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DefaultButtonModel.java
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1998-02-26
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/*
* @(#)DefaultButtonModel.java 1.21 98/02/02
*
* Copyright (c) 1997 Sun Microsystems, Inc. All Rights Reserved.
*
* This software is the confidential and proprietary information of Sun
* Microsystems, Inc. ("Confidential Information"). You shall not
* disclose such Confidential Information and shall use it only in
* accordance with the terms of the license agreement you entered into
* with Sun.
*
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
* SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
* IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
* PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES
* SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
* THIS SOFTWARE OR ITS DERIVATIVES.
*
*/
package com.sun.java.swing;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.io.Serializable;
import java.util.EventListener;
import com.sun.java.swing.event.*;
/**
* The default implementation of a Button component's
* data model.
* <p>
* Warning: serialized objects of this class will not be compatible with
* future swing releases. The current serialization support is appropriate
* for short term storage or RMI between Swing1.0 applications. It will
* not be possible to load serialized Swing1.0 objects with future releases
* of Swing. The JDK1.2 release of Swing will be the compatibility
* baseline for the serialized form of Swing objects.
*
* @version 1.21 02/02/98
* @author Jeff Dinkins
*/
public class DefaultButtonModel implements ButtonModel, Serializable {
protected int stateMask = 0;
protected String actionCommand = null;
protected ButtonGroup group = null;
protected int mnemonic = 0;
/**
* Only one ChangeEvent is needed per button model instance since the
* event's only state is the source property. The source of events
* generated is always "this".
*/
protected transient ChangeEvent changeEvent = null;
protected EventListenerList listenerList = new EventListenerList();
/**
* Constructs a JButtonModel
*
*/
public DefaultButtonModel() {
stateMask = 0;
setEnabled(true);
}
/**
* Indicates if the button can be selected or not by
* an input device (such as a mouse pointer).
*
* @see ButtonModel#setArmed
*/
public final static int ARMED = 1 << 0;
/**
* Indicates if the button has been selected. Only needed for
* certain types of buttons - such as RadioButton or Checkbox.
*/
public final static int SELECTED = 1 << 1;
/**
* Indicates partial commitment towards choosing the
* button.
*/
public final static int PRESSED = 1 << 2;
/**
* Indicates whether the button is currently enabled.
*/
public final static int ENABLED = 1 << 3;
/**
* Indicates that the mouse is over the button.
*/
public final static int ROLLOVER = 1 << 4;
/**
* Sets the actionCommand that gets sent when the putton is pressed.
*/
public void setActionCommand(String actionCommand) {
this.actionCommand = actionCommand;
}
/**
* Returns the action command for this button.
*/
public String getActionCommand() {
return actionCommand;
}
/**
* Returns whether the button is "armed".
*
* @return true if the button is armed, and it can be selected
* @see ButtonModel#setArmed
*/
public boolean isArmed() {
return (stateMask & ARMED) != 0;
}
/**
* Checks if the button is selected.
*/
public boolean isSelected() {
return (stateMask & SELECTED) != 0;
}
/**
* Checks if the button is disabled.
*/
public boolean isEnabled() {
return (stateMask & ENABLED) != 0;
}
/**
* Checks if the button is pressed.
*/
public boolean isPressed() {
return (stateMask & PRESSED) != 0;
}
/**
* Checks if the button is rolled over.
*/
public boolean isRollover() {
return (stateMask & ROLLOVER) != 0;
}
/**
* Identifies the button as "armed".
*
* @param b true to arm the button so it can be selected
* @see ButtonModel#setArmed
*/
public void setArmed(boolean b) {
if((isArmed() == b) || !isEnabled()) {
return;
}
if (b) {
stateMask |= ARMED;
} else {
stateMask &= ~ARMED;
}
fireStateChanged();
}
/**
* Sets the button to be enabled or disabled state
*/
public void setEnabled(boolean b) {
if(isEnabled() == b) {
return;
}
if (b) {
stateMask |= ENABLED;
} else {
stateMask &= ~ENABLED;
}
fireStateChanged();
}
/**
* Sets the selected state of the button.
* @param b true selects the toggle button,
* false deselects the toggle button.
*/
public void setSelected(boolean b) {
if (this.isSelected() == b) {
return;
}
if (b) {
stateMask |= SELECTED;
} else {
stateMask &= ~SELECTED;
}
fireItemStateChanged(
new ItemEvent(this,
ItemEvent.ITEM_STATE_CHANGED,
this,
b ? ItemEvent.SELECTED : ItemEvent.DESELECTED));
fireStateChanged();
}
/**
* Sets the button to pressed state
*/
public void setPressed(boolean b) {
if((isPressed() == b) || !isEnabled()) {
return;
}
if (b) {
stateMask |= PRESSED;
} else {
stateMask &= ~PRESSED;
}
if(!isPressed() && isArmed()) {
fireActionPerformed(
new ActionEvent(this, ActionEvent.ACTION_PERFORMED,
getActionCommand())
);
}
fireStateChanged();
}
/**
* Sets the button to the rollover state
*/
public void setRollover(boolean b) {
if((isRollover() == b) || !isEnabled()) {
return;
}
if (b) {
stateMask |= ROLLOVER;
} else {
stateMask &= ~ROLLOVER;
}
fireStateChanged();
}
/**
* Sets the keyboard mnemonic for this model
*/
public void setMnemonic(int key) {
mnemonic = key;
fireStateChanged();
}
/**
* Gets the keyboard mnemonic for this model
*/
public int getMnemonic() {
return mnemonic;
}
/**
* Adds a ChangeListener to the button.
*/
public void addChangeListener(ChangeListener l) {
listenerList.add(ChangeListener.class, l);
}
/**
* Removes a ChangeListener from the button.
*/
public void removeChangeListener(ChangeListener l) {
listenerList.remove(ChangeListener.class, l);
}
/*
* Notify all listeners that have registered interest for
* notification on this event type. The event instance
* is lazily created using the parameters passed into
* the fire method.
* @see EventListenerList
*/
protected void fireStateChanged() {
// Guaranteed to return a non-null array
Object[] listeners = listenerList.getListenerList();
// Process the listeners last to first, notifying
// those that are interested in this event
for (int i = listeners.length-2; i>=0; i-=2) {
if (listeners[i]==ChangeListener.class) {
// Lazily create the event:
if (changeEvent == null)
changeEvent = new ChangeEvent(this);
((ChangeListener)listeners[i+1]).stateChanged(changeEvent);
}
}
}
/**
* adds an ActionListener to the button
*/
public void addActionListener(ActionListener l) {
listenerList.add(ActionListener.class, l);
}
/**
* removes an ActionListener from the button
*/
public void removeActionListener(ActionListener l) {
listenerList.remove(ActionListener.class, l);
}
/*
* Notify all listeners that have registered interest for
* notification on this event type. The event instance
* is lazily created using the parameters passed into
* the fire method.
* @see EventListenerList
*/
protected void fireActionPerformed(ActionEvent e) {
// Guaranteed to return a non-null array
Object[] listeners = listenerList.getListenerList();
// Process the listeners last to first, notifying
// those that are interested in this event
for (int i = listeners.length-2; i>=0; i-=2) {
if (listeners[i]==ActionListener.class) {
// Lazily create the event:
// if (changeEvent == null)
// changeEvent = new ChangeEvent(this);
((ActionListener)listeners[i+1]).actionPerformed(e);
}
}
}
/**
* adds an ItemListener to the button
*/
public void addItemListener(ItemListener l) {
listenerList.add(ItemListener.class, l);
}
/**
* removes an ItemListener from the button
*/
public void removeItemListener(ItemListener l) {
listenerList.remove(ItemListener.class, l);
}
/*
* Notify all listeners that have registered interest for
* notification on this event type. The event instance
* is lazily created using the parameters passed into
* the fire method.
* @see EventListenerList
*/
protected void fireItemStateChanged(ItemEvent e) {
// Guaranteed to return a non-null array
Object[] listeners = listenerList.getListenerList();
// Process the listeners last to first, notifying
// those that are interested in this event
for (int i = listeners.length-2; i>=0; i-=2) {
if (listeners[i]==ItemListener.class) {
// Lazily create the event:
// if (changeEvent == null)
// changeEvent = new ChangeEvent(this);
((ItemListener)listeners[i+1]).itemStateChanged(e);
}
}
}
public Object[] getSelectedObjects() {
return null;
}
public void setGroup(ButtonGroup group) {
this.group = group;
}
}