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#define GNM_SIMPLE_CANVAS(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj), GNM_SIMPLE_CANVAS_TYPE, GnmSimpleCanvas))
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GType gnm_simple_canvas_get_type (void);
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void gnm_simple_canvas_ungrab (FooCanvasItem *item, guint32 etime);
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int gnm_simple_canvas_grab (FooCanvasItem *item, unsigned int event_mask,