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         lyx_view_->setCurrentWorkArea(this);
 616         // Repaint the whole screen.
 617         // Note: this is different from redraw() as only the backing pixmap
 618         // will be redrawn, which is cheap.
 619         viewport()->repaint();
 620
 621         startBlinkingCursor();
 622         QAbstractScrollArea::focusInEvent(e);
 623 }
 624
 625
 626 void GuiWorkArea::focusOutEvent(QFocusEvent * e)
 627 {
 628         stopBlinkingCursor();
 629         QAbstractScrollArea::focusOutEvent(e);
 630 }
 631
 632
 633 void GuiWorkArea::mousePressEvent(QMouseEvent * e)
 634 {
 635         if (dc_event_.active && dc_event_ == *e) {
 636                 dc_event_.active = false;
 637                 FuncRequest cmd(LFUN_MOUSE_TRIPLE, e->x(), e->y(),
 638                         q_button_state(e->button()));
 639                 dispatch(cmd);
 640                 e->accept();
 641                 return;
 642         }
 643
 644         inputContext()->reset();
 645
 646         FuncRequest const cmd(LFUN_MOUSE_PRESS, e->x(), e->y(),
 647                 q_button_state(e->button()));
 648         dispatch(cmd, q_key_state(e->modifiers()));
 649         e->accept();
 650 }
 651
 652
 653 void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
 654 {
 655         if (synthetic_mouse_event_.timeout.running())
 656                 synthetic_mouse_event_.timeout.stop();
 657
 658         FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
 659                               q_button_state(e->button()));
 660         dispatch(cmd);
 661         e->accept();
 662 }
 663
 664
 665 void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
 666 {
 667         // we kill the triple click if we move
 668         doubleClickTimeout();
 669         FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),
 670                 q_motion_state(e->buttons()));
 671
 672         e->accept();
 673
 674         // If we're above or below the work area...
 675         if (e->y() <= 20 || e->y() >= viewport()->height() - 20) {
 676                 // Make sure only a synthetic event can cause a page scroll,
 677                 // so they come at a steady rate:
 678                 if (e->y() <= 20)
 679                         // _Force_ a scroll up:
 680                         cmd.y = -40;
 681                 else
 682                         cmd.y = viewport()->height();
 683                 // Store the event, to be handled when the timeout expires.
 684                 synthetic_mouse_event_.cmd = cmd;
 685
 686                 if (synthetic_mouse_event_.timeout.running())
 687                         // Discard the event. Note that it _may_ be handled
 688                         // when the timeout expires if
 689                         // synthetic_mouse_event_.cmd has not been overwritten.
 690                         // Ie, when the timeout expires, we handle the
 691                         // most recent event but discard all others that
 692                         // occurred after the one used to start the timeout
 693                         // in the first place.
 694                         return;
 695
 696                 synthetic_mouse_event_.restart_timeout = true;
 697                 synthetic_mouse_event_.timeout.start();
 698                 // Fall through to handle this event...
 699
 700         } else if (synthetic_mouse_event_.timeout.running()) {
 701                 // Store the event, to be possibly handled when the timeout
 702                 // expires.
 703                 // Once the timeout has expired, normal control is returned
 704                 // to mouseMoveEvent (restart_timeout = false).
 705                 // This results in a much smoother 'feel' when moving the
 706                 // mouse back into the work area.
 707                 synthetic_mouse_event_.cmd = cmd;
 708                 synthetic_mouse_event_.restart_timeout = false;
 709                 return;
 710         }
 711
 712         // Has anything changed on-screen since the last QMouseEvent
 713         // was received?
 714         double const scrollbar_value = verticalScrollBar()->value();
 715         if (e->x() == synthetic_mouse_event_.x_old
 716                 && e->y() == synthetic_mouse_event_.y_old
 717                 && scrollbar_value == synthetic_mouse_event_.scrollbar_value_old) {
 718                 // Nothing changed on-screen since the last QMouseEvent.
 719                 return;
 720         }
 721
 722         // Yes something has changed. Store the params used to check this.
 723         synthetic_mouse_event_.x_old = e->x();
 724         synthetic_mouse_event_.y_old = e->y();
 725         synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 726
 727         // ... and dispatch the event to the LyX core.
 728         dispatch(cmd);
 729 }
 730
 731
 732 void GuiWorkArea::wheelEvent(QWheelEvent * e)
 733 {
 734         // Wheel rotation by one notch results in a delta() of 120 (see
 735         // documentation of QWheelEvent)
 736         double const lines = qApp->wheelScrollLines()
 737                 * lyxrc.mouse_wheel_speed
 738                 * e->delta() / 120.0;
 739         LYXERR(Debug::SCROLLING, "wheelScrollLines = " << qApp->wheelScrollLines()
 740                 << " delta = " << e->delta()
 741                 << " lines = " << lines);
 742         verticalScrollBar()->setValue(verticalScrollBar()->value() -
 743                 int(lines *  verticalScrollBar()->singleStep()));
 744         e->accept();
 745 }
 746
 747
 748 void GuiWorkArea::generateSyntheticMouseEvent()
 749 {
 750         // Set things off to generate the _next_ 'pseudo' event.
 751         if (synthetic_mouse_event_.restart_timeout)
 752                 synthetic_mouse_event_.timeout.start();
 753
 754         // Has anything changed on-screen since the last timeout signal
 755         // was received?
 756         double const scrollbar_value = verticalScrollBar()->value();
 757         if (scrollbar_value != synthetic_mouse_event_.scrollbar_value_old) {
 758                 // Yes it has. Store the params used to check this.
 759                 synthetic_mouse_event_.scrollbar_value_old = scrollbar_value;
 760
 761                 // ... and dispatch the event to the LyX core.
 762                 dispatch(synthetic_mouse_event_.cmd);
 763         }
 764 }
 765
 766
 767 void GuiWorkArea::keyPressEvent(QKeyEvent * ev)
 768 {
 769         // intercept some keys if completion popup is visible
 770         if (completer_.popupVisible()) {
 771                 switch (ev->key()) {
 772                 case Qt::Key_Enter:
 773                 case Qt::Key_Return:
 774                         completer_.activate();
 775                         ev->accept();
 776                         return;
 777                 }
 778         }
 779
 780         // intercept keys for the completion
 781         if (ev->key() == Qt::Key_Tab) {
 782                 completer_.tab();
 783                 ev->accept();
 784                 return;
 785         }
 786
 787         if (completer_.popupVisible() && ev->key() == Qt::Key_Escape) {
 788                 completer_.hidePopup();
 789                 ev->accept();
 790                 return;
 791         }
 792
 793         if (completer_.inlineVisible() && ev->key() == Qt::Key_Escape) {
 794                 completer_.hideInline();
 795                 ev->accept();
 796                 return;
 797         }
 798
 799         // do nothing if there are other events
 800         // (the auto repeated events come too fast)
 801         // \todo FIXME: remove hard coded Qt keys, process the key binding
 802 #ifdef Q_WS_X11
 803         if (XEventsQueued(QX11Info::display(), 0) > 1 && ev->isAutoRepeat()
 804                         && (Qt::Key_PageDown || Qt::Key_PageUp)) {
 805                 LYXERR(Debug::KEY, "system is busy: scroll key event ignored");
 806                 ev->ignore();
 807                 return;
 808         }
 809 #endif
 810
 811         LYXERR(Debug::KEY, " count: " << ev->count()
 812                 << " text: " << fromqstr(ev->text())
 813                 << " isAutoRepeat: " << ev->isAutoRepeat() << " key: " << ev->key());
 814
 815         KeySymbol sym;
 816         setKeySymbol(&sym, ev);
 817         processKeySym(sym, q_key_state(ev->modifiers()));
 818         ev->accept();
 819 }
 820
 821
 822 void GuiWorkArea::doubleClickTimeout()
 823 {
 824         dc_event_.active = false;
 825 }
 826
 827
 828 void GuiWorkArea::mouseDoubleClickEvent(QMouseEvent * ev)
 829 {
 830         dc_event_ = DoubleClick(ev);
 831         QTimer::singleShot(QApplication::doubleClickInterval(), this,
 832                            SLOT(doubleClickTimeout()));
 833         FuncRequest cmd(LFUN_MOUSE_DOUBLE,
 834                         ev->x(), ev->y(),
 835                         q_button_state(ev->button()));
 836         dispatch(cmd);
 837         ev->accept();
 838 }
 839
 840
 841 void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 842 {
 843         QAbstractScrollArea::resizeEvent(ev);
 844         need_resize_ = true;
 845         ev->accept();
 846 }
 847
 848
 849 void GuiWorkArea::update(int x, int y, int w, int h)
 850 {
 851         viewport()->repaint(x, y, w, h);
 852 }
 853
 854
 855 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 856 {
 857         QRect const rc = ev->rect();
 858         // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
 859         //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
 860
 861         if (need_resize_) {
 862                 screen_ = QPixmap(viewport()->width(), viewport()->height());
 863                 resizeBufferView();
 864                 hideCursor();
 865                 showCursor();
 866         }
 867
 868         QPainter pain(viewport());
 869         pain.drawPixmap(rc, screen_, rc);
 870         cursor_->draw(pain);
 871         ev->accept();
 872 }
 873
 874
 875 void GuiWorkArea::updateScreen()
 876 {
 877         GuiPainter pain(&screen_);
 878         buffer_view_->draw(pain);
 879 }
 880
 881
 882 void GuiWorkArea::showCursor(int x, int y, int h,
 883         bool l_shape, bool rtl, bool completable)
 884 {
 885         if (schedule_redraw_) {
 886                 buffer_view_->updateMetrics();
 887                 updateScreen();
 888                 viewport()->update(QRect(0, 0, viewport()->width(), viewport()->height()));
 889                 schedule_redraw_ = false;
 890                 // Show the cursor immediately after the update.
 891                 hideCursor();
 892                 toggleCursor();
 893                 return;
 894         }
 895
 896         cursor_->update(x, y, h, l_shape, rtl, completable);
 897         cursor_->show();
 898         viewport()->update(cursor_->rect());
 899 }
 900
 901
 902 void GuiWorkArea::removeCursor()
 903 {
 904         cursor_->hide();
 905         //if (!qApp->focusWidget())
 906                 viewport()->update(cursor_->rect());
 907 }
 908
 909
 910 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
 911 {
 912         QString const & commit_string = e->commitString();
 913         docstring const & preedit_string
 914                 = qstring_to_ucs4(e->preeditString());
 915
 916         if (!commit_string.isEmpty()) {
 917
 918                 LYXERR(Debug::KEY, "preeditString: " << fromqstr(e->preeditString())
 919                         << " commitString: " << fromqstr(e->commitString()));
 920
 921                 int key = 0;
 922
 923                 // FIXME Iwami 04/01/07: we should take care also of UTF16 surrogates here.
 924                 for (int i = 0; i != commit_string.size(); ++i) {
 925                         QKeyEvent ev(QEvent::KeyPress, key, Qt::NoModifier, commit_string[i]);
 926                         keyPressEvent(&ev);
 927                 }
 928         }
 929
 930         // Hide the cursor during the kana-kanji transformation.
 931         if (preedit_string.empty())
 932                 startBlinkingCursor();
 933         else
 934                 stopBlinkingCursor();
 935
 936         // last_width : for checking if last preedit string was/wasn't empty.
 937         static bool last_width = false;
 938         if (!last_width && preedit_string.empty()) {
 939                 // if last_width is last length of preedit string.
 940                 e->accept();
 941                 return;
 942         }
 943
 944         GuiPainter pain(&screen_);
 945         buffer_view_->updateMetrics();
 946         buffer_view_->draw(pain);
 947         FontInfo font = buffer_view_->cursor().getFont().fontInfo();
 948         FontMetrics const & fm = theFontMetrics(font);
 949         int height = fm.maxHeight();
 950         int cur_x = cursor_->rect().left();
 951         int cur_y = cursor_->rect().bottom();
 952
 953         // redraw area of preedit string.
 954         update(0, cur_y - height, viewport()->width(),
 955                 (height + 1) * preedit_lines_);
 956
 957         if (preedit_string.empty()) {
 958                 last_width = false;
 959                 preedit_lines_ = 1;
 960                 e->accept();
 961                 return;
 962         }
 963         last_width = true;
 964
 965         // att : stores an IM attribute.
 966         QList<QInputMethodEvent::Attribute> const & att = e->attributes();
 967
 968         // get attributes of input method cursor.
 969         // cursor_pos : cursor position in preedit string.
 970         size_t cursor_pos = 0;
 971         bool cursor_is_visible = false;
 972         for (int i = 0; i != att.size(); ++i) {
 973                 if (att.at(i).type == QInputMethodEvent::Cursor) {
 974                         cursor_pos = att.at(i).start;
 975                         cursor_is_visible = att.at(i).length != 0;
 976                         break;
 977                 }
 978         }
 979
 980         size_t preedit_length = preedit_string.length();
 981
 982         // get position of selection in input method.
 983         // FIXME: isn't there a way to do this simplier?
 984         // rStart : cursor position in selected string in IM.
 985         size_t rStart = 0;
 986         // rLength : selected string length in IM.
 987         size_t rLength = 0;
 988         if (cursor_pos < preedit_length) {
 989                 for (int i = 0; i != att.size(); ++i) {
 990                         if (att.at(i).type == QInputMethodEvent::TextFormat) {
 991                                 if (att.at(i).start <= int(cursor_pos)
 992                                         && int(cursor_pos) < att.at(i).start + att.at(i).length) {
 993                                                 rStart = att.at(i).start;
 994                                                 rLength = att.at(i).length;
 995                                                 if (!cursor_is_visible)
 996                                                         cursor_pos += rLength;
 997                                                 break;
 998                                 }
 999                         }
1000                 }
1001         }
1002         else {
1003                 rStart = cursor_pos;
1004                 rLength = 0;
1005         }
1006
1007         int const right_margin = buffer_view_->rightMargin();
1008         Painter::preedit_style ps;
1009         // Most often there would be only one line:
1010         preedit_lines_ = 1;
1011         for (size_t pos = 0; pos != preedit_length; ++pos) {
1012                 char_type const typed_char = preedit_string[pos];
1013                 // reset preedit string style
1014                 ps = Painter::preedit_default;
1015
1016                 // if we reached the right extremity of the screen, go to next line.
1017                 if (cur_x + fm.width(typed_char) > viewport()->width() - right_margin) {
1018                         cur_x = right_margin;
1019                         cur_y += height + 1;
1020                         ++preedit_lines_;
1021                 }
1022                 // preedit strings are displayed with dashed underline
1023                 // and partial strings are displayed white on black indicating
1024                 // that we are in selecting mode in the input method.
1025                 // FIXME: rLength == preedit_length is not a changing condition
1026                 // FIXME: should be put out of the loop.
1027                 if (pos >= rStart
1028                         && pos < rStart + rLength
1029                         && !(cursor_pos < rLength && rLength == preedit_length))
1030                         ps = Painter::preedit_selecting;
1031
1032                 if (pos == cursor_pos
1033                         && (cursor_pos < rLength && rLength == preedit_length))
1034                         ps = Painter::preedit_cursor;
1035
1036                 // draw one character and update cur_x.
1037                 cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
1038         }
1039
1040         // update the preedit string screen area.
1041         update(0, cur_y - preedit_lines_*height, viewport()->width(),
1042                 (height + 1) * preedit_lines_);
1043
1044         // Don't forget to accept the event!
1045         e->accept();
1046 }
1047
1048
1049 QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
1050 {
1051         QRect cur_r(0,0,0,0);
1052         switch (query) {
1053                 // this is the CJK-specific composition window position.
1054                 case Qt::ImMicroFocus:
1055                         cur_r = cursor_->rect();
1056                         if (preedit_lines_ != 1)
1057                                 cur_r.moveLeft(10);
1058                         cur_r.moveBottom(cur_r.bottom() + cur_r.height() * preedit_lines_);
1059                         // return lower right of cursor in LyX.
1060                         return cur_r;
1061                 default:
1062                         return QWidget::inputMethodQuery(query);
1063         }
1064 }
1065
1066
1067 void GuiWorkArea::updateWindowTitle()
1068 {
1069         docstring maximize_title;
1070         docstring minimize_title;
1071
1072         Buffer & buf = buffer_view_->buffer();
1073         FileName const fileName = buf.fileName();
1074         if (!fileName.empty()) {
1075                 maximize_title = fileName.displayName(30);
1076                 minimize_title = from_utf8(fileName.onlyFileName());
1077                 if (!buf.isClean()) {
1078                         maximize_title += _(" (changed)");
1079                         minimize_title += char_type('*');
1080                 }
1081                 if (buf.isReadonly())
1082                         maximize_title += _(" (read only)");
1083         }
1084
1085         QString title = windowTitle();
1086         QString new_title = toqstr(maximize_title);
1087         if (title == new_title)
1088                 return;
1089
1090         QWidget::setWindowTitle(new_title);
1091         QWidget::setWindowIconText(toqstr(minimize_title));
1092         titleChanged(this);
1093 }
1094
1095
1096 void GuiWorkArea::setReadOnly(bool)
1097 {
1098         updateWindowTitle();
1099         if (this == lyx_view_->currentWorkArea())
1100                 lyx_view_->updateBufferDependent(false);
1101 }
1102
1103
1104 bool GuiWorkArea::isFullScreen()
1105 {
1106         return lyx_view_ && lyx_view_->isFullScreen();
1107 }
1108
1109
1110 ////////////////////////////////////////////////////////////////////
1111 //
1112 // TabWorkArea
1113 //
1114 ////////////////////////////////////////////////////////////////////
1115
1116 TabWorkArea::TabWorkArea(QWidget * parent) : QTabWidget(parent)
1117 {
1118         QPalette pal = palette();
1119         pal.setColor(QPalette::Active, QPalette::Button,
1120                 pal.color(QPalette::Active, QPalette::Window));
1121         pal.setColor(QPalette::Disabled, QPalette::Button,
1122                 pal.color(QPalette::Disabled, QPalette::Window));
1123         pal.setColor(QPalette::Inactive, QPalette::Button,
1124                 pal.color(QPalette::Inactive, QPalette::Window));
1125
1126         QObject::connect(this, SIGNAL(currentChanged(int)),
1127                 this, SLOT(on_currentTabChanged(int)));
1128
1129         QToolButton * closeBufferButton = new QToolButton(this);
1130     closeBufferButton->setPalette(pal);
1131         // FIXME: rename the icon to closebuffer.png
1132         closeBufferButton->setIcon(QIcon(":/images/closetab.png"));
1133         closeBufferButton->setText("Close File");
1134         closeBufferButton->setAutoRaise(true);
1135         closeBufferButton->setCursor(Qt::ArrowCursor);
1136         closeBufferButton->setToolTip(qt_("Close File"));
1137         closeBufferButton->setEnabled(true);
1138         QObject::connect(closeBufferButton, SIGNAL(clicked()),
1139                 this, SLOT(closeCurrentBuffer()));
1140         setCornerWidget(closeBufferButton, Qt::TopRightCorner);
1141
1142         QToolButton * closeTabButton = new QToolButton(this);
1143     closeTabButton->setPalette(pal);
1144         closeTabButton->setIcon(QIcon(":/images/hidetab.png"));
1145         closeTabButton->setText("Hide tab");
1146         closeTabButton->setAutoRaise(true);
1147         closeTabButton->setCursor(Qt::ArrowCursor);
1148         closeTabButton->setToolTip(qt_("Hide tab"));
1149         closeTabButton->setEnabled(true);
1150         QObject::connect(closeTabButton, SIGNAL(clicked()),
1151                 this, SLOT(closeCurrentTab()));
1152         setCornerWidget(closeTabButton, Qt::TopLeftCorner);
1153
1154         setUsesScrollButtons(true);
1155 }
1156
1157
1158 void TabWorkArea::setFullScreen(bool full_screen)
1159 {
1160         for (int i = 0; i != count(); ++i) {
1161                 if (GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i)))
1162                         wa->setFullScreen(full_screen);
1163         }
1164
1165         if (lyxrc.full_screen_tabbar)
1166                 showBar(!full_screen && count()>1);
1167 }
1168
1169
1170 void TabWorkArea::showBar(bool show)
1171 {
1172         tabBar()->setEnabled(show);
1173         tabBar()->setVisible(show);
1174 }
1175
1176
1177 GuiWorkArea * TabWorkArea::currentWorkArea()
1178 {
1179         if (count() == 0)
1180                 return 0;
1181
1182         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
1183         BOOST_ASSERT(wa);
1184         return wa;
1185 }
1186
1187
1188 GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
1189 {
1190         for (int i = 0; i != count(); ++i) {
1191                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1192                 BOOST_ASSERT(wa);
1193                 if (&wa->bufferView().buffer() == &buffer)
1194                         return wa;
1195         }
1196         return 0;
1197 }
1198
1199
1200 void TabWorkArea::closeAll()
1201 {
1202         while (count()) {
1203                 GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(0));
1204                 BOOST_ASSERT(wa);
1205                 removeTab(0);
1206                 delete wa;
1207         }
1208 }
1209
1210
1211 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
1212 {
1213         BOOST_ASSERT(work_area);
1214         int index = indexOf(work_area);
1215         if (index == -1)
1216                 return false;
1217
1218         if (index == currentIndex())
1219                 // Make sure the work area is up to date.
1220                 on_currentTabChanged(index);
1221         else
1222                 // Switch to the work area.
1223                 setCurrentIndex(index);
1224         work_area->setFocus();
1225
1226         return true;
1227 }
1228
1229
1230 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
1231 {
1232         GuiWorkArea * wa = new GuiWorkArea(buffer, view);
1233         wa->setUpdatesEnabled(false);
1234         // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
1235         // when hiding it again below).
1236         if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
1237                 showBar(count() > 0);
1238         addTab(wa, wa->windowTitle());
1239         QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
1240                 this, SLOT(updateTabText(GuiWorkArea *)));
1241         if (currentWorkArea() && currentWorkArea()->isFullScreen())
1242                 setFullScreen(true);
1243         else
1244                 // Hide tabbar if there's only one tab.
1245                 showBar(count() > 1);
1246
1247         return wa;
1248 }
1249
1250
1251 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
1252 {
1253         BOOST_ASSERT(work_area);
1254         int index = indexOf(work_area);
1255         if (index == -1)
1256                 return false;
1257
1258         work_area->setUpdatesEnabled(false);
1259         removeTab(index);
1260         delete work_area;
1261
1262         if (count()) {
1263                 // make sure the next work area is enabled.
1264                 currentWidget()->setUpdatesEnabled(true);
1265                 if ((currentWorkArea() && currentWorkArea()->isFullScreen()))
1266                         setFullScreen(true);
1267                 else
1268                         // Hide tabbar if there's only one tab.
1269                         showBar(count() > 1);
1270         }
1271         return true;
1272 }
1273
1274
1275 void TabWorkArea::on_currentTabChanged(int i)
1276 {
1277         GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(widget(i));
1278         BOOST_ASSERT(wa);
1279         BufferView & bv = wa->bufferView();
1280         bv.cursor().fixIfBroken();
1281         bv.updateMetrics();
1282         wa->setUpdatesEnabled(true);
1283         wa->redraw();
1284         wa->setFocus();
1285         ///
1286         currentWorkAreaChanged(wa);
1287
1288         LYXERR(Debug::GUI, "currentTabChanged " << i
1289                 << "File" << bv.buffer().absFileName());
1290 }
1291
1292
1293 void TabWorkArea::closeCurrentBuffer()
1294 {
1295         lyx::dispatch(FuncRequest(LFUN_BUFFER_CLOSE));
1296 }
1297
1298
1299 void TabWorkArea::closeCurrentTab()
1300 {
1301         removeWorkArea(currentWorkArea());
1302 }
1303
1304
1305 void TabWorkArea::updateTabText(GuiWorkArea * wa)
1306 {
1307         int const i = indexOf(wa);
1308         if (i < 0)
1309                 return;
1310         setTabText(i, wa->windowTitle());
1311 }
1312
1313 } // namespace frontend
1314 } // namespace lyx
1315
1316 #include "GuiWorkArea_moc.cpp"