Add an abstract class to be implemented by any class that needs theming

common/themes/themable.h

@@ -0,0 +1,24 @@
+#ifndef THEMABLE_H
+#define THEMABLE_H
+
+#include "theme_manager.h"
+
+class Themable
+{
+protected:
+    void initTheme(QObject *owner)
+    {
+        QObject::connect(&ThemeManager::instance(),
+                         &ThemeManager::themeChanged,
+                         owner,
+                         [this]() {
+                             applyTheme();
+                         });
+
+        applyTheme();
+    }
+
+    virtual void applyTheme() = 0;
+};
+
+#endif // THEMABLE_H