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src/java.desktop/share/classes/javax/swing/Action.java

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*** 27,43 **** import java.awt.*; import java.awt.event.*; import java.beans.*; /** ! * The <code>Action</code> interface provides a useful extension to the ! * <code>ActionListener</code> * interface in cases where the same functionality may be accessed by * several controls. * <p> ! * In addition to the <code>actionPerformed</code> method defined by the ! * <code>ActionListener</code> interface, this interface allows the * application to define, in a single place: * <ul> * <li>One or more text strings that describe the function. These strings * can be used, for example, to display the flyover text for a button * or to set the text in a menu item. --- 27,43 ---- import java.awt.*; import java.awt.event.*; import java.beans.*; /** ! * The {@code Action} interface provides a useful extension to the ! * {@code ActionListener} * interface in cases where the same functionality may be accessed by * several controls. * <p> ! * In addition to the {@code actionPerformed} method defined by the ! * {@code ActionListener} interface, this interface allows the * application to define, in a single place: * <ul> * <li>One or more text strings that describe the function. These strings * can be used, for example, to display the flyover text for a button * or to set the text in a menu item.
*** 51,179 **** * then know to disable event generation for that item and to modify the * display accordingly. * </ul> * <p> * This interface can be added to an existing class or used to create an ! * adapter (typically, by subclassing <code>AbstractAction</code>). ! * The <code>Action</code> object ! * can then be added to multiple <code>Action</code>-aware containers ! * and connected to <code>Action</code>-capable * components. The GUI controls can then be activated or ! * deactivated all at once by invoking the <code>Action</code> object's ! * <code>setEnabled</code> method. * <p> ! * Note that <code>Action</code> implementations tend to be more expensive ! * in terms of storage than a typical <code>ActionListener</code>, * which does not offer the benefits of centralized control of * functionality and broadcast of property changes. For this reason, ! * you should take care to only use <code>Action</code>s where their benefits ! * are desired, and use simple <code>ActionListener</code>s elsewhere. * <br> * ! * <h3><a name="buttonActions"></a>Swing Components Supporting <code>Action</code></h3> * <p> ! * Many of Swing's components have an <code>Action</code> property. When ! * an <code>Action</code> is set on a component, the following things * happen: * <ul> ! * <li>The <code>Action</code> is added as an <code>ActionListener</code> to * the component. * <li>The component configures some of its properties to match the ! * <code>Action</code>. ! * <li>The component installs a <code>PropertyChangeListener</code> on the ! * <code>Action</code> so that the component can change its properties ! * to reflect changes in the <code>Action</code>'s properties. * </ul> * <p> * The following table describes the properties used by ! * <code>Swing</code> components that support <code>Actions</code>. * In the table, <em>button</em> refers to any ! * <code>AbstractButton</code> subclass, which includes not only ! * <code>JButton</code> but also classes such as ! * <code>JMenuItem</code>. Unless otherwise stated, a ! * <code>null</code> property value in an <code>Action</code> (or a ! * <code>Action</code> that is <code>null</code>) results in the ! * button's corresponding property being set to <code>null</code>. * * <table border="1" cellpadding="1" cellspacing="0" * summary="Supported Action properties"> * <tr valign="top" align="left"> * <th style="background-color:#CCCCFF" align="left">Component Property * <th style="background-color:#CCCCFF" align="left">Components * <th style="background-color:#CCCCFF" align="left">Action Key * <th style="background-color:#CCCCFF" align="left">Notes * <tr valign="top" align="left"> ! * <td><b><code>enabled</code></b> * <td>All ! * <td>The <code>isEnabled</code> method * <td>&nbsp; * <tr valign="top" align="left"> ! * <td><b><code>toolTipText</code></b> * <td>All ! * <td><code>SHORT_DESCRIPTION</code> * <td>&nbsp; * <tr valign="top" align="left"> ! * <td><b><code>actionCommand</code></b> * <td>All ! * <td><code>ACTION_COMMAND_KEY</code> * <td>&nbsp; * <tr valign="top" align="left"> ! * <td><b><code>mnemonic</code></b> * <td>All buttons ! * <td><code>MNEMONIC_KEY</code> ! * <td>A <code>null</code> value or <code>Action</code> results in the ! * button's <code>mnemonic</code> property being set to ! * <code>'\0'</code>. * <tr valign="top" align="left"> ! * <td><b><code>text</code></b> * <td>All buttons ! * <td><code>NAME</code> * <td>If you do not want the text of the button to mirror that ! * of the <code>Action</code>, set the property ! * <code>hideActionText</code> to <code>true</code>. If ! * <code>hideActionText</code> is <code>true</code>, setting the ! * <code>Action</code> changes the text of the button to ! * <code>null</code> and any changes to <code>NAME</code> ! * are ignored. <code>hideActionText</code> is useful for ! * tool bar buttons that typically only show an <code>Icon</code>. ! * <code>JToolBar.add(Action)</code> sets the property to ! * <code>true</code> if the <code>Action</code> has a ! * non-<code>null</code> value for <code>LARGE_ICON_KEY</code> or ! * <code>SMALL_ICON</code>. * <tr valign="top" align="left"> ! * <td><b><code>displayedMnemonicIndex</code></b> * <td>All buttons ! * <td><code>DISPLAYED_MNEMONIC_INDEX_KEY</code> ! * <td>If the value of <code>DISPLAYED_MNEMONIC_INDEX_KEY</code> is * beyond the bounds of the text, it is ignored. When ! * <code>setAction</code> is called, if the value from the ! * <code>Action</code> is <code>null</code>, the displayed * mnemonic index is not updated. In any subsequent changes to ! * <code>DISPLAYED_MNEMONIC_INDEX_KEY</code>, <code>null</code> * is treated as -1. * <tr valign="top" align="left"> ! * <td><b><code>icon</code></b> ! * <td>All buttons except of <code>JCheckBox</code>, ! * <code>JToggleButton</code> and <code>JRadioButton</code>. ! * <td>either <code>LARGE_ICON_KEY</code> or ! * <code>SMALL_ICON</code> ! * <td>The <code>JMenuItem</code> subclasses only use ! * <code>SMALL_ICON</code>. All other buttons will use ! * <code>LARGE_ICON_KEY</code>; if the value is <code>null</code> they ! * use <code>SMALL_ICON</code>. * <tr valign="top" align="left"> ! * <td><b><code>accelerator</code></b> ! * <td>All <code>JMenuItem</code> subclasses, with the exception of ! * <code>JMenu</code>. ! * <td><code>ACCELERATOR_KEY</code> * <td>&nbsp; * <tr valign="top" align="left"> ! * <td><b><code>selected</code></b> ! * <td><code>JToggleButton</code>, <code>JCheckBox</code>, ! * <code>JRadioButton</code>, <code>JCheckBoxMenuItem</code> and ! * <code>JRadioButtonMenuItem</code> ! * <td><code>SELECTED_KEY</code> * <td>Components that honor this property only use * the value if it is {@code non-null}. For example, if * you set an {@code Action} that has a {@code null} * value for {@code SELECTED_KEY} on a {@code JToggleButton}, the * {@code JToggleButton} will not update it's selected state in --- 51,179 ---- * then know to disable event generation for that item and to modify the * display accordingly. * </ul> * <p> * This interface can be added to an existing class or used to create an ! * adapter (typically, by subclassing {@code AbstractAction}). ! * The {@code Action} object ! * can then be added to multiple {@code Action}-aware containers ! * and connected to {@code Action}-capable * components. The GUI controls can then be activated or ! * deactivated all at once by invoking the {@code Action} object's ! * {@code setEnabled} method. * <p> ! * Note that {@code Action} implementations tend to be more expensive ! * in terms of storage than a typical {@code ActionListener}, * which does not offer the benefits of centralized control of * functionality and broadcast of property changes. For this reason, ! * you should take care to only use {@code Action}s where their benefits ! * are desired, and use simple {@code ActionListener}s elsewhere. * <br> * ! * <h3><a name="buttonActions"></a>Swing Components Supporting {@code Action}</h3> * <p> ! * Many of Swing's components have an {@code Action} property. When ! * an {@code Action} is set on a component, the following things * happen: * <ul> ! * <li>The {@code Action} is added as an {@code ActionListener} to * the component. * <li>The component configures some of its properties to match the ! * {@code Action}. ! * <li>The component installs a {@code PropertyChangeListener} on the ! * {@code Action} so that the component can change its properties ! * to reflect changes in the {@code Action}'s properties. * </ul> * <p> * The following table describes the properties used by ! * {@code Swing} components that support {@code Actions}. * In the table, <em>button</em> refers to any ! * {@code AbstractButton} subclass, which includes not only ! * {@code JButton} but also classes such as ! * {@code JMenuItem}. Unless otherwise stated, a ! * {@code null} property value in an {@code Action} (or a ! * {@code Action} that is {@code null}) results in the ! * button's corresponding property being set to {@code null}. * * <table border="1" cellpadding="1" cellspacing="0" * summary="Supported Action properties"> * <tr valign="top" align="left"> * <th style="background-color:#CCCCFF" align="left">Component Property * <th style="background-color:#CCCCFF" align="left">Components * <th style="background-color:#CCCCFF" align="left">Action Key * <th style="background-color:#CCCCFF" align="left">Notes * <tr valign="top" align="left"> ! * <td><b>{@code enabled}</b> * <td>All ! * <td>The {@code isEnabled} method * <td>&nbsp; * <tr valign="top" align="left"> ! * <td><b>{@code toolTipText}</b> * <td>All ! * <td>{@code SHORT_DESCRIPTION} * <td>&nbsp; * <tr valign="top" align="left"> ! * <td><b>{@code actionCommand}</b> * <td>All ! * <td>{@code ACTION_COMMAND_KEY} * <td>&nbsp; * <tr valign="top" align="left"> ! * <td><b>{@code mnemonic}</b> * <td>All buttons ! * <td>{@code MNEMONIC_KEY} ! * <td>A {@code null} value or {@code Action} results in the ! * button's {@code mnemonic} property being set to ! * {@code '\0'}. * <tr valign="top" align="left"> ! * <td><b>{@code text}</b> * <td>All buttons ! * <td>{@code NAME} * <td>If you do not want the text of the button to mirror that ! * of the {@code Action}, set the property ! * {@code hideActionText} to {@code true}. If ! * {@code hideActionText} is {@code true}, setting the ! * {@code Action} changes the text of the button to ! * {@code null} and any changes to {@code NAME} ! * are ignored. {@code hideActionText} is useful for ! * tool bar buttons that typically only show an {@code Icon}. ! * {@code JToolBar.add(Action)} sets the property to ! * {@code true} if the {@code Action} has a ! * non-{@code null} value for {@code LARGE_ICON_KEY} or ! * {@code SMALL_ICON}. * <tr valign="top" align="left"> ! * <td><b>{@code displayedMnemonicIndex}</b> * <td>All buttons ! * <td>{@code DISPLAYED_MNEMONIC_INDEX_KEY} ! * <td>If the value of {@code DISPLAYED_MNEMONIC_INDEX_KEY} is * beyond the bounds of the text, it is ignored. When ! * {@code setAction} is called, if the value from the ! * {@code Action} is {@code null}, the displayed * mnemonic index is not updated. In any subsequent changes to ! * {@code DISPLAYED_MNEMONIC_INDEX_KEY}, {@code null} * is treated as -1. * <tr valign="top" align="left"> ! * <td><b>{@code icon}</b> ! * <td>All buttons except of {@code JCheckBox}, ! * {@code JToggleButton} and {@code JRadioButton}. ! * <td>either {@code LARGE_ICON_KEY} or ! * {@code SMALL_ICON} ! * <td>The {@code JMenuItem} subclasses only use ! * {@code SMALL_ICON}. All other buttons will use ! * {@code LARGE_ICON_KEY}; if the value is {@code null} they ! * use {@code SMALL_ICON}. * <tr valign="top" align="left"> ! * <td><b>{@code accelerator}</b> ! * <td>All {@code JMenuItem} subclasses, with the exception of ! * {@code JMenu}. ! * <td>{@code ACCELERATOR_KEY} * <td>&nbsp; * <tr valign="top" align="left"> ! * <td><b>{@code selected}</b> ! * <td>{@code JToggleButton}, {@code JCheckBox}, ! * {@code JRadioButton}, {@code JCheckBoxMenuItem} and ! * {@code JRadioButtonMenuItem} ! * <td>{@code SELECTED_KEY} * <td>Components that honor this property only use * the value if it is {@code non-null}. For example, if * you set an {@code Action} that has a {@code null} * value for {@code SELECTED_KEY} on a {@code JToggleButton}, the * {@code JToggleButton} will not update it's selected state in
*** 191,214 **** * use the same {@code Action} that defines a value for the * {@code SELECTED_KEY} property with multiple mutually * exclusive buttons. * </table> * <p> ! * <code>JPopupMenu</code>, <code>JToolBar</code> and <code>JMenu</code> * all provide convenience methods for creating a component and setting the ! * <code>Action</code> on the corresponding component. Refer to each of * these classes for more information. * <p> ! * <code>Action</code> uses <code>PropertyChangeListener</code> to ! * inform listeners the <code>Action</code> has changed. The beans ! * specification indicates that a <code>null</code> property name can * be used to indicate multiple values have changed. By default Swing ! * components that take an <code>Action</code> do not handle such a ! * change. To indicate that Swing should treat <code>null</code> * according to the beans specification set the system property ! * <code>swing.actions.reconfigureOnNull</code> to the <code>String</code> ! * value <code>true</code>. * * @author Georges Saab * @see AbstractAction * @since 1.2 */ --- 191,214 ---- * use the same {@code Action} that defines a value for the * {@code SELECTED_KEY} property with multiple mutually * exclusive buttons. * </table> * <p> ! * {@code JPopupMenu}, {@code JToolBar} and {@code JMenu} * all provide convenience methods for creating a component and setting the ! * {@code Action} on the corresponding component. Refer to each of * these classes for more information. * <p> ! * {@code Action} uses {@code PropertyChangeListener} to ! * inform listeners the {@code Action} has changed. The beans ! * specification indicates that a {@code null} property name can * be used to indicate multiple values have changed. By default Swing ! * components that take an {@code Action} do not handle such a ! * change. To indicate that Swing should treat {@code null} * according to the beans specification set the system property ! * {@code swing.actions.reconfigureOnNull} to the {@code String} ! * value {@code true}. * * @author Georges Saab * @see AbstractAction * @since 1.2 */
*** 221,337 **** /** * Not currently used. */ public static final String DEFAULT = "Default"; /** ! * The key used for storing the <code>String</code> name * for the action, used for a menu or button. */ public static final String NAME = "Name"; /** ! * The key used for storing a short <code>String</code> * description for the action, used for tooltip text. */ public static final String SHORT_DESCRIPTION = "ShortDescription"; /** ! * The key used for storing a longer <code>String</code> * description for the action, could be used for context-sensitive help. */ public static final String LONG_DESCRIPTION = "LongDescription"; /** ! * The key used for storing a small <code>Icon</code>, such ! * as <code>ImageIcon</code>. This is typically used with ! * menus such as <code>JMenuItem</code>. ! * <p> ! * If the same <code>Action</code> is used with menus and buttons you'll ! * typically specify both a <code>SMALL_ICON</code> and a ! * <code>LARGE_ICON_KEY</code>. The menu will use the ! * <code>SMALL_ICON</code> and the button will use the ! * <code>LARGE_ICON_KEY</code>. */ public static final String SMALL_ICON = "SmallIcon"; /** ! * The key used to determine the command <code>String</code> for the ! * <code>ActionEvent</code> that will be created when an ! * <code>Action</code> is going to be notified as the result of ! * residing in a <code>Keymap</code> associated with a ! * <code>JComponent</code>. */ public static final String ACTION_COMMAND_KEY = "ActionCommandKey"; /** ! * The key used for storing a <code>KeyStroke</code> to be used as the * accelerator for the action. * * @since 1.3 */ public static final String ACCELERATOR_KEY="AcceleratorKey"; /** ! * The key used for storing an <code>Integer</code> that corresponds to ! * one of the <code>KeyEvent</code> key codes. The value is * commonly used to specify a mnemonic. For example: ! * <code>myAction.putValue(Action.MNEMONIC_KEY, KeyEvent.VK_A)</code> ! * sets the mnemonic of <code>myAction</code> to 'a', while * <code>myAction.putValue(Action.MNEMONIC_KEY, KeyEvent.getExtendedKeyCodeForChar('\u0444'))</code> ! * sets the mnemonic of <code>myAction</code> to Cyrillic letter "Ef". * * @since 1.3 */ public static final String MNEMONIC_KEY="MnemonicKey"; /** ! * The key used for storing a <code>Boolean</code> that corresponds * to the selected state. This is typically used only for components * that have a meaningful selection state. For example, ! * <code>JRadioButton</code> and <code>JCheckBox</code> make use of ! * this but instances of <code>JMenu</code> don't. * <p> * This property differs from the others in that it is both read * by the component and set by the component. For example, ! * if an <code>Action</code> is attached to a <code>JCheckBox</code> ! * the selected state of the <code>JCheckBox</code> will be set from ! * that of the <code>Action</code>. If the user clicks on the ! * <code>JCheckBox</code> the selected state of the <code>JCheckBox</code> ! * <b>and</b> the <code>Action</code> will <b>both</b> be updated. * <p> * Note: the value of this field is prefixed with 'Swing' to ! * avoid possible collisions with existing <code>Actions</code>. * * @since 1.6 */ public static final String SELECTED_KEY = "SwingSelectedKey"; /** ! * The key used for storing an <code>Integer</code> that corresponds ! * to the index in the text (identified by the <code>NAME</code> * property) that the decoration for a mnemonic should be rendered at. If * the value of this property is greater than or equal to the length of * the text, it will treated as -1. * <p> * Note: the value of this field is prefixed with 'Swing' to ! * avoid possible collisions with existing <code>Actions</code>. * * @see AbstractButton#setDisplayedMnemonicIndex * @since 1.6 */ public static final String DISPLAYED_MNEMONIC_INDEX_KEY = "SwingDisplayedMnemonicIndexKey"; /** ! * The key used for storing an <code>Icon</code>. This is typically ! * used by buttons, such as <code>JButton</code> and ! * <code>JToggleButton</code>. ! * <p> ! * If the same <code>Action</code> is used with menus and buttons you'll ! * typically specify both a <code>SMALL_ICON</code> and a ! * <code>LARGE_ICON_KEY</code>. The menu will use the ! * <code>SMALL_ICON</code> and the button the <code>LARGE_ICON_KEY</code>. * <p> * Note: the value of this field is prefixed with 'Swing' to ! * avoid possible collisions with existing <code>Actions</code>. * * @since 1.6 */ public static final String LARGE_ICON_KEY = "SwingLargeIconKey"; --- 221,337 ---- /** * Not currently used. */ public static final String DEFAULT = "Default"; /** ! * The key used for storing the {@code String} name * for the action, used for a menu or button. */ public static final String NAME = "Name"; /** ! * The key used for storing a short {@code String} * description for the action, used for tooltip text. */ public static final String SHORT_DESCRIPTION = "ShortDescription"; /** ! * The key used for storing a longer {@code String} * description for the action, could be used for context-sensitive help. */ public static final String LONG_DESCRIPTION = "LongDescription"; /** ! * The key used for storing a small {@code Icon}, such ! * as {@code ImageIcon}. This is typically used with ! * menus such as {@code JMenuItem}. ! * <p> ! * If the same {@code Action} is used with menus and buttons you'll ! * typically specify both a {@code SMALL_ICON} and a ! * {@code LARGE_ICON_KEY}. The menu will use the ! * {@code SMALL_ICON} and the button will use the ! * {@code LARGE_ICON_KEY}. */ public static final String SMALL_ICON = "SmallIcon"; /** ! * The key used to determine the command {@code String} for the ! * {@code ActionEvent} that will be created when an ! * {@code Action} is going to be notified as the result of ! * residing in a {@code Keymap} associated with a ! * {@code JComponent}. */ public static final String ACTION_COMMAND_KEY = "ActionCommandKey"; /** ! * The key used for storing a {@code KeyStroke} to be used as the * accelerator for the action. * * @since 1.3 */ public static final String ACCELERATOR_KEY="AcceleratorKey"; /** ! * The key used for storing an {@code Integer} that corresponds to ! * one of the {@code KeyEvent} key codes. The value is * commonly used to specify a mnemonic. For example: ! * {@code myAction.putValue(Action.MNEMONIC_KEY, KeyEvent.VK_A)} ! * sets the mnemonic of {@code myAction} to 'a', while * <code>myAction.putValue(Action.MNEMONIC_KEY, KeyEvent.getExtendedKeyCodeForChar('\u0444'))</code> ! * sets the mnemonic of {@code myAction} to Cyrillic letter "Ef". * * @since 1.3 */ public static final String MNEMONIC_KEY="MnemonicKey"; /** ! * The key used for storing a {@code Boolean} that corresponds * to the selected state. This is typically used only for components * that have a meaningful selection state. For example, ! * {@code JRadioButton} and {@code JCheckBox} make use of ! * this but instances of {@code JMenu} don't. * <p> * This property differs from the others in that it is both read * by the component and set by the component. For example, ! * if an {@code Action} is attached to a {@code JCheckBox} ! * the selected state of the {@code JCheckBox} will be set from ! * that of the {@code Action}. If the user clicks on the ! * {@code JCheckBox} the selected state of the {@code JCheckBox} ! * <b>and</b> the {@code Action} will <b>both</b> be updated. * <p> * Note: the value of this field is prefixed with 'Swing' to ! * avoid possible collisions with existing {@code Actions}. * * @since 1.6 */ public static final String SELECTED_KEY = "SwingSelectedKey"; /** ! * The key used for storing an {@code Integer} that corresponds ! * to the index in the text (identified by the {@code NAME} * property) that the decoration for a mnemonic should be rendered at. If * the value of this property is greater than or equal to the length of * the text, it will treated as -1. * <p> * Note: the value of this field is prefixed with 'Swing' to ! * avoid possible collisions with existing {@code Actions}. * * @see AbstractButton#setDisplayedMnemonicIndex * @since 1.6 */ public static final String DISPLAYED_MNEMONIC_INDEX_KEY = "SwingDisplayedMnemonicIndexKey"; /** ! * The key used for storing an {@code Icon}. This is typically ! * used by buttons, such as {@code JButton} and ! * {@code JToggleButton}. ! * <p> ! * If the same {@code Action} is used with menus and buttons you'll ! * typically specify both a {@code SMALL_ICON} and a ! * {@code LARGE_ICON_KEY}. The menu will use the ! * {@code SMALL_ICON} and the button the {@code LARGE_ICON_KEY}. * <p> * Note: the value of this field is prefixed with 'Swing' to ! * avoid possible collisions with existing {@code Actions}. * * @since 1.6 */ public static final String LARGE_ICON_KEY = "SwingLargeIconKey";
*** 345,394 **** */ public Object getValue(String key); /** * Sets one of this object's properties * using the associated key. If the value has ! * changed, a <code>PropertyChangeEvent</code> is sent * to listeners. * ! * @param key a <code>String</code> containing the key ! * @param value an <code>Object</code> value */ public void putValue(String key, Object value); /** ! * Sets the enabled state of the <code>Action</code>. When enabled, * any component associated with this object is active and ! * able to fire this object's <code>actionPerformed</code> method. ! * If the value has changed, a <code>PropertyChangeEvent</code> is sent * to listeners. * ! * @param b true to enable this <code>Action</code>, false to disable it */ public void setEnabled(boolean b); /** ! * Returns the enabled state of the <code>Action</code>. When enabled, * any component associated with this object is active and ! * able to fire this object's <code>actionPerformed</code> method. * ! * @return true if this <code>Action</code> is enabled */ public boolean isEnabled(); /** ! * Adds a <code>PropertyChange</code> listener. Containers and attached * components use these methods to register interest in this ! * <code>Action</code> object. When its enabled state or other property * changes, the registered listeners are informed of the change. * ! * @param listener a <code>PropertyChangeListener</code> object */ public void addPropertyChangeListener(PropertyChangeListener listener); /** ! * Removes a <code>PropertyChange</code> listener. * ! * @param listener a <code>PropertyChangeListener</code> object * @see #addPropertyChangeListener */ public void removePropertyChangeListener(PropertyChangeListener listener); } --- 345,394 ---- */ public Object getValue(String key); /** * Sets one of this object's properties * using the associated key. If the value has ! * changed, a {@code PropertyChangeEvent} is sent * to listeners. * ! * @param key a {@code String} containing the key ! * @param value an {@code Object} value */ public void putValue(String key, Object value); /** ! * Sets the enabled state of the {@code Action}. When enabled, * any component associated with this object is active and ! * able to fire this object's {@code actionPerformed} method. ! * If the value has changed, a {@code PropertyChangeEvent} is sent * to listeners. * ! * @param b true to enable this {@code Action}, false to disable it */ public void setEnabled(boolean b); /** ! * Returns the enabled state of the {@code Action}. When enabled, * any component associated with this object is active and ! * able to fire this object's {@code actionPerformed} method. * ! * @return true if this {@code Action} is enabled */ public boolean isEnabled(); /** ! * Adds a {@code PropertyChange} listener. Containers and attached * components use these methods to register interest in this ! * {@code Action} object. When its enabled state or other property * changes, the registered listeners are informed of the change. * ! * @param listener a {@code PropertyChangeListener} object */ public void addPropertyChangeListener(PropertyChangeListener listener); /** ! * Removes a {@code PropertyChange} listener. * ! * @param listener a {@code PropertyChangeListener} object * @see #addPropertyChangeListener */ public void removePropertyChangeListener(PropertyChangeListener listener); }
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