Because there's something really strange going on:
consider a modified version of ExpressionAssignCategory, say
AbstractExpressionAssignCategory, with these methods (which you see
delegates to the abstract method createStyledText)
@Override
protected void createClient(Composite parent) {
// The top
this.fEditorArea = getWidgetFactory().createComposite( parent );
this.fEditorArea.setLayout( new GridLayout());
// SKIPPED...
this.expressionText = createStyledText(editor);
this.expressionText.addModifyListener( new ModifyListener() {
@Override
public void modifyText( ModifyEvent e ) {
saveExpressionToModel();
}
});
}
/**
* @param styledTextComposite
* the Composite for the StyledText
* @return the created and configured StyledText based on an {@link
EmbeddedEditor}
*/
protected abstract StyledText createStyledText(Composite
styledTextComposite);
Now, if I write a concrete subclass with only the implementation of
createStyledText I get at some point this exception
java.lang.ClassCastException: org.eclipse.swt.layout.GridData cannot be
cast to org.eclipse.swt.layout.FillData
if I copy the inherited createClient in the subclass, everything works!
so I was wondering whether that methods was a hack due to something
misterious going on in the presence of subclasses?!
cheers
Lorenzo
On 10/15/2012 05:10 PM, Vincent Zurczak wrote:
> Hi lorenzo,
>
> Sorry, I cannot help on this.
> This is part of the legacy code of the editor.
>
> The original code was written for Eclipse 2.x.
> I am not even sure this workaround is required anymore.
>
> Regards,
>
> Vincent.
>
>
> Le 15/10/2012 16:52, Lorenzo Bettini a écrit :
>> Hi
>>
>> can anyone tell me the meaning of this method in ExpressionAssignCategory?
>>
>> /*
>> * (non-Javadoc)
>> * @see org.eclipse.bpel.ui.properties.ExpressionSection
>> * #createClient(org.eclipse.swt.widgets.Composite)
>> */
>> @Override
>> protected final void createClient(Composite parent) {
>> // ugly HACK to make subclasses work
>> //FlatFormLayout layout = new FlatFormLayout();
>> //layout.marginHeight = layout.marginWidth = 0;
>> //parent.setLayout(layout);
>> FillLayout fillLayout = new FillLayout();
>> fillLayout.marginHeight = fillLayout.marginWidth = 0;
>> parent.setLayout(fillLayout);
>> super.createClient(parent);
>> }
>>
>> I'm writing some subclasses and it looks like there are problems with
>> layout if I do not redefine this createClient method...
>>
>> thanks
>> Lorenzo
>
> --
> Vincent Zurczak
>
> Eclipse RCP Developer & Petals ESB Consultant
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>
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>
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