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/**
* @file llviewquery.h
* @brief Query algorithm for flattening and filtering the view hierarchy.
*
* Copyright (c) 2001-$CurrentYear$, Linden Research, Inc.
* $License$
*/
#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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