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Diffstat (limited to 'indra/newview/llteleporthistory.h')
| -rw-r--r-- | indra/newview/llteleporthistory.h | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/indra/newview/llteleporthistory.h b/indra/newview/llteleporthistory.h new file mode 100644 index 0000000000..c68aabe9a1 --- /dev/null +++ b/indra/newview/llteleporthistory.h @@ -0,0 +1,224 @@ +/** + * @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; } + + /** + * 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 |