26 Mar
2015
26 Mar
'15
2:25 p.m.
Should or could the MADescriptionMorph hierarchy use/inherit-fro MAVisitor?
"Magritte Meta-Described Web Application Development" says "Custom
Rendering... Sometimes other layouts are more convenient, for example the
widgets should be laid out from left to right with the labels on top...
Magritte allows one to define one’s own builder by subclassing a Visitor and
overriding some of the methods used to place the user interface elements".
With the current implementation, it seems one would have to hack the
MADescriptionMorph classes themselves for that kind of change, but if a
visitor was used, they could just supply a custom visitor class, no?
-----
Cheers,
Sean
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26 Mar
26 Mar
9:46 p.m.
Sean P. DeNigris wrote
Should or could the MADescriptionMorph hierarchy
use/inherit-fro
MAVisitor?
I gave it a shot and think it worked out pretty well. A few methods and an
instVar removed from MAContainerMorph, in exchange two methods for a
pluggable visitor. The visitor(s) themselves are two MAVisitor subclasses
with 1 API method each, and one instVar with accessors.
Magritte-Morph-SeanDeNigris.89
[FEATURE]: MADescriptionMorphs use visitor pattern to allow customization
Simple Use Case: layout labels above field widgets instead of to the left
1. Subclass MAMorphicContainerVisitor, overriding #visitDescription:
2. Subclass MAContainerMorph, overriding #visitorClass supplying #1
3. In your domain class, override #descriptionContainer to send #morphClass:
iwith #2
Details:
- New MAMorphicVisitor build morphs for each of a MADescriptionMorph's
fields and add them to its morph
- Now you can easily override the building of different field types by
subclassing MAMorphicVisitor
- MAContainerMorph
- remove all #children related logic, as that work is now delegated to the
visitor
- custom visitor can be specified by overriding #visitorClass
-----
Cheers,
Sean
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28 Mar
28 Mar
10:26 a.m.
Could you compare this what we did with description builders in QCMagritte?
QCObject>>magritteDescription
|basicDescription builders|
basicDescription := self basicMagritteDescription.
builders := self magritteDescriptionBuilders.
builders ifNotNil: [^builders buildFrom: basicDescription target:
self].
^basicDescription
QCContainerComponent>>magritteDescription
^magritteDescription ifNil: [
| model builder |
builder := description descriptionBuilder.
builder ifNil: [ ^description].
model := self model.
magritteDescription := builder buildFrom: description target:
model model: self model model.
self setMemento: (model mementoClass model: model description:
magritteDescription).
magritteDescription ]
Stephan
On 26/03/15 14:25, Sean P. DeNigris wrote:
Should or could the MADescriptionMorph hierarchy
use/inherit-fro MAVisitor?
"Magritte Meta-Described Web Application Development" says "Custom
Rendering... Sometimes other layouts are more convenient, for example the
widgets should be laid out from left to right with the labels on top...
Magritte allows one to define one’s own builder by subclassing a Visitor and
overriding some of the methods used to place the user interface elements".
With the current implementation, it seems one would have to hack the
MADescriptionMorph classes themselves for that kind of change, but if a
visitor was used, they could just supply a custom visitor class, no?
-----
Cheers,
Sean
--
View this message in context: http://forum.world.st/Visitors-Underused-tp4815294.html
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_______________________________________________
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1:37 p.m.
Sure, I'm not yet sold on what I did. I feel like there's something I'm
missing but don't know yet what it is.
One thing is that it seems like MADescriptionMorph and friends should themselves be the
visitors, but currently they inherit from Model (I wonder if they have to).
Also, the visitor pattern should be able to handle both Seaside and Morphic, where right
now these are handled totally separately.
OTOH, I went back to Design Patterns, which says that Visitor is appropriate when the set
of operated-on classes is stable, but here anyone that wants to have a custom rendered
view (i.e. MyPianoMorph instead of a checkbox) would have to hunt around adding
#visitPianoDescription: methods to all the builders.
On Mar 28, 2015, at 5:17 AM, Stephan Eggermont [via Smalltalk]
<ml-node+s1294792n4815727h25(a)n4.nabble.com> wrote:
Could you compare this what we did with description
builders in QCMagritte?
QCObject>>magritteDescription
|basicDescription builders|
basicDescription := self basicMagritteDescription.
builders := self magritteDescriptionBuilders.
builders ifNotNil: [^builders buildFrom: basicDescription target:
self].
^basicDescription
QCContainerComponent>>magritteDescription
^magritteDescription ifNil: [
| model builder |
builder := description descriptionBuilder.
builder ifNil: [ ^description].
model := self model.
magritteDescription := builder buildFrom: description target:
model model: self model model.
self setMemento: (model mementoClass model: model description:
magritteDescription).
magritteDescription ]
Stephan
On 26/03/15 14:25, Sean P. DeNigris wrote:
-----
Cheers,
Sean
--
View this message in context:
http://forum.world.st/Visitors-Underused-tp4815294p4815747.html
Sent from the Magritte, Pier and Related Tools mailing list archive at Nabble.com.
Should or could the MADescriptionMorph hierarchy
use/inherit-fro MAVisitor?
"Magritte Meta-Described Web Application Development" says "Custom
Rendering... Sometimes other layouts are more convenient, for example the
widgets should be laid out from left to right with the labels on top...
Magritte allows one to define one’s own builder by subclassing a Visitor and
overriding some of the methods used to place the user interface elements".
With the current implementation, it seems one would have to hack the
MADescriptionMorph classes themselves for that kind of change, but if a
visitor was used, they could just supply a custom visitor class, no?
-----
Cheers,
Sean
--
View this message in context: http://forum.world.st/Visitors-Underused-tp4815294.html
Sent from the Magritte, Pier and Related Tools mailing list archive at Nabble.com.
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Stephan Eggermont