| CheckboxGroup |
|
typedict |
| |
A
CheckboxGroup
is the interface to Java's AWT CheckboxGroup that is used to impose
radio button behavior (i.e., at most one checkbox can be selected)
on one or more checkboxes.
Yoix programs normally interact with a
CheckboxGroup
by reading or writing the following field:
| model |
An
int
that determines what is returned when the
selected
field is read.
Setting
model
to
0,
which is the default, means your program gets a string that is
a copy of the selected checkbox's
command
field, if it's not
NULL,
or the
text
field if
command
is
NULL.
Setting
model
to
1
means your program gets a checkbox when the
selected
field is read.
| | selected |
A
Checkbox
that represents the checkbox that is selected by the group.
Reading returns a value, either a string or the selected checkbox,
that is determined by the
model
field.
Writing immediately sets the group's selected checkbox to the new value.
Writing a
NULL
value clears all checkboxes.
|
Several permanent fields have not been documented and should not be
used in Yoix applications.
Assigning a
CheckboxGroup
to a checkbox's
group
field automatically adds that checkbox to the group.
| |
| Example: |
The program,
import yoix.*.*;
CheckboxGroup cbg;
Frame f = {
FlowLayout layoutmanager = {
int vgap = 72;
int hgap = 18;
};
Array layout = {
new Checkbox {
CheckboxGroup group = cbg;
String text = "Label 1";
int state = 1;
},
new Checkbox {
CheckboxGroup group = cbg;
String text = "Label 2";
int state = 1;
},
new Checkbox {
CheckboxGroup group = cbg;
String text = "Exit";
int state = 0;
itemStateChanged(e) {
if (e.state) {
printf("You selected: %s\n", cbg.selected);
exit(0);
}
}
},
};
};
f.visible = TRUE;
puts three checkboxes in the same group, adds them to a frame,
and prints,
You selected: Exit
on standard output right before quitting when the last checkbox
is selected.
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| See Also: |
Checkbox
|
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Yoix is a registered trademark of AT&T Inc.
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