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diff --git a/src/indicator.h b/src/indicator.h
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+/*
+ * Copyright 2014 Canonical Ltd.
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 3, as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranties of
+ * MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR
+ * PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *   Charles Kerr <charles.kerr@canonical.com>
+ */
+
+#ifndef INDICATOR_DISPLAY_INDICATOR_H
+#define INDICATOR_DISPLAY_INDICATOR_H
+
+#include <core/property.h>
+
+#include <gio/gio.h> // GIcon
+
+#include <string>
+#include <vector>
+
+struct Header
+{
+  bool is_visible = false;
+  std::string title;
+  std::string label;
+  std::string a11y;
+  std::shared_ptr<GIcon> icon;
+
+  bool operator== (const Header& that) const {
+    return (is_visible == that.is_visible) &&
+           (title == that.title) &&
+           (label == that.label) &&
+           (a11y == that.a11y) &&
+           (icon == that.icon);
+  }
+  bool operator!= (const Header& that) const { return !(*this == that);}
+};
+
+
+class Profile
+{
+public:
+  virtual std::string name() const =0;
+  virtual const core::Property<Header>& header() const =0;
+  virtual std::shared_ptr<GMenuModel> menu_model() const =0;
+
+protected:
+  Profile() =default;
+};
+
+
+class SimpleProfile: public Profile
+{
+public:
+  SimpleProfile(const char* name, const std::shared_ptr<GMenuModel>& menu): m_name(name), m_menu(menu) {}
+
+  std::string name() const {return m_name;}
+  core::Property<Header>& header() {return m_header;}
+  const core::Property<Header>& header() const {return m_header;}
+  std::shared_ptr<GMenuModel> menu_model() const {return m_menu;}
+
+protected:
+  const std::string m_name;
+  core::Property<Header> m_header;
+  std::shared_ptr<GMenuModel> m_menu;
+};
+
+
+class Indicator
+{
+public:
+  virtual ~Indicator() =default;
+
+  virtual const char* name() const =0;
+  virtual GSimpleActionGroup* action_group() const =0;
+  virtual std::vector<std::shared_ptr<Profile>> profiles() const =0;
+};
+
+#endif