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/**
* @file llteleporthistory.h
* @brief Teleport history
*
* $LicenseInfo:firstyear=2009&license=viewergpl$
*
* Copyright (c) 2009, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at
* http://secondlifegrid.net/programs/open_source/licensing/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
*/
#ifndef LL_LLTELEPORTHISTORY_H
#define LL_LLTELEPORTHISTORY_H
#include "llsingleton.h" // for LLSingleton
#include <vector>
#include <string>
#include <boost/function.hpp>
#include <boost/signals2/connection.hpp>
/**
* An item of the teleport history.
*
* Contains the location's global coordinates and its title.
*/
class LLTeleportHistoryItem
{
public:
LLTeleportHistoryItem()
{}
LLTeleportHistoryItem(std::string title, LLVector3d global_pos)
: mTitle(title), mGlobalPos(global_pos)
{}
LLTeleportHistoryItem(const LLSD& val);
LLSD toLLSD() const;
std::string mTitle; // human-readable location title
LLVector3d mGlobalPos; // global position
};
/**
* Teleport history.
*
* Along with the navigation bar "Back" and "Forward" buttons
* implements web browser-like navigation functionality.
*
* @see LLNavigationBar
*/
class LLTeleportHistory: public LLSingleton<LLTeleportHistory>
{
LOG_CLASS(LLTeleportHistory);
public:
typedef std::vector<LLTeleportHistoryItem> slurl_list_t;
typedef boost::function<void()> history_callback_t;
LLTeleportHistory();
~LLTeleportHistory();
/**
* Go back in the history.
*/
void goBack() { goToItem(getCurrentItemIndex() - 1); }
/**
* Go forward in the history.
*/
void goForward() { goToItem(getCurrentItemIndex() + 1); }
/**
* Go to specific item in the history.
*
* The item is specified by its index (starting from 0).
*/
void goToItem(int idx);
/**
* @return history items.
*/
const slurl_list_t& getItems() const { return mItems; }
/**
* Is the history empty?
*
* History containing single item is treated as empty
* because the item points to the current location.
*/
bool isEmpty() const { return mItems.size() <= 1; }
/**
* Get index of the current location in the history.
*/
int getCurrentItemIndex() const { return mCurrentItem; }
/**
* Set a callback to be called upon history changes.
*/
void setHistoryChangedCallback(history_callback_t cb);
/**
* Save the history to a file, so that it can be restored upon next logon.
*/
void save() const;
/**
* Load previously saved history from a file.
*/
void load();
/**
* Save history to a file so that we can restore it on startup.
*
* @see load()
*/
void dump() const;
private:
/**
* Update current location.
*
* Called when a teleport finishes.
*
* Takes mHistoryTeleportInProgress into consideration: if it's false
* (i.e. user is teleporting to an arbitrary location, not to a history item)
* we purge forward items.
*
* @see mHistoryTeleportInProgress
* @see mGotInitialUpdate
*/
void updateCurrentLocation();
/**
* Invokes mHistoryChangedCallback.
*/
void onHistoryChanged();
static std::string getCurrentLocationTitle();
/**
* Actually, the teleport history.
*/
slurl_list_t mItems;
/**
* Current position within the history.
*/
int mCurrentItem;
/**
* Indicates whether teleport back/forward is currently in progress.
*
* Helps to make sure we don't purge forward items
* when a teleport within history finishes.
*
* @see updateCurrentLocation()
*/
bool mHistoryTeleportInProgress;
/**
* Have we received the initial location update?
*
* @see updateCurrentLocation()
*/
bool mGotInitialUpdate;
/**
* File to store the history to.
*/
std::string mFilename;
/**
* Callback to be called when the history gets changed.
*/
history_callback_t mHistoryChangedCallback;
/**
* Teleport notification connection.
*
* Using this connection we get notified when a teleport finishes
* or initial location update occurs.
*/
boost::signals2::connection mTeleportFinishedConn;
};
#endif
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