src/frontends/qt4/GuiWorkArea.cpp

   1 /**
   2  * \file GuiWorkArea.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author John Levon
   7  * \author Abdelrazak Younes
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 #include <config.h>
  13
  14 #include "GuiWorkArea.h"
  15
  16 #include "Buffer.h"
  17 #include "BufferParams.h"
  18 #include "BufferView.h"
  19 #include "CoordCache.h"
  20 #include "Cursor.h"
  21 #include "Font.h"
  22 #include "FuncRequest.h"
  23 #include "GuiApplication.h"
  24 #include "GuiKeySymbol.h"
  25 #include "GuiPainter.h"
  26 #include "GuiPopupMenu.h"
  27 #include "GuiView.h"
  28 #include "KeySymbol.h"
  29 #include "Language.h"
  30 #include "LyXFunc.h"
  31 #include "LyXRC.h"
  32 #include "MetricsInfo.h"
  33 #include "qt_helpers.h"
  34 #include "version.h"
  35
  36 #include "graphics/GraphicsImage.h"
  37 #include "graphics/GraphicsLoader.h"
  38
  39 #include "support/debug.h"
  40 #include "support/gettext.h"
  41 #include "support/FileName.h"
  42
  43 #include "frontends/Application.h"
  44 #include "frontends/FontMetrics.h"
  45 #include "frontends/WorkAreaManager.h"
  46
  47 #include <QContextMenuEvent>
  48 #include <QInputContext>
  49 #include <QHelpEvent>
  50 #include <QMainWindow>
  51 #include <QPainter>
  52 #include <QPalette>
  53 #include <QScrollBar>
  54 #include <QTabBar>
  55 #include <QTimer>
  56 #include <QToolButton>
  57 #include <QToolTip>
  58
  59 #include <boost/bind.hpp>
  60
  61 #ifdef Q_WS_X11
  62 #include <QX11Info>
  63 extern "C" int XEventsQueued(Display *display, int mode);
  64 #endif
  65
  66 #ifdef Q_WS_WIN
  67 int const CursorWidth = 2;
  68 #else
  69 int const CursorWidth = 1;
  70 #endif
  71 int const TabIndicatorWidth = 3;
  72
  73 #undef KeyPress
  74 #undef NoModifier
  75
  76 using namespace std;
  77 using namespace lyx::support;
  78
  79 namespace lyx {
  80
  81
  82 /// return the LyX mouse button state from Qt's
  83 static mouse_button::state q_button_state(Qt::MouseButton button)
  84 {
  85         mouse_button::state b = mouse_button::none;
  86         switch (button) {
  87                 case Qt::LeftButton:
  88                         b = mouse_button::button1;
  89                         break;
  90                 case Qt::MidButton:
  91                         b = mouse_button::button2;
  92                         break;
  93                 case Qt::RightButton:
  94                         b = mouse_button::button3;
  95                         break;
  96                 default:
  97                         break;
  98         }
  99         return b;
 100 }
 101
 102
 103 /// return the LyX mouse button state from Qt's
 104 mouse_button::state q_motion_state(Qt::MouseButtons state)
 105 {
 106         mouse_button::state b = mouse_button::none;
 107         if (state & Qt::LeftButton)
 108                 b |= mouse_button::button1;
 109         if (state & Qt::MidButton)
 110                 b |= mouse_button::button2;
 111         if (state & Qt::RightButton)
 112                 b |= mouse_button::button3;
 113         return b;
 114 }
 115
 116
 117 namespace frontend {
 118
 119 class CursorWidget {
 120 public:
 121         CursorWidget() {}
 122
 123         void draw(QPainter & painter)
 124         {
 125                 if (!show_ || !rect_.isValid())
 126                         return;
 127
 128                 int y = rect_.top();
 129                 int l = x_ - rect_.left();
 130                 int r = rect_.right() - x_;
 131                 int bot = rect_.bottom();
 132
 133                 // draw vertica linel
 134                 painter.fillRect(x_, y, CursorWidth, rect_.height(), color_);
 135
 136                 // draw RTL/LTR indication
 137                 painter.setPen(color_);
 138                 if (l_shape_) {
 139                         if (rtl_)
 140                                 painter.drawLine(x_, bot, x_ - l, bot);
 141                         else
 142                                 painter.drawLine(x_, bot, x_ + CursorWidth + r, bot);
 143                 }
 144
 145                 // draw completion triangle
 146                 if (completable_) {
 147                         int m = y + rect_.height() / 2;
 148                         int d = TabIndicatorWidth - 1;
 149                         if (rtl_) {
 150                                 painter.drawLine(x_ - 1, m - d, x_ - 1 - d, m);
 151                                 painter.drawLine(x_ - 1, m + d, x_ - 1 - d, m);
 152                         } else {
 153                                 painter.drawLine(x_ + CursorWidth, m - d, x_ + CursorWidth + d, m);
 154                                 painter.drawLine(x_ + CursorWidth, m + d, x_ + CursorWidth + d, m);
 155                         }
 156                 }
 157         }
 158
 159         void update(int x, int y, int h, bool l_shape,
 160                 bool rtl, bool completable)
 161         {
 162                 color_ = guiApp->colorCache().get(Color_cursor);
 163                 l_shape_ = l_shape;
 164                 rtl_ = rtl;
 165                 completable_ = completable;
 166                 x_ = x;
 167
 168                 // extension to left and right
 169                 int l = 0;
 170                 int r = 0;
 171
 172                 // RTL/LTR indication
 173                 if (l_shape_) {
 174                         if (rtl)
 175                                 l += h / 3;
 176                         else
 177                                 r += h / 3;
 178                 }
 179
 180                 // completion triangle
 181                 if (completable_) {
 182                         if (rtl)
 183                                 l = max(l, TabIndicatorWidth);
 184                         else
 185                                 r = max(r, TabIndicatorWidth);
 186                 }
 187
 188                 // compute overall rectangle
 189                 rect_ = QRect(x - l, y, CursorWidth + r + l, h);
 190         }
 191
 192         void show(bool set_show = true) { show_ = set_show; }
 193         void hide() { show_ = false; }
 194
 195         QRect const & rect() { return rect_; }
 196
 197 private:
 198         /// cursor is in RTL or LTR text
 199         bool rtl_;
 200         /// indication for RTL or LTR
 201         bool l_shape_;
 202         /// triangle to show that a completion is available
 203         bool completable_;
 204         ///
 205         bool show_;
 206         ///
 207         QColor color_;
 208         /// rectangle, possibly with l_shape and completion triangle
 209         QRect rect_;
 210         /// x position (were the vertical line is drawn)
 211         int x_;
 212 };
 213
 214
 215 // This is a 'heartbeat' generating synthetic mouse move events when the
 216 // cursor is at the top or bottom edge of the viewport. One scroll per 0.2 s
 217 SyntheticMouseEvent::SyntheticMouseEvent()
 218         : timeout(200), restart_timeout(true),
 219           x_old(-1), y_old(-1), scrollbar_value_old(-1.0)
 220 {}
 221
 222
 223
 224 GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & lv)
 225         : buffer_view_(new BufferView(buffer)), lyx_view_(&lv),
 226         cursor_visible_(false),
 227         need_resize_(false), schedule_redraw_(false),
 228         preedit_lines_(1), completer_(this)
 229 {
 230         buffer.workAreaManager().add(this);
 231         // Setup the signals
 232         connect(&cursor_timeout_, SIGNAL(timeout()),
 233                 this, SLOT(toggleCursor()));
 234
 235         int const time = QApplication::cursorFlashTime() / 2;
 236         if (time > 0) {
 237                 cursor_timeout_.setInterval(time);
 238                 cursor_timeout_.start();
 239         } else
 240                 // let's initialize this just to be safe
 241                 cursor_timeout_.setInterval(500);
 242
 243         screen_ = QPixmap(viewport()->width(), viewport()->height());
 244         cursor_ = new frontend::CursorWidget();
 245         cursor_->hide();
 246
 247         setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 248         setAcceptDrops(true);
 249         setMouseTracking(true);
 250         setMinimumSize(100, 70);
 251         updateWindowTitle();
 252
 253         viewport()->setAutoFillBackground(false);
 254         // We don't need double-buffering nor SystemBackground on
 255         // the viewport because we have our own backing pixmap.
 256         viewport()->setAttribute(Qt::WA_NoSystemBackground);
 257
 258         setFocusPolicy(Qt::WheelFocus);
 259
 260         viewport()->setCursor(Qt::IBeamCursor);
 261
 262         synthetic_mouse_event_.timeout.timeout.connect(
 263                 boost::bind(&GuiWorkArea::generateSyntheticMouseEvent,
 264                                         this));
 265
 266         // Initialize the vertical Scroll Bar
 267         QObject::connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
 268                 this, SLOT(scrollTo(int)));
 269
 270         LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
 271                 << "  viewport height: " << viewport()->height());
 272
 273         // Enables input methods for asian languages.
 274         // Must be set when creating custom text editing widgets.
 275         setAttribute(Qt::WA_InputMethodEnabled, true);
 276 }
 277
 278
 279 GuiWorkArea::~GuiWorkArea()
 280 {
 281         buffer_view_->buffer().workAreaManager().remove(this);
 282         delete buffer_view_;
 283         delete cursor_;
 284 }
 285
 286
 287 void GuiWorkArea::close()
 288 {
 289         lyx_view_->removeWorkArea(this);
 290 }
 291
 292
 293 void GuiWorkArea::setFullScreen(bool full_screen)
 294 {
 295         buffer_view_->setFullScreen(full_screen);
 296         if (full_screen) {
 297                 setFrameStyle(QFrame::NoFrame);
 298                 if (lyxrc.full_screen_scrollbar)
 299                         setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
 300         } else {
 301                 setFrameStyle(QFrame::Box);
 302                 setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
 303         }
 304 }
 305
 306
 307 BufferView & GuiWorkArea::bufferView()
 308 {
 309         return *buffer_view_;
 310 }
 311
 312
 313 BufferView const & GuiWorkArea::bufferView() const
 314 {
 315         return *buffer_view_;
 316 }
 317
 318
 319 void GuiWorkArea::stopBlinkingCursor()
 320 {
 321         cursor_timeout_.stop();
 322         hideCursor();
 323 }
 324
 325
 326 void GuiWorkArea::startBlinkingCursor()
 327 {
 328         showCursor();
 329         //we're not supposed to cache this value.
 330         int const time = QApplication::cursorFlashTime() / 2;
 331         if (time <= 0)
 332                 return;
 333         cursor_timeout_.setInterval(time);
 334         cursor_timeout_.start();
 335 }
 336
 337
 338 void GuiWorkArea::redraw()
 339 {
 340         if (!isVisible())
 341                 // No need to redraw in this case.
 342                 return;
 343
 344         // No need to do anything if this is the current view. The BufferView
 345         // metrics are already up to date.
 346         if (lyx_view_ != guiApp->currentView()
 347                 || lyx_view_->currentWorkArea() != this) {
 348                 // FIXME: it would be nice to optimize for the off-screen case.
 349                 buffer_view_->updateMetrics();
 350                 buffer_view_->cursor().fixIfBroken();
 351         }
 352
 353         // update cursor position, because otherwise it has to wait until
 354         // the blinking interval is over
 355         if (cursor_visible_) {
 356                 hideCursor();
 357                 showCursor();
 358         }
 359
 360         LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
 361         updateScreen();
 362         update(0, 0, viewport()->width(), viewport()->height());
 363
 364         /// \warning: scrollbar updating *must* be done after the BufferView is drawn
 365         /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
 366         updateScrollbar();
 367         lyx_view_->updateStatusBar();
 368
 369         if (lyxerr.debugging(Debug::WORKAREA))
 370                 buffer_view_->coordCache().dump();
 371 }
 372
 373
 374 void GuiWorkArea::processKeySym(KeySymbol const & key, KeyModifier mod)
 375 {
 376         // In order to avoid bad surprise in the middle of an operation,
 377         // we better stop the blinking cursor...
 378         // the cursor gets restarted in GuiView::restartCursor()
 379         stopBlinkingCursor();
 380
 381         theLyXFunc().setLyXView(lyx_view_);
 382         theLyXFunc().processKeySym(key, mod);
 383
 384 }
 385
 386
 387 void GuiWorkArea::dispatch(FuncRequest const & cmd0, KeyModifier mod)
 388 {
 389         // Handle drag&drop
 390         if (cmd0.action == LFUN_FILE_OPEN) {
 391                 lyx_view_->dispatch(cmd0);
 392                 return;
 393         }
 394
 395         theLyXFunc().setLyXView(lyx_view_);
 396
 397         FuncRequest cmd;
 398
 399         if (cmd0.action == LFUN_MOUSE_PRESS) {
 400                 if (mod == ShiftModifier)
 401                         cmd = FuncRequest(cmd0, "region-select");
 402                 else if (mod == ControlModifier)
 403                         cmd = FuncRequest(cmd0, "paragraph-select");
 404                 else
 405                         cmd = cmd0;
 406         }
 407         else
 408                 cmd = cmd0;
 409
 410         bool const notJustMovingTheMouse =
 411                 cmd.action != LFUN_MOUSE_MOTION || cmd.button() != mouse_button::none;
 412
 413         // In order to avoid bad surprise in the middle of an operation, we better stop
 414         // the blinking cursor.
 415         if (notJustMovingTheMouse)
 416                 stopBlinkingCursor();
 417
 418         buffer_view_->mouseEventDispatch(cmd);
 419
 420         // Skip these when selecting
 421         if (cmd.action != LFUN_MOUSE_MOTION) {
 422                 completer_.updateVisibility(false, false);
 423                 lyx_view_->updateLayoutList();
 424                 lyx_view_->updateToolbars();
 425         }
 426
 427         // GUI tweaks except with mouse motion with no button pressed.
 428         if (notJustMovingTheMouse) {
 429                 // Slight hack: this is only called currently when we
 430                 // clicked somewhere, so we force through the display
 431                 // of the new status here.
 432                 lyx_view_->clearMessage();
 433
 434                 // Show the cursor immediately after any operation
 435                 startBlinkingCursor();
 436         }
 437 }
 438
 439
 440 void GuiWorkArea::resizeBufferView()
 441 {
 442         // WARNING: Please don't put any code that will trigger a repaint here!
 443         // We are already inside a paint event.
 444         lyx_view_->setBusy(true);
 445         buffer_view_->resize(viewport()->width(), viewport()->height());
 446         updateScreen();
 447
 448         // Update scrollbars which might have changed due different
 449         // BufferView dimension. This is especially important when the
 450         // BufferView goes from zero-size to the real-size for the first time,
 451         // as the scrollbar paramters are then set for the first time.
 452         updateScrollbar();
 453
 454         lyx_view_->updateLayoutList();
 455         lyx_view_->setBusy(false);
 456         need_resize_ = false;
 457 }
 458
 459
 460 void GuiWorkArea::showCursor()
 461 {
 462         if (cursor_visible_)
 463                 return;
 464
 465         // RTL or not RTL
 466         bool l_shape = false;
 467         Font const & realfont = buffer_view_->cursor().real_current_font;
 468         BufferParams const & bp = buffer_view_->buffer().params();
 469         bool const samelang = realfont.language() == bp.language;
 470         bool const isrtl = realfont.isVisibleRightToLeft();
 471
 472         if (!samelang || isrtl != bp.language->rightToLeft())
 473                 l_shape = true;
 474
 475         // The ERT language hack needs fixing up
 476         if (realfont.language() == latex_language)
 477                 l_shape = false;
 478
 479         Font const font = buffer_view_->cursor().getFont();
 480         FontMetrics const & fm = theFontMetrics(font);
 481         int const asc = fm.maxAscent();
 482         int const des = fm.maxDescent();
 483         int h = asc + des;
 484         int x = 0;
 485         int y = 0;
 486         Cursor & cur = buffer_view_->cursor();
 487         cur.getPos(x, y);
 488         y -= asc;
 489
 490         // if it doesn't touch the screen, don't try to show it
 491         bool cursorInView = true;
 492         if (y + h < 0 || y >= viewport()->height())
 493                 cursorInView = false;
 494
 495         // show cursor on screen
 496         bool completable = completer_.completionAvailable()
 497                 && !completer_.popupVisible()
 498                 && !completer_.inlineVisible();
 499         if (cursorInView) {
 500                 cursor_visible_ = true;
 501                 showCursor(x, y, h, l_shape, isrtl, completable);
 502         }
 503 }
 504
 505
 506 void GuiWorkArea::hideCursor()
 507 {
 508         if (!cursor_visible_)
 509                 return;
 510
 511         cursor_visible_ = false;
 512         removeCursor();
 513 }
 514
 515
 516 void GuiWorkArea::toggleCursor()
 517 {
 518         if (cursor_visible_)
 519                 hideCursor();
 520         else
 521                 showCursor();
 522 }
 523
 524
 525 void GuiWorkArea::updateScrollbar()
 526 {
 527         ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
 528
 529         verticalScrollBar()->setRange(scroll_.min, scroll_.max);
 530         verticalScrollBar()->setPageStep(scroll_.page_step);
 531         verticalScrollBar()->setSingleStep(scroll_.single_step);
 532         // Block the scrollbar signal to prevent recursive signal/slot calling.
 533         verticalScrollBar()->blockSignals(true);
 534         verticalScrollBar()->setValue(scroll_.position);
 535         verticalScrollBar()->setSliderPosition(scroll_.position);
 536         verticalScrollBar()->blockSignals(false);
 537 }
 538
 539
 540 void GuiWorkArea::scrollTo(int value)
 541 {
 542         stopBlinkingCursor();
 543         buffer_view_->scrollDocView(value);
 544
 545         if (lyxrc.cursor_follows_scrollbar) {
 546                 buffer_view_->setCursorFromScrollbar();
 547                 lyx_view_->updateLayoutList();
 548         }
 549         // Show the cursor immediately after any operation.
 550         startBlinkingCursor();
 551         QApplication::syncX();
 552 }
 553
 554
 555 bool GuiWorkArea::event(QEvent * e)
 556 {
 557         switch (e->type()) {
 558         case QEvent::ToolTip: {
 559                 QHelpEvent * helpEvent = static_cast<QHelpEvent *>(e);
 560                 if (lyxrc.use_tooltip) {
 561                         QPoint pos = helpEvent->pos();
 562                         if (pos.x() < viewport()->width()) {
 563                                 QString s = toqstr(buffer_view_->toolTip(pos.x(), pos.y()));
 564                                 QToolTip::showText(helpEvent->globalPos(), s);
 565                         }
 566                         else
 567                                 QToolTip::hideText();
 568                 }
 569                 // Don't forget to accept the event!
 570                 e->accept();
 571                 return true;
 572         }
 573
 574         case QEvent::ShortcutOverride: {
 575                 // We catch this event in order to catch the Tab or Shift+Tab key press
 576                 // which are otherwise reserved to focus switching between controls
 577                 // within a dialog.
 578                 QKeyEvent * ke = static_cast<QKeyEvent*>(e);
 579                 if ((ke->key() != Qt::Key_Tab && ke->key() != Qt::Key_Backtab)
 580                         || ke->modifiers() & Qt::ControlModifier)
 581                         return QAbstractScrollArea::event(e);
 582                 keyPressEvent(ke);
 583                 return true;
 584         }
 585
 586         default:
 587                 return QAbstractScrollArea::event(e);
 588         }
 589         return false;
 590 }
 591
 592
 593 void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
 594 {
 595         QPoint pos = e->pos();
 596         docstring name = buffer_view_->contextMenu(pos.x(), pos.y());
 597         if (name.empty()) {
 598                 QAbstractScrollArea::contextMenuEvent(e);
 599                 return;
 600         }
 601         QMenu * menu = guiApp->menus().menu(toqstr(name));
 602         if (!menu) {
 603                 QAbstractScrollArea::contextMenuEvent(e);
 604                 return;
 605         }
 606         // Position the menu to the right.
 607         // FIXME: menu position should be different for RTL text.
 608         menu->exec(e->globalPos());
 609         e->accept();
 610 }
 611
 612
 613 void GuiWorkArea::focusInEvent(QFocusEvent * e)
 614 {
 615         if (lyx_view_->currentWorkArea() != this)
 616                 lyx_view_->setCurrentWorkArea(this);
 617
 618         // Repaint the whole screen.
 619         // Note: this is different from redraw() as only the backing pixmap
 620         // will be redrawn, which is cheap.
 621         viewport()->repaint();
 622
 623         startBlinkingCursor();
 624         QAbstractScrollArea::focusInEvent(e);
 625 }
 626
 627
 628 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 629 {
 630         stopBlinkingCursor();
 631         QAbstractScrollArea::focusOutEvent(e);
 632 }
 633
 634
 635 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 636 {
 637         if (dc_event_.active && dc_event_ == *e) {
 638                 dc_event_.active = false;
 639                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 640                         q_button_state(e->button()));
 641                 dispatch(cmd);
 642                 e->accept();
 643                 return;
 644         }
 645
 646         inputContext()->reset();
 647
 648         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 649                 q_button_state(e->button()));
 650         dispatch(cmd, q_key_state(e->modifiers()));
 651         e->accept();
 652 }
 653
 654
 655 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 656 {
 657         if (synthetic_mouse_event_.timeout.running())
 658                 synthetic_mouse_event_.timeout.stop();
 659
 660         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 661                               q_button_state(e->button()));
 662         dispatch(cmd);
 663         e->accept();
 664 }
 665
 666
 667 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 668 {
 669         // we kill the triple click if we move
 670         doubleClickTimeout();
 671         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 672                 q_motion_state(e->buttons()));
 673
 674         e->accept();
 675
 676         // If we're above or below the work area...
 677         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 678                 // Make sure only a synthetic event can cause a page scroll,
 679                 // so they come at a steady rate:
 680                 if (e->y() <= 20)
 681                         // _Force_ a scroll up:
 682                         cmd.y = -40;
 683                 else
 684                         cmd.y = viewport()->height();
 685                 // Store the event, to be handled when the timeout expires.
 686                 synthetic_mouse_event_.cmd = cmd;
 687
 688                 if (synthetic_mouse_event_.timeout.running())
 689                         // Discard the event. Note that it _may_ be handled
 690                         // when the timeout expires if
 691                         // synthetic_mouse_event_.cmd has not been overwritten.
 692                         // Ie, when the timeout expires, we handle the
 693                         // most recent event but discard all others that
 694                         // occurred after the one used to start the timeout
 695                         // in the first place.
 696                         return;
 697
 698                 synthetic_mouse_event_.restart_timeout = true;
 699                 synthetic_mouse_event_.timeout.start();
 700                 // Fall through to handle this event...
 701
 702         } else if (synthetic_mouse_event_.timeout.running()) {
 703                 // Store the event, to be possibly handled when the timeout
 704                 // expires.
 705                 // Once the timeout has expired, normal control is returned
 706                 // to mouseMoveEvent (restart_timeout = false).
 707                 // This results in a much smoother 'feel' when moving the
 708                 // mouse back into the work area.
 709                 synthetic_mouse_event_.cmd = cmd;
 710                 synthetic_mouse_event_.restart_timeout = false;
 711                 return;
 712         }
 713
 714         // Has anything changed on-screen since the last QMouseEvent
 715         // was received?
 716         double const scrollbar_value = verticalScrollBar()->value();
 717         if (e->x() == synthetic_mouse_event_.x_old
 718                 && e->y() == synthetic_mouse_event_.y_old
 719                 && scrollbar_value == synthetic_mouse_event_.scrollbar_value_old) {
 720                 // Nothing changed on-screen since the last QMouseEvent.
 721                 return;
 722         }
 723
 724         // Yes something has changed. Store the params used to check this.
 725         synthetic_mouse_event_.x_old = e->x();
 726         synthetic_mouse_event_.y_old = e->y();
 727         synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 728
 729         // ... and dispatch the event to the LyX core.
 730         dispatch(cmd);
 731 }
 732
 733
 734 void GuiWorkArea::wheelEvent(QWheelEvent * e)
 735 {
 736         // Wheel rotation by one notch results in a delta() of 120 (see
 737         // documentation of QWheelEvent)
 738         double const lines = qApp->wheelScrollLines()
 739                 * lyxrc.mouse_wheel_speed
 740                 * e->delta() / 120.0;
 741         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << qApp->wheelScrollLines()
 742                 << " delta = " << e->delta()
 743                 << " lines = " << lines);
 744         verticalScrollBar()->setValue(verticalScrollBar()->value() -
 745                 int(lines *  verticalScrollBar()->singleStep()));
 746         e->accept();
 747 }
 748
 749
 750 void GuiWorkArea::generateSyntheticMouseEvent()
 751 {
 752         // Set things off to generate the _next_ 'pseudo' event.
 753         if (synthetic_mouse_event_.restart_timeout)
 754                 synthetic_mouse_event_.timeout.start();
 755
 756         // Has anything changed on-screen since the last timeout signal
 757         // was received?
 758         double const scrollbar_value = verticalScrollBar()->value();
 759         if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 760                 // Yes it has. Store the params used to check this.
 761                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 762
 763                 // ... and dispatch the event to the LyX core.
 764                 dispatch(synthetic_mouse_event_.cmd);
 765         }
 766 }
 767
 768
 769 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 770 {
 771         // intercept some keys if completion popup is visible
 772         if (completer_.popupVisible()) {
 773                 switch (ev->key()) {
 774                 case Qt::Key_Enter:
 775                 case Qt::Key_Return:
 776                         completer_.activate();
 777                         ev->accept();
 778                         return;
 779                 }
 780         }
 781
 782         // intercept keys for the completion
 783         if (ev->key() == Qt::Key_Tab) {
 784                 completer_.tab();
 785                 ev->accept();
 786                 return;
 787         }
 788
 789         if (completer_.popupVisible() && ev->key() == Qt::Key_Escape) {
 790                 completer_.hidePopup();
 791                 ev->accept();
 792                 return;
 793         }
 794
 795         if (completer_.inlineVisible() && ev->key() == Qt::Key_Escape) {
 796                 completer_.hideInline();
 797                 ev->accept();
 798                 return;
 799         }
 800
 801         // do nothing if there are other events
 802         // (the auto repeated events come too fast)
 803         // \todo FIXME: remove hard coded Qt keys, process the key binding
 804 #ifdef Q_WS_X11
 805         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 806                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 807                 LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
 808                 ev->ignore();
 809                 return;
 810         }
 811 #endif
 812
 813         LYXERR(Debug::KEY, " count: " << ev->count()
 814                 << " text: " << fromqstr(ev->text())
 815                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key());
 816
 817         KeySymbol sym;
 818         setKeySymbol(&sym, ev);
 819         processKeySym(sym, q_key_state(ev->modifiers()));
 820         ev->accept();
 821 }
 822
 823
 824 void GuiWorkArea::doubleClickTimeout()
 825 {
 826         dc_event_.active = false;
 827 }
 828
 829
 830 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 831 {
 832         dc_event_ = DoubleClick(ev);
 833         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 834                            SLOT(doubleClickTimeout()));
 835         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 836                         ev->x(), ev->y(),
 837                         q_button_state(ev->button()));
 838         dispatch(cmd);
 839         ev->accept();
 840 }
 841
 842
 843 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 844 {
 845         QAbstractScrollArea::resizeEvent(ev);
 846         need_resize_ = true;
 847         ev->accept();
 848 }
 849
 850
 851 void GuiWorkArea::update(int x, int y, int w, int h)
 852 {
 853         viewport()->repaint(x, y, w, h);
 854 }
 855
 856
 857 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 858 {
 859         QRect const rc = ev->rect();
 860         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
 861         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
 862
 863         if (need_resize_) {
 864                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 865                 resizeBufferView();
 866                 hideCursor();
 867                 showCursor();
 868         }
 869
 870         QPainter pain(viewport());
 871         pain.drawPixmap(rc, screen_, rc);
 872         cursor_->draw(pain);
 873         ev->accept();
 874 }
 875
 876
 877 void GuiWorkArea::updateScreen()
 878 {
 879         GuiPainter pain(&screen_);
 880         buffer_view_->draw(pain);
 881 }
 882
 883
 884 void GuiWorkArea::showCursor(int x, int y, int h,
 885         bool l_shape, bool rtl, bool completable)
 886 {
 887         if (schedule_redraw_) {
 888                 buffer_view_->updateMetrics();
 889                 updateScreen();
 890                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
 891                 schedule_redraw_ = false;
 892                 // Show the cursor immediately after the update.
 893                 hideCursor();
 894                 toggleCursor();
 895                 return;
 896         }
 897
 898         cursor_->update(x, y, h, l_shape, rtl, completable);
 899         cursor_->show();
 900         viewport()->update(cursor_->rect());
 901 }
 902
 903
 904 void GuiWorkArea::removeCursor()
 905 {
 906         cursor_->hide();
 907         //if (!qApp->focusWidget())
 908                 viewport()->update(cursor_->rect());
 909 }
 910
 911
 912 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
 913 {
 914         QString const & commit_string = e->commitString();
 915         docstring const & preedit_string
 916                 = qstring_to_ucs4(e->preeditString());
 917
 918         if (!commit_string.isEmpty()) {
 919
 920                 LYXERR(Debug::KEY, "preeditString: " << fromqstr(e->preeditString())
 921                         << " commitString: " << fromqstr(e->commitString()));
 922
 923                 int key = 0;
 924
 925                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
 926                 for (int i = 0; i != commit_string.size(); ++i) {
 927                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
 928                         keyPressEvent(&ev);
 929                 }
 930         }
 931
 932         // Hide the cursor during the kana-kanji transformation.
 933         if (preedit_string.empty())
 934                 startBlinkingCursor();
 935         else
 936                 stopBlinkingCursor();
 937
 938         // last_width : for checking if last preedit string was/wasn't empty.
 939         static bool last_width = false;
 940         if (!last_width && preedit_string.empty()) {
 941                 // if last_width is last length of preedit string.
 942                 e->accept();
 943                 return;
 944         }
 945
 946         GuiPainter pain(&screen_);
 947         buffer_view_->updateMetrics();
 948         buffer_view_->draw(pain);
 949         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
 950         FontMetrics const & fm = theFontMetrics(font);
 951         int height = fm.maxHeight();
 952         int cur_x = cursor_->rect().left();
 953         int cur_y = cursor_->rect().bottom();
 954
 955         // redraw area of preedit string.
 956         update(0, cur_y - height, viewport()->width(),
 957                 (height + 1) * preedit_lines_);
 958
 959         if (preedit_string.empty()) {
 960                 last_width = false;
 961                 preedit_lines_ = 1;
 962                 e->accept();
 963                 return;
 964         }
 965         last_width = true;
 966
 967         // att : stores an IM attribute.
 968         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
 969
 970         // get attributes of input method cursor.
 971         // cursor_pos : cursor position in preedit string.
 972         size_t cursor_pos = 0;
 973         bool cursor_is_visible = false;
 974         for (int i = 0; i != att.size(); ++i) {
 975                 if (att.at(i).type == QInputMethodEvent::Cursor) {
 976                         cursor_pos = att.at(i).start;
 977                         cursor_is_visible = att.at(i).length != 0;
 978                         break;
 979                 }
 980         }
 981
 982         size_t preedit_length = preedit_string.length();
 983
 984         // get position of selection in input method.
 985         // FIXME: isn't there a way to do this simplier?
 986         // rStart : cursor position in selected string in IM.
 987         size_t rStart = 0;
 988         // rLength : selected string length in IM.
 989         size_t rLength = 0;
 990         if (cursor_pos < preedit_length) {
 991                 for (int i = 0; i != att.size(); ++i) {
 992                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
 993                                 if (att.at(i).start <= int(cursor_pos)
 994                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
 995                                                 rStart = att.at(i).start;
 996                                                 rLength = att.at(i).length;
 997                                                 if (!cursor_is_visible)
 998                                                         cursor_pos += rLength;
 999                                                 break;
1000                                 }
1001                         }
1002                 }
1003         }
1004         else {
1005                 rStart = cursor_pos;
1006                 rLength = 0;
1007         }
1008
1009         int const right_margin = buffer_view_->rightMargin();
1010         Painter::preedit_style ps;
1011         // Most often there would be only one line:
1012         preedit_lines_ = 1;
1013         for (size_t pos = 0; pos != preedit_length; ++pos) {
1014                 char_type const typed_char = preedit_string[pos];
1015                 // reset preedit string style
1016                 ps = Painter::preedit_default;
1017
1018                 // if we reached the right extremity of the screen, go to next line.
1019                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
1020                         cur_x = right_margin;
1021                         cur_y += height + 1;
1022                         ++preedit_lines_;
1023                 }
1024                 // preedit strings are displayed with dashed underline
1025                 // and partial strings are displayed white on black indicating
1026                 // that we are in selecting mode in the input method.
1027                 // FIXME: rLength == preedit_length is not a changing condition
1028                 // FIXME: should be put out of the loop.
1029                 if (pos >= rStart
1030                         && pos < rStart + rLength
1031                         && !(cursor_pos < rLength && rLength == preedit_length))
1032                         ps = Painter::preedit_selecting;
1033
1034                 if (pos == cursor_pos
1035                         && (cursor_pos < rLength && rLength == preedit_length))
1036                         ps = Painter::preedit_cursor;
1037
1038                 // draw one character and update cur_x.
1039                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1040         }
1041
1042         // update the preedit string screen area.
1043         update(0, cur_y - preedit_lines_*height, viewport()->width(),
1044                 (height + 1) * preedit_lines_);
1045
1046         // Don't forget to accept the event!
1047         e->accept();
1048 }
1049
1050
1051 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1052 {
1053         QRect cur_r(0,0,0,0);
1054         switch (query) {
1055                 // this is the CJK-specific composition window position.
1056                 case Qt::ImMicroFocus:
1057                         cur_r = cursor_->rect();
1058                         if (preedit_lines_ != 1)
1059                                 cur_r.moveLeft(10);
1060                         cur_r.moveBottom(cur_r.bottom() + cur_r.height() * preedit_lines_);
1061                         // return lower right of cursor in LyX.
1062                         return cur_r;
1063                 default:
1064                         return QWidget::inputMethodQuery(query);
1065         }
1066 }
1067
1068
1069 void GuiWorkArea::updateWindowTitle()
1070 {
1071         docstring maximize_title;
1072         docstring minimize_title;
1073
1074         Buffer & buf = buffer_view_->buffer();
1075         FileName const fileName = buf.fileName();
1076         if (!fileName.empty()) {
1077                 maximize_title = fileName.displayName(30);
1078                 minimize_title = from_utf8(fileName.onlyFileName());
1079                 if (!buf.isClean()) {
1080                         maximize_title += _(" (changed)");
1081                         minimize_title += char_type('*');
1082                 }
1083                 if (buf.isReadonly())
1084                         maximize_title += _(" (read only)");
1085         }
1086
1087         QString title = windowTitle();
1088         QString new_title = toqstr(maximize_title);
1089         if (title == new_title)
1090                 return;
1091
1092         QWidget::setWindowTitle(new_title);
1093         QWidget::setWindowIconText(toqstr(minimize_title));
1094         titleChanged(this);
1095 }
1096
1097
1098 void GuiWorkArea::setReadOnly(bool)
1099 {
1100         updateWindowTitle();
1101         if (this == lyx_view_->currentWorkArea())
1102                 lyx_view_->updateBufferDependent(false);
1103 }
1104
1105
1106 bool GuiWorkArea::isFullScreen()
1107 {
1108         return lyx_view_ && lyx_view_->isFullScreen();
1109 }
1110
1111
1112 ////////////////////////////////////////////////////////////////////
1113 //
1114 // TabWorkArea
1115 //
1116 ////////////////////////////////////////////////////////////////////
1117
1118 TabWorkArea::TabWorkArea(QWidget * parent) : QTabWidget(parent)
1119 {
1120         QPalette pal = palette();
1121         pal.setColor(QPalette::Active, QPalette::Button,
1122                 pal.color(QPalette::Active, QPalette::Window));
1123         pal.setColor(QPalette::Disabled, QPalette::Button,
1124                 pal.color(QPalette::Disabled, QPalette::Window));
1125         pal.setColor(QPalette::Inactive, QPalette::Button,
1126                 pal.color(QPalette::Inactive, QPalette::Window));
1127
1128         QObject::connect(this, SIGNAL(currentChanged(int)),
1129                 this, SLOT(on_currentTabChanged(int)));
1130
1131         QToolButton * closeBufferButton = new QToolButton(this);
1132     closeBufferButton->setPalette(pal);
1133         // FIXME: rename the icon to closebuffer.png
1134         closeBufferButton->setIcon(QIcon(":/images/closetab.png"));
1135         closeBufferButton->setText("Close File");
1136         closeBufferButton->setAutoRaise(true);
1137         closeBufferButton->setCursor(Qt::ArrowCursor);
1138         closeBufferButton->setToolTip(qt_("Close File"));
1139         closeBufferButton->setEnabled(true);
1140         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1141                 this, SLOT(closeCurrentBuffer()));
1142         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1143
1144         QToolButton * closeTabButton = new QToolButton(this);
1145     closeTabButton->setPalette(pal);
1146         closeTabButton->setIcon(QIcon(":/images/hidetab.png"));
1147         closeTabButton->setText("Hide tab");
1148         closeTabButton->setAutoRaise(true);
1149         closeTabButton->setCursor(Qt::ArrowCursor);
1150         closeTabButton->setToolTip(qt_("Hide tab"));
1151         closeTabButton->setEnabled(true);
1152         QObject::connect(closeTabButton, SIGNAL(clicked()),
1153                 this, SLOT(closeCurrentTab()));
1154         setCornerWidget(closeTabButton, Qt::TopLeftCorner);
1155
1156         setUsesScrollButtons(true);
1157 }
1158
1159
1160 void TabWorkArea::setFullScreen(bool full_screen)
1161 {
1162         for (int i = 0; i != count(); ++i) {
1163                 if (GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i)))
1164                         wa->setFullScreen(full_screen);
1165         }
1166
1167         if (lyxrc.full_screen_tabbar)
1168                 showBar(!full_screen && count()>1);
1169 }
1170
1171
1172 void TabWorkArea::showBar(bool show)
1173 {
1174         tabBar()->setEnabled(show);
1175         tabBar()->setVisible(show);
1176 }
1177
1178
1179 GuiWorkArea * TabWorkArea::currentWorkArea()
1180 {
1181         if (count() == 0)
1182                 return 0;
1183
1184         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1185         BOOST_ASSERT(wa);
1186         return wa;
1187 }
1188
1189
1190 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1191 {
1192         for (int i = 0; i != count(); ++i) {
1193                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1194                 BOOST_ASSERT(wa);
1195                 if (&wa->bufferView().buffer() == &buffer)
1196                         return wa;
1197         }
1198         return 0;
1199 }
1200
1201
1202 void TabWorkArea::closeAll()
1203 {
1204         while (count()) {
1205                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1206                 BOOST_ASSERT(wa);
1207                 removeTab(0);
1208                 delete wa;
1209         }
1210 }
1211
1212
1213 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1214 {
1215         BOOST_ASSERT(work_area);
1216         int index = indexOf(work_area);
1217         if (index == -1)
1218                 return false;
1219
1220         if (index == currentIndex())
1221                 // Make sure the work area is up to date.
1222                 on_currentTabChanged(index);
1223         else
1224                 // Switch to the work area.
1225                 setCurrentIndex(index);
1226         work_area->setFocus();
1227
1228         return true;
1229 }
1230
1231
1232 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1233 {
1234         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1235         wa->setUpdatesEnabled(false);
1236         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1237         // when hiding it again below).
1238         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1239                 showBar(count() > 0);
1240         addTab(wa, wa->windowTitle());
1241         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1242                 this, SLOT(updateTabText(GuiWorkArea *)));
1243         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1244                 setFullScreen(true);
1245         else
1246                 // Hide tabbar if there's only one tab.
1247                 showBar(count() > 1);
1248
1249         return wa;
1250 }
1251
1252
1253 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1254 {
1255         BOOST_ASSERT(work_area);
1256         int index = indexOf(work_area);
1257         if (index == -1)
1258                 return false;
1259
1260         work_area->setUpdatesEnabled(false);
1261         removeTab(index);
1262         delete work_area;
1263
1264         if (count()) {
1265                 // make sure the next work area is enabled.
1266                 currentWidget()->setUpdatesEnabled(true);
1267                 if ((currentWorkArea() && currentWorkArea()->isFullScreen()))
1268                         setFullScreen(true);
1269                 else
1270                         // Hide tabbar if there's only one tab.
1271                         showBar(count() > 1);
1272         }
1273         return true;
1274 }
1275
1276
1277 void TabWorkArea::on_currentTabChanged(int i)
1278 {
1279         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1280         BOOST_ASSERT(wa);
1281         BufferView & bv = wa->bufferView();
1282         bv.cursor().fixIfBroken();
1283         bv.updateMetrics();
1284         wa->setUpdatesEnabled(true);
1285         wa->redraw();
1286         wa->setFocus();
1287         ///
1288         currentWorkAreaChanged(wa);
1289
1290         LYXERR(Debug::GUI, "currentTabChanged " << i
1291                 << "File" << bv.buffer().absFileName());
1292 }
1293
1294
1295 void TabWorkArea::closeCurrentBuffer()
1296 {
1297         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
1298 }
1299
1300
1301 void TabWorkArea::closeCurrentTab()
1302 {
1303         removeWorkArea(currentWorkArea());
1304 }
1305
1306
1307 void TabWorkArea::updateTabText(GuiWorkArea * wa)
1308 {
1309         int const i = indexOf(wa);
1310         if (i < 0)
1311                 return;
1312         setTabText(i, wa->windowTitle());
1313 }
1314
1315 } // namespace frontend
1316 } // namespace lyx
1317
1318 #include "GuiWorkArea_moc.cpp"