GridBagConstraints class specifies constraints
* for components that are laid out using the
* GridBagLayout class.
*
* @version 1.34, 03/15/04
* @author Doug Stein
* @see java.awt.GridBagLayout
* @since JDK1.0
*/
public class GridBagConstraints implements Cloneable, java.io.Serializable {
/**
* 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 java.awt.GridBagConstraints#gridwidth
* @see java.awt.GridBagConstraints#gridheight
* @see java.awt.GridBagConstraints#gridx
* @see java.awt.GridBagConstraints#gridy
*/
public static final int RELATIVE = -1;
/**
* Specifies that this component is the
* last component in its column or row.
*/
public static final int REMAINDER = 0;
/**
* Do not resize the component.
*/
public static final int NONE = 0;
/**
* Resize the component both horizontally and vertically.
*/
public static final int BOTH = 1;
/**
* Resize the component horizontally but not vertically.
*/
public static final int HORIZONTAL = 2;
/**
* Resize the component vertically but not horizontally.
*/
public static final int VERTICAL = 3;
/**
* Put the component in the center of its display area.
*/
public static final int CENTER = 10;
/**
* Put the component at the top of its display area,
* centered horizontally.
*/
public static final int NORTH = 11;
/**
* Put the component at the top-right corner of its display area.
*/
public static final int NORTHEAST = 12;
/**
* Put the component on the right side of its display area,
* centered vertically.
*/
public static final int EAST = 13;
/**
* Put the component at the bottom-right corner of its display area.
*/
public static final int SOUTHEAST = 14;
/**
* Put the component at the bottom of its display area, centered
* horizontally.
*/
public static final int SOUTH = 15;
/**
* Put the component at the bottom-left corner of its display area.
*/
public static final int SOUTHWEST = 16;
/**
* Put the component on the left side of its display area,
* centered vertically.
*/
public static final int WEST = 17;
/**
* Put the component at the top-left corner of its display area.
*/
public static final int NORTHWEST = 18;
/**
* 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.
*/
public static final int PAGE_START = 19;
/**
* 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.
*/
public static final int PAGE_END = 20;
/**
* 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.
*/
public static final int LINE_START = 21;
/**
* 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.
*/
public static final int LINE_END = 22;
/**
* 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.
*/
public static final int FIRST_LINE_START = 23;
/**
* 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.
*/
public static final int FIRST_LINE_END = 24;
/**
* 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.
*/
public static final int LAST_LINE_START = 25;
/**
* 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.
*/
public static final int LAST_LINE_END = 26;
/**
* 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.
* @serial
* @see #clone()
* @see java.awt.GridBagConstraints#gridy
* @see java.awt.ComponentOrientation
*/
public int gridx;
/**
* 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.
* @serial
* @see #clone()
* @see java.awt.GridBagConstraints#gridx
*/
public int gridy;
/**
* Specifies the number of cells in a row for the component's
* display area.
*
* Use REMAINDER to specify that the component's
* display area will be from gridx to the last
* cell in the row.
* Use RELATIVE to specify that the component's
* display area will be from gridx to the next
* to the last one in its row.
*
* gridwidth should be non-negative and the default
* value is 1.
* @serial
* @see #clone()
* @see java.awt.GridBagConstraints#gridheight
*/
public int gridwidth;
/**
* Specifies the number of cells in a column for the component's
* display area.
*
* Use REMAINDER to specify that the component's
* display area will be from gridy to the last
* cell in the column.
* Use RELATIVE to specify that the component's
* display area will be from gridy to the next
* to the last one in its column.
*
* gridheight should be a non-negative value and the
* default value is 1.
* @serial
* @see #clone()
* @see java.awt.GridBagConstraints#gridwidth
*/
public int gridheight;
/**
* 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.
* @serial
* @see #clone()
* @see java.awt.GridBagConstraints#weighty
*/
public double weightx;
/**
* 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.
* @serial
* @see #clone()
* @see java.awt.GridBagConstraints#weightx
*/
public double weighty;
/**
* 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.
* @serial
* @see #clone()
* @see java.awt.ComponentOrientation
*/
public int anchor;
/**
* 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.
* @serial
* @see #clone()
*/
public int fill;
/**
* 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).
* @serial
* @see #clone()
*/
public Insets insets;
/**
* 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 pixels.
*
* The default value is 0.
* @serial
* @see #clone()
* @see java.awt.GridBagConstraints#ipady
*/
public int ipadx;
/**
* 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 pixels.
*
* The default value is 0.
* @serial
* @see #clone()
* @see java.awt.GridBagConstraints#ipadx
*/
public int ipady;
/**
* Temporary place holder for the x coordinate.
* @serial
*/
int tempX;
/**
* Temporary place holder for the y coordinate.
* @serial
*/
int tempY;
/**
* Temporary place holder for the Width of the component.
* @serial
*/
int tempWidth;
/**
* Temporary place holder for the Height of the component.
* @serial
*/
int tempHeight;
/**
* The minimum width of the component. It is used to calculate
* ipady, where the default will be 0.
* @serial
* @see #ipady
*/
int minWidth;
/**
* The minimum height of the component. It is used to calculate
* ipadx, where the default will be 0.
* @serial
* @see #ipadx
*/
int minHeight;
/*
* JDK 1.1 serialVersionUID
*/
private static final long serialVersionUID = -1000070633030801713L;
/**
* Creates a GridBagConstraint object with
* all of its fields set to their default value.
*/
public GridBagConstraints () {
gridx = RELATIVE;
gridy = RELATIVE;
gridwidth = 1;
gridheight = 1;
weightx = 0;
weighty = 0;
anchor = CENTER;
fill = NONE;
insets = new Insets(0, 0, 0, 0);
ipadx = 0;
ipady = 0;
}
/**
* 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.
*
* @param gridx The initial gridx value.
* @param gridy The initial gridy value.
* @param gridwidth The initial gridwidth value.
* @param gridheight The initial gridheight value.
* @param weightx The initial weightx value.
* @param weighty The initial weighty value.
* @param anchor The initial anchor value.
* @param fill The initial fill value.
* @param insets The initial insets value.
* @param ipadx The initial ipadx value.
* @param ipady The initial ipady value.
*
* @see java.awt.GridBagConstraints#gridx
* @see java.awt.GridBagConstraints#gridy
* @see java.awt.GridBagConstraints#gridwidth
* @see java.awt.GridBagConstraints#gridheight
* @see java.awt.GridBagConstraints#weightx
* @see java.awt.GridBagConstraints#weighty
* @see java.awt.GridBagConstraints#anchor
* @see java.awt.GridBagConstraints#fill
* @see java.awt.GridBagConstraints#insets
* @see java.awt.GridBagConstraints#ipadx
* @see java.awt.GridBagConstraints#ipady
*
* @since 1.2
*/
public GridBagConstraints(int gridx, int gridy,
int gridwidth, int gridheight,
double weightx, double weighty,
int anchor, int fill,
Insets insets, int ipadx, int ipady) {
this.gridx = gridx;
this.gridy = gridy;
this.gridwidth = gridwidth;
this.gridheight = gridheight;
this.fill = fill;
this.ipadx = ipadx;
this.ipady = ipady;
this.insets = insets;
this.anchor = anchor;
this.weightx = weightx;
this.weighty = weighty;
}
/**
* Creates a copy of this grid bag constraint.
* @return a copy of this grid bag constraint
*/
public Object clone () {
try {
GridBagConstraints c = (GridBagConstraints)super.clone();
c.insets = (Insets)insets.clone();
return c;
} catch (CloneNotSupportedException e) {
// this shouldn't happen, since we are Cloneable
throw new InternalError();
}
}
}