svalue: svalue
In gWidgets2: Rewrite of gWidgets API for Simplified GUI Construction

This returns the "selected" value in a widget (if applicable), or its main property. Selection varies from widget to widget, but should generally be what can be added to the widget by mouse click or typing. For some widgets, the extra argument index=TRUE will return the index of the selected value, not the value. For some widget, the argument drop is given to either prevent or encourage dropping of information.

Calls coerce_with when available. This value is a function and may be set as any property if the constructor does not explicity provide it.

This method sets the selected value of, or main property of the widget.

For gformlayout the svalue assigment method takes a named list and calls svalue<- on the children with matching names.

svalue(obj, index = FALSE, drop = NULL, ...)

## Default S3 method:
svalue(obj, index = NULL, drop = NULL, ...)

svalue(obj, index=NULL, ...) <- value

svalue(obj, index=NULL, ...) <- value

## S3 replacement method for class 'GFormLayout'
 svalue(obj, index=NULL, ...) <- value

`obj`	object of method call
`index`	NULL or logical. If `TRUE` and widget supports it an index, instead of a value will be returned.
`drop`	NULL or logical. If widget supports it, drop will work as it does in a data frame or perhaps someother means.
`...`	passed on to call
`value`	value to assign for selection or property

THe return value varies, depending if the widget is a "selection" widget or not. For non-selection widgets, the main property is loosely defined (the title of a window, text of a label or button, spacing of box containers, ...). For selection widgets the return value is the currently selected value. If no selection is made, this will be a 0-length vector with the expected class, if possible. For selection widgets, when index=TRUE, the value is an integer, possible 0-length when non selection is made.

gWidgets2 documentation built on Jan. 11, 2022, 1:07 a.m.