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[Preferences] FieldEditor.dispose() not called by FieldEditorPreferencePage [message #650938]

Thu, 27 January 2011 03:45

Eclipse User

I just stumbled across the following problem in my own FieldEditor
implementation (Eclipse 3.6.1) where I override the dispose function:
This function is never called by the embedding
FieldEditorPreferencePage. This seems curious, because
FieldEditorPreferencePage was specifically designed to ease the creation
of typical standard preference pages. FieldEditorPreferencePage already
controls the life-cycle of the hosted FieldEditors by resetting (pe
being a FieldEditor)

pe.setPage(null);
pe.setPropertyChangeListener(null);
pe.setPreferenceStore(null);

but does not invoke pe.dispose(). It seems to me that either the
dispose() function within the FieldEditor was a design error or that
FieldEditorPreferencePage should call pe.dispose() in it's own dispose()
function - I tend to prefer the latter.

I would like to wait for some comments that might explain the current
state before submitting a defect report.

Thanks for any input & Greetings from Bremen,

Daniel Krügler

Re: [Preferences] FieldEditor.dispose() not called by FieldEditorPreferencePage [message #651145 is a reply to message #650938]

Thu, 27 January 2011 19:25

Eclipse User

Sorry, didn't have the time for looking into this in more detail. But I remember having seen a similar problem in a composite inside a ScrolledComposite within a TabItem located within an EditorPart. So maybe the cause of this is not be the preference page itself but a composite it incorporates.

Re: [Preferences] FieldEditor.dispose() not called by FieldEditorPreferencePage [message #651167 is a reply to message #651145]

Fri, 28 January 2011 01:42

Eclipse User

On 2011-01-28 01:25, Carsten Habicht wrote:
> Sorry, didn't have the time for looking into this in more detail. But I
> remember having seen a similar problem in a composite inside a
> ScrolledComposite within a TabItem located within an EditorPart. So
> maybe the cause of this is not be the preference page itself but a
> composite it incorporates.

What I'm noting here is not only an observation of a particular
code-example that does not work: I analyzed the complete interaction of
FieldEditors and FieldEditorPreferencePage (which is not much of code)
and the clear outcome that the hosting preference page does *never* call
FieldEditor.dispose() at all.

My understanding is, that you have a different example in mind:
FieldEditor itself is no control or composite (in fact it does not
refine or implement any base class or interface), so I don't see the
relation to composites here. FieldEditorPreferencePage contains an
internal (private) List of FieldEditors and does not provide a single
choice to the remaining JFace API to reference the contained editors.
This means, that FieldEditorPreferencePage is the one and only one
responsible container for FieldEditors.

Greetings from Bremen,

- Daniel Krügler

Re: [Preferences] FieldEditor.dispose() not called by FieldEditorPreferencePage [message #651264 is a reply to message #651167]

Fri, 28 January 2011 11:18

Eclipse User

Daniel KrÃ¼gler wrote on Fri, 28 January 2011 01:42

My understanding is, that you have a different example in mind:
FieldEditor itself is no control or composite (in fact it does not
refine or implement any base class or interface), so I don't see the
relation to composites here.

You're right. I thought that a FieldEditorPreferencePage is or references some sort of composite, containing FieldEditor controls.

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