[Cuis] Newbie question

Tue Mar 31 08:30:28 CDT 2015

Hi Hari,

(inline)

On 3/30/2015 11:22 AM, Hari Balaraman wrote:
> Hi Juan,
>
> Thanks very much for your comments. I will review your suggestions 
> asap. As a temporary solution, I copied PluggableScrollPane, renamed 
> it, and revised the initialize method (bypassing the instantiation of 
> innerMorph) thus:
>
> initialize: aMorphClass
>
> "initialize the state of the receiver"
> | n |
> super initialize.
> hideScrollBars _ false.
>
> "initialize the receiver's scrollBars"
> scrollBar _ self scrollBarClass new model: self setValueSelector: 
> #vScrollBarValue:.
> hScrollBar _ self scrollBarClass new model: self setValueSelector: 
> #hScrollBarValue:.
> drawKeyboardFocusIndicator _ true.
>
> n:=SystemWindow new.
> n addMorph:self.
> *"scroller _ self innerMorphClass new."
> *
> *scroller:=aMorphClass new.*
>
> scroller morphExtent:8000 at 8000.
> self addMorph: scroller.
> self scrollerOffset: 0@ 0.
> self addMorph: scrollBar.
> self addMorph: hScrollBar.
> n openInWorld.
>
> and a) deleted initialize, and b)set up dummy adjustExtent messages 
> within my embedded objects (and planned to tangle with adjustExtent 
> later…).
>
> Some comments:
>
> 1.I’ve spent a some time reviewing the LayoutMorph class examples and 
> have had a certain amount of difficulty in using them. I am using 
> squeak documentation whenever I am stuck in my efforts, so if layouts 
> are a marked departure from Squeak,I would like to request more 
> documentation (in class comments, faq wherever) on when/how layouts 
> are instantiated by objects and are used.

Have you read the class comments at LayoutSpec and LayoutMorph? In 
addition, LayoutMorph has an 'examples' class category. Try each one. 
Resize the top morph, and see layouts in action. inspect / explore the 
morphs, etc. Try to figure out what's happening. WRT when they are 
instantiated, check references to these classes. They are all there.

If something is not clear enough, please ask any questions. They will be 
useful to enhance this documentation.

>
> 2. One of the things I like about Cuis is the relative positioning of 
> morphs within containers. This has allowed me to build my (very 
> simple) UI without considering layouts.

Yep. That's the purpose of that. If you don't need automatic layout 
(maybe because your UI elements are all of fixed size), then just put 
them wherever you want them :)

> 3. Not having an intermediary layout layer has allowed me to easily 
> make calls to and from embedded objects within the containers in my 
> system (I considered a decoupled model and spent some time on a 
> version of the announcements framework which I imported from Squeak, 
> but, scattered documentation and various versions later, I have 
> abandoned that approach.) SystemWindow creates a LayoutMorph by 
> default. Looking up the hierarchy, I haven’t as yet, located where the 
> LayoutMorph instantiation behaviour occurs.

Browse LayoutMorph. Right click on it. Select 'class refs (N)'. See that 
there are two references from LayoutMorph from SystemWindow. Check 
senders of those methods. Isn't everything obvious?

> I would dearly love to get around LayoutMorphs by toggling a switch or 
> preference, and play puppeteer in a more direct fashion (I know, I 
> know, you are shaking your head in despair.)
>

:) I welcome you and everybody else to play and experiment. That's the 
realization of the "Personal Mastery" principle from Dan Ingalls 
("Design Principles behind Smalltalk"), and the whole purpose of Cuis. A 
Dynabook for me and for everybody.

Cheers,
Juan Vuletich

> Best regards,
>
> Hari
>
>
>> On Mar 30, 2015, at 8:51 AM, Juan Vuletich <juan at jvuletich.org 
>> <mailto:juan at jvuletich.org>> wrote:
>>
>> Hi Folks,
>>
>> On 3/28/2015 11:26 PM, Ken.Dickey wrote:
>>> On Sat, 28 Mar 2015 18:47:04 -0400
>>> "Phil (list)"<pbpublist at gmail.com <mailto:pbpublist at gmail.com>>  wrote:
>>>
>>>>> I’ve been looking up Squeak/Pharo/Cuis documentation on using layouts
>>>>> (which may be the issue) but have made little headway.
>>> Cuis layouts are different from Squeak or Pharo.  Given the changes 
>>> going on, many things require some code reading and playing around.
>>>
>>> To understand Layouts and LayoutSpecs, I did simple editors for 
>>> them.  They are located in the Morphic-Misc1 package at:
>>> https://github.com/KenDickey/Cuis-Smalltalk-Morphic-Misc1
>>>
>>> From the readme:
>>> "
>>> After loading this package, one can select a morph, open its menu 
>>> from the halo, and edit its LayoutSpec.
>>> If the morph is a LayoutMorph, one can also open an editor for the 
>>> LayoutMorph from the halo menu.
>>> "
>>>
>>> Inspecting the window submorphs should help as well.
>>>
>>> Cheers,
>>> -KenD
>>
>> Hari, you were really close. Unfortunately, a bug in Cuis made it 
>> harder than needed. Besides trying Ken suggestion, also do the following:
>>
>> 1) Change #addToScroller: to read
>> addToScroller: aMorph
>>
>>    scroller
>>        addMorph: aMorph position: 0 at 0;
>>        morphExtent: aMorph morphExtent
>>
>> (just found a bug. This fix will be on GitHub soon)
>>
>> 2) Take a look at #inATwoWayScrollPane. Try the comment:
>>
>> (EllipseMorph new morphExtent: 500 at 270) inATwoWayScrollPane openInHand
>>
>> 3) Change your code to read:
>> mArea := ( DragAndDropAreaMorph new color: Color white) inspect 
>> openInWorld.
>> scrollpane := (PluggableScrollPane new color: Color red) openInWorld .
>> scrollpane inspect.
>> gWindow := SystemWindow new.
>> gWindow addMorph: scrollpane.
>>
>> mArea morphExtent: 800 at 800.
>> scrollpane addToScroller: mArea.
>>
>> qEllipse := EllipseMorph new.
>> mArea addMorph: qEllipse.
>> qEllipse morphPosition: 200 at 500.
>>
>> gWindow openInWorld
>>
>> The change was to set the mArea extent prior to adding to the 
>> scroller.... Maybe we'd make InnerPluggableMorph>>#adjustExtent work! 
>> If you keep playing with this, and find out whow you think it should 
>> behave, please send us your code, for integration.
>>
>> Cheers,
>> Juan Vuletich
>>
>>
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>
>
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