[squeak-dev] Proposal: Morphs in Text
marcel.taeumel at hpi.de
Mon Jun 24 12:22:36 UTC 2019
> Regarding the layout glitch: it is not related to the changeset. It is related to Morph>>#imageForm using #fullBounds. We are using a layoutPolicy for the Morph in the example method and this seems to cause issues as the full sizes of the text morphs are not known yet. Consequently, full bounds is very large and thus the imageForm looks weird. For example, the issue does not occur when doing two imageForm calls after another.
That's correct. The interference between text layouting and morph layouting is not related to this change. That's an older bug in Morphic's general layouting mechanism, which does not care about morphs only having a height after getting a specific width. Or the other way round.
For clarification: I just used #imageForm to illustrate the bug. Noticable flickering occurs in your example without calling #imageForm because regular drawing uses #fullBounds, too.
Am 24.06.2019 13:59:49 schrieb patrick.rein at hpi.uni-potsdam.de <patrick.rein at hpi.uni-potsdam.de>:
please find attached an updated version of the Morphs in Text changeset. I consider this a final version, which I would like to merge into trunk.
In comparison to the previous changeset it now includes deprecated methods, an extended text anchor menu, and some more comments.
Regarding the layout glitch: it is not related to the changeset. It is related to Morph>>#imageForm using #fullBounds. We are using a layoutPolicy for the Morph in the example method and this seems to cause issues as the full sizes of the text morphs are not known yet. Consequently, full bounds is very large and thus the imageForm looks weird. For example, the issue does not occur when doing two imageForm calls after another.
>> Should we deprecate the old text anchor property methods on Morph or directly remove them?
>+1 for deprecation first, removal later.
>> Do we want a more extensive text anchor menu?
>> Would it be fine to implement the menu creation logic on the TextAnchorProperties class?
>I think, it would be okay. TextAnchor and TextAnchorProperties are additions from Morphic to the base system (i.e., Collections and Graphics). Yet, it could be kind of misleading for later to also add menu logic to other, non-morphic, text attributes. Hm...
>Could you update (or extend) the commentary for the following methods?
>TextMorphForEditView >> #defaultTextModificationCharacterSetTextAttribute >> #writeScanOn:
>Thanks for working on this. All TextAnchorTest tests pass (or fail as expected ;P).
>I noticed a little layout glitch in the TextAnchor alignmentExamples. You can see it if you do "demoMorph imageForm asMorph openInHand" instead of "openInWorld". Is this new?
>Am 11.06.2019 17:06:28 schrieb patrick.rein at hpi.uni-potsdam.de :Please find the correct change set in this mail... :)
>>Hi everyone :)
>>please find attached a new version of the repaired/improved morph in text support :)
>>This changeset includes:
>>- less strict treatment of the start of header character so that binary files should display correctly again
>>- refactored the text anchor properties into a separate object which every morph can have as an extension
>>- removed the partially implemented #paragraph layouting style and finished the #inline and #document layouting styles
>>- added basic support for vertical padding
>>- Examples! (Execute TextAnchor alignmentExamples)
>>- improved and added tests
>>Please try it out! :) Feedback is very welcome :)
>>Questions I still have are
>>- Do we want a more extensive text anchor menu? Currently, only the layout style is accessible through the menu. Would it be fine to implement the menu creation logic on the TextAnchorProperties class?
>>- Should we deprecate the old text anchor property methods on Morph or directly remove them?
>>The major missing aspect is some more documentation on TextAnchor.
>>>thanks Nicolas and Subbu for the answers.
>>>I did not think about the concept of a morph having a baseline too but it sounds like a good idea. I'll try to accomodate it in the new alignment logic.
>>>Given that we interpret the textAnchorType as the floating behavior, we would end up with:
>>>#inline: Inline the text flow
>>>#paragraph: The morph is displayed on its own line (_Not_ the semantic of having a morph within a chain of TextMorphs)
>>>#document: The morph can be placed freely within the document and is neither influenenced by the text flow, nor does it influence the text flow
>>>If that sounds about right I would go on to implement the behavior like that, as it currently does not really work like that. In the course of that it might make sense to rename textAnchorType so something else.
>>>Based on Subbus comment I will also move the new properties and methods on morphs into a class TextAnchorProperties which will then be referenced by a morph. This should actually make the morph interface smaller than it is right now.
>>>>i did not have time to inquire about the .cs but I can partially answer
>>>>Le mar. 28 mai 2019 ࠱8:27, a 飲it :
>>>>please find attached a change set which includes:
>>>>1.) Some fixes to the Scanner infrastructure to support Morphs in Text better
>>>>2.) Improvements to describe how a Morph should be aligned with regard to the text. Relevant methods on Morph are:
>>>>You can see an example by executing the body of the test:
>>>>!Warning: As this touches Scanner code a lot, loading this change set might make your image unresponsive!
>>>>I would like to point out that the test cases are preliminary and a few of the methods still require polishing. Nevertheless, I would like to ask for comments on the change set, in particular regarding:
>>>>1.) Should the alignment information be stored in the Morph or the TextAnchorAttribute? Currently the information is stored in the Morph which parallels LayoutProperties.
>>>>I think it should be in Morph, because Morph can have its own notion of baseline etc... (imagine for example that I want to render a FractionMathMorph 1/(1/x+1), then I want the main (upper) fraction bar to be somehow aligned with the text baseline)If Morph does not carry such information, then we can wrap in another Morph that does (but I'm not sure that's how Morph works currently...)
>>>>2.) Is using caseOf: in Scanner code fine? I suspect it to be quite expensive which is probably not a good thing in Scanners?
>>>>unless you have thousands of Morphs, you won't be able to measure any difference
>>>>3.) Should the cursor allow users to navigate (or select?) the "start of header" character that is used to denote the text anchor placement?
>>>>If Morph is aligned with text (renderd as if a single character), then i would expect so (so as to be able to copy/paste for example)
>>>>4.) Does anyone remember / know what the textAnchorType was intended for? The previous implementation largely ignored it and this one does so too.
>>>>I guess it could be like classical editors: Morph aligned with text (as a single character) or super-imposed over text, or text wraps around the morph, or ...
>>>>Thanks and best wishes,
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