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< 
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> 	 * Note, a valid view must be present in order for the tool to accept activation
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< 	public DrawingView view();
---
> 	public boolean isUsable();
> 
> 	public DrawingEditor editor();
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> 	
> 	public void addToolListener(ToolListener newToolListener);
> 	public void removeToolListener(ToolListener oldToolListener);