[squeak-dev] Proposal: Morphs in Text

patrick.rein at hpi.uni-potsdam.de patrick.rein at hpi.uni-potsdam.de
Tue May 28 16:18:21 UTC 2019

Hi everyone,

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.
2.) Is using caseOf: in Scanner code fine? I suspect it to be quite expensive which is probably not a good thing in Scanners?
3.) Should the cursor allow users to navigate (or select?) the "start of header" character that is used to denote the text anchor placement?
4.) Does anyone remember / know what the textAnchorType was intended for? The previous implementation largely ignored it and this one does so too.

Thanks and best wishes,
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