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