update

Description:

public abstract void update (bool entire_tree, Context cr, CanvasBounds bounds)

This function is only intended to be used when implementing new canvas items, specifically container items such as CanvasGroup.

Updates the item, if needed, and any children.

this	a CanvasItem.
entire_tree	if the entire subtree should be updated.
cr	a cairo context.
bounds	a CanvasBounds to return the new bounds in.