java.awt
Class GridBagConstraints

java.lang.Object
  java.awt.GridBagConstraints

All Implemented Interfaces:

Cloneable, Serializable

public class GridBagConstraints

extends Object

implements Cloneable, Serializable

The GridBagConstraints class specifies constraints for components that are laid out using the GridBagLayout class.

Since:

JDK1.0

Author:

Doug Stein

See Also:

GridBagLayout, Serialized Form

Field Summary

int	anchor This field is used when the component is smaller than its display area.
static int	BOTH Resize the component both horizontally and vertically.
static int	CENTER Put the component in the center of its display area.
static int	EAST Put the component on the right side of its display area, centered vertically.
int	fill This field is used when the component's display area is larger than the component's requested size.
static int	FIRST_LINE_END Place the component in the corner of its display area where the first line of text on a page would normally end for the current ComponentOrienation.
static int	FIRST_LINE_START Place the component in the corner of its display area where the first line of text on a page would normally begin for the current ComponentOrienation.
int	gridheight Specifies the number of cells in a column for the component's display area.
int	gridwidth Specifies the number of cells in a row for the component's display area.
int	gridx Specifies the cell containing the leading edge of the component's display area, where the first cell in a row has gridx=0.
int	gridy Specifies the cell at the top of the component's display area, where the topmost cell has gridy=0.
static int	HORIZONTAL Resize the component horizontally but not vertically.
Insets	insets This field specifies the external padding of the component, the minimum amount of space between the component and the edges of its display area.
int	ipadx This field specifies the internal padding of the component, how much space to add to the minimum width of the component.
int	ipady This field specifies the internal padding, that is, how much space to add to the minimum height of the component.
static int	LAST_LINE_END Place the component in the corner of its display area where the last line of text on a page would normally end for the current ComponentOrienation.
static int	LAST_LINE_START Place the component in the corner of its display area where the last line of text on a page would normally start for the current ComponentOrienation.
static int	LINE_END Place the component centered along the edge of its display area where lines of text would normally end for the current ComponentOrienation.
static int	LINE_START Place the component centered along the edge of its display area where lines of text would normally begin for the current ComponentOrienation.
(package private) int	minHeight The minimum height of the component.
(package private) int	minWidth The minimum width of the component.
static int	NONE Do not resize the component.
static int	NORTH Put the component at the top of its display area, centered horizontally.
static int	NORTHEAST Put the component at the top-right corner of its display area.
static int	NORTHWEST Put the component at the top-left corner of its display area.
static int	PAGE_END Place the component centered along the edge of its display area associated with the end of a page for the current ComponentOrienation.
static int	PAGE_START Place the component centered along the edge of its display area associated with the start of a page for the current ComponentOrienation.
static int	RELATIVE Specifies that this component is the next-to-last component in its column or row (gridwidth, gridheight), or that this component be placed next to the previously added component (gridx, gridy).
static int	REMAINDER Specifies that this component is the last component in its column or row.
private static long	serialVersionUID
static int	SOUTH Put the component at the bottom of its display area, centered horizontally.
static int	SOUTHEAST Put the component at the bottom-right corner of its display area.
static int	SOUTHWEST Put the component at the bottom-left corner of its display area.
(package private) int	tempHeight Temporary place holder for the Height of the component.
(package private) int	tempWidth Temporary place holder for the Width of the component.
(package private) int	tempX Temporary place holder for the x coordinate.
(package private) int	tempY Temporary place holder for the y coordinate.
static int	VERTICAL Resize the component vertically but not horizontally.
double	weightx Specifies how to distribute extra horizontal space.
double	weighty Specifies how to distribute extra vertical space.
static int	WEST Put the component on the left side of its display area, centered vertically.

Constructor Summary

GridBagConstraints()
Creates a GridBagConstraint object with all of its fields set to their default value.

GridBagConstraints(int gridx, int gridy, int gridwidth, int gridheight, double weightx, double weighty, int anchor, int fill, Insets insets, int ipadx, int ipady)
Creates a GridBagConstraints object with all of its fields set to the passed-in arguments.

Method Summary

Object

clone() Creates a copy of this grid bag constraint.

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

RELATIVE

public static final int RELATIVE

Specifies that this component is the next-to-last component in its column or row (gridwidth, gridheight), or that this component be placed next to the previously added component (gridx, gridy).

See Also:

gridwidth, gridheight, gridx, gridy, Constant Field Values

REMAINDER

public static final int REMAINDER

Specifies that this component is the last component in its column or row.

See Also:

Constant Field Values

NONE

public static final int NONE

Do not resize the component.

See Also:

Constant Field Values

BOTH

public static final int BOTH

Resize the component both horizontally and vertically.

See Also:

Constant Field Values

HORIZONTAL

public static final int HORIZONTAL

Resize the component horizontally but not vertically.

See Also:

Constant Field Values

VERTICAL

public static final int VERTICAL

Resize the component vertically but not horizontally.

See Also:

Constant Field Values

CENTER

public static final int CENTER

Put the component in the center of its display area.

See Also:

Constant Field Values

NORTH

public static final int NORTH

Put the component at the top of its display area, centered horizontally.

See Also:

Constant Field Values

NORTHEAST

public static final int NORTHEAST

Put the component at the top-right corner of its display area.

See Also:

Constant Field Values

EAST

public static final int EAST

Put the component on the right side of its display area, centered vertically.

See Also:

Constant Field Values

SOUTHEAST

public static final int SOUTHEAST

Put the component at the bottom-right corner of its display area.

See Also:

Constant Field Values

SOUTH

public static final int SOUTH

Put the component at the bottom of its display area, centered horizontally.

See Also:

Constant Field Values

SOUTHWEST

public static final int SOUTHWEST

Put the component at the bottom-left corner of its display area.

See Also:

Constant Field Values

WEST

public static final int WEST

Put the component on the left side of its display area, centered vertically.

See Also:

Constant Field Values

NORTHWEST

public static final int NORTHWEST

Put the component at the top-left corner of its display area.

See Also:

Constant Field Values

PAGE_START

public static final int PAGE_START

Place the component centered along the edge of its display area associated with the start of a page for the current ComponentOrienation. Equal to NORTH for horizontal orientations.

See Also:

Constant Field Values

PAGE_END

public static final int PAGE_END

Place the component centered along the edge of its display area associated with the end of a page for the current ComponentOrienation. Equal to SOUTH for horizontal orientations.

See Also:

Constant Field Values

LINE_START

public static final int LINE_START

Place the component centered along the edge of its display area where lines of text would normally begin for the current ComponentOrienation. Equal to WEST for horizontal, left-to-right orientations and EAST for horizontal, right-to-left orientations.

See Also:

Constant Field Values

LINE_END

public static final int LINE_END

Place the component centered along the edge of its display area where lines of text would normally end for the current ComponentOrienation. Equal to EAST for horizontal, left-to-right orientations and WEST for horizontal, right-to-left orientations.

See Also:

Constant Field Values

FIRST_LINE_START

public static final int FIRST_LINE_START

Place the component in the corner of its display area where the first line of text on a page would normally begin for the current ComponentOrienation. Equal to NORTHWEST for horizontal, left-to-right orientations and NORTHEAST for horizontal, right-to-left orientations.

See Also:

Constant Field Values

FIRST_LINE_END

public static final int FIRST_LINE_END

Place the component in the corner of its display area where the first line of text on a page would normally end for the current ComponentOrienation. Equal to NORTHEAST for horizontal, left-to-right orientations and NORTHWEST for horizontal, right-to-left orientations.

See Also:

Constant Field Values

LAST_LINE_START

public static final int LAST_LINE_START

Place the component in the corner of its display area where the last line of text on a page would normally start for the current ComponentOrienation. Equal to SOUTHWEST for horizontal, left-to-right orientations and SOUTHEAST for horizontal, right-to-left orientations.

See Also:

Constant Field Values

LAST_LINE_END

public static final int LAST_LINE_END

Place the component in the corner of its display area where the last line of text on a page would normally end for the current ComponentOrienation. Equal to SOUTHEAST for horizontal, left-to-right orientations and SOUTHWEST for horizontal, right-to-left orientations.

See Also:

Constant Field Values

gridx

public int gridx

Specifies the cell containing the leading edge of the component's display area, where the first cell in a row has gridx=0. The leading edge of a component's display area is its left edge for a horizontal, left-to-right container and its right edge for a horizontal, right-to-left container. The value RELATIVE specifies that the component be placed immediately following the component that was added to the container just before this component was added.

The default value is RELATIVE. gridx should be a non-negative value.

See Also:

clone(), gridy, ComponentOrientation

gridy

public int gridy

Specifies the cell at the top of the component's display area, where the topmost cell has gridy=0. The value RELATIVE specifies that the component be placed just below the component that was added to the container just before this component was added.

The default value is RELATIVE. gridy should be a non-negative value.

See Also:

clone(), gridx

gridwidth

public int gridwidth

Specifies the number of cells in a row for the component's display area.

Use REMAINDER to specify that the component be the last one in its row. Use RELATIVE to specify that the component be the next-to-last one in its row.

gridwidth should be non-negative and the default value is 1.

See Also:

clone(), gridheight

gridheight

public int gridheight

Specifies the number of cells in a column for the component's display area.

Use REMAINDER to specify that the component be the last one in its column. Use RELATIVE to specify that the component be the next-to-last one in its column.

gridheight should be a non-negative value and the default value is 1.

See Also:

clone(), gridwidth

weightx

public double weightx

Specifies how to distribute extra horizontal space.

The grid bag layout manager calculates the weight of a column to be the maximum weightx of all the components in a column. If the resulting layout is smaller horizontally than the area it needs to fill, the extra space is distributed to each column in proportion to its weight. A column that has a weight of zero receives no extra space.

If all the weights are zero, all the extra space appears between the grids of the cell and the left and right edges.

The default value of this field is 0. weightx should be a non-negative value.

See Also:

clone(), weighty

weighty

public double weighty

Specifies how to distribute extra vertical space.

The grid bag layout manager calculates the weight of a row to be the maximum weighty of all the components in a row. If the resulting layout is smaller vertically than the area it needs to fill, the extra space is distributed to each row in proportion to its weight. A row that has a weight of zero receives no extra space.

If all the weights are zero, all the extra space appears between the grids of the cell and the top and bottom edges.

The default value of this field is 0. weighty should be a non-negative value.

See Also:

clone(), weightx

anchor

public int anchor

This field is used when the component is smaller than its display area. It determines where, within the display area, to place the component.

There are two kinds of possible values: relative and absolute. Relative values are interpreted relative to the container's component orientation property while absolute values are not. The absolute values are: CENTER, NORTH, NORTHEAST, EAST, SOUTHEAST, SOUTH, SOUTHWEST, WEST, and NORTHWEST. The relative values are: PAGE_START, PAGE_END, LINE_START, LINE_END, FIRST_LINE_START, FIRST_LINE_END, LAST_LINE_START and LAST_LINE_END. The default value is CENTER.

See Also:

clone(), ComponentOrientation

fill

public int fill

This field is used when the component's display area is larger than the component's requested size. It determines whether to resize the component, and if so, how.

The following values are valid for fill:

• NONE: Do not resize the component.
• HORIZONTAL: Make the component wide enough to fill its display area horizontally, but do not change its height.
• VERTICAL: Make the component tall enough to fill its display area vertically, but do not change its width.
• BOTH: Make the component fill its display area entirely.

The default value is NONE.

See Also:

clone()

insets

public Insets insets

This field specifies the external padding of the component, the minimum amount of space between the component and the edges of its display area.

The default value is new Insets(0, 0, 0, 0).

See Also:

clone()

ipadx

public int ipadx

This field specifies the internal padding of the component, how much space to add to the minimum width of the component. The width of the component is at least its minimum width plus (ipadx * 2) pixels.

The default value is 0.

See Also:

clone(), ipady

ipady

public int ipady

This field specifies the internal padding, that is, how much space to add to the minimum height of the component. The height of the component is at least its minimum height plus (ipady * 2) pixels.

The default value is 0.

See Also:

clone(), ipadx

tempX

int tempX

Temporary place holder for the x coordinate.

tempY

int tempY

Temporary place holder for the y coordinate.

tempWidth

int tempWidth

Temporary place holder for the Width of the component.

tempHeight

int tempHeight

Temporary place holder for the Height of the component.

minWidth

int minWidth

The minimum width of the component. It is used to calculate ipady, where the default will be 0.

See Also:

ipady

minHeight

int minHeight

The minimum height of the component. It is used to calculate ipadx, where the default will be 0.

See Also:

ipadx

serialVersionUID

private static final long serialVersionUID

See Also:

Constant Field Values

Constructor Detail

GridBagConstraints

public GridBagConstraints()

Creates a GridBagConstraint object with all of its fields set to their default value.

GridBagConstraints

public GridBagConstraints(int gridx,
                          int gridy,
                          int gridwidth,
                          int gridheight,
                          double weightx,
                          double weighty,
                          int anchor,
                          int fill,
                          Insets insets,
                          int ipadx,
                          int ipady)

Creates a GridBagConstraints object with all of its fields set to the passed-in arguments. Note: Because the use of this constructor hinders readability of source code, this constructor should only be used by automatic source code generation tools.

Parameters:

gridx - The initial gridx value.

gridy - The initial gridy value.

gridwidth - The initial gridwidth value.

gridheight - The initial gridheight value.

weightx - The initial weightx value.

weighty - The initial weighty value.

anchor - The initial anchor value.

fill - The initial fill value.

insets - The initial insets value.

ipadx - The initial ipadx value.

ipady - The initial ipady value.

Since:

1.2

See Also:

gridx, gridy, gridwidth, gridheight, weightx, weighty, anchor, fill, insets, ipadx, ipady

Method Detail

clone

public Object clone()

Creates a copy of this grid bag constraint.

Overrides:

clone in class Object

Returns:

a copy of this grid bag constraint

See Also:

Cloneable