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#pragma once
#include "iselectiontest.h"
namespace selection
{
/**
* Selector implementation accepting a single selectable item (or none at all).
* In case mulitple selectables are considered, the one with the best intersection
* value is chosen.
*
* The selectable in question has to be currently selected to be accepted.
*/
class SingleItemSelector :
public Selector
{
private:
bool _selected;
SelectionIntersection _intersection;
ISelectable* _selectable;
public:
SingleItemSelector() :
_selected(false),
_selectable(nullptr)
{}
void pushSelectable(ISelectable& selectable) override
{
_intersection = SelectionIntersection();
_selectable = &selectable;
}
void popSelectable() override
{
if (_intersection.isValid())
{
_selected = true;
}
_intersection = SelectionIntersection();
}
void addIntersection(const SelectionIntersection& intersection) override
{
if (_selectable != nullptr && _selectable->isSelected())
{
_intersection.assignIfCloser(intersection);
}
}
// Returns true if this selector accepted a single selectable with a valid intersection
bool hasValidSelectable() const
{
return _selected;
}
ISelectable* getSelectable() const
{
return _selectable;
}
bool empty() const override
{
return !hasValidSelectable();
}
void foreachSelectable(const std::function<void(ISelectable*)>& functor) override
{
if (!empty())
{
functor(_selectable);
}
}
};
}
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