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CHAPTER 4: User-Interface Tools Control objects 131

radiobutton RadioButton

A dual-state control, grouped with other radiobuttons, of which only

one can be in the selected state. Shows the selected state when

value is true, empty when value is false. Calls the onClick callback if

the control is clicked or if its notify()

method is called.

All

radiobuttons in a group must be created sequentially, with no

intervening creation of other element types. Only one

radiobutton

in a group can be set at a time; setting a different

radiobutton

unsets the original one.

To add to a window

w.add (“radiobutton” [, bounds, text,

{creation_properties}]);

bounds

: Optional. The control’s position and size.

text: Optional. The text displayed in the control.

creation_properties: Optional. An object that contains the

following property:

name: A unique name for the control.

scrollbar Scrollbar

A scrollbar with a draggable scroll indicator and stepper buttons to

move the indicator. The

scrollbar control has a horizontal

orientation if the

width is greater than the height at creation time,

or vertical if its

height is greater than its width.

Calls the onChange

callback after the position of the indicator is

changed or if its notify()

method is called. Calls the onChanging

callback repeatedly while the user is moving the indicator.

X The value property contains the current position of the

scrollbar’s indicator within the scrolling area, within the range of

minvalue and maxvalue.

X The stepdelta property determines the scrolling unit for the up

or down arrow; default is 1.

X The jumpdelta property determines the scrolling unit for a

jump (as when the bar is clicked outside the indicator or arrows);

default is 20% of the range between

minvalue and maxvalue.

Type keyword Class name Description

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