components: Port Direction enum to c++ to improve load times

According to flame graph testing with qmlprofiler, this caused quite some overhead in QML.

components/mobileshell/CMakeLists.txt

@@ -13,6 +13,7 @@ set(mobileshellplugin_SRCS
     savedquicksettingsmodel.cpp
     shellutil.cpp
     windowutil.cpp
+    components/direction.cpp
     notifications/notificationthumbnailer.cpp
     notifications/notificationfilemenu.cpp
     homescreen/applicationlistmodel.cpp

components/mobileshell/components/direction.cpp

@@ -0,0 +1,7 @@
+/*
+ *  SPDX-FileCopyrightText: 2022 Devin Lin <devin@kde.org>
+ *
+ *  SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "direction.h"

components/mobileshell/components/direction.h

@@ -0,0 +1,18 @@
+/*
+ *  SPDX-FileCopyrightText: 2022 Devin Lin <devin@kde.org>
+ *
+ *  SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#pragma once
+
+#include <QObject>
+
+class Direction : public QObject
+{
+    Q_OBJECT
+
+public:
+    enum Type { None = 0, Up, Down, Left, Right };
+    Q_ENUM(Type)
+};

components/mobileshell/mobileshellplugin.cpp

@@ -9,6 +9,8 @@
 #include <QQmlContext>
 #include <QQuickItem>
 
+#include "components/direction.h"
+
 #include "notifications/notificationfilemenu.h"
 #include "notifications/notificationthumbnailer.h"
 
@@ -48,8 +50,8 @@ void MobileShellPlugin::registerTypes(const char *uri)
         return WindowUtil::instance();
     });
 
-    // taskswitcher
+    // components
-    qmlRegisterType<DisplaysModel>(uri, 1, 0, "DisplaysModel");
+    qmlRegisterType<Direction>(uri, 1, 0, "Direction");
 
     // homescreen
     qmlRegisterSingletonType<ApplicationListModel>(uri, 1, 0, "ApplicationListModel", [](QQmlEngine *, QJSEngine *) -> QObject * {
@@ -63,6 +65,9 @@ void MobileShellPlugin::registerTypes(const char *uri)
     qmlRegisterType<NotificationThumbnailer>(uri, 1, 0, "NotificationThumbnailer");
     qmlRegisterType<NotificationFileMenu>(uri, 1, 0, "NotificationFileMenu");
 
+    // taskswitcher
+    qmlRegisterType<DisplaysModel>(uri, 1, 0, "DisplaysModel");
+
     // qml modules
 
     // /actiondrawer
@@ -72,7 +77,6 @@ void MobileShellPlugin::registerTypes(const char *uri)
 
     // /components
     qmlRegisterType(resolvePath("components/BaseItem.qml"), uri, 1, 0, "BaseItem");
-    qmlRegisterType(resolvePath("components/Direction.qml"), uri, 1, 0, "Direction");
     qmlRegisterType(resolvePath("components/StartupFeedback.qml"), uri, 1, 0, "StartupFeedback");
     qmlRegisterType(resolvePath("components/VelocityCalculator.qml"), uri, 1, 0, "VelocityCalculator");
 

components/mobileshell/qml/actiondrawer/ActionDrawer.qml

@@ -15,8 +15,6 @@ import org.kde.plasma.components 3.0 as PlasmaComponents
 import org.kde.plasma.private.nanoshell 2.0 as NanoShell
 import org.kde.plasma.private.mobileshell 1.0 as MobileShell
 
-import "../components" as Components
-
 Item {
     id: root
     
@@ -60,7 +58,7 @@ Item {
     /**
      * Direction the panel is currently moving in.
      */
-    property int direction: Components.Direction.None
+    property int direction: MobileShell.Direction.None
     
     /**
      * The mode of the action drawer (portrait or landscape).
@@ -111,8 +109,8 @@ Item {
             offset = 0;
         }
         root.direction = (oldOffset === offset) 
-                            ? Components.Direction.None 
+                            ? MobileShell.Direction.None 
-                            : (offset > oldOffset ? Components.Direction.Down : Components.Direction.Up);
+                            : (offset > oldOffset ? MobileShell.Direction.Down : MobileShell.Direction.Up);
             
         oldOffset = offset;
         
@@ -152,7 +150,7 @@ Item {
             // close immediately, so that we don't have to wait PlasmaCore.Units.longDuration 
             root.visible = false;
             close();
-        } else if (root.direction === Components.Direction.None || !root.opened) {
+        } else if (root.direction === MobileShell.Direction.None || !root.opened) {
             if (root.offset < openThreshold) {
                 close();
             } else {
@@ -161,12 +159,12 @@ Item {
         } else if (root.offset > contentContainerLoader.maximizedQuickSettingsOffset) {
             expand();
         } else if (root.offset > contentContainerLoader.minimizedQuickSettingsOffset) {
-            if (root.direction === Components.Direction.Down) {
+            if (root.direction === MobileShell.Direction.Down) {
                 expand();
             } else {
                 open();
             }
-        } else if (root.direction === Components.Direction.Down) {
+        } else if (root.direction === MobileShell.Direction.Down) {
             open();
         } else {
             close();

components/mobileshell/qml/components/Direction.qml

@@ -1,18 +0,0 @@
-/*
- *  SPDX-FileCopyrightText: 2021 Devin Lin <devin@kde.org>
- *
- *  SPDX-License-Identifier: GPL-2.0-or-later
- */
-
-import QtQuick 2.15
-
-QtObject {
-    enum Type {
-        None = 0,
-        Up,
-        Down,
-        Left,
-        Right
-    }
-}
-

components/mobileshell/resources.qrc

@@ -21,7 +21,6 @@
         <file>qml/actiondrawer/PortraitContentContainer.qml</file>
         
         <file>qml/components/BaseItem.qml</file>
-        <file>qml/components/Direction.qml</file>
         <file>qml/components/StartupFeedback.qml</file>
         <file>qml/components/util.js</file>
         <file>qml/components/VelocityCalculator.qml</file>