bar can now toggle bluetooth power and discovery

include/services/bluetooth.hpp

@@ -0,0 +1,35 @@
+#pragma once
+
+#include <gio/gio.h>
+#include <gtk/gtk.h>
+
+#include "sigc++/signal.h"
+
+class BluetoothService {
+  public:
+    BluetoothService();
+
+    sigc::signal<void(bool)> powerStateChangedSignal;
+    sigc::signal<void(bool)> isDiscoveringChangedSignal;
+
+    bool getPowerState();
+    void setPowerState(bool state);
+
+    bool getIsDiscovering();
+    void setIsDiscovering(bool state);
+
+private:
+    GDBusProxy *adapter_proxy = nullptr;
+    bool powerState           = false;
+    bool isDiscovering        = false;
+
+    void onPropertyChanged(GDBusProxy *proxy,
+                           GVariant *changed_properties,
+                           const gchar *const *invalidated_properties,
+                           gpointer user_data);
+
+    static void onPropertyChangedStatic(GDBusProxy *proxy,
+                                        GVariant *changed_properties,
+                                        const gchar *const *invalidated_properties,
+                                        gpointer user_data);
+};