728 lines
30 KiB
Java
728 lines
30 KiB
Java
/*
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* Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package javax.swing;
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import java.awt.Font;
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import java.awt.event.InputEvent;
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import java.awt.event.KeyEvent;
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import java.awt.Color;
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import java.awt.Component;
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import java.awt.SystemColor;
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import java.awt.Toolkit;
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import javax.swing.text.*;
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import javax.swing.border.*;
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import javax.swing.plaf.*;
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import java.net.URL;
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import sun.swing.SwingUtilities2;
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import sun.swing.DefaultLayoutStyle;
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import sun.swing.ImageIconUIResource;
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import java.util.StringTokenizer;
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/**
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* {@code LookAndFeel}, as the name implies, encapsulates a look and
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* feel. Beyond installing a look and feel most developers never need to
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* interact directly with {@code LookAndFeel}. In general only developers
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* creating a custom look and feel need to concern themselves with this class.
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* <p>
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* Swing is built upon the foundation that each {@code JComponent}
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* subclass has an implementation of a specific {@code ComponentUI}
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* subclass. The {@code ComponentUI} is often referred to as "the ui",
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* "component ui", or "look and feel delegate". The {@code ComponentUI}
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* subclass is responsible for providing the look and feel specific
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* functionality of the component. For example, {@code JTree} requires
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* an implementation of the {@code ComponentUI} subclass {@code
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* TreeUI}. The implementation of the specific {@code
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* ComponentUI} subclass is provided by the {@code LookAndFeel}. Each
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* {@code JComponent} subclass identifies the {@code ComponentUI}
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* subclass it requires by way of the {@code JComponent} method {@code
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* getUIClassID}.
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* <p>
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* Each {@code LookAndFeel} implementation must provide
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* an implementation of the appropriate {@code ComponentUI} subclass by
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* specifying a value for each of Swing's ui class ids in the {@code
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* UIDefaults} object returned from {@code getDefaults}. For example,
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* {@code BasicLookAndFeel} uses {@code BasicTreeUI} as the concrete
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* implementation for {@code TreeUI}. This is accomplished by {@code
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* BasicLookAndFeel} providing the key-value pair {@code
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* "TreeUI"-"javax.swing.plaf.basic.BasicTreeUI"}, in the
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* {@code UIDefaults} returned from {@code getDefaults}. Refer to
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* {@link UIDefaults#getUI(JComponent)} for defails on how the implementation
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* of the {@code ComponentUI} subclass is obtained.
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* <p>
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* When a {@code LookAndFeel} is installed the {@code UIManager} does
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* not check that an entry exists for all ui class ids. As such,
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* random exceptions will occur if the current look and feel has not
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* provided a value for a particular ui class id and an instance of
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* the {@code JComponent} subclass is created.
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*
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* <h2>Recommendations for Look and Feels</h2>
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*
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* As noted in {@code UIManager} each {@code LookAndFeel} has the opportunity
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* to provide a set of defaults that are layered in with developer and
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* system defaults. Some of Swing's components require the look and feel
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* to provide a specific set of defaults. These are documented in the
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* classes that require the specific default.
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*
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* <h3><a name="#defaultRecommendation">ComponentUIs and defaults</a></h2>
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*
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* All {@code ComponentUIs} typically need to set various properties
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* on the {@code JComponent} the {@code ComponentUI} is providing the
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* look and feel for. This is typically done when the {@code
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* ComponentUI} is installed on the {@code JComponent}. Setting a
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* property should only be done if the developer has not set the
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* property. For non-primitive values it is recommended that the
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* {@code ComponentUI} only change the property on the {@code
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* JComponent} if the current value is {@code null} or implements
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* {@code UIResource}. If the current value is {@code null} or
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* implements {@code UIResource} it indicates the property has not
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* been set by the developer, and the ui is free to change it. For
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* example, {@code BasicButtonUI.installDefaults} only changes the
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* font on the {@code JButton} if the return value from {@code
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* button.getFont()} is {@code null} or implements {@code
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* UIResource}. On the other hand if {@code button.getFont()} returned
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* a {@code non-null} value that did not implement {@code UIResource}
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* then {@code BasicButtonUI.installDefaults} would not change the
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* {@code JButton}'s font.
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* <p>
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* For primitive values, such as {@code opaque}, the method {@code
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* installProperty} should be invoked. {@code installProperty} only changes
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* the correspoding property if the value has not been changed by the
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* developer.
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* <p>
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* {@code ComponentUI} implementations should use the various install methods
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* provided by this class as they handle the necessary checking and install
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* the property using the recommended guidelines.
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* <p>
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* <h3><a name="exceptions"></a>Exceptions</h3>
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*
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* All of the install methods provided by {@code LookAndFeel} need to
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* access the defaults if the value of the property being changed is
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* {@code null} or a {@code UIResource}. For example, installing the
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* font does the following:
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* <pre>
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* JComponent c;
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* Font font = c.getFont();
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* if (font == null || (font instanceof UIResource)) {
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* c.setFont(UIManager.getFont("fontKey"));
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* }
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* </pre>
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* If the font is {@code null} or a {@code UIResource}, the
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* defaults table is queried with the key {@code fontKey}. All of
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* {@code UIDefault's} get methods throw a {@code
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* NullPointerException} if passed in {@code null}. As such, unless
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* otherwise noted each of the various install methods of {@code
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* LookAndFeel} throw a {@code NullPointerException} if the current
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* value is {@code null} or a {@code UIResource} and the supplied
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* defaults key is {@code null}. In addition, unless otherwise specified
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* all of the {@code install} methods throw a {@code NullPointerException} if
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* a {@code null} component is passed in.
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*
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* @author Tom Ball
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* @author Hans Muller
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*/
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public abstract class LookAndFeel
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{
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/**
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* Convenience method for setting a component's foreground
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* and background color properties with values from the
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* defaults. The properties are only set if the current
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* value is either {@code null} or a {@code UIResource}.
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*
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* @param c component to set the colors on
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* @param defaultBgName key for the background
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* @param defaultFgName key for the foreground
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*
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* @see #installColorsAndFont
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* @see UIManager#getColor
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* @throws NullPointerException as described in
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* <a href="#exceptions">exceptions</a>
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*/
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public static void installColors(JComponent c,
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String defaultBgName,
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String defaultFgName)
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{
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Color bg = c.getBackground();
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if (bg == null || bg instanceof UIResource) {
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c.setBackground(UIManager.getColor(defaultBgName));
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}
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Color fg = c.getForeground();
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if (fg == null || fg instanceof UIResource) {
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c.setForeground(UIManager.getColor(defaultFgName));
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}
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}
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/**
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* Convenience method for setting a component's foreground,
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* background and font properties with values from the
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* defaults. The properties are only set if the current
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* value is either {@code null} or a {@code UIResource}.
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*
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* @param c component set to the colors and font on
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* @param defaultBgName key for the background
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* @param defaultFgName key for the foreground
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* @param defaultFontName key for the font
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* @throws NullPointerException as described in
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* <a href="#exceptions">exceptions</a>
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*
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* @see #installColors
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* @see UIManager#getColor
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* @see UIManager#getFont
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*/
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public static void installColorsAndFont(JComponent c,
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String defaultBgName,
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String defaultFgName,
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String defaultFontName) {
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Font f = c.getFont();
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if (f == null || f instanceof UIResource) {
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c.setFont(UIManager.getFont(defaultFontName));
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}
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installColors(c, defaultBgName, defaultFgName);
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}
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/**
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* Convenience method for setting a component's border property with
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* a value from the defaults. The border is only set if the border is
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* {@code null} or an instance of {@code UIResource}.
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*
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* @param c component to set the border on
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* @param defaultBorderName key specifying the border
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* @throws NullPointerException as described in
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* <a href="#exceptions">exceptions</a>
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*/
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public static void installBorder(JComponent c, String defaultBorderName) {
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Border b = c.getBorder();
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if (b == null || b instanceof UIResource) {
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c.setBorder(UIManager.getBorder(defaultBorderName));
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}
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}
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/**
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* Convenience method for uninstalling a border. If the border of
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* the component is a {@code UIResource}, it is set to {@code
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* null}.
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*
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* @param c component to uninstall the border on
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* @throws NullPointerException if {@code c} is {@code null}
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*/
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public static void uninstallBorder(JComponent c) {
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if (c.getBorder() instanceof UIResource) {
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c.setBorder(null);
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}
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}
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/**
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* Convenience method for installing a property with the specified name
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* and value on a component if that property has not already been set
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* by the developer. This method is intended to be used by
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* ui delegate instances that need to specify a default value for a
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* property of primitive type (boolean, int, ..), but do not wish
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* to override a value set by the client. Since primitive property
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* values cannot be wrapped with the {@code UIResource} marker, this method
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* uses private state to determine whether the property has been set
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* by the client.
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*
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* @throws IllegalArgumentException if the specified property is not
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* one which can be set using this method
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* @throws ClassCastException if the property value has not been set
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* by the developer and the type does not match the property's type
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* @throws NullPointerException if {@code c} is {@code null}, or the
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* named property has not been set by the developer and
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* {@code propertyValue} is {@code null}
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* @param c target component to set the property on
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* @param propertyName name of the property to set
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* @param propertyValue value of the property
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* @since 1.5
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*/
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public static void installProperty(JComponent c,
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String propertyName, Object propertyValue) {
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// this is a special case because the JPasswordField's ancestor heirarchy
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// includes a class outside of javax.swing, thus we cannot call setUIProperty
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// directly.
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if (c instanceof JPasswordField) {
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if (!((JPasswordField)c).customSetUIProperty(propertyName, propertyValue)) {
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c.setUIProperty(propertyName, propertyValue);
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}
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} else {
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c.setUIProperty(propertyName, propertyValue);
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}
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}
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/**
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* Convenience method for building an array of {@code
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* KeyBindings}. While this method is not deprecated, developers
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* should instead use {@code ActionMap} and {@code InputMap} for
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* supplying key bindings.
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* <p>
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* This method returns an array of {@code KeyBindings}, one for each
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* alternating {@code key-action} pair in {@code keyBindingList}.
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* A {@code key} can either be a {@code String} in the format
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* specified by the <code>KeyStroke.getKeyStroke</code> method, or
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* a {@code KeyStroke}. The {@code action} part of the pair is a
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* {@code String} that corresponds to the name of the {@code
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* Action}.
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* <p>
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* The following example illustrates creating a {@code KeyBinding} array
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* from six alternating {@code key-action} pairs:
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* <pre>
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* JTextComponent.KeyBinding[] multilineBindings = makeKeyBindings( new Object[] {
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* "UP", DefaultEditorKit.upAction,
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* "DOWN", DefaultEditorKit.downAction,
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* "PAGE_UP", DefaultEditorKit.pageUpAction,
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* "PAGE_DOWN", DefaultEditorKit.pageDownAction,
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* "ENTER", DefaultEditorKit.insertBreakAction,
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* "TAB", DefaultEditorKit.insertTabAction
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* });
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* </pre>
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* If {@code keyBindingList's} length is odd, the last element is
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* ignored.
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* <p>
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* Supplying a {@code null} value for either the {@code key} or
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* {@code action} part of the {@code key-action} pair results in
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* creating a {@code KeyBinding} with the corresponding value
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* {@code null}. As other parts of Swing's expect {@code non-null} values
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* in a {@code KeyBinding}, you should avoid supplying {@code null} as
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* either the {@code key} or {@code action} part of the {@code key-action}
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* pair.
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*
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* @param keyBindingList an array of {@code key-action} pairs
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* @return an array of {@code KeyBindings}
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* @throws NullPointerException if {@code keyBindingList} is {@code null}
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* @throws ClassCastException if the {@code key} part of the pair is
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* not a {@code KeyStroke} or {@code String}, or the
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* {@code action} part of the pair is not a {@code String}
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* @see ActionMap
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* @see InputMap
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* @see KeyStroke#getKeyStroke
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*/
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public static JTextComponent.KeyBinding[] makeKeyBindings(Object[] keyBindingList)
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{
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JTextComponent.KeyBinding[] rv = new JTextComponent.KeyBinding[keyBindingList.length / 2];
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for(int i = 0; i < keyBindingList.length; i += 2) {
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KeyStroke keystroke = (keyBindingList[i] instanceof KeyStroke)
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? (KeyStroke)keyBindingList[i]
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: KeyStroke.getKeyStroke((String)keyBindingList[i]);
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String action = (String)keyBindingList[i+1];
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rv[i / 2] = new JTextComponent.KeyBinding(keystroke, action);
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}
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return rv;
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}
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/**
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* Creates a {@code InputMapUIResource} from <code>keys</code>. This is
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* a convenience method for creating a new {@code InputMapUIResource},
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* invoking {@code loadKeyBindings(map, keys)}, and returning the
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* {@code InputMapUIResource}.
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*
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* @param keys alternating pairs of {@code keystroke-action key}
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* pairs as described in {@link #loadKeyBindings}
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* @return newly created and populated {@code InputMapUIResource}
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* @see #loadKeyBindings
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*
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* @since 1.3
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*/
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public static InputMap makeInputMap(Object[] keys) {
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InputMap retMap = new InputMapUIResource();
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loadKeyBindings(retMap, keys);
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return retMap;
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}
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/**
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* Creates a {@code ComponentInputMapUIResource} from
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* <code>keys</code>. This is a convenience method for creating a
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* new {@code ComponentInputMapUIResource}, invoking {@code
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* loadKeyBindings(map, keys)}, and returning the {@code
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* ComponentInputMapUIResource}.
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*
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* @param c component to create the {@code ComponentInputMapUIResource}
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* with
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* @param keys alternating pairs of {@code keystroke-action key}
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* pairs as described in {@link #loadKeyBindings}
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* @return newly created and populated {@code InputMapUIResource}
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* @throws IllegalArgumentException if {@code c} is {@code null}
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*
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* @see #loadKeyBindings
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* @see ComponentInputMapUIResource
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*
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* @since 1.3
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*/
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public static ComponentInputMap makeComponentInputMap(JComponent c,
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Object[] keys) {
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ComponentInputMap retMap = new ComponentInputMapUIResource(c);
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loadKeyBindings(retMap, keys);
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return retMap;
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}
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/**
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* Populates an {@code InputMap} with the specified bindings.
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* The bindings are supplied as a list of alternating
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* {@code keystroke-action key} pairs. The {@code keystroke} is either
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* an instance of {@code KeyStroke}, or a {@code String}
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* that identifies the {@code KeyStroke} for the binding. Refer
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* to {@code KeyStroke.getKeyStroke(String)} for the specific
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* format. The {@code action key} part of the pair is the key
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* registered in the {@code InputMap} for the {@code KeyStroke}.
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* <p>
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* The following illustrates loading an {@code InputMap} with two
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* {@code key-action} pairs:
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* <pre>
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* LookAndFeel.loadKeyBindings(inputMap, new Object[] {
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* "control X", "cut",
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* "control V", "paste"
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* });
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* </pre>
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* <p>
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* Supplying a {@code null} list of bindings ({@code keys}) does not
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* change {@code retMap} in any way.
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* <p>
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* Specifying a {@code null} {@code action key} results in
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* removing the {@code keystroke's} entry from the {@code InputMap}.
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* A {@code null} {@code keystroke} is ignored.
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*
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* @param retMap {@code InputMap} to add the {@code key-action}
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* pairs to
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* @param keys bindings to add to {@code retMap}
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* @throws NullPointerException if {@code keys} is
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* {@code non-null}, not empty, and {@code retMap} is
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* {@code null}
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*
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* @see KeyStroke#getKeyStroke(String)
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* @see InputMap
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*
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* @since 1.3
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*/
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public static void loadKeyBindings(InputMap retMap, Object[] keys) {
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if (keys != null) {
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for (int counter = 0, maxCounter = keys.length;
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counter < maxCounter; counter++) {
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Object keyStrokeO = keys[counter++];
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KeyStroke ks = (keyStrokeO instanceof KeyStroke) ?
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(KeyStroke)keyStrokeO :
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KeyStroke.getKeyStroke((String)keyStrokeO);
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retMap.put(ks, keys[counter]);
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}
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}
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}
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/**
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* Creates and returns a {@code UIDefault.LazyValue} that loads an
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* image. The returned value is an implementation of {@code
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* UIDefaults.LazyValue}. When {@code createValue} is invoked on
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* the returned object, the image is loaded. If the image is {@code
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* non-null}, it is then wrapped in an {@code Icon} that implements {@code
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* UIResource}. The image is loaded using {@code
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* Class.getResourceAsStream(gifFile)}.
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* <p>
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* This method does not check the arguments in any way. It is
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* strongly recommended that {@code non-null} values are supplied else
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* exceptions may occur when {@code createValue} is invoked on the
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* returned object.
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*
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* @param baseClass {@code Class} used to load the resource
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* @param gifFile path to the image to load
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* @return a {@code UIDefaults.LazyValue}; when resolved the
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* {@code LazyValue} loads the specified image
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* @see UIDefaults.LazyValue
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* @see Icon
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* @see Class#getResourceAsStream(String)
|
|
*/
|
|
public static Object makeIcon(final Class<?> baseClass, final String gifFile) {
|
|
return SwingUtilities2.makeIcon(baseClass, baseClass, gifFile);
|
|
}
|
|
|
|
/**
|
|
* Returns the <code>LayoutStyle</code> for this look
|
|
* and feel. This never returns {@code null}.
|
|
* <p>
|
|
* You generally don't use the <code>LayoutStyle</code> from
|
|
* the look and feel, instead use the <code>LayoutStyle</code>
|
|
* method <code>getInstance</code>.
|
|
*
|
|
* @see LayoutStyle#getInstance
|
|
* @return the <code>LayoutStyle</code> for this look and feel
|
|
* @since 1.6
|
|
*/
|
|
public LayoutStyle getLayoutStyle() {
|
|
return DefaultLayoutStyle.getInstance();
|
|
}
|
|
|
|
/**
|
|
* Invoked when the user attempts an invalid operation,
|
|
* such as pasting into an uneditable <code>JTextField</code>
|
|
* that has focus. The default implementation beeps. Subclasses
|
|
* that wish different behavior should override this and provide
|
|
* the additional feedback.
|
|
*
|
|
* @param component the <code>Component</code> the error occurred in,
|
|
* may be <code>null</code>
|
|
* indicating the error condition is not directly
|
|
* associated with a <code>Component</code>
|
|
* @since 1.4
|
|
*/
|
|
public void provideErrorFeedback(Component component) {
|
|
Toolkit toolkit = null;
|
|
if (component != null) {
|
|
toolkit = component.getToolkit();
|
|
} else {
|
|
toolkit = Toolkit.getDefaultToolkit();
|
|
}
|
|
toolkit.beep();
|
|
} // provideErrorFeedback()
|
|
|
|
/**
|
|
* Returns the value of the specified system desktop property by
|
|
* invoking <code>Toolkit.getDefaultToolkit().getDesktopProperty()</code>.
|
|
* If the value of the specified property is {@code null},
|
|
* {@code fallbackValue} is returned.
|
|
*
|
|
* @param systemPropertyName the name of the system desktop property being queried
|
|
* @param fallbackValue the object to be returned as the value if the system value is null
|
|
* @return the current value of the desktop property
|
|
*
|
|
* @see java.awt.Toolkit#getDesktopProperty
|
|
*
|
|
* @since 1.4
|
|
*/
|
|
public static Object getDesktopPropertyValue(String systemPropertyName, Object fallbackValue) {
|
|
Object value = Toolkit.getDefaultToolkit().getDesktopProperty(systemPropertyName);
|
|
if (value == null) {
|
|
return fallbackValue;
|
|
} else if (value instanceof Color) {
|
|
return new ColorUIResource((Color)value);
|
|
} else if (value instanceof Font) {
|
|
return new FontUIResource((Font)value);
|
|
}
|
|
return value;
|
|
}
|
|
|
|
/**
|
|
* Returns an <code>Icon</code> with a disabled appearance.
|
|
* This method is used to generate a disabled <code>Icon</code> when
|
|
* one has not been specified. For example, if you create a
|
|
* <code>JButton</code> and only specify an <code>Icon</code> via
|
|
* <code>setIcon</code> this method will be called to generate the
|
|
* disabled <code>Icon</code>. If {@code null} is passed as
|
|
* <code>icon</code> this method returns {@code null}.
|
|
* <p>
|
|
* Some look and feels might not render the disabled {@code Icon}, in which
|
|
* case they will ignore this.
|
|
*
|
|
* @param component {@code JComponent} that will display the {@code Icon},
|
|
* may be {@code null}
|
|
* @param icon {@code Icon} to generate the disabled icon from
|
|
* @return disabled {@code Icon}, or {@code null} if a suitable
|
|
* {@code Icon} can not be generated
|
|
* @since 1.5
|
|
*/
|
|
public Icon getDisabledIcon(JComponent component, Icon icon) {
|
|
if (icon instanceof ImageIcon) {
|
|
return new ImageIconUIResource(GrayFilter.
|
|
createDisabledImage(((ImageIcon)icon).getImage()));
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Returns an <code>Icon</code> for use by disabled
|
|
* components that are also selected. This method is used to generate an
|
|
* <code>Icon</code> for components that are in both the disabled and
|
|
* selected states but do not have a specific <code>Icon</code> for this
|
|
* state. For example, if you create a <code>JButton</code> and only
|
|
* specify an <code>Icon</code> via <code>setIcon</code> this method
|
|
* will be called to generate the disabled and selected
|
|
* <code>Icon</code>. If {@code null} is passed as <code>icon</code> this
|
|
* methods returns {@code null}.
|
|
* <p>
|
|
* Some look and feels might not render the disabled and selected
|
|
* {@code Icon}, in which case they will ignore this.
|
|
*
|
|
* @param component {@code JComponent} that will display the {@code Icon},
|
|
* may be {@code null}
|
|
* @param icon {@code Icon} to generate disabled and selected icon from
|
|
* @return disabled and selected icon, or {@code null} if a suitable
|
|
* {@code Icon} can not be generated.
|
|
* @since 1.5
|
|
*/
|
|
public Icon getDisabledSelectedIcon(JComponent component, Icon icon) {
|
|
return getDisabledIcon(component, icon);
|
|
}
|
|
|
|
/**
|
|
* Return a short string that identifies this look and feel, e.g.
|
|
* "CDE/Motif". This string should be appropriate for a menu item.
|
|
* Distinct look and feels should have different names, e.g.
|
|
* a subclass of MotifLookAndFeel that changes the way a few components
|
|
* are rendered should be called "CDE/Motif My Way"; something
|
|
* that would be useful to a user trying to select a L&F from a list
|
|
* of names.
|
|
*
|
|
* @return short identifier for the look and feel
|
|
*/
|
|
public abstract String getName();
|
|
|
|
|
|
/**
|
|
* Return a string that identifies this look and feel. This string
|
|
* will be used by applications/services that want to recognize
|
|
* well known look and feel implementations. Presently
|
|
* the well known names are "Motif", "Windows", "Mac", "Metal". Note
|
|
* that a LookAndFeel derived from a well known superclass
|
|
* that doesn't make any fundamental changes to the look or feel
|
|
* shouldn't override this method.
|
|
*
|
|
* @return identifier for the look and feel
|
|
*/
|
|
public abstract String getID();
|
|
|
|
|
|
/**
|
|
* Return a one line description of this look and feel implementation,
|
|
* e.g. "The CDE/Motif Look and Feel". This string is intended for
|
|
* the user, e.g. in the title of a window or in a ToolTip message.
|
|
*
|
|
* @return short description for the look and feel
|
|
*/
|
|
public abstract String getDescription();
|
|
|
|
|
|
/**
|
|
* Returns {@code true} if the <code>LookAndFeel</code> returned
|
|
* <code>RootPaneUI</code> instances support providing {@code Window}
|
|
* decorations in a <code>JRootPane</code>.
|
|
* <p>
|
|
* The default implementation returns {@code false}, subclasses that
|
|
* support {@code Window} decorations should override this and return
|
|
* {@code true}.
|
|
*
|
|
* @return {@code true} if the {@code RootPaneUI} instances created by
|
|
* this look and feel support client side decorations
|
|
* @see JDialog#setDefaultLookAndFeelDecorated
|
|
* @see JFrame#setDefaultLookAndFeelDecorated
|
|
* @see JRootPane#setWindowDecorationStyle
|
|
* @since 1.4
|
|
*/
|
|
public boolean getSupportsWindowDecorations() {
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* If the underlying platform has a "native" look and feel, and
|
|
* this is an implementation of it, return {@code true}. For
|
|
* example, when the underlying platform is Solaris running CDE
|
|
* a CDE/Motif look and feel implementation would return {@code
|
|
* true}.
|
|
*
|
|
* @return {@code true} if this look and feel represents the underlying
|
|
* platform look and feel
|
|
*/
|
|
public abstract boolean isNativeLookAndFeel();
|
|
|
|
|
|
/**
|
|
* Return {@code true} if the underlying platform supports and or permits
|
|
* this look and feel. This method returns {@code false} if the look
|
|
* and feel depends on special resources or legal agreements that
|
|
* aren't defined for the current platform.
|
|
*
|
|
*
|
|
* @return {@code true} if this is a supported look and feel
|
|
* @see UIManager#setLookAndFeel
|
|
*/
|
|
public abstract boolean isSupportedLookAndFeel();
|
|
|
|
|
|
/**
|
|
* Initializes the look and feel. While this method is public,
|
|
* it should only be invoked by the {@code UIManager} when a
|
|
* look and feel is installed as the current look and feel. This
|
|
* method is invoked before the {@code UIManager} invokes
|
|
* {@code getDefaults}. This method is intended to perform any
|
|
* initialization for the look and feel. Subclasses
|
|
* should do any one-time setup they need here, rather than
|
|
* in a static initializer, because look and feel class objects
|
|
* may be loaded just to discover that {@code isSupportedLookAndFeel()}
|
|
* returns {@code false}.
|
|
*
|
|
* @see #uninitialize
|
|
* @see UIManager#setLookAndFeel
|
|
*/
|
|
public void initialize() {
|
|
}
|
|
|
|
|
|
/**
|
|
* Uninitializes the look and feel. While this method is public,
|
|
* it should only be invoked by the {@code UIManager} when
|
|
* the look and feel is uninstalled. For example,
|
|
* {@code UIManager.setLookAndFeel} invokes this when the look and
|
|
* feel is changed.
|
|
* <p>
|
|
* Subclasses may choose to free up some resources here.
|
|
*
|
|
* @see #initialize
|
|
* @see UIManager#setLookAndFeel
|
|
*/
|
|
public void uninitialize() {
|
|
}
|
|
|
|
/**
|
|
* Returns the look and feel defaults. While this method is public,
|
|
* it should only be invoked by the {@code UIManager} when the
|
|
* look and feel is set as the current look and feel and after
|
|
* {@code initialize} has been invoked.
|
|
*
|
|
* @return the look and feel defaults
|
|
* @see #initialize
|
|
* @see #uninitialize
|
|
* @see UIManager#setLookAndFeel
|
|
*/
|
|
public UIDefaults getDefaults() {
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Returns a string that displays and identifies this
|
|
* object's properties.
|
|
*
|
|
* @return a String representation of this object
|
|
*/
|
|
public String toString() {
|
|
return "[" + getDescription() + " - " + getClass().getName() + "]";
|
|
}
|
|
}
|