javax.swing.plaf.basic

Class BasicBorders.MarginBorder

Enclosing Class:
BasicBorders
Implemented Interfaces:
Border, Serializable, UIResource

public static class BasicBorders.MarginBorder
extends AbstractBorder
implements Serializable, UIResource

An invisible, but spacing border whose margin is determined by calling the getMargin() method of the enclosed component. If the enclosed component has no such method, this border will not occupy any space.

[An illustration that shows how MarginBorder
 determines its borders]

See Also:
Serialized Form

Constructor Summary

MarginBorder()
Constructs a new MarginBorder.

Method Summary

Insets
getBorderInsets(Component c)
Measures the width of this border.
Insets
getBorderInsets(Component c, Insets insets)
Determines the insets of this border by calling the getMargin() method of the enclosed component.

Methods inherited from class javax.swing.border.AbstractBorder

getBorderInsets, getBorderInsets, getInteriorRectangle, getInteriorRectangle, isBorderOpaque, paintBorder

Methods inherited from class java.lang.Object

clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

MarginBorder

public MarginBorder()
Constructs a new MarginBorder.

Method Details

getBorderInsets

public Insets getBorderInsets(Component c)
Measures the width of this border.
Specified by:
getBorderInsets in interface Border
Overrides:
getBorderInsets in interface AbstractBorder
Parameters:
c - the component whose border is to be measured.
Returns:
an Insets object whose left, right, top and bottom fields indicate the width of the border at the respective edge.

getBorderInsets

public Insets getBorderInsets(Component c,
                              Insets insets)
Determines the insets of this border by calling the getMargin() method of the enclosed component. The resulting margin will be stored into the the left, right, top and bottom fields of the passed insets parameter.

Unfortunately, getMargin() is not a method of JComponent or some other common superclass of things with margins. While reflection could be used to determine the existence of this method, this would be slow on many virtual machines. Therefore, the current implementation knows about AbstractButton.getMargin(), JPopupMenu.getMargin(), JToolBar.getMargin(), and JTextComponent. If c is an instance of a known class, the respective getMargin() method is called to determine the correct margin. Otherwise, a zero-width margin is returned.

Overrides:
getBorderInsets in interface AbstractBorder
Parameters:
c - the component whose border is to be measured.
Returns:
the same object that was passed for insets, but with changed fields.

BasicBorders.java -- Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc. This file is part of GNU Classpath. GNU Classpath is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. GNU Classpath is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GNU Classpath; see the file COPYING. If not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. Linking this library statically or dynamically with other modules is making a combined work based on this library. Thus, the terms and conditions of the GNU General Public License cover the whole combination. As a special exception, the copyright holders of this library give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you may extend this exception to your version of the library, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version.