Box
Java SE 6
| public class javax.swing Box
|
Java SE 6 |
The Box class can create several kinds
of invisible components
that affect layout:
glue, struts, and rigid areas.
If all the components your Box contains
have a fixed size,
you might want to use a glue component
(returned by createGlue)
to control the components' positions.
If you need a fixed amount of space between two components,
try using a strut
(createHorizontalStrut or createVerticalStrut).
If you need an invisible component
that always takes up the same amount of space,
get it by invoking createRigidArea.
If you are implementing a BoxLayout you
can find further information and examples in
How to Use BoxLayout,
a section in The Java Tutorial.
Warning:
Serialized objects of this class will not be compatible with
future Swing releases. The current serialization support is
appropriate for short term storage or RMI between applications running
the same version of Swing. As of 1.4, support for long term storage
of all JavaBeansTM
has been added to the java.beans package.
Please see java.beans.XMLEncoder.
| version | 1.45 11/17/05 |
| See also | javax.swing.BoxLayout |
| Constructors | |||||||
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| public | Box(int axis) Creates a Box that displays its components
along the the specified axis.
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| Methods | |||||||
|---|---|---|---|---|---|---|---|
| public static Component | createGlue() Creates an invisible "glue" component that can be useful in a Box whose visible components have a maximum width (for a horizontal box) or height (for a vertical box). You can think of the glue component as being a gooey substance that expands as much as necessary to fill the space between its neighboring components. For example, suppose you have a horizontal box that contains two fixed-size components. If the box gets extra space, the fixed-size components won't become larger, so where does the extra space go? Without glue, the extra space goes to the right of the second component. If you put glue between the fixed-size components, then the extra space goes there. If you put glue before the first fixed-size component, the extra space goes there, and the fixed-size components are shoved against the right edge of the box. If you put glue before the first fixed-size component and after the second fixed-size component, the fixed-size components are centered in the box.
To use glue,
call
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| public static Box | createHorizontalBox() Creates a Box that displays its components
from left to right. If you want a Box that
respects the component orientation you should create the
Box using the constructor and pass in
BoxLayout.LINE_AXIS, eg:
Box lineBox = new Box(BoxLayout.LINE_AXIS);
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| public static Component | createHorizontalGlue() Creates a horizontal glue component.
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| public static Component | createHorizontalStrut(int width) Creates an invisible, fixed-width component. In a horizontal box, you typically use this method to force a certain amount of space between two components. In a vertical box, you might use this method to force the box to be at least the specified width. The invisible component has no height unless excess space is available, in which case it takes its share of available space, just like any other component that has no maximum height.
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| public static Component | createRigidArea(Dimension d) Creates an invisible component that's always the specified size.
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| public static Box | createVerticalBox() Creates a Box that displays its components
from top to bottom. If you want a Box that
respects the component orientation you should create the
Box using the constructor and pass in
BoxLayout.PAGE_AXIS, eg:
Box lineBox = new Box(BoxLayout.PAGE_AXIS);
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| public static Component | createVerticalGlue() Creates a vertical glue component.
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| public static Component | createVerticalStrut(int height) Creates an invisible, fixed-height component. In a vertical box, you typically use this method to force a certain amount of space between two components. In a horizontal box, you might use this method to force the box to be at least the specified height. The invisible component has no width unless excess space is available, in which case it takes its share of available space, just like any other component that has no maximum width.
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| protected void | paintComponent(Graphics g) Paints this Box. If this Box has a UI this
method invokes super's implementation, otherwise if this
Box is opaque the Graphics is filled
using the background.
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| Properties | |||
|---|---|---|---|
| public AccessibleContext | getAccessibleContext() Gets the AccessibleContext associated with this Box. For boxes, the AccessibleContext takes the form of an AccessibleBox. A new AccessibleAWTBox instance is created if necessary.
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| public void | setLayout(LayoutManager l) Throws an AWTError, since a Box can use only a BoxLayout.
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