quicksettings/screenrotation: hide when not available

On devices where auto-rotate is not (yet) available, make sure not to
show an auto-rotate toggle with no functionality.

quicksettings/screenrotation/dbus/org.kde.KScreen.xml

@@ -1,7 +1,7 @@
 <!DOCTYPE node PUBLIC "-//freedesktop//DTD D-BUS Object Introspection 1.0//EN"
 "http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd">
-<!-- 
-- SPDX-FileCopyrightText: 2020 Luca Weiss
+<!--
+- SPDX-FileCopyrightText: 2020-2022 Luca Weiss <luca@z3ntu.xyz>
 - SPDX-FileCopyrightText: 2020 Bhushan Shah <bshah@kde.org>
 - SPDX-FileCopyrightText: 2018 Kai Uwe Broulik <kde@privat.broulik.de>
 - SPDX-FileCopyrightText: 2013-2014 Daniel Vrátil <dvratil@kde.org>
@@ -18,6 +18,9 @@
         <method name="setAutoRotate">
             <arg type="b" name="value" direction="in" />
         </method>
+        <method name="isAutoRotateAvailable">
+            <arg type="b" direction="out" />
+        </method>
         <signal name="outputConnected">
             <arg type="s" name="outputName" direction="out" />
         </signal>

quicksettings/screenrotation/package/contents/ui/main.qml

@@ -11,6 +11,7 @@ MobileShell.QuickSetting {
     icon: "rotation-allowed"
     settingsCommand: "plasma-open-settings kcm_kscreen"
     enabled: ScreenRotationUtil.screenRotationEnabled
+    available: ScreenRotationUtil.available
     function toggle() {
         ScreenRotationUtil.screenRotationEnabled = !enabled
     }

quicksettings/screenrotation/screenrotationutil.cpp

@@ -39,3 +39,15 @@ void ScreenRotationUtil::setScreenRotation(bool value)
         Q_EMIT screenRotationChanged(value);
     }
 }
+
+bool ScreenRotationUtil::isAvailable()
+{
+    QDBusPendingReply<bool> reply = m_kscreenInterface->isAutoRotateAvailable();
+    reply.waitForFinished();
+    if (reply.isError()) {
+        qWarning() << "Getting available failed:" << reply.error().name() << reply.error().message();
+        return false;
+    } else {
+        return reply.value();
+    }
+}

quicksettings/screenrotation/screenrotationutil.h

@@ -14,6 +14,7 @@ class ScreenRotationUtil : public QObject
 {
     Q_OBJECT
     Q_PROPERTY(bool screenRotationEnabled READ screenRotation WRITE setScreenRotation NOTIFY screenRotationChanged);
+    Q_PROPERTY(bool available READ isAvailable);
 
 public:
     ScreenRotationUtil(QObject *parent = nullptr);
@@ -21,6 +22,8 @@ public:
     bool screenRotation();
     void setScreenRotation(bool value);
 
+    bool isAvailable();
+
 Q_SIGNALS:
     void screenRotationChanged(bool value);