When buttons are used to choose exactly one
choice from a set of options, they are usually
called radio buttons.
Here are some examples.
The Xerox Development Environment
provides enumeration items that are used in panels of controls
known as a Form window.
These items allow the user to make a selection
from a set of choices.
There are two forms of enumeration items.
The first form shows only one choice within curly braces.
In order to see all of the choices,
the user must point at the name of the enumeration item
and press both mouse buttons.
The user can then select from the pop up menu.
The second form shows all choices within curly braces
and separated by commas.
To make a selection, the user simply points
at the desired choice and clicks one of the mouse buttons.
The menu method may also be used.
In Star Viewpoint choice parameters,
now commonly called radio buttons,
present multiple choices from which the user selects one.
Visually, a choice parameter is a group
of boxes butted against each other,
each containing a value and an optional label
display to the left of the group.
In this example, the line labeled Deliver
contains one choice parameter.
Any one of the values may be selected
and will be highlighted.
Macintosh radio buttons have two states, on and off.
Radio buttons are grouped into sets
that behave like the station preset buttons on car radios.
Turning one on turns off all the others in the set.
A radio button highlight's when pressed,
unhighlight's when you move outside it,
and only change the state if you release inside it.
Pressing or releasing on a title is
the same as pressing or releasing on the button itself.
Radio buttons are generally used to select one
among a set of options.
Radio buttons are selected by pressing down on the left mouse
button or by using arrow keys to move from one radio button
to the next.
Radio buttons indicate that they have
been selected by being highlighted in the center.
OPEN LOOK provides controls for making choices called Settings.
They come in two varieties, exclusive and nonexclusive.
Like all objects in OPEN LOOK, they
are selected with the Select Mouse Button.
In OPEN LOOK exclusive settings, exactly one item is chosen.
Pressing the Select button down previews the choice.
The choice is made on button up.
In an exclusive setting, note that options touch.
This is a reminder that selecting one
will deselect the other.
The options in nonexclusive settings and OPEN LOOK
do not touch.
This acts as a visual reminder that each item
is selected independently.
Pressing the Select Mouse Button toggles the state
of each choice, previewing on button down
and taking effect on button up.
In all settings, the default choice
is indicated by double border.
As with other OPEN LOOK controls,
moving off the item before releasing the button
cancels the action.
These are radio buttons on the NeXT computer.
Radio buttons allow the user to choose
between a few mutually exclusive choices, one of which
is always selected.
The user clicks on any button to make a choice.
The user may also drag between the buttons,
letting up on the one he wishes to pick.
The radio buttons allow us the opportunity
of selecting which method we want the icons to be sorted by.
As I move the cursor over the buttons,
we see a locate highlight, which tells me
which pictures would be selected if I use the Left Mouse Button.
When I do select the Left Mouse Button,
I get a push and look for that button,
which tracks as I drag the cursor over the other buttons.
When I let go of the Left Mouse Button,
I get a yellow signal lamp, which
shows me which button is selected
and which sort method is in use.
Interaction with Motif toggle buttons
is the same as with push buttons.
When toggles are grouped in a radio box
and represent a one of many selection,
setting any given toggle on turns off
the previously set toggle.
Toggles representing one of many selections
are displayed with a diamond indicator,
while independent toggle buttons use a square.
Radio buttons are commonly used in dialog boxes
to select one out of a choice of many options.
Here, we have a choice of two options for window style,
either paned or outline.
And if you select paned, that radio button will get filled in
and the other option will become not filled in.