/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/**
* A semantic event which indicates that a component-defined action occurred.
* This high-level event is generated by a component (such as a
* <code>Button</code>) when
* the component-specific action occurs (such as being pressed).
* The event is passed to every <code>ActionListener</code> object
* that registered to receive such events using the component's
* <code>addActionListener</code> method.
* <p>
* <b>Note:</b> To invoke an <code>ActionEvent</code> on a
* <code>Button</code> using the keyboard, use the Space bar.
* <P>
* The object that implements the <code>ActionListener</code> interface
* gets this <code>ActionEvent</code> when the event occurs. The listener
* is therefore spared the details of processing individual mouse movements
* and mouse clicks, and can instead process a "meaningful" (semantic)
* event like "button pressed".
* <p>
* An unspecified behavior will be caused if the {@code id} parameter
* of any particular {@code ActionEvent} instance is not
* in the range from {@code ACTION_FIRST} to {@code ACTION_LAST}.
*
* @see ActionListener
* @see <a href="http://java.sun.com/docs/books/tutorial/uiswing/events/actionlistener.html">Tutorial: How to Write an Action Listener</a>
*
* @author Carl Quinn
* @since 1.1
*/
/**
* The shift modifier. An indicator that the shift key was held
* down during the event.
*/
/**
* The control modifier. An indicator that the control key was held
* down during the event.
*/
/**
* The meta modifier. An indicator that the meta key was held
* down during the event.
*/
/**
* The alt modifier. An indicator that the alt key was held
* down during the event.
*/
/**
* The first number in the range of ids used for action events.
*/
/**
* The last number in the range of ids used for action events.
*/
/**
* This event id indicates that a meaningful action occured.
*/
/**
* The nonlocalized string that gives more details
* of what actually caused the event.
* This information is very specific to the component
* that fired it.
* @serial
* @see #getActionCommand
*/
/**
* Timestamp of when this event occurred. Because an ActionEvent is a high-
* level, semantic event, the timestamp is typically the same as an
* underlying InputEvent.
*
* @serial
* @see #getWhen
*/
long when;
/**
* This represents the key modifier that was selected,
* and is used to determine the state of the selected key.
* If no modifier has been selected it will default to
* zero.
*
* @serial
* @see #getModifiers
*/
int modifiers;
/*
* JDK 1.1 serialVersionUID
*/
/**
* Constructs an <code>ActionEvent</code> object.
* <p>
* This method throws an
* <code>IllegalArgumentException</code> if <code>source</code>
* is <code>null</code>.
* A <code>null</code> <code>command</code> string is legal,
* but not recommended.
*
* @param source The object that originated the event
* @param id An integer that identifies the event.
* For information on allowable values, see
* the class description for {@link ActionEvent}
* @param command A string that may specify a command (possibly one
* of several) associated with the event
* @throws IllegalArgumentException if <code>source</code> is null
* @see #getSource()
* @see #getID()
* @see #getActionCommand()
*/
}
/**
* Constructs an <code>ActionEvent</code> object with modifier keys.
* <p>
* This method throws an
* <code>IllegalArgumentException</code> if <code>source</code>
* is <code>null</code>.
* A <code>null</code> <code>command</code> string is legal,
* but not recommended.
*
* @param source The object that originated the event
* @param id An integer that identifies the event.
* For information on allowable values, see
* the class description for {@link ActionEvent}
* @param command A string that may specify a command (possibly one
* of several) associated with the event
* @param modifiers The modifier keys down during event
* (shift, ctrl, alt, meta).
* Passing negative parameter is not recommended.
* Zero value means that no modifiers were passed
* @throws IllegalArgumentException if <code>source</code> is null
* @see #getSource()
* @see #getID()
* @see #getActionCommand()
* @see #getModifiers()
*/
}
/**
* Constructs an <code>ActionEvent</code> object with the specified
* modifier keys and timestamp.
* <p>
* This method throws an
* <code>IllegalArgumentException</code> if <code>source</code>
* is <code>null</code>.
* A <code>null</code> <code>command</code> string is legal,
* but not recommended.
*
* @param source The object that originated the event
* @param id An integer that identifies the event.
* For information on allowable values, see
* the class description for {@link ActionEvent}
* @param command A string that may specify a command (possibly one
* of several) associated with the event
* @param modifiers The modifier keys down during event
* (shift, ctrl, alt, meta).
* Passing negative parameter is not recommended.
* Zero value means that no modifiers were passed
* @param when A long that gives the time the event occurred.
* Passing negative or zero value
* is not recommended
* @throws IllegalArgumentException if <code>source</code> is null
* @see #getSource()
* @see #getID()
* @see #getActionCommand()
* @see #getModifiers()
* @see #getWhen()
*
* @since 1.4
*/
int modifiers) {
this.actionCommand = command;
}
/**
* Returns the command string associated with this action.
* This string allows a "modal" component to specify one of several
* commands, depending on its state. For example, a single button might
* toggle between "show details" and "hide details". The source object
* and the event would be the same in each case, but the command string
* would identify the intended action.
* <p>
* Note that if a <code>null</code> command string was passed
* to the constructor for this <code>ActionEvent</code>, this
* this method returns <code>null</code>.
*
* @return the string identifying the command for this event
*/
return actionCommand;
}
/**
* Returns the timestamp of when this event occurred. Because an
* ActionEvent is a high-level, semantic event, the timestamp is typically
* the same as an underlying InputEvent.
*
* @return this event's timestamp
* @since 1.4
*/
public long getWhen() {
return when;
}
/**
* Returns the modifier keys held down during this action event.
*
* @return the bitwise-or of the modifier constants
*/
public int getModifiers() {
return modifiers;
}
/**
* Returns a parameter string identifying this action event.
* This method is useful for event-logging and for debugging.
*
* @return a string identifying the event and its associated command
*/
switch(id) {
case ACTION_PERFORMED:
typeStr = "ACTION_PERFORMED";
break;
default:
typeStr = "unknown type";
}
}
}