Reacting to an edit in Igor Pro

A SetVariable action fires on every kind of change, so check which one you got.

Function ThresholdChanged(STRUCT WMSetVariableAction &sva) : SetVariableControl
    if (sva.eventCode != 1 && sva.eventCode != 2)
        return 0
    endif

    NVAR threshold = root:Settings:gThreshold
    threshold = limit(sva.dval, 0, 10)

    Printf "threshold is now %g\r", threshold
    return 0
End

How it works

1. eventCode 1 is enter, 2 is arrows or mouse, 3 is a live edit.
2. sva.dval carries the number; sva.sval the string.
3. Returning zero is the convention; the value is ignored.

Keywords and builtins used here

• End
• Function
• NVAR
• Printf
• STRUCT
• endif
• if
• limit
• return

The run, in numbers

Lines

11

Characters to type

274

Tokens

54

Three-star pace

85 tpm

At the three-star pace of 85 tokens a minute, this run takes about 38 seconds.

Type this snippet

Step 2 of 5 in Values a user sets, step 5 of 18 in Panels & GUI.

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