Add action to open the system monitor from the applet

It's also accessible by middle clicking on it
BUG:432588
FIXED-IN:5.22

applets/systemmonitor/systemmonitor/CMakeLists.txt

@@ -16,6 +16,8 @@ target_link_libraries(plasma_applet_systemmonitor
                       KF5::ConfigCore
                       KF5::ConfigGui
                       KF5::Declarative
+                      KF5::KIOGui
+                      KF5::Notifications
                       KSysGuard::SysGuard
                       KSysGuard::Sensors
                       KSysGuard::SensorFaces

applets/systemmonitor/systemmonitor/package/contents/ui/main.qml

@@ -52,4 +52,19 @@ Item {
     }
 
     Plasmoid.configurationRequired: plasmoid.nativeInterface.faceController.highPrioritySensorIds.length == 0 && plasmoid.nativeInterface.faceController.lowPrioritySensorIds.length == 0 && plasmoid.nativeInterface.faceController.totalSensor.length == 0
+
+    MouseArea {
+        parent: plasmoid
+        anchors.fill: plasmoid
+        acceptedButtons: Qt.MiddleButton
+        onClicked: action_openSystemMonitor()
+    }
+
+    function action_openSystemMonitor() {
+        Plasmoid.nativeInterface.openSystemMonitor()
+    }
+
+    Component.onCompleted: {
+        Plasmoid.setAction("openSystemMonitor", i18nc("@action", "Open System Monitor..."), "utilities-system-monitor")
+    }
 }

applets/systemmonitor/systemmonitor/systemmonitor.cpp

@@ -31,7 +31,10 @@
 
 #include <KConfigLoader>
 #include <KDeclarative/QmlObjectSharedEngine>
+#include <KIO/ApplicationLauncherJob>
 #include <KLocalizedString>
+#include <KNotifications/KNotificationJobUiDelegate>
+#include <KService>
 
 SystemMonitor::SystemMonitor(QObject *parent, const QVariantList &args)
     : Plasma::Applet(parent, args)
@@ -91,6 +94,13 @@ void SystemMonitor::configChanged()
     }
 }
 
+void SystemMonitor::openSystemMonitor()
+{
+    auto job = new KIO::ApplicationLauncherJob(KService::serviceByDesktopName("org.kde.plasma-systemmonitor"));
+    job->setUiDelegate(new KNotificationJobUiDelegate(KJobUiDelegate::AutoHandlingEnabled));
+    job->start();
+}
+
 K_EXPORT_PLASMA_APPLET_WITH_JSON(systemmonitor, SystemMonitor, "metadata.json")
 
 #include "systemmonitor.moc"

applets/systemmonitor/systemmonitor/systemmonitor.h

@@ -49,6 +49,7 @@ public:
     ~SystemMonitor() override;
 
     void init() override;
+    Q_INVOKABLE void openSystemMonitor();
 
     KSysGuard::SensorFaceController *faceController() const;