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338 lines
12 KiB
338 lines
12 KiB
/*
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* Copyright (c) 1999, 2008, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*/
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package java.awt.event;
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import java.awt.AWTEvent;
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import java.awt.Component;
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import java.awt.Container;
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/**
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* An event which indicates a change to the <code>Component</code>
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* hierarchy to which <code>Component</code> belongs.
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* <ul>
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* <li>Hierarchy Change Events (HierarchyListener)
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* <ul>
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* <li> addition of an ancestor
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* <li> removal of an ancestor
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* <li> hierarchy made displayable
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* <li> hierarchy made undisplayable
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* <li> hierarchy shown on the screen (both visible and displayable)
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* <li> hierarchy hidden on the screen (either invisible or undisplayable)
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* </ul>
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* <li>Ancestor Reshape Events (HierarchyBoundsListener)
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* <ul>
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* <li> an ancestor was resized
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* <li> an ancestor was moved
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* </ul>
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* </ul>
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* <p>
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* Hierarchy events are provided for notification purposes ONLY.
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* The AWT will automatically handle changes to the hierarchy internally so
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* that GUI layout and displayability works properly regardless of whether a
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* program is receiving these events or not.
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* <p>
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* This event is generated by a Container object (such as a Panel) when the
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* Container is added, removed, moved, or resized, and passed down the
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* hierarchy. It is also generated by a Component object when that object's
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* <code>addNotify</code>, <code>removeNotify</code>, <code>show</code>, or
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* <code>hide</code> method is called. The {@code ANCESTOR_MOVED} and
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* {@code ANCESTOR_RESIZED}
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* events are dispatched to every <code>HierarchyBoundsListener</code> or
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* <code>HierarchyBoundsAdapter</code> object which registered to receive
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* such events using the Component's <code>addHierarchyBoundsListener</code>
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* method. (<code>HierarchyBoundsAdapter</code> objects implement the <code>
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* HierarchyBoundsListener</code> interface.) The {@code HIERARCHY_CHANGED} events are
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* dispatched to every <code>HierarchyListener</code> object which registered
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* to receive such events using the Component's <code>addHierarchyListener
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* </code> method. Each such listener object gets this <code>HierarchyEvent
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* </code> when the event occurs.
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* <p>
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* An unspecified behavior will be caused if the {@code id} parameter
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* of any particular {@code HierarchyEvent} instance is not
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* in the range from {@code HIERARCHY_FIRST} to {@code HIERARCHY_LAST}.
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* <br>
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* The {@code changeFlags} parameter of any {@code HierarchyEvent} instance takes one of the following
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* values:
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* <ul>
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* <li> {@code HierarchyEvent.PARENT_CHANGED}
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* <li> {@code HierarchyEvent.DISPLAYABILITY_CHANGED}
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* <li> {@code HierarchyEvent.SHOWING_CHANGED}
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* </ul>
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* Assigning the value different from listed above will cause unspecified behavior.
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*
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* @author David Mendenhall
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* @see HierarchyListener
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* @see HierarchyBoundsAdapter
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* @see HierarchyBoundsListener
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* @since 1.3
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*/
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public class HierarchyEvent extends AWTEvent {
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/*
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* serialVersionUID
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*/
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private static final long serialVersionUID = -5337576970038043990L;
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/**
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* Marks the first integer id for the range of hierarchy event ids.
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*/
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public static final int HIERARCHY_FIRST = 1400; // 1300 used by sun.awt.windows.ModalityEvent
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/**
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* The event id indicating that modification was made to the
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* entire hierarchy tree.
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*/
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public static final int HIERARCHY_CHANGED = HIERARCHY_FIRST;
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/**
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* The event id indicating an ancestor-Container was moved.
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*/
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public static final int ANCESTOR_MOVED = 1 + HIERARCHY_FIRST;
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/**
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* The event id indicating an ancestor-Container was resized.
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*/
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public static final int ANCESTOR_RESIZED = 2 + HIERARCHY_FIRST;
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/**
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* Marks the last integer id for the range of ancestor event ids.
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*/
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public static final int HIERARCHY_LAST = ANCESTOR_RESIZED;
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/**
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* A change flag indicates that the <code>HIERARCHY_CHANGED</code> event
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* was generated by a reparenting operation.
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*/
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public static final int PARENT_CHANGED = 0x1;
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/**
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* A change flag indicates that the <code>HIERARCHY_CHANGED</code> event
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* was generated due to the changing of the hierarchy displayability.
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* To discern the
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* current displayability of the hierarchy, call the
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* <code>Component.isDisplayable</code> method. Displayability changes occur
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* in response to explicit or implicit calls of the
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* <code>Component.addNotify</code> and
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* <code>Component.removeNotify</code> methods.
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*
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* @see java.awt.Component#isDisplayable()
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* @see java.awt.Component#addNotify()
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* @see java.awt.Component#removeNotify()
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*/
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public static final int DISPLAYABILITY_CHANGED = 0x2;
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/**
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* A change flag indicates that the <code>HIERARCHY_CHANGED</code> event
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* was generated due to the changing of the hierarchy showing state.
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* To discern the
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* current showing state of the hierarchy, call the
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* <code>Component.isShowing</code> method. Showing state changes occur
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* when either the displayability or visibility of the
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* hierarchy occurs. Visibility changes occur in response to explicit
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* or implicit calls of the <code>Component.show</code> and
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* <code>Component.hide</code> methods.
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*
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* @see java.awt.Component#isShowing()
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* @see java.awt.Component#addNotify()
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* @see java.awt.Component#removeNotify()
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* @see java.awt.Component#show()
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* @see java.awt.Component#hide()
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*/
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public static final int SHOWING_CHANGED = 0x4;
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Component changed;
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Container changedParent;
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long changeFlags;
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/**
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* Constructs an <code>HierarchyEvent</code> object to identify a
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* change in the <code>Component</code> hierarchy.
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* <p>This method throws an
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* <code>IllegalArgumentException</code> if <code>source</code>
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* is <code>null</code>.
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*
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* @param source The <code>Component</code> object that
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* originated the event
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* @param id An integer indicating the type of event.
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* For information on allowable values, see
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* the class description for {@link HierarchyEvent}
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* @param changed The <code>Component</code> at the top of
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* the hierarchy which was changed
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* @param changedParent The parent of the <code>changed</code> component.
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* This
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* may be the parent before or after the
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* change, depending on the type of change
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* @throws IllegalArgumentException if <code>source</code> is {@code null}
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* @see #getSource()
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* @see #getID()
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* @see #getChanged()
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* @see #getChangedParent()
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*/
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public HierarchyEvent(Component source, int id, Component changed,
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Container changedParent) {
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super(source, id);
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this.changed = changed;
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this.changedParent = changedParent;
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}
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/**
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* Constructs an <code>HierarchyEvent</code> object to identify
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* a change in the <code>Component</code> hierarchy.
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* <p> This method throws an
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* <code>IllegalArgumentException</code> if <code>source</code>
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* is <code>null</code>.
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*
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* @param source The <code>Component</code> object that
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* originated the event
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* @param id An integer indicating the type of event.
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* For information on allowable values, see
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* the class description for {@link HierarchyEvent}
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* @param changed The <code>Component</code> at the top
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* of the hierarchy which was changed
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* @param changedParent The parent of the <code>changed</code> component.
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* This
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* may be the parent before or after the
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* change, depending on the type of change
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* @param changeFlags A bitmask which indicates the type(s) of
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* the <code>HIERARCHY_CHANGED</code> events
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* represented in this event object.
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* For information on allowable values, see
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* the class description for {@link HierarchyEvent}
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* @throws IllegalArgumentException if <code>source</code> is null
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* @see #getSource()
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* @see #getID()
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* @see #getChanged()
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* @see #getChangedParent()
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* @see #getChangeFlags()
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*/
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public HierarchyEvent(Component source, int id, Component changed,
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Container changedParent, long changeFlags) {
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super(source, id);
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this.changed = changed;
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this.changedParent = changedParent;
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this.changeFlags = changeFlags;
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}
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/**
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* Returns the originator of the event.
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*
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* @return the <code>Component</code> object that originated
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* the event, or <code>null</code> if the object is not a
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* <code>Component</code>.
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*/
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public Component getComponent() {
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return (source instanceof Component) ? (Component)source : null;
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}
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/**
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* Returns the Component at the top of the hierarchy which was
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* changed.
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*
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* @return the changed Component
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*/
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public Component getChanged() {
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return changed;
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}
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/**
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* Returns the parent of the Component returned by <code>
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* getChanged()</code>. For a HIERARCHY_CHANGED event where the
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* change was of type PARENT_CHANGED via a call to <code>
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* Container.add</code>, the parent returned is the parent
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* after the add operation. For a HIERARCHY_CHANGED event where
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* the change was of type PARENT_CHANGED via a call to <code>
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* Container.remove</code>, the parent returned is the parent
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* before the remove operation. For all other events and types,
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* the parent returned is the parent during the operation.
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*
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* @return the parent of the changed Component
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*/
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public Container getChangedParent() {
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return changedParent;
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}
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/**
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* Returns a bitmask which indicates the type(s) of
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* HIERARCHY_CHANGED events represented in this event object.
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* The bits have been bitwise-ored together.
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*
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* @return the bitmask, or 0 if this is not an HIERARCHY_CHANGED
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* event
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*/
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public long getChangeFlags() {
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return changeFlags;
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}
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/**
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* Returns a parameter string identifying this event.
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* This method is useful for event-logging and for debugging.
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*
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* @return a string identifying the event and its attributes
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*/
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public String paramString() {
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String typeStr;
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switch(id) {
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case ANCESTOR_MOVED:
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typeStr = "ANCESTOR_MOVED ("+changed+","+changedParent+")";
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break;
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case ANCESTOR_RESIZED:
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typeStr = "ANCESTOR_RESIZED ("+changed+","+changedParent+")";
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break;
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case HIERARCHY_CHANGED: {
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typeStr = "HIERARCHY_CHANGED (";
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boolean first = true;
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if ((changeFlags & PARENT_CHANGED) != 0) {
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first = false;
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typeStr += "PARENT_CHANGED";
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}
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if ((changeFlags & DISPLAYABILITY_CHANGED) != 0) {
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if (first) {
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first = false;
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} else {
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typeStr += ",";
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}
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typeStr += "DISPLAYABILITY_CHANGED";
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}
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if ((changeFlags & SHOWING_CHANGED) != 0) {
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if (first) {
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first = false;
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} else {
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typeStr += ",";
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}
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typeStr += "SHOWING_CHANGED";
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}
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if (!first) {
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typeStr += ",";
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}
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typeStr += changed + "," + changedParent + ")";
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break;
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}
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default:
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typeStr = "unknown type";
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}
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return typeStr;
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}
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}
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