/* ButtonModel.java --
   Copyright (C) 2002, 2004 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)
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GNU Classpath is distributed in the hope that it will be useful, but
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

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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
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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
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package javax.swing;

import java.awt.ItemSelectable;
import java.awt.event.ActionListener;
import java.awt.event.ItemListener;

import javax.swing.event.ChangeListener;

/**
 * The data model that is used in all kinds of buttons.
 */
public interface ButtonModel extends ItemSelectable
{  

  /**
   * Returns <code>true</code> if the button is armed, <code>false</code>
   * otherwise.
   *
   * A button is armed, when the user has pressed the mouse over it, but has
   * not yet released the mouse.
   * 
   * @return <code>true</code> if the button is armed, <code>false</code>
   *         otherwise
   *
   * @see #setArmed(boolean)
   */
  boolean isArmed();

  /**
   * Sets the armed flag of the button.
   *
   * A button is armed, when the user has pressed the mouse over it, but has
   * not yet released the mouse.
   *
   * @param b <code>true</code> if the button is armed, <code>false</code>
   *        otherwise
   *
   * @see #isArmed()
   */
  void setArmed(boolean b);

  /**
   * Returns <code>true</code> if the button is enabled, <code>false</code>
   * otherwise.
   *
   * When a button is disabled, it is usually grayed out and the user cannot
   * change its state.
   *
   * @return <code>true</code> if the button is enabled, <code>false</code>
   *         otherwise
   *
   * @see #setEnabled(boolean)
   */
  boolean isEnabled();

  /**
   * Sets the enabled flag of the button.
   *
   * When a button is disabled, it is usually grayed out and the user cannot
   * change its state.
   *
   * @param b <code>true</code> if the button is enabled, <code>false</code>
   *        otherwise
   *
   * @see #isEnabled()
   */
  void setEnabled(boolean b);

  /**
   * Sets the pressed flag of the button.
   *
   * The button usually gets pressed when the user clicks on a button, it will
   * be un-pressed when the user releases the mouse.
   *
   * @param b <code>true</code> if the button is pressed, <code>false</code>
   *        otherwise
   *
   * @see #isPressed()
   */
  void setPressed(boolean b);

  /**
   * Returns <code>true</code> if the button is pressed, <code>false</code>
   * otherwise.
   *
   * The button usually gets pressed when the user clicks on a button, it will
   * be un-pressed when the user releases the mouse.
   *
   * @return <code>true</code> if the button is pressed, <code>false</code>
   *         otherwise
   *
   * @see #setPressed(boolean)
   */
  boolean isPressed();

  /**
   * Removes an {@link ActionListener} from the list of registered listeners.
   *
   * @param l the action listener to remove
   *
   * @see #addActionListener(ActionListener)
   */
  void removeActionListener(ActionListener l);

  /**
   * Adds an {@link ActionListener} to the list of registered listeners.
   *
   * An <code>ActionEvent</code> is usually fired when the user clicks on a
   * button.
   * 
   * @param l the action listener to add
   *
   * @see #removeActionListener(ActionListener)
   */
  void addActionListener(ActionListener l);

  /**
   * Adds an {@link ItemListener} to the list of registered listeners.
   *
   * An <code>ItemEvent</code> is usually fired when a button's selected
   * state changes. This applies only to buttons that support the selected
   * flag.
   *
   * @param l the item listener to add
   *
   * @see #removeItemListener(ItemListener)
   */
  void addItemListener(ItemListener l);

  /**
   * Adds an {@link ItemListener} to the list of registered listeners.
   *
   * @param l the item listener to add
   *
   * @see #removeItemListener(ItemListener)
   */
  void removeItemListener(ItemListener l);

  /**
   * Adds an {@link ChangeListener} to the list of registered listeners.
   *
   * A <code>ChangeEvent</code> is fired when any one of the button's flags
   * changes.
   *
   * @param l the change listener to add
   *
   * @see #removeChangeListener(ChangeListener)
   */
  void addChangeListener(ChangeListener l);

  /**
   * Adds an {@link ChangeListener} to the list of registered listeners.
   *
   * @param l the change listener to add
   *
   * @see #removeChangeListener(ChangeListener)
   */
  void removeChangeListener(ChangeListener l);

  /**
   * Sets the rollover flag of the button.
   *
   * A button is rollover-ed, when the user has moved the mouse over it, but has
   * not yet pressed the mouse.
   *
   * @param b <code>true</code> if the button is rollover, <code>false</code>
   *        otherwise
   *
   * @see #isRollover()
   */
  void setRollover(boolean b);

  /**
   * Returns <code>true</code> if the button is rollover-ed, <code>false</code>
   * otherwise.
   *
   * A button is rollover-ed, when the user has moved the mouse over it, but has
   * not yet pressed the mouse.
   *
   * @return <code>true</code> if the button is rollover, <code>false</code>
   *         otherwise
   *
   * @see #setRollover(boolean)
   */
  boolean isRollover();

  /**
   * Returns the keyboard mnemonic for the button. This specifies a shortcut
   * or accelerator key that can be used to activate the button.
   * 
   * @return the keyboard mnemonic for the button
   *
   * @see #setMnemonic(int)
   */
  int  getMnemonic();

  /**
   * Sets the keyboard mnemonic for the button. This specifies a shortcut
   * or accelerator key that can be used to activate the button.
   * 
   * @param key the keyboard mnemonic for the button
   *
   * @see #getMnemonic()
   */
  void setMnemonic(int key);

  /**
   * Sets the action command for the button. This will be used in
   * <code>ActionEvents</code> fired by the button.
   *
   * @param s the action command to set
   *
   * @see #getActionCommand()
   */
  void setActionCommand(String s);

  /**
   * Returns the action command of the button.
   *
   * @return the action command of the button
   *
   * @see #setActionCommand(String)
   */
  String getActionCommand();

  /**
   * Sets the button group for the button. Some kinds of button (e.g. radio
   * buttons) allow only one button within a button group selected at any one
   * time.
   *
   * @param group the button group to set
   */
  void setGroup(ButtonGroup group);

  /**
   * Sets the selected flag of the button.
   *
   * Some kinds of buttons (e.g. toggle buttons, check boxes, radio buttons)
   * can be in one of two states: selected or unselected. The selected state
   * is usually toggled by clicking on the button.
   * 
   * @param b <code>true</code> if the button is selected, <code>false</code>
   *        otherwise
   *
   * @see #isSelected()
   */
  void setSelected(boolean b);

  /**
   * Returns <code>true</code> if the button is selected, <code>false</code>
   * otherwise.
   *
   * Some kinds of buttons (e.g. toggle buttons, check boxes, radio buttons)
   * can be in one of two states: selected or unselected. The selected state
   * is usually toggled by clicking on the button.
   * 
   * @return <code>true</code> if the button is selected, <code>false</code>
   *         otherwise
   *
   * @see #setSelected(boolean)
   */
  boolean isSelected();
}