You can use the 4D formula editor with the EDIT FORMULA command.
I don't use 4D Write, but I implemented the formula editor for styled text
fields (used to implement a markdown editor).
Editing (by double click) or inserting a formula is something like this:
GET HIGHLIGHT(*;$edName;$start;$end)
Case of
: ($start=$end)
: (ST Get content type(*;$edName)=ST Expression type) //Formula is selected.
$formula:=ST Get expression(*;$edName)
End case
If ($formula#"")
$formula:=UI_Formula_editor ($formula)
If ($formula#"")
ST INSERT EXPRESSION(*;$edName;$formula;$start;$end)
HIGHLIGHT TEXT(*;$edName;$start;$start+1)
End if
End if
John DeSoi, Ph.D.
> On Oct 9, 2018, at 11:50 AM, David Ringsmuth via 4D_Tech
> <[email protected]> wrote:
>
> Insert expression and Get expression seem to not be pre-implemented in the 4D
> v17 Write Pro area.
>
> The documentation indicates this should be managed by the developer, along
> with “Allowed Methods”.
>
> I think the UI for this provide access to allowed tables, fields, methods and
> commands.
>
> If you have already implemented this for a 4D WP area, would you be willing
> to share how you did it?
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