[brailleblaster] Re: How do I get this notifyListeners addListener to work?
- From: "John J. Boyer" <john.boyer@xxxxxxxxxxxxxxxxx>
- To: brailleblaster@xxxxxxxxxxxxx
- Date: Wed, 15 Jun 2011 21:43:08 -0500
Chris,
What I am doing is setting up a Milti-document Inteface (MDI) framework.
This is something that will be wanted eventually, and I am quite sure
that the it will be easier if the framework is present early on. It
doesn't seem like it should be diffiecult. The WPManager keeps a list of
active documents, which are embodied in instances of DocumentManager.
The user can move amonng the doucuments, as in any word processor. The
request for another document will come from an item in BBMenu, which is
a chile of the active DocumentManager. The new document should not
itself be a child of this DocumentManager. it should be a child of
WPManager. So It seemed to me that the ntural way to do this would be to
send on OpenDocument event, which woudl be caught by an OpenDocument
listener in WPManager. Is this your understanding? Are you trying to
make things easier for me at this point? That will probably produce much
more difficulty down the road. In any case, I need to master the
event-listener technique.
I've never been able to get much out of the swt examples page, even in
IE. Instead of just giving links to the examples they want me to go to
the downloads page and then find the examples. I must confess that I'm
really bad at finding anything on the Web.
Another thing I would like to find is a zip file like those for SWT, for
Jface, which contains both source code and a jar.
I don't want to give the impression of being a complainer, but it seems
to me that the Eclipse sites are downright unfriendly. What are they
thinking of?
John
On Wed, Jun 15, 2011 at 07:04:20PM -0700, Chris von See wrote:
> If I understand what you're doing correctly, you seem to be making
> this more complicated than it needs to be. You may want to take a
> look at the SWT example code available from
> http://www.eclipse.org/swt/examples.php - there are some pretty nice
> non-Eclipse demo programs there that can help you decide how best to
> structure the application.
>
>
> Cheers,
> Chris
>
>
> On Jun 15, 2011, at 5:33 PM, John J. Boyer wrote:
>
> >Yes, I have SelectionListeners on all menu items. When the Opeen,
> >New or
> >Import item is selected the listener calls the sendOpenEvent method in
> >the DocumentManager, with an int parameter specifyingthe action to be
> >taken. This method creates an instance of Event and places the
> >parameter
> >in the detail field. It then calls notifyListeners on the
> >DocumentManager's Shell with SWT.OpenDocument and the event.
> >
> >When it started, WPManager used addListener on the Display, which is
> >the
> >only SWT class it has, to add a listener for the OpenDocument event.
> >The
> >handleEvent method in this listener calls the addDocument method in
> >the
> >WPManager. This creates a new instance of DocumentManager and adds
> >it to
> >the ArrayList of active documents. However, this never happens.
> >
> >It is not necessary to generate an event for the Close menu selection,
> >since this process occurs entirely withing the DocumentManager. The
> >listener merely sets an exitSelected boolean to true. The normal event
> >loop also tests the value of this boolean, and if it is true the
> >DocumentManager does what is necessary to close the document and
> >exits.
> >The addDocument method in the WPManager, which created this instance
> >of
> >DocumentManager then sets its reference in the list of active
> >documents
> >to null, so the garbage collector can dispose of it, and then removes
> >the reference from the list of active documents.
> >
> >John
> >
> >dreats
> >an instan
> >On Wed, Jun 15, 2011 at 04:05:56PM -0700, Chris von See wrote:
> >>I'm not sure I completely understand what you did, but what I've done
> >>in the past is add a SelectionListener to the "Open..." menu item.
> >>The listener gets called when the user selects that menu item; you
> >>can
> >>then create and open a file dialog to allow the user to select the
> >>file and create your XOM tree, views, etc. You can also use a
> >>SelectionListener on a "Close" menu item to close the active document
> >>and free resources.
> >>
> >>Cheers
> >>Chris
> >>
> >>
> >>
> >>On Jun 15, 2011, at 3:47 PM, John J. Boyer wrote:
> >>
> >>>In the design for the word processor that I have come up with, it is
> >>>entered by a call to WPManager from somewhere, the main mehtod now.
> >>>WPManager creates an instance of DocumentManager which creates
> >>>instances
> >>>of BrailleView, SaisyView, BBMenu BBToolbar and BstatusBar.
> >>>DocumentManager handles everything relating to a single document.
> >>>When
> >>>the user choses the Open, New or Import items on the menu it calls
> >>>notifyListeners on its Shell. WPmanager has previously registered a
> >>>listener for the IpenDocument event on the display. The listener is
> >>>supposed to call a method which creates a new document and adds it
> >>>to an
> >>>ArrayList of documents. However, the listener never hears anything.
> >>>What
> >>>is wrong?
> >>>
> >>>Thanks,
> >>>John
> >>>
> >>>--
> >>>John J. Boyer; President, Chief Software Developer
> >>>Abilitiessoft, Inc.
> >>>http://www.abilitiessoft.com
> >>>Madison, Wisconsin USA
> >>>Developing software for people with disabilities
> >>>
> >>>
> >>
> >
> >--
> >John J. Boyer; President, Chief Software Developer
> >Abilitiessoft, Inc.
> >http://www.abilitiessoft.com
> >Madison, Wisconsin USA
> >Developing software for people with disabilities
> >
> >
>
--
John J. Boyer; President, Chief Software Developer
Abilitiessoft, Inc.
http://www.abilitiessoft.com
Madison, Wisconsin USA
Developing software for people with disabilities
Other related posts:
