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 #ifdef ENABLE_DECODE
  21 #include <libsigrokdecode/libsigrokdecode.h>
  22 #endif
  23
  24 #include <cassert>
  25 #include <algorithm>
  26 #include <iterator>
  27 #include <cstdint>
  28 #include <cstdarg>
  29
  30 #include <QAction>
  31 #include <QApplication>
  32 #include <QCloseEvent>
  33 #include <QDockWidget>
  34 #include <QHBoxLayout>
  35 #include <QMessageBox>
  36 #include <QSettings>
  37 #include <QWidget>
  38 #include <QShortcut>
  39
  40 #include "mainwindow.hpp"
  41
  42 #include "devicemanager.hpp"
  43 #include "globalsettings.hpp"
  44 #include "util.hpp"
  45 #include "devices/hardwaredevice.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 <libsigrokcxx/libsigrokcxx.hpp>
  52
  53 using std::dynamic_pointer_cast;
  54 using std::list;
  55 using std::make_shared;
  56 using std::map;
  57 using std::shared_ptr;
  58 using std::string;
  59
  60 namespace pv {
  61
  62 namespace view {
  63 class ViewItem;
  64 }
  65
  66 using toolbars::MainBar;
  67
  68 using std::bind;
  69 using std::placeholders::_1;
  70
  71 const QString MainWindow::WindowTitle = tr("PulseView");
  72
  73 MainWindow::MainWindow(DeviceManager &device_manager,
  74         string open_file_name, string open_file_format,
  75         QWidget *parent) :
  76         QMainWindow(parent),
  77         device_manager_(device_manager),
  78         session_selector_(this),
  79         session_state_mapper_(this),
  80         icon_red_(":/icons/status-red.svg"),
  81         icon_green_(":/icons/status-green.svg"),
  82         icon_grey_(":/icons/status-grey.svg")
  83 {
  84         qRegisterMetaType<util::Timestamp>("util::Timestamp");
  85         qRegisterMetaType<uint64_t>("uint64_t");
  86
  87         GlobalSettings::register_change_handler(GlobalSettings::Key_View_ColouredBG,
  88                 bind(&MainWindow::on_settingViewColouredBg_changed, this, _1));
  89
  90         GlobalSettings::register_change_handler(GlobalSettings::Key_View_ShowSamplingPoints,
  91                 bind(&MainWindow::on_settingViewShowSamplingPoints_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 shared_ptr<views::ViewBase> MainWindow::get_active_view() const
 129 {
 130         // If there's only one view, use it...
 131         if (view_docks_.size() == 1)
 132                 return view_docks_.begin()->second;
 133
 134         // ...otherwise find the dock widget the widget with focus is contained in
 135         QObject *w = QApplication::focusWidget();
 136         QDockWidget *dock = nullptr;
 137
 138         while (w) {
 139             dock = qobject_cast<QDockWidget*>(w);
 140             if (dock)
 141                 break;
 142             w = w->parent();
 143         }
 144
 145         // Get the view contained in the dock widget
 146         for (auto entry : view_docks_)
 147                 if (entry.first == dock)
 148                         return entry.second;
 149
 150         return nullptr;
 151 }
 152
 153 shared_ptr<views::ViewBase> MainWindow::add_view(const QString &title,
 154         views::ViewType type, Session &session)
 155 {
 156         GlobalSettings settings;
 157         shared_ptr<views::ViewBase> v;
 158
 159         QMainWindow *main_window = nullptr;
 160         for (auto entry : session_windows_)
 161                 if (entry.first.get() == &session)
 162                         main_window = entry.second;
 163
 164         assert(main_window);
 165
 166         shared_ptr<MainBar> main_bar = session.main_bar();
 167
 168         QDockWidget* dock = new QDockWidget(title, main_window);
 169         dock->setObjectName(title);
 170         main_window->addDockWidget(Qt::TopDockWidgetArea, dock);
 171
 172         // Insert a QMainWindow into the dock widget to allow for a tool bar
 173         QMainWindow *dock_main = new QMainWindow(dock);
 174         dock_main->setWindowFlags(Qt::Widget);  // Remove Qt::Window flag
 175
 176         if (type == views::ViewTypeTrace)
 177                 // This view will be the main view if there's no main bar yet
 178                 v = make_shared<views::TraceView::View>(session,
 179                         (main_bar ? false : true), dock_main);
 180
 181         if (!v)
 182                 return nullptr;
 183
 184         view_docks_[dock] = v;
 185         session.register_view(v);
 186
 187         dock_main->setCentralWidget(v.get());
 188         dock->setWidget(dock_main);
 189
 190         dock->setFeatures(QDockWidget::DockWidgetMovable |
 191                 QDockWidget::DockWidgetFloatable | QDockWidget::DockWidgetClosable);
 192
 193         QAbstractButton *close_btn =
 194                 dock->findChildren<QAbstractButton*>
 195                         ("qt_dockwidget_closebutton").front();
 196
 197         connect(close_btn, SIGNAL(clicked(bool)),
 198                 this, SLOT(on_view_close_clicked()));
 199
 200         connect(&session, SIGNAL(trigger_event(util::Timestamp)),
 201                 qobject_cast<views::ViewBase*>(v.get()),
 202                 SLOT(trigger_event(util::Timestamp)));
 203
 204         if (type == views::ViewTypeTrace) {
 205                 views::TraceView::View *tv =
 206                         qobject_cast<views::TraceView::View*>(v.get());
 207
 208                 tv->enable_coloured_bg(settings.value(GlobalSettings::Key_View_ColouredBG).toBool());
 209                 tv->enable_show_sampling_points(settings.value(GlobalSettings::Key_View_ShowSamplingPoints).toBool());
 210
 211                 if (!main_bar) {
 212                         /* Initial view, create the main bar */
 213                         main_bar = make_shared<MainBar>(session, this, tv);
 214                         dock_main->addToolBar(main_bar.get());
 215                         session.set_main_bar(main_bar);
 216
 217                         connect(main_bar.get(), SIGNAL(new_view(Session*)),
 218                                 this, SLOT(on_new_view(Session*)));
 219
 220                         main_bar->action_view_show_cursors()->setChecked(tv->cursors_shown());
 221
 222                         /* For the main view we need to prevent the dock widget from
 223                          * closing itself when its close button is clicked. This is
 224                          * so we can confirm with the user first. Regular views don't
 225                          * need this */
 226                         close_btn->disconnect(SIGNAL(clicked()), dock, SLOT(close()));
 227                 } else {
 228                         /* Additional view, create a standard bar */
 229                         pv::views::trace::StandardBar *standard_bar =
 230                                 new pv::views::trace::StandardBar(session, this, tv);
 231                         dock_main->addToolBar(standard_bar);
 232
 233                         standard_bar->action_view_show_cursors()->setChecked(tv->cursors_shown());
 234                 }
 235         }
 236
 237         return v;
 238 }
 239
 240 void MainWindow::remove_view(shared_ptr<views::ViewBase> view)
 241 {
 242         for (shared_ptr<Session> session : sessions_) {
 243                 if (!session->has_view(view))
 244                         continue;
 245
 246                 // Find the dock the view is contained in and remove it
 247                 for (auto entry : view_docks_)
 248                         if (entry.second == view) {
 249                                 // Remove the view from the session
 250                                 session->deregister_view(view);
 251
 252                                 // Remove the view from its parent; otherwise, Qt will
 253                                 // call deleteLater() on it, which causes a double free
 254                                 // since the shared_ptr in view_docks_ doesn't know
 255                                 // that Qt keeps a pointer to the view around
 256                                 view->setParent(nullptr);
 257
 258                                 // Delete the view's dock widget and all widgets inside it
 259                                 entry.first->deleteLater();
 260
 261                                 // Remove the dock widget from the list and stop iterating
 262                                 view_docks_.erase(entry.first);
 263                                 break;
 264                         }
 265         }
 266 }
 267
 268 shared_ptr<Session> MainWindow::add_session()
 269 {
 270         static int last_session_id = 1;
 271         QString name = tr("Session %1").arg(last_session_id++);
 272
 273         shared_ptr<Session> session = make_shared<Session>(device_manager_, name);
 274
 275         connect(session.get(), SIGNAL(add_view(const QString&, views::ViewType, Session*)),
 276                 this, SLOT(on_add_view(const QString&, views::ViewType, Session*)));
 277         connect(session.get(), SIGNAL(name_changed()),
 278                 this, SLOT(on_session_name_changed()));
 279         session_state_mapper_.setMapping(session.get(), session.get());
 280         connect(session.get(), SIGNAL(capture_state_changed(int)),
 281                 &session_state_mapper_, SLOT(map()));
 282
 283         sessions_.push_back(session);
 284
 285         QMainWindow *window = new QMainWindow();
 286         window->setWindowFlags(Qt::Widget);  // Remove Qt::Window flag
 287         session_windows_[session] = window;
 288
 289         int index = session_selector_.addTab(window, name);
 290         session_selector_.setCurrentIndex(index);
 291         last_focused_session_ = session;
 292
 293         window->setDockNestingEnabled(true);
 294
 295         shared_ptr<views::ViewBase> main_view =
 296                 add_view(name, views::ViewTypeTrace, *session);
 297
 298         return session;
 299 }
 300
 301 void MainWindow::remove_session(shared_ptr<Session> session)
 302 {
 303         int h = new_session_button_->height();
 304
 305         for (shared_ptr<views::ViewBase> view : session->views())
 306                 remove_view(view);
 307
 308         QMainWindow *window = session_windows_.at(session);
 309         session_selector_.removeTab(session_selector_.indexOf(window));
 310
 311         session_windows_.erase(session);
 312
 313         if (last_focused_session_ == session)
 314                 last_focused_session_.reset();
 315
 316         sessions_.remove_if([&](shared_ptr<Session> s) {
 317                 return s == session; });
 318
 319         if (sessions_.empty()) {
 320                 // When there are no more tabs, the height of the QTabWidget
 321                 // drops to zero. We must prevent this to keep the static
 322                 // widgets visible
 323                 for (QWidget *w : static_tab_widget_->findChildren<QWidget*>())
 324                         w->setMinimumHeight(h);
 325
 326                 int margin = static_tab_widget_->layout()->contentsMargins().bottom();
 327                 static_tab_widget_->setMinimumHeight(h + 2 * margin);
 328                 session_selector_.setMinimumHeight(h + 2 * margin);
 329
 330                 // Update the window title if there is no view left to
 331                 // generate focus change events
 332                 setWindowTitle(WindowTitle);
 333         }
 334 }
 335
 336 void MainWindow::setup_ui()
 337 {
 338         setObjectName(QString::fromUtf8("MainWindow"));
 339
 340         setCentralWidget(&session_selector_);
 341
 342         // Set the window icon
 343         QIcon icon;
 344         icon.addFile(QString(":/icons/sigrok-logo-notext.png"));
 345         setWindowIcon(icon);
 346
 347         view_sticky_scrolling_shortcut_ = new QShortcut(QKeySequence(Qt::Key_S), this, SLOT(on_view_sticky_scrolling_shortcut()));
 348         view_sticky_scrolling_shortcut_->setAutoRepeat(false);
 349
 350         view_show_sampling_points_shortcut_ = new QShortcut(QKeySequence(Qt::Key_Period), this, SLOT(on_view_show_sampling_points_shortcut()));
 351         view_show_sampling_points_shortcut_->setAutoRepeat(false);
 352
 353         view_coloured_bg_shortcut_ = new QShortcut(QKeySequence(Qt::Key_B), this, SLOT(on_view_coloured_bg_shortcut()));
 354         view_coloured_bg_shortcut_->setAutoRepeat(false);
 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_->setToolTip(tr("Start/Stop Acquisition"));
 367
 368         run_stop_shortcut_ = new QShortcut(QKeySequence(Qt::Key_Space), run_stop_button_, SLOT(click()));
 369         run_stop_shortcut_->setAutoRepeat(false);
 370
 371         settings_button_ = new QToolButton();
 372         settings_button_->setIcon(QIcon::fromTheme("configure",
 373                 QIcon(":/icons/configure.png")));
 374         settings_button_->setToolTip(tr("Settings"));
 375         settings_button_->setAutoRaise(true);
 376
 377         QFrame *separator1 = new QFrame();
 378         separator1->setFrameStyle(QFrame::VLine | QFrame::Raised);
 379         QFrame *separator2 = new QFrame();
 380         separator2->setFrameStyle(QFrame::VLine | QFrame::Raised);
 381
 382         QHBoxLayout* layout = new QHBoxLayout();
 383         layout->setContentsMargins(2, 2, 2, 2);
 384         layout->addWidget(new_session_button_);
 385         layout->addWidget(separator1);
 386         layout->addWidget(run_stop_button_);
 387         layout->addWidget(separator2);
 388         layout->addWidget(settings_button_);
 389
 390         static_tab_widget_ = new QWidget();
 391         static_tab_widget_->setLayout(layout);
 392
 393         session_selector_.setCornerWidget(static_tab_widget_, Qt::TopLeftCorner);
 394         session_selector_.setTabsClosable(true);
 395
 396         close_application_shortcut_ = new QShortcut(QKeySequence(Qt::CTRL + Qt::Key_Q), this, SLOT(close()));
 397         close_application_shortcut_->setAutoRepeat(false);
 398
 399         close_current_tab_shortcut_ = new QShortcut(QKeySequence(Qt::CTRL + Qt::Key_W), this, SLOT(on_close_current_tab()));
 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         connect(settings_button_, SIGNAL(clicked(bool)),
 408                 this, SLOT(on_settings_clicked()));
 409
 410         connect(&session_selector_, SIGNAL(tabCloseRequested(int)),
 411                 this, SLOT(on_tab_close_requested(int)));
 412         connect(&session_selector_, SIGNAL(currentChanged(int)),
 413                 this, SLOT(on_tab_changed(int)));
 414
 415
 416         connect(static_cast<QApplication *>(QCoreApplication::instance()),
 417                 SIGNAL(focusChanged(QWidget*, QWidget*)),
 418                 this, SLOT(on_focus_changed()));
 419 }
 420
 421 void MainWindow::save_ui_settings()
 422 {
 423         QSettings settings;
 424         int id = 0;
 425
 426         settings.beginGroup("MainWindow");
 427         settings.setValue("state", saveState());
 428         settings.setValue("geometry", saveGeometry());
 429         settings.endGroup();
 430
 431         for (shared_ptr<Session> session : sessions_) {
 432                 // Ignore sessions using the demo device or no device at all
 433                 if (session->device()) {
 434                         shared_ptr<devices::HardwareDevice> device =
 435                                 dynamic_pointer_cast< devices::HardwareDevice >
 436                                 (session->device());
 437
 438                         if (device &&
 439                                 device->hardware_device()->driver()->name() == "demo")
 440                                 continue;
 441
 442                         settings.beginGroup("Session" + QString::number(id++));
 443                         settings.remove("");  // Remove all keys in this group
 444                         session->save_settings(settings);
 445                         settings.endGroup();
 446                 }
 447         }
 448
 449         settings.setValue("sessions", id);
 450 }
 451
 452 void MainWindow::restore_ui_settings()
 453 {
 454         QSettings settings;
 455         int i, session_count;
 456
 457         settings.beginGroup("MainWindow");
 458
 459         if (settings.contains("geometry")) {
 460                 restoreGeometry(settings.value("geometry").toByteArray());
 461                 restoreState(settings.value("state").toByteArray());
 462         } else
 463                 resize(1000, 720);
 464
 465         settings.endGroup();
 466
 467         session_count = settings.value("sessions", 0).toInt();
 468
 469         for (i = 0; i < session_count; i++) {
 470                 settings.beginGroup("Session" + QString::number(i));
 471                 shared_ptr<Session> session = add_session();
 472                 session->restore_settings(settings);
 473                 settings.endGroup();
 474         }
 475 }
 476
 477 std::shared_ptr<Session> MainWindow::get_tab_session(int index) const
 478 {
 479         // Find the session that belongs to the tab's main window
 480         for (auto entry : session_windows_)
 481                 if (entry.second == session_selector_.widget(index))
 482                         return entry.first;
 483
 484         return nullptr;
 485 }
 486
 487 void MainWindow::closeEvent(QCloseEvent *event)
 488 {
 489         bool data_saved = true;
 490
 491         for (auto entry : session_windows_)
 492                 if (!entry.first->data_saved())
 493                         data_saved = false;
 494
 495         if (!data_saved && (QMessageBox::question(this, tr("Confirmation"),
 496                 tr("There is unsaved data. Close anyway?"),
 497                 QMessageBox::Yes | QMessageBox::No) == QMessageBox::No)) {
 498                 event->ignore();
 499         } else {
 500                 save_ui_settings();
 501                 event->accept();
 502         }
 503 }
 504
 505 QMenu* MainWindow::createPopupMenu()
 506 {
 507         return nullptr;
 508 }
 509
 510 bool MainWindow::restoreState(const QByteArray &state, int version)
 511 {
 512         (void)state;
 513         (void)version;
 514
 515         // Do nothing. We don't want Qt to handle this, or else it
 516         // will try to restore all the dock widgets and create havoc.
 517
 518         return false;
 519 }
 520
 521 void MainWindow::session_error(const QString text, const QString info_text)
 522 {
 523         QMetaObject::invokeMethod(this, "show_session_error",
 524                 Qt::QueuedConnection, Q_ARG(QString, text),
 525                 Q_ARG(QString, info_text));
 526 }
 527
 528 void MainWindow::show_session_error(const QString text, const QString info_text)
 529 {
 530         QMessageBox msg(this);
 531         msg.setText(text);
 532         msg.setInformativeText(info_text);
 533         msg.setStandardButtons(QMessageBox::Ok);
 534         msg.setIcon(QMessageBox::Warning);
 535         msg.exec();
 536 }
 537
 538 void MainWindow::on_add_view(const QString &title, views::ViewType type,
 539         Session *session)
 540 {
 541         // We get a pointer and need a reference
 542         for (std::shared_ptr<Session> s : sessions_)
 543                 if (s.get() == session)
 544                         add_view(title, type, *s);
 545 }
 546
 547 void MainWindow::on_focus_changed()
 548 {
 549         shared_ptr<views::ViewBase> view = get_active_view();
 550
 551         if (view) {
 552                 for (shared_ptr<Session> session : sessions_) {
 553                         if (session->has_view(view)) {
 554                                 if (session != last_focused_session_) {
 555                                         // Activate correct tab if necessary
 556                                         shared_ptr<Session> tab_session = get_tab_session(
 557                                                 session_selector_.currentIndex());
 558                                         if (tab_session != session)
 559                                                 session_selector_.setCurrentWidget(
 560                                                         session_windows_.at(session));
 561
 562                                         on_focused_session_changed(session);
 563                                 }
 564
 565                                 break;
 566                         }
 567                 }
 568         }
 569
 570         if (sessions_.empty())
 571                 setWindowTitle(WindowTitle);
 572 }
 573
 574 void MainWindow::on_focused_session_changed(shared_ptr<Session> session)
 575 {
 576         last_focused_session_ = session;
 577
 578         setWindowTitle(session->name() + " - " + WindowTitle);
 579
 580         // Update the state of the run/stop button, too
 581         on_capture_state_changed(session.get());
 582 }
 583
 584 void MainWindow::on_new_session_clicked()
 585 {
 586         add_session();
 587 }
 588
 589 void MainWindow::on_run_stop_clicked()
 590 {
 591         shared_ptr<Session> session = last_focused_session_;
 592
 593         if (!session)
 594                 return;
 595
 596         switch (session->get_capture_state()) {
 597         case Session::Stopped:
 598                 session->start_capture([&](QString message) {
 599                         session_error("Capture failed", message); });
 600                 break;
 601         case Session::AwaitingTrigger:
 602         case Session::Running:
 603                 session->stop_capture();
 604                 break;
 605         }
 606 }
 607
 608 void MainWindow::on_settings_clicked()
 609 {
 610         dialogs::Settings dlg(device_manager_);
 611         dlg.exec();
 612 }
 613
 614 void MainWindow::on_session_name_changed()
 615 {
 616         // Update the corresponding dock widget's name(s)
 617         Session *session = qobject_cast<Session*>(QObject::sender());
 618         assert(session);
 619
 620         for (shared_ptr<views::ViewBase> view : session->views()) {
 621                 // Get the dock that contains the view
 622                 for (auto entry : view_docks_)
 623                         if (entry.second == view) {
 624                                 entry.first->setObjectName(session->name());
 625                                 entry.first->setWindowTitle(session->name());
 626                         }
 627         }
 628
 629         // Update the tab widget by finding the main window and the tab from that
 630         for (auto entry : session_windows_)
 631                 if (entry.first.get() == session) {
 632                         QMainWindow *window = entry.second;
 633                         const int index = session_selector_.indexOf(window);
 634                         session_selector_.setTabText(index, session->name());
 635                 }
 636
 637         // Refresh window title if the affected session has focus
 638         if (session == last_focused_session_.get())
 639                 setWindowTitle(session->name() + " - " + WindowTitle);
 640 }
 641
 642 void MainWindow::on_capture_state_changed(QObject *obj)
 643 {
 644         Session *caller = qobject_cast<Session*>(obj);
 645
 646         // Ignore if caller is not the currently focused session
 647         // unless there is only one session
 648         if ((sessions_.size() > 1) && (caller != last_focused_session_.get()))
 649                 return;
 650
 651         int state = caller->get_capture_state();
 652
 653         const QIcon *icons[] = {&icon_grey_, &icon_red_, &icon_green_};
 654         run_stop_button_->setIcon(*icons[state]);
 655         run_stop_button_->setText((state == pv::Session::Stopped) ?
 656                 tr("Run") : tr("Stop"));
 657 }
 658
 659 void MainWindow::on_new_view(Session *session)
 660 {
 661         // We get a pointer and need a reference
 662         for (std::shared_ptr<Session> s : sessions_)
 663                 if (s.get() == session)
 664                         add_view(session->name(), views::ViewTypeTrace, *s);
 665 }
 666
 667 void MainWindow::on_view_close_clicked()
 668 {
 669         // Find the dock widget that contains the close button that was clicked
 670         QObject *w = QObject::sender();
 671         QDockWidget *dock = nullptr;
 672
 673         while (w) {
 674             dock = qobject_cast<QDockWidget*>(w);
 675             if (dock)
 676                 break;
 677             w = w->parent();
 678         }
 679
 680         // Get the view contained in the dock widget
 681         shared_ptr<views::ViewBase> view;
 682
 683         for (auto entry : view_docks_)
 684                 if (entry.first == dock)
 685                         view = entry.second;
 686
 687         // Deregister the view
 688         for (shared_ptr<Session> session : sessions_) {
 689                 if (!session->has_view(view))
 690                         continue;
 691
 692                 // Also destroy the entire session if its main view is closing...
 693                 if (view == session->main_view()) {
 694                         // ...but only if data is saved or the user confirms closing
 695                         if (session->data_saved() || (QMessageBox::question(this, tr("Confirmation"),
 696                                 tr("This session contains unsaved data. Close it anyway?"),
 697                                 QMessageBox::Yes | QMessageBox::No) == QMessageBox::Yes))
 698                                 remove_session(session);
 699                         break;
 700                 } else
 701                         // All other views can be closed at any time as no data will be lost
 702                         remove_view(view);
 703         }
 704 }
 705
 706 void MainWindow::on_tab_changed(int index)
 707 {
 708         shared_ptr<Session> session = get_tab_session(index);
 709
 710         if (session)
 711                 on_focused_session_changed(session);
 712 }
 713
 714 void MainWindow::on_tab_close_requested(int index)
 715 {
 716         shared_ptr<Session> session = get_tab_session(index);
 717
 718         assert(session);
 719
 720         if (session->data_saved() || (QMessageBox::question(this, tr("Confirmation"),
 721                 tr("This session contains unsaved data. Close it anyway?"),
 722                 QMessageBox::Yes | QMessageBox::No) == QMessageBox::Yes))
 723                 remove_session(session);
 724 }
 725
 726 void MainWindow::on_view_coloured_bg_shortcut()
 727 {
 728         GlobalSettings settings;
 729
 730         bool state = settings.value(GlobalSettings::Key_View_ColouredBG).toBool();
 731         settings.setValue(GlobalSettings::Key_View_ColouredBG, !state);
 732 }
 733
 734 void MainWindow::on_view_sticky_scrolling_shortcut()
 735 {
 736         GlobalSettings settings;
 737
 738         bool state = settings.value(GlobalSettings::Key_View_StickyScrolling).toBool();
 739         settings.setValue(GlobalSettings::Key_View_StickyScrolling, !state);
 740 }
 741
 742 void MainWindow::on_view_show_sampling_points_shortcut()
 743 {
 744         GlobalSettings settings;
 745
 746         bool state = settings.value(GlobalSettings::Key_View_ShowSamplingPoints).toBool();
 747         settings.setValue(GlobalSettings::Key_View_ShowSamplingPoints, !state);
 748 }
 749
 750 void MainWindow::on_settingViewColouredBg_changed(const QVariant new_value)
 751 {
 752         bool state = new_value.toBool();
 753
 754         for (auto entry : view_docks_) {
 755                 shared_ptr<views::ViewBase> viewbase = entry.second;
 756
 757                 // Only trace views have this setting
 758                 views::TraceView::View* view =
 759                                 qobject_cast<views::TraceView::View*>(viewbase.get());
 760                 if (view)
 761                         view->enable_coloured_bg(state);
 762         }
 763 }
 764
 765 void MainWindow::on_settingViewShowSamplingPoints_changed(const QVariant new_value)
 766 {
 767         bool state = new_value.toBool();
 768
 769         for (auto entry : view_docks_) {
 770                 shared_ptr<views::ViewBase> viewbase = entry.second;
 771
 772                 // Only trace views have this setting
 773                 views::TraceView::View* view =
 774                                 qobject_cast<views::TraceView::View*>(viewbase.get());
 775                 if (view)
 776                         view->enable_show_sampling_points(state);
 777         }
 778 }
 779
 780 void MainWindow::on_close_current_tab()
 781 {
 782         int tab = session_selector_.currentIndex();
 783
 784         on_tab_close_requested(tab);
 785 }
 786
 787 } // namespace pv