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 using std::for_each;
  16
  17 #include <cstdlib>
  18 #include <csignal>
  19
  20 #include <unistd.h>
  21 #include <sys/wait.h>
  22
  23 #include "support/lstrings.h"
  24
  25 #ifdef __GNUG__
  26 #pragma implementation
  27 #endif
  28
  29 #include "commandtags.h"
  30 #include "BufferView.h"
  31 #include "bufferlist.h"
  32 #include "LyXView.h"
  33 #include "lyxfunc.h"
  34 #include "insets/lyxinset.h"
  35 #include "minibuffer.h"
  36 #include "lyxscreen.h"
  37 #include "up.xpm"
  38 #include "down.xpm"
  39 #include "debug.h"
  40 #include "lyxdraw.h"
  41 #include "lyx_gui_misc.h"
  42 #include "BackStack.h"
  43 #include "lyxtext.h"
  44 #include "lyx_cb.h"
  45 #include "gettext.h"
  46 #include "layout.h"
  47
  48 using std::find_if;
  49
  50 extern BufferList bufferlist;
  51 void sigchldhandler(pid_t pid, int * status);
  52
  53 extern void SetXtermCursor(Window win);
  54 extern bool input_prohibited;
  55 extern bool selection_possible;
  56 extern char ascii_type;
  57 //extern int UnlockInset(UpdatableInset * inset);
  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         the_locking_inset = 0;
  87         inset_slept = false;
  88 }
  89
  90
  91 BufferView::~BufferView()
  92 {
  93         delete text;
  94 }
  95
  96 // This is only the very first implemetation and use of the TextCache,
  97 // operations on it needs to be put into a class or a namespace, that part
  98 // is _NOT_ finished so don't bother to come with too many comments on it
  99 // (unless you have some nice ideas on where/how to do it)
 100 //
 101 // I think we need a TextCache that is common for all BufferViews,
 102 // please tell if you don't agree.
 103 //
 104 // Q. What are we caching?
 105 // A. We are caching the screen representations (LyXText) of the
 106 //    documents (Buffer,LyXParagraph) for specific BufferView widths.
 107 // Q. Why the cache?
 108 // A. It is not really needed, but it speeds things up a lot
 109 //    when you have more than one document loaded at once since a total
 110 //    rebreak (reformatting) need not be done when switching between
 111 //    documents. When the cache is in function a document only needs to be
 112 //    formatted upon loading and when the with of the BufferView changes.
 113 //    Later it will also be unneccessary to reformat when having two
 114 //    BufferViews of equal width with the same document, a simple copy
 115 //    of the LyXText structure will do.
 116 // Invariant for the TextCache:
 117 //        - The buffer of the text  in the TextCache _must_ exists
 118 //          in the bufferlist.
 119 //        - For a text in the TextCache there _must not_ be an equivalent
 120 //          text in any BufferView. (same buffer and width).
 121 // Among others this mean:
 122 //        - When a document is closed all trace of it must be removed from
 123 //          the TextCache.
 124 // Scenarios:
 125 //    I believe there are only three possible scenarios where the two first
 126 //    are also covered by the third.
 127 //        - The simplest scenario is what we have now, a single
 128 //          BufferView only.
 129 //          o Opening
 130 //            Nothing to do with the TextCache is done when opening a file.
 131 //          o Switching
 132 //            We switch from buffer A to buffer B.
 133 //            * A's text is cached in TextCache.
 134 //            * We make a search for a text in TextCache that fits B
 135 //              (same buffer and same width).
 136 //          o Horizontal resize
 137 //            If the BufferView's width (LyXView) is horizontally changed all
 138 //            the entries in the TextCache are deleted. (This causes
 139 //            reformat of all loaded documents when next viewed)
 140 //          o Close
 141 //            When a buffer is closed we don't have to do anything, because
 142 //            to close a single buffer it is required to only exist in the
 143 //            BufferView and not in the TextCache. Upon LFUN_QUIT we
 144 //            don't really care since everything is deleted anyway.
 145 //        - The next scenario is when we have several BufferViews (in one or
 146 //          more LyXViews) of equal width.
 147 //          o Opening
 148 //            Nothing to do with the TextCache is done when opening a file.
 149 //          o Switching
 150 //            We switch from buffer A to buffer B.
 151 //            * If A is in another Bufferview we do not put it into TextCache.
 152 //              else we put A into TextCache.
 153 //            * If B is viewed in another BufferView we make a copy of its
 154 //              text and use that, else we search in TextCache for a match.
 155 //              (same buffer same width)
 156 //          o Horizontal resize
 157 //            If the BufferView's width (LyXView) is horisontaly changed all
 158 //            the entries in the TextCache is deleted. (This causes
 159 //            reformat of all loaded documents when next viewed)
 160 //          o Close
 161 //        - The last scenario should cover both the previous ones, this time
 162 //          we have several BufferViews (in one or more LyXViews) with no
 163 //          limitations on width. (And if you wonder why the two other
 164 //          senarios are needed... I used them to get to this one.)
 165 //          o Opening
 166 //            Nothing to do with the TextCache is done when opening a file.
 167 //          o Switching
 168 //            We switch from buffer A to buffer B.
 169 //          o Horisontal rezize
 170 //          o Close
 171
 172 typedef vector<LyXText*> TextCache;
 173 TextCache textcache;
 174
 175 class text_fits {
 176 public:
 177         text_fits(Buffer * b, unsigned short p)
 178                 : buf(b), pw(p) {}
 179         bool operator()(TextCache::value_type & vt) {
 180                 if (vt->params == buf && vt->paperWidth() == pw) return true;
 181                 return false;
 182         }
 183 private:
 184         Buffer * buf;
 185         unsigned short pw;
 186 };
 187
 188
 189 class show_text {
 190 public:
 191         show_text(ostream & o) : os(o) {}
 192         void operator()(TextCache::value_type & vt) {
 193                 os << "Buffer: " << vt->params
 194                    << "\nWidth: " << vt->paperWidth() << endl;
 195         }
 196 private:
 197         ostream & os;
 198 };
 199
 200 void showTextCache(string const & str)
 201 {
 202         lyxerr << "TextCache: " << str << endl;
 203         for_each(textcache.begin(), textcache.end(), show_text(lyxerr));
 204 }
 205
 206
 207 void BufferView::buffer(Buffer * b)
 208 {
 209         lyxerr[Debug::INFO] << "Setting buffer in BufferView" << endl;
 210         if (buffer_) {
 211                 insetSleep();
 212                 buffer_->delUser(this);
 213                 // Put the old text into the TextCache.
 214                 textcache.push_back(text);
 215                 if (lyxerr.debugging())
 216                         showTextCache("buffer");
 217                 // delete text;
 218                 text = 0;
 219         }
 220
 221         // Set current buffer
 222         buffer_ = b;
 223
 224         if (bufferlist.getState() == BufferList::CLOSING) return;
 225
 226         // Nuke old image
 227         // screen is always deleted when the buffer is changed.
 228         if (screen) // DEL LINE
 229                 delete screen;
 230         screen = 0;
 231
 232         // If we are closing the buffer, use the first buffer as current
 233         if (!buffer_) {
 234                 buffer_ = bufferlist.first();
 235         }
 236
 237         if (buffer_) {
 238                 lyxerr[Debug::INFO] << "  Buffer addr: " << buffer_ << endl;
 239                 buffer_->addUser(this);
 240                 owner_->getMenus()->showMenus();
 241                 // If we don't have a text object for this, we make one
 242                 if (text == 0)
 243                         resizeCurrentBuffer();
 244                 else {
 245                         updateScreen();
 246                         updateScrollbar();
 247                 }
 248                 screen->first = screen->TopCursorVisible();
 249                 redraw();
 250                 updateAllVisibleBufferRelatedPopups();
 251                 insetWakeup();
 252         } else {
 253                 lyxerr[Debug::INFO] << "  No Buffer!" << endl;
 254                 owner_->getMenus()->hideMenus();
 255                 updateScrollbar();
 256                 fl_redraw_object(work_area);
 257                 // Also remove all remaining text's from the testcache.
 258                 if (lyxerr.debugging())
 259                         showTextCache("buffer delete all");
 260                 while (!textcache.empty()) {
 261                         LyXText * tt = textcache.front();
 262                         textcache.erase(textcache.begin());
 263                         delete tt;
 264                 }
 265         }
 266         // should update layoutchoice even if we don't have a buffer.
 267         owner_->updateLayoutChoice();
 268         owner_->getMiniBuffer()->Init();
 269         owner_->updateWindowTitle();
 270 }
 271
 272
 273 void BufferView::updateScreen()
 274 {
 275         // Regenerate the screen.
 276         if (screen) // DEL LINE
 277                 delete screen;
 278         screen = new LyXScreen(FL_ObjWin(work_area),
 279                                work_area->w,
 280                                work_area->h,
 281                                work_area->x,
 282                                work_area->y,
 283                                text);
 284 }
 285
 286
 287 void BufferView::resize()
 288 {
 289         // This will resize the buffer. (Asger)
 290         if (buffer_)
 291                 resizeCurrentBuffer();
 292 }
 293
 294
 295 static bool lgb_hack = false;
 296
 297 void BufferView::redraw()
 298 {
 299         lyxerr[Debug::INFO] << "BufferView::redraw()" << endl;
 300         lgb_hack = true;
 301         fl_redraw_object(work_area);
 302         fl_redraw_object(scrollbar);
 303         fl_redraw_object(button_down);
 304         fl_redraw_object(button_up);
 305         lgb_hack = false;
 306 }
 307
 308
 309 void BufferView::fitCursor()
 310 {
 311         if (screen) screen->FitCursor();
 312 }
 313
 314
 315 void BufferView::update()
 316 {
 317         if (screen) screen->Update();
 318 }
 319
 320
 321 void BufferView::updateScrollbar()
 322 {
 323         /* If the text is smaller than the working area, the scrollbar
 324          * maximum must be the working area height. No scrolling will
 325          * be possible */
 326
 327         if (!buffer_) {
 328                 fl_set_slider_value(scrollbar, 0);
 329                 fl_set_slider_size(scrollbar, scrollbar->h);
 330                 return;
 331         }
 332
 333         static long max2 = 0;
 334         static long height2 = 0;
 335
 336         long cbth = 0;
 337         long cbsf = 0;
 338
 339         if (text)
 340                 cbth = text->height;
 341         if (screen)
 342                 cbsf = screen->first;
 343
 344         // check if anything has changed.
 345         if (max2 == cbth &&
 346             height2 == work_area->h &&
 347             current_scrollbar_value == cbsf)
 348                 return;       // no
 349
 350         max2 = cbth;
 351         height2 = work_area->h;
 352         current_scrollbar_value = cbsf;
 353
 354         if (cbth <= height2) { // text is smaller than screen
 355                 fl_set_slider_size(scrollbar, scrollbar->h);
 356                 return;
 357         }
 358
 359         long maximum_height = work_area->h * 3 / 4 + cbth;
 360         long value = cbsf;
 361
 362         // set the scrollbar
 363         double hfloat = work_area->h;
 364         double maxfloat = maximum_height;
 365
 366         fl_set_slider_value(scrollbar, value);
 367         fl_set_slider_bounds(scrollbar, 0,
 368                              maximum_height - work_area->h);
 369 #if FL_REVISION > 85
 370         double lineh = text->DefaultHeight();
 371         fl_set_slider_increment(scrollbar, work_area->h-lineh, lineh);
 372 #endif
 373         if (maxfloat > 0){
 374                 if ((hfloat / maxfloat) * float(height2) < 3)
 375                         fl_set_slider_size(scrollbar,
 376                                            3 / float(height2));
 377                 else
 378                         fl_set_slider_size(scrollbar,
 379                                            hfloat / maxfloat);
 380         } else
 381                 fl_set_slider_size(scrollbar, hfloat);
 382         fl_set_slider_precision(scrollbar, 0);
 383 }
 384
 385
 386 void BufferView::redoCurrentBuffer()
 387 {
 388         lyxerr[Debug::INFO] << "BufferView::redoCurrentBuffer" << endl;
 389         if (buffer_ && text) {
 390                 resize();
 391                 owner_->updateLayoutChoice();
 392         }
 393 }
 394
 395
 396 int BufferView::resizeCurrentBuffer()
 397 {
 398         lyxerr[Debug::INFO] << "resizeCurrentBuffer" << endl;
 399
 400         LyXParagraph * par = 0;
 401         LyXParagraph * selstartpar = 0;
 402         LyXParagraph * selendpar = 0;
 403         int pos = 0;
 404         int selstartpos = 0;
 405         int selendpos = 0;
 406         int selection = 0;
 407         int mark_set = 0;
 408
 409         ProhibitInput();
 410
 411         owner_->getMiniBuffer()->Set(_("Formatting document..."));
 412
 413         if (text) {
 414                 par = text->cursor.par;
 415                 pos = text->cursor.pos;
 416                 selstartpar = text->sel_start_cursor.par;
 417                 selstartpos = text->sel_start_cursor.pos;
 418                 selendpar = text->sel_end_cursor.par;
 419                 selendpos = text->sel_end_cursor.pos;
 420                 selection = text->selection;
 421                 mark_set = text->mark_set;
 422                 delete text;
 423                 text = new LyXText(work_area->w, buffer_);
 424         } else {
 425                 // See if we have a text in TextCache that fits
 426                 // the new buffer_ with the correct width.
 427                 TextCache::iterator it =
 428                         find_if(textcache.begin(),
 429                                 textcache.end(),
 430                                 text_fits(buffer_,
 431                                           work_area->w));
 432                 if (it != textcache.end()) {
 433                         text = *it;
 434                         // take it out of textcache.
 435                         textcache.erase(it);
 436                         if (lyxerr.debugging())
 437                                 showTextCache("resizeCurrentBuffer");
 438                 } else {
 439                         text = new LyXText(work_area->w, buffer_);
 440                 }
 441         }
 442         updateScreen();
 443
 444         if (par) {
 445                 text->selection = true;
 446                 /* at this point just to avoid the Delete-Empty-Paragraph
 447                  * Mechanism when setting the cursor */
 448                 text->mark_set = mark_set;
 449                 if (selection) {
 450                         text->SetCursor(selstartpar, selstartpos);
 451                         text->sel_cursor = text->cursor;
 452                         text->SetCursor(selendpar, selendpos);
 453                         text->SetSelection();
 454                         text->SetCursor(par, pos);
 455                 } else {
 456                         text->SetCursor(par, pos);
 457                         text->sel_cursor = text->cursor;
 458                         text->selection = false;
 459                 }
 460         }
 461         screen->first = screen->TopCursorVisible(); /* this will scroll the
 462                                                      * screen such that the
 463                                                      * cursor becomes
 464                                                      * visible */
 465         updateScrollbar();
 466         redraw();
 467         owner_->getMiniBuffer()->Init();
 468         AllowInput();
 469
 470         // Now if the title form still exist kill it
 471         TimerCB(0, 0);
 472
 473         return 0;
 474 }
 475
 476
 477 void BufferView::gotoError()
 478 {
 479         if (!screen)
 480                 return;
 481
 482         screen->HideCursor();
 483         beforeChange();
 484         update(-2);
 485         LyXCursor tmp;
 486
 487         if (!text->GotoNextError()) {
 488                 if (text->cursor.pos
 489                     || text->cursor.par != text->FirstParagraph()) {
 490                         tmp = text->cursor;
 491                         text->cursor.par = text->FirstParagraph();
 492                         text->cursor.pos = 0;
 493                         if (!text->GotoNextError()) {
 494                                 text->cursor = tmp;
 495                                 owner_->getMiniBuffer()
 496                                         ->Set(_("No more errors"));
 497                                 LyXBell();
 498                         }
 499                 } else {
 500                         owner_->getMiniBuffer()->Set(_("No more errors"));
 501                         LyXBell();
 502                 }
 503         }
 504         update(0);
 505         text->sel_cursor = text->cursor;
 506 }
 507
 508
 509 extern "C" {
 510 // Just a bunch of C wrappers around static members of BufferView
 511         void C_BufferView_UpCB(FL_OBJECT * ob, long buf)
 512         {
 513                 BufferView::UpCB(ob, buf);
 514         }
 515
 516
 517         void C_BufferView_DownCB(FL_OBJECT * ob, long buf)
 518         {
 519                 BufferView::DownCB(ob, buf);
 520         }
 521
 522
 523         void C_BufferView_ScrollCB(FL_OBJECT * ob, long buf)
 524         {
 525                 BufferView::ScrollCB(ob, buf);
 526         }
 527
 528
 529         void C_BufferView_CursorToggleCB(FL_OBJECT * ob, long buf)
 530         {
 531                 BufferView::CursorToggleCB(ob, buf);
 532         }
 533
 534
 535         int C_BufferView_work_area_handler(FL_OBJECT * ob, int event,
 536                                            FL_Coord, FL_Coord,
 537                                            int key, void * xev)
 538         {
 539                 return BufferView::work_area_handler(ob, event,
 540                                                      0, 0, key, xev);
 541         }
 542 }
 543
 544
 545 void BufferView::create_view(int xpos, int ypos, int width, int height)
 546 {
 547         FL_OBJECT * obj;
 548         int const bw = abs(fl_get_border_width());
 549
 550         // a hack for the figinsets (Matthias)
 551         // This one first, then it will probably be invisible. (Lgb)
 552         ::figinset_canvas = figinset_canvas = obj =
 553                   fl_add_canvas(FL_NORMAL_CANVAS,
 554                                 xpos + 1,
 555                                 ypos + 1, 1, 1, "");
 556         fl_set_object_boxtype(obj, FL_NO_BOX);
 557         fl_set_object_resize(obj, FL_RESIZE_ALL);
 558         fl_set_object_gravity(obj, NorthWestGravity, NorthWestGravity);
 559
 560         // a box
 561         obj = fl_add_box(FL_BORDER_BOX, xpos, ypos,
 562                          width - 15,
 563                          height, "");
 564         fl_set_object_resize(obj, FL_RESIZE_ALL);
 565         fl_set_object_gravity(obj, NorthWestGravity, SouthEastGravity);
 566
 567         // the free object
 568         work_area = obj = fl_add_free(FL_INPUT_FREE,
 569                                       xpos + bw, ypos + bw,
 570                                       width - 15 - 2 * bw /* scrollbarwidth */,
 571                                       height - 2 * bw, "",
 572                                       C_BufferView_work_area_handler);
 573         obj->wantkey = FL_KEY_TAB;
 574         obj->u_vdata = this; /* This is how we pass the BufferView
 575                                 to the work_area_handler. */
 576         fl_set_object_boxtype(obj, FL_DOWN_BOX);
 577         fl_set_object_resize(obj, FL_RESIZE_ALL);
 578         fl_set_object_gravity(obj, NorthWestGravity, SouthEastGravity);
 579
 580         //
 581         // THE SCROLLBAR
 582         //
 583
 584         // up - scrollbar button
 585 #if FL_REVISION > 85
 586         fl_set_border_width(-1);
 587 #else
 588         fl_set_border_width(-2); // to get visible feedback
 589 #endif
 590         button_up = obj = fl_add_pixmapbutton(FL_TOUCH_BUTTON,
 591                                               width - 15 + 4 * bw,
 592                                               ypos,
 593                                               15, 15, "");
 594         fl_set_object_boxtype(obj, FL_UP_BOX);
 595         fl_set_object_color(obj, FL_MCOL, FL_BLUE);
 596         fl_set_object_resize(obj, FL_RESIZE_ALL);
 597         fl_set_object_gravity(obj, NorthEastGravity, NorthEastGravity);
 598         fl_set_object_callback(obj, C_BufferView_UpCB, 0);
 599         obj->u_vdata = this;
 600         fl_set_pixmapbutton_data(obj, const_cast<char**>(up_xpm));
 601
 602 #if FL_REVISION > 85
 603         // Remove the blue feedback rectangle
 604         fl_set_pixmapbutton_focus_outline(obj, 0);
 605 #endif
 606
 607         // the scrollbar slider
 608         fl_set_border_width(-bw);
 609         scrollbar = obj = fl_add_slider(FL_VERT_SLIDER,
 610                                         width - 15 + 4 * bw,
 611                                         ypos + 15,
 612                                         15, height - 30, "");
 613         fl_set_object_color(obj, FL_COL1, FL_MCOL);
 614         fl_set_object_boxtype(obj, FL_UP_BOX);
 615         fl_set_object_resize(obj, FL_RESIZE_ALL);
 616         fl_set_object_gravity(obj, NorthEastGravity, SouthEastGravity);
 617         fl_set_object_callback(obj, C_BufferView_ScrollCB, 0);
 618         obj->u_vdata = this;
 619
 620         // down - scrollbar button
 621 #if FL_REVISION > 85
 622         fl_set_border_width(-1);
 623 #else
 624         fl_set_border_width(-2); // to get visible feedback
 625 #endif
 626         button_down = obj = fl_add_pixmapbutton(FL_TOUCH_BUTTON,
 627                                                 width - 15 + 4 * bw,
 628                                                 ypos + height - 15,
 629                                                 15, 15, "");
 630         fl_set_object_boxtype(obj, FL_UP_BOX);
 631         fl_set_object_color(obj, FL_MCOL, FL_BLUE);
 632         fl_set_object_resize(obj, FL_RESIZE_ALL);
 633         fl_set_object_gravity(obj, SouthEastGravity, SouthEastGravity);
 634         fl_set_object_callback(obj, C_BufferView_DownCB, 0);
 635         obj->u_vdata = this;
 636         fl_set_pixmapbutton_data(obj, const_cast<char**>(down_xpm));
 637         fl_set_border_width(-bw);
 638
 639 #if FL_REVISION > 85
 640         // Remove the blue feedback rectangle
 641         fl_set_pixmapbutton_focus_outline(obj, 0);
 642 #endif
 643
 644         //
 645         // TIMERS
 646         //
 647
 648         // timer_cursor
 649         timer_cursor = obj = fl_add_timer(FL_HIDDEN_TIMER,
 650                                           0, 0, 0, 0, "Timer");
 651         fl_set_object_callback(obj, C_BufferView_CursorToggleCB, 0);
 652         obj->u_vdata = this;
 653 }
 654
 655
 656 // Callback for scrollbar up button
 657 void BufferView::UpCB(FL_OBJECT * ob, long)
 658 {
 659         BufferView * view = static_cast<BufferView*>(ob->u_vdata);
 660
 661         if (view->buffer_ == 0) return;
 662
 663         static long time = 0;
 664         XEvent const * ev2 = fl_last_event();
 665         if (ev2->type == ButtonPress || ev2->type == ButtonRelease)
 666                 time = 0;
 667         int button = fl_get_button_numb(ob);
 668         switch (button) {
 669         case 3:
 670                 view->ScrollUpOnePage(time++); break;
 671         case 2:
 672                 view->ScrollDownOnePage(time++); break;
 673         default:
 674                 view->ScrollUp(time++); break;
 675         }
 676 }
 677
 678
 679 static
 680 void waitForX()
 681 {
 682 #if 0
 683         static Window w = 0;
 684         static Atom a = 0;
 685         if (!a)
 686                 a = XInternAtom(fl_display, "WAIT_FOR_X", False);
 687         if (w == 0) {
 688                 int mask;
 689                 XSetWindowAttributes attr;
 690                 mask = CWOverrideRedirect;
 691                 attr.override_redirect = 1;
 692                 w = XCreateWindow(fl_display, fl_root,
 693                                   0, 0, 1, 1, 0, CopyFromParent,
 694                                   InputOnly, CopyFromParent, mask, &attr);
 695                 XSelectInput(fl_display, w, PropertyChangeMask);
 696                 XMapWindow(fl_display, w);
 697         }
 698         static XEvent ev;
 699         XChangeProperty(fl_display, w, a, a, 8,
 700                         PropModeAppend,
 701                         reinterpret_cast<unsigned char*>(""), 0);
 702         XWindowEvent(fl_display, w, PropertyChangeMask, &ev);
 703 #endif
 704         XSync(fl_get_display(), 0);
 705 }
 706
 707
 708 // Callback for scrollbar slider
 709 void BufferView::ScrollCB(FL_OBJECT * ob, long)
 710 {
 711         BufferView * view = static_cast<BufferView*>(ob->u_vdata);
 712         extern bool cursor_follows_scrollbar;
 713
 714         if (view->buffer_ == 0) return;
 715
 716         view->current_scrollbar_value = long(fl_get_slider_value(ob));
 717         if (view->current_scrollbar_value < 0)
 718                 view->current_scrollbar_value = 0;
 719
 720         if (!view->screen)
 721                 return;
 722
 723         view->screen->Draw(view->current_scrollbar_value);
 724
 725         if (cursor_follows_scrollbar) {
 726                 LyXText * vbt = view->text;
 727                 int height = vbt->DefaultHeight();
 728
 729                 if (vbt->cursor.y < view->screen->first + height) {
 730                         vbt->SetCursorFromCoordinates(0,
 731                                                       view->screen->first +
 732                                                       height);
 733                 }
 734                 else if (vbt->cursor.y >
 735                          view->screen->first + view->work_area->h - height) {
 736                         vbt->SetCursorFromCoordinates(0,
 737                                                       view->screen->first +
 738                                                       view->work_area->h  -
 739                                                       height);
 740                 }
 741         }
 742         waitForX();
 743 }
 744
 745
 746 // Callback for scrollbar down button
 747 void BufferView::DownCB(FL_OBJECT * ob, long)
 748 {
 749         BufferView * view = static_cast<BufferView*>(ob->u_vdata);
 750
 751         if (view->buffer_ == 0) return;
 752
 753         XEvent const * ev2;
 754         static long time = 0;
 755         ev2 = fl_last_event();
 756         if (ev2->type == ButtonPress || ev2->type == ButtonRelease)
 757                 time = 0;
 758         int button = fl_get_button_numb(ob);
 759         switch (button) {
 760         case 2:
 761                 view->ScrollUpOnePage(time++); break;
 762         case 3:
 763                 view->ScrollDownOnePage(time++); break;
 764         default:
 765                 view->ScrollDown(time++); break;
 766         }
 767 }
 768
 769
 770 int BufferView::ScrollUp(long time)
 771 {
 772         if (buffer_ == 0) return 0;
 773         if (!screen) return 0;
 774
 775         double value = fl_get_slider_value(scrollbar);
 776
 777         if (value == 0) return 0;
 778
 779         float add_value =  (text->DefaultHeight()
 780                             + float(time) * float(time) * 0.125);
 781
 782         if (add_value > work_area->h)
 783                 add_value = float(work_area->h -
 784                                   text->DefaultHeight());
 785
 786         value -= add_value;
 787
 788         if (value < 0)
 789                 value = 0;
 790
 791         fl_set_slider_value(scrollbar, value);
 792
 793         ScrollCB(scrollbar, 0);
 794         return 0;
 795 }
 796
 797
 798 int BufferView::ScrollDown(long time)
 799 {
 800         if (buffer_ == 0) return 0;
 801         if (!screen) return 0;
 802
 803         double value= fl_get_slider_value(scrollbar);
 804         double min, max;
 805         fl_get_slider_bounds(scrollbar, &min, &max);
 806
 807         if (value == max) return 0;
 808
 809         float add_value =  (text->DefaultHeight()
 810                             + float(time) * float(time) * 0.125);
 811
 812         if (add_value > work_area->h)
 813                 add_value = float(work_area->h -
 814                                   text->DefaultHeight());
 815
 816         value += add_value;
 817
 818         if (value > max)
 819                 value = max;
 820
 821         fl_set_slider_value(scrollbar, value);
 822
 823         ScrollCB(scrollbar, 0);
 824         return 0;
 825 }
 826
 827
 828 void BufferView::ScrollUpOnePage(long /*time*/)
 829 {
 830         if (buffer_ == 0) return;
 831         if (!screen) return;
 832
 833         long y = screen->first;
 834
 835         if (!y) return;
 836
 837         Row * row = text->GetRowNearY(y);
 838
 839         y = y - work_area->h + row->height;
 840
 841         fl_set_slider_value(scrollbar, y);
 842
 843         ScrollCB(scrollbar, 0);
 844 }
 845
 846
 847 void BufferView::ScrollDownOnePage(long /*time*/)
 848 {
 849         if (buffer_ == 0) return;
 850         if (!screen) return;
 851
 852         double min, max;
 853         fl_get_slider_bounds(scrollbar, &min, &max);
 854         long y = screen->first;
 855
 856         if (y > text->height - work_area->h)
 857                 return;
 858
 859         y += work_area->h;
 860         text->GetRowNearY(y);
 861
 862         fl_set_slider_value(scrollbar, y);
 863
 864         ScrollCB(scrollbar, 0);
 865 }
 866
 867
 868 int BufferView::work_area_handler(FL_OBJECT * ob, int event,
 869                                   FL_Coord, FL_Coord ,
 870                                   int /*key*/, void * xev)
 871 {
 872         static int x_old = -1;
 873         static int y_old = -1;
 874         static long scrollbar_value_old = -1;
 875
 876         XEvent * ev = static_cast<XEvent*>(xev);
 877         BufferView * view = static_cast<BufferView*>(ob->u_vdata);
 878
 879         // If we don't have a view yet; return
 880         if (!view || quitting) return 0;
 881
 882         switch (event){
 883         case FL_DRAW:
 884                 view->workAreaExpose();
 885                 break;
 886         case FL_PUSH:
 887                 view->WorkAreaButtonPress(ob, 0, 0, 0, ev, 0);
 888                 break;
 889         case FL_RELEASE:
 890                 view->WorkAreaButtonRelease(ob, 0, 0, 0, ev, 0);
 891                 break;
 892         case FL_MOUSE:
 893                 if (ev->xmotion.x != x_old ||
 894                     ev->xmotion.y != y_old ||
 895                     view->current_scrollbar_value != scrollbar_value_old) {
 896                         x_old = ev->xmotion.x;
 897                         y_old = ev->xmotion.y;
 898                         scrollbar_value_old = view->current_scrollbar_value;
 899                         view->WorkAreaMotionNotify(ob, 0, 0, 0, ev, 0);
 900                 }
 901                 break;
 902                 // Done by the raw callback:
 903                 //  case FL_KEYBOARD:
 904                 //  WorkAreaKeyPress(ob, 0, 0, 0, ev, 0); break;
 905         case FL_FOCUS:
 906                 if (!view->owner_->getMiniBuffer()->shows_no_match)
 907                         view->owner_->getMiniBuffer()->Init();
 908                 view->owner_->getMiniBuffer()->shows_no_match = false;
 909                 view->work_area_focus = true;
 910                 fl_set_timer(view->timer_cursor, 0.4);
 911                 break;
 912         case FL_UNFOCUS:
 913                 view->owner_->getMiniBuffer()->ExecCommand();
 914                 view->work_area_focus = false;
 915                 break;
 916         case FL_ENTER:
 917                 SetXtermCursor(view->owner_->getForm()->window);
 918                 // reset the timer
 919                 view->lyx_focus = true;
 920                 fl_set_timer(view->timer_cursor, 0.4);
 921                 break;
 922         case FL_LEAVE:
 923                 if (!input_prohibited)
 924                         XUndefineCursor(fl_display,
 925                                         view->owner_->getForm()->window);
 926                 view->lyx_focus = false; // This is not an absolute truth
 927                 // but if it is not true, it will be changed within a blink
 928                 // of an eye. ... Not good enough... use regulare timeperiod
 929                 //fl_set_timer(view->timer_cursor, 0.01); // 0.1 sec blink
 930                 fl_set_timer(view->timer_cursor, 0.4); // 0.4 sec blink
 931                 break;
 932         case FL_DBLCLICK:
 933                 // select a word
 934                 if (!view->the_locking_inset) {
 935                         if (view->screen && ev->xbutton.button == 1) {
 936                                 view->screen->HideCursor();
 937                                 view->screen->ToggleSelection();
 938                                 view->text->SelectWord();
 939                                 view->screen->ToggleSelection(false);
 940                                 /* This will fit the cursor on the screen
 941                                  * if necessary */
 942                                 view->update(0);
 943                         }
 944                 }
 945                 break;
 946         case FL_TRPLCLICK:
 947                 // select a line
 948                 if (view->buffer_ && view->screen && ev->xbutton.button == 1) {
 949                         view->screen->HideCursor();
 950                         view->screen->ToggleSelection();
 951                         view->text->CursorHome();
 952                         view->text->sel_cursor = view->text->cursor;
 953                         view->text->CursorEnd();
 954                         view->text->SetSelection();
 955                         view->screen->ToggleSelection(false);
 956                         /* This will fit the cursor on the screen
 957                          * if necessary */
 958                         view->update(0);
 959                 }
 960                 break;
 961         case FL_OTHER:
 962                 view->WorkAreaSelectionNotify(ob,
 963                                               view->owner_->getForm()->window,
 964                                               0, 0, ev, 0);
 965                 break;
 966         }
 967         return 1;
 968 }
 969
 970 int BufferView::WorkAreaMotionNotify(FL_OBJECT * ob, Window,
 971                                      int /*w*/, int /*h*/,
 972                                      XEvent * ev, void * /*d*/)
 973 {
 974         if (buffer_ == 0) return 0;
 975         if (!screen) return 0;
 976
 977         // Check for inset locking
 978         if (the_locking_inset) {
 979                 LyXCursor cursor = text->cursor;
 980                 the_locking_inset->
 981                         InsetMotionNotify(ev->xbutton.x - ob->x - cursor.x,
 982                                           ev->xbutton.y - ob->y -
 983                                           (cursor.y),
 984                                           ev->xbutton.state);
 985                 return 0;
 986         }
 987
 988         // Only use motion with button 1
 989         if (!ev->xmotion.state & Button1MotionMask)
 990                 return 0;
 991
 992         /* The selection possible is needed, that only motion events are
 993          * used, where the bottom press event was on the drawing area too */
 994         if (selection_possible) {
 995                 screen->HideCursor();
 996
 997                 text->SetCursorFromCoordinates(ev->xbutton.x - ob->x,
 998                                                ev->xbutton.y - ob->y +
 999                                                screen->first);
1000
1001                 if (!text->selection)
1002                         update(-3); // Maybe an empty line was deleted
1003
1004                 text->SetSelection();
1005                 screen->ToggleToggle();
1006                 if (screen->FitCursor())
1007                         updateScrollbar();
1008                 screen->ShowCursor();
1009         }
1010         return 0;
1011 }
1012
1013
1014 extern int bibitemMaxWidth(LyXFont const &);
1015
1016 // Single-click on work area
1017 int BufferView::WorkAreaButtonPress(FL_OBJECT * ob, Window,
1018                                     int /*w*/, int /*h*/,
1019                                     XEvent * ev, void */*d*/)
1020 {
1021         last_click_x = -1;
1022         last_click_y = -1;
1023
1024         if (buffer_ == 0) return 0;
1025         if (!screen) return 0;
1026
1027         int const x = ev->xbutton.x - ob->x;
1028         int const y = ev->xbutton.y - ob->y;
1029         // If we hit an inset, we have the inset coordinates in these
1030         // and inset_hit points to the inset.  If we do not hit an
1031         // inset, inset_hit is 0, and inset_x == x, inset_y == y.
1032         int inset_x = x;
1033         int inset_y = y;
1034         Inset * inset_hit = checkInsetHit(inset_x, inset_y);
1035
1036         // ok ok, this is a hack.
1037         int button = ev->xbutton.button;
1038         if (button == 4 || button == 5) goto wheel;
1039
1040         {
1041                 if (the_locking_inset) {
1042                         // We are in inset locking mode
1043
1044                         /* Check whether the inset was hit. If not reset mode,
1045                            otherwise give the event to the inset */
1046                         if (inset_hit != 0) {
1047                                 the_locking_inset->
1048                                         InsetButtonPress(inset_x, inset_y,
1049                                                          button);
1050                                 return 0;
1051                         } else {
1052                                 unlockInset(the_locking_inset);
1053                         }
1054                 }
1055
1056                 selection_possible = true;
1057                 screen->HideCursor();
1058
1059                 // Right button mouse click on a table
1060                 if (button == 3 &&
1061                     (text->cursor.par->table ||
1062                      text->MouseHitInTable(x, y + screen->first))) {
1063                         // Set the cursor to the press-position
1064                         text->SetCursorFromCoordinates(x, y + screen->first);
1065                         bool doit = true;
1066
1067                         // Only show the table popup if the hit is in
1068                         // the table, too
1069                         if (!text->HitInTable(text->cursor.row, x))
1070                                 doit = false;
1071
1072                         // Hit above or below the table?
1073                         if (doit) {
1074                                 if (!text->selection) {
1075                                         screen->ToggleSelection();
1076                                         text->ClearSelection();
1077                                         text->FullRebreak();
1078                                         screen->Update();
1079                                         updateScrollbar();
1080                                 }
1081                                 // Popup table popup when on a table.
1082                                 // This is obviously temporary, since we
1083                                 // should be able to popup various
1084                                 // context-sensitive-menus with the
1085                                 // the right mouse. So this should be done more
1086                                 // general in the future. Matthias.
1087                                 selection_possible = false;
1088                                 owner_->getLyXFunc()
1089                                         ->Dispatch(LFUN_LAYOUT_TABLE,
1090                                                    "true");
1091                                 return 0;
1092                         }
1093                 }
1094
1095                 int screen_first = screen->first;
1096
1097                 // Middle button press pastes if we have a selection
1098                 bool paste_internally = false;
1099                 if (button == 2  // && !buffer_->the_locking_inset
1100                     && text->selection) {
1101                         owner_->getLyXFunc()->Dispatch(LFUN_COPY);
1102                         paste_internally = true;
1103                 }
1104
1105                 // Clear the selection
1106                 screen->ToggleSelection();
1107                 text->ClearSelection();
1108                 text->FullRebreak();
1109                 screen->Update();
1110                 updateScrollbar();
1111
1112                 // Single left click in math inset?
1113                 if (inset_hit != 0 && inset_hit->Editable() == 2) {
1114                         // Highly editable inset, like math
1115                         selection_possible = false;
1116                         owner_->updateLayoutChoice();
1117                         owner_->getMiniBuffer()->Set(inset_hit->EditMessage());
1118                         inset_hit->Edit(inset_x, inset_y);
1119                         return 0;
1120                 }
1121
1122                 // Right click on a footnote flag opens float menu
1123                 if (button == 3) {
1124                         selection_possible = false;
1125                         return 0;
1126                 }
1127
1128                 text->SetCursorFromCoordinates(x, y + screen_first);
1129                 text->FinishUndo();
1130                 text->sel_cursor = text->cursor;
1131                 text->cursor.x_fix = text->cursor.x;
1132
1133                 owner_->updateLayoutChoice();
1134                 if (screen->FitCursor()){
1135                         updateScrollbar();
1136                         selection_possible = false;
1137                 }
1138
1139                 // Insert primary selection with middle mouse
1140                 // if there is a local selection in the current buffer,
1141                 // insert this
1142                 if (button == 2) { //  && !buffer_->the_locking_inset){
1143                         if (paste_internally)
1144                                 owner_->getLyXFunc()->Dispatch(LFUN_PASTE);
1145                         else
1146                                 owner_->getLyXFunc()->Dispatch(LFUN_PASTESELECTION,
1147                                                                "paragraph");
1148                         selection_possible = false;
1149                         return 0;
1150                 }
1151         }
1152         goto out;
1153   wheel:
1154         {
1155                 // I am not quite sure if this is the correct place to put
1156                 // this, but it will not cause any harm.
1157                 // Patch from Mark Huang (markman@mit.edu) to make LyX
1158                 // recognise button 4 and 5. This enables LyX use use
1159                 // the scrollwhell on certain mice for something useful. (Lgb)
1160                 // Added wheel acceleration detection code. (Rvdk)
1161                 static Time lastTime = 0;
1162                 int diff = ev->xbutton.time - lastTime;
1163                 int scroll = int(1.0 + (4.0 / (abs(diff) + 1.0)) * 200.0);
1164                 switch (button) {
1165                 case 4:
1166                         ScrollUp(scroll);
1167                         break;
1168                 case 5:
1169                         ScrollDown(scroll);
1170                         break;
1171                 }
1172                 lastTime = ev->xbutton.time;
1173                 return 0;
1174         }
1175   out:
1176         last_click_x = x;
1177         last_click_y = y;
1178
1179         return 0;
1180 }
1181
1182
1183 int BufferView::WorkAreaButtonRelease(FL_OBJECT * ob, Window ,
1184                                       int /*w*/, int /*h*/,
1185                                       XEvent * ev, void * /*d*/)
1186 {
1187         if (buffer_ == 0 || screen == 0) return 0;
1188
1189         int const x = ev->xbutton.x - ob->x;
1190         int const y = ev->xbutton.y - ob->y;
1191
1192         // If we hit an inset, we have the inset coordinates in these
1193         // and inset_hit points to the inset.  If we do not hit an
1194         // inset, inset_hit is 0, and inset_x == x, inset_y == y.
1195         int inset_x = x;
1196         int inset_y = y;
1197         Inset * inset_hit = checkInsetHit(inset_x, inset_y);
1198
1199         if (the_locking_inset) {
1200                 // We are in inset locking mode.
1201
1202                 /* LyX does a kind of work-area grabbing for insets.
1203                    Only a ButtonPress Event outside the inset will
1204                    force a InsetUnlock. */
1205                 the_locking_inset->
1206                         InsetButtonRelease(inset_x, inset_y,
1207                                            ev->xbutton.button);
1208                 return 0;
1209         }
1210
1211         selection_possible = false;
1212         if (text->cursor.par->table) {
1213                 int cell = text->
1214                         NumberOfCell(text->cursor.par,
1215                                      text->cursor.pos);
1216                 if (text->cursor.par->table->IsContRow(cell) &&
1217                     text->cursor.par->table->
1218                     CellHasContRow(text->cursor.par->table->
1219                                    GetCellAbove(cell))<0) {
1220                         text->CursorUp();
1221                 }
1222         }
1223
1224         if (ev->xbutton.button >= 2)
1225                 return 0;
1226
1227         // Make sure that the press was not far from the release
1228         if ((abs(last_click_x - x) >= 5) ||
1229             (abs(last_click_y - y) >= 5)) {
1230                 return 0;
1231         }
1232
1233         // Did we hit an editable inset?
1234         if (inset_hit != 0) {
1235                 // Inset like error, notes and figures
1236                 selection_possible = false;
1237 #ifdef WITH_WARNINGS
1238 #warning fix this proper in 0.13
1239 #endif
1240                 // Following a ref shouldn't issue
1241                 // a push on the undo-stack
1242                 // anylonger, now that we have
1243                 // keybindings for following
1244                 // references and returning from
1245                 // references.  IMHO though, it
1246                 // should be the inset's own business
1247                 // to push or not push on the undo
1248                 // stack. They don't *have* to
1249                 // alter the document...
1250                 // (Joacim)
1251                 // ...or maybe the SetCursorParUndo()
1252                 // below isn't necessary at all anylonger?
1253                 if (inset_hit->LyxCode() == Inset::REF_CODE) {
1254                         text->SetCursorParUndo();
1255                 }
1256
1257                 owner_->getMiniBuffer()->Set(inset_hit->EditMessage());
1258                 inset_hit->Edit(inset_x, inset_y);
1259                 return 0;
1260         }
1261
1262         // check whether we want to open a float
1263         if (text) {
1264                 bool hit = false;
1265                 char c = ' ';
1266                 if (text->cursor.pos <
1267                     text->cursor.par->Last()) {
1268                         c = text->cursor.par->
1269                                 GetChar(text->cursor.pos);
1270                 }
1271                 if (c == LyXParagraph::META_FOOTNOTE
1272                     || c == LyXParagraph::META_MARGIN
1273                     || c == LyXParagraph::META_FIG
1274                     || c == LyXParagraph::META_TAB
1275                     || c == LyXParagraph::META_WIDE_FIG
1276                     || c == LyXParagraph::META_WIDE_TAB
1277                     || c == LyXParagraph::META_ALGORITHM){
1278                         hit = true;
1279                 } else if (text->cursor.pos - 1 >= 0) {
1280                         c = text->cursor.par->
1281                                 GetChar(text->cursor.pos - 1);
1282                         if (c == LyXParagraph::META_FOOTNOTE
1283                             || c == LyXParagraph::META_MARGIN
1284                             || c == LyXParagraph::META_FIG
1285                             || c == LyXParagraph::META_TAB
1286                             || c == LyXParagraph::META_WIDE_FIG
1287                             || c == LyXParagraph::META_WIDE_TAB
1288                             || c == LyXParagraph::META_ALGORITHM){
1289                                 // We are one step too far to the right
1290                                 text->CursorLeft();
1291                                 hit = true;
1292                         }
1293                 }
1294                 if (hit == true) {
1295                         toggleFloat();
1296                         selection_possible = false;
1297                         return 0;
1298                 }
1299         }
1300
1301         // Do we want to close a float? (click on the float-label)
1302         if (text->cursor.row->par->footnoteflag ==
1303             LyXParagraph::OPEN_FOOTNOTE
1304             && text->cursor.pos == 0
1305             && text->cursor.row->previous &&
1306             text->cursor.row->previous->par->
1307             footnoteflag != LyXParagraph::OPEN_FOOTNOTE){
1308                 LyXFont font (LyXFont::ALL_SANE);
1309                 font.setSize(LyXFont::SIZE_SMALL);
1310
1311                 int box_x = 20; // LYX_PAPER_MARGIN;
1312                 box_x += font.textWidth("Mwide-figM", 10);
1313
1314                 int screen_first = screen->first;
1315
1316                 if (x < box_x
1317                     && y + screen_first > text->cursor.y -
1318                     text->cursor.row->baseline
1319                     && y + screen_first < text->cursor.y -
1320                     text->cursor.row->baseline
1321                     + font.maxAscent() * 1.2 + font.maxDescent() * 1.2) {
1322                         toggleFloat();
1323                         selection_possible = false;
1324                         return 0;
1325                 }
1326         }
1327
1328         // Maybe we want to edit a bibitem ale970302
1329         if (text->cursor.par->bibkey && x < 20 +
1330             bibitemMaxWidth(textclasslist
1331                             .TextClass(buffer_->
1332                                        params.textclass).defaultfont())) {
1333                 text->cursor.par->bibkey->Edit(0, 0);
1334         }
1335
1336         return 0;
1337 }
1338
1339
1340 /*
1341  * Returns an inset if inset was hit. 0 otherwise.
1342  * If hit, the coordinates are changed relative to the inset.
1343  * Otherwise coordinates are not changed, and false is returned.
1344  */
1345 Inset * BufferView::checkInsetHit(int & x, int & y)
1346 {
1347         if (!getScreen())
1348                 return 0;
1349
1350         int y_tmp = y + getScreen()->first;
1351
1352         LyXCursor cursor = text->cursor;
1353         if (cursor.pos < cursor.par->Last()
1354             && cursor.par->GetChar(cursor.pos) == LyXParagraph::META_INSET
1355             && cursor.par->GetInset(cursor.pos)
1356             && cursor.par->GetInset(cursor.pos)->Editable()) {
1357
1358                 // Check whether the inset really was hit
1359                 Inset * tmpinset = cursor.par->GetInset(cursor.pos);
1360                 LyXFont font = text->GetFont(cursor.par, cursor.pos);
1361                 if (x > cursor.x
1362                     && x < cursor.x + tmpinset->Width(font)
1363                     && y_tmp > cursor.y - tmpinset->Ascent(font)
1364                     && y_tmp < cursor.y + tmpinset->Descent(font)) {
1365                         x = x - cursor.x;
1366                         // The origin of an inset is on the baseline
1367                         y = y_tmp - (cursor.y);
1368                         return tmpinset;
1369                 }
1370         } else if (cursor.pos - 1 >= 0
1371                    && cursor.par->GetChar(cursor.pos - 1) == LyXParagraph::META_INSET
1372                    && cursor.par->GetInset(cursor.pos - 1)
1373                    && cursor.par->GetInset(cursor.pos - 1)->Editable()) {
1374                 text->CursorLeft();
1375                 Inset * result = checkInsetHit(x, y);
1376                 if (result == 0) {
1377                         text->CursorRight();
1378                         return 0;
1379                 } else {
1380                         return result;
1381                 }
1382         }
1383         return 0;
1384 }
1385
1386
1387 int BufferView::workAreaExpose()
1388 {
1389         if (!work_area || !work_area->form->visible)
1390                 return 1;
1391
1392         // this is a hack to ensure that we only call this through
1393         // BufferView::redraw().
1394         if (!lgb_hack) {
1395                 redraw();
1396         }
1397
1398         static int work_area_width = work_area->w;
1399         static int work_area_height = work_area->h;
1400
1401         bool widthChange = work_area->w != work_area_width;
1402         bool heightChange = work_area->h != work_area_height;
1403
1404         // update from work area
1405         work_area_width = work_area->w;
1406         work_area_height = work_area->h;
1407         if (buffer_ != 0) {
1408                 if (widthChange) {
1409                         // All buffers need a resize
1410                         bufferlist.resize();
1411
1412                         // Remove all texts from the textcache
1413                         if (lyxerr.debugging())
1414                                 showTextCache("Expose delete all");
1415                         while(!textcache.empty()) {
1416                                 LyXText * tt = textcache.front();
1417                                 textcache.erase(textcache.begin());
1418                                 delete tt;
1419                         }
1420                 } else if (heightChange) {
1421                         // Rebuild image of current screen
1422                         updateScreen();
1423                         // fitCursor() ensures we don't jump back
1424                         // to the start of the document on vertical
1425                         // resize
1426                         fitCursor();
1427
1428                         // The main window size has changed, repaint most stuff
1429                         redraw();
1430                         // ...including the minibuffer
1431                         owner_->getMiniBuffer()->Init();
1432
1433                 } else if (screen) screen->Redraw();
1434         } else {
1435                 // Grey box when we don't have a buffer
1436                 fl_winset(FL_ObjWin(work_area));
1437                 fl_rectangle(1, work_area->x, work_area->y,
1438                              work_area->w, work_area->h, FL_GRAY63);
1439         }
1440
1441         // always make sure that the scrollbar is sane.
1442         updateScrollbar();
1443         owner_->updateLayoutChoice();
1444         return 1;
1445 }
1446
1447
1448 // Callback for cursor timer
1449 void BufferView::CursorToggleCB(FL_OBJECT * ob, long)
1450 {
1451         BufferView * view = static_cast<BufferView*>(ob->u_vdata);
1452
1453         // Quite a nice place for asyncron Inset updating, isn't it?
1454         // Actually no! This is run even if no buffer exist... so (Lgb)
1455         if (view && !view->buffer_) {
1456                 goto set_timer_and_return;
1457         }
1458
1459         // NOTE:
1460         // On my quest to solve the gs render hangups I am now
1461         // disabling the SIGHUP completely, and will do a wait
1462         // now and then instead. If the guess that xforms somehow
1463         // destroys something is true, this is likely (hopefully)
1464         // to solve the problem...at least I hope so. Lgb
1465
1466         // ...Ok this seems to work...at least it does not make things
1467         // worse so far. However I still see gs processes that hangs.
1468         // I would really like to know _why_ they are hanging. Anyway
1469         // the solution without the SIGCHLD handler seems to be easier
1470         // to debug.
1471
1472         // When attaching gdb to a a running gs that hangs it shows
1473         // that it is waiting for input(?) Is it possible for us to
1474         // provide that input somehow? Or figure what it is expecing
1475         // to read?
1476
1477         // One solution is to, after some time, look if there are some
1478         // old gs processes still running and if there are: kill them
1479         // and re render.
1480
1481         // Another solution is to provide the user an option to rerender
1482         // a picture. This would, for the picture in question, check if
1483         // there is a gs running for it, if so kill it, and start a new
1484         // rendering process.
1485
1486         // these comments posted to lyx@via
1487         {
1488                 int status = 1;
1489                 int pid = waitpid(static_cast<pid_t>(0), &status, WNOHANG);
1490                 if (pid == -1) // error find out what is wrong
1491                         ; // ignore it for now.
1492                 else if (pid > 0)
1493                         sigchldhandler(pid, &status);
1494         }
1495         if (InsetUpdateList)
1496                 UpdateInsetUpdateList();
1497
1498         if (view && !view->screen){
1499                 goto set_timer_and_return;
1500         }
1501
1502         if (view->lyx_focus && view->work_area_focus) {
1503                 if (!view->the_locking_inset) {
1504                         view->screen->CursorToggle();
1505                 } else {
1506                         view->the_locking_inset->
1507                                 ToggleInsetCursor();
1508                 }
1509                 goto set_timer_and_return;
1510         } else {
1511                 // Make sure that the cursor is visible.
1512                 if (!view->the_locking_inset) {
1513                         view->screen->ShowCursor();
1514                 } else {
1515                         if (!view->the_locking_inset->isCursorVisible())
1516                                 view->the_locking_inset->
1517                                         ToggleInsetCursor();
1518                 }
1519                 // This is only run when work_area_focus or lyx_focus is false.
1520                 Window tmpwin;
1521                 int tmp;
1522                 XGetInputFocus(fl_display, &tmpwin, &tmp);
1523                 // Commenting this out, we have not had problems with this
1524                 // for a long time. We will probably work on this code later
1525                 // and we can reenable this debug code then. Now it only
1526                 // anoying when debugging. (Lgb)
1527                 //if (lyxerr.debugging(Debug::INFO)) {
1528                 //      lyxerr << "tmpwin: " << tmpwin
1529                 //             << "\nwindow: " << view->owner_->getForm()->window
1530                 //             << "\nwork_area_focus: " << view->work_area_focus
1531                 //             << "\nlyx_focus      : " << view->lyx_focus
1532                 //             << endl;
1533                 //}
1534                 if (tmpwin != view->owner_->getForm()->window) {
1535                         view->lyx_focus = false;
1536                         goto skip_timer;
1537                 } else {
1538                         view->lyx_focus = true;
1539                         if (!view->work_area_focus)
1540                                 goto skip_timer;
1541                         else
1542                                 goto set_timer_and_return;
1543                 }
1544         }
1545
1546   set_timer_and_return:
1547         fl_set_timer(ob, 0.4);
1548   skip_timer:
1549         return;
1550 }
1551
1552
1553 int BufferView::WorkAreaSelectionNotify(FL_OBJECT *, Window win,
1554                                         int /*w*/, int /*h*/,
1555                                         XEvent * event, void */*d*/)
1556 {
1557         if (buffer_ == 0) return 0;
1558         if (event->type != SelectionNotify)
1559                 return 0;
1560
1561         Atom tmpatom;
1562         unsigned long ul1;
1563         unsigned long ul2;
1564         unsigned char * uc = 0;
1565         int tmpint;
1566         screen->HideCursor();
1567         beforeChange();
1568         if (event->xselection.type == XA_STRING
1569             && event->xselection.property) {
1570
1571                 if (XGetWindowProperty(
1572                         fl_display            /* display */,
1573                         win /* w */,
1574                         event->xselection.property        /* property */,
1575                         0                /* long_offset */,
1576                         0                /* long_length */,
1577                         false                /* delete */,
1578                         XA_STRING                /* req_type */,
1579                         &tmpatom               /* actual_type_return */,
1580                         &tmpint                /* actual_format_return */,
1581                         &ul1      /* nitems_return */,
1582                         &ul2      /* bytes_after_return */,
1583                         &uc     /* prop_return */
1584                         ) != Success) {
1585                         return 0;
1586                 }
1587                 XFlush(fl_display);
1588
1589                 if (uc) {
1590                         free(uc);
1591                         uc = 0;
1592                 }
1593
1594                 if (XGetWindowProperty(
1595                         fl_display           /* display */,
1596                         win              /* w */,
1597                         event->xselection.property           /* property */,
1598                         0                /* long_offset */,
1599                         ul2/4+1                /* long_length */,
1600                         True                /* delete */,
1601                         XA_STRING                /* req_type */,
1602                         &tmpatom               /* actual_type_return */,
1603                         &tmpint                /* actual_format_return */,
1604                         &ul1      /* nitems_return */,
1605                         &ul2      /* bytes_after_return */,
1606                         &uc     /* prop_return */
1607                         ) != Success) {
1608                         return 0;
1609                 }
1610                 XFlush(fl_display);
1611
1612                 if (uc) {
1613                         if (!ascii_type) {
1614                                 text->InsertStringA(reinterpret_cast<char*>(uc));
1615                         } else {
1616                                 text->InsertStringB(reinterpret_cast<char*>(uc));
1617                         }
1618                         free(uc);
1619                         uc = 0;
1620                 }
1621
1622                 update(1);
1623         }
1624         return 0;
1625 }
1626
1627
1628 void BufferView::cursorPrevious()
1629 {
1630         if (!text->cursor.row->previous) return;
1631
1632         long y = getScreen()->first;
1633         Row * cursorrow = text->cursor.row;
1634         text->SetCursorFromCoordinates(text->cursor.x_fix, y);
1635         text->FinishUndo();
1636         // This is to allow jumping over large insets
1637         if ((cursorrow == text->cursor.row))
1638                 text->CursorUp();
1639
1640         if (text->cursor.row->height < work_area->h)
1641                 getScreen()->Draw(text->cursor.y
1642                                   - text->cursor.row->baseline
1643                                   + text->cursor.row->height
1644                                   - work_area->h +1 );
1645 }
1646
1647
1648 void BufferView::cursorNext()
1649 {
1650         if (!text->cursor.row->next) return;
1651
1652         long y = getScreen()->first;
1653         text->GetRowNearY(y);
1654         Row * cursorrow = text->cursor.row;
1655         text->SetCursorFromCoordinates(text->cursor.x_fix, y + work_area->h);
1656         text->FinishUndo();
1657         // This is to allow jumping over large insets
1658         if ((cursorrow == text->cursor.row))
1659                 text->CursorDown();
1660
1661         if (text->cursor.row->height < work_area->h)
1662                 getScreen()->Draw(text->cursor.y
1663                                   - text->cursor.row->baseline);
1664 }
1665
1666
1667 bool BufferView::available() const
1668 {
1669         if (buffer_ && text) return true;
1670         return false;
1671 }
1672
1673
1674 void BufferView::beforeChange()
1675 {
1676         getScreen()->ToggleSelection();
1677         text->ClearSelection();
1678         FreeUpdateTimer();
1679 }
1680
1681
1682 void BufferView::savePosition()
1683 {
1684         backstack.push(buffer()->fileName(),
1685                        text->cursor.x,
1686                        text->cursor.y);
1687 }
1688
1689
1690 void BufferView::restorePosition()
1691 {
1692         if (backstack.empty()) return;
1693
1694         int  x, y;
1695         string fname = backstack.pop(&x, &y);
1696
1697         beforeChange();
1698         Buffer * b = bufferlist.exists(fname) ?
1699                 bufferlist.getBuffer(fname) :
1700                 bufferlist.loadLyXFile(fname); // don't ask, just load it
1701         buffer(b);
1702         text->SetCursorFromCoordinates(x, y);
1703         update(0);
1704 }
1705
1706
1707 void BufferView::update(signed char f)
1708 {
1709         owner()->updateLayoutChoice();
1710
1711         if (!text->selection && f > -3)
1712                 text->sel_cursor = text->cursor;
1713
1714         FreeUpdateTimer();
1715         text->FullRebreak();
1716
1717         update();
1718
1719         if (f != 3 && f != -3) {
1720                 fitCursor();
1721                 updateScrollbar();
1722         }
1723
1724         if (f == 1 || f == -1) {
1725                 if (buffer()->isLyxClean()) {
1726                         buffer()->markDirty();
1727                         owner()->getMiniBuffer()->setTimer(4);
1728                 } else {
1729                         buffer()->markDirty();
1730                 }
1731         }
1732 }
1733
1734
1735 void BufferView::smallUpdate(signed char f)
1736 {
1737         getScreen()->SmallUpdate();
1738         if (getScreen()->TopCursorVisible()
1739             != getScreen()->first) {
1740                 update(f);
1741                 return;
1742         }
1743
1744         fitCursor();
1745         updateScrollbar();
1746
1747         if (!text->selection)
1748                 text->sel_cursor = text->cursor;
1749
1750         if (f == 1 || f == -1) {
1751                 if (buffer()->isLyxClean()) {
1752                         buffer()->markDirty();
1753                         owner()->getMiniBuffer()->setTimer(4);
1754                 } else {
1755                         buffer()->markDirty();
1756                 }
1757         }
1758 }
1759
1760
1761 void BufferView::insetSleep()
1762 {
1763         if (the_locking_inset && !inset_slept) {
1764                 the_locking_inset->GetCursorPos(slx, sly);
1765                 the_locking_inset->InsetUnlock();
1766                 inset_slept = true;
1767         }
1768 }
1769
1770
1771 void BufferView::insetWakeup()
1772 {
1773         if (the_locking_inset && inset_slept) {
1774                 the_locking_inset->Edit(slx, sly);
1775                 inset_slept = false;
1776         }
1777 }
1778
1779
1780 void BufferView::insetUnlock()
1781 {
1782         if (the_locking_inset) {
1783                 if (!inset_slept) the_locking_inset->InsetUnlock();
1784                 the_locking_inset = 0;
1785                 text->FinishUndo();
1786                 inset_slept = false;
1787         }
1788 }