aaa3cccd89
on machines with networking completely turned off - added find-listener/port, which may be used in the future to enable networking explicitly (though erl.ss will need significant mods for that) - removed mention of distribution in README for demos (i.e., net-pong demo) - minor bug fix in gui wrapper - noted that spreadsheet is broken on MacOS svn: r3403
33 lines
1.3 KiB
Plaintext
33 lines
1.3 KiB
Plaintext
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This is an experimental spreadsheet to test FrTime and its GUI
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development capabilities. It is interesting because FrTime is used to
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implement the spreadsheet and as the language for cell formulas.
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Usage:
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To run the spreadsheet, open spread.ss in DrScheme, set the language level
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to (module ...), and execute.
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Select a cell by clicking the mouse or moving with the arrow
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keys. Press enter to focus the text entry field, where you can enter
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a FrTime expression. This includes purely functional Scheme and many
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common primitives. In a cell, you can refer to another cell by name.
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Entering the formula (+ a5 c7), including the parentheses, makes the
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value of the selected cell the sum of cells a5 and c7.
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It is also possible to refer to sequences of adjacent cells, which
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results in a list. For example, a1:5 returns a list containing the
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values of the cells a1 through a5.
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The spreadsheet can load and save files. For several of examples of
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spreadsheet formulas, including the use of behaviors, cell sequences,
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and absolute cell references, open demos.sheet.
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Known Bugs:
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- Initial evaluation of a cell formula is super slow.
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- Whole-screen redraw, as when scrolling or resizing, is super slow.
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- Errors arising during re-evaluation (not during initial evaluation) go
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to the DrScheme interactions window instead of propagating to the cell.
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- Does not work on MacOS
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