| Handling focus change in a FormPage [message #334979] |
Fri, 13 March 2009 10:57  |
Eclipse User |
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Originally posted by: eclipse-news.rizzoweb.com
In order to enable/disable the global cut/copy/paste actions, I need to
be able to detect when any Text gains focus in any FormPage in any of my
FormEditor classes.
I looked at the PDEFormEditor and its associated classes for a hint on
how to accomplish this, and it looks like they use a special wrapper
around all Text widgets that registers a FocusListner. That is not a
good option for me because a) our editors are already written and
retro-fitting them like that would be a pretty big piece of work, and b)
I find that to be too error-prone; if someone adds a new Text and
doesn't realize they should have used the wrapper, it won't contribute
correctly.
My first attempt at a solution was to add a hook in my
BaseFormPage.createPartControl() that registers a FocusListener on all
Text children after they've been created. That works for most cases, but
if a FormPage has a MasterDetailsBlock [or any other situation where
nested Controls are created dynamically after createPartControl()], it
fails to include the dynamically-created Texts.
My only other idea is to add a Display-level filter Listener on
SWT.FocusIn and SWT.FocusOut events. I'm not sure if that is going to be
a performance problem since, for each event, I have to determine if the
widget gaining focus is in one of my FormPage instances or not.
Any thoughts on those solutions or some alternative way of
enabling/disabling the cut/copy/paste actions in a custom FormEditor?
Thanks in advance,
Eric
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| Re: Handling focus change in a FormPage [message #335023 is a reply to message #334979] |
Mon, 16 March 2009 22:55  |
| Eclipse User |
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Originally posted by: bvitale.alumni.unh.edu
You may be able to define a command handler for those commands, which is
only active when your controls have focus.
See:
http://help.eclipse.org/ganymede/topic/org.eclipse.platform. doc.isv/guide/workbench_cmd_handlers.htm
ISources#ACTIVE_FOCUS_CONTROL_ID_NAME
IFocusService#addFocusTracker(Control control, String id)
Hope that helps
Ben
Eric Rizzo wrote:
> In order to enable/disable the global cut/copy/paste actions, I need to
> be able to detect when any Text gains focus in any FormPage in any of my
> FormEditor classes.
> I looked at the PDEFormEditor and its associated classes for a hint on
> how to accomplish this, and it looks like they use a special wrapper
> around all Text widgets that registers a FocusListner. That is not a
> good option for me because a) our editors are already written and
> retro-fitting them like that would be a pretty big piece of work, and b)
> I find that to be too error-prone; if someone adds a new Text and
> doesn't realize they should have used the wrapper, it won't contribute
> correctly.
> My first attempt at a solution was to add a hook in my
> BaseFormPage.createPartControl() that registers a FocusListener on all
> Text children after they've been created. That works for most cases, but
> if a FormPage has a MasterDetailsBlock [or any other situation where
> nested Controls are created dynamically after createPartControl()], it
> fails to include the dynamically-created Texts.
> My only other idea is to add a Display-level filter Listener on
> SWT.FocusIn and SWT.FocusOut events. I'm not sure if that is going to be
> a performance problem since, for each event, I have to determine if the
> widget gaining focus is in one of my FormPage instances or not.
>
> Any thoughts on those solutions or some alternative way of
> enabling/disabling the cut/copy/paste actions in a custom FormEditor?
>
> Thanks in advance,
> Eric
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| Re: Handling focus change in a FormPage [message #335243 is a reply to message #335013] |
Fri, 27 March 2009 10:40 |
| Eclipse User |
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Originally posted by: eclipse-news.rizzoweb.com
On 3/16/2009 12:35 PM, Vel wrote:
> The FocusListener you have seen in PDEFormEditor is to remember the
> control that had the focus when the page lost focus. FormPage.setFocus()
> is called when a page is activated and lastFocusControl is used to set
> the focus again. This is smart. I followed the logic for my editor pages
> and found it to work in the same way, but I have not figured out how
> they remember controls of DetailsPage. We should give a thumbs up to PDE
> folks for this good usability.
I would, except it does not always work very well. When I swtich away
from a plugin editor Extensions tab, for example, and then switch back,
it usually does not correctly remember which node in the tree I had
selected. It is actually quite irritating.
>
> As far as implementing global actions, look at its
> EditorActionContributor. Do not forget to register the actions. There is
> also a FAQ -
> http://wiki.eclipse.org/FAQ_How_do_I_hook_into_global_action s%2C_such_as_Copy_and_Delete%3F.
>
>
> Post back your results. My team struggled to make the global actions
> work because of simple mistakes.
I'm already there; the problem I have now is enabling and disabling my
actions at the right time, based on what widget has focus.
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