[squeak-dev] What is the task of NullEncoder?

H. Hirzel hannes.hirzel at gmail.com
Fri Sep 29 13:21:50 UTC 2017


And there is no 'FlattenEncoder' in Pharo 6.


On 9/29/17, H. Hirzel <hannes.hirzel at gmail.com> wrote:
> We have
>
> NullEncoder
>     FlattenEncoder
>         Canvas
>
> there are no direct users of NullEncoder and FlattenEncoder.
>
> FlattenEncoder class comment is just
>
>     'The simplest possible encoding:  leave the objects as is.'
>
> a bit terse. Does not really say what the issue is about.
>
>
>
> On 9/29/17, H. Hirzel <hannes.hirzel at gmail.com> wrote:
>> P.S.
>>
>> There is no NullEncoder in Pharo.
>>
>> The class Canvas is not in a package 'Morphic-Support' but in a
>> package 'Graphics-Canvas'.
>>
>> There is no 'Graphics-Canvas' package in Squeak. [2]
>>
>> Seems like a good idea to move Canvas and subclasses to a package
>> 'Graphics-Canvas' as well.
>>
>>
>> [2] Graphics package in Squeak 6.0a-17405
>>
>> Graphics-Display Objects
>> Graphics-External-Ffenestri
>> Graphics-Files
>> Graphics-Fonts
>> Graphics-Primitives
>> Graphics-Text
>> Graphics-Transformations
>> GraphicsTests-Files
>> GraphicsTests-Primitives
>> GraphicsTests-Text
>>
>> On 9/29/17, H. Hirzel <hannes.hirzel at gmail.com> wrote:
>>> Hello
>>>
>>> NullEncoder is subclass of object ([1] for full hierachy). It is a
>>> superclass of Canvas.
>>>
>>> What is the function of NullEncoder. No class comment so far?
>>>
>>> Regards
>>> Hannes
>>>
>>>
>>> -------------------------------------------------------------------------------------------------------------------------------
>>>
>>> [1] NullEncoder printHierarchy '
>>> ProtoObject #()
>>> 	Object #()
>>> 		NullEncoder #(''target'' ''filterSelector'')
>>> 			FlattenEncoder #()
>>> 				ByteEncoder #()
>>> 					PrintableEncoder #()
>>> 						PostscriptEncoder #()
>>> 							PostscriptEncoderToDisk #()
>>> 						PropertyListEncoder #()
>>> 				Canvas #()
>>> 					ColorMappingCanvas #(''myCanvas'')
>>> 						AlphaBlendingCanvas #(''alpha'')
>>> 						ShadowDrawingCanvas #(''shadowColor'')
>>> 					FormCanvas #(''origin'' ''clipRect'' ''form'' ''port''
>>> ''shadowColor'')
>>> 						BalloonCanvas #(''transform'' ''colorTransform'' ''engine''
>>> ''aaLevel'' ''deferred'')
>>> 						BlueFormCanvas #()
>>> 						ColorPatchCanvas #(''stopMorph'' ''foundMorph'' ''doStop'')
>>> 						MultiResolutionCanvas #(''deferredMorphs'')
>>> 					PluggableCanvas #()
>>> 						BufferedCanvas #(''remote'' ''previousVersion'' ''lastTick''
>>> ''dirtyRect'' ''mirrorOfScreen'')
>>> 						CachingCanvas #(''cacheCanvas'' ''mainCanvas'')
>>> 						ClippingCanvas #(''canvas'' ''clipRect'')
>>> 						MultiCanvas #(''canvases'' ''extent'' ''depth'')
>>> 						NullCanvas #()
>>> 					PostscriptCanvas #(''origin'' ''clipRect'' ''currentColor''
>>> ''shadowColor'' ''currentFont'' ''morphLevel'' ''gstateStack''
>>> ''fontMap'' ''usedFonts'' ''psBounds'' ''topLevelMorph''
>>> ''initialScale'' ''savedMorphExtent'' ''currentTransformation''
>>> ''printSpecs'' ''pages'')
>>> 						DSCPostscriptCanvas #()
>>> 							DSCPostscriptCanvasToDisk #()
>>> 						EPSCanvas #()
>>> 					RemoteCanvas #(''innerClipRect'' ''outerClipRect'' ''transform''
>>> ''connection'' ''shadowColor'')'
>>>
>>
>


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