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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.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
LLUUID mRegionID; // region ID for getting the region info
};
/**
* 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;
typedef boost::signals2::signal<void()> history_signal_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; }
void purgeItems();
/**
* 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.
*
* Multiple callbacks can be set.
*/
boost::signals2::connection setHistoryChangedCallback(history_callback_t cb);
/**
* Save history to a file so that we can restore it on startup.
*
* @see load()
*/
void dump() const;
private:
/**
* Called by when a teleport fails.
*
* Called via callback set on the LLViewerParcelMgr "teleport failed" signal.
*
* @see mTeleportFailedConn
*/
void onTeleportFailed();
/**
* Update current location.
*
* Called when a teleport finishes.
* Called via callback set on the LLViewerParcelMgr "teleport finished" signal.
*
* Takes mRequestedItem into consideration: if it's not -1
* (i.e. user is teleporting to an arbitrary location, not to a history item)
* we purge forward items and append a new one, making it current. Otherwise
* we just modify mCurrentItem.
*
* @see mRequestedItem
* @see mGotInitialUpdate
*/
void updateCurrentLocation();
/**
* Invokes the "history changed" callback(s).
*/
void onHistoryChanged();
static std::string getCurrentLocationTitle();
/**
* Actually, the teleport history.
*/
slurl_list_t mItems;
/**
* Current position within the history.
*/
int mCurrentItem;
/**
* Requested position within the history.
*
* When a teleport succeeds, this is checked by updateCurrentLocation() to tell
* if this is a teleport within the history (mRequestedItem >=0) or not (-1).
*
* Set by goToItem(); reset by onTeleportFailed() (if teleport fails).
*
* @see goToItem()
* @see updateCurrentLocation()
*/
int mRequestedItem;
/**
* Have we received the initial location update?
*
* @see updateCurrentLocation()
*/
bool mGotInitialUpdate;
/**
* Signal emitted when the history gets changed.
*
* Invokes callbacks set with setHistoryChangedCallback().
*/
history_signal_t mHistoryChangedSignal;
/**
* Teleport success notification connection.
*
* Using this connection we get notified when a teleport finishes
* or initial location update occurs.
*/
boost::signals2::connection mTeleportFinishedConn;
/**
* Teleport failure notification connection.
*
* Using this connection we get notified when a teleport fails.
*/
boost::signals2::connection mTeleportFailedConn;
};
#endif
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