mirror of git://gcc.gnu.org/git/gcc.git
133 lines
4.3 KiB
Java
133 lines
4.3 KiB
Java
/* BasicPanelUI.java
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Copyright (C) 2002, 2004, 2006, Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package javax.swing.plaf.basic;
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import javax.swing.JComponent;
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import javax.swing.JPanel;
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import javax.swing.LookAndFeel;
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import javax.swing.plaf.ComponentUI;
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import javax.swing.plaf.PanelUI;
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/**
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* A UI delegate for the {@link JPanel} component.
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*/
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public class BasicPanelUI extends PanelUI
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{
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/**
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* A UI delegate that can be shared by all panels (because the delegate is
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* stateless).
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*/
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static BasicPanelUI sharedUI;
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/**
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* Returns a UI delegate for the specified component.
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*
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* @param panel the panel.
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*/
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public static ComponentUI createUI(JComponent panel)
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{
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if (sharedUI == null)
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sharedUI = new BasicPanelUI();
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return sharedUI;
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}
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/**
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* Installs this UI delegate in the specified component.
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*
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* @param c the component (should be a {@link JPanel}, <code>null</code> not
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* permitted).
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*/
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public void installUI(JComponent c)
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{
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super.installUI(c);
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if (c instanceof JPanel)
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{
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JPanel p = (JPanel) c;
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installDefaults(p);
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}
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}
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/**
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* Installs the defaults for this UI delegate in the specified panel.
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*
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* @param p the panel (<code>null</code> not permitted).
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*/
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protected void installDefaults(JPanel p)
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{
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LookAndFeel.installColorsAndFont(p, "Panel.background", "Panel.foreground",
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"Panel.font");
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// A test against the reference implementation shows that this method will
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// install a border if one is defined in the UIDefaults table (even though
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// the BasicLookAndFeel doesn't actually define a "Panel.border"). This
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// test was written after discovering that a null argument to
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// uninstallDefaults throws a NullPointerException in
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// LookAndFeel.uninstallBorder()...
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LookAndFeel.installBorder(p, "Panel.border");
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}
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/**
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* Uninstalls this UI delegate from the specified component.
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*
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* @param c the component (<code>null</code> not permitted).
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*/
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public void uninstallUI(JComponent c)
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{
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uninstallDefaults((JPanel) c);
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}
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/**
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* Uninstalls the UI defaults for the specified panel.
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*
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* @param p the panel (<code>null</code> not permitted).
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*/
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protected void uninstallDefaults(JPanel p)
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{
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// Tests on the reference implementation showed this method:
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// (1) doesn't actually remove the installed colors and font installed
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// by installDefaults(), it isn't necessary;
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// (2) throws a NullPointerException in LookAndFeel.uninstallBorder() if
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// p is null. Strangely, no border is installed by the
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// BasicLookAndFeel - perhaps this is needed by another LAF?
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LookAndFeel.uninstallBorder(p);
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}
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}
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