pv/mainwindow.cpp

   1 /*
   2  * This file is part of the PulseView project.
   3  *
   4  * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <cassert>
  21
  22 #ifdef ENABLE_DECODE
  23 #include <libsigrokdecode/libsigrokdecode.h>
  24 #endif
  25
  26 #include <algorithm>
  27 #include <iterator>
  28
  29 #include <QAction>
  30 #include <QApplication>
  31 #include <QCloseEvent>
  32 #include <QDockWidget>
  33 #include <QHBoxLayout>
  34 #include <QMessageBox>
  35 #include <QSettings>
  36 #include <QWidget>
  37
  38 #include "mainwindow.hpp"
  39
  40 #include "devicemanager.hpp"
  41 #include "util.hpp"
  42 #include "devices/hardwaredevice.hpp"
  43 #include "dialogs/about.hpp"
  44 #include "toolbars/mainbar.hpp"
  45 #include "view/view.hpp"
  46 #include "views/trace/standardbar.hpp"
  47
  48 #include <stdint.h>
  49 #include <stdarg.h>
  50 #include <libsigrokcxx/libsigrokcxx.hpp>
  51
  52 using std::dynamic_pointer_cast;
  53 using std::list;
  54 using std::make_shared;
  55 using std::map;
  56 using std::shared_ptr;
  57 using std::string;
  58
  59 namespace pv {
  60
  61 namespace view {
  62 class ViewItem;
  63 }
  64
  65 using toolbars::MainBar;
  66
  67 const QString MainWindow::WindowTitle = tr("PulseView");
  68
  69 MainWindow::MainWindow(DeviceManager &device_manager,
  70         string open_file_name, string open_file_format,
  71         QWidget *parent) :
  72         QMainWindow(parent),
  73         device_manager_(device_manager),
  74         session_selector_(this),
  75         session_state_mapper_(this),
  76         action_view_sticky_scrolling_(new QAction(this)),
  77         action_view_coloured_bg_(new QAction(this)),
  78         action_about_(new QAction(this)),
  79         icon_red_(":/icons/status-red.svg"),
  80         icon_green_(":/icons/status-green.svg"),
  81         icon_grey_(":/icons/status-grey.svg")
  82 {
  83         qRegisterMetaType<util::Timestamp>("util::Timestamp");
  84
  85         setup_ui();
  86         restore_ui_settings();
  87
  88         if (!open_file_name.empty()) {
  89                 shared_ptr<Session> session = add_session();
  90                 session->load_init_file(open_file_name, open_file_format);
  91         }
  92
  93         // Add empty default session if there aren't any sessions
  94         if (sessions_.size() == 0) {
  95                 shared_ptr<Session> session = add_session();
  96
  97                 map<string, string> dev_info;
  98                 shared_ptr<devices::HardwareDevice> other_device, demo_device;
  99
 100                 // Use any available device that's not demo
 101                 for (shared_ptr<devices::HardwareDevice> dev : device_manager_.devices()) {
 102                         if (dev->hardware_device()->driver()->name() == "demo") {
 103                                 demo_device = dev;
 104                         } else {
 105                                 other_device = dev;
 106                         }
 107                 }
 108
 109                 // ...and if there isn't any, just use demo then
 110                 session->select_device(other_device ? other_device : demo_device);
 111         }
 112 }
 113
 114 MainWindow::~MainWindow()
 115 {
 116         while (!sessions_.empty())
 117                 remove_session(sessions_.front());
 118 }
 119
 120 QAction* MainWindow::action_view_sticky_scrolling() const
 121 {
 122         return action_view_sticky_scrolling_;
 123 }
 124
 125 QAction* MainWindow::action_view_coloured_bg() const
 126 {
 127         return action_view_coloured_bg_;
 128 }
 129
 130 QAction* MainWindow::action_about() const
 131 {
 132         return action_about_;
 133 }
 134
 135 shared_ptr<views::ViewBase> MainWindow::get_active_view() const
 136 {
 137         // If there's only one view, use it...
 138         if (view_docks_.size() == 1)
 139                 return view_docks_.begin()->second;
 140
 141         // ...otherwise find the dock widget the widget with focus is contained in
 142         QObject *w = QApplication::focusWidget();
 143         QDockWidget *dock = 0;
 144
 145         while (w) {
 146             dock = qobject_cast<QDockWidget*>(w);
 147             if (dock)
 148                 break;
 149             w = w->parent();
 150         }
 151
 152         // Get the view contained in the dock widget
 153         for (auto entry : view_docks_)
 154                 if (entry.first == dock)
 155                         return entry.second;
 156
 157         return nullptr;
 158 }
 159
 160 shared_ptr<views::ViewBase> MainWindow::add_view(const QString &title,
 161         views::ViewType type, Session &session)
 162 {
 163         QMainWindow *main_window = nullptr;
 164         for (auto entry : session_windows_)
 165                 if (entry.first.get() == &session)
 166                         main_window = entry.second;
 167
 168         assert(main_window);
 169
 170         if (type == views::ViewTypeTrace) {
 171                 QDockWidget* dock = new QDockWidget(title, main_window);
 172                 dock->setObjectName(title);
 173                 main_window->addDockWidget(Qt::TopDockWidgetArea, dock);
 174
 175                 // Insert a QMainWindow into the dock widget to allow for a tool bar
 176                 QMainWindow *dock_main = new QMainWindow(dock);
 177                 dock_main->setWindowFlags(Qt::Widget);  // Remove Qt::Window flag
 178
 179                 shared_ptr<views::TraceView::View> v =
 180                         make_shared<views::TraceView::View>(session, dock_main);
 181                 view_docks_[dock] = v;
 182                 session.register_view(v);
 183
 184                 dock_main->setCentralWidget(v.get());
 185                 dock->setWidget(dock_main);
 186
 187                 dock->setFeatures(QDockWidget::DockWidgetMovable |
 188                         QDockWidget::DockWidgetFloatable | QDockWidget::DockWidgetClosable);
 189
 190                 QAbstractButton *close_btn =
 191                         dock->findChildren<QAbstractButton*>
 192                                 ("qt_dockwidget_closebutton").front();
 193
 194                 connect(close_btn, SIGNAL(clicked(bool)),
 195                         this, SLOT(on_view_close_clicked()));
 196
 197                 if (type == views::ViewTypeTrace) {
 198                         connect(&session, SIGNAL(trigger_event(util::Timestamp)),
 199                                 qobject_cast<views::ViewBase*>(v.get()),
 200                                 SLOT(trigger_event(util::Timestamp)));
 201
 202                         v->enable_sticky_scrolling(action_view_sticky_scrolling_->isChecked());
 203                         v->enable_coloured_bg(action_view_coloured_bg_->isChecked());
 204
 205                         shared_ptr<MainBar> main_bar = session.main_bar();
 206                         if (!main_bar) {
 207                                 /* Initial view, create the main bar */
 208                                 main_bar = make_shared<MainBar>(session, this, v.get());
 209                                 dock_main->addToolBar(main_bar.get());
 210                                 session.set_main_bar(main_bar);
 211
 212                                 connect(main_bar.get(), SIGNAL(new_view(Session*)),
 213                                         this, SLOT(on_new_view(Session*)));
 214
 215                                 main_bar->action_view_show_cursors()->setChecked(v->cursors_shown());
 216                         } else {
 217                                 /* Additional view, create a standard bar */
 218                                 pv::views::trace::StandardBar *standard_bar =
 219                                         new pv::views::trace::StandardBar(session, this, v.get());
 220                                 dock_main->addToolBar(standard_bar);
 221
 222                                 standard_bar->action_view_show_cursors()->setChecked(v->cursors_shown());
 223                         }
 224                 }
 225
 226                 return v;
 227         }
 228
 229         return nullptr;
 230 }
 231
 232 void MainWindow::remove_view(shared_ptr<views::ViewBase> view)
 233 {
 234         for (shared_ptr<Session> session : sessions_) {
 235                 if (!session->has_view(view))
 236                         continue;
 237
 238                 // Find the dock the view is contained in and remove it
 239                 for (auto entry : view_docks_)
 240                         if (entry.second == view) {
 241                                 // Remove the view from the session
 242                                 session->deregister_view(view);
 243
 244                                 // Remove the view from its parent; otherwise, Qt will
 245                                 // call deleteLater() on it, which causes a double free
 246                                 // since the shared_ptr in view_docks_ doesn't know
 247                                 // that Qt keeps a pointer to the view around
 248                                 view->setParent(0);
 249
 250                                 // Delete the view's dock widget and all widgets inside it
 251                                 entry.first->deleteLater();
 252
 253                                 // Remove the dock widget from the list and stop iterating
 254                                 view_docks_.erase(entry.first);
 255                                 break;
 256                         }
 257         }
 258 }
 259
 260 shared_ptr<Session> MainWindow::add_session()
 261 {
 262         static int last_session_id = 1;
 263         QString name = tr("Untitled-%1").arg(last_session_id++);
 264
 265         shared_ptr<Session> session = make_shared<Session>(device_manager_, name);
 266
 267         connect(session.get(), SIGNAL(add_view(const QString&, views::ViewType, Session*)),
 268                 this, SLOT(on_add_view(const QString&, views::ViewType, Session*)));
 269         connect(session.get(), SIGNAL(name_changed()),
 270                 this, SLOT(on_session_name_changed()));
 271         session_state_mapper_.setMapping(session.get(), session.get());
 272         connect(session.get(), SIGNAL(capture_state_changed(int)),
 273                 &session_state_mapper_, SLOT(map()));
 274
 275         sessions_.push_back(session);
 276
 277         QMainWindow *window = new QMainWindow();
 278         window->setWindowFlags(Qt::Widget);  // Remove Qt::Window flag
 279         session_windows_[session] = window;
 280
 281         int index = session_selector_.addTab(window, name);
 282         session_selector_.setCurrentIndex(index);
 283         last_focused_session_ = session;
 284
 285         window->setDockNestingEnabled(true);
 286
 287         shared_ptr<views::ViewBase> main_view =
 288                 add_view(name, views::ViewTypeTrace, *session);
 289
 290         return session;
 291 }
 292
 293 void MainWindow::remove_session(shared_ptr<Session> session)
 294 {
 295         int h = new_session_button_->height();
 296
 297         for (shared_ptr<views::ViewBase> view : session->views())
 298                 remove_view(view);
 299
 300         QMainWindow *window = session_windows_.at(session);
 301         session_selector_.removeTab(session_selector_.indexOf(window));
 302
 303         session_windows_.erase(session);
 304
 305         if (last_focused_session_ == session)
 306                 last_focused_session_.reset();
 307
 308         sessions_.remove_if([&](shared_ptr<Session> s) {
 309                 return s == session; });
 310
 311         if (sessions_.empty()) {
 312                 // When there are no more tabs, the height of the QTabWidget
 313                 // drops to zero. We must prevent this to keep the static
 314                 // widgets visible
 315                 for (QWidget *w : static_tab_widget_->findChildren<QWidget*>())
 316                         w->setMinimumHeight(h);
 317
 318                 int margin = static_tab_widget_->layout()->contentsMargins().bottom();
 319                 static_tab_widget_->setMinimumHeight(h + 2 * margin);
 320                 session_selector_.setMinimumHeight(h + 2 * margin);
 321
 322                 // Update the window title if there is no view left to
 323                 // generate focus change events
 324                 setWindowTitle(WindowTitle);
 325         }
 326 }
 327
 328 void MainWindow::setup_ui()
 329 {
 330         setObjectName(QString::fromUtf8("MainWindow"));
 331
 332         setCentralWidget(&session_selector_);
 333
 334         // Set the window icon
 335         QIcon icon;
 336         icon.addFile(QString(":/icons/sigrok-logo-notext.png"));
 337         setWindowIcon(icon);
 338
 339         action_view_sticky_scrolling_->setCheckable(true);
 340         action_view_sticky_scrolling_->setChecked(true);
 341         action_view_sticky_scrolling_->setShortcut(QKeySequence(Qt::Key_S));
 342         action_view_sticky_scrolling_->setObjectName(
 343                 QString::fromUtf8("actionViewStickyScrolling"));
 344         action_view_sticky_scrolling_->setText(tr("&Sticky Scrolling"));
 345
 346         action_view_coloured_bg_->setCheckable(true);
 347         action_view_coloured_bg_->setChecked(true);
 348         action_view_coloured_bg_->setShortcut(QKeySequence(Qt::Key_B));
 349         action_view_coloured_bg_->setObjectName(
 350                 QString::fromUtf8("actionViewColouredBg"));
 351         action_view_coloured_bg_->setText(tr("Use &Coloured Backgrounds"));
 352
 353         action_about_->setObjectName(QString::fromUtf8("actionAbout"));
 354         action_about_->setToolTip(tr("&About..."));
 355
 356         // Set up the tab area
 357         new_session_button_ = new QToolButton();
 358         new_session_button_->setIcon(QIcon::fromTheme("document-new",
 359                 QIcon(":/icons/document-new.png")));
 360         new_session_button_->setToolTip(tr("Create New Session"));
 361         new_session_button_->setAutoRaise(true);
 362
 363         run_stop_button_ = new QToolButton();
 364         run_stop_button_->setAutoRaise(true);
 365         run_stop_button_->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
 366         run_stop_button_->setShortcut(QKeySequence(Qt::Key_Space));
 367         run_stop_button_->setToolTip(tr("Start/Stop Acquisition"));
 368
 369         settings_button_ = new QToolButton();
 370         settings_button_->setIcon(QIcon::fromTheme("configure",
 371                 QIcon(":/icons/configure.png")));
 372         settings_button_->setToolTip(tr("Settings"));
 373         settings_button_->setAutoRaise(true);
 374
 375         QFrame *separator1 = new QFrame();
 376         separator1->setFrameStyle(QFrame::VLine | QFrame::Raised);
 377         QFrame *separator2 = new QFrame();
 378         separator2->setFrameStyle(QFrame::VLine | QFrame::Raised);
 379
 380         QHBoxLayout* layout = new QHBoxLayout();
 381         layout->setContentsMargins(2, 2, 2, 2);
 382         layout->addWidget(new_session_button_);
 383         layout->addWidget(separator1);
 384         layout->addWidget(run_stop_button_);
 385         layout->addWidget(separator2);
 386         layout->addWidget(settings_button_);
 387
 388         static_tab_widget_ = new QWidget();
 389         static_tab_widget_->setLayout(layout);
 390
 391         session_selector_.setCornerWidget(static_tab_widget_, Qt::TopLeftCorner);
 392         session_selector_.setTabsClosable(true);
 393
 394         connect(new_session_button_, SIGNAL(clicked(bool)),
 395                 this, SLOT(on_new_session_clicked()));
 396         connect(run_stop_button_, SIGNAL(clicked(bool)),
 397                 this, SLOT(on_run_stop_clicked()));
 398         connect(&session_state_mapper_, SIGNAL(mapped(QObject*)),
 399                 this, SLOT(on_capture_state_changed(QObject*)));
 400
 401         connect(&session_selector_, SIGNAL(tabCloseRequested(int)),
 402                 this, SLOT(on_tab_close_requested(int)));
 403         connect(&session_selector_, SIGNAL(currentChanged(int)),
 404                 this, SLOT(on_tab_changed(int)));
 405
 406
 407         connect(static_cast<QApplication *>(QCoreApplication::instance()),
 408                 SIGNAL(focusChanged(QWidget*, QWidget*)),
 409                 this, SLOT(on_focus_changed()));
 410 }
 411
 412 void MainWindow::save_ui_settings()
 413 {
 414         QSettings settings;
 415         int id = 0;
 416
 417         settings.beginGroup("MainWindow");
 418         settings.setValue("state", saveState());
 419         settings.setValue("geometry", saveGeometry());
 420         settings.endGroup();
 421
 422         for (shared_ptr<Session> session : sessions_) {
 423                 // Ignore sessions using the demo device or no device at all
 424                 if (session->device()) {
 425                         shared_ptr<devices::HardwareDevice> device =
 426                                 dynamic_pointer_cast< devices::HardwareDevice >
 427                                 (session->device());
 428
 429                         if (device &&
 430                                 device->hardware_device()->driver()->name() == "demo")
 431                                 continue;
 432
 433                         settings.beginGroup("Session" + QString::number(id++));
 434                         settings.remove("");  // Remove all keys in this group
 435                         session->save_settings(settings);
 436                         settings.endGroup();
 437                 }
 438         }
 439
 440         settings.setValue("sessions", id);
 441 }
 442
 443 void MainWindow::restore_ui_settings()
 444 {
 445         QSettings settings;
 446         int i, session_count;
 447
 448         settings.beginGroup("MainWindow");
 449
 450         if (settings.contains("geometry")) {
 451                 restoreGeometry(settings.value("geometry").toByteArray());
 452                 restoreState(settings.value("state").toByteArray());
 453         } else
 454                 resize(1000, 720);
 455
 456         settings.endGroup();
 457
 458         session_count = settings.value("sessions", 0).toInt();
 459
 460         for (i = 0; i < session_count; i++) {
 461                 settings.beginGroup("Session" + QString::number(i));
 462                 shared_ptr<Session> session = add_session();
 463                 session->restore_settings(settings);
 464                 settings.endGroup();
 465         }
 466 }
 467
 468 std::shared_ptr<Session> MainWindow::get_tab_session(int index) const
 469 {
 470         // Find the session that belongs to the tab's main window
 471         for (auto entry : session_windows_)
 472                 if (entry.second == session_selector_.widget(index))
 473                         return entry.first;
 474
 475         return nullptr;
 476 }
 477
 478 void MainWindow::closeEvent(QCloseEvent *event)
 479 {
 480         bool data_saved = true;
 481
 482         for (auto entry : session_windows_)
 483                 if (!entry.first->data_saved())
 484                         data_saved = false;
 485
 486         if (!data_saved && (QMessageBox::question(this, tr("Confirmation"),
 487                 tr("There is unsaved data. Close anyway?"),
 488                 QMessageBox::Yes | QMessageBox::No) == QMessageBox::No)) {
 489                 event->ignore();
 490         } else {
 491                 save_ui_settings();
 492                 event->accept();
 493         }
 494 }
 495
 496 QMenu* MainWindow::createPopupMenu()
 497 {
 498         return nullptr;
 499 }
 500
 501 bool MainWindow::restoreState(const QByteArray &state, int version)
 502 {
 503         (void)state;
 504         (void)version;
 505
 506         // Do nothing. We don't want Qt to handle this, or else it
 507         // will try to restore all the dock widgets and create havoc.
 508
 509         return false;
 510 }
 511
 512 void MainWindow::session_error(const QString text, const QString info_text)
 513 {
 514         QMetaObject::invokeMethod(this, "show_session_error",
 515                 Qt::QueuedConnection, Q_ARG(QString, text),
 516                 Q_ARG(QString, info_text));
 517 }
 518
 519 void MainWindow::show_session_error(const QString text, const QString info_text)
 520 {
 521         QMessageBox msg(this);
 522         msg.setText(text);
 523         msg.setInformativeText(info_text);
 524         msg.setStandardButtons(QMessageBox::Ok);
 525         msg.setIcon(QMessageBox::Warning);
 526         msg.exec();
 527 }
 528
 529 void MainWindow::on_add_view(const QString &title, views::ViewType type,
 530         Session *session)
 531 {
 532         // We get a pointer and need a reference
 533         for (std::shared_ptr<Session> s : sessions_)
 534                 if (s.get() == session)
 535                         add_view(title, type, *s);
 536 }
 537
 538 void MainWindow::on_focus_changed()
 539 {
 540         shared_ptr<views::ViewBase> view = get_active_view();
 541
 542         if (view) {
 543                 for (shared_ptr<Session> session : sessions_) {
 544                         if (session->has_view(view)) {
 545                                 if (session != last_focused_session_) {
 546                                         // Activate correct tab if necessary
 547                                         shared_ptr<Session> tab_session = get_tab_session(
 548                                                 session_selector_.currentIndex());
 549                                         if (tab_session != session)
 550                                                 session_selector_.setCurrentWidget(
 551                                                         session_windows_.at(session));
 552
 553                                         on_focused_session_changed(session);
 554                                 }
 555
 556                                 break;
 557                         }
 558                 }
 559         }
 560
 561         if (sessions_.empty())
 562                 setWindowTitle(WindowTitle);
 563 }
 564
 565 void MainWindow::on_focused_session_changed(shared_ptr<Session> session)
 566 {
 567         last_focused_session_ = session;
 568
 569         setWindowTitle(session->name() + " - " + WindowTitle);
 570
 571         // Update the state of the run/stop button, too
 572         on_capture_state_changed(session.get());
 573 }
 574
 575 void MainWindow::on_new_session_clicked()
 576 {
 577         add_session();
 578 }
 579
 580 void MainWindow::on_run_stop_clicked()
 581 {
 582         shared_ptr<Session> session = last_focused_session_;
 583
 584         if (!session)
 585                 return;
 586
 587         switch (session->get_capture_state()) {
 588         case Session::Stopped:
 589                 session->start_capture([&](QString message) {
 590                         session_error("Capture failed", message); });
 591                 break;
 592         case Session::AwaitingTrigger:
 593         case Session::Running:
 594                 session->stop_capture();
 595                 break;
 596         }
 597 }
 598
 599 void MainWindow::on_session_name_changed()
 600 {
 601         // Update the corresponding dock widget's name(s)
 602         Session *session = qobject_cast<Session*>(QObject::sender());
 603         assert(session);
 604
 605         for (shared_ptr<views::ViewBase> view : session->views()) {
 606                 // Get the dock that contains the view
 607                 for (auto entry : view_docks_)
 608                         if (entry.second == view) {
 609                                 entry.first->setObjectName(session->name());
 610                                 entry.first->setWindowTitle(session->name());
 611                         }
 612         }
 613
 614         // Update the tab widget by finding the main window and the tab from that
 615         for (auto entry : session_windows_)
 616                 if (entry.first.get() == session) {
 617                         QMainWindow *window = entry.second;
 618                         const int index = session_selector_.indexOf(window);
 619                         session_selector_.setTabText(index, session->name());
 620                 }
 621
 622         // Refresh window title if the affected session has focus
 623         if (session == last_focused_session_.get())
 624                 setWindowTitle(session->name() + " - " + WindowTitle);
 625 }
 626
 627 void MainWindow::on_capture_state_changed(QObject *obj)
 628 {
 629         Session *caller = qobject_cast<Session*>(obj);
 630
 631         // Ignore if caller is not the currently focused session
 632         // unless there is only one session
 633         if ((sessions_.size() > 1) && (caller != last_focused_session_.get()))
 634                 return;
 635
 636         int state = caller->get_capture_state();
 637
 638         const QIcon *icons[] = {&icon_grey_, &icon_red_, &icon_green_};
 639         run_stop_button_->setIcon(*icons[state]);
 640         run_stop_button_->setText((state == pv::Session::Stopped) ?
 641                 tr("Run") : tr("Stop"));
 642 }
 643
 644 void MainWindow::on_new_view(Session *session)
 645 {
 646         // We get a pointer and need a reference
 647         for (std::shared_ptr<Session> s : sessions_)
 648                 if (s.get() == session)
 649                         add_view(session->name(), views::ViewTypeTrace, *s);
 650 }
 651
 652 void MainWindow::on_view_close_clicked()
 653 {
 654         // Find the dock widget that contains the close button that was clicked
 655         QObject *w = QObject::sender();
 656         QDockWidget *dock = 0;
 657
 658         while (w) {
 659             dock = qobject_cast<QDockWidget*>(w);
 660             if (dock)
 661                 break;
 662             w = w->parent();
 663         }
 664
 665         // Get the view contained in the dock widget
 666         shared_ptr<views::ViewBase> view;
 667
 668         for (auto entry : view_docks_)
 669                 if (entry.first == dock)
 670                         view = entry.second;
 671
 672         // Deregister the view
 673         for (shared_ptr<Session> session : sessions_) {
 674                 if (!session->has_view(view))
 675                         continue;
 676
 677                 // Also destroy the entire session if its main view is closing
 678                 if (view == session->main_view()) {
 679                         remove_session(session);
 680                         break;
 681                 } else
 682                         remove_view(view);
 683         }
 684 }
 685
 686 void MainWindow::on_tab_changed(int index)
 687 {
 688         shared_ptr<Session> session = get_tab_session(index);
 689
 690         if (session)
 691                 on_focused_session_changed(session);
 692 }
 693
 694 void MainWindow::on_tab_close_requested(int index)
 695 {
 696         shared_ptr<Session> session = get_tab_session(index);
 697
 698         assert(session);
 699
 700         if (session->data_saved() || (QMessageBox::question(this, tr("Confirmation"),
 701                 tr("This session contains unsaved data. Close it anyway?"),
 702                 QMessageBox::Yes | QMessageBox::No) == QMessageBox::Yes))
 703                 remove_session(session);
 704 }
 705
 706 void MainWindow::on_actionViewStickyScrolling_triggered()
 707 {
 708         shared_ptr<views::ViewBase> viewbase = get_active_view();
 709         views::TraceView::View* view =
 710                 qobject_cast<views::TraceView::View*>(viewbase.get());
 711         if (view)
 712                 view->enable_sticky_scrolling(action_view_sticky_scrolling_->isChecked());
 713 }
 714
 715 void MainWindow::on_actionViewColouredBg_triggered()
 716 {
 717         shared_ptr<views::ViewBase> viewbase = get_active_view();
 718         views::TraceView::View* view =
 719                         qobject_cast<views::TraceView::View*>(viewbase.get());
 720         if (view)
 721                 view->enable_coloured_bg(action_view_coloured_bg_->isChecked());
 722 }
 723
 724 void MainWindow::on_actionAbout_triggered()
 725 {
 726         dialogs::About dlg(device_manager_.context(), this);
 727         dlg.exec();
 728 }
 729
 730 } // namespace pv