Improved the Time preflet (still not working properly, though)

* basically rewrote TimeZone to sport a nicer to use interface
* adjusted all users of TimeZone accordingly
* changed TZDisplay to show the Date next to the label, in
  order to avoid that long timezone names draw all over it
* the timezone listview is now properly sorted according
  to the current language (using BCollator)
* fixed a couple of bugs (overflows, etc.) that caused
  incorrect GMT offsets to be used during computations


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@37813 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/os/locale/TimeZone.h

@@ -1,31 +1,34 @@
 /*
-Copyright 2010, Haiku, Inc.
-Distributed under the terms of the MIT License.
-*/
+ * Copyright 2010, Haiku, Inc. All rights reserved.
+ * Distributed under the terms of the MIT License.
+ */
+#ifndef _TIME_ZONE_H
+#define _TIME_ZONE_H
 
 
-#ifndef __TIMEZONE_H__
-#define __TIMEZONE_H__
-
-
-class BString;
-namespace icu_44 {
-	class TimeZone;
-}
+#include <String.h>
 
 
 class BTimeZone {
-	public:
-					BTimeZone(const char* zoneCode);
-					~BTimeZone();
+public:
+								BTimeZone(const char* zoneCode = NULL);
+								~BTimeZone();
 
-		void		GetName(BString& name);
-		void		GetCode(char* buffer, int size);
-		int			OffsetFromGMT();
+			const BString&		Code() const;
+			const BString&		Name() const;
+			int					OffsetFromGMT() const;
 
-	private:
-		icu_44::TimeZone*	fICUTimeZone;
+			status_t			InitCheck() const;
+
+private:
+			void				_Init(const char* zoneCode);
+
+			BString				fCode;
+			BString				fName;
+			int					fOffsetFromGMT;
+
+			status_t			fInitStatus;
 };
 
 
-#endif
+#endif	// _TIME_ZONE_H