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/**
* @file llviewquery.h
* @brief Query algorithm for flattening and filtering the view hierarchy.
*
* $LicenseInfo:firstyear=2001&license=viewergpl$
*
* Copyright (c) 2001-2007, 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://secondlife.com/developers/opensource/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://secondlife.com/developers/opensource/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_LLVIEWQUERY_H
#define LL_LLVIEWQUERY_H
#include <list>
#include "llmemory.h"
class LLView;
typedef std::list<LLView *> viewList_t;
typedef std::pair<BOOL, BOOL> filterResult_t;
// Abstract base class for all filters.
class LLQueryFilter : public LLRefCount
{
public:
virtual filterResult_t operator() (const LLView* const view, const viewList_t & children) const =0;
};
class LLQuerySorter : public LLRefCount
{
public:
virtual void operator() (LLView * parent, viewList_t &children) const;
};
class LLNoLeavesFilter : public LLQueryFilter, public LLSingleton<LLNoLeavesFilter>
{
/*virtual*/ filterResult_t operator() (const LLView* const view, const viewList_t & children) const;
};
class LLVisibleFilter : public LLQueryFilter, public LLSingleton<LLVisibleFilter>
{
/*virtual*/ filterResult_t operator() (const LLView* const view, const viewList_t & children) const;
};
class LLEnabledFilter : public LLQueryFilter, public LLSingleton<LLEnabledFilter>
{
/*virtual*/ filterResult_t operator() (const LLView* const view, const viewList_t & children) const;
};
class LLTabStopFilter : public LLQueryFilter, public LLSingleton<LLTabStopFilter>
{
/*virtual*/ filterResult_t operator() (const LLView* const view, const viewList_t & children) const;
};
// Algorithm for flattening
class LLViewQuery
{
public:
typedef std::list<const LLQueryFilter*> filterList_t;
typedef filterList_t::iterator filterList_iter_t;
typedef filterList_t::const_iterator filterList_const_iter_t;
LLViewQuery();
virtual ~LLViewQuery() {}
void addPreFilter(const LLQueryFilter* prefilter);
void addPostFilter(const LLQueryFilter* postfilter);
const filterList_t & getPreFilters() const;
const filterList_t & getPostFilters() const;
void setSorter(const LLQuerySorter* sorter);
const LLQuerySorter* getSorter() const;
viewList_t run(LLView * view) const;
// syntactic sugar
viewList_t operator () (LLView * view) const { return run(view); }
protected:
// override this method to provide iteration over other types of children
virtual void filterChildren(LLView * view, viewList_t & filtered_children) const;
filterResult_t runFilters(LLView * view, const viewList_t children, const filterList_t filters) const;
protected:
filterList_t mPreFilters;
filterList_t mPostFilters;
const LLQuerySorter* mSorterp;
};
class LLCtrlQuery : public LLViewQuery
{
public:
LLCtrlQuery();
};
#endif
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