto set_timer_and_return;
1534                 }
1535         }
1536
1537   set_timer_and_return:
1538         fl_set_timer(ob, 0.4);
1539   skip_timer:
1540         return;
1541 }
1542
1543
1544 int BufferView::WorkAreaSelectionNotify(FL_OBJECT *, Window win,
1545                                         int /*w*/, int /*h*/,
1546                                         XEvent * event, void */*d*/)
1547 {
1548         if (buffer_ == 0) return 0;
1549         if (event->type != SelectionNotify)
1550                 return 0;
1551
1552         Atom tmpatom;
1553         unsigned long ul1;
1554         unsigned long ul2;
1555         unsigned char * uc = 0;
1556         int tmpint;
1557         screen->HideCursor();
1558         BeforeChange();
1559         if (event->xselection.type == XA_STRING
1560             && event->xselection.property) {
1561
1562                 if (XGetWindowProperty(
1563                         fl_display            /* display */,
1564                         win /* w */,
1565                         event->xselection.property        /* property */,
1566                         0                /* long_offset */,
1567                         0                /* long_length */,
1568                         false                /* delete */,
1569                         XA_STRING                /* req_type */,
1570                         &tmpatom               /* actual_type_return */,
1571                         &tmpint                /* actual_format_return */,
1572                         &ul1      /* nitems_return */,
1573                         &ul2      /* bytes_after_return */,
1574                         &uc     /* prop_return */
1575                         ) != Success) {
1576                         return 0;
1577                 }
1578                 XFlush(fl_display);
1579
1580                 if (uc) {
1581                         free(uc);
1582                         uc = 0;
1583                 }
1584
1585                 if (XGetWindowProperty(
1586                         fl_display           /* display */,
1587                         win              /* w */,
1588                         event->xselection.property           /* property */,
1589                         0                /* long_offset */,
1590                         ul2/4+1                /* long_length */,
1591                         True                /* delete */,
1592                         XA_STRING                /* req_type */,
1593                         &tmpatom               /* actual_type_return */,
1594                         &tmpint                /* actual_format_return */,
1595                         &ul1      /* nitems_return */,
1596                         &ul2      /* bytes_after_return */,
1597                         &uc     /* prop_return */
1598                         ) != Success) {
1599                         return 0;
1600                 }
1601                 XFlush(fl_display);
1602
1603                 if (uc) {
1604                         if (!ascii_type) {
1605                                 text->InsertStringA(reinterpret_cast<char*>(uc));
1606                         } else {
1607                                 text->InsertStringB(reinterpret_cast<char*>(uc));
1608                         }
1609                         free(uc);
1610                         uc = 0;
1611                 }
1612
1613                 update(1);
1614         }
1615         return 0;
1616 }
1617
1618
1619 void BufferView::cursorPrevious()
1620 {
1621         if (!text->cursor.row->previous) return;
1622
1623         long y = getScreen()->first;
1624         Row * cursorrow = text->cursor.row;
1625         text->SetCursorFromCoordinates(text->cursor.x_fix, y);
1626         text->FinishUndo();
1627         // This is to allow jumping over large insets
1628         if ((cursorrow == text->cursor.row))
1629                 text->CursorUp();
1630
1631         if (text->cursor.row->height < work_area->h)
1632                 getScreen()->Draw(text->cursor.y
1633                                   - text->cursor.row->baseline
1634                                   + text->cursor.row->height
1635                                   - work_area->h +1 );
1636 }
1637
1638
1639 void BufferView::cursorNext()
1640 {
1641         if (!text->cursor.row->next) return;
1642
1643         long y = getScreen()->first;
1644         text->GetRowNearY(y);
1645         Row * cursorrow = text->cursor.row;
1646         text->SetCursorFromCoordinates(text->cursor.x_fix, y + work_area->h);
1647         text->FinishUndo();
1648         // This is to allow jumping over large insets
1649         if ((cursorrow == text->cursor.row))
1650                 text->CursorDown();
1651
1652         if (text->cursor.row->height < work_area->h)
1653                 getScreen()->Draw(text->cursor.y
1654                                   - text->cursor.row->baseline);
1655 }
1656
1657
1658 bool BufferView::available() const
1659 {
1660         if (buffer_ && text) return true;
1661         return false;
1662 }
1663
1664
1665 void BufferView::savePosition()
1666 {
1667         backstack.push(buffer()->fileName(),
1668                        text->cursor.x,
1669                        text->cursor.y);
1670 }
1671
1672
1673 void BufferView::restorePosition()
1674 {
1675         if (backstack.empty()) return;
1676
1677         int  x, y;
1678         string fname = backstack.pop(&x, &y);
1679
1680         BeforeChange();
1681         Buffer * b = bufferlist.exists(fname) ?
1682                 bufferlist.getBuffer(fname) :
1683                 bufferlist.loadLyXFile(fname); // don't ask, just load it
1684         buffer(b);
1685         text->SetCursorFromCoordinates(x, y);
1686         update(0);
1687 }
1688
1689
1690 void BufferView::update(signed char f)
1691 {
1692         owner()->updateLayoutChoice();
1693
1694         if (!text->selection && f > -3)
1695                 text->sel_cursor = text->cursor;
1696
1697         FreeUpdateTimer();
1698         text->FullRebreak();
1699
1700         update();
1701
1702         if (f != 3 && f != -3) {
1703                 fitCursor();
1704                 updateScrollbar();
1705         }
1706
1707         if (f == 1 || f == -1) {
1708                 if (buffer()->isLyxClean()) {
1709                         buffer()->markDirty();
1710                         owner()->getMiniBuffer()->setTimer(4);
1711                 } else {
1712                         buffer()->markDirty();
1713                 }
1714         }
1715 }
1716
1717
1718 void BufferView::smallUpdate(signed char f)
1719 {
1720         getScreen()->SmallUpdate();
1721         if (getScreen()->TopCursorVisible()
1722             != getScreen()->first) {
1723                 update(f);
1724                 return;
1725         }
1726
1727         fitCursor();
1728         updateScrollbar();
1729
1730         if (!text->selection)
1731                 text->sel_cursor = text->cursor;
1732
1733         if (f == 1 || f == -1) {
1734                 if (buffer()->isLyxClean()) {
1735                         buffer()->markDirty();
1736                         owner()->getMiniBuffer()->setTimer(4);
1737                 } else {
1738                         buffer()->markDirty();
1739                 }
1740         }
1741 }