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/**
* @file llviewquery.h
* @brief Query algorithm for flattening and filtering the view hierarchy.
*
* $LicenseInfo:firstyear=2001&license=viewerlgpl$
* 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_LLVIEWQUERY_H
#define LL_LLVIEWQUERY_H
#include <list>
#include "llsingleton.h"
#include "llui.h"
class LLView;
typedef std::list<LLView *> viewList_t;
typedef std::pair<bool, bool> filterResult_t;
// Abstract base class for all query filters.
class LLQueryFilter
{
public:
virtual ~LLQueryFilter() {};
virtual filterResult_t operator() (const LLView* const view, const viewList_t & children) const = 0;
};
class LLQuerySorter
{
public:
virtual ~LLQuerySorter() {};
virtual void sort(LLView * parent, viewList_t &children) const;
};
class LLLeavesFilter : public LLQueryFilter, public LLSingleton<LLLeavesFilter>
{
LLSINGLETON_EMPTY_CTOR(LLLeavesFilter);
/*virtual*/ filterResult_t operator() (const LLView* const view, const viewList_t & children) const;
};
class LLRootsFilter : public LLQueryFilter, public LLSingleton<LLRootsFilter>
{
LLSINGLETON_EMPTY_CTOR(LLRootsFilter);
/*virtual*/ filterResult_t operator() (const LLView* const view, const viewList_t & children) const;
};
class LLVisibleFilter : public LLQueryFilter, public LLSingleton<LLVisibleFilter>
{
LLSINGLETON_EMPTY_CTOR(LLVisibleFilter);
/*virtual*/ filterResult_t operator() (const LLView* const view, const viewList_t & children) const;
};
class LLEnabledFilter : public LLQueryFilter, public LLSingleton<LLEnabledFilter>
{
LLSINGLETON_EMPTY_CTOR(LLEnabledFilter);
/*virtual*/ filterResult_t operator() (const LLView* const view, const viewList_t & children) const;
};
class LLTabStopFilter : public LLQueryFilter, public LLSingleton<LLTabStopFilter>
{
LLSINGLETON_EMPTY_CTOR(LLTabStopFilter);
/*virtual*/ filterResult_t operator() (const LLView* const view, const viewList_t & children) const;
};
class LLCtrlFilter : public LLQueryFilter, public LLSingleton<LLCtrlFilter>
{
LLSINGLETON_EMPTY_CTOR(LLCtrlFilter);
/*virtual*/ filterResult_t operator() (const LLView* const view, const viewList_t & children) const;
};
template <class T>
class LLWidgetTypeFilter : public LLQueryFilter
{
/*virtual*/ filterResult_t operator() (const LLView* const view, const viewList_t & children) const
{
return filterResult_t(dynamic_cast<const T*>(view) != NULL, true);
}
};
// 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() : mPreFilters(), mPostFilters(), mSorterp() {}
virtual ~LLViewQuery() {}
void addPreFilter(const LLQueryFilter* prefilter) { mPreFilters.push_back(prefilter); }
void addPostFilter(const LLQueryFilter* postfilter) { mPostFilters.push_back(postfilter); }
const filterList_t & getPreFilters() const { return mPreFilters; }
const filterList_t & getPostFilters() const { return mPostFilters; }
void setSorter(const LLQuerySorter* sorter) { mSorterp = sorter; }
const LLQuerySorter* getSorter() const { return mSorterp; }
viewList_t run(LLView * view) const;
// syntactic sugar
viewList_t operator () (LLView * view) const { return run(view); }
// override this method to provide iteration over other types of children
virtual void filterChildren(LLView * view, viewList_t& filtered_children) const;
private:
filterResult_t runFilters(LLView * view, const viewList_t children, const filterList_t filters) const;
filterList_t mPreFilters;
filterList_t mPostFilters;
const LLQuerySorter* mSorterp;
};
#endif // LL_LLVIEWQUERY_H
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