Java example source code file (DefaultButtonModel.java)
The DefaultButtonModel.java Java example source code/*
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* published by the Free Software Foundation. Oracle designates this
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* 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.
*
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*/
package javax.swing;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.io.Serializable;
import java.util.EventListener;
import javax.swing.event.*;
/**
* The default implementation of a <code>Button component's data model.
* <p>
* <strong>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 applications running
* the same version of Swing. As of 1.4, support for long term storage
* of all JavaBeans™
* has been added to the <code>java.beans package.
* Please see {@link java.beans.XMLEncoder}.
*
* @author Jeff Dinkins
*/
public class DefaultButtonModel implements ButtonModel, Serializable {
/** The bitmask used to store the state of the button. */
protected int stateMask = 0;
/** The action command string fired by the button. */
protected String actionCommand = null;
/** The button group that the button belongs to. */
protected ButtonGroup group = null;
/** The button's mnemonic. */
protected int mnemonic = 0;
/**
* Only one <code>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;
/** Stores the listeners on this model. */
protected EventListenerList listenerList = new EventListenerList();
// controls the usage of the MenuItem.disabledAreNavigable UIDefaults
// property in the setArmed() method
private boolean menuItem = false;
/**
* Constructs a <code>DefaultButtonModel.
*
*/
public DefaultButtonModel() {
stateMask = 0;
setEnabled(true);
}
/**
* Identifies the "armed" bit in the bitmask, which
* indicates partial commitment towards choosing/triggering
* the button.
*/
public final static int ARMED = 1 << 0;
/**
* Identifies the "selected" bit in the bitmask, which
* indicates that the button has been selected. Only needed for
* certain types of buttons - such as radio button or check box.
*/
public final static int SELECTED = 1 << 1;
/**
* Identifies the "pressed" bit in the bitmask, which
* indicates that the button is pressed.
*/
public final static int PRESSED = 1 << 2;
/**
* Identifies the "enabled" bit in the bitmask, which
* indicates that the button can be selected by
* an input device (such as a mouse pointer).
*/
public final static int ENABLED = 1 << 3;
/**
* Identifies the "rollover" bit in the bitmask, which
* indicates that the mouse is over the button.
*/
public final static int ROLLOVER = 1 << 4;
/**
* {@inheritDoc}
*/
public void setActionCommand(String actionCommand) {
this.actionCommand = actionCommand;
}
/**
* {@inheritDoc}
*/
public String getActionCommand() {
return actionCommand;
}
/**
* {@inheritDoc}
*/
public boolean isArmed() {
return (stateMask & ARMED) != 0;
}
/**
* {@inheritDoc}
*/
public boolean isSelected() {
return (stateMask & SELECTED) != 0;
}
/**
* {@inheritDoc}
*/
public boolean isEnabled() {
return (stateMask & ENABLED) != 0;
}
/**
* {@inheritDoc}
*/
public boolean isPressed() {
return (stateMask & PRESSED) != 0;
}
/**
* {@inheritDoc}
*/
public boolean isRollover() {
return (stateMask & ROLLOVER) != 0;
}
/**
* {@inheritDoc}
*/
public void setArmed(boolean b) {
if(isMenuItem() &&
UIManager.getBoolean("MenuItem.disabledAreNavigable")) {
if ((isArmed() == b)) {
return;
}
} else {
if ((isArmed() == b) || !isEnabled()) {
return;
}
}
if (b) {
stateMask |= ARMED;
} else {
stateMask &= ~ARMED;
}
fireStateChanged();
}
/**
* {@inheritDoc}
*/
public void setEnabled(boolean b) {
if(isEnabled() == b) {
return;
}
if (b) {
stateMask |= ENABLED;
} else {
stateMask &= ~ENABLED;
// unarm and unpress, just in case
stateMask &= ~ARMED;
stateMask &= ~PRESSED;
}
fireStateChanged();
}
/**
* {@inheritDoc}
*/
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();
}
/**
* {@inheritDoc}
*/
public void setPressed(boolean b) {
if((isPressed() == b) || !isEnabled()) {
return;
}
if (b) {
stateMask |= PRESSED;
} else {
stateMask &= ~PRESSED;
}
if(!isPressed() && isArmed()) {
int modifiers = 0;
AWTEvent currentEvent = EventQueue.getCurrentEvent();
if (currentEvent instanceof InputEvent) {
modifiers = ((InputEvent)currentEvent).getModifiers();
} else if (currentEvent instanceof ActionEvent) {
modifiers = ((ActionEvent)currentEvent).getModifiers();
}
fireActionPerformed(
new ActionEvent(this, ActionEvent.ACTION_PERFORMED,
getActionCommand(),
EventQueue.getMostRecentEventTime(),
modifiers));
}
fireStateChanged();
}
/**
* {@inheritDoc}
*/
public void setRollover(boolean b) {
if((isRollover() == b) || !isEnabled()) {
return;
}
if (b) {
stateMask |= ROLLOVER;
} else {
stateMask &= ~ROLLOVER;
}
fireStateChanged();
}
/**
* {@inheritDoc}
*/
public void setMnemonic(int key) {
mnemonic = key;
fireStateChanged();
}
/**
* {@inheritDoc}
*/
public int getMnemonic() {
return mnemonic;
}
/**
* {@inheritDoc}
*/
public void addChangeListener(ChangeListener l) {
listenerList.add(ChangeListener.class, l);
}
/**
* {@inheritDoc}
*/
public void removeChangeListener(ChangeListener l) {
listenerList.remove(ChangeListener.class, l);
}
/**
* Returns an array of all the change listeners
* registered on this <code>DefaultButtonModel.
*
* @return all of this model's <code>ChangeListeners
* or an empty
* array if no change listeners are currently registered
*
* @see #addChangeListener
* @see #removeChangeListener
*
* @since 1.4
*/
public ChangeListener[] getChangeListeners() {
return listenerList.getListeners(ChangeListener.class);
}
/**
* Notifies all listeners that have registered interest for
* notification on this event type. The event instance
* is created lazily.
*
* @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);
}
}
}
/**
* {@inheritDoc}
*/
public void addActionListener(ActionListener l) {
listenerList.add(ActionListener.class, l);
}
/**
* {@inheritDoc}
*/
public void removeActionListener(ActionListener l) {
listenerList.remove(ActionListener.class, l);
}
/**
* Returns an array of all the action listeners
* registered on this <code>DefaultButtonModel.
*
* @return all of this model's <code>ActionListeners
* or an empty
* array if no action listeners are currently registered
*
* @see #addActionListener
* @see #removeActionListener
*
* @since 1.4
*/
public ActionListener[] getActionListeners() {
return listenerList.getListeners(ActionListener.class);
}
/**
* Notifies all listeners that have registered interest for
* notification on this event type.
*
* @param e the <code>ActionEvent to deliver to listeners
* @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);
}
}
}
/**
* {@inheritDoc}
*/
public void addItemListener(ItemListener l) {
listenerList.add(ItemListener.class, l);
}
/**
* {@inheritDoc}
*/
public void removeItemListener(ItemListener l) {
listenerList.remove(ItemListener.class, l);
}
/**
* Returns an array of all the item listeners
* registered on this <code>DefaultButtonModel.
*
* @return all of this model's <code>ItemListeners
* or an empty
* array if no item listeners are currently registered
*
* @see #addItemListener
* @see #removeItemListener
*
* @since 1.4
*/
public ItemListener[] getItemListeners() {
return listenerList.getListeners(ItemListener.class);
}
/**
* Notifies all listeners that have registered interest for
* notification on this event type.
*
* @param e the <code>ItemEvent to deliver to listeners
* @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);
}
}
}
/**
* Returns an array of all the objects currently registered as
* <code>FooListeners
* upon this model.
* <code>FooListeners
* are registered using the <code>addFooListener method.
* <p>
* You can specify the <code>listenerType argument
* with a class literal, such as <code>FooListener.class.
* For example, you can query a <code>DefaultButtonModel
* instance <code>m
* for its action listeners
* with the following code:
*
* <pre>ActionListener[] als = (ActionListener[])(m.getListeners(ActionListener.class));
*
* If no such listeners exist,
* this method returns an empty array.
*
* @param listenerType the type of listeners requested;
* this parameter should specify an interface
* that descends from <code>java.util.EventListener
* @return an array of all objects registered as
* <code>FooListeners
* on this model,
* or an empty array if no such
* listeners have been added
* @exception ClassCastException if <code>listenerType doesn't
* specify a class or interface that implements
* <code>java.util.EventListener
*
* @see #getActionListeners
* @see #getChangeListeners
* @see #getItemListeners
*
* @since 1.3
*/
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