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/* * @(#)InputEvent.java 1.37 06/03/17 * * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. */ package java.awt.event; import java.awt.Event; import java.awt.Component; import java.awt.GraphicsEnvironment; import java.awt.Toolkit; /** * The root event class for all component-level input events. * * Input events are delivered to listeners before they are * processed normally by the source where they originated. * This allows listeners and component subclasses to "consume" * the event so that the source will not process them in their * default manner. For example, consuming mousePressed events * on a Button component will prevent the Button from being * activated. * * @author Carl Quinn * @version 1.37 03/17/06 * * @see KeyEvent * @see KeyAdapter * @see MouseEvent * @see MouseAdapter * @see MouseMotionAdapter * * @since 1.1 */ public abstract class InputEvent extends ComponentEvent { /** * The Shift key modifier constant. * It is recommended that SHIFT_DOWN_MASK be used instead. */ public static final int SHIFT_MASK = Event.SHIFT_MASK; /** * The Control key modifier constant. * It is recommended that CTRL_DOWN_MASK be used instead. */ public static final int CTRL_MASK = Event.CTRL_MASK; /** * The Meta key modifier constant. * It is recommended that META_DOWN_MASK be used instead. */ public static final int META_MASK = Event.META_MASK; /** * The Alt key modifier constant. * It is recommended that ALT_DOWN_MASK be used instead. */ public static final int ALT_MASK = Event.ALT_MASK; /** * The AltGraph key modifier constant. */ public static final int ALT_GRAPH_MASK = 1 << 5; /** * The Mouse Button1 modifier constant. * It is recommended that BUTTON1_DOWN_MASK be used instead. */ public static final int BUTTON1_MASK = 1 << 4; /** * The Mouse Button2 modifier constant. * It is recommended that BUTTON2_DOWN_MASK be used instead. * Note that BUTTON2_MASK has the same value as ALT_MASK. */ public static final int BUTTON2_MASK = Event.ALT_MASK; /** * The Mouse Button3 modifier constant. * It is recommended that BUTTON3_DOWN_MASK be used instead. * Note that BUTTON3_MASK has the same value as META_MASK. */ public static final int BUTTON3_MASK = Event.META_MASK; /** * The Shift key extended modifier constant. * @since 1.4 */ public static final int SHIFT_DOWN_MASK = 1 << 6; /** * The Control key extended modifier constant. * @since 1.4 */ public static final int CTRL_DOWN_MASK = 1 << 7; /** * The Meta key extended modifier constant. * @since 1.4 */ public static final int META_DOWN_MASK = 1 << 8; /** * The Alt key extended modifier constant. * @since 1.4 */ public static final int ALT_DOWN_MASK = 1 << 9; /** * The Mouse Button1 extended modifier constant. * @since 1.4 */ public static final int BUTTON1_DOWN_MASK = 1 << 10; /** * The Mouse Button2 extended modifier constant. * @since 1.4 */ public static final int BUTTON2_DOWN_MASK = 1 << 11; /** * The Mouse Button3 extended modifier constant. * @since 1.4 */ public static final int BUTTON3_DOWN_MASK = 1 << 12; /** * The AltGraph key extended modifier constant. * @since 1.4 */ public static final int ALT_GRAPH_DOWN_MASK = 1 << 13; // the constant below MUST be updated if any extra modifier // bits are to be added! // in fact, it is undesirable to add modifier bits // to the same field as this may break applications // see bug# 5066958 static final int FIRST_HIGH_BIT = 1 << 14; static final int JDK_1_3_MODIFIERS = SHIFT_DOWN_MASK - 1; static final int HIGH_MODIFIERS = ~( FIRST_HIGH_BIT - 1 ); /** * The input event's Time stamp in UTC format. The time stamp * indicates when the input event was created. * * @serial * @see #getWhen() */ long when; /** * The state of the modifier mask at the time the input * event was fired. * * @serial * @see #getModifiers() * @see #getModifiersEx() * @see java.awt.event.KeyEvent * @see java.awt.event.MouseEvent */ int modifiers; /* * A flag that indicates that this instance can be used to access * the system clipboard. */ private transient boolean canAccessSystemClipboard; static { /* ensure that the necessary native libraries are loaded */ NativeLibLoader.loadLibraries(); if (!GraphicsEnvironment.isHeadless()) { initIDs(); } } /** * Initialize JNI field and method IDs for fields that may be accessed from C. */ private static native void initIDs(); /** * Constructs an InputEvent object with the specified source component, * modifiers, and type. * <p>Note that passing in an invalid <code>id</code> results in * unspecified behavior. This method throws an * <code>IllegalArgumentException</code> if <code>source</code> * is <code>null</code>. * * @param source the object where the event originated * @param id the event type * @param when the time the event occurred * @param modifiers represents the modifier keys and mouse buttons down * while the event occurred * @throws IllegalArgumentException if <code>source</code> is null */ InputEvent(Component source, int id, long when, int modifiers) { super(source, id); this.when = when; this.modifiers = modifiers; canAccessSystemClipboard = canAccessSystemClipboard(); } private boolean canAccessSystemClipboard() { boolean b = false; if (!GraphicsEnvironment.isHeadless()) { SecurityManager sm = System.getSecurityManager(); if (sm != null) { try { sm.checkSystemClipboardAccess(); b = true; } catch (SecurityException se) { } } else { b = true; } } return b; } /** * Returns whether or not the Shift modifier is down on this event. */ public boolean isShiftDown() { return (modifiers & SHIFT_MASK) != 0; } /** * Returns whether or not the Control modifier is down on this event. */ public boolean isControlDown() { return (modifiers & CTRL_MASK) != 0; } /** * Returns whether or not the Meta modifier is down on this event. */ public boolean isMetaDown() { return (modifiers & META_MASK) != 0; } /** * Returns whether or not the Alt modifier is down on this event. */ public boolean isAltDown() { return (modifiers & ALT_MASK) != 0; } /** * Returns whether or not the AltGraph modifier is down on this event. */ public boolean isAltGraphDown() { return (modifiers & ALT_GRAPH_MASK) != 0; } /** * Returns the timestamp of when this event occurred. */ public long getWhen() { return when; } /** * Returns the modifier mask for this event. */ public int getModifiers() { return modifiers & (JDK_1_3_MODIFIERS | HIGH_MODIFIERS); } /** * Returns the extended modifier mask for this event. * Extended modifiers represent the state of all modal keys, * such as ALT, CTRL, META, and the mouse buttons just after * the event occurred * <P> * For example, if the user presses <b>button 1</b> followed by * <b>button 2</b>, and then releases them in the same order, * the following sequence of events is generated: * <PRE> * <code>MOUSE_PRESSED</code>: <code>BUTTON1_DOWN_MASK</code> * <code>MOUSE_PRESSED</code>: <code>BUTTON1_DOWN_MASK | BUTTON2_DOWN_MASK</code> * <code>MOUSE_RELEASED</code>: <code>BUTTON2_DOWN_MASK</code> * <code>MOUSE_CLICKED</code>: <code>BUTTON2_DOWN_MASK</code> * <code>MOUSE_RELEASED</code>: * <code>MOUSE_CLICKED</code>: * </PRE> * <P> * It is not recommended to compare the return value of this method * using <code>==</code> because new modifiers can be added in the future. * For example, the appropriate way to check that SHIFT and BUTTON1 are * down, but CTRL is up is demonstrated by the following code: * <PRE> * int onmask = SHIFT_DOWN_MASK | BUTTON1_DOWN_MASK; * int offmask = CTRL_DOWN_MASK; * if ((event.getModifiersEx() & (onmask | offmask)) == onmask) { * ... * } * </PRE> * The above code will work even if new modifiers are added. * * @since 1.4 */ public int getModifiersEx() { return modifiers & ~JDK_1_3_MODIFIERS; } /** * Consumes this event so that it will not be processed * in the default manner by the source which originated it. */ public void consume() { consumed = true; } /** * Returns whether or not this event has been consumed. * @see #consume */ public boolean isConsumed() { return consumed; } // state serialization compatibility with JDK 1.1 static final long serialVersionUID = -2482525981698309786L; /** * Returns a String describing the extended modifier keys and * mouse buttons, such as "Shift", "Button1", or "Ctrl+Shift". * These strings can be localized by changing the * awt.properties file. * * @param modifiers a modifier mask describing the extended * modifier keys and mouse buttons for the event * @return a text description of the combination of extended * modifier keys and mouse buttons that were held down * during the event. * @since 1.4 */ public static String getModifiersExText(int modifiers) { StringBuffer buf = new StringBuffer(); if ((modifiers & InputEvent.META_DOWN_MASK) != 0) { buf.append(Toolkit.getProperty("AWT.meta", "Meta")); buf.append("+"); } if ((modifiers & InputEvent.CTRL_DOWN_MASK) != 0) { buf.append(Toolkit.getProperty("AWT.control", "Ctrl")); buf.append("+"); } if ((modifiers & InputEvent.ALT_DOWN_MASK) != 0) { buf.append(Toolkit.getProperty("AWT.alt", "Alt")); buf.append("+"); } if ((modifiers & InputEvent.SHIFT_DOWN_MASK) != 0) { buf.append(Toolkit.getProperty("AWT.shift", "Shift")); buf.append("+"); } if ((modifiers & InputEvent.ALT_GRAPH_DOWN_MASK) != 0) { buf.append(Toolkit.getProperty("AWT.altGraph", "Alt Graph")); buf.append("+"); } if ((modifiers & InputEvent.BUTTON1_DOWN_MASK) != 0) { buf.append(Toolkit.getProperty("AWT.button1", "Button1")); buf.append("+"); } if ((modifiers & InputEvent.BUTTON2_DOWN_MASK) != 0) { buf.append(Toolkit.getProperty("AWT.button2", "Button2")); buf.append("+"); } if ((modifiers & InputEvent.BUTTON3_DOWN_MASK) != 0) { buf.append(Toolkit.getProperty("AWT.button3", "Button3")); buf.append("+"); } if (buf.length() > 0) { buf.setLength(buf.length()-1); // remove trailing '+' } return buf.toString(); } }