| BorderLayout |
|
typedict |
| |
A
BorderLayout
is a layout manager that arranges the components in a container
based on a positioning constraint that follows each component
in the container's
layout
array.
Components should be AWT or Swing components, however all layout managers
build a label appropriate for the container they are working on when they
find a
String
in the layout array where they expected a component.
Properties, like the font or foreground color, used by these short-hand
labels can not be directly specified, so they are inherited from the
container.
Constraints should be one of the integers
NORTH,
SOUTH,
EAST,
WEST,
or
CENTER,
which defined in
yoix.awt
and
yoix.swing,
or case-independent strings that match those names.
The constraint can be omitted, and will be assumed to be
CENTER,
when there is only one component in the
layout
array.
The fields in a
BorderLayout
are:
| hgap |
A
double
that represents the horizontal spacing between components in units
of 72 dots per inch.
| | type |
A read-only
int
that is set to
BORDERLAYOUT,
which is defined in
yoix.awt
and
yoix.swing.
| | vgap |
A
double
that represents the vertical spacing between components in units
of 72 dots per inch.
|
The
Dialog,
Frame,
ScrollPane,
and
Window
containers all use
BorderLayout
as their default layout manager.
| |
| Example: |
The program,
import yoix.*.*;
JButton b1 = {
String text = "Button 1";
Color background = Color.red;
};
JButton b2 = {
String text = "Button 2 - Press to quit";
Color background = Color.blue;
Color foreground = Color.white;
actionPerformed(e) {
exit(0);
}
};
JButton b3 = {
String text = "Button 3";
Color background = Color.green;
};
JFrame f = {
BorderLayout layoutmanager = {
double hgap = 18;
double vgap = 6;
};
Array layout = {
b1, CENTER,
b2, "East",
b3, SOUTH
};
};
f.visible = TRUE;
shows how components, like buttons, are added to a frame that uses a
BorderLayout
as its layout manager.
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| See Also: |
BoxLayout,
CardLayout,
CustomLayout,
FlowLayout,
GridBagLayout,
GridLayout,
LayoutManager
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Yoix is a registered trademark of AT&T Intellectual Property.
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