]> git.lyx.org Git - lyx.git/blobdiff - src/frontends/qt4/GuiWorkArea.cpp
Do the actual drawing in the paint event
[lyx.git] / src / frontends / qt4 / GuiWorkArea.cpp
index 9223964e426054b985f033d804bfba52fd83415e..0013670955294c8eb7094be488e6b36ec05838f2 100644 (file)
 
 #include "ColorCache.h"
 #include "FontLoader.h"
+#include "GuiApplication.h"
+#include "GuiCompleter.h"
+#include "GuiKeySymbol.h"
+#include "GuiPainter.h"
+#include "GuiView.h"
 #include "Menus.h"
 
 #include "Buffer.h"
 #include "Cursor.h"
 #include "Font.h"
 #include "FuncRequest.h"
-#include "GuiApplication.h"
-#include "GuiCompleter.h"
-#include "GuiKeySymbol.h"
-#include "GuiPainter.h"
-#include "GuiView.h"
 #include "KeySymbol.h"
 #include "Language.h"
 #include "LyX.h"
@@ -47,7 +47,6 @@
 #include "support/convert.h"
 #include "support/debug.h"
 #include "support/gettext.h"
-#include "support/FileName.h"
 #include "support/lassert.h"
 #include "support/TempFile.h"
 
@@ -213,8 +212,8 @@ public:
        int cursorWidth() const { return cursor_width_; }
        void recomputeWidth() {
                cursor_width_ = lyxrc.cursor_width
-                       ? lyxrc.cursor_width 
-                       : 1 + int((lyxrc.zoom + 50) / 200.0);
+                       ? lyxrc.cursor_width
+                       : 1 + int((lyxrc.currentZoom + 50) / 200.0);
        }
 
        QRect const & rect() { return rect_; }
@@ -234,7 +233,7 @@ private:
        QRect rect_;
        /// x position (were the vertical line is drawn)
        int x_;
-       
+
        int cursor_width_;
 };
 
@@ -247,17 +246,18 @@ SyntheticMouseEvent::SyntheticMouseEvent()
 
 
 GuiWorkArea::Private::Private(GuiWorkArea * parent)
-: p(parent), screen_(0), buffer_view_(0), read_only_(false), lyx_view_(0),
-cursor_visible_(false), cursor_(0),
-need_resize_(false), schedule_redraw_(false), preedit_lines_(1),
-pixel_ratio_(1.0),
-completer_(new GuiCompleter(p, p)), dialog_mode_(false)
+: p(parent), buffer_view_(0), lyx_view_(0),
+  cursor_visible_(false), cursor_(0),
+  need_resize_(false), schedule_redraw_(false), preedit_lines_(1),
+  pixel_ratio_(1.0),
+  completer_(new GuiCompleter(p, p)), dialog_mode_(false), shell_escape_(false),
+  read_only_(false), clean_(true), externally_modified_(false)
 {
 }
 
 
 GuiWorkArea::GuiWorkArea(QWidget * /* w */)
-: d(new Private(this)) 
+: d(new Private(this))
 {
 }
 
@@ -275,7 +275,7 @@ GuiWorkArea::GuiWorkArea(Buffer & buffer, GuiView & gv)
 double GuiWorkArea::pixelRatio() const
 {
 #if QT_VERSION >= 0x050000
-       return devicePixelRatio();
+       return qt_scale_factor * devicePixelRatio();
 #else
        return 1.0;
 #endif
@@ -297,7 +297,6 @@ void GuiWorkArea::init()
                d->cursor_timeout_.setInterval(500);
        }
 
-       d->resetScreen();
        // With Qt4.5 a mouse event will happen before the first paint event
        // so make sure that the buffer view has an up to date metrics.
        d->buffer_view_->resize(viewport()->width(), viewport()->height());
@@ -311,22 +310,20 @@ void GuiWorkArea::init()
        setFrameStyle(QFrame::NoFrame);
        updateWindowTitle();
 
-       viewport()->setAutoFillBackground(false);
+       //viewport()->setAutoFillBackground(false);
        // We don't need double-buffering nor SystemBackground on
        // the viewport because we have our own backing pixmap.
-       viewport()->setAttribute(Qt::WA_NoSystemBackground);
+       //viewport()->setAttribute(Qt::WA_NoSystemBackground);
+       viewport()->setAttribute(Qt::WA_OpaquePaintEvent);
 
        setFocusPolicy(Qt::StrongFocus);
 
        d->setCursorShape(Qt::IBeamCursor);
 
-       d->synthetic_mouse_event_.timeout.timeout.connect(
-               bind(&GuiWorkArea::generateSyntheticMouseEvent,
-                                       this));
-
-       // Initialize the vertical Scroll Bar
-       QObject::connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
-               this, SLOT(scrollTo(int)));
+       // This connection is closed at the same time as this is destroyed.
+       d->synthetic_mouse_event_.timeout.timeout.connect([this](){
+                       generateSyntheticMouseEvent();
+               });
 
        LYXERR(Debug::GUI, "viewport width: " << viewport()->width()
                << "  viewport height: " << viewport()->height());
@@ -341,8 +338,10 @@ void GuiWorkArea::init()
 
 GuiWorkArea::~GuiWorkArea()
 {
-       d->buffer_view_->buffer().workAreaManager().remove(this);
-       delete d->screen_;
+       // If something is wrong with the buffer, we can ignore it safely
+       try {
+               d->buffer_view_->buffer().workAreaManager().remove(this);
+       } catch(...) {}
        delete d->buffer_view_;
        delete d->cursor_;
        // Completer has a QObject parent and is thus automatically destroyed.
@@ -366,7 +365,7 @@ void GuiWorkArea::Private::setCursorShape(Qt::CursorShape shape)
 
 void GuiWorkArea::Private::updateCursorShape()
 {
-       setCursorShape(buffer_view_->clickableInset() 
+       setCursorShape(buffer_view_->clickableInset()
                ? Qt::PointingHandCursor : Qt::IBeamCursor);
 }
 
@@ -392,6 +391,7 @@ void GuiWorkArea::setBuffer(Buffer & buffer)
        if (buffer.text().paragraphs().size() > 4)
                setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
        QTimer::singleShot(50, this, SLOT(fixVerticalScrollBar()));
+       Q_EMIT bufferViewChanged();
 }
 
 
@@ -488,8 +488,7 @@ void GuiWorkArea::redraw(bool update_metrics)
        }
 
        LYXERR(Debug::WORKAREA, "WorkArea::redraw screen");
-       d->updateScreen();
-       update(0, 0, viewport()->width(), viewport()->height());
+       viewport()->update();
 
        /// \warning: scrollbar updating *must* be done after the BufferView is drawn
        /// because \c BufferView::updateScrollbar() is called in \c BufferView::draw().
@@ -588,7 +587,7 @@ void GuiWorkArea::Private::resizeBufferView()
        buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
        if (cursor_in_view)
                buffer_view_->scrollToCursor();
-       updateScreen();
+       p->viewport()->update();
 
        // Update scrollbars which might have changed due different
        // BufferView dimension. This is especially important when the
@@ -670,15 +669,18 @@ void GuiWorkArea::toggleCursor()
 
 void GuiWorkArea::Private::updateScrollbar()
 {
+       // Prevent setRange() and setSliderPosition from causing recursive calls via
+       // the signal valueChanged. (#10311)
+       QObject::disconnect(p->verticalScrollBar(), SIGNAL(valueChanged(int)),
+                           p, SLOT(scrollTo(int)));
        ScrollbarParameters const & scroll_ = buffer_view_->scrollbarParameters();
-       // WARNING: don't touch at the scrollbar value like this:
-       //   verticalScrollBar()->setValue(scroll_.position);
-       // because this would cause a recursive signal/slot calling with
-       // GuiWorkArea::scrollTo
        p->verticalScrollBar()->setRange(scroll_.min, scroll_.max);
        p->verticalScrollBar()->setPageStep(scroll_.page_step);
        p->verticalScrollBar()->setSingleStep(scroll_.single_step);
        p->verticalScrollBar()->setSliderPosition(0);
+       // Connect to the vertical scroll bar
+       QObject::connect(p->verticalScrollBar(), SIGNAL(valueChanged(int)),
+                        p, SLOT(scrollTo(int)));
 }
 
 
@@ -771,9 +773,9 @@ void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
                }
                name = d->buffer_view_->contextMenu(pos.x(), pos.y());
        }
-       
+
        if (name.empty()) {
-               QAbstractScrollArea::contextMenuEvent(e);
+               e->accept();
                return;
        }
        // always show mnemonics when the keyboard is used to show the context menu
@@ -781,7 +783,7 @@ void GuiWorkArea::contextMenuEvent(QContextMenuEvent * e)
        bool const keyboard = (e->reason() == QContextMenuEvent::Keyboard);
        QMenu * menu = guiApp->menus().menu(toqstr(name), *d->lyx_view_, keyboard);
        if (!menu) {
-               QAbstractScrollArea::contextMenuEvent(e);
+               e->accept();
                return;
        }
        // Position the menu to the right.
@@ -887,7 +889,7 @@ void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
                        // in the first place.
                        return;
                }
-               
+
                d->synthetic_mouse_event_.restart_timeout = true;
                d->synthetic_mouse_event_.timeout.start();
                // Fall through to handle this event...
@@ -972,7 +974,7 @@ void GuiWorkArea::generateSyntheticMouseEvent()
                if (up || down) {
                        int dist = up ? -e_y : e_y - wh;
                        time = max(min(200, 250000 / (dist * dist)), 1) ;
-                       
+
                        if (time < 40) {
                                step = 80000 / (time * time);
                                time = 40;
@@ -1000,12 +1002,18 @@ void GuiWorkArea::generateSyntheticMouseEvent()
 
        // In which paragraph do we have to set the cursor ?
        Cursor & cur = d->buffer_view_->cursor();
-       // FIXME: we don't know howto handle math.
+       // FIXME: we don't know how to handle math.
        Text * text = cur.text();
        if (!text)
                return;
        TextMetrics const & tm = d->buffer_view_->textMetrics(text);
 
+       // Quit gracefully if there are no metrics, since otherwise next
+       // line would crash (bug #10324).
+       // This situation seems related to a (not yet understood) timing problem.
+       if (tm.empty())
+               return;
+
        pair<pit_type, const ParagraphMetrics *> pp = up ? tm.first() : tm.last();
        ParagraphMetrics const & pm = *pp.second;
        pit_type const pit = pp.first;
@@ -1148,20 +1156,12 @@ void GuiWorkArea::resizeEvent(QResizeEvent * ev)
 }
 
 
-void GuiWorkArea::Private::update(int x, int y, int w, int h)
-{
-       p->viewport()->update(x, y, w, h);
-}
-
-
 void GuiWorkArea::paintEvent(QPaintEvent * ev)
 {
-       QRectF const rc = ev->rect();
        // LYXERR(Debug::PAINTING, "paintEvent begin: x: " << rc.x()
        //      << " y: " << rc.y() << " w: " << rc.width() << " h: " << rc.height());
 
        if (d->needResize()) {
-               d->resetScreen();
                d->resizeBufferView();
                if (d->cursor_visible_) {
                        d->hideCursor();
@@ -1169,29 +1169,14 @@ void GuiWorkArea::paintEvent(QPaintEvent * ev)
                }
        }
 
-       QPainter pain(viewport());
-       double const pr = pixelRatio();
-       QRectF const rcs = QRectF(rc.x() * pr, rc.y() * pr, rc.width() * pr, rc.height() * pr);
+       GuiPainter pain(viewport(), pixelRatio());
+       d->buffer_view_->draw(pain);
 
-       if (lyxrc.use_qimage) {
-               QImage const & image = static_cast<QImage const &>(*d->screen_);
-               pain.drawImage(rc, image, rcs);
-       } else {
-               QPixmap const & pixmap = static_cast<QPixmap const &>(*d->screen_);
-               pain.drawPixmap(rc, pixmap, rcs);
-       }
        d->cursor_->draw(pain);
        ev->accept();
 }
 
 
-void GuiWorkArea::Private::updateScreen()
-{
-       GuiPainter pain(screen_, p->pixelRatio());
-       buffer_view_->draw(pain);
-}
-
-
 void GuiWorkArea::Private::showCursor(int x, int y, int h,
        bool l_shape, bool rtl, bool completable)
 {
@@ -1201,9 +1186,8 @@ void GuiWorkArea::Private::showCursor(int x, int y, int h,
                // We can't use redraw() here because this would trigger a infinite
                // recursive loop with showCursor().
                buffer_view_->resize(p->viewport()->width(), p->viewport()->height());
-               updateScreen();
+               p->viewport()->update();
                updateScrollbar();
-               p->viewport()->update(QRect(0, 0, p->viewport()->width(), p->viewport()->height()));
                schedule_redraw_ = false;
                // Show the cursor immediately after the update.
                hideCursor();
@@ -1227,6 +1211,10 @@ void GuiWorkArea::Private::removeCursor()
 
 void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
 {
+//FIXME Broken Feature !!
+// I do not think that we are supposed to paint inside this event. Shall we
+// just let TextMetrics::breakRow add this to the relevant Row object?
+#if 0
        QString const & commit_string = e->commitString();
        docstring const & preedit_string
                = qstring_to_ucs4(e->preeditString());
@@ -1252,7 +1240,7 @@ void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
                stopBlinkingCursor();
 
        // last_width : for checking if last preedit string was/wasn't empty.
-       // FIXME THREAD
+       // FIXME THREAD && FIXME
        // We could have more than one work area, right?
        static bool last_width = false;
        if (!last_width && preedit_string.empty()) {
@@ -1261,9 +1249,9 @@ void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
                return;
        }
 
-       GuiPainter pain(d->screen_, pixelRatio());
        d->buffer_view_->updateMetrics();
-       d->buffer_view_->draw(pain);
+       viewport()->update();
+       // FIXME: shall we use real_current_font here? (see #10478)
        FontInfo font = d->buffer_view_->cursor().getFont().fontInfo();
        FontMetrics const & fm = theFontMetrics(font);
        int height = fm.maxHeight();
@@ -1271,7 +1259,7 @@ void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
        int cur_y = d->cursor_->rect().bottom();
 
        // redraw area of preedit string.
-       update(0, cur_y - height, viewport()->width(),
+       viewport()->update(0, cur_y - height, viewport()->width(),
                (height + 1) * d->preedit_lines_);
 
        if (preedit_string.empty()) {
@@ -1354,12 +1342,14 @@ void GuiWorkArea::inputMethodEvent(QInputMethodEvent * e)
                        ps = Painter::preedit_cursor;
 
                // draw one character and update cur_x.
+               GuiPainter pain(d->screen_, pixelRatio());
                cur_x += pain.preeditText(cur_x, cur_y, typed_char, font, ps);
        }
 
        // update the preedit string screen area.
-       update(0, cur_y - d->preedit_lines_*height, viewport()->width(),
+       viewport()->update(0, cur_y - d->preedit_lines_*height, viewport()->width(),
                (height + 1) * d->preedit_lines_);
+#endif
 
        // Don't forget to accept the event!
        e->accept();
@@ -1388,33 +1378,20 @@ QVariant GuiWorkArea::inputMethodQuery(Qt::InputMethodQuery query) const
 
 void GuiWorkArea::updateWindowTitle()
 {
-       docstring maximize_title;
-       docstring minimize_title;
-
-       Buffer const & buf = d->buffer_view_->buffer();
-       FileName const file_name = buf.fileName();
-       if (!file_name.empty()) {
-               maximize_title = file_name.displayName(130);
-               minimize_title = from_utf8(file_name.onlyFileName());
-               if (buf.lyxvc().inUse()) {
-                       if (buf.lyxvc().locking())
-                               maximize_title +=  _(" (version control, locking)");
-                       else
-                               maximize_title +=  _(" (version control)");
-               }
-               if (!buf.isClean()) {
-                       maximize_title += _(" (changed)");
-                       minimize_title += char_type('*');
-               }
-               if (buf.isReadonly())
-                       maximize_title += _(" (read only)");
-       }
-
-       QString const new_title = toqstr(maximize_title);
-       if (new_title != windowTitle()) {
-               QWidget::setWindowTitle(new_title);
-               QWidget::setWindowIconText(toqstr(minimize_title));
-               titleChanged(this);
+       Buffer const & buf = bufferView().buffer();
+       if (buf.fileName() != d->file_name_
+           || buf.params().shell_escape != d->shell_escape_
+           || buf.hasReadonlyFlag() != d->read_only_
+           || buf.lyxvc().vcstatus() != d->vc_status_
+           || buf.isClean() != d->clean_
+           || buf.notifiesExternalModification() != d->externally_modified_) {
+               d->file_name_ = buf.fileName();
+               d->shell_escape_ = buf.params().shell_escape;
+               d->read_only_ = buf.hasReadonlyFlag();
+               d->vc_status_ = buf.lyxvc().vcstatus();
+               d->clean_ = buf.isClean();
+               d->externally_modified_ = buf.notifiesExternalModification();
+               Q_EMIT titleChanged(this);
        }
 }
 
@@ -1630,7 +1607,7 @@ void TabWorkArea::paintEvent(QPaintEvent * event)
        if (tabBar()->isVisible()) {
                QTabWidget::paintEvent(event);
        } else {
-               // Prevent the selected tab to influence the 
+               // Prevent the selected tab to influence the
                // painting of the frame of the tab widget.
                // This is needed for gtk style in Qt.
                QStylePainter p(this);
@@ -1697,26 +1674,41 @@ void TabWorkArea::showBar(bool show)
 }
 
 
-GuiWorkArea * TabWorkArea::currentWorkArea()
+GuiWorkAreaContainer * TabWorkArea::widget(int index) const
 {
-       if (count() == 0)
-               return 0;
+       QWidget * w = QTabWidget::widget(index);
+       if (!w)
+               return nullptr;
+       GuiWorkAreaContainer * wac = dynamic_cast<GuiWorkAreaContainer *>(w);
+       LATTEST(wac);
+       return wac;
+}
 
-       GuiWorkArea * wa = dynamic_cast<GuiWorkArea *>(currentWidget());
-       LATTEST(wa);
-       return wa;
+
+GuiWorkAreaContainer * TabWorkArea::currentWidget() const
+{
+       return widget(currentIndex());
 }
 
 
-GuiWorkArea * TabWorkArea::workArea(int index)
+GuiWorkArea * TabWorkArea::workArea(int index) const
 {
-       return dynamic_cast<GuiWorkArea *>(widget(index));
+       GuiWorkAreaContainer * w = widget(index);
+       if (!w)
+               return nullptr;
+       return w->workArea();
 }
 
 
-GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
+GuiWorkArea * TabWorkArea::currentWorkArea() const
 {
-       // FIXME: this method doesn't work if we have more than work area
+       return workArea(currentIndex());
+}
+
+
+GuiWorkArea * TabWorkArea::workArea(Buffer & buffer) const
+{
+       // FIXME: this method doesn't work if we have more than one work area
        // showing the same buffer.
        for (int i = 0; i != count(); ++i) {
                GuiWorkArea * wa = workArea(i);
@@ -1731,18 +1723,27 @@ GuiWorkArea * TabWorkArea::workArea(Buffer & buffer)
 void TabWorkArea::closeAll()
 {
        while (count()) {
-               GuiWorkArea * wa = workArea(0);
-               LASSERT(wa, return);
+               QWidget * wac = widget(0);
+               LASSERT(wac, return);
                removeTab(0);
-               delete wa;
+               delete wac;
        }
 }
 
 
+int TabWorkArea::indexOfWorkArea(GuiWorkArea * w) const
+{
+       for (int index = 0; index < count(); ++index)
+               if (workArea(index) == w)
+                       return index;
+       return -1;
+}
+
+
 bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
 {
        LASSERT(work_area, return false);
-       int index = indexOf(work_area);
+       int index = indexOfWorkArea(work_area);
        if (index == -1)
                return false;
 
@@ -1761,12 +1762,13 @@ bool TabWorkArea::setCurrentWorkArea(GuiWorkArea * work_area)
 GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
 {
        GuiWorkArea * wa = new GuiWorkArea(buffer, view);
+       GuiWorkAreaContainer * wac = new GuiWorkAreaContainer(wa);
        wa->setUpdatesEnabled(false);
        // Hide tabbar if there's no tab (avoid a resize and a flashing tabbar
        // when hiding it again below).
        if (!(currentWorkArea() && currentWorkArea()->isFullScreen()))
                showBar(count() > 0);
-       addTab(wa, wa->windowTitle());
+       addTab(wac, wa->windowTitle());
        QObject::connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
                this, SLOT(updateTabTexts()));
        if (currentWorkArea() && currentWorkArea()->isFullScreen())
@@ -1784,13 +1786,14 @@ GuiWorkArea * TabWorkArea::addWorkArea(Buffer & buffer, GuiView & view)
 bool TabWorkArea::removeWorkArea(GuiWorkArea * work_area)
 {
        LASSERT(work_area, return false);
-       int index = indexOf(work_area);
+       int index = indexOfWorkArea(work_area);
        if (index == -1)
                return false;
 
        work_area->setUpdatesEnabled(false);
+       QWidget * wac = widget(index);
        removeTab(index);
-       delete work_area;
+       delete wac;
 
        if (count()) {
                // make sure the next work area is enabled.
@@ -1871,8 +1874,7 @@ void TabWorkArea::closeTab(int index)
 class DisplayPath {
 public:
        /// make vector happy
-       // coverity[UNINIT_CTOR]
-       DisplayPath() {}
+       DisplayPath() : tab_(-1), dottedPrefix_(false) {}
        ///
        DisplayPath(int tab, FileName const & filename)
                : tab_(tab)
@@ -2023,17 +2025,18 @@ void TabWorkArea::updateTabTexts()
                                continue;
                        }
 
-                       // we found a non-atomic segment segStart <= sit <= it < next.
+                       // We found a non-atomic segment
+                       // We know that segStart <= it < next <= paths.end().
+                       // The assertion below tells coverity about it.
+                       LATTEST(segStart != paths.end());
+                       QString dspString = segStart->forecastPathString();
+                       LYXERR(Debug::GUI, "first forecast found for "
+                              << segStart->abs() << " => " << dspString);
+                       It sit = segStart;
+                       ++sit;
                        // Shift path segments and hope for the best
                        // that it makes the path more unique.
                        somethingChanged = true;
-                       It sit = segStart;
-                       // this is ok for the reason mentioned  in the previous comment.
-                       // coverity[INVALIDATE_ITERATOR]
-                       QString dspString = sit->forecastPathString();
-                       LYXERR(Debug::GUI, "first forecast found for "
-                              << sit->abs() << " => " << dspString);
-                       ++sit;
                        bool moreUnique = false;
                        for (; sit != next; ++sit) {
                                if (sit->forecastPathString() != dspString) {
@@ -2069,11 +2072,16 @@ void TabWorkArea::updateTabTexts()
                if (!buf.fileName().empty() && !buf.isClean())
                        tab_text += "*";
                QString tab_tooltip = it->abs();
-               if (buf.isReadonly()) {
+               if (buf.hasReadonlyFlag()) {
                        setTabIcon(tab_index, QIcon(getPixmap("images/", "emblem-readonly", "svgz,png")));
-                       tab_tooltip = qt_("%1 (read only)").arg(it->abs());
+                       tab_tooltip = qt_("%1 (read only)").arg(tab_tooltip);
                } else
                        setTabIcon(tab_index, QIcon());
+               if (buf.notifiesExternalModification()) {
+                       QString const warn = qt_("%1 (modified externally)");
+                       tab_tooltip = warn.arg(tab_tooltip);
+                       tab_text += QChar(0x26a0);
+               }
                setTabText(tab_index, tab_text);
                setTabToolTip(tab_index, tab_tooltip);
        }
@@ -2190,6 +2198,58 @@ void DragTabBar::dropEvent(QDropEvent * event)
 }
 
 
+GuiWorkAreaContainer::GuiWorkAreaContainer(GuiWorkArea * wa, QWidget * parent)
+       : QWidget(parent), wa_(wa)
+{
+       LASSERT(wa, return);
+       Ui::WorkAreaUi::setupUi(this);
+       layout()->addWidget(wa);
+       connect(wa, SIGNAL(titleChanged(GuiWorkArea *)),
+               this, SLOT(updateDisplay()));
+       connect(reloadPB, SIGNAL(clicked()), this, SLOT(reload()));
+       connect(ignorePB, SIGNAL(clicked()), this, SLOT(ignore()));
+       setMessageColour({notificationFrame}, {reloadPB, ignorePB});
+       updateDisplay();
+}
+
+
+void GuiWorkAreaContainer::updateDisplay()
+{
+       Buffer const & buf = wa_->bufferView().buffer();
+       notificationFrame->setHidden(!buf.notifiesExternalModification());
+       QString const label = qt_("<b>The file %1 changed on disk.</b>")
+               .arg(toqstr(buf.fileName().displayName()));
+       externalModificationLabel->setText(label);
+}
+
+
+void GuiWorkAreaContainer::dispatch(FuncRequest f) const
+{
+       lyx::dispatch(FuncRequest(LFUN_BUFFER_SWITCH,
+                                 wa_->bufferView().buffer().absFileName()));
+       lyx::dispatch(f);
+}
+
+
+void GuiWorkAreaContainer::reload() const
+{
+       dispatch(FuncRequest(LFUN_BUFFER_RELOAD));
+}
+
+
+void GuiWorkAreaContainer::ignore() const
+{
+       dispatch(FuncRequest(LFUN_BUFFER_EXTERNAL_MODIFICATION_CLEAR));
+}
+
+
+void GuiWorkAreaContainer::mouseDoubleClickEvent(QMouseEvent * event)
+{
+       // prevent TabWorkArea from opening a new buffer on double click
+       event->accept();
+}
+
+
 } // namespace frontend
 } // namespace lyx