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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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 * particular file as subject to the "Classpath" exception as provided

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 * 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).

 *

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 * 2 along with this work; if not, write to the Free Software Foundation,

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package javax.swing;

import java.awt.event.*;

import java.awt.*;

import javax.swing.event.*;

/**

 * State model for buttons.

 * <p>

 * This model is used for regular buttons, as well as check boxes

 * and radio buttons, which are special kinds of buttons. In practice,

 * a button's UI takes the responsibility of calling methods on its

 * model to manage the state, as detailed below:

 * <p>

 * In simple terms, pressing and releasing the mouse over a regular

 * button triggers the button and causes and <code>ActionEvent</code>

 * to be fired. The same behavior can be produced via a keyboard key

 * defined by the look and feel of the button (typically the SPACE BAR).

 * Pressing and releasing this key while the button has

 * focus will give the same results. For check boxes and radio buttons, the

 * mouse or keyboard equivalent sequence just described causes the button

 * to become selected.

 * <p>

 * In details, the state model for buttons works as follows

 * when used with the mouse:

 * <br>

 * Pressing the mouse on top of a button makes the model both

 * armed and pressed. As long as the mouse remains down,

 * the model remains pressed, even if the mouse moves

 * outside the button. On the contrary, the model is only

 * armed while the mouse remains pressed within the bounds of

 * the button (it can move in or out of the button, but the model

 * is only armed during the portion of time spent within the button).

 * A button is triggered, and an <code>ActionEvent</code> is fired,

 * when the mouse is released while the model is armed

 * - meaning when it is released over top of the button after the mouse

 * has previously been pressed on that button (and not already released).

 * Upon mouse release, the model becomes unarmed and unpressed.

 * <p>

 * In details, the state model for buttons works as follows

 * when used with the keyboard:

 * <br>

 * Pressing the look and feel defined keyboard key while the button

 * has focus makes the model both armed and pressed. As long as this key

 * remains down, the model remains in this state. Releasing the key sets

 * the model to unarmed and unpressed, triggers the button, and causes an

 * <code>ActionEvent</code> to be fired.

 *

 * @author Jeff Dinkins

 */

public interface ButtonModel extends ItemSelectable {

    /**

     * Indicates partial commitment towards triggering the

     * button.

     *

     * @return <code>true</code> if the button is armed,

     *         and ready to be triggered

     * @see #setArmed

     */

    boolean isArmed();

    /**

     * Indicates if the button has been selected. Only needed for

     * certain types of buttons - such as radio buttons and check boxes.

     *

     * @return <code>true</code> if the button is selected

     */

    boolean isSelected();

    /**

     * Indicates if the button can be selected or triggered by

     * an input device, such as a mouse pointer.

     *

     * @return <code>true</code> if the button is enabled

     */

    boolean isEnabled();

    /**

     * Indicates if the button is pressed.

     *

     * @return <code>true</code> if the button is pressed

     */

    boolean isPressed();

    /**

     * Indicates that the mouse is over the button.

     *

     * @return <code>true</code> if the mouse is over the button

     */

    boolean isRollover();

    /**

     * Marks the button as armed or unarmed.

     *

     * @param b whether or not the button should be armed

     */

    public void setArmed(boolean b);

    /**

     * Selects or deselects the button.

     *

     * @param b <code>true</code> selects the button,

     *          <code>false</code> deselects the button

     */

    public void setSelected(boolean b);

    /**

     * Enables or disables the button.

     *

     * @param b whether or not the button should be enabled

     * @see #isEnabled

     */

    public void setEnabled(boolean b);

    /**

     * Sets the button to pressed or unpressed.

     *

     * @param b whether or not the button should be pressed

     * @see #isPressed

     */

    public void setPressed(boolean b);

    /**

     * Sets or clears the button's rollover state

     *

     * @param b whether or not the button is in the rollover state

     * @see #isRollover

     */

    public void setRollover(boolean b);

    /**

     * Sets the keyboard mnemonic (shortcut key or

     * accelerator key) for the button.

     *

     * @param key an int specifying the accelerator key

     */

    public void setMnemonic(int key);

    /**

     * Gets the keyboard mnemonic for the button.

     *

     * @return an int specifying the accelerator key

     * @see #setMnemonic

     */

    public int  getMnemonic();

    /**

     * Sets the action command string that gets sent as part of the

     * <code>ActionEvent</code> when the button is triggered.

     *

     * @param s the <code>String</code> that identifies the generated event

     * @see #getActionCommand

     * @see java.awt.event.ActionEvent#getActionCommand

     */

    public void setActionCommand(String s);

    /**

     * Returns the action command string for the button.

     *

     * @return the <code>String</code> that identifies the generated event

     * @see #setActionCommand

     */

    public String getActionCommand();

    /**

     * Identifies the group the button belongs to --

     * needed for radio buttons, which are mutually

     * exclusive within their group.

     *

     * @param group the <code>ButtonGroup</code> the button belongs to

     */

    public void setGroup(ButtonGroup group);

    /**

     * Adds an <code>ActionListener</code> to the model.

     *

     * @param l the listener to add

     */

    void addActionListener(ActionListener l);

    /**

     * Removes an <code>ActionListener</code> from the model.

     *

     * @param l the listener to remove

     */

    void removeActionListener(ActionListener l);

    /**

     * Adds an <code>ItemListener</code> to the model.

     *

     * @param l the listener to add

     */

    void addItemListener(ItemListener l);

    /**

     * Removes an <code>ItemListener</code> from the model.

     *

     * @param l the listener to remove

     */

    void removeItemListener(ItemListener l);

    /**

     * Adds a <code>ChangeListener</code> to the model.

     *

     * @param l the listener to add

     */

    void addChangeListener(ChangeListener l);

    /**

     * Removes a <code>ChangeListener</code> from the model.

     *

     * @param l the listener to remove

     */

    void removeChangeListener(ChangeListener l);

}