Class "basicPW", a basic class for primary widgets

Description

This class defines the behavior shared by primary widget object used to build a GUI type interface

Objects from the Class

Objects can be created by calls of the form new("basicPW", ...). Constructors have been defined to create objects of this class for specific widgets such as buttons, list boxes, ..

Slots

wName:

Object of class "character" - a string for the name of the object

wType:

Object of class "character" - a string defining the type of the primary widget. (e.g. button)

wValue:

Object of class "ANY" - the initial value to be associated with the object

wWidth:

Object of class "numeric" - an integer for the width of the object to be rendered (if applicable)

wHeight:

Object of class "numeric" - an integer for the height of the object to be rendered (if applicable)

wFuns:

Object of class "list" - a list of R functions to be executed before the widget is activated

wPreFun:

Object of class "function" - a list of functions to be executed before the value of the widget to be updated

wPostFun:

Object of class "function" - a list of functions to be executed before the value of the widget to be retrieved

wNotify:

Object of class "list" - a list of functions to be executed each time when the value of the widget changes

wEnv:

Object of class "environment" - an R environment object within which the value of the object is stored

wView:

Object of class "widgetView" - a object of the class widgetView to which the widget is rendered

Methods

wEnv<-

signature(object = "basicPW"): Set the value for wEnv slot

wEnv

signature(object = "basicPW"): Get the value for wEnv slot

wFuns<-

signature(object = "basicPW"): Set the value for wFuns slot

wFuns

signature(object = "basicPW"): Get the value for wFuns slot

wHeight<-

signature(object = "basicPW"): Set the value for wHeight slot

wHeight

signature(object = "basicPW"): Get the value for wHeight slot

wName<-

signature(object = "basicPW"): Set the value for wName slot

wName

signature(object = "basicPW"): Get the value for wName slot

wNotify<-

signature(object = "basicPW"): Set the value for wNotify slot

wNotify

signature(object = "basicPW"): Get the value for wNotify slot

wPostFun<-

signature(object = "basicPW"): Set the value for wPostFun slot

wPostFun

signature(object = "basicPW"): Get the value for wPostFun slot

wPreFun<-

signature(object = "basicPW"): Set the value for wPreFun slot

wPreFun

signature(object = "basicPW"): Get the value for wPreFun slot

wType<-

signature(object = "basicPW"): Set the value for wType slot

wType

signature(object = "basicPW"): Get the value for wType slot

wValue<-

signature(object = "basicPW"): Set the value for wValue slot

wValue

signature(object = "basicPW"): Get the value for wValue slot

wView<-

signature(object = "basicPW"): Set the value for wView slot

view

signature(object = "basicPW"): Get the value for wView slot

wWidth<-

signature(object = "basicPW"): Set the value for wWidth slot

wWidth

signature(object = "basicPW"): Get the value for wWidth slot

Author(s)

Jianhua Zhang

References

Programming with data

See Also

widgetView-class,widget-class

Examples

# Create an R environment to store the values of primary widgets
PWEnv <- new.env(hash = TRUE, parent = parent.frame(1))

# Create a label
label1 <- label(wName = "label1", wValue = "File Name: ", wEnv = PWEnv)

# Create an entry box with "Feed me using brows" as the default value
entry1 <- entryBox(wName = "entry1", wValue = "Feed me using browse",
                   wEnv = PWEnv)