[vwnc] Re-2: Re-2: Re-2: DragAndDrop with datasets

> Frank Urbach wrote:
> > The patch work for adjusting the width of the column very well. Thanks for
> > the fast response.
> > I have some trouble to reinstall the interface. To illustrate this the
> > following mehthod:
> >
> > MyApplicationModel>>reInstallInterface
> > "Install the receiver's user interface again. Keep the same window.
> > This happens when changing projects, restarting, and look and feel
> > changes."
> >
> > | spec window wid oldDate|
> >      
> >       oldDate := (builder componentAt: #datumSpinner) widget controller
> > text.
> > wid := builder componentAt: #datumSpinner.
> > self datumGiessplan removeDependent: wid widget.
> > builder composite removeComponent: wid.
> > window := self builder window.
> > window component release.
> >      
> >       window controller reInstallEventDispatcher.
> > builder := UIBuilder new.
> > builder setWindow: window.
> > builder source: self.
> > spec := self class interfaceSpecFor: #windowSpec.
> > self preBuildWith: builder.
> > builder add: spec.
> > self postBuildWith: builder.
> > builder doFinalHookup.
> > self postOpenWith: builder.
> >       window refresh.
> > ^builder
> >
> > When I do this I get a DNU
> > VisualPart>>graphicsContextFor: aVisualObject
> > "Forward the graphicsContextFor message up the hierarchy to find a
> > graphics context for aView."
> >
> > ^container graphicsContextFor: self
> >
> > is missing the container. Inspecting the container shows nil. This behavior
> > I recognize in the old DataSet when I use the option to show the
> > columnheader as a Button. After canceled this behavior in the GUI-Painter
> > this error goes away.
> > This is also far behind my knowledge.
> > And again many thanks for your response.
> >  
> Well.... #reInstallInterface is an abomination in general :-(
>
> If you look at the implementation of VisualLauncher>>reInstallInterface
> you'll see that it does:
>
> 1) remove a widget from the component hierarchy
> 2) ask the topComponent to #release all widgets (obviously except the
> one that was removed above).
> 3) build a new component hierarchy
> 4) swap one of the newly built widgets with the removed one above.
>
>
> If you look at your code you'll see that you keep the datumSpinner
> widget around but don't hook it up into the newly built UI (step 4).
> So I presume the datumSpinner (or its controller or model) is still
> dependent on something that changed. After the change it tries to
> repaint but since it is not sitting in a valid component hierarchy it DNUs.
>
>
>
> Just a guess, if this doesn't help please send a copy of the stack dump
> you get.
>
> R
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