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package javax.swing;

A ComponentInputMap is an InputMap
associated with a particular JComponent.
The component is automatically notified whenever
the ComponentInputMap changes.
ComponentInputMaps are used for
WHEN_IN_FOCUSED_WINDOW bindings.
Author:
Scott Violet
Since:
1.3/**
 * A <code>ComponentInputMap</code> is an <code>InputMap</code>
 * associated with a particular <code>JComponent</code>.
 * The component is automatically notified whenever
 * the <code>ComponentInputMap</code> changes.
 * <code>ComponentInputMap</code>s are used for
 * <code>WHEN_IN_FOCUSED_WINDOW</code> bindings.
 *
 * @author Scott Violet
 * @since 1.3
 */
@SuppressWarnings("serial") // Field data not serializable across versions
public class ComponentInputMap extends InputMap {
    
Component binding is created for. /** Component binding is created for. */
    private JComponent          component;

    
Creates a ComponentInputMap associated with the
specified component.
Params:
component –  a non-null JComponent
Throws:
IllegalArgumentException –  if component is null/**
     * Creates a <code>ComponentInputMap</code> associated with the
     * specified component.
     *
     * @param component  a non-null <code>JComponent</code>
     * @throws IllegalArgumentException  if <code>component</code> is null
     */
    public ComponentInputMap(JComponent component) {
        this.component = component;
        if (component == null) {
            throw new IllegalArgumentException("ComponentInputMaps must be associated with a non-null JComponent");
        }
    }

    
Sets the parent, which must be a ComponentInputMap
associated with the same component as this
ComponentInputMap.
Params:
map –  a ComponentInputMap
Throws:
IllegalArgumentException –  if map
        is not a ComponentInputMap
        or is not associated with the same component/**
     * Sets the parent, which must be a <code>ComponentInputMap</code>
     * associated with the same component as this
     * <code>ComponentInputMap</code>.
     *
     * @param map  a <code>ComponentInputMap</code>
     *
     * @throws IllegalArgumentException  if <code>map</code>
     *         is not a <code>ComponentInputMap</code>
     *         or is not associated with the same component
     */
    public void setParent(InputMap map) {
        if (getParent() == map) {
            return;
        }
        if (map != null && (!(map instanceof ComponentInputMap) ||
                 ((ComponentInputMap)map).getComponent() != getComponent())) {
            throw new IllegalArgumentException("ComponentInputMaps must have a parent ComponentInputMap associated with the same component");
        }
        super.setParent(map);
        getComponent().componentInputMapChanged(this);
    }

    
Returns the component the InputMap was created for. 
Returns:
the component the InputMap was created for./**
     * Returns the component the {@code InputMap} was created for.
     *
     * @return the component the {@code InputMap} was created for.
     */
    public JComponent getComponent() {
        return component;
    }

    
Adds a binding for keyStroke to actionMapKey.
If actionMapKey is null, this removes the current binding
for keyStroke.
/**
     * Adds a binding for <code>keyStroke</code> to <code>actionMapKey</code>.
     * If <code>actionMapKey</code> is null, this removes the current binding
     * for <code>keyStroke</code>.
     */
    public void put(KeyStroke keyStroke, Object actionMapKey) {
        super.put(keyStroke, actionMapKey);
        if (getComponent() != null) {
            getComponent().componentInputMapChanged(this);
        }
    }

    
Removes the binding for key from this object.
/**
     * Removes the binding for <code>key</code> from this object.
     */
    public void remove(KeyStroke key) {
        super.remove(key);
        if (getComponent() != null) {
            getComponent().componentInputMapChanged(this);
        }
    }

    
Removes all the mappings from this object.
/**
     * Removes all the mappings from this object.
     */
    public void clear() {
        int oldSize = size();
        super.clear();
        if (oldSize > 0 && getComponent() != null) {
            getComponent().componentInputMapChanged(this);
        }
    }
}