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         setup_ui();
  91         restore_ui_settings();
  92
  93         if (!open_file_name.empty()) {
  94                 shared_ptr<Session> session = add_session();
  95                 session->load_init_file(open_file_name, open_file_format);
  96         }
  97
  98         // Add empty default session if there aren't any sessions
  99         if (sessions_.size() == 0) {
 100                 shared_ptr<Session> session = add_session();
 101
 102                 map<string, string> dev_info;
 103                 shared_ptr<devices::HardwareDevice> other_device, demo_device;
 104
 105                 // Use any available device that's not demo
 106                 for (shared_ptr<devices::HardwareDevice> dev : device_manager_.devices()) {
 107                         if (dev->hardware_device()->driver()->name() == "demo") {
 108                                 demo_device = dev;
 109                         } else {
 110                                 other_device = dev;
 111                         }
 112                 }
 113
 114                 // ...and if there isn't any, just use demo then
 115                 session->select_device(other_device ? other_device : demo_device);
 116         }
 117 }
 118
 119 MainWindow::~MainWindow()
 120 {
 121         while (!sessions_.empty())
 122                 remove_session(sessions_.front());
 123 }
 124
 125 shared_ptr<views::ViewBase> MainWindow::get_active_view() const
 126 {
 127         // If there's only one view, use it...
 128         if (view_docks_.size() == 1)
 129                 return view_docks_.begin()->second;
 130
 131         // ...otherwise find the dock widget the widget with focus is contained in
 132         QObject *w = QApplication::focusWidget();
 133         QDockWidget *dock = nullptr;
 134
 135         while (w) {
 136             dock = qobject_cast<QDockWidget*>(w);
 137             if (dock)
 138                 break;
 139             w = w->parent();
 140         }
 141
 142         // Get the view contained in the dock widget
 143         for (auto entry : view_docks_)
 144                 if (entry.first == dock)
 145                         return entry.second;
 146
 147         return nullptr;
 148 }
 149
 150 shared_ptr<views::ViewBase> MainWindow::add_view(const QString &title,
 151         views::ViewType type, Session &session)
 152 {
 153         GlobalSettings settings;
 154         shared_ptr<views::ViewBase> v;
 155
 156         QMainWindow *main_window = nullptr;
 157         for (auto entry : session_windows_)
 158                 if (entry.first.get() == &session)
 159                         main_window = entry.second;
 160
 161         assert(main_window);
 162
 163         shared_ptr<MainBar> main_bar = session.main_bar();
 164
 165         QDockWidget* dock = new QDockWidget(title, main_window);
 166         dock->setObjectName(title);
 167         main_window->addDockWidget(Qt::TopDockWidgetArea, dock);
 168
 169         // Insert a QMainWindow into the dock widget to allow for a tool bar
 170         QMainWindow *dock_main = new QMainWindow(dock);
 171         dock_main->setWindowFlags(Qt::Widget);  // Remove Qt::Window flag
 172
 173         if (type == views::ViewTypeTrace)
 174                 // This view will be the main view if there's no main bar yet
 175                 v = make_shared<views::TraceView::View>(session,
 176                         (main_bar ? false : true), dock_main);
 177
 178         if (!v)
 179                 return nullptr;
 180
 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         connect(&session, SIGNAL(trigger_event(util::Timestamp)),
 198                 qobject_cast<views::ViewBase*>(v.get()),
 199                 SLOT(trigger_event(util::Timestamp)));
 200
 201         if (type == views::ViewTypeTrace) {
 202                 views::TraceView::View *tv =
 203                         qobject_cast<views::TraceView::View*>(v.get());
 204
 205                 tv->enable_coloured_bg(settings.value(GlobalSettings::Key_View_ColouredBG).toBool());
 206
 207                 if (!main_bar) {
 208                         /* Initial view, create the main bar */
 209                         main_bar = make_shared<MainBar>(session, this, tv);
 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(tv->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, tv);
 227                         dock_main->addToolBar(standard_bar);
 228
 229                         standard_bar->action_view_show_cursors()->setChecked(tv->cursors_shown());
 230                 }
 231         }
 232
 233         return v;
 234 }
 235
 236 void MainWindow::remove_view(shared_ptr<views::ViewBase> view)
 237 {
 238         for (shared_ptr<Session> session : sessions_) {
 239                 if (!session->has_view(view))
 240                         continue;
 241
 242                 // Find the dock the view is contained in and remove it
 243                 for (auto entry : view_docks_)
 244                         if (entry.second == view) {
 245                                 // Remove the view from the session
 246                                 session->deregister_view(view);
 247
 248                                 // Remove the view from its parent; otherwise, Qt will
 249                                 // call deleteLater() on it, which causes a double free
 250                                 // since the shared_ptr in view_docks_ doesn't know
 251                                 // that Qt keeps a pointer to the view around
 252                                 view->setParent(nullptr);
 253
 254                                 // Delete the view's dock widget and all widgets inside it
 255                                 entry.first->deleteLater();
 256
 257                                 // Remove the dock widget from the list and stop iterating
 258                                 view_docks_.erase(entry.first);
 259                                 break;
 260                         }
 261         }
 262 }
 263
 264 shared_ptr<Session> MainWindow::add_session()
 265 {
 266         static int last_session_id = 1;
 267         QString name = tr("Session %1").arg(last_session_id++);
 268
 269         shared_ptr<Session> session = make_shared<Session>(device_manager_, name);
 270
 271         connect(session.get(), SIGNAL(add_view(const QString&, views::ViewType, Session*)),
 272                 this, SLOT(on_add_view(const QString&, views::ViewType, Session*)));
 273         connect(session.get(), SIGNAL(name_changed()),
 274                 this, SLOT(on_session_name_changed()));
 275         session_state_mapper_.setMapping(session.get(), session.get());
 276         connect(session.get(), SIGNAL(capture_state_changed(int)),
 277                 &session_state_mapper_, SLOT(map()));
 278
 279         sessions_.push_back(session);
 280
 281         QMainWindow *window = new QMainWindow();
 282         window->setWindowFlags(Qt::Widget);  // Remove Qt::Window flag
 283         session_windows_[session] = window;
 284
 285         int index = session_selector_.addTab(window, name);
 286         session_selector_.setCurrentIndex(index);
 287         last_focused_session_ = session;
 288
 289         window->setDockNestingEnabled(true);
 290
 291         shared_ptr<views::ViewBase> main_view =
 292                 add_view(name, views::ViewTypeTrace, *session);
 293
 294         return session;
 295 }
 296
 297 void MainWindow::remove_session(shared_ptr<Session> session)
 298 {
 299         int h = new_session_button_->height();
 300
 301         for (shared_ptr<views::ViewBase> view : session->views())
 302                 remove_view(view);
 303
 304         QMainWindow *window = session_windows_.at(session);
 305         session_selector_.removeTab(session_selector_.indexOf(window));
 306
 307         session_windows_.erase(session);
 308
 309         if (last_focused_session_ == session)
 310                 last_focused_session_.reset();
 311
 312         sessions_.remove_if([&](shared_ptr<Session> s) {
 313                 return s == session; });
 314
 315         if (sessions_.empty()) {
 316                 // When there are no more tabs, the height of the QTabWidget
 317                 // drops to zero. We must prevent this to keep the static
 318                 // widgets visible
 319                 for (QWidget *w : static_tab_widget_->findChildren<QWidget*>())
 320                         w->setMinimumHeight(h);
 321
 322                 int margin = static_tab_widget_->layout()->contentsMargins().bottom();
 323                 static_tab_widget_->setMinimumHeight(h + 2 * margin);
 324                 session_selector_.setMinimumHeight(h + 2 * margin);
 325
 326                 // Update the window title if there is no view left to
 327                 // generate focus change events
 328                 setWindowTitle(WindowTitle);
 329         }
 330 }
 331
 332 void MainWindow::setup_ui()
 333 {
 334         setObjectName(QString::fromUtf8("MainWindow"));
 335
 336         setCentralWidget(&session_selector_);
 337
 338         // Set the window icon
 339         QIcon icon;
 340         icon.addFile(QString(":/icons/sigrok-logo-notext.png"));
 341         setWindowIcon(icon);
 342
 343         view_sticky_scrolling_shortcut_ = new QShortcut(QKeySequence(Qt::Key_S), this, SLOT(on_view_sticky_scrolling_shortcut()));
 344         view_sticky_scrolling_shortcut_->setAutoRepeat(false);
 345
 346         view_coloured_bg_shortcut_ = new QShortcut(QKeySequence(Qt::Key_B), this, SLOT(on_view_coloured_bg_shortcut()));
 347         view_coloured_bg_shortcut_->setAutoRepeat(false);
 348
 349         // Set up the tab area
 350         new_session_button_ = new QToolButton();
 351         new_session_button_->setIcon(QIcon::fromTheme("document-new",
 352                 QIcon(":/icons/document-new.png")));
 353         new_session_button_->setToolTip(tr("Create New Session"));
 354         new_session_button_->setAutoRaise(true);
 355
 356         run_stop_button_ = new QToolButton();
 357         run_stop_button_->setAutoRaise(true);
 358         run_stop_button_->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
 359         run_stop_button_->setToolTip(tr("Start/Stop Acquisition"));
 360
 361         run_stop_shortcut_ = new QShortcut(QKeySequence(Qt::Key_Space), run_stop_button_, SLOT(click()));
 362         run_stop_shortcut_->setAutoRepeat(false);
 363
 364         settings_button_ = new QToolButton();
 365         settings_button_->setIcon(QIcon::fromTheme("configure",
 366                 QIcon(":/icons/configure.png")));
 367         settings_button_->setToolTip(tr("Settings"));
 368         settings_button_->setAutoRaise(true);
 369
 370         QFrame *separator1 = new QFrame();
 371         separator1->setFrameStyle(QFrame::VLine | QFrame::Raised);
 372         QFrame *separator2 = new QFrame();
 373         separator2->setFrameStyle(QFrame::VLine | QFrame::Raised);
 374
 375         QHBoxLayout* layout = new QHBoxLayout();
 376         layout->setContentsMargins(2, 2, 2, 2);
 377         layout->addWidget(new_session_button_);
 378         layout->addWidget(separator1);
 379         layout->addWidget(run_stop_button_);
 380         layout->addWidget(separator2);
 381         layout->addWidget(settings_button_);
 382
 383         static_tab_widget_ = new QWidget();
 384         static_tab_widget_->setLayout(layout);
 385
 386         session_selector_.setCornerWidget(static_tab_widget_, Qt::TopLeftCorner);
 387         session_selector_.setTabsClosable(true);
 388
 389         close_application_shortcut_ = new QShortcut(QKeySequence(Qt::CTRL + Qt::Key_Q), this, SLOT(close()));
 390         close_application_shortcut_->setAutoRepeat(false);
 391
 392         close_current_tab_shortcut_ = new QShortcut(QKeySequence(Qt::CTRL + Qt::Key_W), this, SLOT(on_close_current_tab()));
 393
 394         connect(new_session_button_, SIGNAL(clicked(bool)),
 395                 this, SLOT(on_new_session_clicked()));
 396         connect(run_stop_button_, SIGNAL(clicked(bool)),
 397                 this, SLOT(on_run_stop_clicked()));
 398         connect(&session_state_mapper_, SIGNAL(mapped(QObject*)),
 399                 this, SLOT(on_capture_state_changed(QObject*)));
 400         connect(settings_button_, SIGNAL(clicked(bool)),
 401                 this, SLOT(on_settings_clicked()));
 402
 403         connect(&session_selector_, SIGNAL(tabCloseRequested(int)),
 404                 this, SLOT(on_tab_close_requested(int)));
 405         connect(&session_selector_, SIGNAL(currentChanged(int)),
 406                 this, SLOT(on_tab_changed(int)));
 407
 408
 409         connect(static_cast<QApplication *>(QCoreApplication::instance()),
 410                 SIGNAL(focusChanged(QWidget*, QWidget*)),
 411                 this, SLOT(on_focus_changed()));
 412 }
 413
 414 void MainWindow::save_ui_settings()
 415 {
 416         QSettings settings;
 417         int id = 0;
 418
 419         settings.beginGroup("MainWindow");
 420         settings.setValue("state", saveState());
 421         settings.setValue("geometry", saveGeometry());
 422         settings.endGroup();
 423
 424         for (shared_ptr<Session> session : sessions_) {
 425                 // Ignore sessions using the demo device or no device at all
 426                 if (session->device()) {
 427                         shared_ptr<devices::HardwareDevice> device =
 428                                 dynamic_pointer_cast< devices::HardwareDevice >
 429                                 (session->device());
 430
 431                         if (device &&
 432                                 device->hardware_device()->driver()->name() == "demo")
 433                                 continue;
 434
 435                         settings.beginGroup("Session" + QString::number(id++));
 436                         settings.remove("");  // Remove all keys in this group
 437                         session->save_settings(settings);
 438                         settings.endGroup();
 439                 }
 440         }
 441
 442         settings.setValue("sessions", id);
 443 }
 444
 445 void MainWindow::restore_ui_settings()
 446 {
 447         QSettings settings;
 448         int i, session_count;
 449
 450         settings.beginGroup("MainWindow");
 451
 452         if (settings.contains("geometry")) {
 453                 restoreGeometry(settings.value("geometry").toByteArray());
 454                 restoreState(settings.value("state").toByteArray());
 455         } else
 456                 resize(1000, 720);
 457
 458         settings.endGroup();
 459
 460         session_count = settings.value("sessions", 0).toInt();
 461
 462         for (i = 0; i < session_count; i++) {
 463                 settings.beginGroup("Session" + QString::number(i));
 464                 shared_ptr<Session> session = add_session();
 465                 session->restore_settings(settings);
 466                 settings.endGroup();
 467         }
 468 }
 469
 470 std::shared_ptr<Session> MainWindow::get_tab_session(int index) const
 471 {
 472         // Find the session that belongs to the tab's main window
 473         for (auto entry : session_windows_)
 474                 if (entry.second == session_selector_.widget(index))
 475                         return entry.first;
 476
 477         return nullptr;
 478 }
 479
 480 void MainWindow::closeEvent(QCloseEvent *event)
 481 {
 482         bool data_saved = true;
 483
 484         for (auto entry : session_windows_)
 485                 if (!entry.first->data_saved())
 486                         data_saved = false;
 487
 488         if (!data_saved && (QMessageBox::question(this, tr("Confirmation"),
 489                 tr("There is unsaved data. Close anyway?"),
 490                 QMessageBox::Yes | QMessageBox::No) == QMessageBox::No)) {
 491                 event->ignore();
 492         } else {
 493                 save_ui_settings();
 494                 event->accept();
 495         }
 496 }
 497
 498 QMenu* MainWindow::createPopupMenu()
 499 {
 500         return nullptr;
 501 }
 502
 503 bool MainWindow::restoreState(const QByteArray &state, int version)
 504 {
 505         (void)state;
 506         (void)version;
 507
 508         // Do nothing. We don't want Qt to handle this, or else it
 509         // will try to restore all the dock widgets and create havoc.
 510
 511         return false;
 512 }
 513
 514 void MainWindow::session_error(const QString text, const QString info_text)
 515 {
 516         QMetaObject::invokeMethod(this, "show_session_error",
 517                 Qt::QueuedConnection, Q_ARG(QString, text),
 518                 Q_ARG(QString, info_text));
 519 }
 520
 521 void MainWindow::show_session_error(const QString text, const QString info_text)
 522 {
 523         QMessageBox msg(this);
 524         msg.setText(text);
 525         msg.setInformativeText(info_text);
 526         msg.setStandardButtons(QMessageBox::Ok);
 527         msg.setIcon(QMessageBox::Warning);
 528         msg.exec();
 529 }
 530
 531 void MainWindow::on_add_view(const QString &title, views::ViewType type,
 532         Session *session)
 533 {
 534         // We get a pointer and need a reference
 535         for (std::shared_ptr<Session> s : sessions_)
 536                 if (s.get() == session)
 537                         add_view(title, type, *s);
 538 }
 539
 540 void MainWindow::on_focus_changed()
 541 {
 542         shared_ptr<views::ViewBase> view = get_active_view();
 543
 544         if (view) {
 545                 for (shared_ptr<Session> session : sessions_) {
 546                         if (session->has_view(view)) {
 547                                 if (session != last_focused_session_) {
 548                                         // Activate correct tab if necessary
 549                                         shared_ptr<Session> tab_session = get_tab_session(
 550                                                 session_selector_.currentIndex());
 551                                         if (tab_session != session)
 552                                                 session_selector_.setCurrentWidget(
 553                                                         session_windows_.at(session));
 554
 555                                         on_focused_session_changed(session);
 556                                 }
 557
 558                                 break;
 559                         }
 560                 }
 561         }
 562
 563         if (sessions_.empty())
 564                 setWindowTitle(WindowTitle);
 565 }
 566
 567 void MainWindow::on_focused_session_changed(shared_ptr<Session> session)
 568 {
 569         last_focused_session_ = session;
 570
 571         setWindowTitle(session->name() + " - " + WindowTitle);
 572
 573         // Update the state of the run/stop button, too
 574         on_capture_state_changed(session.get());
 575 }
 576
 577 void MainWindow::on_new_session_clicked()
 578 {
 579         add_session();
 580 }
 581
 582 void MainWindow::on_run_stop_clicked()
 583 {
 584         shared_ptr<Session> session = last_focused_session_;
 585
 586         if (!session)
 587                 return;
 588
 589         switch (session->get_capture_state()) {
 590         case Session::Stopped:
 591                 session->start_capture([&](QString message) {
 592                         session_error("Capture failed", message); });
 593                 break;
 594         case Session::AwaitingTrigger:
 595         case Session::Running:
 596                 session->stop_capture();
 597                 break;
 598         }
 599 }
 600
 601 void MainWindow::on_settings_clicked()
 602 {
 603         dialogs::Settings dlg(device_manager_);
 604         dlg.exec();
 605 }
 606
 607 void MainWindow::on_session_name_changed()
 608 {
 609         // Update the corresponding dock widget's name(s)
 610         Session *session = qobject_cast<Session*>(QObject::sender());
 611         assert(session);
 612
 613         for (shared_ptr<views::ViewBase> view : session->views()) {
 614                 // Get the dock that contains the view
 615                 for (auto entry : view_docks_)
 616                         if (entry.second == view) {
 617                                 entry.first->setObjectName(session->name());
 618                                 entry.first->setWindowTitle(session->name());
 619                         }
 620         }
 621
 622         // Update the tab widget by finding the main window and the tab from that
 623         for (auto entry : session_windows_)
 624                 if (entry.first.get() == session) {
 625                         QMainWindow *window = entry.second;
 626                         const int index = session_selector_.indexOf(window);
 627                         session_selector_.setTabText(index, session->name());
 628                 }
 629
 630         // Refresh window title if the affected session has focus
 631         if (session == last_focused_session_.get())
 632                 setWindowTitle(session->name() + " - " + WindowTitle);
 633 }
 634
 635 void MainWindow::on_capture_state_changed(QObject *obj)
 636 {
 637         Session *caller = qobject_cast<Session*>(obj);
 638
 639         // Ignore if caller is not the currently focused session
 640         // unless there is only one session
 641         if ((sessions_.size() > 1) && (caller != last_focused_session_.get()))
 642                 return;
 643
 644         int state = caller->get_capture_state();
 645
 646         const QIcon *icons[] = {&icon_grey_, &icon_red_, &icon_green_};
 647         run_stop_button_->setIcon(*icons[state]);
 648         run_stop_button_->setText((state == pv::Session::Stopped) ?
 649                 tr("Run") : tr("Stop"));
 650 }
 651
 652 void MainWindow::on_new_view(Session *session)
 653 {
 654         // We get a pointer and need a reference
 655         for (std::shared_ptr<Session> s : sessions_)
 656                 if (s.get() == session)
 657                         add_view(session->name(), views::ViewTypeTrace, *s);
 658 }
 659
 660 void MainWindow::on_view_close_clicked()
 661 {
 662         // Find the dock widget that contains the close button that was clicked
 663         QObject *w = QObject::sender();
 664         QDockWidget *dock = nullptr;
 665
 666         while (w) {
 667             dock = qobject_cast<QDockWidget*>(w);
 668             if (dock)
 669                 break;
 670             w = w->parent();
 671         }
 672
 673         // Get the view contained in the dock widget
 674         shared_ptr<views::ViewBase> view;
 675
 676         for (auto entry : view_docks_)
 677                 if (entry.first == dock)
 678                         view = entry.second;
 679
 680         // Deregister the view
 681         for (shared_ptr<Session> session : sessions_) {
 682                 if (!session->has_view(view))
 683                         continue;
 684
 685                 // Also destroy the entire session if its main view is closing...
 686                 if (view == session->main_view()) {
 687                         // ...but only if data is saved or the user confirms closing
 688                         if (session->data_saved() || (QMessageBox::question(this, tr("Confirmation"),
 689                                 tr("This session contains unsaved data. Close it anyway?"),
 690                                 QMessageBox::Yes | QMessageBox::No) == QMessageBox::Yes))
 691                                 remove_session(session);
 692                         break;
 693                 } else
 694                         // All other views can be closed at any time as no data will be lost
 695                         remove_view(view);
 696         }
 697 }
 698
 699 void MainWindow::on_tab_changed(int index)
 700 {
 701         shared_ptr<Session> session = get_tab_session(index);
 702
 703         if (session)
 704                 on_focused_session_changed(session);
 705 }
 706
 707 void MainWindow::on_tab_close_requested(int index)
 708 {
 709         shared_ptr<Session> session = get_tab_session(index);
 710
 711         assert(session);
 712
 713         if (session->data_saved() || (QMessageBox::question(this, tr("Confirmation"),
 714                 tr("This session contains unsaved data. Close it anyway?"),
 715                 QMessageBox::Yes | QMessageBox::No) == QMessageBox::Yes))
 716                 remove_session(session);
 717 }
 718
 719 void MainWindow::on_view_coloured_bg_shortcut()
 720 {
 721         GlobalSettings settings;
 722
 723         bool state = settings.value(GlobalSettings::Key_View_ColouredBG).toBool();
 724         settings.setValue(GlobalSettings::Key_View_ColouredBG, !state);
 725 }
 726
 727 void MainWindow::on_view_sticky_scrolling_shortcut()
 728 {
 729         GlobalSettings settings;
 730
 731         bool state = settings.value(GlobalSettings::Key_View_StickyScrolling).toBool();
 732         settings.setValue(GlobalSettings::Key_View_StickyScrolling, !state);
 733 }
 734
 735 void MainWindow::on_settingViewColouredBg_changed(const QVariant new_value)
 736 {
 737         bool state = new_value.toBool();
 738
 739         for (auto entry : view_docks_) {
 740                 shared_ptr<views::ViewBase> viewbase = entry.second;
 741
 742                 // Only trace views have this setting
 743                 views::TraceView::View* view =
 744                                 qobject_cast<views::TraceView::View*>(viewbase.get());
 745                 if (view)
 746                         view->enable_coloured_bg(state);
 747         }
 748 }
 749
 750 void MainWindow::on_close_current_tab()
 751 {
 752         int tab = session_selector_.currentIndex();
 753
 754         on_tab_close_requested(tab);
 755 }
 756
 757 } // namespace pv