use Qt backend of KDE5

commit fixes problem with usage of GTK3 fallback menu action used on KDE5, probably to a bug in status notifier
- allows using Qt backend on KDE5 and other plasma related env.
- icon in tray menu and tray icon are loaded from svg, their size is not limited to 50px now
- plasma adds extra actionmenu to tray so quit was renamed to exit
- exit action usues system-default icon for quit and system default keyboard shourtcut to close qtox

src/widget/systemtrayicon.cpp

@@ -26,8 +26,9 @@
 #include <QDebug>
 #include "src/persistence/settings.h"
 
-SystemTrayIcon::SystemTrayIcon()
+SystemTrayIcon::SystemTrayIcon(Widget *parent)
 {
+    this->parent = parent;
     QString desktop = getenv("XDG_CURRENT_DESKTOP");
     if (desktop.isEmpty())
         desktop = getenv("DESKTOP_SESSION");
@@ -88,28 +89,12 @@ SystemTrayIcon::SystemTrayIcon()
         g_signal_connect(gtkIcon, "button-release-event", G_CALLBACK(callbackButtonClick), this);
     }
     #endif
-    #ifdef ENABLE_SYSTRAY_STATUSNOTIFIER_BACKEND
-    else if (desktop == "kde"
-            && getenv("KDE_SESSION_VERSION") == QString("5"))
+    else if (desktop == "kde" && getenv("KDE_SESSION_VERSION") == QString("5"))
     {
-        qDebug() << "Using Status Notifier backend";
-        backendType = SystrayBackendType::StatusNotifier;
-        gtk_init(nullptr, nullptr);
-        snMenu = gtk_menu_new();
-
-        // No ':' needed in resource path!
-        GdkPixbuf *pixbuf = gdk_pixbuf_new_from_resource("/img/icon.png", NULL);
-        statusNotifier = status_notifier_new_from_pixbuf("qtox",
-                            STATUS_NOTIFIER_CATEGORY_APPLICATION_STATUS, pixbuf);
-        status_notifier_register(statusNotifier);
-        g_object_unref(pixbuf);
-    }
-    #endif
-    else if (desktop == "kde"
-             && getenv("KDE_SESSION_VERSION") == QString("5"))
-    {
-        backendType = SystrayBackendType::KDE5;
-        qWarning() << "Detected a KDE5 session, but we don't have Status Notifier support. Disabling the systray icon";
+        qDebug() << "Using the Qt backend";
+        qtIcon = new QSystemTrayIcon;
+        backendType = SystrayBackendType::Qt;
+        connect(qtIcon, &QSystemTrayIcon::activated, this, &SystemTrayIcon::activated);
     }
     else
     {

src/widget/systemtrayicon.h

@@ -22,6 +22,7 @@
 #define SYSTEMTRAYICON_H
 
 #include "systemtrayicon_private.h"
+#include "widget.h"
 #include <QObject>
 
 class QSystemTrayIcon;
@@ -31,7 +32,7 @@ class SystemTrayIcon : public QObject
 {
     Q_OBJECT
 public:
-    SystemTrayIcon();
+    SystemTrayIcon(Widget *parent);
     ~SystemTrayIcon();
     void setContextMenu(QMenu* menu);
     void show();
@@ -48,6 +49,8 @@ private:
 private:
     SystrayBackendType backendType;
     QSystemTrayIcon* qtIcon;
+    Widget *parent;
+
 #ifdef ENABLE_SYSTRAY_UNITY_BACKEND
     AppIndicator *unityIndicator;
     GtkWidget *unityMenu;

src/widget/widget.cpp

@@ -71,6 +71,7 @@
 #include <QList>
 #include <QDesktopServices>
 #include <QProcess>
+#include <QSvgRenderer>
 #include <QWindow>
 #include <tox/tox.h>
 
@@ -119,14 +120,16 @@ void Widget::init()
     offlineMsgTimer->start(15000);
 
     statusOnline = new QAction(this);
-    statusOnline->setIcon(getStatusIcon(Status::Online, 10, 10));
-    connect(statusOnline, SIGNAL(triggered()), this, SLOT(setStatusOnline()));
+    statusOnline->setIcon(getStatusIcon(Status::Online, 50, 50));
+    connect(statusOnline, &QAction::triggered, this, &Widget::setStatusOnline);
+
     statusAway = new QAction(this);
-    statusAway->setIcon(getStatusIcon(Status::Away, 10, 10));
-    connect(statusAway, SIGNAL(triggered()), this, SLOT(setStatusAway()));
+    statusAway->setIcon(getStatusIcon(Status::Away, 50, 50));
+    connect(statusAway, &QAction::triggered, this, &Widget::setStatusAway);
+
     statusBusy = new QAction(this);
-    statusBusy->setIcon(getStatusIcon(Status::Busy, 10, 10));
-    connect(statusBusy, SIGNAL(triggered()), this, SLOT(setStatusBusy()));
+    statusBusy->setIcon(getStatusIcon(Status::Busy, 50, 50));
+    connect(statusBusy, &QAction::triggered, this, &Widget::setStatusBusy);
 
     layout()->setContentsMargins(0, 0, 0, 0);
     ui->friendList->setStyleSheet(Style::resolve(Style::getStylesheet(":ui/friendList/friendList.css")));
@@ -412,7 +415,16 @@ void Widget::updateIcons()
     if (ico.isNull())
     {
         QString color = Settings::getInstance().getLightTrayIcon() ? "light" : "dark";
-        ico = QIcon(":img/taskbar/" + color + "/taskbar_" + status + ".svg");
+        QString path = ":img/taskbar/" + color + "/taskbar_" + status + ".svg";
+
+        QSvgRenderer renderer(path);
+
+        // Prepare a QImage with desired characteritisc
+        QImage image(250, 250, QImage::Format_ARGB32_Premultiplied);
+
+        QPainter painter(&image);
+        renderer.render(&painter);
+        ico = QIcon(QPixmap::fromImage(image));
     }
 
     setWindowIcon(ico);
@@ -1682,12 +1694,14 @@ void Widget::onTryCreateTrayIcon()
     {
         if (QSystemTrayIcon::isSystemTrayAvailable())
         {
-            icon = new SystemTrayIcon;
+            icon = new SystemTrayIcon(this);
             updateIcons();
-            trayMenu = new QMenu;
-
-            actionQuit = new QAction(tr("&Quit"), this);
-            connect(actionQuit, SIGNAL(triggered()), qApp, SLOT(quit()));
+            trayMenu = new QMenu(this);
+            QStyle *style = qApp->style();
+            actionQuit = new QAction(tr("&Exit"), this);
+            actionQuit->setShortcut(QKeySequence::Quit); // system default quit shorcut
+            actionQuit->setIcon(style->standardIcon(QStyle::SP_DialogCloseButton)); // system default exit icon
+            connect(actionQuit, &QAction::triggered, qApp, &QApplication::quit);
 
             trayMenu->addAction(statusOnline);
             trayMenu->addAction(statusAway);
@@ -1696,8 +1710,7 @@ void Widget::onTryCreateTrayIcon()
             trayMenu->addAction(actionQuit);
             icon->setContextMenu(trayMenu);
 
-            connect(icon, SIGNAL(activated(QSystemTrayIcon::ActivationReason)),
-                    this, SLOT(onIconClick(QSystemTrayIcon::ActivationReason)));
+            connect(icon, &SystemTrayIcon::activated, this, &Widget::onIconClick);
 
             if (Settings::getInstance().getShowSystemTray())
             {
@@ -1909,12 +1922,9 @@ QString Widget::getStatusIconPath(Status status)
     }
 }
 
-inline QIcon Widget::getStatusIcon(Status status, uint32_t w/*=0*/, uint32_t h/*=0*/)
+inline QIcon Widget::getStatusIcon(Status status, uint32_t, uint32_t)
 {
-    if (w > 0 && h > 0)
-        return getStatusIconPixmap(status, w, h);
-    else
-        return QIcon(getStatusIconPath(status));
+    return QIcon(getStatusIconPath(status));
 }
 
 QPixmap Widget::getStatusIconPixmap(Status status, uint32_t w, uint32_t h)