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Class AbstractBorder

java.lang.Object

javax.swing.border.AbstractBorder

All Implemented Interfaces:: Serializable, Border

public abstract class AbstractBorder extends Object implements Border, Serializable

A class that implements an empty border with no size. This provides a convenient base class from which other border classes can be easily derived.

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 JavaBeans has been added to the java.beans package. Please see XMLEncoder.

Constructor Summary

AbstractBorder()

Modifier	Constructor	Description
`protected`	Constructor for subclasses to call.

Method Summary

Modifier and Type	Method	Description
`int`	`getBaseline(Component c, int width, int height)`	Returns the baseline.
`Component.BaselineResizeBehavior`	`getBaselineResizeBehavior(Component c)`	Returns an enum indicating how the baseline of a component changes as the size changes.
`Insets`	`getBorderInsets(Component c)`	This default implementation returns a new `Insets` object that is initialized by the `getBorderInsets(Component,Insets)` method.
`Insets`	`getBorderInsets(Component c, Insets insets)`	Reinitializes the insets parameter with this Border's current Insets.
`Rectangle`	`getInteriorRectangle(Component c, int x, int y, int width, int height)`	This convenience method calls the static method.
`static Rectangle`	`getInteriorRectangle(Component c, Border b, int x, int y, int width, int height)`	Returns a rectangle using the arguments minus the insets of the border.
`boolean`	`isBorderOpaque()`	This default implementation returns false.
`void`	`paintBorder(Component c, Graphics g, int x, int y, int width, int height)`	This default implementation does no painting.

Methods declared in class java.lang.Object

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

Constructor Details

AbstractBorder

protected AbstractBorder()

Constructor for subclasses to call.

Method Details

paintBorder

public void paintBorder(Component c, Graphics g, int x, int y, int width, int height)

This default implementation does no painting.

Specified by:: paintBorder in interface Border
Parameters:: c - the component for which this border is being painted; g - the paint graphics; x - the x position of the painted border; y - the y position of the painted border; width - the width of the painted border; height - the height of the painted border

getBorderInsets

public Insets getBorderInsets(Component c)

This default implementation returns a new Insets object that is initialized by the getBorderInsets(Component,Insets) method. By default the top, left, bottom, and right fields are set to 0.

Specified by:: getBorderInsets in interface Border
Parameters:: c - the component for which this border insets value applies
Returns:: a new Insets object

getBorderInsets

public Insets getBorderInsets(Component c, Insets insets)

Reinitializes the insets parameter with this Border's current Insets.

Parameters:: c - the component for which this border insets value applies; insets - the object to be reinitialized
Returns:: the insets object
Throws:: NullPointerException - if the specified insets is null

isBorderOpaque

public boolean isBorderOpaque()

This default implementation returns false.

Specified by:: isBorderOpaque in interface Border
Returns:: false

getInteriorRectangle

public Rectangle getInteriorRectangle(Component c, int x, int y, int width, int height)

This convenience method calls the static method.

Parameters:: c - the component for which this border is being computed; x - the x position of the border; y - the y position of the border; width - the width of the border; height - the height of the border
Returns:: a Rectangle containing the interior coordinates

getInteriorRectangle

public static Rectangle getInteriorRectangle(Component c, Border b, int x, int y, int width, int height)

Returns a rectangle using the arguments minus the insets of the border. This is useful for determining the area that components should draw in that will not intersect the border.

Parameters:: c - the component for which this border is being computed; b - the Border object; x - the x position of the border; y - the y position of the border; width - the width of the border; height - the height of the border
Returns:: a Rectangle containing the interior coordinates

getBaseline

public int getBaseline(Component c, int width, int height)

Returns the baseline. A return value less than 0 indicates the border does not have a reasonable baseline.

The default implementation returns -1. Subclasses that support baseline should override appropriately. If a value >= 0 is returned, then the component has a valid baseline for any size >= the minimum size and getBaselineResizeBehavior can be used to determine how the baseline changes with size.

Parameters:

c - Component baseline is being requested for

width - the width to get the baseline for

height - the height to get the baseline for

Returns:

the baseline or < 0 indicating there is no reasonable baseline

Throws:

IllegalArgumentException - if width or height is < 0

Since:

1.6

See Also:

getBaselineResizeBehavior

public Component.BaselineResizeBehavior getBaselineResizeBehavior(Component c)

Returns an enum indicating how the baseline of a component changes as the size changes. This method is primarily meant for layout managers and GUI builders.

The default implementation returns BaselineResizeBehavior.OTHER, subclasses that support baseline should override appropriately. Subclasses should never return null; if the baseline can not be calculated return BaselineResizeBehavior.OTHER. Callers should first ask for the baseline using getBaseline and if a value >= 0 is returned use this method. It is acceptable for this method to return a value other than BaselineResizeBehavior.OTHER even if getBaseline returns a value less than 0.

Parameters:

c - Component to return baseline resize behavior for

Returns:

an enum indicating how the baseline changes as the border is resized

Throws:

NullPointerException - if Component is null

Since:

1.6

See Also:

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https://docs.oracle.com/en/java/javase/21/docs/api/java.desktop/javax/swing/border/AbstractBorder.html