JDK14/Java14源码在线阅读
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package java.awt.event;
import java.awt.Event;
import java.awt.Component;
import java.awt.GraphicsEnvironment;
import java.awt.Toolkit;
import java.util.Arrays;
import sun.awt.AWTAccessor;
import sun.awt.AWTPermissions;
import sun.util.logging.PlatformLogger;
/**
* 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
*
* @see KeyEvent
* @see KeyAdapter
* @see MouseEvent
* @see MouseAdapter
* @see MouseMotionAdapter
*
* @since 1.1
*/
public abstract class InputEvent extends ComponentEvent {
private static final PlatformLogger logger = PlatformLogger.getLogger("java.awt.event.InputEvent");
/**
* The Shift key modifier constant.
*
* @deprecated It is recommended that SHIFT_DOWN_MASK and
* {@link #getModifiersEx()} be used instead
*/
@Deprecated(since = "9")
public static final int SHIFT_MASK = Event.SHIFT_MASK;
/**
* The Control key modifier constant.
*
* @deprecated It is recommended that CTRL_DOWN_MASK and
* {@link #getModifiersEx()} be used instead
*/
@Deprecated(since = "9")
public static final int CTRL_MASK = Event.CTRL_MASK;
/**
* The Meta key modifier constant.
*
* @deprecated It is recommended that META_DOWN_MASK and
* {@link #getModifiersEx()} be used instead
*/
@Deprecated(since = "9")
public static final int META_MASK = Event.META_MASK;
/**
* The Alt key modifier constant.
*
* @deprecated It is recommended that ALT_DOWN_MASK and
* {@link #getModifiersEx()} be used instead
*/
@Deprecated(since = "9")
public static final int ALT_MASK = Event.ALT_MASK;
/**
* The AltGraph key modifier constant.
*
* @deprecated It is recommended that ALT_GRAPH_DOWN_MASK and
* {@link #getModifiersEx()} be used instead
*/
@Deprecated(since = "9")
public static final int ALT_GRAPH_MASK = 1 << 5;
/**
* The Mouse Button1 modifier constant.
*
* @deprecated It is recommended that BUTTON1_DOWN_MASK and
* {@link #getModifiersEx()} be used instead
*/
@Deprecated(since = "9")
public static final int BUTTON1_MASK = 1 << 4;
/**
* The Mouse Button2 modifier constant.
*
* @deprecated It is recommended that BUTTON2_DOWN_MASK and
* {@link #getModifiersEx()} be used instead. Note that
* BUTTON2_MASK has the same value as ALT_MASK.
*/
@Deprecated(since = "9")
public static final int BUTTON2_MASK = Event.ALT_MASK;
/**
* The Mouse Button3 modifier constant.
*
* @deprecated It is recommended that BUTTON3_DOWN_MASK and
* {@link #getModifiersEx()} be used instead. Note that
* BUTTON3_MASK has the same value as META_MASK.
*/
@Deprecated(since = "9")
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;
/**
* An array of extended modifiers for additional buttons.
* @see #getButtonDownMasks()
* There are twenty buttons fit into 4byte space.
* one more bit is reserved for FIRST_HIGH_BIT.
* @since 1.7
*/
private static final int [] BUTTON_DOWN_MASK = new int [] { BUTTON1_DOWN_MASK,
BUTTON2_DOWN_MASK,
BUTTON3_DOWN_MASK,
1<<14, //4th physical button (this is not a wheel!)
1<<15, //(this is not a wheel!)
1<<16,
1<<17,
1<<18,
1<<19,
1<<20,
1<<21,
1<<22,
1<<23,
1<<24,
1<<25,
1<<26,
1<<27,
1<<28,
1<<29,
1<<30};
/**
* A method to access an array of extended modifiers for additional buttons.
* @since 1.7
*/
private static int [] getButtonDownMasks(){
return Arrays.copyOf(BUTTON_DOWN_MASK, BUTTON_DOWN_MASK.length);
}
/**
* A method to obtain a mask for any existing mouse button.
* The returned mask may be used for different purposes. Following are some of them:
* <ul>
* <li> {@link java.awt.Robot#mousePress(int) mousePress(buttons)} and
* {@link java.awt.Robot#mouseRelease(int) mouseRelease(buttons)}
* <li> as a {@code modifiers} parameter when creating a new {@link MouseEvent} instance
* <li> to check {@link MouseEvent#getModifiersEx() modifiersEx} of existing {@code MouseEvent}
* </ul>
* @param button is a number to represent a button starting from 1.
* For example,
* <pre>
* int button = InputEvent.getMaskForButton(1);
* </pre>
* will have the same meaning as
* <pre>
* int button = InputEvent.getMaskForButton(MouseEvent.BUTTON1);
* </pre>
* because {@link MouseEvent#BUTTON1 MouseEvent.BUTTON1} equals to 1.
* If a mouse has three enabled buttons(see {@link java.awt.MouseInfo#getNumberOfButtons() MouseInfo.getNumberOfButtons()})
* then the values from the left column passed into the method will return
* corresponding values from the right column:
* <PRE>
* <b>button </b> <b>returned mask</b>
* {@link MouseEvent#BUTTON1 BUTTON1} {@link MouseEvent#BUTTON1_DOWN_MASK BUTTON1_DOWN_MASK}
* {@link MouseEvent#BUTTON2 BUTTON2} {@link MouseEvent#BUTTON2_DOWN_MASK BUTTON2_DOWN_MASK}
* {@link MouseEvent#BUTTON3 BUTTON3} {@link MouseEvent#BUTTON3_DOWN_MASK BUTTON3_DOWN_MASK}
* </PRE>
* If a mouse has more than three enabled buttons then more values
* are admissible (4, 5, etc.). There is no assigned constants for these extended buttons.
* The button masks for the extra buttons returned by this method have no assigned names like the
* first three button masks.
* <p>
* This method has the following implementation restriction.
* It returns masks for a limited number of buttons only. The maximum number is
* implementation dependent and may vary.
* This limit is defined by the relevant number
* of buttons that may hypothetically exist on the mouse but it is greater than the
* {@link java.awt.MouseInfo#getNumberOfButtons() MouseInfo.getNumberOfButtons()}.
*
* @return a mask for an existing mouse button.
* @throws IllegalArgumentException if {@code button} is less than zero or greater than the number
* of button masks reserved for buttons
* @since 1.7
* @see java.awt.MouseInfo#getNumberOfButtons()
* @see Toolkit#areExtraMouseButtonsEnabled()
* @see MouseEvent#getModifiers()
* @see MouseEvent#getModifiersEx()
*/
public static int getMaskForButton(int button) {
if (button <= 0 || button > BUTTON_DOWN_MASK.length) {
throw new IllegalArgumentException("button doesn't exist " + button);
}
return BUTTON_DOWN_MASK[button - 1];
}
// 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 << 31;
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();
}
AWTAccessor.setInputEventAccessor(
new AWTAccessor.InputEventAccessor() {
public int[] getButtonDownMasks() {
return InputEvent.getButtonDownMasks();
}
public boolean canAccessSystemClipboard(InputEvent event) {
return event.canAccessSystemClipboard;
}
@Override
public void setCanAccessSystemClipboard(InputEvent event,
boolean canAccessSystemClipboard) {
event.canAccessSystemClipboard = canAccessSystemClipboard;
}
});
}
/**
* 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> This method throws an
* {@code IllegalArgumentException} if {@code source}
* is {@code null}.
*
* @param source the object where the event originated
* @param id the integer that identifies the event type.
* It is allowed to pass as parameter any value that
* allowed for some subclass of {@code InputEvent} class.
* Passing in the value different from those values result
* in unspecified behavior
* @param when a long int that gives the time the event occurred.
* Passing negative or zero value
* is not recommended
* @param modifiers a modifier mask describing the modifier keys and mouse
* buttons (for example, shift, ctrl, alt, and meta) that
* are down during the event.
* Only extended modifiers are allowed to be used as a
* value for this parameter (see the {@link InputEvent#getModifiersEx}
* class for the description of extended modifiers).
* Passing negative parameter
* is not recommended.
* Zero value means that no modifiers were passed
* @throws IllegalArgumentException if {@code source} is null
* @see #getSource()
* @see #getID()
* @see #getWhen()
* @see #getModifiers()
*/
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.checkPermission(AWTPermissions.ACCESS_CLIPBOARD_PERMISSION);
b = true;
} catch (SecurityException se) {
if (logger.isLoggable(PlatformLogger.Level.FINE)) {
logger.fine("InputEvent.canAccessSystemClipboard() got SecurityException ", se);
}
}
} else {
b = true;
}
}
return b;
}
/**
* Returns whether or not the Shift modifier is down on this event.
* @return whether or not the Shift modifier is down on this event
*/
public boolean isShiftDown() {
return (modifiers & SHIFT_DOWN_MASK) != 0;
}
/**
* Returns whether or not the Control modifier is down on this event.
* @return whether or not the Control modifier is down on this event
*/
public boolean isControlDown() {
return (modifiers & CTRL_DOWN_MASK) != 0;
}
/**
* Returns whether or not the Meta modifier is down on this event.
* @return whether or not the Meta modifier is down on this event
*/
public boolean isMetaDown() {
return (modifiers & META_DOWN_MASK) != 0;
}
/**
* Returns whether or not the Alt modifier is down on this event.
* @return whether or not the Alt modifier is down on this event
*/
public boolean isAltDown() {
return (modifiers & ALT_DOWN_MASK) != 0;
}
/**
* Returns whether or not the AltGraph modifier is down on this event.
* @return whether or not the AltGraph modifier is down on this event
*/
public boolean isAltGraphDown() {
return (modifiers & ALT_GRAPH_DOWN_MASK) != 0;
}
/**
* Returns the difference in milliseconds between the timestamp of when this event occurred and
* midnight, January 1, 1970 UTC.
* @return the difference in milliseconds between the timestamp and midnight, January 1, 1970 UTC
*/
public long getWhen() {
return when;
}
/**
* Returns the modifier mask for this event.
*
* @return the modifier mask for this event
* @deprecated It is recommended that extended modifier keys and
* {@link #getModifiersEx()} be used instead
*/
@Deprecated(since = "9")
public int getModifiers() {
return modifiers & (JDK_1_3_MODIFIERS | HIGH_MODIFIERS);
}
/**
* Returns the extended modifier mask for this event.
* <P>
* Extended modifiers are the modifiers that ends with the _DOWN_MASK suffix,
* such as ALT_DOWN_MASK, BUTTON1_DOWN_MASK, and others.
* <P>
* 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 BUTTON1_DOWN_MASK}
* {@code MOUSE_PRESSED}: {@code BUTTON1_DOWN_MASK | BUTTON2_DOWN_MASK}
* {@code MOUSE_RELEASED}: {@code BUTTON2_DOWN_MASK}
* {@code MOUSE_CLICKED}: {@code BUTTON2_DOWN_MASK}
* {@code MOUSE_RELEASED}:
* {@code MOUSE_CLICKED}:
* </PRE>
* <P>
* It is not recommended to compare the return value of this method
* using {@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.
*
* @return the extended modifier mask for this event
* @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.
* @return 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;
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