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 1995-2000 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 "insets/insetbib.h"
  36 #include "minibuffer.h"
  37 #include "lyxscreen.h"
  38
  39 #include "debug.h"
  40 #include "lyx_gui_misc.h"
  41 #include "BackStack.h"
  42 #include "lyxtext.h"
  43 #include "lyx_cb.h"
  44 #include "gettext.h"
  45 #include "layout.h"
  46 #include "TextCache.h"
  47 #include "intl.h"
  48 #include "lyxrc.h"
  49 #include "lyxrow.h"
  50 #include "WorkArea.h"
  51
  52 using std::find_if;
  53
  54 extern BufferList bufferlist;
  55
  56 void sigchldhandler(pid_t pid, int * status);
  57
  58 extern void SetXtermCursor(Window win);
  59 extern bool input_prohibited;
  60 extern bool selection_possible;
  61 extern char ascii_type;
  62 extern void MenuPasteSelection(char at);
  63 extern void FreeUpdateTimer();
  64
  65 BufferView::BufferView(LyXView * o, int xpos, int ypos,
  66                        int width, int height)
  67         : owner_(o)
  68 {
  69         buffer_ = 0;
  70         text = 0;
  71         workarea = new WorkArea(this, xpos, ypos, width, height);
  72         screen = 0;
  73         timer_cursor = 0;
  74         create_view();
  75         current_scrollbar_value = 0;
  76         // Activate the timer for the cursor
  77         fl_set_timer(timer_cursor, 0.4);
  78         workarea->setFocus();
  79         work_area_focus = true;
  80         lyx_focus = false;
  81         the_locking_inset = 0;
  82         inset_slept = false;
  83 }
  84
  85
  86 BufferView::~BufferView()
  87 {
  88         delete text;
  89 }
  90
  91
  92 Painter & BufferView::painter()
  93 {
  94         return workarea->getPainter();
  95 }
  96
  97
  98 void BufferView::buffer(Buffer * b)
  99 {
 100         lyxerr[Debug::INFO] << "Setting buffer in BufferView ("
 101                             << b << ")" << endl;
 102         if (buffer_) {
 103                 insetSleep();
 104                 buffer_->delUser(this);
 105
 106                 // Put the old text into the TextCache, but
 107                 // only if the buffer is still loaded.
 108                 // Also set the owner of the test to 0
 109                 text->owner(0);
 110                 textcache.add(text);
 111                 if (lyxerr.debugging())
 112                         textcache.show(lyxerr, "BufferView::buffer");
 113
 114                 text = 0;
 115         }
 116
 117         // Set current buffer
 118         buffer_ = b;
 119
 120         if (bufferlist.getState() == BufferList::CLOSING) return;
 121
 122         // Nuke old image
 123         // screen is always deleted when the buffer is changed.
 124         delete screen;
 125         screen = 0;
 126
 127         // If we are closing the buffer, use the first buffer as current
 128         if (!buffer_) {
 129                 buffer_ = bufferlist.first();
 130         }
 131
 132         if (buffer_) {
 133                 lyxerr[Debug::INFO] << "Buffer addr: " << buffer_ << endl;
 134                 buffer_->addUser(this);
 135                 owner_->getMenus()->showMenus();
 136                 // If we don't have a text object for this, we make one
 137                 if (text == 0)
 138                         resizeCurrentBuffer();
 139                 else {
 140                         updateScreen();
 141                         updateScrollbar();
 142                 }
 143                 screen->first = screen->TopCursorVisible();
 144                 redraw();
 145                 updateAllVisibleBufferRelatedPopups();
 146                 insetWakeup();
 147         } else {
 148                 lyxerr[Debug::INFO] << "  No Buffer!" << endl;
 149                 owner_->getMenus()->hideMenus();
 150                 updateScrollbar();
 151                 workarea->redraw();
 152
 153                 // Also remove all remaining text's from the testcache.
 154                 // (there should not be any!) (if there is any it is a
 155                 // bug!)
 156                 if (lyxerr.debugging())
 157                         textcache.show(lyxerr, "buffer delete all");
 158                 textcache.clear();
 159         }
 160         // should update layoutchoice even if we don't have a buffer.
 161         owner_->updateLayoutChoice();
 162         owner_->getMiniBuffer()->Init();
 163         owner_->updateWindowTitle();
 164 }
 165
 166
 167 void BufferView::updateScreen()
 168 {
 169         // Regenerate the screen.
 170         delete screen;
 171         screen = new LyXScreen(*workarea, text);
 172 }
 173
 174
 175 void BufferView::resize(int xpos, int ypos, int width, int height)
 176 {
 177         workarea->resize(xpos, ypos, width, height);
 178         update(3);
 179         redraw();
 180 }
 181
 182
 183 void BufferView::resize()
 184 {
 185         // This will resize the buffer. (Asger)
 186         if (buffer_)
 187                 resizeCurrentBuffer();
 188 }
 189
 190
 191 void BufferView::redraw()
 192 {
 193         lyxerr[Debug::INFO] << "BufferView::redraw()" << endl;
 194         workarea->redraw();
 195 }
 196
 197
 198 void BufferView::fitCursor()
 199 {
 200         if (screen) screen->FitCursor();
 201         updateScrollbar();
 202 }
 203
 204
 205 void BufferView::update()
 206 {
 207         if (screen) screen->Update();
 208 }
 209
 210
 211 void BufferView::updateScrollbar()
 212 {
 213         /* If the text is smaller than the working area, the scrollbar
 214          * maximum must be the working area height. No scrolling will
 215          * be possible */
 216
 217         if (!buffer_) {
 218                 workarea->setScrollbar(0, 1.0);
 219                 return;
 220         }
 221
 222         static long max2 = 0;
 223         static long height2 = 0;
 224
 225         long cbth = 0;
 226         long cbsf = 0;
 227
 228         if (text)
 229                 cbth = text->height;
 230         if (screen)
 231                 cbsf = screen->first;
 232
 233         // check if anything has changed.
 234         if (max2 == cbth &&
 235             height2 == workarea->height() &&
 236             current_scrollbar_value == cbsf)
 237                 return; // no
 238         max2 = cbth;
 239         height2 = workarea->height();
 240         current_scrollbar_value = cbsf;
 241
 242         if (cbth <= height2) { // text is smaller than screen
 243                 workarea->setScrollbar(0, 1.0); // right?
 244                 return;
 245         }
 246
 247         long maximum_height = workarea->height() * 3 / 4 + cbth;
 248         long value = cbsf;
 249
 250         // set the scrollbar
 251         double hfloat = workarea->height();
 252         double maxfloat = maximum_height;
 253
 254         float slider_size = 0.0;
 255         int slider_value = value;
 256
 257         workarea->setScrollbarBounds(0, text->height - workarea->height());
 258         double lineh = text->DefaultHeight();
 259         workarea->setScrollbarIncrements(lineh);
 260         if (maxfloat > 0.0) {
 261                 if ((hfloat / maxfloat) * float(height2) < 3)
 262                         slider_size = 3.0/float(height2);
 263                 else
 264                         slider_size = hfloat / maxfloat;
 265         } else
 266                 slider_size = hfloat;
 267
 268         workarea->setScrollbar(slider_value, slider_size / workarea->height());
 269 }
 270
 271
 272 void BufferView::redoCurrentBuffer()
 273 {
 274         lyxerr[Debug::INFO] << "BufferView::redoCurrentBuffer" << endl;
 275         if (buffer_ && text) {
 276                 resize();
 277                 owner_->updateLayoutChoice();
 278         }
 279 }
 280
 281
 282 int BufferView::resizeCurrentBuffer()
 283 {
 284         lyxerr[Debug::INFO] << "resizeCurrentBuffer" << endl;
 285
 286         LyXParagraph * par = 0;
 287         LyXParagraph * selstartpar = 0;
 288         LyXParagraph * selendpar = 0;
 289         int pos = 0;
 290         int selstartpos = 0;
 291         int selendpos = 0;
 292         int selection = 0;
 293         int mark_set = 0;
 294
 295         ProhibitInput();
 296
 297         owner_->getMiniBuffer()->Set(_("Formatting document..."));
 298
 299         if (text) {
 300                 par = text->cursor.par;
 301                 pos = text->cursor.pos;
 302                 selstartpar = text->sel_start_cursor.par;
 303                 selstartpos = text->sel_start_cursor.pos;
 304                 selendpar = text->sel_end_cursor.par;
 305                 selendpos = text->sel_end_cursor.pos;
 306                 selection = text->selection;
 307                 mark_set = text->mark_set;
 308                 delete text;
 309                 text = new LyXText(this, workarea->workWidth(), buffer_);
 310         } else {
 311                 // See if we have a text in TextCache that fits
 312                 // the new buffer_ with the correct width.
 313                 text = textcache.findFit(buffer_, workarea->workWidth());
 314                 if (text) {
 315                         if (lyxerr.debugging()) {
 316                                 lyxerr << "Found a LyXText that fits:\n";
 317                                 textcache.show(lyxerr, text);
 318                         }
 319                         // Set the owner of the newly found text
 320                         text->owner(this);
 321                         if (lyxerr.debugging())
 322                                 textcache.show(lyxerr, "resizeCurrentBuffer");
 323                 } else {
 324                         text = new LyXText(this, workarea->workWidth(), buffer_);
 325                 }
 326         }
 327         updateScreen();
 328
 329         if (par) {
 330                 text->selection = true;
 331                 /* at this point just to avoid the Delete-Empty-Paragraph
 332                  * Mechanism when setting the cursor */
 333                 text->mark_set = mark_set;
 334                 if (selection) {
 335                         text->SetCursor(selstartpar, selstartpos);
 336                         text->sel_cursor = text->cursor;
 337                         text->SetCursor(selendpar, selendpos);
 338                         text->SetSelection();
 339                         text->SetCursor(par, pos);
 340                 } else {
 341                         text->SetCursor(par, pos);
 342                         text->sel_cursor = text->cursor;
 343                         text->selection = false;
 344                 }
 345         }
 346         screen->first = screen->TopCursorVisible(); /* this will scroll the
 347                                                      * screen such that the
 348                                                      * cursor becomes
 349                                                      * visible */
 350         updateScrollbar();
 351         redraw();
 352         owner_->getMiniBuffer()->Init();
 353         setState();
 354         AllowInput();
 355
 356         // Now if the title form still exist kill it
 357         TimerCB(0, 0);
 358
 359         return 0;
 360 }
 361
 362
 363 void BufferView::gotoError()
 364 {
 365         if (!screen)
 366                 return;
 367
 368         screen->HideCursor();
 369         beforeChange();
 370         update(-2);
 371         LyXCursor tmp;
 372
 373         if (!text->GotoNextError()) {
 374                 if (text->cursor.pos
 375                     || text->cursor.par != text->FirstParagraph()) {
 376                         tmp = text->cursor;
 377                         text->cursor.par = text->FirstParagraph();
 378                         text->cursor.pos = 0;
 379                         if (!text->GotoNextError()) {
 380                                 text->cursor = tmp;
 381                                 owner_->getMiniBuffer()
 382                                         ->Set(_("No more errors"));
 383                                 LyXBell();
 384                         }
 385                 } else {
 386                         owner_->getMiniBuffer()->Set(_("No more errors"));
 387                         LyXBell();
 388                 }
 389         }
 390         update(0);
 391         text->sel_cursor = text->cursor;
 392 }
 393
 394
 395 extern "C" {
 396         void C_BufferView_CursorToggleCB(FL_OBJECT * ob, long buf)
 397         {
 398                 BufferView::cursorToggleCB(ob, buf);
 399         }
 400 }
 401
 402
 403 void BufferView::create_view()
 404 {
 405         FL_OBJECT * obj;
 406
 407         //
 408         // TIMERS
 409         //
 410
 411         // timer_cursor
 412         timer_cursor = obj = fl_add_timer(FL_HIDDEN_TIMER,
 413                                           0, 0, 0, 0, "Timer");
 414         fl_set_object_callback(obj, C_BufferView_CursorToggleCB, 0);
 415         obj->u_vdata = this;
 416 }
 417
 418
 419 // Callback for scrollbar up button
 420 void BufferView::upCB(long time, int button)
 421 {
 422         if (buffer_ == 0) return;
 423
 424         switch (button) {
 425         case 3:
 426                 scrollUpOnePage();
 427                 break;
 428         case 2:
 429                 scrollDownOnePage();
 430                 break;
 431         default:
 432                 scrollUp(time);
 433                 break;
 434         }
 435 }
 436
 437
 438 static inline
 439 void waitForX()
 440 {
 441         XSync(fl_get_display(), 0);
 442 }
 443
 444
 445 // Callback for scrollbar slider
 446 void BufferView::scrollCB(double value)
 447 {
 448         extern bool cursor_follows_scrollbar;
 449
 450         if (buffer_ == 0) return;
 451
 452         current_scrollbar_value = long(value);
 453         if (current_scrollbar_value < 0)
 454                 current_scrollbar_value = 0;
 455
 456         if (!screen)
 457                 return;
 458
 459         screen->Draw(current_scrollbar_value);
 460
 461         if (cursor_follows_scrollbar) {
 462                 LyXText * vbt = text;
 463                 int height = vbt->DefaultHeight();
 464
 465                 if (vbt->cursor.y < screen->first + height) {
 466                         vbt->SetCursorFromCoordinates(0,
 467                                                       screen->first +
 468                                                       height);
 469                 } else if (vbt->cursor.y >
 470                            screen->first + workarea->height() - height) {
 471                         vbt->SetCursorFromCoordinates(0,
 472                                                       screen->first +
 473                                                       workarea->height()  -
 474                                                       height);
 475                 }
 476         }
 477         waitForX();
 478 }
 479
 480
 481 // Callback for scrollbar down button
 482 void BufferView::downCB(long time, int button)
 483 {
 484         if (buffer_ == 0) return;
 485
 486         switch (button) {
 487         case 2:
 488                 scrollUpOnePage();
 489                 break;
 490         case 3:
 491                 scrollDownOnePage();
 492                 break;
 493         default:
 494                 scrollDown(time);
 495                 break;
 496         }
 497 }
 498
 499
 500 int BufferView::scrollUp(long time)
 501 {
 502         if (buffer_ == 0) return 0;
 503         if (!screen) return 0;
 504
 505         double value = workarea->getScrollbarValue();
 506
 507         if (value == 0) return 0;
 508
 509         float add_value =  (text->DefaultHeight()
 510                             + float(time) * float(time) * 0.125);
 511
 512         if (add_value > workarea->height())
 513                 add_value = float(workarea->height() -
 514                                   text->DefaultHeight());
 515
 516         value -= add_value;
 517
 518         if (value < 0)
 519                 value = 0;
 520
 521         workarea->setScrollbarValue(value);
 522
 523         scrollCB(value);
 524         return 0;
 525 }
 526
 527
 528 int BufferView::scrollDown(long time)
 529 {
 530         if (buffer_ == 0) return 0;
 531         if (!screen) return 0;
 532
 533         double value= workarea->getScrollbarValue();
 534         pair<double, double> p = workarea->getScrollbarBounds();
 535         double max = p.second;
 536
 537         if (value == max) return 0;
 538
 539         float add_value =  (text->DefaultHeight()
 540                             + float(time) * float(time) * 0.125);
 541
 542         if (add_value > workarea->height())
 543                 add_value = float(workarea->height() -
 544                                   text->DefaultHeight());
 545
 546         value += add_value;
 547
 548         if (value > max)
 549                 value = max;
 550
 551         workarea->setScrollbarValue(value);
 552
 553         scrollCB(value);
 554         return 0;
 555 }
 556
 557
 558 void BufferView::scrollUpOnePage()
 559 {
 560         if (buffer_ == 0) return;
 561         if (!screen) return;
 562
 563         long y = screen->first;
 564
 565         if (!y) return;
 566
 567         Row * row = text->GetRowNearY(y);
 568
 569         y = y - workarea->height() + row->height;
 570
 571         workarea->setScrollbarValue(y);
 572
 573         scrollCB(y);
 574 }
 575
 576
 577 void BufferView::scrollDownOnePage()
 578 {
 579         if (buffer_ == 0) return;
 580         if (!screen) return;
 581
 582         long y = screen->first;
 583
 584         if (y > text->height - workarea->height())
 585                 return;
 586
 587         y += workarea->height();
 588         text->GetRowNearY(y);
 589
 590         workarea->setScrollbarValue(y);
 591
 592         scrollCB(y);
 593 }
 594
 595
 596 void BufferView::workAreaMotionNotify(int x, int y, unsigned int state)
 597 {
 598         if (buffer_ == 0 || !screen) return;
 599
 600         // Check for inset locking
 601         if (the_locking_inset) {
 602                 LyXCursor cursor = text->cursor;
 603                 the_locking_inset->
 604                         InsetMotionNotify(this,
 605                                           x - cursor.x,
 606                                           y - cursor.y,
 607                                           state);
 608                 return;
 609         }
 610
 611         // Only use motion with button 1
 612         if (!state & Button1MotionMask)
 613                 return;
 614
 615         /* The selection possible is needed, that only motion events are
 616          * used, where the bottom press event was on the drawing area too */
 617         if (selection_possible) {
 618                 screen->HideCursor();
 619
 620                 text->SetCursorFromCoordinates(x, y + screen->first);
 621
 622                 if (!text->selection)
 623                         update(-3); // Maybe an empty line was deleted
 624
 625                 text->SetSelection();
 626                 screen->ToggleToggle();
 627                 if (screen->FitCursor())
 628                         updateScrollbar();
 629                 screen->ShowCursor();
 630         }
 631         return;
 632 }
 633
 634
 635 extern int bibitemMaxWidth(Painter &, LyXFont const &);
 636
 637
 638 // Single-click on work area
 639 void BufferView::workAreaButtonPress(int xpos, int ypos, unsigned int button)
 640 {
 641         last_click_x = -1;
 642         last_click_y = -1;
 643
 644         if (buffer_ == 0 || !screen) return;
 645
 646         Inset * inset_hit = checkInsetHit(xpos, ypos);
 647
 648         // ok ok, this is a hack.
 649         if (button == 4 || button == 5) {
 650                 switch (button) {
 651                 case 4:
 652                         scrollUp(100); // This number is only temporary
 653                         break;
 654                 case 5:
 655                         scrollDown(100);
 656                         break;
 657                 }
 658         }
 659
 660         if (the_locking_inset) {
 661                 // We are in inset locking mode
 662
 663                 /* Check whether the inset was hit. If not reset mode,
 664                    otherwise give the event to the inset */
 665                 if (inset_hit == the_locking_inset) {
 666                         the_locking_inset->
 667                                 InsetButtonPress(this,
 668                                                  xpos, ypos,
 669                                                  button);
 670                         return;
 671                 } else {
 672                         unlockInset(the_locking_inset);
 673                 }
 674         }
 675
 676         if (!inset_hit)
 677                 selection_possible = true;
 678         screen->HideCursor();
 679
 680         // Right button mouse click on a table
 681         if (button == 3 &&
 682             (text->cursor.par->table ||
 683              text->MouseHitInTable(xpos, ypos + screen->first))) {
 684                 // Set the cursor to the press-position
 685                 text->SetCursorFromCoordinates(xpos, ypos + screen->first);
 686                 bool doit = true;
 687
 688                 // Only show the table popup if the hit is in
 689                 // the table, too
 690                 if (!text->HitInTable(text->cursor.row, xpos))
 691                         doit = false;
 692
 693                 // Hit above or below the table?
 694                 if (doit) {
 695                         if (!text->selection) {
 696                                 screen->ToggleSelection();
 697                                 text->ClearSelection();
 698                                 text->FullRebreak();
 699                                 screen->Update();
 700                                 updateScrollbar();
 701                         }
 702                         // Popup table popup when on a table.
 703                         // This is obviously temporary, since we
 704                         // should be able to popup various
 705                         // context-sensitive-menus with the
 706                         // the right mouse. So this should be done more
 707                         // general in the future. Matthias.
 708                         selection_possible = false;
 709                         owner_->getLyXFunc()
 710                                 ->Dispatch(LFUN_LAYOUT_TABLE,
 711                                            "true");
 712                         return;
 713                 }
 714         }
 715
 716         int screen_first = screen->first;
 717
 718         // Middle button press pastes if we have a selection
 719         bool paste_internally = false;
 720         if (button == 2
 721             && text->selection) {
 722                 owner_->getLyXFunc()->Dispatch(LFUN_COPY);
 723                 paste_internally = true;
 724         }
 725
 726         // Clear the selection
 727         screen->ToggleSelection();
 728         text->ClearSelection();
 729         text->FullRebreak();
 730         screen->Update();
 731         updateScrollbar();
 732
 733         // Single left click in math inset?
 734         if ((inset_hit != 0) &&
 735             (inset_hit->Editable()==Inset::HIGHLY_EDITABLE)) {
 736                 // Highly editable inset, like math
 737                 UpdatableInset *inset = (UpdatableInset *)inset_hit;
 738                 selection_possible = false;
 739                 owner_->updateLayoutChoice();
 740                 owner_->getMiniBuffer()->Set(inset->EditMessage());
 741                 inset->InsetButtonPress(this, xpos, ypos, button);
 742                 inset->Edit(this, xpos, ypos, button);
 743                 return;
 744         }
 745
 746         // Right click on a footnote flag opens float menu
 747         if (button == 3) {
 748                 selection_possible = false;
 749                 return;
 750         }
 751
 752         text->SetCursorFromCoordinates(xpos, ypos + screen_first);
 753         text->FinishUndo();
 754         text->sel_cursor = text->cursor;
 755         text->cursor.x_fix = text->cursor.x;
 756
 757         owner_->updateLayoutChoice();
 758         if (screen->FitCursor()){
 759                 updateScrollbar();
 760                 selection_possible = false;
 761         }
 762
 763         // Insert primary selection with middle mouse
 764         // if there is a local selection in the current buffer,
 765         // insert this
 766         if (button == 2) {
 767                 if (paste_internally)
 768                         owner_->getLyXFunc()->Dispatch(LFUN_PASTE);
 769                 else
 770                         owner_->getLyXFunc()->Dispatch(LFUN_PASTESELECTION,
 771                                                        "paragraph");
 772                 selection_possible = false;
 773                 return;
 774         }
 775 }
 776
 777
 778 void BufferView::doubleClick(int /*x*/, int /*y*/, unsigned int button)
 779 {
 780         // select a word
 781         if (buffer_ && !the_locking_inset) {
 782                 if (screen && button == 1) {
 783                         screen->HideCursor();
 784                         screen->ToggleSelection();
 785                         text->SelectWord();
 786                         screen->ToggleSelection(false);
 787                         /* This will fit the cursor on the screen
 788                          * if necessary */
 789                         update(0);
 790                 }
 791         }
 792 }
 793
 794
 795 void BufferView::tripleClick(int /*x*/, int /*y*/, unsigned int button)
 796 {
 797         // select a line
 798         if (buffer_ && screen && button == 1) {
 799                 screen->HideCursor();
 800                 screen->ToggleSelection();
 801                 text->CursorHome();
 802                 text->sel_cursor = text->cursor;
 803                 text->CursorEnd();
 804                 text->SetSelection();
 805                 screen->ToggleSelection(false);
 806                 /* This will fit the cursor on the screen
 807                  * if necessary */
 808                 update(0);
 809         }
 810 }
 811
 812
 813 void BufferView::workAreaButtonRelease(int x, int y, unsigned int button)
 814 {
 815         if (buffer_ == 0 || screen == 0) return;
 816
 817         // If we hit an inset, we have the inset coordinates in these
 818         // and inset_hit points to the inset.  If we do not hit an
 819         // inset, inset_hit is 0, and inset_x == x, inset_y == y.
 820         Inset * inset_hit = checkInsetHit(x, y);
 821
 822         if (the_locking_inset) {
 823                 // We are in inset locking mode.
 824
 825                 /* LyX does a kind of work-area grabbing for insets.
 826                    Only a ButtonPress Event outside the inset will
 827                    force a InsetUnlock. */
 828                 the_locking_inset->
 829                         InsetButtonRelease(this, x, y, button);
 830                 return;
 831         }
 832
 833         selection_possible = false;
 834         if (text->cursor.par->table) {
 835                 int cell = text->
 836                         NumberOfCell(text->cursor.par,
 837                                      text->cursor.pos);
 838                 if (text->cursor.par->table->IsContRow(cell) &&
 839                     text->cursor.par->table->
 840                     CellHasContRow(text->cursor.par->table->
 841                                    GetCellAbove(cell))<0) {
 842                         text->CursorUp();
 843                 }
 844         }
 845
 846         if (button >= 2) return;
 847
 848         setState();
 849         owner_->getMiniBuffer()->Set(CurrentState());
 850
 851         // Did we hit an editable inset?
 852         if (inset_hit != 0) {
 853                 // Inset like error, notes and figures
 854                 selection_possible = false;
 855 #ifdef WITH_WARNINGS
 856 #warning fix this proper in 0.13
 857 #endif
 858                 // Following a ref shouldn't issue
 859                 // a push on the undo-stack
 860                 // anylonger, now that we have
 861                 // keybindings for following
 862                 // references and returning from
 863                 // references.  IMHO though, it
 864                 // should be the inset's own business
 865                 // to push or not push on the undo
 866                 // stack. They don't *have* to
 867                 // alter the document...
 868                 // (Joacim)
 869                 // ...or maybe the SetCursorParUndo()
 870                 // below isn't necessary at all anylonger?
 871                 if (inset_hit->LyxCode() == Inset::REF_CODE) {
 872                         text->SetCursorParUndo();
 873                 }
 874
 875                 owner_->getMiniBuffer()->Set(inset_hit->EditMessage());
 876                 if (inset_hit->Editable()==Inset::HIGHLY_EDITABLE) {
 877                         // Highly editable inset, like math
 878                         UpdatableInset *inset = (UpdatableInset *)inset_hit;
 879                         inset->InsetButtonRelease(this, x, y, button);
 880                 } else {
 881                         inset_hit->Edit(this, x, y, button);
 882                 }
 883                 return;
 884         }
 885
 886         // check whether we want to open a float
 887         if (text) {
 888                 bool hit = false;
 889                 char c = ' ';
 890                 if (text->cursor.pos <
 891                     text->cursor.par->Last()) {
 892                         c = text->cursor.par->
 893                                 GetChar(text->cursor.pos);
 894                 }
 895                 if (c == LyXParagraph::META_FOOTNOTE
 896                     || c == LyXParagraph::META_MARGIN
 897                     || c == LyXParagraph::META_FIG
 898                     || c == LyXParagraph::META_TAB
 899                     || c == LyXParagraph::META_WIDE_FIG
 900                     || c == LyXParagraph::META_WIDE_TAB
 901                     || c == LyXParagraph::META_ALGORITHM){
 902                         hit = true;
 903                 } else if (text->cursor.pos - 1 >= 0) {
 904                         c = text->cursor.par->
 905                                 GetChar(text->cursor.pos - 1);
 906                         if (c == LyXParagraph::META_FOOTNOTE
 907                             || c == LyXParagraph::META_MARGIN
 908                             || c == LyXParagraph::META_FIG
 909                             || c == LyXParagraph::META_TAB
 910                             || c == LyXParagraph::META_WIDE_FIG
 911                             || c == LyXParagraph::META_WIDE_TAB
 912                             || c == LyXParagraph::META_ALGORITHM){
 913                                 // We are one step too far to the right
 914                                 text->CursorLeft();
 915                                 hit = true;
 916                         }
 917                 }
 918                 if (hit == true) {
 919                         toggleFloat();
 920                         selection_possible = false;
 921                         return;
 922                 }
 923         }
 924
 925         // Do we want to close a float? (click on the float-label)
 926         if (text->cursor.row->par->footnoteflag ==
 927             LyXParagraph::OPEN_FOOTNOTE
 928             //&& text->cursor.pos == 0
 929             && text->cursor.row->previous &&
 930             text->cursor.row->previous->par->
 931             footnoteflag != LyXParagraph::OPEN_FOOTNOTE){
 932                 LyXFont font(LyXFont::ALL_SANE);
 933                 font.setSize(LyXFont::SIZE_FOOTNOTE);
 934
 935                 int box_x = 20; // LYX_PAPER_MARGIN;
 936                 box_x += font.textWidth(" wide-tab ", 10);
 937
 938                 int screen_first = screen->first;
 939
 940                 if (x < box_x
 941                     && y + screen_first > text->cursor.y -
 942                     text->cursor.row->baseline
 943                     && y + screen_first < text->cursor.y -
 944                     text->cursor.row->baseline
 945                     + font.maxAscent() * 1.2 + font.maxDescent() * 1.2) {
 946                         toggleFloat();
 947                         selection_possible = false;
 948                         return;
 949                 }
 950         }
 951
 952         // Maybe we want to edit a bibitem ale970302
 953         if (text->cursor.par->bibkey && x < 20 +
 954             bibitemMaxWidth(painter(),
 955                             textclasslist
 956                             .TextClass(buffer_->
 957                                        params.textclass).defaultfont())) {
 958                 text->cursor.par->bibkey->Edit(this, 0, 0, 0);
 959         }
 960
 961         return;
 962 }
 963
 964
 965 /*
 966  * Returns an inset if inset was hit. 0 otherwise.
 967  * If hit, the coordinates are changed relative to the inset.
 968  * Otherwise coordinates are not changed, and false is returned.
 969  */
 970 Inset * BufferView::checkInsetHit(int & x, int & y)
 971 {
 972         if (!screen)
 973                 return 0;
 974
 975         int y_tmp = y + screen->first;
 976
 977         LyXCursor & old_cursor = text->cursor;
 978         text->SetCursorFromCoordinates(x,y);
 979         LyXCursor & cursor = text->cursor;
 980
 981         bool is_rtl = text->real_current_font.isVisibleRightToLeft();
 982
 983         if (cursor.pos < cursor.par->Last()
 984             && cursor.par->GetChar(cursor.pos) == LyXParagraph::META_INSET
 985             && cursor.par->GetInset(cursor.pos)
 986             && cursor.par->GetInset(cursor.pos)->Editable()) {
 987
 988                 // Check whether the inset really was hit
 989                 Inset * tmpinset = cursor.par->GetInset(cursor.pos);
 990                 LyXFont font = text->GetFont(cursor.par, cursor.pos);
 991                 int start_x, end_x;
 992                 if (is_rtl) {
 993                         start_x = cursor.x - tmpinset->width(painter(), font);
 994                         end_x = cursor.x;
 995                 } else {
 996                         start_x = cursor.x;
 997                         end_x = cursor.x + tmpinset->width(painter(), font);
 998                 }
 999
1000                 if (x > start_x && x < end_x
1001                     && y_tmp > cursor.y - tmpinset->ascent(painter(), font)
1002                     && y_tmp < cursor.y + tmpinset->descent(painter(), font)) {
1003                         x = x - start_x;
1004                         // The origin of an inset is on the baseline
1005                         y = y_tmp - (cursor.y);
1006                         return tmpinset;
1007                 }
1008         }
1009
1010         if ((cursor.pos - 1 >= 0) &&
1011             (cursor.par->GetChar(cursor.pos-1) == LyXParagraph::META_INSET) &&
1012             (cursor.par->GetInset(cursor.pos - 1)) &&
1013             (cursor.par->GetInset(cursor.pos - 1)->Editable())) {
1014                 text->CursorLeft();
1015                 Inset * tmpinset = cursor.par->GetInset(cursor.pos);
1016                 LyXFont font = text->GetFont(cursor.par, cursor.pos);
1017                 int start_x, end_x;
1018                 if (is_rtl) {
1019                         start_x = cursor.x - tmpinset->width(painter(), font);
1020                         end_x = cursor.x;
1021                 } else {
1022                         start_x = cursor.x;
1023                         end_x = cursor.x + tmpinset->width(painter(), font);
1024                 }
1025                 if (x > start_x && x < end_x
1026                     && y_tmp > cursor.y - tmpinset->ascent(painter(), font)
1027                     && y_tmp < cursor.y + tmpinset->descent(painter(), font)) {
1028                         x = x - start_x;
1029                         // The origin of an inset is on the baseline
1030                         y = y_tmp - (cursor.y);
1031                         return tmpinset;
1032                 } else {
1033                         text->CursorRight();
1034                 }
1035         }
1036         text->SetCursor(old_cursor.par, old_cursor.pos);
1037         return 0;
1038 }
1039
1040 void BufferView::workAreaExpose()
1041 {
1042         // this is a hack to ensure that we only call this through
1043         // BufferView::redraw().
1044         //if (!lgb_hack) {
1045         //      redraw();
1046         //}
1047
1048         static int work_area_width = -1;
1049         static int work_area_height = -1;
1050
1051         bool widthChange = workarea->workWidth() != work_area_width;
1052         bool heightChange = workarea->height() != work_area_height;
1053
1054         // update from work area
1055         work_area_width = workarea->workWidth();
1056         work_area_height = workarea->height();
1057         if (buffer_ != 0) {
1058                 if (widthChange) {
1059                         // All buffers need a resize
1060                         bufferlist.resize();
1061
1062                         // Remove all texts from the textcache
1063                         // This is not _really_ what we want to do. What
1064                         // we really want to do is to delete in textcache
1065                         // that does not have a BufferView with matching
1066                         // width, but as long as we have only one BufferView
1067                         // deleting all gives the same result.
1068                         if (lyxerr.debugging())
1069                                 textcache.show(lyxerr, "Expose delete all");
1070                         textcache.clear();
1071                 } else if (heightChange) {
1072                         // Rebuild image of current screen
1073                         updateScreen();
1074                         // fitCursor() ensures we don't jump back
1075                         // to the start of the document on vertical
1076                         // resize
1077                         fitCursor();
1078
1079                         // The main window size has changed, repaint most stuff
1080                         redraw();
1081                         // ...including the minibuffer
1082                         owner_->getMiniBuffer()->Init();
1083
1084                 } else if (screen) screen->Redraw();
1085         } else {
1086                 // Grey box when we don't have a buffer
1087                 workarea->greyOut();
1088         }
1089
1090         // always make sure that the scrollbar is sane.
1091         updateScrollbar();
1092         owner_->updateLayoutChoice();
1093         return;
1094 }
1095
1096
1097 // Callback for cursor timer
1098 void BufferView::cursorToggleCB(FL_OBJECT * ob, long)
1099 {
1100         BufferView * view = static_cast<BufferView*>(ob->u_vdata);
1101
1102         // Quite a nice place for asyncron Inset updating, isn't it?
1103         // Actually no! This is run even if no buffer exist... so (Lgb)
1104         if (view && !view->buffer_) {
1105                 goto set_timer_and_return;
1106         }
1107
1108         // NOTE:
1109         // On my quest to solve the gs render hangups I am now
1110         // disabling the SIGHUP completely, and will do a wait
1111         // now and then instead. If the guess that xforms somehow
1112         // destroys something is true, this is likely (hopefully)
1113         // to solve the problem...at least I hope so. Lgb
1114
1115         // ...Ok this seems to work...at least it does not make things
1116         // worse so far. However I still see gs processes that hangs.
1117         // I would really like to know _why_ they are hanging. Anyway
1118         // the solution without the SIGCHLD handler seems to be easier
1119         // to debug.
1120
1121         // When attaching gdb to a a running gs that hangs it shows
1122         // that it is waiting for input(?) Is it possible for us to
1123         // provide that input somehow? Or figure what it is expecing
1124         // to read?
1125
1126         // One solution is to, after some time, look if there are some
1127         // old gs processes still running and if there are: kill them
1128         // and re render.
1129
1130         // Another solution is to provide the user an option to rerender
1131         // a picture. This would, for the picture in question, check if
1132         // there is a gs running for it, if so kill it, and start a new
1133         // rendering process.
1134
1135         // these comments posted to lyx@via
1136         {
1137                 int status = 1;
1138                 int pid = waitpid(static_cast<pid_t>(0), &status, WNOHANG);
1139                 if (pid == -1) // error find out what is wrong
1140                         ; // ignore it for now.
1141                 else if (pid > 0)
1142                         sigchldhandler(pid, &status);
1143         }
1144
1145         view->updatelist.update(view);
1146
1147         if (view && !view->screen){
1148                 goto set_timer_and_return;
1149         }
1150
1151         if (view->lyx_focus && view->work_area_focus) {
1152                 if (!view->the_locking_inset) {
1153                         view->screen->CursorToggle();
1154                 } else {
1155                         view->the_locking_inset->
1156                                 ToggleInsetCursor(view);
1157                 }
1158                 goto set_timer_and_return;
1159         } else {
1160                 // Make sure that the cursor is visible.
1161                 if (!view->the_locking_inset) {
1162                         view->screen->ShowCursor();
1163                 } else {
1164                         if (!view->the_locking_inset->isCursorVisible())
1165                                 view->the_locking_inset->
1166                                         ToggleInsetCursor(view);
1167                 }
1168                 // This is only run when work_area_focus or lyx_focus is false.
1169                 Window tmpwin;
1170                 int tmp;
1171                 XGetInputFocus(fl_display, &tmpwin, &tmp);
1172                 // Commenting this out, we have not had problems with this
1173                 // for a long time. We will probably work on this code later
1174                 // and we can reenable this debug code then. Now it only
1175                 // anoying when debugging. (Lgb)
1176                 //if (lyxerr.debugging(Debug::INFO)) {
1177                 //      lyxerr << "tmpwin: " << tmpwin
1178                 //             << "\nwindow: " << view->owner_->getForm()->window
1179                 //             << "\nwork_area_focus: " << view->work_area_focus
1180                 //             << "\nlyx_focus      : " << view->lyx_focus
1181                 //             << endl;
1182                 //}
1183                 if (tmpwin != view->owner_->getForm()->window) {
1184                         view->lyx_focus = false;
1185                         goto skip_timer;
1186                 } else {
1187                         view->lyx_focus = true;
1188                         if (!view->work_area_focus)
1189                                 goto skip_timer;
1190                         else
1191                                 goto set_timer_and_return;
1192                 }
1193         }
1194
1195   set_timer_and_return:
1196         fl_set_timer(ob, 0.4);
1197   skip_timer:
1198         return;
1199 }
1200
1201
1202 static
1203 string fromClipboard(Window win, XEvent * event)
1204 {
1205         string strret;
1206         if (event->xselection.type == XA_STRING
1207             && event->xselection.property) {
1208                 Atom tmpatom;
1209                 unsigned long ul1;
1210                 unsigned long ul2;
1211                 unsigned char * uc = 0;
1212                 int tmpint;
1213                 if (XGetWindowProperty(
1214                         event->xselection.display,  // display
1215                         win,                        // w
1216                         event->xselection.property, // property
1217                         0,                          // long_offset
1218                         0,                          // logn_length
1219                         False,                      // delete
1220                         XA_STRING,                  // req_type
1221                         &tmpatom,                   // actual_type_return
1222                         &tmpint,                    // actual_format_return
1223                         &ul1,
1224                         &ul2,
1225                         &uc                         // prop_return
1226                         ) != Success) {
1227                         return strret;
1228                 }
1229                 if (uc) {
1230                         free(uc);
1231                         uc = 0;
1232                 }
1233                 if (XGetWindowProperty(
1234                         event->xselection.display,             // display
1235                         win,                        // w
1236                         event->xselection.property, // property
1237                         0,                          // long_offset
1238                         ul2/4+1,                    // long_length
1239                         True,                       // delete
1240                         XA_STRING,                  // req_type
1241                         &tmpatom,                   // actual_type_return
1242                         &tmpint,                    // actual_format_return
1243                         &ul1,                       // nitems_return
1244                         &ul2,                       // bytes_after_return
1245                         &uc                         // prop_return */
1246                         ) != Success) {
1247                         return strret;
1248                 }
1249                 if (uc) {
1250                         strret = reinterpret_cast<char*>(uc);
1251                         free(uc); // yes free!
1252                         uc = 0;
1253                 }
1254         }
1255         return strret;
1256 }
1257
1258
1259 void BufferView::workAreaSelectionNotify(Window win, XEvent * event)
1260 {
1261         if (buffer_ == 0) return;
1262
1263         screen->HideCursor();
1264         beforeChange();
1265         string clb = fromClipboard(win, event);
1266         if (!clb.empty()) {
1267                 if (!ascii_type)
1268                         text->InsertStringA(clb);
1269                 else
1270                         text->InsertStringB(clb);
1271
1272                 update(1);
1273
1274         }
1275 }
1276
1277
1278 void BufferView::cursorPrevious()
1279 {
1280         if (!text->cursor.row->previous) return;
1281
1282         long y = screen->first;
1283         Row * cursorrow = text->cursor.row;
1284         text->SetCursorFromCoordinates(text->cursor.x_fix, y);
1285         text->FinishUndo();
1286         // This is to allow jumping over large insets
1287         if ((cursorrow == text->cursor.row))
1288                 text->CursorUp();
1289
1290         if (text->cursor.row->height < workarea->height())
1291                 screen->Draw(text->cursor.y
1292                                   - text->cursor.row->baseline
1293                                   + text->cursor.row->height
1294                                   - workarea->height() + 1 );
1295 }
1296
1297
1298 void BufferView::cursorNext()
1299 {
1300         if (!text->cursor.row->next) return;
1301
1302         long y = screen->first;
1303         text->GetRowNearY(y);
1304         Row * cursorrow = text->cursor.row;
1305         text->SetCursorFromCoordinates(text->cursor.x_fix, y
1306                                        + workarea->height());
1307         text->FinishUndo();
1308         // This is to allow jumping over large insets
1309         if ((cursorrow == text->cursor.row))
1310                 text->CursorDown();
1311
1312         if (text->cursor.row->height < workarea->height())
1313                 screen->Draw(text->cursor.y
1314                                   - text->cursor.row->baseline);
1315 }
1316
1317
1318 bool BufferView::available() const
1319 {
1320         if (buffer_ && text) return true;
1321         return false;
1322 }
1323
1324
1325 void BufferView::beforeChange()
1326 {
1327         toggleSelection();
1328         text->ClearSelection();
1329         FreeUpdateTimer();
1330 }
1331
1332
1333 void BufferView::savePosition()
1334 {
1335         backstack.push(buffer()->fileName(),
1336                        text->cursor.x,
1337                        text->cursor.y);
1338 }
1339
1340
1341 void BufferView::restorePosition()
1342 {
1343         if (backstack.empty()) return;
1344
1345         int  x, y;
1346         string fname = backstack.pop(&x, &y);
1347
1348         beforeChange();
1349         Buffer * b = bufferlist.exists(fname) ?
1350                 bufferlist.getBuffer(fname) :
1351                 bufferlist.loadLyXFile(fname); // don't ask, just load it
1352         buffer(b);
1353         text->SetCursorFromCoordinates(x, y);
1354         update(0);
1355 }
1356
1357
1358 void BufferView::update(signed char f)
1359 {
1360         owner()->updateLayoutChoice();
1361
1362         if (!text->selection && f > -3)
1363                 text->sel_cursor = text->cursor;
1364
1365         FreeUpdateTimer();
1366         text->FullRebreak();
1367
1368         update();
1369
1370         if (f != 3 && f != -3) {
1371                 fitCursor();
1372                 updateScrollbar();
1373         }
1374
1375         if (f == 1 || f == -1) {
1376                 if (buffer()->isLyxClean()) {
1377                         buffer()->markDirty();
1378                         owner()->getMiniBuffer()->setTimer(4);
1379                 } else {
1380                         buffer()->markDirty();
1381                 }
1382         }
1383 }
1384
1385
1386 void BufferView::smallUpdate(signed char f)
1387 {
1388         screen->SmallUpdate();
1389         if (screen->TopCursorVisible()
1390             != screen->first) {
1391                 update(f);
1392                 return;
1393         }
1394
1395         fitCursor();
1396         updateScrollbar();
1397
1398         if (!text->selection)
1399                 text->sel_cursor = text->cursor;
1400
1401         if (f == 1 || f == -1) {
1402                 if (buffer()->isLyxClean()) {
1403                         buffer()->markDirty();
1404                         owner()->getMiniBuffer()->setTimer(4);
1405                 } else {
1406                         buffer()->markDirty();
1407                 }
1408         }
1409 }
1410
1411
1412 void BufferView::setState()
1413 {
1414         if (!lyxrc.rtl_support)
1415                 return;
1416
1417         if (text->real_current_font.isVisibleRightToLeft()) {
1418                 if (owner_->getIntl()->primarykeymap)
1419                         owner_->getIntl()->KeyMapSec();
1420         } else {
1421                 if (!owner_->getIntl()->primarykeymap)
1422                         owner_->getIntl()->KeyMapPrim();
1423         }
1424 }
1425
1426
1427 void BufferView::insetSleep()
1428 {
1429         if (the_locking_inset && !inset_slept) {
1430                 the_locking_inset->GetCursorPos(slx, sly);
1431                 the_locking_inset->InsetUnlock(this);
1432                 inset_slept = true;
1433         }
1434 }
1435
1436
1437 void BufferView::insetWakeup()
1438 {
1439         if (the_locking_inset && inset_slept) {
1440                 the_locking_inset->Edit(this, slx, sly, 0);
1441                 inset_slept = false;
1442         }
1443 }
1444
1445
1446 void BufferView::insetUnlock()
1447 {
1448         if (the_locking_inset) {
1449                 if (!inset_slept) the_locking_inset->InsetUnlock(this);
1450                 the_locking_inset = 0;
1451                 text->FinishUndo();
1452                 inset_slept = false;
1453         }
1454 }
1455
1456
1457 bool BufferView::focus() const
1458 {
1459         return workarea->hasFocus();
1460 }
1461
1462
1463 void BufferView::focus(bool f)
1464 {
1465         if (f) workarea->setFocus();
1466 }
1467
1468
1469 bool BufferView::active() const
1470 {
1471         return workarea->active();
1472 }
1473
1474
1475 Painter & BufferView::getPainter() const
1476 {
1477     return workarea->getPainter();
1478 }
1479
1480
1481 unsigned short BufferView::paperWidth() const
1482 {
1483     return text->paperWidth();
1484 }
1485
1486
1487 bool BufferView::belowMouse() const
1488 {
1489         return workarea->belowMouse();
1490 }
1491
1492
1493 void BufferView::showCursor()
1494 {
1495         if (screen)
1496                 screen->ShowCursor();
1497 }
1498
1499
1500 void BufferView::hideCursor()
1501 {
1502         if (screen)
1503                 screen->HideCursor();
1504 }
1505
1506
1507 void BufferView::toggleSelection(bool b)
1508 {
1509         if (screen)
1510                 screen->ToggleSelection(b);
1511 }
1512
1513
1514 void BufferView::toggleToggle()
1515 {
1516         if (screen)
1517                 screen->ToggleToggle();
1518 }
1519
1520
1521 void BufferView::center()
1522 {
1523         beforeChange();
1524         if (text->cursor.y > workarea->height() / 2) {
1525                 screen->Draw(text->cursor.y - workarea->height() / 2);
1526         } else {
1527                 screen->Draw(0);
1528         }
1529         update(0);
1530         redraw();
1531 }