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#pragma once
#include "iselection.h"
#include "scenelib.h"
namespace scene
{
// Checks the current selection to see whether it consists of
// group nodes only.
class GroupNodeChecker :
public selection::SelectionSystem::Visitor
{
private:
mutable bool _onlyGroups;
mutable std::size_t _numGroups;
mutable scene::INodePtr _firstGroupNode;
public:
GroupNodeChecker() :
_onlyGroups(true),
_numGroups(0)
{}
void visit(const scene::INodePtr& node) const
{
if (!scene::hasChildPrimitives(node))
{
_onlyGroups = false;
}
else
{
_numGroups++;
if (!_firstGroupNode)
{
_firstGroupNode = node;
}
}
}
// Returns true if the current selection consists of group nodes only
// Returns false if any selected node is a non-group or if nothing is selected.
bool onlyGroupsAreSelected() const
{
return _numGroups > 0 && _onlyGroups;
}
// Returns the number of group nodes in the current selection
std::size_t selectedGroupCount() const
{
return _numGroups;
}
// Returns the first group node of the selection or NULL if nothing selected
scene::INodePtr getFirstSelectedGroupNode() const
{
return _firstGroupNode;
}
};
}
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