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
  51 using std::for_each;
  52 using std::find_if;
  53 using std::endl;
  54
  55 extern BufferList bufferlist;
  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 void FreeUpdateTimer();
  65
  66 BufferView::BufferView(LyXView * o, int xpos, int ypos,
  67                        int width, int height)
  68         : owner_(o)
  69 {
  70         buffer_ = 0;
  71         text = 0;
  72         workarea = new WorkArea(this, xpos, ypos, width, height);
  73         screen = 0;
  74         timer_cursor = 0;
  75         create_view();
  76         current_scrollbar_value = 0;
  77         // Activate the timer for the cursor
  78         fl_set_timer(timer_cursor, 0.4);
  79         workarea->setFocus();
  80         work_area_focus = true;
  81         lyx_focus = false;
  82         the_locking_inset = 0;
  83         inset_slept = false;
  84 }
  85
  86
  87 BufferView::~BufferView()
  88 {
  89         delete text;
  90 }
  91
  92
  93 Painter & BufferView::painter()
  94 {
  95         return workarea->getPainter();
  96 }
  97
  98
  99 void BufferView::buffer(Buffer * b)
 100 {
 101         lyxerr[Debug::INFO] << "Setting buffer in BufferView ("
 102                             << b << ")" << endl;
 103         if (buffer_) {
 104                 insetSleep();
 105                 buffer_->delUser(this);
 106
 107                 // Put the old text into the TextCache, but
 108                 // only if the buffer is still loaded.
 109                 // Also set the owner of the test to 0
 110                 text->owner(0);
 111                 textcache.add(text);
 112                 if (lyxerr.debugging())
 113                         textcache.show(lyxerr, "BufferView::buffer");
 114
 115                 text = 0;
 116         }
 117
 118         // Set current buffer
 119         buffer_ = b;
 120
 121         if (bufferlist.getState() == BufferList::CLOSING) return;
 122
 123         // Nuke old image
 124         // screen is always deleted when the buffer is changed.
 125         delete screen;
 126         screen = 0;
 127
 128         // If we are closing the buffer, use the first buffer as current
 129         if (!buffer_) {
 130                 buffer_ = bufferlist.first();
 131         }
 132
 133         if (buffer_) {
 134                 lyxerr[Debug::INFO] << "Buffer addr: " << buffer_ << endl;
 135                 buffer_->addUser(this);
 136                 owner_->getMenus()->showMenus();
 137                 // If we don't have a text object for this, we make one
 138                 if (text == 0)
 139                         resizeCurrentBuffer();
 140                 else {
 141                         updateScreen();
 142                         updateScrollbar();
 143                 }
 144                 screen->first = screen->TopCursorVisible();
 145                 redraw();
 146                 updateAllVisibleBufferRelatedPopups();
 147                 insetWakeup();
 148         } else {
 149                 lyxerr[Debug::INFO] << "  No Buffer!" << endl;
 150                 owner_->getMenus()->hideMenus();
 151                 updateScrollbar();
 152                 workarea->redraw();
 153
 154                 // Also remove all remaining text's from the testcache.
 155                 // (there should not be any!) (if there is any it is a
 156                 // bug!)
 157                 if (lyxerr.debugging())
 158                         textcache.show(lyxerr, "buffer delete all");
 159                 textcache.clear();
 160         }
 161         // should update layoutchoice even if we don't have a buffer.
 162         owner_->updateLayoutChoice();
 163         owner_->getMiniBuffer()->Init();
 164         owner_->updateWindowTitle();
 165 }
 166
 167
 168 void BufferView::updateScreen()
 169 {
 170         // Regenerate the screen.
 171         delete screen;
 172         screen = new LyXScreen(*workarea, text);
 173 }
 174
 175
 176 void BufferView::resize(int xpos, int ypos, int width, int height)
 177 {
 178         workarea->resize(xpos, ypos, width, height);
 179         update(3);
 180         redraw();
 181 }
 182
 183
 184 void BufferView::resize()
 185 {
 186         // This will resize the buffer. (Asger)
 187         if (buffer_)
 188                 resizeCurrentBuffer();
 189 }
 190
 191
 192 void BufferView::redraw()
 193 {
 194         lyxerr[Debug::INFO] << "BufferView::redraw()" << endl;
 195         workarea->redraw();
 196 }
 197
 198
 199 void BufferView::fitCursor()
 200 {
 201         if (screen) screen->FitCursor();
 202         updateScrollbar();
 203 }
 204
 205
 206 void BufferView::update()
 207 {
 208         if (screen) screen->Update();
 209 }
 210
 211
 212 void BufferView::updateScrollbar()
 213 {
 214         /* If the text is smaller than the working area, the scrollbar
 215          * maximum must be the working area height. No scrolling will
 216          * be possible */
 217
 218         if (!buffer_) {
 219                 workarea->setScrollbar(0, 1.0);
 220                 return;
 221         }
 222
 223         static long max2 = 0;
 224         static long height2 = 0;
 225
 226         long cbth = 0;
 227         long cbsf = 0;
 228
 229         if (text)
 230                 cbth = text->height;
 231         if (screen)
 232                 cbsf = screen->first;
 233
 234         // check if anything has changed.
 235         if (max2 == cbth &&
 236             height2 == workarea->height() &&
 237             current_scrollbar_value == cbsf)
 238                 return; // no
 239         max2 = cbth;
 240         height2 = workarea->height();
 241         current_scrollbar_value = cbsf;
 242
 243         if (cbth <= height2) { // text is smaller than screen
 244                 workarea->setScrollbar(0, 1.0); // right?
 245                 return;
 246         }
 247
 248         long maximum_height = workarea->height() * 3 / 4 + cbth;
 249         long value = cbsf;
 250
 251         // set the scrollbar
 252         double hfloat = workarea->height();
 253         double maxfloat = maximum_height;
 254
 255         float slider_size = 0.0;
 256         int slider_value = value;
 257
 258         workarea->setScrollbarBounds(0, text->height - workarea->height());
 259         double lineh = text->DefaultHeight();
 260         workarea->setScrollbarIncrements(lineh);
 261         if (maxfloat > 0.0) {
 262                 if ((hfloat / maxfloat) * float(height2) < 3)
 263                         slider_size = 3.0/float(height2);
 264                 else
 265                         slider_size = hfloat / maxfloat;
 266         } else
 267                 slider_size = hfloat;
 268
 269         workarea->setScrollbar(slider_value, slider_size / workarea->height());
 270 }
 271
 272
 273 void BufferView::redoCurrentBuffer()
 274 {
 275         lyxerr[Debug::INFO] << "BufferView::redoCurrentBuffer" << endl;
 276         if (buffer_ && text) {
 277                 resize();
 278                 owner_->updateLayoutChoice();
 279         }
 280 }
 281
 282
 283 int BufferView::resizeCurrentBuffer()
 284 {
 285         lyxerr[Debug::INFO] << "resizeCurrentBuffer" << endl;
 286
 287         LyXParagraph * par = 0;
 288         LyXParagraph * selstartpar = 0;
 289         LyXParagraph * selendpar = 0;
 290         int pos = 0;
 291         int selstartpos = 0;
 292         int selendpos = 0;
 293         int selection = 0;
 294         int mark_set = 0;
 295
 296         ProhibitInput();
 297
 298         owner_->getMiniBuffer()->Set(_("Formatting document..."));
 299
 300         if (text) {
 301                 par = text->cursor.par;
 302                 pos = text->cursor.pos;
 303                 selstartpar = text->sel_start_cursor.par;
 304                 selstartpos = text->sel_start_cursor.pos;
 305                 selendpar = text->sel_end_cursor.par;
 306                 selendpos = text->sel_end_cursor.pos;
 307                 selection = text->selection;
 308                 mark_set = text->mark_set;
 309                 delete text;
 310                 text = new LyXText(this, workarea->workWidth(), buffer_);
 311         } else {
 312                 // See if we have a text in TextCache that fits
 313                 // the new buffer_ with the correct width.
 314                 text = textcache.findFit(buffer_, workarea->workWidth());
 315                 if (text) {
 316                         if (lyxerr.debugging()) {
 317                                 lyxerr << "Found a LyXText that fits:\n";
 318                                 textcache.show(lyxerr, text);
 319                         }
 320                         // Set the owner of the newly found text
 321                         text->owner(this);
 322                         if (lyxerr.debugging())
 323                                 textcache.show(lyxerr, "resizeCurrentBuffer");
 324                 } else {
 325                         text = new LyXText(this, workarea->workWidth(), buffer_);
 326                 }
 327         }
 328         updateScreen();
 329
 330         if (par) {
 331                 text->selection = true;
 332                 /* at this point just to avoid the Delete-Empty-Paragraph
 333                  * Mechanism when setting the cursor */
 334                 text->mark_set = mark_set;
 335                 if (selection) {
 336                         text->SetCursor(selstartpar, selstartpos);
 337                         text->sel_cursor = text->cursor;
 338                         text->SetCursor(selendpar, selendpos);
 339                         text->SetSelection();
 340                         text->SetCursor(par, pos);
 341                 } else {
 342                         text->SetCursor(par, pos);
 343                         text->sel_cursor = text->cursor;
 344                         text->selection = false;
 345                 }
 346         }
 347         screen->first = screen->TopCursorVisible(); /* this will scroll the
 348                                                      * screen such that the
 349                                                      * cursor becomes
 350                                                      * visible */
 351         updateScrollbar();
 352         redraw();
 353         owner_->getMiniBuffer()->Init();
 354         setState();
 355         AllowInput();
 356
 357         // Now if the title form still exist kill it
 358         TimerCB(0, 0);
 359
 360         return 0;
 361 }
 362
 363
 364 void BufferView::gotoError()
 365 {
 366         if (!screen)
 367                 return;
 368
 369         screen->HideCursor();
 370         beforeChange();
 371         update(-2);
 372         LyXCursor tmp;
 373
 374         if (!text->GotoNextError()) {
 375                 if (text->cursor.pos
 376                     || text->cursor.par != text->FirstParagraph()) {
 377                         tmp = text->cursor;
 378                         text->cursor.par = text->FirstParagraph();
 379                         text->cursor.pos = 0;
 380                         if (!text->GotoNextError()) {
 381                                 text->cursor = tmp;
 382                                 owner_->getMiniBuffer()
 383                                         ->Set(_("No more errors"));
 384                                 LyXBell();
 385                         }
 386                 } else {
 387                         owner_->getMiniBuffer()->Set(_("No more errors"));
 388                         LyXBell();
 389                 }
 390         }
 391         update(0);
 392         text->sel_cursor = text->cursor;
 393 }
 394
 395
 396 extern "C" {
 397         void C_BufferView_CursorToggleCB(FL_OBJECT * ob, long buf)
 398         {
 399                 BufferView::cursorToggleCB(ob, buf);
 400         }
 401 }
 402
 403
 404 void BufferView::create_view()
 405 {
 406         FL_OBJECT * obj;
 407
 408         //
 409         // TIMERS
 410         //
 411
 412         // timer_cursor
 413         timer_cursor = obj = fl_add_timer(FL_HIDDEN_TIMER,
 414                                           0, 0, 0, 0, "Timer");
 415         fl_set_object_callback(obj, C_BufferView_CursorToggleCB, 0);
 416         obj->u_vdata = this;
 417 }
 418
 419
 420 // Callback for scrollbar up button
 421 void BufferView::upCB(long time, int button)
 422 {
 423         if (buffer_ == 0) return;
 424
 425         switch (button) {
 426         case 3:
 427                 scrollUpOnePage();
 428                 break;
 429         case 2:
 430                 scrollDownOnePage();
 431                 break;
 432         default:
 433                 scrollUp(time);
 434                 break;
 435         }
 436 }
 437
 438
 439 static inline
 440 void waitForX()
 441 {
 442         XSync(fl_get_display(), 0);
 443 }
 444
 445
 446 // Callback for scrollbar slider
 447 void BufferView::scrollCB(double value)
 448 {
 449         extern bool cursor_follows_scrollbar;
 450
 451         if (buffer_ == 0) return;
 452
 453         current_scrollbar_value = long(value);
 454         if (current_scrollbar_value < 0)
 455                 current_scrollbar_value = 0;
 456
 457         if (!screen)
 458                 return;
 459
 460         screen->Draw(current_scrollbar_value);
 461
 462         if (cursor_follows_scrollbar) {
 463                 LyXText * vbt = text;
 464                 int height = vbt->DefaultHeight();
 465
 466                 if (vbt->cursor.y < screen->first + height) {
 467                         vbt->SetCursorFromCoordinates(0,
 468                                                       screen->first +
 469                                                       height);
 470                 } else if (vbt->cursor.y >
 471                            screen->first + workarea->height() - height) {
 472                         vbt->SetCursorFromCoordinates(0,
 473                                                       screen->first +
 474                                                       workarea->height()  -
 475                                                       height);
 476                 }
 477         }
 478         waitForX();
 479 }
 480
 481
 482 // Callback for scrollbar down button
 483 void BufferView::downCB(long time, int button)
 484 {
 485         if (buffer_ == 0) return;
 486
 487         switch (button) {
 488         case 2:
 489                 scrollUpOnePage();
 490                 break;
 491         case 3:
 492                 scrollDownOnePage();
 493                 break;
 494         default:
 495                 scrollDown(time);
 496                 break;
 497         }
 498 }
 499
 500
 501 int BufferView::scrollUp(long time)
 502 {
 503         if (buffer_ == 0) return 0;
 504         if (!screen) return 0;
 505
 506         double value = workarea->getScrollbarValue();
 507
 508         if (value == 0) return 0;
 509
 510         float add_value =  (text->DefaultHeight()
 511                             + float(time) * float(time) * 0.125);
 512
 513         if (add_value > workarea->height())
 514                 add_value = float(workarea->height() -
 515                                   text->DefaultHeight());
 516
 517         value -= add_value;
 518
 519         if (value < 0)
 520                 value = 0;
 521
 522         workarea->setScrollbarValue(value);
 523
 524         scrollCB(value);
 525         return 0;
 526 }
 527
 528
 529 int BufferView::scrollDown(long time)
 530 {
 531         if (buffer_ == 0) return 0;
 532         if (!screen) return 0;
 533
 534         double value= workarea->getScrollbarValue();
 535         pair<double, double> p = workarea->getScrollbarBounds();
 536         double max = p.second;
 537
 538         if (value == max) return 0;
 539
 540         float add_value =  (text->DefaultHeight()
 541                             + float(time) * float(time) * 0.125);
 542
 543         if (add_value > workarea->height())
 544                 add_value = float(workarea->height() -
 545                                   text->DefaultHeight());
 546
 547         value += add_value;
 548
 549         if (value > max)
 550                 value = max;
 551
 552         workarea->setScrollbarValue(value);
 553
 554         scrollCB(value);
 555         return 0;
 556 }
 557
 558
 559 void BufferView::scrollUpOnePage()
 560 {
 561         if (buffer_ == 0) return;
 562         if (!screen) return;
 563
 564         long y = screen->first;
 565
 566         if (!y) return;
 567
 568         Row * row = text->GetRowNearY(y);
 569
 570         y = y - workarea->height() + row->height;
 571
 572         workarea->setScrollbarValue(y);
 573
 574         scrollCB(y);
 575 }
 576
 577
 578 void BufferView::scrollDownOnePage()
 579 {
 580         if (buffer_ == 0) return;
 581         if (!screen) return;
 582
 583         long y = screen->first;
 584
 585         if (y > text->height - workarea->height())
 586                 return;
 587
 588         y += workarea->height();
 589         text->GetRowNearY(y);
 590
 591         workarea->setScrollbarValue(y);
 592
 593         scrollCB(y);
 594 }
 595
 596
 597 void BufferView::workAreaMotionNotify(int x, int y, unsigned int state)
 598 {
 599         if (buffer_ == 0 || !screen) return;
 600
 601         // Check for inset locking
 602         if (the_locking_inset) {
 603                 LyXCursor cursor = text->cursor;
 604                 the_locking_inset->
 605                         InsetMotionNotify(this,
 606                                           x - cursor.x,
 607                                           y - cursor.y,
 608                                           state);
 609                 return;
 610         }
 611
 612         // Only use motion with button 1
 613         if (!state & Button1MotionMask)
 614                 return;
 615
 616         /* The selection possible is needed, that only motion events are
 617          * used, where the bottom press event was on the drawing area too */
 618         if (selection_possible) {
 619                 screen->HideCursor();
 620
 621                 text->SetCursorFromCoordinates(x, y + screen->first);
 622
 623                 if (!text->selection)
 624                         update(-3); // Maybe an empty line was deleted
 625
 626                 text->SetSelection();
 627                 screen->ToggleToggle();
 628                 if (screen->FitCursor())
 629                         updateScrollbar();
 630                 screen->ShowCursor();
 631         }
 632         return;
 633 }
 634
 635
 636 extern int bibitemMaxWidth(Painter &, LyXFont const &);
 637
 638
 639 // Single-click on work area
 640 void BufferView::workAreaButtonPress(int xpos, int ypos, unsigned int button)
 641 {
 642         last_click_x = -1;
 643         last_click_y = -1;
 644
 645         if (buffer_ == 0 || !screen) return;
 646
 647         Inset * inset_hit = checkInsetHit(xpos, ypos, button);
 648
 649         // ok ok, this is a hack.
 650         if (button == 4 || button == 5) {
 651                 switch (button) {
 652                 case 4:
 653                         scrollUp(100); // This number is only temporary
 654                         break;
 655                 case 5:
 656                         scrollDown(100);
 657                         break;
 658                 }
 659         }
 660
 661         if (the_locking_inset) {
 662                 // We are in inset locking mode
 663
 664                 /* Check whether the inset was hit. If not reset mode,
 665                    otherwise give the event to the inset */
 666                 if (inset_hit == the_locking_inset) {
 667                         the_locking_inset->
 668                                 InsetButtonPress(this,
 669                                                  xpos, ypos,
 670                                                  button);
 671                         return;
 672                 } else {
 673                         unlockInset(the_locking_inset);
 674                 }
 675         }
 676
 677         if (!inset_hit)
 678                 selection_possible = true;
 679         screen->HideCursor();
 680
 681         // Right button mouse click on a table
 682         if (button == 3 &&
 683             (text->cursor.par->table ||
 684              text->MouseHitInTable(xpos, ypos + screen->first))) {
 685                 // Set the cursor to the press-position
 686                 text->SetCursorFromCoordinates(xpos, ypos + screen->first);
 687                 bool doit = true;
 688
 689                 // Only show the table popup if the hit is in
 690                 // the table, too
 691                 if (!text->HitInTable(text->cursor.row, xpos))
 692                         doit = false;
 693
 694                 // Hit above or below the table?
 695                 if (doit) {
 696                         if (!text->selection) {
 697                                 screen->ToggleSelection();
 698                                 text->ClearSelection();
 699                                 text->FullRebreak();
 700                                 screen->Update();
 701                                 updateScrollbar();
 702                         }
 703                         // Popup table popup when on a table.
 704                         // This is obviously temporary, since we
 705                         // should be able to popup various
 706                         // context-sensitive-menus with the
 707                         // the right mouse. So this should be done more
 708                         // general in the future. Matthias.
 709                         selection_possible = false;
 710                         owner_->getLyXFunc()
 711                                 ->Dispatch(LFUN_LAYOUT_TABLE,
 712                                            "true");
 713                         return;
 714                 }
 715         }
 716
 717         int screen_first = screen->first;
 718
 719         // Middle button press pastes if we have a selection
 720         bool paste_internally = false;
 721         if (button == 2
 722             && text->selection) {
 723                 owner_->getLyXFunc()->Dispatch(LFUN_COPY);
 724                 paste_internally = true;
 725         }
 726
 727         // Clear the selection
 728         screen->ToggleSelection();
 729         text->ClearSelection();
 730         text->FullRebreak();
 731         screen->Update();
 732         updateScrollbar();
 733
 734         // Single left click in math inset?
 735         if ((inset_hit != 0) &&
 736             (inset_hit->Editable()==Inset::HIGHLY_EDITABLE)) {
 737                 // Highly editable inset, like math
 738                 UpdatableInset *inset = (UpdatableInset *)inset_hit;
 739                 selection_possible = false;
 740                 owner_->updateLayoutChoice();
 741                 owner_->getMiniBuffer()->Set(inset->EditMessage());
 742                 inset->InsetButtonPress(this, xpos, ypos, button);
 743                 inset->Edit(this, xpos, ypos, button);
 744                 return;
 745         }
 746
 747         // Right click on a footnote flag opens float menu
 748         if (button == 3) {
 749                 selection_possible = false;
 750                 return;
 751         }
 752
 753         if (!inset_hit) // otherwise it was already set in checkInsetHit(...)
 754                 text->SetCursorFromCoordinates(xpos, ypos + screen_first);
 755         text->FinishUndo();
 756         text->sel_cursor = text->cursor;
 757         text->cursor.x_fix = text->cursor.x;
 758
 759         owner_->updateLayoutChoice();
 760         if (screen->FitCursor()){
 761                 updateScrollbar();
 762                 selection_possible = false;
 763         }
 764
 765         // Insert primary selection with middle mouse
 766         // if there is a local selection in the current buffer,
 767         // insert this
 768         if (button == 2) {
 769                 if (paste_internally)
 770                         owner_->getLyXFunc()->Dispatch(LFUN_PASTE);
 771                 else
 772                         owner_->getLyXFunc()->Dispatch(LFUN_PASTESELECTION,
 773                                                        "paragraph");
 774                 selection_possible = false;
 775                 return;
 776         }
 777 }
 778
 779
 780 void BufferView::doubleClick(int /*x*/, int /*y*/, unsigned int button)
 781 {
 782         // select a word
 783         if (buffer_ && !the_locking_inset) {
 784                 if (screen && button == 1) {
 785                         screen->HideCursor();
 786                         screen->ToggleSelection();
 787                         text->SelectWord();
 788                         screen->ToggleSelection(false);
 789                         /* This will fit the cursor on the screen
 790                          * if necessary */
 791                         update(0);
 792                 }
 793         }
 794 }
 795
 796
 797 void BufferView::tripleClick(int /*x*/, int /*y*/, unsigned int button)
 798 {
 799         // select a line
 800         if (buffer_ && screen && button == 1) {
 801                 screen->HideCursor();
 802                 screen->ToggleSelection();
 803                 text->CursorHome();
 804                 text->sel_cursor = text->cursor;
 805                 text->CursorEnd();
 806                 text->SetSelection();
 807                 screen->ToggleSelection(false);
 808                 /* This will fit the cursor on the screen
 809                  * if necessary */
 810                 update(0);
 811         }
 812 }
 813
 814
 815 void BufferView::workAreaButtonRelease(int x, int y, unsigned int button)
 816 {
 817         if (buffer_ == 0 || screen == 0) return;
 818
 819         // If we hit an inset, we have the inset coordinates in these
 820         // and inset_hit points to the inset.  If we do not hit an
 821         // inset, inset_hit is 0, and inset_x == x, inset_y == y.
 822         Inset * inset_hit = checkInsetHit(x, y, button);
 823
 824         if (the_locking_inset) {
 825                 // We are in inset locking mode.
 826
 827                 /* LyX does a kind of work-area grabbing for insets.
 828                    Only a ButtonPress Event outside the inset will
 829                    force a InsetUnlock. */
 830                 the_locking_inset->
 831                         InsetButtonRelease(this, x, y, button);
 832                 return;
 833         }
 834
 835         selection_possible = false;
 836         if (text->cursor.par->table) {
 837                 int cell = text->
 838                         NumberOfCell(text->cursor.par,
 839                                      text->cursor.pos);
 840                 if (text->cursor.par->table->IsContRow(cell) &&
 841                     text->cursor.par->table->
 842                     CellHasContRow(text->cursor.par->table->
 843                                    GetCellAbove(cell))<0) {
 844                         text->CursorUp();
 845                 }
 846         }
 847
 848         if (button >= 2) return;
 849
 850         setState();
 851         owner_->getMiniBuffer()->Set(CurrentState());
 852
 853         // Did we hit an editable inset?
 854         if (inset_hit != 0) {
 855                 // Inset like error, notes and figures
 856                 selection_possible = false;
 857 #ifdef WITH_WARNINGS
 858 #warning fix this proper in 0.13
 859 #endif
 860                 // Following a ref shouldn't issue
 861                 // a push on the undo-stack
 862                 // anylonger, now that we have
 863                 // keybindings for following
 864                 // references and returning from
 865                 // references.  IMHO though, it
 866                 // should be the inset's own business
 867                 // to push or not push on the undo
 868                 // stack. They don't *have* to
 869                 // alter the document...
 870                 // (Joacim)
 871                 // ...or maybe the SetCursorParUndo()
 872                 // below isn't necessary at all anylonger?
 873                 if (inset_hit->LyxCode() == Inset::REF_CODE) {
 874                         text->SetCursorParUndo();
 875                 }
 876
 877                 owner_->getMiniBuffer()->Set(inset_hit->EditMessage());
 878                 if (inset_hit->Editable()==Inset::HIGHLY_EDITABLE) {
 879                         // Highly editable inset, like math
 880                         UpdatableInset *inset = (UpdatableInset *)inset_hit;
 881                         inset->InsetButtonRelease(this, x, y, button);
 882                 } else {
 883                         inset_hit->Edit(this, x, y, button);
 884                 }
 885                 return;
 886         }
 887
 888         // check whether we want to open a float
 889         if (text) {
 890                 bool hit = false;
 891                 char c = ' ';
 892                 if (text->cursor.pos <
 893                     text->cursor.par->Last()) {
 894                         c = text->cursor.par->
 895                                 GetChar(text->cursor.pos);
 896                 }
 897                 if (c == LyXParagraph::META_FOOTNOTE
 898                     || c == LyXParagraph::META_MARGIN
 899                     || c == LyXParagraph::META_FIG
 900                     || c == LyXParagraph::META_TAB
 901                     || c == LyXParagraph::META_WIDE_FIG
 902                     || c == LyXParagraph::META_WIDE_TAB
 903                     || c == LyXParagraph::META_ALGORITHM){
 904                         hit = true;
 905                 } else if (text->cursor.pos - 1 >= 0) {
 906                         c = text->cursor.par->
 907                                 GetChar(text->cursor.pos - 1);
 908                         if (c == LyXParagraph::META_FOOTNOTE
 909                             || c == LyXParagraph::META_MARGIN
 910                             || c == LyXParagraph::META_FIG
 911                             || c == LyXParagraph::META_TAB
 912                             || c == LyXParagraph::META_WIDE_FIG
 913                             || c == LyXParagraph::META_WIDE_TAB
 914                             || c == LyXParagraph::META_ALGORITHM){
 915                                 // We are one step too far to the right
 916                                 text->CursorLeft();
 917                                 hit = true;
 918                         }
 919                 }
 920                 if (hit == true) {
 921                         toggleFloat();
 922                         selection_possible = false;
 923                         return;
 924                 }
 925         }
 926
 927         // Do we want to close a float? (click on the float-label)
 928         if (text->cursor.row->par->footnoteflag ==
 929             LyXParagraph::OPEN_FOOTNOTE
 930             //&& text->cursor.pos == 0
 931             && text->cursor.row->previous &&
 932             text->cursor.row->previous->par->
 933             footnoteflag != LyXParagraph::OPEN_FOOTNOTE){
 934                 LyXFont font(LyXFont::ALL_SANE);
 935                 font.setSize(LyXFont::SIZE_FOOTNOTE);
 936
 937                 int box_x = 20; // LYX_PAPER_MARGIN;
 938                 box_x += font.textWidth(" wide-tab ", 10);
 939
 940                 int screen_first = screen->first;
 941
 942                 if (x < box_x
 943                     && y + screen_first > text->cursor.y -
 944                     text->cursor.row->baseline
 945                     && y + screen_first < text->cursor.y -
 946                     text->cursor.row->baseline
 947                     + font.maxAscent() * 1.2 + font.maxDescent() * 1.2) {
 948                         toggleFloat();
 949                         selection_possible = false;
 950                         return;
 951                 }
 952         }
 953
 954         // Maybe we want to edit a bibitem ale970302
 955         if (text->cursor.par->bibkey && x < 20 +
 956             bibitemMaxWidth(painter(),
 957                             textclasslist
 958                             .TextClass(buffer_->
 959                                        params.textclass).defaultfont())) {
 960                 text->cursor.par->bibkey->Edit(this, 0, 0, 0);
 961         }
 962
 963         return;
 964 }
 965
 966
 967 /*
 968  * Returns an inset if inset was hit. 0 otherwise.
 969  * If hit, the coordinates are changed relative to the inset.
 970  * Otherwise coordinates are not changed, and false is returned.
 971  */
 972 Inset * BufferView::checkInsetHit(int & x, int & y, unsigned int button)
 973 {
 974         if (!screen)
 975                 return 0;
 976
 977         int y_tmp = y + screen->first;
 978
 979         LyXCursor cursor;
 980         text->SetCursorFromCoordinates(cursor, x, y_tmp);
 981 #if 1
 982         bool move_cursor = true;
 983 #else
 984         bool move_cursor = ((cursor.par != text->cursor.par) ||
 985                             (cursor.pos != text->cursor.pos)) && (button < 2);
 986 #endif
 987
 988         if (cursor.pos < cursor.par->Last()
 989             && cursor.par->GetChar(cursor.pos) == LyXParagraph::META_INSET
 990             && cursor.par->GetInset(cursor.pos)
 991             && cursor.par->GetInset(cursor.pos)->Editable()) {
 992
 993                 // Check whether the inset really was hit
 994                 Inset * tmpinset = cursor.par->GetInset(cursor.pos);
 995                 LyXFont font = text->GetFont(cursor.par, cursor.pos);
 996                 bool is_rtl = font.isVisibleRightToLeft();
 997                 int start_x, end_x;
 998
 999                 if (is_rtl) {
1000                         start_x = cursor.x - tmpinset->width(painter(), font);
1001                         end_x = cursor.x;
1002                 } else {
1003                         start_x = cursor.x;
1004                         end_x = cursor.x + tmpinset->width(painter(), font);
1005                 }
1006
1007                 if (x > start_x && x < end_x
1008                     && y_tmp > cursor.y - tmpinset->ascent(painter(), font)
1009                     && y_tmp < cursor.y + tmpinset->descent(painter(), font)) {
1010                         if (move_cursor)
1011                                 text->SetCursorFromCoordinates(x, y_tmp);
1012                         x = x - start_x;
1013                         // The origin of an inset is on the baseline
1014                         y = y_tmp - (text->cursor.y);
1015                         return tmpinset;
1016                 }
1017         }
1018
1019         if ((cursor.pos - 1 >= 0) &&
1020             (cursor.par->GetChar(cursor.pos-1) == LyXParagraph::META_INSET) &&
1021             (cursor.par->GetInset(cursor.pos - 1)) &&
1022             (cursor.par->GetInset(cursor.pos - 1)->Editable())) {
1023                 Inset * tmpinset = cursor.par->GetInset(cursor.pos-1);
1024                 LyXFont font = text->GetFont(cursor.par, cursor.pos-1);
1025                 bool is_rtl = font.isVisibleRightToLeft();
1026                 int start_x, end_x;
1027
1028                 if (!is_rtl) {
1029                         start_x = cursor.x - tmpinset->width(painter(), font);
1030                         end_x = cursor.x;
1031                 } else {
1032                         start_x = cursor.x;
1033                         end_x = cursor.x + tmpinset->width(painter(), font);
1034                 }
1035                 if (x > start_x && x < end_x
1036                     && y_tmp > cursor.y - tmpinset->ascent(painter(), font)
1037                     && y_tmp < cursor.y + tmpinset->descent(painter(), font)) {
1038                         if (move_cursor)
1039                                 text->SetCursorFromCoordinates(x, y_tmp);
1040                         x = x - start_x;
1041                         // The origin of an inset is on the baseline
1042                         y = y_tmp - (text->cursor.y);
1043                         return tmpinset;
1044                 }
1045         }
1046         return 0;
1047 }
1048
1049 void BufferView::workAreaExpose()
1050 {
1051         // this is a hack to ensure that we only call this through
1052         // BufferView::redraw().
1053         //if (!lgb_hack) {
1054         //      redraw();
1055         //}
1056
1057         static int work_area_width = -1;
1058         static int work_area_height = -1;
1059
1060         bool widthChange = workarea->workWidth() != work_area_width;
1061         bool heightChange = workarea->height() != work_area_height;
1062
1063         // update from work area
1064         work_area_width = workarea->workWidth();
1065         work_area_height = workarea->height();
1066         if (buffer_ != 0) {
1067                 if (widthChange) {
1068                         // All buffers need a resize
1069                         bufferlist.resize();
1070
1071                         // Remove all texts from the textcache
1072                         // This is not _really_ what we want to do. What
1073                         // we really want to do is to delete in textcache
1074                         // that does not have a BufferView with matching
1075                         // width, but as long as we have only one BufferView
1076                         // deleting all gives the same result.
1077                         if (lyxerr.debugging())
1078                                 textcache.show(lyxerr, "Expose delete all");
1079                         textcache.clear();
1080                 } else if (heightChange) {
1081                         // Rebuild image of current screen
1082                         updateScreen();
1083                         // fitCursor() ensures we don't jump back
1084                         // to the start of the document on vertical
1085                         // resize
1086                         fitCursor();
1087
1088                         // The main window size has changed, repaint most stuff
1089                         redraw();
1090                         // ...including the minibuffer
1091                         owner_->getMiniBuffer()->Init();
1092
1093                 } else if (screen) screen->Redraw();
1094         } else {
1095                 // Grey box when we don't have a buffer
1096                 workarea->greyOut();
1097         }
1098
1099         // always make sure that the scrollbar is sane.
1100         updateScrollbar();
1101         owner_->updateLayoutChoice();
1102         return;
1103 }
1104
1105
1106 // Callback for cursor timer
1107 void BufferView::cursorToggleCB(FL_OBJECT * ob, long)
1108 {
1109         BufferView * view = static_cast<BufferView*>(ob->u_vdata);
1110
1111         // Quite a nice place for asyncron Inset updating, isn't it?
1112         // Actually no! This is run even if no buffer exist... so (Lgb)
1113         if (view && !view->buffer_) {
1114                 goto set_timer_and_return;
1115         }
1116
1117         // NOTE:
1118         // On my quest to solve the gs render hangups I am now
1119         // disabling the SIGHUP completely, and will do a wait
1120         // now and then instead. If the guess that xforms somehow
1121         // destroys something is true, this is likely (hopefully)
1122         // to solve the problem...at least I hope so. Lgb
1123
1124         // ...Ok this seems to work...at least it does not make things
1125         // worse so far. However I still see gs processes that hangs.
1126         // I would really like to know _why_ they are hanging. Anyway
1127         // the solution without the SIGCHLD handler seems to be easier
1128         // to debug.
1129
1130         // When attaching gdb to a a running gs that hangs it shows
1131         // that it is waiting for input(?) Is it possible for us to
1132         // provide that input somehow? Or figure what it is expecing
1133         // to read?
1134
1135         // One solution is to, after some time, look if there are some
1136         // old gs processes still running and if there are: kill them
1137         // and re render.
1138
1139         // Another solution is to provide the user an option to rerender
1140         // a picture. This would, for the picture in question, check if
1141         // there is a gs running for it, if so kill it, and start a new
1142         // rendering process.
1143
1144         // these comments posted to lyx@via
1145         {
1146                 int status = 1;
1147                 int pid = waitpid(static_cast<pid_t>(0), &status, WNOHANG);
1148                 if (pid == -1) // error find out what is wrong
1149                         ; // ignore it for now.
1150                 else if (pid > 0)
1151                         sigchldhandler(pid, &status);
1152         }
1153
1154         view->updatelist.update(view);
1155
1156         if (view && !view->screen){
1157                 goto set_timer_and_return;
1158         }
1159
1160         if (view->lyx_focus && view->work_area_focus) {
1161                 if (!view->the_locking_inset) {
1162                         view->screen->CursorToggle();
1163                 } else {
1164                         view->the_locking_inset->
1165                                 ToggleInsetCursor(view);
1166                 }
1167                 goto set_timer_and_return;
1168         } else {
1169                 // Make sure that the cursor is visible.
1170                 if (!view->the_locking_inset) {
1171                         view->screen->ShowCursor();
1172                 } else {
1173                         if (!view->the_locking_inset->isCursorVisible())
1174                                 view->the_locking_inset->
1175                                         ToggleInsetCursor(view);
1176                 }
1177                 // This is only run when work_area_focus or lyx_focus is false.
1178                 Window tmpwin;
1179                 int tmp;
1180                 XGetInputFocus(fl_display, &tmpwin, &tmp);
1181                 // Commenting this out, we have not had problems with this
1182                 // for a long time. We will probably work on this code later
1183                 // and we can reenable this debug code then. Now it only
1184                 // anoying when debugging. (Lgb)
1185                 //if (lyxerr.debugging(Debug::INFO)) {
1186                 //      lyxerr << "tmpwin: " << tmpwin
1187                 //             << "\nwindow: " << view->owner_->getForm()->window
1188                 //             << "\nwork_area_focus: " << view->work_area_focus
1189                 //             << "\nlyx_focus      : " << view->lyx_focus
1190                 //             << endl;
1191                 //}
1192                 if (tmpwin != view->owner_->getForm()->window) {
1193                         view->lyx_focus = false;
1194                         goto skip_timer;
1195                 } else {
1196                         view->lyx_focus = true;
1197                         if (!view->work_area_focus)
1198                                 goto skip_timer;
1199                         else
1200                                 goto set_timer_and_return;
1201                 }
1202         }
1203
1204   set_timer_and_return:
1205         fl_set_timer(ob, 0.4);
1206   skip_timer:
1207         return;
1208 }
1209
1210
1211 static
1212 string fromClipboard(Window win, XEvent * event)
1213 {
1214         string strret;
1215         if (event->xselection.type == XA_STRING
1216             && event->xselection.property) {
1217                 Atom tmpatom;
1218                 unsigned long ul1;
1219                 unsigned long ul2;
1220                 unsigned char * uc = 0;
1221                 int tmpint;
1222                 if (XGetWindowProperty(
1223                         event->xselection.display,  // display
1224                         win,                        // w
1225                         event->xselection.property, // property
1226                         0,                          // long_offset
1227                         0,                          // logn_length
1228                         False,                      // delete
1229                         XA_STRING,                  // req_type
1230                         &tmpatom,                   // actual_type_return
1231                         &tmpint,                    // actual_format_return
1232                         &ul1,
1233                         &ul2,
1234                         &uc                         // prop_return
1235                         ) != Success) {
1236                         return strret;
1237                 }
1238                 if (uc) {
1239                         free(uc);
1240                         uc = 0;
1241                 }
1242                 if (XGetWindowProperty(
1243                         event->xselection.display,             // display
1244                         win,                        // w
1245                         event->xselection.property, // property
1246                         0,                          // long_offset
1247                         ul2/4+1,                    // long_length
1248                         True,                       // delete
1249                         XA_STRING,                  // req_type
1250                         &tmpatom,                   // actual_type_return
1251                         &tmpint,                    // actual_format_return
1252                         &ul1,                       // nitems_return
1253                         &ul2,                       // bytes_after_return
1254                         &uc                         // prop_return */
1255                         ) != Success) {
1256                         return strret;
1257                 }
1258                 if (uc) {
1259                         strret = reinterpret_cast<char*>(uc);
1260                         free(uc); // yes free!
1261                         uc = 0;
1262                 }
1263         }
1264         return strret;
1265 }
1266
1267
1268 void BufferView::workAreaSelectionNotify(Window win, XEvent * event)
1269 {
1270         if (buffer_ == 0) return;
1271
1272         screen->HideCursor();
1273         beforeChange();
1274         string clb = fromClipboard(win, event);
1275         if (!clb.empty()) {
1276                 if (!ascii_type)
1277                         text->InsertStringA(clb);
1278                 else
1279                         text->InsertStringB(clb);
1280
1281                 update(1);
1282
1283         }
1284 }
1285
1286
1287 void BufferView::cursorPrevious()
1288 {
1289         if (!text->cursor.row->previous) return;
1290
1291         long y = screen->first;
1292         Row * cursorrow = text->cursor.row;
1293         text->SetCursorFromCoordinates(text->cursor.x_fix, y);
1294         text->FinishUndo();
1295         // This is to allow jumping over large insets
1296         if ((cursorrow == text->cursor.row))
1297                 text->CursorUp();
1298
1299         if (text->cursor.row->height < workarea->height())
1300                 screen->Draw(text->cursor.y
1301                                   - text->cursor.row->baseline
1302                                   + text->cursor.row->height
1303                                   - workarea->height() + 1 );
1304 }
1305
1306
1307 void BufferView::cursorNext()
1308 {
1309         if (!text->cursor.row->next) return;
1310
1311         long y = screen->first;
1312         text->GetRowNearY(y);
1313         Row * cursorrow = text->cursor.row;
1314         text->SetCursorFromCoordinates(text->cursor.x_fix, y
1315                                        + workarea->height());
1316         text->FinishUndo();
1317         // This is to allow jumping over large insets
1318         if ((cursorrow == text->cursor.row))
1319                 text->CursorDown();
1320
1321         if (text->cursor.row->height < workarea->height())
1322                 screen->Draw(text->cursor.y
1323                                   - text->cursor.row->baseline);
1324 }
1325
1326
1327 bool BufferView::available() const
1328 {
1329         if (buffer_ && text) return true;
1330         return false;
1331 }
1332
1333
1334 void BufferView::beforeChange()
1335 {
1336         toggleSelection();
1337         text->ClearSelection();
1338         FreeUpdateTimer();
1339 }
1340
1341
1342 void BufferView::savePosition()
1343 {
1344         backstack.push(buffer()->fileName(),
1345                        text->cursor.x,
1346                        text->cursor.y);
1347 }
1348
1349
1350 void BufferView::restorePosition()
1351 {
1352         if (backstack.empty()) return;
1353
1354         int  x, y;
1355         string fname = backstack.pop(&x, &y);
1356
1357         beforeChange();
1358         Buffer * b = bufferlist.exists(fname) ?
1359                 bufferlist.getBuffer(fname) :
1360                 bufferlist.loadLyXFile(fname); // don't ask, just load it
1361         buffer(b);
1362         text->SetCursorFromCoordinates(x, y);
1363         update(0);
1364 }
1365
1366
1367 void BufferView::update(signed char f)
1368 {
1369         owner()->updateLayoutChoice();
1370
1371         if (!text->selection && f > -3)
1372                 text->sel_cursor = text->cursor;
1373
1374         FreeUpdateTimer();
1375         text->FullRebreak();
1376
1377         update();
1378
1379         if (f != 3 && f != -3) {
1380                 fitCursor();
1381                 updateScrollbar();
1382         }
1383
1384         if (f == 1 || f == -1) {
1385                 if (buffer()->isLyxClean()) {
1386                         buffer()->markDirty();
1387                         owner()->getMiniBuffer()->setTimer(4);
1388                 } else {
1389                         buffer()->markDirty();
1390                 }
1391         }
1392 }
1393
1394
1395 void BufferView::smallUpdate(signed char f)
1396 {
1397         screen->SmallUpdate();
1398         if (screen->TopCursorVisible()
1399             != screen->first) {
1400                 update(f);
1401                 return;
1402         }
1403
1404         fitCursor();
1405         updateScrollbar();
1406
1407         if (!text->selection)
1408                 text->sel_cursor = text->cursor;
1409
1410         if (f == 1 || f == -1) {
1411                 if (buffer()->isLyxClean()) {
1412                         buffer()->markDirty();
1413                         owner()->getMiniBuffer()->setTimer(4);
1414                 } else {
1415                         buffer()->markDirty();
1416                 }
1417         }
1418 }
1419
1420
1421 void BufferView::setState()
1422 {
1423         if (!lyxrc.rtl_support)
1424                 return;
1425
1426         if (text->real_current_font.isVisibleRightToLeft()) {
1427                 if (owner_->getIntl()->primarykeymap)
1428                         owner_->getIntl()->KeyMapSec();
1429         } else {
1430                 if (!owner_->getIntl()->primarykeymap)
1431                         owner_->getIntl()->KeyMapPrim();
1432         }
1433 }
1434
1435
1436 void BufferView::insetSleep()
1437 {
1438         if (the_locking_inset && !inset_slept) {
1439                 the_locking_inset->GetCursorPos(slx, sly);
1440                 the_locking_inset->InsetUnlock(this);
1441                 inset_slept = true;
1442         }
1443 }
1444
1445
1446 void BufferView::insetWakeup()
1447 {
1448         if (the_locking_inset && inset_slept) {
1449                 the_locking_inset->Edit(this, slx, sly, 0);
1450                 inset_slept = false;
1451         }
1452 }
1453
1454
1455 void BufferView::insetUnlock()
1456 {
1457         if (the_locking_inset) {
1458                 if (!inset_slept) the_locking_inset->InsetUnlock(this);
1459                 the_locking_inset = 0;
1460                 text->FinishUndo();
1461                 inset_slept = false;
1462         }
1463 }
1464
1465
1466 bool BufferView::focus() const
1467 {
1468         return workarea->hasFocus();
1469 }
1470
1471
1472 void BufferView::focus(bool f)
1473 {
1474         if (f) workarea->setFocus();
1475 }
1476
1477
1478 bool BufferView::active() const
1479 {
1480         return workarea->active();
1481 }
1482
1483
1484 Painter & BufferView::getPainter() const
1485 {
1486     return workarea->getPainter();
1487 }
1488
1489
1490 unsigned short BufferView::paperWidth() const
1491 {
1492     return text->paperWidth();
1493 }
1494
1495
1496 bool BufferView::belowMouse() const
1497 {
1498         return workarea->belowMouse();
1499 }
1500
1501
1502 void BufferView::showCursor()
1503 {
1504         if (screen)
1505                 screen->ShowCursor();
1506 }
1507
1508
1509 void BufferView::hideCursor()
1510 {
1511         if (screen)
1512                 screen->HideCursor();
1513 }
1514
1515
1516 void BufferView::toggleSelection(bool b)
1517 {
1518         if (screen)
1519                 screen->ToggleSelection(b);
1520 }
1521
1522
1523 void BufferView::toggleToggle()
1524 {
1525         if (screen)
1526                 screen->ToggleToggle();
1527 }
1528
1529
1530 void BufferView::center()
1531 {
1532         beforeChange();
1533         if (text->cursor.y > workarea->height() / 2) {
1534                 screen->Draw(text->cursor.y - workarea->height() / 2);
1535         } else {
1536                 screen->Draw(0);
1537         }
1538         update(0);
1539         redraw();
1540 }