alice-teacher Alice 2 expression dragging

[Donald Slater]

That is interesting… To be honest, I was not even aware that you could copy it to the clipboard… I am wondering if the direct copy / move of the expression is prevented because of the complexity of checking the validity of the types? Copying from the clipboard already has the type-checking built in? I was not around for the implementation decision, so I cannot speak knowledgeably, but that is the best guess that I have at the moment. I will let you know if I learn anything else…

And because I am curious, I checked this in Alice 3, and Alice 3 does not even allow copying of expressions to the clipboard. Any attempt to do so copies the entire statement.

Thank you for pointing this out.

All the best,
Don Slater

> On Jan 31, 2017, at 12:02 PM, Vanderhyde, James via alice-teachers <alice-teachers at lists.andrew.cmu.edu <mailto:alice-teachers at lists.andrew.cmu.edu>> wrote:
> 
> I was demonstrating expressions in class today, and I discovered that you can’t drag an expression from one statement to another statement, but you can drag an expression from a statement to the clipboard and from the clipboard to a statement. This seems inconsistent. I tried Windows and Mac (see screenshots). Is this desired behavior?
> 
> James
> —
> James Vanderhyde
> Assistant Professor, Computer Science
> Program Director, Master of Applied Computer Science
> Saint Xavier University
> 3700 W. 103rd St.
> Chicago, IL 60655
> 773-298-3454
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