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static void sp_canvas_item_construct (SPCanvasItem *item, SPCanvasGroup *parent, gchar const *first_arg_name, va_list args);
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static int emit_event (SPCanvas *canvas, GdkEvent *event);
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static guint item_signals[ITEM_LAST_SIGNAL] = { 0 };
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* Registers the SPCanvasItem class with Glib and returns its type number.