[Theme] Make theme as singleton

src/core/plugin.cpp

@@ -1,3 +1,23 @@
+/*
+ * Copyright (C) 2018-2025 Chupligin Sergey <[email protected]>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+
 #include "plugin.h"
 #include "nemoimageprovider.h"
 #include "sizing.h"
@@ -8,16 +28,5 @@ void QQuickNemoControlsExtensionPlugin::registerTypes(const char* uri)
 {
     Q_ASSERT(uri == QLatin1String("Nemo"));
     qmlRegisterModule(uri, 2, 0);
-}
-
-void QQuickNemoControlsExtensionPlugin::initializeEngine(QQmlEngine* engine, const char* uri)
-{
-    Theme* theme = new Theme();
-
-    QQmlExtensionPlugin::initializeEngine(engine, uri);
-    QQmlContext* context = engine->rootContext();
-    context->setContextProperty("size", theme->size());
-    context->setContextProperty("Theme", theme);
-
-    engine->addImageProvider(QLatin1String("theme"), new NemoImageProvider);
+    qmlRegisterSingletonType<Theme>(uri, 1, 0, "Theme", &Theme::qmlInstance);
 }

src/core/plugin.h

@@ -1,3 +1,22 @@
+/*
+ * Copyright (C) 2018-2025 Chupligin Sergey <[email protected]>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
 #ifndef QQUICKNEMOCONTROLSEXTENSIONPLUGIN_H
 #define QQUICKNEMOCONTROLSEXTENSIONPLUGIN_H
 
@@ -9,7 +28,6 @@ class QQuickNemoControlsExtensionPlugin : public QQmlExtensionPlugin {
     Q_PLUGIN_METADATA(IID QQmlEngineExtensionInterface_iid FILE "nemo.json")
 public:
     void registerTypes(const char* uri);
-    void initializeEngine(QQmlEngine* engine, const char* uri);
 };
 
 #endif // QQUICKNEMOCONTROLSEXTENSIONPLUGIN_H

src/core/theme.cpp

@@ -26,6 +26,8 @@
 #include <QJsonObject>
 #include <math.h>
 
+static Theme* themeInstance = 0;
+
 Theme::Theme(QObject* parent)
     : QObject(parent)
     , m_size(new Sizing)
@@ -45,6 +47,16 @@ Theme::Theme(QObject* parent)
     }
 }
 
+QObject *Theme::qmlInstance(QQmlEngine *engine, QJSEngine *scriptEngine)
+{
+    Q_UNUSED(engine);
+    Q_UNUSED(scriptEngine);
+    if(!themeInstance) {
+        themeInstance = new Theme();
+    }
+    return themeInstance;
+}
+
 bool Theme::loadTheme(QString fileName)
 {
     QFile themeFile(fileName);

src/core/theme.h

@@ -22,11 +22,13 @@
 
 #include <MDConfItem>
 #include <QObject>
+#include <QQmlEngine>
 
 class Sizing;
 
 class Theme : public QObject {
     Q_OBJECT
+    Q_DISABLE_COPY(Theme)
 
     Q_PROPERTY(qreal iconSizeLauncher READ iconSizeLauncher NOTIFY themeUpdated)
 
@@ -69,6 +71,8 @@ class Theme : public QObject {
 
 public:
     explicit Theme(QObject* parent = nullptr);
+    static QObject *qmlInstance(QQmlEngine *engine, QJSEngine *scriptEngine);
+
     Sizing* size() const { return m_size; }
 
     Q_INVOKABLE bool loadTheme(const QString fileName);