Added custom tooltip with device icon, device name and battery status

include/modules/upower/upower_tooltip.hpp

@@ -0,0 +1,29 @@
+#pragma once
+
+#include <libupower-glib/upower.h>
+
+#include "gtkmm/box.h"
+#include "gtkmm/label.h"
+#include "gtkmm/window.h"
+
+namespace waybar::modules::upower {
+
+class UPowerTooltip : public Gtk::Window {
+ private:
+  typedef std::unordered_map<std::string, UpDevice*> Devices;
+
+  std::string getDeviceIcon(UpDeviceKind& kind);
+
+  Gtk::Box* contentBox;
+
+  uint iconSize;
+  uint tooltipSpacing;
+
+ public:
+  UPowerTooltip(uint iconSize, uint tooltipSpacing);
+  ~UPowerTooltip();
+
+  uint updateTooltip(Devices& devices);
+};
+
+}  // namespace waybar::modules::upower