/* LookAndFeel.java -- Copyright (C) 2002, 2004, 2005, 2006, 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. */ package javax.swing; import java.awt.Color; import java.awt.Component; import java.awt.Font; import java.awt.Toolkit; import java.net.URL; import javax.swing.border.Border; import javax.swing.plaf.ComponentInputMapUIResource; import javax.swing.plaf.IconUIResource; import javax.swing.plaf.InputMapUIResource; import javax.swing.plaf.UIResource; import javax.swing.plaf.metal.MetalLookAndFeel; import javax.swing.text.JTextComponent; /** * A look-and-feel controls most aspects of the appearance and * operation of user interface components in javax.swing. A * cross-platform look-and-feel (the {@link MetalLookAndFeel}) is provided. * * @see UIManager#getInstalledLookAndFeels() * @see UIManager#setLookAndFeel(LookAndFeel) */ public abstract class LookAndFeel { /** * Creates and returns a look-and-feel specific defaults table. This method * is called once by {@link UIManager#setLookAndFeel(LookAndFeel)} and * shouldn't be called again (as it creates a large table of defaults). * * @return The UI defaults. */ public UIDefaults getDefaults() { return null; } /** * Returns a description of the look and feel. * * @return A description of the look and feel. */ public abstract String getDescription(); /** * Returns the value of Toolkit.getDefaultToolkit() * .getDesktopProperty(systemPropertyName), or * fallbackValue if no such property is defined. * * @param systemPropertyName the system property name. * @param fallbackValue the fallback value. * * @return The property value or fallbackValue. */ public static Object getDesktopPropertyValue(String systemPropertyName, Object fallbackValue) { Object value = Toolkit.getDefaultToolkit().getDesktopProperty( systemPropertyName); return value != null ? value : fallbackValue; } /** * Returns an identifier for the look and feel. * * @return An identifier for the look and feel. */ public abstract String getID(); /** * Returns the name for the look and feel. * * @return The name for the look and feel. */ public abstract String getName(); /** * Returns true when the look-and-feel supports window * decorations, and false otherwise. This default implementation * always returns false and needs to be overridden when the * derived look-and-feel supports this. * * @return false. * * @since 1.4 */ public boolean getSupportsWindowDecorations() { return false; } /** * Initializes the look-and-feel. The * {@link UIManager#setLookAndFeel(LookAndFeel)} method calls this method * before the first call (and typically the only call) to * {@link #getDefaults()}. This default implementation does nothing, but * subclasses can override this behaviour. */ public void initialize() { // We do nothing here. This method is meant to be overridden by // LookAndFeel implementations. } /** * Convenience method for installing a component's default {@link Border} * object on the specified component if either the border is currently * null or already an instance of {@link UIResource}. * * @param c the component (null not permitted). * @param defaultBorderName the border name (for lookup in the UIDefaults * table). */ public static void installBorder(JComponent c, String defaultBorderName) { Border b = c.getBorder(); if (b == null || b instanceof UIResource) c.setBorder(UIManager.getBorder(defaultBorderName)); } /** * Convenience method for initializing a component's foreground and * background color properties with values from the current defaults table. * * @param c the component (null not permitted). * @param defaultBgName the key for the background color in the UIDefaults * table. * @param defaultFgName the key for the foreground color in the UIDefaults * table. */ public static void installColors(JComponent c, String defaultBgName, String defaultFgName) { // Install background. Color bg = c.getBackground(); if (bg == null || bg instanceof UIResource) c.setBackground(UIManager.getColor(defaultBgName)); // Install foreground. Color fg = c.getForeground(); if (fg == null || fg instanceof UIResource) c.setForeground(UIManager.getColor(defaultFgName)); } /** * Convenience method for initializing a component's foreground, background * and font properties with values from the current defaults table. * * @param component the component (null not permitted). * @param defaultBgName the key for the background color in the UIDefaults * table. * @param defaultFgName the key for the foreground color in the UIDefaults * table. * @param defaultFontName the key for the font in the UIDefaults table. */ public static void installColorsAndFont(JComponent component, String defaultBgName, String defaultFgName, String defaultFontName) { // Install colors. installColors(component, defaultBgName, defaultFgName); // Install font. Font f = component.getFont(); if (f == null || f instanceof UIResource) component.setFont(UIManager.getFont(defaultFontName)); } /** * Returns true if the look-and-feel is the "native" * look-and-feel for the current platform, and false otherwise. * A native look-and-feel emulates the appearance and behaviour of the * default windowing system on the host operating system. * * @return A flag indicating whether or not this is the native look and feel * for the current platform. */ public abstract boolean isNativeLookAndFeel(); /** * Returns true if the look-and-feel is supported on the * current operating system, and false otherwise. This * mechanism is provided so that it is possible to prevent a look-and-feel * from being used on some operating systems (usually for legal, not * technical, reasons). * * @return A flag indicating whether or not the look-and-feel is supported * on the current platform. */ public abstract boolean isSupportedLookAndFeel(); /** * Loads the bindings in keys into retMap. Does not remove existing entries * from retMap. keys describes the InputMap, every even indexed * item is either a KeyStroke or a String representing a KeyStroke and every * odd indexed item is the Object associated with that KeyStroke in an * ActionMap. * * @param retMap the InputMap into which we load bindings * @param keys the Object array describing the InputMap as above */ public static void loadKeyBindings(InputMap retMap, Object[] keys) { if (keys == null) return; for (int i = 0; i < keys.length - 1; i += 2) { Object key = keys[i]; KeyStroke keyStroke; if (key instanceof KeyStroke) keyStroke = (KeyStroke) key; else keyStroke = KeyStroke.getKeyStroke((String) key); retMap.put(keyStroke, keys[i + 1]); } } /** * Creates a ComponentInputMap from keys. * keys describes the InputMap, every even indexed * item is either a KeyStroke or a String representing a KeyStroke and every * odd indexed item is the Object associated with that KeyStroke in an * ActionMap. * * @param c the JComponent associated with the ComponentInputMap * @param keys the Object array describing the InputMap as above * * @return A new input map. */ public static ComponentInputMap makeComponentInputMap(JComponent c, Object[] keys) { ComponentInputMap retMap = new ComponentInputMapUIResource(c); loadKeyBindings(retMap, keys); return retMap; } /** * Utility method that creates a UIDefaults.LazyValue that creates an * ImageIcon UIResource for the specified gifFile filename. * * @param baseClass the base class for accessing the icon resource. * @param gifFile the file name. * * @return A {@link UIDefaults.LazyValue} that serves up an * {@link IconUIResource}. */ public static Object makeIcon(Class baseClass, String gifFile) { final URL file = baseClass.getResource(gifFile); return new UIDefaults.LazyValue() { public Object createValue(UIDefaults table) { return new IconUIResource(new ImageIcon(file)); } }; } /** * Creates a InputMap from keys. * keys describes the InputMap, every even indexed * item is either a KeyStroke or a String representing a KeyStroke and every * odd indexed item is the Object associated with that KeyStroke in an * ActionMap. * * @param keys the Object array describing the InputMap as above * * @return A new input map. */ public static InputMap makeInputMap(Object[] keys) { InputMap retMap = new InputMapUIResource(); loadKeyBindings(retMap, keys); return retMap; } /** * Convenience method for building lists of KeyBindings. * keyBindingList is an array of KeyStroke-Action pairs where * even indexed elements are KeyStrokes or Strings representing KeyStrokes * and odd indexed elements are the associated Actions. * * @param keyBindingList the array of KeyStroke-Action pairs * @return a JTextComponent.KeyBinding array */ public static JTextComponent.KeyBinding[] makeKeyBindings( Object[] keyBindingList) { JTextComponent.KeyBinding[] retBindings = new JTextComponent.KeyBinding[keyBindingList.length / 2]; for (int i = 0; i < keyBindingList.length - 1; i += 2) { KeyStroke stroke; if (keyBindingList[i] instanceof KeyStroke) stroke = (KeyStroke) keyBindingList[i]; else stroke = KeyStroke.getKeyStroke((String) keyBindingList[i]); retBindings[i / 2] = new JTextComponent.KeyBinding(stroke, (String) keyBindingList[i + 1]); } return retBindings; } /** * Invoked when the user attempts an invalid operation. The default * implementation just beeps. Subclasses that wish to change this need to * override this method. * * @param component the component the error occured in */ public void provideErrorFeedback(Component component) { Toolkit.getDefaultToolkit().beep(); } /** * Returns a string that displays and identifies this object's properties. * * @return string containing the description and class name. */ public String toString() { return getDescription() + " " + getClass().getName(); } /** * UIManager.setLookAndFeel calls this method just before we're replaced by * a new default look and feel. */ public void uninitialize() { // We do nothing here. This method is meant to be overridden by // LookAndFeel implementations. } /** * Convenience method for un-installing a component's default border on the * specified component if the border is currently an instance of UIResource. * * @param c the component (null not permitted). */ public static void uninstallBorder(JComponent c) { if (c.getBorder() instanceof UIResource) c.setBorder(null); } /** * This methods installs a UI property if it hasn't already been set by an * application. This method is used by UI delegates that install a default * value for a property with a primitive type but do not want to override * a value that has been set by an application. * * The supported properties depend on the actual type of the component and * are listed in the table below. The supported properties are of course * inherited to subclasses. * * * * * * * * * * * * * * * *
TypeSupported properties
JComponentopaque, autoscrolls
AbstractButtonborderPainted, rolloverEnabled, iconTextGap, * contentAreaFilled
JDesktopPanedragMode
JSplitPanedividerSize, oneTouchExpandable
JTablerowHeight
JTreerowHeight, scrollsOnExpand, showsRootHandles
* * @param c the component to install the property to * @param propertyName the name of the property * @param value the value of the property * * @throws IllegalArgumentException if the specified property cannot be set * by this method * @throws ClassCastException if the property value does not match the * property type * @throws NullPointerException if c or * propertyValue is null * * @since 1.5 */ public static void installProperty(JComponent c, String propertyName, Object value) { c.setUIProperty(propertyName, value); } }