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
  16 #include <cstdlib>
  17 #include <csignal>
  18
  19 #include <unistd.h>
  20 #include <sys/wait.h>
  21
  22 #include "support/lstrings.h"
  23
  24 #ifdef __GNUG__
  25 #pragma implementation
  26 #endif
  27
  28 #include "commandtags.h"
  29 #include "BufferView.h"
  30 #include "bufferlist.h"
  31 #include "LyXView.h"
  32 #include "lyxfunc.h"
  33 #include "insets/lyxinset.h"
  34 #include "insets/insetbib.h"
  35 #include "minibuffer.h"
  36 #include "lyxscreen.h"
  37
  38 #include "debug.h"
  39 #include "lyx_gui_misc.h"
  40 #include "BackStack.h"
  41 #include "lyxtext.h"
  42 #include "lyx_cb.h"
  43 #include "gettext.h"
  44 #include "layout.h"
  45 #include "TextCache.h"
  46 #include "intl.h"
  47 #include "lyxrc.h"
  48 #include "lyxrow.h"
  49 #include "WorkArea.h"
  50 #include "font.h"
  51
  52 using std::pair;
  53 using std::for_each;
  54 using std::find_if;
  55 using std::endl;
  56
  57 extern BufferList bufferlist;
  58
  59 void sigchldhandler(pid_t pid, int * status);
  60
  61 extern void SetXtermCursor(Window win);
  62 extern bool input_prohibited;
  63 extern bool selection_possible;
  64 extern char ascii_type;
  65 extern void MenuPasteSelection(char at);
  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, button);
 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 == the_locking_inset) {
 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         if (!inset_hit)
 680                 selection_possible = true;
 681         screen->HideCursor();
 682
 683         // Right button mouse click on a table
 684         if (button == 3 &&
 685             (text->cursor.par->table ||
 686              text->MouseHitInTable(xpos, ypos + screen->first))) {
 687                 // Set the cursor to the press-position
 688                 text->SetCursorFromCoordinates(xpos, ypos + screen->first);
 689                 bool doit = true;
 690
 691                 // Only show the table popup if the hit is in
 692                 // the table, too
 693                 if (!text->HitInTable(text->cursor.row, xpos))
 694                         doit = false;
 695
 696                 // Hit above or below the table?
 697                 if (doit) {
 698                         if (!text->selection) {
 699                                 screen->ToggleSelection();
 700                                 text->ClearSelection();
 701                                 text->FullRebreak();
 702                                 screen->Update();
 703                                 updateScrollbar();
 704                         }
 705                         // Popup table popup when on a table.
 706                         // This is obviously temporary, since we
 707                         // should be able to popup various
 708                         // context-sensitive-menus with the
 709                         // the right mouse. So this should be done more
 710                         // general in the future. Matthias.
 711                         selection_possible = false;
 712                         owner_->getLyXFunc()
 713                                 ->Dispatch(LFUN_LAYOUT_TABLE,
 714                                            "true");
 715                         return;
 716                 }
 717         }
 718
 719         int screen_first = screen->first;
 720
 721         // Middle button press pastes if we have a selection
 722         bool paste_internally = false;
 723         if (button == 2
 724             && text->selection) {
 725                 owner_->getLyXFunc()->Dispatch(LFUN_COPY);
 726                 paste_internally = true;
 727         }
 728
 729         // Clear the selection
 730         screen->ToggleSelection();
 731         text->ClearSelection();
 732         text->FullRebreak();
 733         screen->Update();
 734         updateScrollbar();
 735
 736         // Single left click in math inset?
 737         if ((inset_hit != 0) &&
 738             (inset_hit->Editable()==Inset::HIGHLY_EDITABLE)) {
 739                 // Highly editable inset, like math
 740                 UpdatableInset *inset = (UpdatableInset *)inset_hit;
 741                 selection_possible = false;
 742                 owner_->updateLayoutChoice();
 743                 owner_->getMiniBuffer()->Set(inset->EditMessage());
 744                 inset->InsetButtonPress(this, xpos, ypos, button);
 745                 inset->Edit(this, xpos, ypos, button);
 746                 return;
 747         }
 748
 749         // Right click on a footnote flag opens float menu
 750         if (button == 3) {
 751                 selection_possible = false;
 752                 return;
 753         }
 754
 755         if (!inset_hit) // otherwise it was already set in checkInsetHit(...)
 756                 text->SetCursorFromCoordinates(xpos, ypos + screen_first);
 757         text->FinishUndo();
 758         text->sel_cursor = text->cursor;
 759         text->cursor.x_fix = text->cursor.x;
 760
 761         owner_->updateLayoutChoice();
 762         if (screen->FitCursor()){
 763                 updateScrollbar();
 764                 selection_possible = false;
 765         }
 766
 767         // Insert primary selection with middle mouse
 768         // if there is a local selection in the current buffer,
 769         // insert this
 770         if (button == 2) {
 771                 if (paste_internally)
 772                         owner_->getLyXFunc()->Dispatch(LFUN_PASTE);
 773                 else
 774                         owner_->getLyXFunc()->Dispatch(LFUN_PASTESELECTION,
 775                                                        "paragraph");
 776                 selection_possible = false;
 777                 return;
 778         }
 779 }
 780
 781
 782 void BufferView::doubleClick(int /*x*/, int /*y*/, unsigned int button)
 783 {
 784         // select a word
 785         if (buffer_ && !the_locking_inset) {
 786                 if (screen && button == 1) {
 787                         screen->HideCursor();
 788                         screen->ToggleSelection();
 789                         text->SelectWord();
 790                         screen->ToggleSelection(false);
 791                         /* This will fit the cursor on the screen
 792                          * if necessary */
 793                         update(0);
 794                 }
 795         }
 796 }
 797
 798
 799 void BufferView::tripleClick(int /*x*/, int /*y*/, unsigned int button)
 800 {
 801         // select a line
 802         if (buffer_ && screen && button == 1) {
 803                 screen->HideCursor();
 804                 screen->ToggleSelection();
 805                 text->CursorHome();
 806                 text->sel_cursor = text->cursor;
 807                 text->CursorEnd();
 808                 text->SetSelection();
 809                 screen->ToggleSelection(false);
 810                 /* This will fit the cursor on the screen
 811                  * if necessary */
 812                 update(0);
 813         }
 814 }
 815
 816
 817 void BufferView::workAreaButtonRelease(int x, int y, unsigned int button)
 818 {
 819         if (buffer_ == 0 || screen == 0) return;
 820
 821         // If we hit an inset, we have the inset coordinates in these
 822         // and inset_hit points to the inset.  If we do not hit an
 823         // inset, inset_hit is 0, and inset_x == x, inset_y == y.
 824         Inset * inset_hit = checkInsetHit(x, y, button);
 825
 826         if (the_locking_inset) {
 827                 // We are in inset locking mode.
 828
 829                 /* LyX does a kind of work-area grabbing for insets.
 830                    Only a ButtonPress Event outside the inset will
 831                    force a InsetUnlock. */
 832                 the_locking_inset->
 833                         InsetButtonRelease(this, x, y, button);
 834                 return;
 835         }
 836
 837         selection_possible = false;
 838         if (text->cursor.par->table) {
 839                 int cell = text->
 840                         NumberOfCell(text->cursor.par,
 841                                      text->cursor.pos);
 842                 if (text->cursor.par->table->IsContRow(cell) &&
 843                     text->cursor.par->table->
 844                     CellHasContRow(text->cursor.par->table->
 845                                    GetCellAbove(cell))<0) {
 846                         text->CursorUp();
 847                 }
 848         }
 849
 850         if (button >= 2) return;
 851
 852         setState();
 853         owner_->getMiniBuffer()->Set(CurrentState());
 854
 855         // Did we hit an editable inset?
 856         if (inset_hit != 0) {
 857                 // Inset like error, notes and figures
 858                 selection_possible = false;
 859 #ifdef WITH_WARNINGS
 860 #warning fix this proper in 0.13
 861 #endif
 862                 // Following a ref shouldn't issue
 863                 // a push on the undo-stack
 864                 // anylonger, now that we have
 865                 // keybindings for following
 866                 // references and returning from
 867                 // references.  IMHO though, it
 868                 // should be the inset's own business
 869                 // to push or not push on the undo
 870                 // stack. They don't *have* to
 871                 // alter the document...
 872                 // (Joacim)
 873                 // ...or maybe the SetCursorParUndo()
 874                 // below isn't necessary at all anylonger?
 875                 if (inset_hit->LyxCode() == Inset::REF_CODE) {
 876                         text->SetCursorParUndo();
 877                 }
 878
 879                 owner_->getMiniBuffer()->Set(inset_hit->EditMessage());
 880                 if (inset_hit->Editable()==Inset::HIGHLY_EDITABLE) {
 881                         // Highly editable inset, like math
 882                         UpdatableInset *inset = (UpdatableInset *)inset_hit;
 883                         inset->InsetButtonRelease(this, x, y, button);
 884                 } else {
 885                         inset_hit->Edit(this, x, y, button);
 886                 }
 887                 return;
 888         }
 889
 890         // check whether we want to open a float
 891         if (text) {
 892                 bool hit = false;
 893                 char c = ' ';
 894                 if (text->cursor.pos <
 895                     text->cursor.par->Last()) {
 896                         c = text->cursor.par->
 897                                 GetChar(text->cursor.pos);
 898                 }
 899                 if (c == LyXParagraph::META_FOOTNOTE
 900                     || c == LyXParagraph::META_MARGIN
 901                     || c == LyXParagraph::META_FIG
 902                     || c == LyXParagraph::META_TAB
 903                     || c == LyXParagraph::META_WIDE_FIG
 904                     || c == LyXParagraph::META_WIDE_TAB
 905                     || c == LyXParagraph::META_ALGORITHM){
 906                         hit = true;
 907                 } else if (text->cursor.pos - 1 >= 0) {
 908                         c = text->cursor.par->
 909                                 GetChar(text->cursor.pos - 1);
 910                         if (c == LyXParagraph::META_FOOTNOTE
 911                             || c == LyXParagraph::META_MARGIN
 912                             || c == LyXParagraph::META_FIG
 913                             || c == LyXParagraph::META_TAB
 914                             || c == LyXParagraph::META_WIDE_FIG
 915                             || c == LyXParagraph::META_WIDE_TAB
 916                             || c == LyXParagraph::META_ALGORITHM){
 917                                 // We are one step too far to the right
 918                                 text->CursorLeft();
 919                                 hit = true;
 920                         }
 921                 }
 922                 if (hit == true) {
 923                         toggleFloat();
 924                         selection_possible = false;
 925                         return;
 926                 }
 927         }
 928
 929         // Do we want to close a float? (click on the float-label)
 930         if (text->cursor.row->par->footnoteflag ==
 931             LyXParagraph::OPEN_FOOTNOTE
 932             //&& text->cursor.pos == 0
 933             && text->cursor.row->previous &&
 934             text->cursor.row->previous->par->
 935             footnoteflag != LyXParagraph::OPEN_FOOTNOTE){
 936                 LyXFont font(LyXFont::ALL_SANE);
 937                 font.setSize(LyXFont::SIZE_FOOTNOTE);
 938
 939                 int box_x = 20; // LYX_PAPER_MARGIN;
 940                 box_x += lyxfont::width(" wide-tab ", font);
 941
 942                 int screen_first = screen->first;
 943
 944                 if (x < box_x
 945                     && y + screen_first > text->cursor.y -
 946                     text->cursor.row->baseline
 947                     && y + screen_first < text->cursor.y -
 948                     text->cursor.row->baseline
 949                     + lyxfont::maxAscent(font) * 1.2 + lyxfont::maxDescent(font) * 1.2) {
 950                         toggleFloat();
 951                         selection_possible = false;
 952                         return;
 953                 }
 954         }
 955
 956         // Maybe we want to edit a bibitem ale970302
 957         if (text->cursor.par->bibkey && x < 20 +
 958             bibitemMaxWidth(painter(),
 959                             textclasslist
 960                             .TextClass(buffer_->
 961                                        params.textclass).defaultfont())) {
 962                 text->cursor.par->bibkey->Edit(this, 0, 0, 0);
 963         }
 964
 965         return;
 966 }
 967
 968
 969 /*
 970  * Returns an inset if inset was hit. 0 otherwise.
 971  * If hit, the coordinates are changed relative to the inset.
 972  * Otherwise coordinates are not changed, and false is returned.
 973  */
 974 Inset * BufferView::checkInsetHit(int & x, int & y, unsigned int button)
 975 {
 976         if (!screen)
 977                 return 0;
 978
 979         int y_tmp = y + screen->first;
 980
 981         LyXCursor cursor;
 982         text->SetCursorFromCoordinates(cursor, x, y_tmp);
 983 #if 1
 984         bool move_cursor = true;
 985 #else
 986         bool move_cursor = ((cursor.par != text->cursor.par) ||
 987                             (cursor.pos != text->cursor.pos)) && (button < 2);
 988 #endif
 989
 990         if (cursor.pos < cursor.par->Last()
 991             && cursor.par->GetChar(cursor.pos) == LyXParagraph::META_INSET
 992             && cursor.par->GetInset(cursor.pos)
 993             && cursor.par->GetInset(cursor.pos)->Editable()) {
 994
 995                 // Check whether the inset really was hit
 996                 Inset * tmpinset = cursor.par->GetInset(cursor.pos);
 997                 LyXFont font = text->GetFont(cursor.par, cursor.pos);
 998                 bool is_rtl = font.isVisibleRightToLeft();
 999                 int start_x, end_x;
1000
1001                 if (is_rtl) {
1002                         start_x = cursor.x - tmpinset->width(painter(), font);
1003                         end_x = cursor.x;
1004                 } else {
1005                         start_x = cursor.x;
1006                         end_x = cursor.x + tmpinset->width(painter(), font);
1007                 }
1008
1009                 if (x > start_x && x < end_x
1010                     && y_tmp > cursor.y - tmpinset->ascent(painter(), font)
1011                     && y_tmp < cursor.y + tmpinset->descent(painter(), font)) {
1012                         if (move_cursor)
1013                                 text->SetCursorFromCoordinates(x, y_tmp);
1014                         x = x - start_x;
1015                         // The origin of an inset is on the baseline
1016                         y = y_tmp - (text->cursor.y);
1017                         return tmpinset;
1018                 }
1019         }
1020
1021         if ((cursor.pos - 1 >= 0) &&
1022             (cursor.par->GetChar(cursor.pos-1) == LyXParagraph::META_INSET) &&
1023             (cursor.par->GetInset(cursor.pos - 1)) &&
1024             (cursor.par->GetInset(cursor.pos - 1)->Editable())) {
1025                 Inset * tmpinset = cursor.par->GetInset(cursor.pos-1);
1026                 LyXFont font = text->GetFont(cursor.par, cursor.pos-1);
1027                 bool is_rtl = font.isVisibleRightToLeft();
1028                 int start_x, end_x;
1029
1030                 if (!is_rtl) {
1031                         start_x = cursor.x - tmpinset->width(painter(), font);
1032                         end_x = cursor.x;
1033                 } else {
1034                         start_x = cursor.x;
1035                         end_x = cursor.x + tmpinset->width(painter(), font);
1036                 }
1037                 if (x > start_x && x < end_x
1038                     && y_tmp > cursor.y - tmpinset->ascent(painter(), font)
1039                     && y_tmp < cursor.y + tmpinset->descent(painter(), font)) {
1040                         if (move_cursor)
1041                                 text->SetCursorFromCoordinates(x, y_tmp);
1042                         x = x - start_x;
1043                         // The origin of an inset is on the baseline
1044                         y = y_tmp - (text->cursor.y);
1045                         return tmpinset;
1046                 }
1047         }
1048         return 0;
1049 }
1050
1051 void BufferView::workAreaExpose()
1052 {
1053         // this is a hack to ensure that we only call this through
1054         // BufferView::redraw().
1055         //if (!lgb_hack) {
1056         //      redraw();
1057         //}
1058
1059         static int work_area_width = -1;
1060         static int work_area_height = -1;
1061
1062         bool widthChange = workarea->workWidth() != work_area_width;
1063         bool heightChange = workarea->height() != work_area_height;
1064
1065         // update from work area
1066         work_area_width = workarea->workWidth();
1067         work_area_height = workarea->height();
1068         if (buffer_ != 0) {
1069                 if (widthChange) {
1070                         // All buffers need a resize
1071                         bufferlist.resize();
1072
1073                         // Remove all texts from the textcache
1074                         // This is not _really_ what we want to do. What
1075                         // we really want to do is to delete in textcache
1076                         // that does not have a BufferView with matching
1077                         // width, but as long as we have only one BufferView
1078                         // deleting all gives the same result.
1079                         if (lyxerr.debugging())
1080                                 textcache.show(lyxerr, "Expose delete all");
1081                         textcache.clear();
1082                 } else if (heightChange) {
1083                         // Rebuild image of current screen
1084                         updateScreen();
1085                         // fitCursor() ensures we don't jump back
1086                         // to the start of the document on vertical
1087                         // resize
1088                         fitCursor();
1089
1090                         // The main window size has changed, repaint most stuff
1091                         redraw();
1092                         // ...including the minibuffer
1093                         owner_->getMiniBuffer()->Init();
1094
1095                 } else if (screen) screen->Redraw();
1096         } else {
1097                 // Grey box when we don't have a buffer
1098                 workarea->greyOut();
1099         }
1100
1101         // always make sure that the scrollbar is sane.
1102         updateScrollbar();
1103         owner_->updateLayoutChoice();
1104         return;
1105 }
1106
1107
1108 // Callback for cursor timer
1109 void BufferView::cursorToggleCB(FL_OBJECT * ob, long)
1110 {
1111         BufferView * view = static_cast<BufferView*>(ob->u_vdata);
1112
1113         // Quite a nice place for asyncron Inset updating, isn't it?
1114         // Actually no! This is run even if no buffer exist... so (Lgb)
1115         if (view && !view->buffer_) {
1116                 goto set_timer_and_return;
1117         }
1118
1119         // NOTE:
1120         // On my quest to solve the gs render hangups I am now
1121         // disabling the SIGHUP completely, and will do a wait
1122         // now and then instead. If the guess that xforms somehow
1123         // destroys something is true, this is likely (hopefully)
1124         // to solve the problem...at least I hope so. Lgb
1125
1126         // ...Ok this seems to work...at least it does not make things
1127         // worse so far. However I still see gs processes that hangs.
1128         // I would really like to know _why_ they are hanging. Anyway
1129         // the solution without the SIGCHLD handler seems to be easier
1130         // to debug.
1131
1132         // When attaching gdb to a a running gs that hangs it shows
1133         // that it is waiting for input(?) Is it possible for us to
1134         // provide that input somehow? Or figure what it is expecing
1135         // to read?
1136
1137         // One solution is to, after some time, look if there are some
1138         // old gs processes still running and if there are: kill them
1139         // and re render.
1140
1141         // Another solution is to provide the user an option to rerender
1142         // a picture. This would, for the picture in question, check if
1143         // there is a gs running for it, if so kill it, and start a new
1144         // rendering process.
1145
1146         // these comments posted to lyx@via
1147         {
1148                 int status = 1;
1149                 int pid = waitpid(static_cast<pid_t>(0), &status, WNOHANG);
1150                 if (pid == -1) // error find out what is wrong
1151                         ; // ignore it for now.
1152                 else if (pid > 0)
1153                         sigchldhandler(pid, &status);
1154         }
1155
1156         view->updatelist.update(view);
1157
1158         if (view && !view->screen){
1159                 goto set_timer_and_return;
1160         }
1161
1162         if (view->lyx_focus && view->work_area_focus) {
1163                 if (!view->the_locking_inset) {
1164                         view->screen->CursorToggle();
1165                 } else {
1166                         view->the_locking_inset->
1167                                 ToggleInsetCursor(view);
1168                 }
1169                 goto set_timer_and_return;
1170         } else {
1171                 // Make sure that the cursor is visible.
1172                 if (!view->the_locking_inset) {
1173                         view->screen->ShowCursor();
1174                 } else {
1175                         if (!view->the_locking_inset->isCursorVisible())
1176                                 view->the_locking_inset->
1177                                         ToggleInsetCursor(view);
1178                 }
1179                 // This is only run when work_area_focus or lyx_focus is false.
1180                 Window tmpwin;
1181                 int tmp;
1182                 XGetInputFocus(fl_display, &tmpwin, &tmp);
1183                 // Commenting this out, we have not had problems with this
1184                 // for a long time. We will probably work on this code later
1185                 // and we can reenable this debug code then. Now it only
1186                 // anoying when debugging. (Lgb)
1187                 //if (lyxerr.debugging(Debug::INFO)) {
1188                 //      lyxerr << "tmpwin: " << tmpwin
1189                 //             << "\nwindow: " << view->owner_->getForm()->window
1190                 //             << "\nwork_area_focus: " << view->work_area_focus
1191                 //             << "\nlyx_focus      : " << view->lyx_focus
1192                 //             << endl;
1193                 //}
1194                 if (tmpwin != view->owner_->getForm()->window) {
1195                         view->lyx_focus = false;
1196                         goto skip_timer;
1197                 } else {
1198                         view->lyx_focus = true;
1199                         if (!view->work_area_focus)
1200                                 goto skip_timer;
1201                         else
1202                                 goto set_timer_and_return;
1203                 }
1204         }
1205
1206   set_timer_and_return:
1207         fl_set_timer(ob, 0.4);
1208   skip_timer:
1209         return;
1210 }
1211
1212
1213 static
1214 string fromClipboard(Window win, XEvent * event)
1215 {
1216         string strret;
1217         if (event->xselection.type == XA_STRING
1218             && event->xselection.property) {
1219                 Atom tmpatom;
1220                 unsigned long ul1;
1221                 unsigned long ul2;
1222                 unsigned char * uc = 0;
1223                 int tmpint;
1224                 if (XGetWindowProperty(
1225                         event->xselection.display,  // display
1226                         win,                        // w
1227                         event->xselection.property, // property
1228                         0,                          // long_offset
1229                         0,                          // logn_length
1230                         False,                      // delete
1231                         XA_STRING,                  // req_type
1232                         &tmpatom,                   // actual_type_return
1233                         &tmpint,                    // actual_format_return
1234                         &ul1,
1235                         &ul2,
1236                         &uc                         // prop_return
1237                         ) != Success) {
1238                         return strret;
1239                 }
1240                 if (uc) {
1241                         free(uc);
1242                         uc = 0;
1243                 }
1244                 if (XGetWindowProperty(
1245                         event->xselection.display,             // display
1246                         win,                        // w
1247                         event->xselection.property, // property
1248                         0,                          // long_offset
1249                         ul2/4+1,                    // long_length
1250                         True,                       // delete
1251                         XA_STRING,                  // req_type
1252                         &tmpatom,                   // actual_type_return
1253                         &tmpint,                    // actual_format_return
1254                         &ul1,                       // nitems_return
1255                         &ul2,                       // bytes_after_return
1256                         &uc                         // prop_return */
1257                         ) != Success) {
1258                         return strret;
1259                 }
1260                 if (uc) {
1261                         strret = reinterpret_cast<char*>(uc);
1262                         free(uc); // yes free!
1263                         uc = 0;
1264                 }
1265         }
1266         return strret;
1267 }
1268
1269
1270 void BufferView::workAreaSelectionNotify(Window win, XEvent * event)
1271 {
1272         if (buffer_ == 0) return;
1273
1274         screen->HideCursor();
1275         beforeChange();
1276         string clb = fromClipboard(win, event);
1277         if (!clb.empty()) {
1278                 if (!ascii_type)
1279                         text->InsertStringA(clb);
1280                 else
1281                         text->InsertStringB(clb);
1282
1283                 update(1);
1284
1285         }
1286 }
1287
1288
1289 void BufferView::cursorPrevious()
1290 {
1291         if (!text->cursor.row->previous) return;
1292
1293         long y = screen->first;
1294         Row * cursorrow = text->cursor.row;
1295         text->SetCursorFromCoordinates(text->cursor.x_fix, y);
1296         text->FinishUndo();
1297         // This is to allow jumping over large insets
1298         if ((cursorrow == text->cursor.row))
1299                 text->CursorUp();
1300
1301         if (text->cursor.row->height < workarea->height())
1302                 screen->Draw(text->cursor.y
1303                                   - text->cursor.row->baseline
1304                                   + text->cursor.row->height
1305                                   - workarea->height() + 1 );
1306 }
1307
1308
1309 void BufferView::cursorNext()
1310 {
1311         if (!text->cursor.row->next) return;
1312
1313         long y = screen->first;
1314         text->GetRowNearY(y);
1315         Row * cursorrow = text->cursor.row;
1316         text->SetCursorFromCoordinates(text->cursor.x_fix, y
1317                                        + workarea->height());
1318         text->FinishUndo();
1319         // This is to allow jumping over large insets
1320         if ((cursorrow == text->cursor.row))
1321                 text->CursorDown();
1322
1323         if (text->cursor.row->height < workarea->height())
1324                 screen->Draw(text->cursor.y
1325                                   - text->cursor.row->baseline);
1326 }
1327
1328
1329 bool BufferView::available() const
1330 {
1331         if (buffer_ && text) return true;
1332         return false;
1333 }
1334
1335
1336 void BufferView::beforeChange()
1337 {
1338         toggleSelection();
1339         text->ClearSelection();
1340         FreeUpdateTimer();
1341 }
1342
1343
1344 void BufferView::savePosition()
1345 {
1346         backstack.push(buffer()->fileName(),
1347                        text->cursor.x,
1348                        text->cursor.y);
1349 }
1350
1351
1352 void BufferView::restorePosition()
1353 {
1354         if (backstack.empty()) return;
1355
1356         int  x, y;
1357         string fname = backstack.pop(&x, &y);
1358
1359         beforeChange();
1360         Buffer * b = bufferlist.exists(fname) ?
1361                 bufferlist.getBuffer(fname) :
1362                 bufferlist.loadLyXFile(fname); // don't ask, just load it
1363         buffer(b);
1364         text->SetCursorFromCoordinates(x, y);
1365         update(0);
1366 }
1367
1368
1369 void BufferView::update(signed char f)
1370 {
1371         owner()->updateLayoutChoice();
1372
1373         if (!text->selection && f > -3)
1374                 text->sel_cursor = text->cursor;
1375
1376         FreeUpdateTimer();
1377         text->FullRebreak();
1378
1379         update();
1380
1381         if (f != 3 && f != -3) {
1382                 fitCursor();
1383                 updateScrollbar();
1384         }
1385
1386         if (f == 1 || f == -1) {
1387                 if (buffer()->isLyxClean()) {
1388                         buffer()->markDirty();
1389                         owner()->getMiniBuffer()->setTimer(4);
1390                 } else {
1391                         buffer()->markDirty();
1392                 }
1393         }
1394 }
1395
1396
1397 void BufferView::smallUpdate(signed char f)
1398 {
1399         screen->SmallUpdate();
1400         if (screen->TopCursorVisible()
1401             != screen->first) {
1402                 update(f);
1403                 return;
1404         }
1405
1406         fitCursor();
1407         updateScrollbar();
1408
1409         if (!text->selection)
1410                 text->sel_cursor = text->cursor;
1411
1412         if (f == 1 || f == -1) {
1413                 if (buffer()->isLyxClean()) {
1414                         buffer()->markDirty();
1415                         owner()->getMiniBuffer()->setTimer(4);
1416                 } else {
1417                         buffer()->markDirty();
1418                 }
1419         }
1420 }
1421
1422
1423 void BufferView::setState()
1424 {
1425         if (!lyxrc.rtl_support)
1426                 return;
1427
1428         if (text->real_current_font.isVisibleRightToLeft()) {
1429                 if (owner_->getIntl()->primarykeymap)
1430                         owner_->getIntl()->KeyMapSec();
1431         } else {
1432                 if (!owner_->getIntl()->primarykeymap)
1433                         owner_->getIntl()->KeyMapPrim();
1434         }
1435 }
1436
1437
1438 void BufferView::insetSleep()
1439 {
1440         if (the_locking_inset && !inset_slept) {
1441                 the_locking_inset->GetCursorPos(slx, sly);
1442                 the_locking_inset->InsetUnlock(this);
1443                 inset_slept = true;
1444         }
1445 }
1446
1447
1448 void BufferView::insetWakeup()
1449 {
1450         if (the_locking_inset && inset_slept) {
1451                 the_locking_inset->Edit(this, slx, sly, 0);
1452                 inset_slept = false;
1453         }
1454 }
1455
1456
1457 void BufferView::insetUnlock()
1458 {
1459         if (the_locking_inset) {
1460                 if (!inset_slept) the_locking_inset->InsetUnlock(this);
1461                 the_locking_inset = 0;
1462                 text->FinishUndo();
1463                 inset_slept = false;
1464         }
1465 }
1466
1467
1468 bool BufferView::focus() const
1469 {
1470         return workarea->hasFocus();
1471 }
1472
1473
1474 void BufferView::focus(bool f)
1475 {
1476         if (f) workarea->setFocus();
1477 }
1478
1479
1480 bool BufferView::active() const
1481 {
1482         return workarea->active();
1483 }
1484
1485
1486 Painter & BufferView::getPainter() const
1487 {
1488     return workarea->getPainter();
1489 }
1490
1491
1492 unsigned short BufferView::paperWidth() const
1493 {
1494     return text->paperWidth();
1495 }
1496
1497
1498 bool BufferView::belowMouse() const
1499 {
1500         return workarea->belowMouse();
1501 }
1502
1503
1504 void BufferView::showCursor()
1505 {
1506         if (screen)
1507                 screen->ShowCursor();
1508 }
1509
1510
1511 void BufferView::hideCursor()
1512 {
1513         if (screen)
1514                 screen->HideCursor();
1515 }
1516
1517
1518 void BufferView::toggleSelection(bool b)
1519 {
1520         if (screen)
1521                 screen->ToggleSelection(b);
1522 }
1523
1524
1525 void BufferView::toggleToggle()
1526 {
1527         if (screen)
1528                 screen->ToggleToggle();
1529 }
1530
1531
1532 void BufferView::center()
1533 {
1534         beforeChange();
1535         if (text->cursor.y > workarea->height() / 2) {
1536                 screen->Draw(text->cursor.y - workarea->height() / 2);
1537         } else {
1538                 screen->Draw(0);
1539         }
1540         update(0);
1541         redraw();
1542 }