objectSignals (version 0.9.1)

signalingFields: Signaling Fields

Description

Convenience function for defining a set of reference class fields that signals when set.

Usage

signalingFields(fields, signalName="changed")

Arguments

fields

list of names of the field and associated fields class

signalName

Name of the signal

Value

• A list that is easily concatenated into the field list

Details

When constructing signaling fields in this way, each field has the ability to register its own signal and at the same time, there is one top level signal which could be emitted no matter which field changes. Please see the example to learn to register global signal and individual signal.

Examples

Brush.gen <- setRefClass("Brush",
                       fields = signalingFields(list(color = "character",
                          age = "numeric"), signalName = "brushChanged"))
brush <- Brush.gen$new(color = "red", age = 2)
brush$brushChanged$connect(function(x){print(paste(x,
"changed, so emit any-changed signal"))})
brush$colorChanged$connect(function() print("colorChanged signal emited"))
brush$age <- 3
brush$color <- "blue"