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 #include <QShortcut>
  38
  39 #include "mainwindow.hpp"
  40
  41 #include "devicemanager.hpp"
  42 #include "globalsettings.hpp"
  43 #include "util.hpp"
  44 #include "devices/hardwaredevice.hpp"
  45 #include "dialogs/about.hpp"
  46 #include "dialogs/settings.hpp"
  47 #include "toolbars/mainbar.hpp"
  48 #include "view/view.hpp"
  49 #include "views/trace/standardbar.hpp"
  50
  51 #include <stdint.h>
  52 #include <stdarg.h>
  53 #include <libsigrokcxx/libsigrokcxx.hpp>
  54
  55 using std::dynamic_pointer_cast;
  56 using std::list;
  57 using std::make_shared;
  58 using std::map;
  59 using std::shared_ptr;
  60 using std::string;
  61
  62 namespace pv {
  63
  64 namespace view {
  65 class ViewItem;
  66 }
  67
  68 using toolbars::MainBar;
  69
  70 using std::bind;
  71 using std::placeholders::_1;
  72
  73 const QString MainWindow::WindowTitle = tr("PulseView");
  74
  75 MainWindow::MainWindow(DeviceManager &device_manager,
  76         string open_file_name, string open_file_format,
  77         QWidget *parent) :
  78         QMainWindow(parent),
  79         device_manager_(device_manager),
  80         session_selector_(this),
  81         session_state_mapper_(this),
  82         action_about_(new QAction(this)),
  83         icon_red_(":/icons/status-red.svg"),
  84         icon_green_(":/icons/status-green.svg"),
  85         icon_grey_(":/icons/status-grey.svg")
  86 {
  87         qRegisterMetaType<util::Timestamp>("util::Timestamp");
  88         qRegisterMetaType<uint64_t>("uint64_t");
  89
  90         GlobalSettings::register_change_handler(GlobalSettings::Key_View_ColouredBG,
  91                 bind(&MainWindow::on_settingViewColouredBg_changed, this, _1));
  92
  93         setup_ui();
  94         restore_ui_settings();
  95
  96         if (!open_file_name.empty()) {
  97                 shared_ptr<Session> session = add_session();
  98                 session->load_init_file(open_file_name, open_file_format);
  99         }
 100
 101         // Add empty default session if there aren't any sessions
 102         if (sessions_.size() == 0) {
 103                 shared_ptr<Session> session = add_session();
 104
 105                 map<string, string> dev_info;
 106                 shared_ptr<devices::HardwareDevice> other_device, demo_device;
 107
 108                 // Use any available device that's not demo
 109                 for (shared_ptr<devices::HardwareDevice> dev : device_manager_.devices()) {
 110                         if (dev->hardware_device()->driver()->name() == "demo") {
 111                                 demo_device = dev;
 112                         } else {
 113                                 other_device = dev;
 114                         }
 115                 }
 116
 117                 // ...and if there isn't any, just use demo then
 118                 session->select_device(other_device ? other_device : demo_device);
 119         }
 120 }
 121
 122 MainWindow::~MainWindow()
 123 {
 124         while (!sessions_.empty())
 125                 remove_session(sessions_.front());
 126 }
 127
 128 QAction* MainWindow::action_about() const
 129 {
 130         return action_about_;
 131 }
 132
 133 shared_ptr<views::ViewBase> MainWindow::get_active_view() const
 134 {
 135         // If there's only one view, use it...
 136         if (view_docks_.size() == 1)
 137                 return view_docks_.begin()->second;
 138
 139         // ...otherwise find the dock widget the widget with focus is contained in
 140         QObject *w = QApplication::focusWidget();
 141         QDockWidget *dock = 0;
 142
 143         while (w) {
 144             dock = qobject_cast<QDockWidget*>(w);
 145             if (dock)
 146                 break;
 147             w = w->parent();
 148         }
 149
 150         // Get the view contained in the dock widget
 151         for (auto entry : view_docks_)
 152                 if (entry.first == dock)
 153                         return entry.second;
 154
 155         return nullptr;
 156 }
 157
 158 shared_ptr<views::ViewBase> MainWindow::add_view(const QString &title,
 159         views::ViewType type, Session &session)
 160 {
 161         GlobalSettings settings;
 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(true);
 203                         v->enable_coloured_bg(settings.value(GlobalSettings::Key_View_ColouredBG).toBool());
 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
 217                                 /* For the main view we need to prevent the dock widget from
 218                                  * closing itself when its close button is clicked. This is
 219                                  * so we can confirm with the user first. Regular views don't
 220                                  * need this */
 221                                 close_btn->disconnect(SIGNAL(clicked()), dock, SLOT(close()));
 222                         } else {
 223                                 /* Additional view, create a standard bar */
 224                                 pv::views::trace::StandardBar *standard_bar =
 225                                         new pv::views::trace::StandardBar(session, this, v.get());
 226                                 dock_main->addToolBar(standard_bar);
 227
 228                                 standard_bar->action_view_show_cursors()->setChecked(v->cursors_shown());
 229                         }
 230                 }
 231
 232                 return v;
 233         }
 234
 235         return nullptr;
 236 }
 237
 238 void MainWindow::remove_view(shared_ptr<views::ViewBase> view)
 239 {
 240         for (shared_ptr<Session> session : sessions_) {
 241                 if (!session->has_view(view))
 242                         continue;
 243
 244                 // Find the dock the view is contained in and remove it
 245                 for (auto entry : view_docks_)
 246                         if (entry.second == view) {
 247                                 // Remove the view from the session
 248                                 session->deregister_view(view);
 249
 250                                 // Remove the view from its parent; otherwise, Qt will
 251                                 // call deleteLater() on it, which causes a double free
 252                                 // since the shared_ptr in view_docks_ doesn't know
 253                                 // that Qt keeps a pointer to the view around
 254                                 view->setParent(0);
 255
 256                                 // Delete the view's dock widget and all widgets inside it
 257                                 entry.first->deleteLater();
 258
 259                                 // Remove the dock widget from the list and stop iterating
 260                                 view_docks_.erase(entry.first);
 261                                 break;
 262                         }
 263         }
 264 }
 265
 266 shared_ptr<Session> MainWindow::add_session()
 267 {
 268         static int last_session_id = 1;
 269         QString name = tr("Session %1").arg(last_session_id++);
 270
 271         shared_ptr<Session> session = make_shared<Session>(device_manager_, name);
 272
 273         connect(session.get(), SIGNAL(add_view(const QString&, views::ViewType, Session*)),
 274                 this, SLOT(on_add_view(const QString&, views::ViewType, Session*)));
 275         connect(session.get(), SIGNAL(name_changed()),
 276                 this, SLOT(on_session_name_changed()));
 277         session_state_mapper_.setMapping(session.get(), session.get());
 278         connect(session.get(), SIGNAL(capture_state_changed(int)),
 279                 &session_state_mapper_, SLOT(map()));
 280
 281         sessions_.push_back(session);
 282
 283         QMainWindow *window = new QMainWindow();
 284         window->setWindowFlags(Qt::Widget);  // Remove Qt::Window flag
 285         session_windows_[session] = window;
 286
 287         int index = session_selector_.addTab(window, name);
 288         session_selector_.setCurrentIndex(index);
 289         last_focused_session_ = session;
 290
 291         window->setDockNestingEnabled(true);
 292
 293         shared_ptr<views::ViewBase> main_view =
 294                 add_view(name, views::ViewTypeTrace, *session);
 295
 296         return session;
 297 }
 298
 299 void MainWindow::remove_session(shared_ptr<Session> session)
 300 {
 301         int h = new_session_button_->height();
 302
 303         for (shared_ptr<views::ViewBase> view : session->views())
 304                 remove_view(view);
 305
 306         QMainWindow *window = session_windows_.at(session);
 307         session_selector_.removeTab(session_selector_.indexOf(window));
 308
 309         session_windows_.erase(session);
 310
 311         if (last_focused_session_ == session)
 312                 last_focused_session_.reset();
 313
 314         sessions_.remove_if([&](shared_ptr<Session> s) {
 315                 return s == session; });
 316
 317         if (sessions_.empty()) {
 318                 // When there are no more tabs, the height of the QTabWidget
 319                 // drops to zero. We must prevent this to keep the static
 320                 // widgets visible
 321                 for (QWidget *w : static_tab_widget_->findChildren<QWidget*>())
 322                         w->setMinimumHeight(h);
 323
 324                 int margin = static_tab_widget_->layout()->contentsMargins().bottom();
 325                 static_tab_widget_->setMinimumHeight(h + 2 * margin);
 326                 session_selector_.setMinimumHeight(h + 2 * margin);
 327
 328                 // Update the window title if there is no view left to
 329                 // generate focus change events
 330                 setWindowTitle(WindowTitle);
 331         }
 332 }
 333
 334 void MainWindow::setup_ui()
 335 {
 336         setObjectName(QString::fromUtf8("MainWindow"));
 337
 338         setCentralWidget(&session_selector_);
 339
 340         // Set the window icon
 341         QIcon icon;
 342         icon.addFile(QString(":/icons/sigrok-logo-notext.png"));
 343         setWindowIcon(icon);
 344
 345         view_sticky_scrolling_shortcut_ = new QShortcut(QKeySequence(Qt::Key_S), this, SLOT(on_view_sticky_scrolling_shortcut()));
 346         view_sticky_scrolling_shortcut_->setAutoRepeat(false);
 347
 348         view_coloured_bg_shortcut_ = new QShortcut(QKeySequence(Qt::Key_B), this, SLOT(on_view_coloured_bg_shortcut()));
 349         view_coloured_bg_shortcut_->setAutoRepeat(false);
 350
 351         action_about_->setObjectName(QString::fromUtf8("actionAbout"));
 352         action_about_->setToolTip(tr("&About..."));
 353
 354         // Set up the tab area
 355         new_session_button_ = new QToolButton();
 356         new_session_button_->setIcon(QIcon::fromTheme("document-new",
 357                 QIcon(":/icons/document-new.png")));
 358         new_session_button_->setToolTip(tr("Create New Session"));
 359         new_session_button_->setAutoRaise(true);
 360
 361         run_stop_button_ = new QToolButton();
 362         run_stop_button_->setAutoRaise(true);
 363         run_stop_button_->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
 364         run_stop_button_->setToolTip(tr("Start/Stop Acquisition"));
 365
 366         run_stop_shortcut_ = new QShortcut(QKeySequence(Qt::Key_Space), run_stop_button_, SLOT(click()));
 367         run_stop_shortcut_->setAutoRepeat(false);
 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         close_application_shortcut_ = new QShortcut(QKeySequence(Qt::CTRL + Qt::Key_Q), this, SLOT(close()));
 395         close_application_shortcut_->setAutoRepeat(false);
 396
 397         close_current_tab_shortcut_ = new QShortcut(QKeySequence(Qt::CTRL + Qt::Key_W), this, SLOT(on_close_current_tab()));
 398
 399         connect(new_session_button_, SIGNAL(clicked(bool)),
 400                 this, SLOT(on_new_session_clicked()));
 401         connect(run_stop_button_, SIGNAL(clicked(bool)),
 402                 this, SLOT(on_run_stop_clicked()));
 403         connect(&session_state_mapper_, SIGNAL(mapped(QObject*)),
 404                 this, SLOT(on_capture_state_changed(QObject*)));
 405         connect(settings_button_, SIGNAL(clicked(bool)),
 406                 this, SLOT(on_settings_clicked()));
 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_settings_clicked()
 607 {
 608         dialogs::Settings dlg;
 609         dlg.exec();
 610 }
 611
 612 void MainWindow::on_session_name_changed()
 613 {
 614         // Update the corresponding dock widget's name(s)
 615         Session *session = qobject_cast<Session*>(QObject::sender());
 616         assert(session);
 617
 618         for (shared_ptr<views::ViewBase> view : session->views()) {
 619                 // Get the dock that contains the view
 620                 for (auto entry : view_docks_)
 621                         if (entry.second == view) {
 622                                 entry.first->setObjectName(session->name());
 623                                 entry.first->setWindowTitle(session->name());
 624                         }
 625         }
 626
 627         // Update the tab widget by finding the main window and the tab from that
 628         for (auto entry : session_windows_)
 629                 if (entry.first.get() == session) {
 630                         QMainWindow *window = entry.second;
 631                         const int index = session_selector_.indexOf(window);
 632                         session_selector_.setTabText(index, session->name());
 633                 }
 634
 635         // Refresh window title if the affected session has focus
 636         if (session == last_focused_session_.get())
 637                 setWindowTitle(session->name() + " - " + WindowTitle);
 638 }
 639
 640 void MainWindow::on_capture_state_changed(QObject *obj)
 641 {
 642         Session *caller = qobject_cast<Session*>(obj);
 643
 644         // Ignore if caller is not the currently focused session
 645         // unless there is only one session
 646         if ((sessions_.size() > 1) && (caller != last_focused_session_.get()))
 647                 return;
 648
 649         int state = caller->get_capture_state();
 650
 651         const QIcon *icons[] = {&icon_grey_, &icon_red_, &icon_green_};
 652         run_stop_button_->setIcon(*icons[state]);
 653         run_stop_button_->setText((state == pv::Session::Stopped) ?
 654                 tr("Run") : tr("Stop"));
 655 }
 656
 657 void MainWindow::on_new_view(Session *session)
 658 {
 659         // We get a pointer and need a reference
 660         for (std::shared_ptr<Session> s : sessions_)
 661                 if (s.get() == session)
 662                         add_view(session->name(), views::ViewTypeTrace, *s);
 663 }
 664
 665 void MainWindow::on_view_close_clicked()
 666 {
 667         // Find the dock widget that contains the close button that was clicked
 668         QObject *w = QObject::sender();
 669         QDockWidget *dock = 0;
 670
 671         while (w) {
 672             dock = qobject_cast<QDockWidget*>(w);
 673             if (dock)
 674                 break;
 675             w = w->parent();
 676         }
 677
 678         // Get the view contained in the dock widget
 679         shared_ptr<views::ViewBase> view;
 680
 681         for (auto entry : view_docks_)
 682                 if (entry.first == dock)
 683                         view = entry.second;
 684
 685         // Deregister the view
 686         for (shared_ptr<Session> session : sessions_) {
 687                 if (!session->has_view(view))
 688                         continue;
 689
 690                 // Also destroy the entire session if its main view is closing...
 691                 if (view == session->main_view()) {
 692                         // ...but only if data is saved or the user confirms closing
 693                         if (session->data_saved() || (QMessageBox::question(this, tr("Confirmation"),
 694                                 tr("This session contains unsaved data. Close it anyway?"),
 695                                 QMessageBox::Yes | QMessageBox::No) == QMessageBox::Yes))
 696                                 remove_session(session);
 697                         break;
 698                 } else
 699                         // All other views can be closed at any time as no data will be lost
 700                         remove_view(view);
 701         }
 702 }
 703
 704 void MainWindow::on_tab_changed(int index)
 705 {
 706         shared_ptr<Session> session = get_tab_session(index);
 707
 708         if (session)
 709                 on_focused_session_changed(session);
 710 }
 711
 712 void MainWindow::on_tab_close_requested(int index)
 713 {
 714         shared_ptr<Session> session = get_tab_session(index);
 715
 716         assert(session);
 717
 718         if (session->data_saved() || (QMessageBox::question(this, tr("Confirmation"),
 719                 tr("This session contains unsaved data. Close it anyway?"),
 720                 QMessageBox::Yes | QMessageBox::No) == QMessageBox::Yes))
 721                 remove_session(session);
 722 }
 723
 724 void MainWindow::on_view_sticky_scrolling_shortcut()
 725 {
 726         shared_ptr<views::ViewBase> viewbase = get_active_view();
 727         views::TraceView::View* view =
 728                 qobject_cast<views::TraceView::View*>(viewbase.get());
 729         if (view)
 730                 view->toggle_sticky_scrolling();
 731 }
 732
 733 void MainWindow::on_view_coloured_bg_shortcut()
 734 {
 735         GlobalSettings settings;
 736
 737         bool state = settings.value(GlobalSettings::Key_View_ColouredBG).toBool();
 738         settings.setValue(GlobalSettings::Key_View_ColouredBG, !state);
 739 }
 740
 741 void MainWindow::on_settingViewColouredBg_changed(const QVariant new_value)
 742 {
 743         bool state = new_value.toBool();
 744
 745         for (auto entry : view_docks_) {
 746                 shared_ptr<views::ViewBase> viewbase = entry.second;
 747
 748                 // Only trace views have this setting
 749                 views::TraceView::View* view =
 750                                 qobject_cast<views::TraceView::View*>(viewbase.get());
 751                 if (view)
 752                         view->enable_coloured_bg(state);
 753         }
 754 }
 755
 756 void MainWindow::on_actionAbout_triggered()
 757 {
 758         dialogs::About dlg(device_manager_.context(), this);
 759         dlg.exec();
 760 }
 761
 762 void MainWindow::on_close_current_tab()
 763 {
 764         int tab = session_selector_.currentIndex();
 765
 766         on_tab_close_requested(tab);
 767 }
 768
 769 } // namespace pv