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         qRegisterMetaType<uint64_t>("uint64_t");
  85
  86         setup_ui();
  87         restore_ui_settings();
  88
  89         if (!open_file_name.empty()) {
  90                 shared_ptr<Session> session = add_session();
  91                 session->load_init_file(open_file_name, open_file_format);
  92         }
  93
  94         // Add empty default session if there aren't any sessions
  95         if (sessions_.size() == 0) {
  96                 shared_ptr<Session> session = add_session();
  97
  98                 map<string, string> dev_info;
  99                 shared_ptr<devices::HardwareDevice> other_device, demo_device;
 100
 101                 // Use any available device that's not demo
 102                 for (shared_ptr<devices::HardwareDevice> dev : device_manager_.devices()) {
 103                         if (dev->hardware_device()->driver()->name() == "demo") {
 104                                 demo_device = dev;
 105                         } else {
 106                                 other_device = dev;
 107                         }
 108                 }
 109
 110                 // ...and if there isn't any, just use demo then
 111                 session->select_device(other_device ? other_device : demo_device);
 112         }
 113 }
 114
 115 MainWindow::~MainWindow()
 116 {
 117         while (!sessions_.empty())
 118                 remove_session(sessions_.front());
 119 }
 120
 121 QAction* MainWindow::action_view_sticky_scrolling() const
 122 {
 123         return action_view_sticky_scrolling_;
 124 }
 125
 126 QAction* MainWindow::action_view_coloured_bg() const
 127 {
 128         return action_view_coloured_bg_;
 129 }
 130
 131 QAction* MainWindow::action_about() const
 132 {
 133         return action_about_;
 134 }
 135
 136 shared_ptr<views::ViewBase> MainWindow::get_active_view() const
 137 {
 138         // If there's only one view, use it...
 139         if (view_docks_.size() == 1)
 140                 return view_docks_.begin()->second;
 141
 142         // ...otherwise find the dock widget the widget with focus is contained in
 143         QObject *w = QApplication::focusWidget();
 144         QDockWidget *dock = 0;
 145
 146         while (w) {
 147             dock = qobject_cast<QDockWidget*>(w);
 148             if (dock)
 149                 break;
 150             w = w->parent();
 151         }
 152
 153         // Get the view contained in the dock widget
 154         for (auto entry : view_docks_)
 155                 if (entry.first == dock)
 156                         return entry.second;
 157
 158         return nullptr;
 159 }
 160
 161 shared_ptr<views::ViewBase> MainWindow::add_view(const QString &title,
 162         views::ViewType type, Session &session)
 163 {
 164         QMainWindow *main_window = nullptr;
 165         for (auto entry : session_windows_)
 166                 if (entry.first.get() == &session)
 167                         main_window = entry.second;
 168
 169         assert(main_window);
 170
 171         if (type == views::ViewTypeTrace) {
 172                 QDockWidget* dock = new QDockWidget(title, main_window);
 173                 dock->setObjectName(title);
 174                 main_window->addDockWidget(Qt::TopDockWidgetArea, dock);
 175
 176                 // Insert a QMainWindow into the dock widget to allow for a tool bar
 177                 QMainWindow *dock_main = new QMainWindow(dock);
 178                 dock_main->setWindowFlags(Qt::Widget);  // Remove Qt::Window flag
 179
 180                 shared_ptr<views::TraceView::View> v =
 181                         make_shared<views::TraceView::View>(session, dock_main);
 182                 view_docks_[dock] = v;
 183                 session.register_view(v);
 184
 185                 dock_main->setCentralWidget(v.get());
 186                 dock->setWidget(dock_main);
 187
 188                 dock->setFeatures(QDockWidget::DockWidgetMovable |
 189                         QDockWidget::DockWidgetFloatable | QDockWidget::DockWidgetClosable);
 190
 191                 QAbstractButton *close_btn =
 192                         dock->findChildren<QAbstractButton*>
 193                                 ("qt_dockwidget_closebutton").front();
 194
 195                 connect(close_btn, SIGNAL(clicked(bool)),
 196                         this, SLOT(on_view_close_clicked()));
 197
 198                 if (type == views::ViewTypeTrace) {
 199                         connect(&session, SIGNAL(trigger_event(util::Timestamp)),
 200                                 qobject_cast<views::ViewBase*>(v.get()),
 201                                 SLOT(trigger_event(util::Timestamp)));
 202
 203                         v->enable_sticky_scrolling(action_view_sticky_scrolling_->isChecked());
 204                         v->enable_coloured_bg(action_view_coloured_bg_->isChecked());
 205
 206                         shared_ptr<MainBar> main_bar = session.main_bar();
 207                         if (!main_bar) {
 208                                 /* Initial view, create the main bar */
 209                                 main_bar = make_shared<MainBar>(session, this, v.get());
 210                                 dock_main->addToolBar(main_bar.get());
 211                                 session.set_main_bar(main_bar);
 212
 213                                 connect(main_bar.get(), SIGNAL(new_view(Session*)),
 214                                         this, SLOT(on_new_view(Session*)));
 215
 216                                 main_bar->action_view_show_cursors()->setChecked(v->cursors_shown());
 217
 218                                 /* For the main view we need to prevent the dock widget from
 219                                  * closing itself when its close button is clicked. This is
 220                                  * so we can confirm with the user first. Regular views don't
 221                                  * need this */
 222                                 close_btn->disconnect(SIGNAL(clicked()), dock, SLOT(close()));
 223                         } else {
 224                                 /* Additional view, create a standard bar */
 225                                 pv::views::trace::StandardBar *standard_bar =
 226                                         new pv::views::trace::StandardBar(session, this, v.get());
 227                                 dock_main->addToolBar(standard_bar);
 228
 229                                 standard_bar->action_view_show_cursors()->setChecked(v->cursors_shown());
 230                         }
 231                 }
 232
 233                 return v;
 234         }
 235
 236         return nullptr;
 237 }
 238
 239 void MainWindow::remove_view(shared_ptr<views::ViewBase> view)
 240 {
 241         for (shared_ptr<Session> session : sessions_) {
 242                 if (!session->has_view(view))
 243                         continue;
 244
 245                 // Find the dock the view is contained in and remove it
 246                 for (auto entry : view_docks_)
 247                         if (entry.second == view) {
 248                                 // Remove the view from the session
 249                                 session->deregister_view(view);
 250
 251                                 // Remove the view from its parent; otherwise, Qt will
 252                                 // call deleteLater() on it, which causes a double free
 253                                 // since the shared_ptr in view_docks_ doesn't know
 254                                 // that Qt keeps a pointer to the view around
 255                                 view->setParent(0);
 256
 257                                 // Delete the view's dock widget and all widgets inside it
 258                                 entry.first->deleteLater();
 259
 260                                 // Remove the dock widget from the list and stop iterating
 261                                 view_docks_.erase(entry.first);
 262                                 break;
 263                         }
 264         }
 265 }
 266
 267 shared_ptr<Session> MainWindow::add_session()
 268 {
 269         static int last_session_id = 1;
 270         QString name = tr("Untitled-%1").arg(last_session_id++);
 271
 272         shared_ptr<Session> session = make_shared<Session>(device_manager_, name);
 273
 274         connect(session.get(), SIGNAL(add_view(const QString&, views::ViewType, Session*)),
 275                 this, SLOT(on_add_view(const QString&, views::ViewType, Session*)));
 276         connect(session.get(), SIGNAL(name_changed()),
 277                 this, SLOT(on_session_name_changed()));
 278         session_state_mapper_.setMapping(session.get(), session.get());
 279         connect(session.get(), SIGNAL(capture_state_changed(int)),
 280                 &session_state_mapper_, SLOT(map()));
 281
 282         sessions_.push_back(session);
 283
 284         QMainWindow *window = new QMainWindow();
 285         window->setWindowFlags(Qt::Widget);  // Remove Qt::Window flag
 286         session_windows_[session] = window;
 287
 288         int index = session_selector_.addTab(window, name);
 289         session_selector_.setCurrentIndex(index);
 290         last_focused_session_ = session;
 291
 292         window->setDockNestingEnabled(true);
 293
 294         shared_ptr<views::ViewBase> main_view =
 295                 add_view(name, views::ViewTypeTrace, *session);
 296
 297         return session;
 298 }
 299
 300 void MainWindow::remove_session(shared_ptr<Session> session)
 301 {
 302         int h = new_session_button_->height();
 303
 304         for (shared_ptr<views::ViewBase> view : session->views())
 305                 remove_view(view);
 306
 307         QMainWindow *window = session_windows_.at(session);
 308         session_selector_.removeTab(session_selector_.indexOf(window));
 309
 310         session_windows_.erase(session);
 311
 312         if (last_focused_session_ == session)
 313                 last_focused_session_.reset();
 314
 315         sessions_.remove_if([&](shared_ptr<Session> s) {
 316                 return s == session; });
 317
 318         if (sessions_.empty()) {
 319                 // When there are no more tabs, the height of the QTabWidget
 320                 // drops to zero. We must prevent this to keep the static
 321                 // widgets visible
 322                 for (QWidget *w : static_tab_widget_->findChildren<QWidget*>())
 323                         w->setMinimumHeight(h);
 324
 325                 int margin = static_tab_widget_->layout()->contentsMargins().bottom();
 326                 static_tab_widget_->setMinimumHeight(h + 2 * margin);
 327                 session_selector_.setMinimumHeight(h + 2 * margin);
 328
 329                 // Update the window title if there is no view left to
 330                 // generate focus change events
 331                 setWindowTitle(WindowTitle);
 332         }
 333 }
 334
 335 void MainWindow::setup_ui()
 336 {
 337         setObjectName(QString::fromUtf8("MainWindow"));
 338
 339         setCentralWidget(&session_selector_);
 340
 341         // Set the window icon
 342         QIcon icon;
 343         icon.addFile(QString(":/icons/sigrok-logo-notext.png"));
 344         setWindowIcon(icon);
 345
 346         action_view_sticky_scrolling_->setCheckable(true);
 347         action_view_sticky_scrolling_->setChecked(true);
 348         action_view_sticky_scrolling_->setShortcut(QKeySequence(Qt::Key_S));
 349         action_view_sticky_scrolling_->setObjectName(
 350                 QString::fromUtf8("actionViewStickyScrolling"));
 351         action_view_sticky_scrolling_->setText(tr("&Sticky Scrolling"));
 352
 353         action_view_coloured_bg_->setCheckable(true);
 354         action_view_coloured_bg_->setChecked(true);
 355         action_view_coloured_bg_->setShortcut(QKeySequence(Qt::Key_B));
 356         action_view_coloured_bg_->setObjectName(
 357                 QString::fromUtf8("actionViewColouredBg"));
 358         action_view_coloured_bg_->setText(tr("Use &Coloured Backgrounds"));
 359
 360         action_about_->setObjectName(QString::fromUtf8("actionAbout"));
 361         action_about_->setToolTip(tr("&About..."));
 362
 363         // Set up the tab area
 364         new_session_button_ = new QToolButton();
 365         new_session_button_->setIcon(QIcon::fromTheme("document-new",
 366                 QIcon(":/icons/document-new.png")));
 367         new_session_button_->setToolTip(tr("Create New Session"));
 368         new_session_button_->setAutoRaise(true);
 369
 370         run_stop_button_ = new QToolButton();
 371         run_stop_button_->setAutoRaise(true);
 372         run_stop_button_->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
 373         run_stop_button_->setShortcut(QKeySequence(Qt::Key_Space));
 374         run_stop_button_->setToolTip(tr("Start/Stop Acquisition"));
 375
 376         settings_button_ = new QToolButton();
 377         settings_button_->setIcon(QIcon::fromTheme("configure",
 378                 QIcon(":/icons/configure.png")));
 379         settings_button_->setToolTip(tr("Settings"));
 380         settings_button_->setAutoRaise(true);
 381
 382         QFrame *separator1 = new QFrame();
 383         separator1->setFrameStyle(QFrame::VLine | QFrame::Raised);
 384         QFrame *separator2 = new QFrame();
 385         separator2->setFrameStyle(QFrame::VLine | QFrame::Raised);
 386
 387         QHBoxLayout* layout = new QHBoxLayout();
 388         layout->setContentsMargins(2, 2, 2, 2);
 389         layout->addWidget(new_session_button_);
 390         layout->addWidget(separator1);
 391         layout->addWidget(run_stop_button_);
 392         layout->addWidget(separator2);
 393         layout->addWidget(settings_button_);
 394
 395         static_tab_widget_ = new QWidget();
 396         static_tab_widget_->setLayout(layout);
 397
 398         session_selector_.setCornerWidget(static_tab_widget_, Qt::TopLeftCorner);
 399         session_selector_.setTabsClosable(true);
 400
 401         connect(new_session_button_, SIGNAL(clicked(bool)),
 402                 this, SLOT(on_new_session_clicked()));
 403         connect(run_stop_button_, SIGNAL(clicked(bool)),
 404                 this, SLOT(on_run_stop_clicked()));
 405         connect(&session_state_mapper_, SIGNAL(mapped(QObject*)),
 406                 this, SLOT(on_capture_state_changed(QObject*)));
 407
 408         connect(&session_selector_, SIGNAL(tabCloseRequested(int)),
 409                 this, SLOT(on_tab_close_requested(int)));
 410         connect(&session_selector_, SIGNAL(currentChanged(int)),
 411                 this, SLOT(on_tab_changed(int)));
 412
 413
 414         connect(static_cast<QApplication *>(QCoreApplication::instance()),
 415                 SIGNAL(focusChanged(QWidget*, QWidget*)),
 416                 this, SLOT(on_focus_changed()));
 417 }
 418
 419 void MainWindow::save_ui_settings()
 420 {
 421         QSettings settings;
 422         int id = 0;
 423
 424         settings.beginGroup("MainWindow");
 425         settings.setValue("state", saveState());
 426         settings.setValue("geometry", saveGeometry());
 427         settings.endGroup();
 428
 429         for (shared_ptr<Session> session : sessions_) {
 430                 // Ignore sessions using the demo device or no device at all
 431                 if (session->device()) {
 432                         shared_ptr<devices::HardwareDevice> device =
 433                                 dynamic_pointer_cast< devices::HardwareDevice >
 434                                 (session->device());
 435
 436                         if (device &&
 437                                 device->hardware_device()->driver()->name() == "demo")
 438                                 continue;
 439
 440                         settings.beginGroup("Session" + QString::number(id++));
 441                         settings.remove("");  // Remove all keys in this group
 442                         session->save_settings(settings);
 443                         settings.endGroup();
 444                 }
 445         }
 446
 447         settings.setValue("sessions", id);
 448 }
 449
 450 void MainWindow::restore_ui_settings()
 451 {
 452         QSettings settings;
 453         int i, session_count;
 454
 455         settings.beginGroup("MainWindow");
 456
 457         if (settings.contains("geometry")) {
 458                 restoreGeometry(settings.value("geometry").toByteArray());
 459                 restoreState(settings.value("state").toByteArray());
 460         } else
 461                 resize(1000, 720);
 462
 463         settings.endGroup();
 464
 465         session_count = settings.value("sessions", 0).toInt();
 466
 467         for (i = 0; i < session_count; i++) {
 468                 settings.beginGroup("Session" + QString::number(i));
 469                 shared_ptr<Session> session = add_session();
 470                 session->restore_settings(settings);
 471                 settings.endGroup();
 472         }
 473 }
 474
 475 std::shared_ptr<Session> MainWindow::get_tab_session(int index) const
 476 {
 477         // Find the session that belongs to the tab's main window
 478         for (auto entry : session_windows_)
 479                 if (entry.second == session_selector_.widget(index))
 480                         return entry.first;
 481
 482         return nullptr;
 483 }
 484
 485 void MainWindow::closeEvent(QCloseEvent *event)
 486 {
 487         bool data_saved = true;
 488
 489         for (auto entry : session_windows_)
 490                 if (!entry.first->data_saved())
 491                         data_saved = false;
 492
 493         if (!data_saved && (QMessageBox::question(this, tr("Confirmation"),
 494                 tr("There is unsaved data. Close anyway?"),
 495                 QMessageBox::Yes | QMessageBox::No) == QMessageBox::No)) {
 496                 event->ignore();
 497         } else {
 498                 save_ui_settings();
 499                 event->accept();
 500         }
 501 }
 502
 503 QMenu* MainWindow::createPopupMenu()
 504 {
 505         return nullptr;
 506 }
 507
 508 bool MainWindow::restoreState(const QByteArray &state, int version)
 509 {
 510         (void)state;
 511         (void)version;
 512
 513         // Do nothing. We don't want Qt to handle this, or else it
 514         // will try to restore all the dock widgets and create havoc.
 515
 516         return false;
 517 }
 518
 519 void MainWindow::session_error(const QString text, const QString info_text)
 520 {
 521         QMetaObject::invokeMethod(this, "show_session_error",
 522                 Qt::QueuedConnection, Q_ARG(QString, text),
 523                 Q_ARG(QString, info_text));
 524 }
 525
 526 void MainWindow::show_session_error(const QString text, const QString info_text)
 527 {
 528         QMessageBox msg(this);
 529         msg.setText(text);
 530         msg.setInformativeText(info_text);
 531         msg.setStandardButtons(QMessageBox::Ok);
 532         msg.setIcon(QMessageBox::Warning);
 533         msg.exec();
 534 }
 535
 536 void MainWindow::on_add_view(const QString &title, views::ViewType type,
 537         Session *session)
 538 {
 539         // We get a pointer and need a reference
 540         for (std::shared_ptr<Session> s : sessions_)
 541                 if (s.get() == session)
 542                         add_view(title, type, *s);
 543 }
 544
 545 void MainWindow::on_focus_changed()
 546 {
 547         shared_ptr<views::ViewBase> view = get_active_view();
 548
 549         if (view) {
 550                 for (shared_ptr<Session> session : sessions_) {
 551                         if (session->has_view(view)) {
 552                                 if (session != last_focused_session_) {
 553                                         // Activate correct tab if necessary
 554                                         shared_ptr<Session> tab_session = get_tab_session(
 555                                                 session_selector_.currentIndex());
 556                                         if (tab_session != session)
 557                                                 session_selector_.setCurrentWidget(
 558                                                         session_windows_.at(session));
 559
 560                                         on_focused_session_changed(session);
 561                                 }
 562
 563                                 break;
 564                         }
 565                 }
 566         }
 567
 568         if (sessions_.empty())
 569                 setWindowTitle(WindowTitle);
 570 }
 571
 572 void MainWindow::on_focused_session_changed(shared_ptr<Session> session)
 573 {
 574         last_focused_session_ = session;
 575
 576         setWindowTitle(session->name() + " - " + WindowTitle);
 577
 578         // Update the state of the run/stop button, too
 579         on_capture_state_changed(session.get());
 580 }
 581
 582 void MainWindow::on_new_session_clicked()
 583 {
 584         add_session();
 585 }
 586
 587 void MainWindow::on_run_stop_clicked()
 588 {
 589         shared_ptr<Session> session = last_focused_session_;
 590
 591         if (!session)
 592                 return;
 593
 594         switch (session->get_capture_state()) {
 595         case Session::Stopped:
 596                 session->start_capture([&](QString message) {
 597                         session_error("Capture failed", message); });
 598                 break;
 599         case Session::AwaitingTrigger:
 600         case Session::Running:
 601                 session->stop_capture();
 602                 break;
 603         }
 604 }
 605
 606 void MainWindow::on_session_name_changed()
 607 {
 608         // Update the corresponding dock widget's name(s)
 609         Session *session = qobject_cast<Session*>(QObject::sender());
 610         assert(session);
 611
 612         for (shared_ptr<views::ViewBase> view : session->views()) {
 613                 // Get the dock that contains the view
 614                 for (auto entry : view_docks_)
 615                         if (entry.second == view) {
 616                                 entry.first->setObjectName(session->name());
 617                                 entry.first->setWindowTitle(session->name());
 618                         }
 619         }
 620
 621         // Update the tab widget by finding the main window and the tab from that
 622         for (auto entry : session_windows_)
 623                 if (entry.first.get() == session) {
 624                         QMainWindow *window = entry.second;
 625                         const int index = session_selector_.indexOf(window);
 626                         session_selector_.setTabText(index, session->name());
 627                 }
 628
 629         // Refresh window title if the affected session has focus
 630         if (session == last_focused_session_.get())
 631                 setWindowTitle(session->name() + " - " + WindowTitle);
 632 }
 633
 634 void MainWindow::on_capture_state_changed(QObject *obj)
 635 {
 636         Session *caller = qobject_cast<Session*>(obj);
 637
 638         // Ignore if caller is not the currently focused session
 639         // unless there is only one session
 640         if ((sessions_.size() > 1) && (caller != last_focused_session_.get()))
 641                 return;
 642
 643         int state = caller->get_capture_state();
 644
 645         const QIcon *icons[] = {&icon_grey_, &icon_red_, &icon_green_};
 646         run_stop_button_->setIcon(*icons[state]);
 647         run_stop_button_->setText((state == pv::Session::Stopped) ?
 648                 tr("Run") : tr("Stop"));
 649 }
 650
 651 void MainWindow::on_new_view(Session *session)
 652 {
 653         // We get a pointer and need a reference
 654         for (std::shared_ptr<Session> s : sessions_)
 655                 if (s.get() == session)
 656                         add_view(session->name(), views::ViewTypeTrace, *s);
 657 }
 658
 659 void MainWindow::on_view_close_clicked()
 660 {
 661         // Find the dock widget that contains the close button that was clicked
 662         QObject *w = QObject::sender();
 663         QDockWidget *dock = 0;
 664
 665         while (w) {
 666             dock = qobject_cast<QDockWidget*>(w);
 667             if (dock)
 668                 break;
 669             w = w->parent();
 670         }
 671
 672         // Get the view contained in the dock widget
 673         shared_ptr<views::ViewBase> view;
 674
 675         for (auto entry : view_docks_)
 676                 if (entry.first == dock)
 677                         view = entry.second;
 678
 679         // Deregister the view
 680         for (shared_ptr<Session> session : sessions_) {
 681                 if (!session->has_view(view))
 682                         continue;
 683
 684                 // Also destroy the entire session if its main view is closing...
 685                 if (view == session->main_view()) {
 686                         // ...but only if data is saved or the user confirms closing
 687                         if (session->data_saved() || (QMessageBox::question(this, tr("Confirmation"),
 688                                 tr("This session contains unsaved data. Close it anyway?"),
 689                                 QMessageBox::Yes | QMessageBox::No) == QMessageBox::Yes))
 690                                 remove_session(session);
 691                         break;
 692                 } else
 693                         // All other views can be closed at any time as no data will be lost
 694                         remove_view(view);
 695         }
 696 }
 697
 698 void MainWindow::on_tab_changed(int index)
 699 {
 700         shared_ptr<Session> session = get_tab_session(index);
 701
 702         if (session)
 703                 on_focused_session_changed(session);
 704 }
 705
 706 void MainWindow::on_tab_close_requested(int index)
 707 {
 708         shared_ptr<Session> session = get_tab_session(index);
 709
 710         assert(session);
 711
 712         if (session->data_saved() || (QMessageBox::question(this, tr("Confirmation"),
 713                 tr("This session contains unsaved data. Close it anyway?"),
 714                 QMessageBox::Yes | QMessageBox::No) == QMessageBox::Yes))
 715                 remove_session(session);
 716 }
 717
 718 void MainWindow::on_actionViewStickyScrolling_triggered()
 719 {
 720         shared_ptr<views::ViewBase> viewbase = get_active_view();
 721         views::TraceView::View* view =
 722                 qobject_cast<views::TraceView::View*>(viewbase.get());
 723         if (view)
 724                 view->enable_sticky_scrolling(action_view_sticky_scrolling_->isChecked());
 725 }
 726
 727 void MainWindow::on_actionViewColouredBg_triggered()
 728 {
 729         shared_ptr<views::ViewBase> viewbase = get_active_view();
 730         views::TraceView::View* view =
 731                         qobject_cast<views::TraceView::View*>(viewbase.get());
 732         if (view)
 733                 view->enable_coloured_bg(action_view_coloured_bg_->isChecked());
 734 }
 735
 736 void MainWindow::on_actionAbout_triggered()
 737 {
 738         dialogs::About dlg(device_manager_.context(), this);
 739         dlg.exec();
 740 }
 741
 742 } // namespace pv