Libsource: Fix the multithread bug in QML engine.

lib_source/ribbontheme.cpp

@@ -23,8 +23,14 @@ RibbonTheme::RibbonTheme()
 }
 
 RibbonTheme* RibbonTheme::instance(){
-    static RibbonTheme instance;
-    return &instance;
+    static QMutex mutex;
+    QMutexLocker locker(&mutex);
+
+    static RibbonTheme *singleton = nullptr;
+    if (!singleton) {
+        singleton = new RibbonTheme();
+    }
+    return singleton;
 }
 
 bool RibbonTheme::eventFilter(QObject *obj, QEvent *event)

lib_source/ribbontheme.h

@@ -10,16 +10,18 @@ class RibbonTheme : public QQuickItem
     QML_ELEMENT
     QML_SINGLETON
     QML_NAMED_ELEMENT(RibbonTheme)
+    Q_DISABLE_COPY(RibbonTheme)
 
     Q_PROPERTY(bool dark_mode READ dark_mode() NOTIFY dark_modeChanged FINAL)
     Q_PROPERTY_RW(RibbonThemeType::ThemeMode,theme_mode)
     Q_PROPERTY_RW(bool,modern_style)
 public:
-    RibbonTheme();
+    static RibbonTheme* create(QQmlEngine *qmlEngine, QJSEngine *jsEngine){return instance();}
     static RibbonTheme* instance();
     Q_SIGNAL void dark_modeChanged();
     bool dark_mode();
 private:
+    RibbonTheme();
     bool eventFilter(QObject *obj, QEvent *event);
     RibbonThemeType::ThemeMode current_theme();
     RibbonThemeType::ThemeMode _system_theme_mode;

lib_source/ribbonui.cpp

@@ -1,5 +1,5 @@
 #include "ribbonui.h"
-
+#include <QMutex>
 #define STR(x) #x
 #define JOIN(a,b,c,d) STR(a.b.c.d)
 #define VER_JOIN(x) JOIN x
@@ -11,6 +11,12 @@ RibbonUI::RibbonUI(QQuickItem *parent)
 }
 
 RibbonUI* RibbonUI::instance(){
-    static RibbonUI instance;
-    return &instance;
+    static QMutex mutex;
+    QMutexLocker locker(&mutex);
+
+    static RibbonUI *singleton = nullptr;
+    if (!singleton) {
+        singleton = new RibbonUI();
+    }
+    return singleton;
 }

lib_source/ribbonui.h

@@ -10,10 +10,13 @@ class RibbonUI : public QQuickItem
     QML_ELEMENT
     QML_SINGLETON
     QML_NAMED_ELEMENT(RibbonUI)
+    Q_DISABLE_COPY(RibbonUI)
     Q_PROPERTY_RW(QString, version)
 public:
-    explicit RibbonUI(QQuickItem *parent = nullptr);
     static RibbonUI* instance();
+    static RibbonUI* create(QQmlEngine *qmlEngine, QJSEngine *jsEngine){return instance();}
+private:
+    explicit RibbonUI(QQuickItem *parent = nullptr);
 };
 
 #endif // RIBBONUI_H