MACOSX: Add Sparkle support

common/updates.h

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef BACKENDS_UPDATES_ABSTRACT_H
+#define BACKENDS_UPDATES_ABSTRACT_H
+
+namespace Common {
+
+/**
+ * The UpdateManager allows configuring of the automatic update checking
+ * for systems that support it:
+ *  - using Sparkle on MacOSX
+ *  - using WinSparkle on Windows
+ *
+ * Most of the update checking is completely automated and this class only
+ * gives access to basic settings. It is mostly used by the GUI to set
+ * widgets state on the update page and for manually checking for updates
+ *
+ */
+class UpdateManager {
+public:
+	enum UpdateState {
+		kUpdateStateDisabled     = 0,
+		kUpdateStateEnabled      = 1,
+		kUpdateStateNotSupported = 2
+	};
+
+	enum UpdateInterval {
+		kUpdateIntervalNotSupported = 0,
+		kUpdateIntervalOneDay       = 86400,
+		kUpdateIntervalOneWeek      = 604800,
+		kUpdateIntervalOneMonth     = 2628000   // average seconds per month (60*60*24*365)/12
+	};
+
+	UpdateManager() {}
+	virtual ~UpdateManager() {}
+
+	/**
+	 * Checks manually if an update is available, showing progress UI to the user.
+	 *
+	 * By default, update checks are done silently on start.
+	 * This allows to manually start an update check.
+	 */
+	virtual void checkForUpdates() {}
+
+	/**
+	 * Sets the automatic update checking state
+	 *
+	 * @param  state    The state.
+	 */
+	virtual void setAutomaticallyChecksForUpdates(UpdateState state) {}
+
+	/**
+	 * Gets the automatic update checking state
+	 *
+	 * @return  kUpdateStateDisabled     if automatic update checking is disabled,
+	 *          kUpdateStateEnabled      if automatic update checking is enabled,
+	 *          kUpdateStateNotSupported if automatic update checking is not available
+	 */
+	virtual UpdateState getAutomaticallyChecksForUpdates() { return kUpdateStateNotSupported; }
+
+	/**
+	 * Sets the update checking interval.
+	 *
+	 * @param  interval    The interval.
+	 */
+	virtual void setUpdateCheckInterval(UpdateInterval interval) {}
+
+	/**
+	 * Gets the update check interval.
+	 *
+	 * @return  the update check interval.
+	 */
+	virtual UpdateInterval getUpdateCheckInterval() { return kUpdateIntervalNotSupported; }
+};
+
+}	// End of namespace Common
+
+#endif // BACKENDS_UPDATES_ABSTRACT_H