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380 lines
10 KiB
Java
380 lines
10 KiB
Java
/* InputEvent.java -- common superclass of component input events
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Copyright (C) 1999, 2002 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.awt.event;
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import java.awt.Component;
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import gnu.java.awt.EventModifier;
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/**
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* This is the common superclass for all component input classes. These are
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* passed to listeners before the component, so that listeners can consume
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* the event before it does its default behavior.
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*
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* @author Aaron M. Renn <arenn@urbanophile.com>
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* @see KeyEvent
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* @see KeyAdapter
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* @see MouseEvent
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* @see MouseAdapter
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* @see MouseMotionAdapter
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* @see MouseWheelEvent
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* @since 1.1
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* @status updated to 1.4
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*/
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public abstract class InputEvent extends ComponentEvent
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{
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/**
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* Compatible with JDK 1.1+.
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*/
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private static final long serialVersionUID = -2482525981698309786L;
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/**
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* This is the bit mask which indicates the shift key is down. It is
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* recommended that SHIFT_DOWN_MASK be used instead.
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*
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* @see #SHIFT_DOWN_MASK
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*/
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public static final int SHIFT_MASK = 1;
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/**
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* This is the bit mask which indicates the control key is down. It is
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* recommended that CTRL_DOWN_MASK be used instead.
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*
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* @see #CTRL_DOWN_MASK
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*/
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public static final int CTRL_MASK = 2;
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/**
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* This is the bit mask which indicates the meta key is down. It is
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* recommended that META_DOWN_MASK be used instead.
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*
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* @see #META_DOWN_MASK
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*/
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public static final int META_MASK = 4;
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/**
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* This is the bit mask which indicates the alt key is down. It is
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* recommended that ALT_DOWN_MASK be used instead.
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*
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* @see #ALT_DOWN_MASK
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*/
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public static final int ALT_MASK = 8;
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/**
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* This is the bit mask which indicates the alt-graph modifier is in effect.
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* It is recommended that ALT_GRAPH_DOWN_MASK be used instead.
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*
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* @see #ALT_GRAPH_DOWN_MASK
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*/
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public static final int ALT_GRAPH_MASK = 0x20;
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/**
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* This bit mask indicates mouse button one is down. It is recommended that
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* BUTTON1_DOWN_MASK be used instead.
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*
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* @see #BUTTON1_DOWN_MASK
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*/
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public static final int BUTTON1_MASK = 0x10;
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/**
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* This bit mask indicates mouse button two is down. It is recommended that
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* BUTTON2_DOWN_MASK be used instead.
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*
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* @see #BUTTON2_DOWN_MASK
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*/
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public static final int BUTTON2_MASK = 8;
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/**
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* This bit mask indicates mouse button three is down. It is recommended
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* that BUTTON3_DOWN_MASK be used instead.
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*
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* @see #BUTTON3_DOWN_MASK
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*/
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public static final int BUTTON3_MASK = 4;
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/**
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* The SHIFT key extended modifier.
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*
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* @since 1.4
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*/
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public static final int SHIFT_DOWN_MASK = 0x0040;
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/**
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* The CTRL key extended modifier.
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*
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* @since 1.4
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*/
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public static final int CTRL_DOWN_MASK = 0x0080;
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/**
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* The META key extended modifier.
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*
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* @since 1.4
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*/
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public static final int META_DOWN_MASK = 0x0100;
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/**
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* The ALT key extended modifier.
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*
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* @since 1.4
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*/
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public static final int ALT_DOWN_MASK = 0x0200;
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/**
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* The mouse button1 key extended modifier.
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*
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* @since 1.4
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*/
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public static final int BUTTON1_DOWN_MASK = 0x0400;
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/**
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* The mouse button2 extended modifier.
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*
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* @since 1.4
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*/
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public static final int BUTTON2_DOWN_MASK = 0x0800;
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/**
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* The mouse button3 extended modifier.
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*
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* @since 1.4
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*/
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public static final int BUTTON3_DOWN_MASK = 0x1000;
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/**
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* The ALT_GRAPH key extended modifier.
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*
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* @since 1.4
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*/
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public static final int ALT_GRAPH_DOWN_MASK = 0x2000;
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/** The mask to convert new to old, package visible for use in subclasses. */
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static final int CONVERT_MASK
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= EventModifier.NEW_MASK & ~(BUTTON2_DOWN_MASK | BUTTON3_DOWN_MASK);
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/**
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* The timestamp when this event occurred.
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*
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* @see #getWhen()
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* @serial the timestamp
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*/
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private final long when;
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/**
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* The modifiers in effect for this event. Package visible for use by
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* subclasses. The old style (bitmask 0x3f) should not be mixed with the
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* new style (bitmasks 0xffffffc0).
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*
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* @see #getModifiers()
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* @see MouseEvent
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* @serial the modifier state, stored in the new style
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*/
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int modifiers;
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/**
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* Initializes a new instance of <code>InputEvent</code> with the specified
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* source, id, timestamp, and modifiers. Note that an invalid id leads to
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* unspecified results.
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*
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* @param source the source of the event
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* @param id the event id
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* @param when the timestamp when the event occurred
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* @param modifiers the modifiers in effect for this event, old or new style
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* @throws IllegalArgumentException if source is null
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*/
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InputEvent(Component source, int id, long when, int modifiers)
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{
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super(source, id);
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this.when = when;
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this.modifiers = EventModifier.extend(modifiers);
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}
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/**
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* This method tests whether or not the shift key was down during the event.
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*
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* @return true if the shift key is down
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*/
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public boolean isShiftDown()
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{
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return (modifiers & SHIFT_DOWN_MASK) != 0;
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}
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/**
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* This method tests whether or not the control key was down during the
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* event.
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*
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* @return true if the control key is down
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*/
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public boolean isControlDown()
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{
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return (modifiers & CTRL_DOWN_MASK) != 0;
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}
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/**
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* This method tests whether or not the meta key was down during the event.
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*
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* @return true if the meta key is down
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*/
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public boolean isMetaDown()
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{
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return (modifiers & META_DOWN_MASK) != 0;
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}
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/**
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* This method tests whether or not the alt key was down during the event.
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*
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* @return true if the alt key is down
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*/
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public boolean isAltDown()
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{
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return (modifiers & ALT_DOWN_MASK) != 0;
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}
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/**
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* This method tests whether or not the alt-graph modifier was in effect
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* during the event.
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*
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* @return true if the alt-graph modifier is down
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*/
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public boolean isAltGraphDown()
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{
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return (modifiers & ALT_GRAPH_DOWN_MASK) != 0;
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}
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/**
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* This method returns the timestamp when this event occurred.
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*
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* @return the timestamp when this event occurred
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*/
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public long getWhen()
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{
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return when;
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}
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/**
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* This method returns the old-style modifiers in effect for this event.
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* Note that this is ambiguous between button2 and alt, and between
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* button3 and meta. Also, code which generated these modifiers tends to
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* only list the modifier that just changed, even if others were down at
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* the time. Consider using getModifiersEx instead. This will be a union
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* of the bit masks defined in this class that are applicable to the event.
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*
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* @return the modifiers in effect for this event
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* @see #getModifiersEx()
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*/
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public int getModifiers()
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{
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return EventModifier.revert(modifiers);
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}
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/**
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* Returns the extended modifiers (new-style) for this event. This represents
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* the state of all modal keys and mouse buttons at the time of the event,
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* and does not suffer from the problems mentioned in getModifiers.
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*
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* <p>For an example of checking multiple modifiers, this code will return
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* true only if SHIFT and BUTTON1 were pressed and CTRL was not:
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* <pre>
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* int onmask = InputEvent.SHIFT_DOWN_MASK | InputEvent.BUTTON1_DOWN_MASK;
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* int offmask = InputEvent.CTRL_DOWN_MASK;
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* return (event.getModifiersEx() & (onmask | offmask)) == onmask;
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* </pre>
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*
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* @return the bitwise or of all modifiers pressed during the event
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* @since 1.4
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*/
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public int getModifiersEx()
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{
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return modifiers;
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}
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/**
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* Consumes this event. A consumed event is not processed further by the AWT
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* system.
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*/
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public void consume()
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{
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consumed = true;
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}
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/**
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* This method tests whether or not this event has been consumed.
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*
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* @return true if this event has been consumed
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*/
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public boolean isConsumed()
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{
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return consumed;
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}
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/**
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* Convert the extended modifier bitmask into a String, such as "Shift" or
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* "Ctrl+Button1".
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*
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* XXX Sun claims this can be localized via the awt.properties file - how
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* do we implement that?
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*
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* @return a string representation of the modifiers in this bitmask
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* @since 1.4
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*/
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public static String getModifiersExText(int modifiers)
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{
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modifiers &= EventModifier.NEW_MASK;
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if (modifiers == 0)
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return "";
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StringBuffer s = new StringBuffer();
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if ((modifiers & META_DOWN_MASK) != 0)
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s.append("Meta+");
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if ((modifiers & CTRL_DOWN_MASK) != 0)
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s.append("Ctrl+");
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if ((modifiers & ALT_DOWN_MASK) != 0)
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s.append("Alt+");
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if ((modifiers & SHIFT_DOWN_MASK) != 0)
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s.append("Shift+");
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if ((modifiers & ALT_GRAPH_DOWN_MASK) != 0)
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s.append("Alt Graph+");
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if ((modifiers & BUTTON1_DOWN_MASK) != 0)
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s.append("Button1+");
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if ((modifiers & BUTTON2_DOWN_MASK) != 0)
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s.append("Button2+");
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if ((modifiers & BUTTON3_DOWN_MASK) != 0)
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s.append("Button3+");
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return s.substring(0, s.length() - 1);
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}
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} // class InputEvent
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