shizhoubo[OOoFrm] wrote:

> hi all,
> 
> I'm reading the "Using the Dispatch Framework" in OOo Developers Guide
> 7.1.6,
> I have two question about Dispatching a Command and Command URL.
> a.) Are all user action defined Command URL?

No, there are some actions that are executed directly. This is
unfortunate at least from one point of view: they can't be disabled or
intercepted easily.

> b.) What is the relationship between Command URL and Dispatching a
> Command? Are they one-one correspondence?

CommandURLs are used for command dispatching, status updating and UI
configuration files.

> c.) What value the com.sun.star.util.URL's Protocol should be in the OOo?

You can use any protocol you like. The "internal" UI elements of OOo's
applications all use the ".uno:" protocol. But the dispatch API allows
to dispatch any Command if a protocol handler is installed and
registered for the used protocol.

Besides the ".uno:" protocol some other "built in" protocols are
supported without installing any additional components:

"macro:"
"vnd.sun.star.script:"

and all protocols handed by a UCP (file,http,ftp etc.). Thus you can
open a file using Dispatch API. The difference between dispatching e.g.
a "file:" URL and using loadComponentFromURL() for the same URL is that
in the latter case no interaction is used while in case of dispatching
all interactive elements are used just like in the UI (that in fact also
uses dispatching to open documents). Interactions e.g. the password
dialog, error messages in case something goes wrong, update processes
etc. In case of loadComponentFromURL() they are not executed except if
advised differently, in case of dispatching it's the opposite.

If extensions with menu or toolbar entries are installed they usually
define and register their own protocols and protocol handlers. This
registration is based on a configuraion (xcu) file.

Ciao,
Mathias

-- 
Mathias Bauer (mba) - Project Lead OpenOffice.org Writer
OpenOffice.org Engineering at Sun: http://blogs.sun.com/GullFOSS
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