[webkit-dev] How to determine the " could cut " status ?

[Andy]

Hi, all,
When I select a whole page, I could copy and paste it to other place.
But most of the time I select a page, I'm not allowed to cut it  since
the browser does not permit it.  So how could I query the status to
determine whether I could copy or cut ?
Is there any API method I could use ? Or I should judge it by myself ?
 Anybody could give a hint ?
Thanks so much.


Best Regards.
Andy