path: root/indra/newview/llinventoryobserver.h

/**
 * @file llinventoryobserver.h
 * @brief LLInventoryObserver class header file
 *
 * $LicenseInfo:firstyear=2002&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#ifndef LL_LLINVENTORYOBSERVERS_H
#define LL_LLINVENTORYOBSERVERS_H

#include "lluuid.h"
#include <string>
#include <vector>

class LLViewerInventoryCategory;

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Class LLInventoryObserver
//
//   A simple abstract base class that can relay messages when the inventory
//   changes.
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
class LLInventoryObserver
{
public:
    // This enumeration is a way to refer to what changed in a more
    // human readable format. You can mask the value provided by
    // chaged() to see if the observer is interested in the change.
    enum
    {
        NONE            = 0,
        LABEL           = 1,    // Name changed
        INTERNAL        = 2,    // Internal change (e.g. asset uuid different)
        ADD             = 4,    // Something added
        REMOVE          = 8,    // Something deleted
        STRUCTURE       = 16,   // Structural change (e.g. item or folder moved)
        CALLING_CARD    = 32,   // Calling card change (e.g. online, grant status, cancel)
        GESTURE         = 64,
        REBUILD         = 128,  // Item UI changed (e.g. item type different)
        SORT            = 256,  // Folder needs to be resorted.
        CREATE          = 512,  // With ADD, item has just been created.
        // unfortunately a particular message is still associated with some unique semantics.
        UPDATE_CREATE   = 1024,  // With ADD, item added via UpdateCreateInventoryItem
        ALL             = 0xffffffff
    };
    LLInventoryObserver();
    virtual ~LLInventoryObserver();
    virtual void changed(U32 mask) = 0;
};

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Class LLInventoryFetchObserver
//
//   Abstract class to handle fetching items, folders, etc.
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
class LLInventoryFetchObserver : public LLInventoryObserver
{
public:
    LLInventoryFetchObserver(const LLUUID& id = LLUUID::null); // single item
    LLInventoryFetchObserver(const uuid_vec_t& ids); // multiple items
    void setFetchID(const LLUUID& id);
    void setFetchIDs(const uuid_vec_t& ids);

    bool isFinished() const;

    virtual void startFetch() = 0;
    virtual void changed(U32 mask) = 0;
    virtual void done() {};
protected:
    uuid_vec_t mComplete;
    uuid_vec_t mIncomplete;
    uuid_vec_t mIDs;
};

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Class LLInventoryFetchItemsObserver
//
//   Fetches inventory items, calls done() when all inventory has arrived.
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
class LLInventoryFetchItemsObserver : public LLInventoryFetchObserver
{
public:
    LLInventoryFetchItemsObserver(const LLUUID& item_id = LLUUID::null);
    LLInventoryFetchItemsObserver(const uuid_vec_t& item_ids);

    /*virtual*/ void startFetch();
    /*virtual*/ void changed(U32 mask);

    // For attempts to group requests if too many items are requested
    static const S32 MAX_INDIVIDUAL_ITEM_REQUESTS;
private:
    LLTimer mFetchingPeriod;

    /**
     * Period of waiting a notification when requested items get added into inventory.
     */
    static const F32 FETCH_TIMER_EXPIRY;
};

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Class LLInventoryFetchDescendentsObserver
//
//   Fetches children of a category/folder, calls done() when all
//   inventory has arrived.
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
class LLInventoryFetchDescendentsObserver : public LLInventoryFetchObserver
{
public:
    LLInventoryFetchDescendentsObserver(const LLUUID& cat_id = LLUUID::null);
    LLInventoryFetchDescendentsObserver(const uuid_vec_t& cat_ids);

    virtual void startFetch();
    /*virtual*/ void changed(U32 mask);
protected:
    bool isCategoryComplete(const LLViewerInventoryCategory* cat) const;
};

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Class LLInventoryFetchComboObserver
//
//   Does an appropriate combination of fetch descendents and
//   item fetches based on completion of categories and items. This is optimized
//   to not fetch item_ids that are descendents of any of the folder_ids.
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
class LLInventoryFetchComboObserver : public LLInventoryObserver
{
public:
    LLInventoryFetchComboObserver(const uuid_vec_t& folder_ids,
                                  const uuid_vec_t& item_ids);
    ~LLInventoryFetchComboObserver();
    /*virtual*/ void changed(U32 mask);
    void startFetch();

    virtual void done() = 0;
protected:
    LLInventoryFetchItemsObserver *mFetchItems;
    LLInventoryFetchDescendentsObserver *mFetchDescendents;
};

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Class LLInventoryMovedObserver
//
// This class is used as a base class for doing something when all the
// item for observed asset ids were added into the inventory.
// Derive a class from this class and implement the done() method to do
// something useful.
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

class LLInventoryAddItemByAssetObserver : public LLInventoryObserver
{
public:
    LLInventoryAddItemByAssetObserver() : mIsDirty(false) {}
    virtual void changed(U32 mask);

    void watchAsset(const LLUUID& asset_id);
    bool isAssetWatched(const LLUUID& asset_id);

protected:
    virtual void onAssetAdded(const LLUUID& asset_id) {}
    virtual void done() = 0;

    typedef std::vector<LLUUID> item_ref_t;
    item_ref_t mAddedItems;
    item_ref_t mWatchedAssets;

private:
    bool mIsDirty;
};

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Class LLInventoryAddedObserver
//
//   Base class for doing something when a new item arrives in inventory.
//   It does not watch for a certain UUID, rather it acts when anything is added
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
class LLInventoryAddedObserver : public LLInventoryObserver
{
public:
    LLInventoryAddedObserver() {}
    /*virtual*/ void changed(U32 mask);

protected:
    virtual void done() = 0;
};

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Class LLInventoryCategoryAddedObserver
//
//   Base class for doing something when a new category is created in the
//   inventory.
//   It does not watch for a certain UUID, rather it acts when anything is added
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
class LLInventoryCategoryAddedObserver : public LLInventoryObserver
{
public:

    typedef std::vector<LLViewerInventoryCategory*> cat_vec_t;

    LLInventoryCategoryAddedObserver() : mAddedCategories() {}
    /*virtual*/ void changed(U32 mask);

protected:
    virtual void done() = 0;

    cat_vec_t   mAddedCategories;
};

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Class LLInventoryCompletionObserver
//
//   Base class for doing something when when all observed items are locally
//   complete.  Implements the changed() method of LLInventoryObserver
//   and declares a new method named done() which is called when all watched items
//   have complete information in the inventory model.
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
class LLInventoryCompletionObserver : public LLInventoryObserver
{
public:
    LLInventoryCompletionObserver() {}
    /*virtual*/ void changed(U32 mask);

    void watchItem(const LLUUID& id);

protected:
    virtual void done() = 0;

    uuid_vec_t mComplete;
    uuid_vec_t mIncomplete;
};

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Class LLInventoryCategoriesObserver
//
// This class is used for monitoring a list of inventory categories
// and firing a callback when there are changes in any of them.
// Categories are identified by their UUIDs.
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
class LLInventoryCategoriesObserver : public LLInventoryObserver
{
public:
    typedef boost::function<void()> callback_t;

    LLInventoryCategoriesObserver() {};
    virtual void changed(U32 mask);

    /**
     * Add cat_id to the list of observed categories with a
     * callback fired on category being changed.
     *
     * @return "true" if category was added, "false" if it could
     * not be found.
     */
    bool addCategory(const LLUUID& cat_id, callback_t cb, bool init_name_hash = false);
    void removeCategory(const LLUUID& cat_id);

protected:
    typedef LLUUID digest_t; // To clarify the actual usage of this "UUID"
    struct LLCategoryData
    {
        LLCategoryData(const LLUUID& cat_id, const LLUUID& thumbnail_id, callback_t cb, S32 version, S32 num_descendents);
        LLCategoryData(const LLUUID& cat_id, const LLUUID& thumbnail_id, callback_t cb, S32 version, S32 num_descendents, const digest_t& name_hash);
        callback_t  mCallback;
        S32         mVersion;
        S32         mDescendentsCount;
        digest_t    mItemNameHash;
        bool        mIsNameHashInitialized;
        LLUUID      mCatID;
        LLUUID      mThumbnailId;
    };

    typedef std::map<LLUUID, LLCategoryData>    category_map_t;
    typedef category_map_t::value_type          category_map_value_t;

    category_map_t              mCategoryMap;
};

class LLFolderView;

// Force a FolderView to scroll after an item in the corresponding view has been renamed.
class LLScrollOnRenameObserver: public LLInventoryObserver
{
public:
    LLFolderView *mView;
    LLUUID mUUID;

    LLScrollOnRenameObserver(const LLUUID& uuid, LLFolderView *view):
        mUUID(uuid),
        mView(view)
    {
    }
    /* virtual */ void changed(U32 mask);
};


#endif // LL_LLINVENTORYOBSERVERS_H