feat: 使用dbus支持kde的暗色模式

src/backend/ThemeChecker.h

@@ -0,0 +1,26 @@
+#ifndef THEMECHECKER_H
+#define THEMECHECKER_H
+
+#include <QObject>
+#include <QTimer>
+
+
+class ThemeChecker : public QObject
+{
+    Q_OBJECT
+public:
+    explicit ThemeChecker(QObject *parent = nullptr);
+
+signals:
+    void themeChanged(bool isDark);
+
+public slots:
+    void checkThemeChange();
+
+
+private:
+    int lastColorSchema;
+    QTimer *timer;
+};
+
+#endif // THEMECHECKER_H