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virtual Glib::ustring * param_getTooltip() { return ¶m_tooltip; };
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// overload these for your particular parameter to make it provide knotholder handles or canvas helperpaths
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virtual void addKnotHolderEntities(KnotHolder */*knotholder*/, SPDesktop */*desktop*/, SPItem */*item*/) {}
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virtual void addKnotHolderEntities(KnotHolder */*knotholder*/, SPDesktop */*desktop*/, SPItem */*item*/) {};
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virtual void addCanvasIndicators(SPLPEItem */*lpeitem*/, std::vector<Geom::PathVector> &/*hp_vec*/) {};
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virtual void param_editOncanvas(SPItem * /*item*/, SPDesktop * /*dt*/) {};