/*
* @(#)MouseEvent.java 1.49 03/12/19
*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package java.awt.event;
import java.awt.Component;
import java.awt.Event;
import java.awt.GraphicsEnvironment;
import java.awt.Point;
import java.awt.Toolkit;
import java.io.IOException;
import java.io.ObjectInputStream;
/**
* An event which indicates that a mouse action occurred in a component.
* A mouse action is considered to occur in a particular component if and only
* if the mouse cursor is over the unobscured part of the component's bounds
* when the action happens.
* Component bounds can be obscurred by the visible component's children or by a
* menu or by a top-level window.
* This event is used both for mouse events (click, enter, exit) and mouse
* motion events (moves and drags).
* <P>
* This low-level event is generated by a component object for:
* <ul>
* <li>Mouse Events
* <ul>
* <li>a mouse button is pressed
* <li>a mouse button is released
* <li>a mouse button is clicked (pressed and released)
* <li>the mouse cursor enters the unobscured part of component's geometry
* <li>the mouse cursor exits the unobscured part of component's geometry
* </ul>
* <li> Mouse Motion Events
* <ul>
* <li>the mouse is moved
* <li>the mouse is dragged
* </ul>
* </ul>
* <P>
* A <code>MouseEvent</code> object is passed to every
* <code>MouseListener</code>
* or <code>MouseAdapter</code> object which is registered to receive
* the "interesting" mouse events using the component's
* <code>addMouseListener</code> method.
* (<code>MouseAdapter</code> objects implement the
* <code>MouseListener</code> interface.) Each such listener object
* gets a <code>MouseEvent</code> containing the mouse event.
* <P>
* A <code>MouseEvent</code> object is also passed to every
* <code>MouseMotionListener</code> or
* <code>MouseMotionAdapter</code> object which is registered to receive
* mouse motion events using the component's
* <code>addMouseMotionListener</code>
* method. (<code>MouseMotionAdapter</code> objects implement the
* <code>MouseMotionListener</code> interface.) Each such listener object
* gets a <code>MouseEvent</code> containing the mouse motion event.
* <P>
* When a mouse button is clicked, events are generated and sent to the
* registered <code>MouseListener</code>s.
* The state of modal keys can be retrieved using {@link InputEvent#getModifiers}
* and {@link InputEvent#getModifiersEx}.
* The button mask returned by {@link InputEvent#getModifiers} reflects
* only the button that changed state, not the current state of all buttons.
* (Note: Due to overlap in the values of ALT_MASK/BUTTON2_MASK and
* META_MASK/BUTTON3_MASK, this is not always true for mouse events involving
* modifier keys).
* To get the state of all buttons and modifier keys, use
* {@link InputEvent#getModifiersEx}.
* The button which has changed state is returned by {@link MouseEvent#getButton}
* <P>
* For example, if the first mouse button is pressed, events are sent in the
* following order:
* <PRE>
* <b >id </b > <b >modifiers </b > <b >button </b >
* <code>MOUSE_PRESSED</code>: <code>BUTTON1_MASK</code> <code>BUTTON1</code>
* <code>MOUSE_RELEASED</code>: <code>BUTTON1_MASK</code> <code>BUTTON1</code>
* <code>MOUSE_CLICKED</code>: <code>BUTTON1_MASK</code> <code>BUTTON1</code>
* </PRE>
* When multiple mouse buttons are pressed, each press, release, and click
* results in a separate event.
* <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>
* <b >id </b > <b >modifiers </b > <b >button </b >
* <code>MOUSE_PRESSED</code>: <code>BUTTON1_MASK</code> <code>BUTTON1</code>
* <code>MOUSE_PRESSED</code>: <code>BUTTON2_MASK</code> <code>BUTTON2</code>
* <code>MOUSE_RELEASED</code>: <code>BUTTON1_MASK</code> <code>BUTTON1</code>
* <code>MOUSE_CLICKED</code>: <code>BUTTON1_MASK</code> <code>BUTTON1</code>
* <code>MOUSE_RELEASED</code>: <code>BUTTON2_MASK</code> <code>BUTTON2</code>
* <code>MOUSE_CLICKED</code>: <code>BUTTON2_MASK</code> <code>BUTTON2</code>
* </PRE>
* If <b>button 2</b> is released first, the
* <code>MOUSE_RELEASED</code>/<code>MOUSE_CLICKED</code> pair
* for <code>BUTTON2_MASK</code> arrives first,
* followed by the pair for <code>BUTTON1_MASK</code>.
* <p>
*
* <code>MOUSE_DRAGGED</code> events are delivered to the <code>Component</code>
* in which the mouse button was pressed until the mouse button is released
* (regardless of whether the mouse position is within the bounds of the
* <code>Component</code>). Due to platform-dependent Drag&Drop implementations,
* <code>MOUSE_DRAGGED</code> events may not be delivered during a native
* Drag&Drop operation.
*
* In a multi-screen environment mouse drag events are delivered to the
* <code>Component</code> even if the mouse position is outside the bounds of the
* <code>GraphicsConfiguration</code> associated with that
* <code>Component</code>. However, the reported position for mouse drag events
* in this case may differ from the actual mouse position:
* <ul>
* <li>In a multi-screen environment without a virtual device:
* <br>
* The reported coordinates for mouse drag events are clipped to fit within the
* bounds of the <code>GraphicsConfiguration</code> associated with
* the <code>Component</code>.
* <li>In a multi-screen environment with a virtual device:
* <br>
* The reported coordinates for mouse drag events are clipped to fit within the
* bounds of the virtual device associated with the <code>Component</code>.
* </ul>
*
* @author Carl Quinn
* 1.49, 12/19/03
*
* @see MouseAdapter
* @see MouseListener
* @see MouseMotionAdapter
* @see MouseMotionListener
* @see MouseWheelListener
* @see <a href="http://java.sun.com/docs/books/tutorial/post1.0/ui/mouselistener.html">Tutorial: Writing a Mouse Listener</a>
* @see <a href="http://java.sun.com/docs/books/tutorial/post1.0/ui/mousemotionlistener.html">Tutorial: Writing a Mouse Motion Listener</a>
* @see <a href="http://www.awl.com/cp/javaseries/jcl1_2.html">Reference: The Java Class Libraries (update file)</a>
*
* @since 1.1
*/
public class MouseEvent extends InputEvent {
/**
* The first number in the range of ids used for mouse events.
*/
public static final int MOUSE_FIRST = 500;
/**
* The last number in the range of ids used for mouse events.
*/
public static final int MOUSE_LAST = 507;
/**
* The "mouse clicked" event. This <code>MouseEvent</code>
* occurs when a mouse button is pressed and released.
*/
public static final int MOUSE_CLICKED = MOUSE_FIRST;
/**
* The "mouse pressed" event. This <code>MouseEvent</code>
* occurs when a mouse button is pushed down.
*/
public static final int MOUSE_PRESSED = 1 + MOUSE_FIRST; //Event.MOUSE_DOWN
/**
* The "mouse released" event. This <code>MouseEvent</code>
* occurs when a mouse button is let up.
*/
public static final int MOUSE_RELEASED = 2 + MOUSE_FIRST; //Event.MOUSE_UP
/**
* The "mouse moved" event. This <code>MouseEvent</code>
* occurs when the mouse position changes.
*/
public static final int MOUSE_MOVED = 3 + MOUSE_FIRST; //Event.MOUSE_MOVE
/**
* The "mouse entered" event. This <code>MouseEvent</code>
* occurs when the mouse cursor enters the unobscured part of component's
* geometry.
*/
public static final int MOUSE_ENTERED = 4 + MOUSE_FIRST; //Event.MOUSE_ENTER
/**
* The "mouse exited" event. This <code>MouseEvent</code>
* occurs when the mouse cursor exits the unobscured part of component's
* geometry.
*/
public static final int MOUSE_EXITED = 5 + MOUSE_FIRST; //Event.MOUSE_EXIT
/**
* The "mouse dragged" event. This <code>MouseEvent</code>
* occurs when the mouse position changes while a mouse button is pressed.
*/
public static final int MOUSE_DRAGGED = 6 + MOUSE_FIRST; //Event.MOUSE_DRAG
/**
* The "mouse wheel" event. This is the only <code>MouseWheelEvent</code>.
* It occurs when a mouse equipped with a wheel has its wheel rotated.
* @since 1.4
*/
public static final int MOUSE_WHEEL = 7 + MOUSE_FIRST;
/**
* Indicates no mouse buttons; used by {@link #getButton}.
* @since 1.4
*/
public static final int NOBUTTON = 0;
/**
* Indicates mouse button #1; used by {@link #getButton}.
* @since 1.4
*/
public static final int BUTTON1 = 1;
/**
* Indicates mouse button #2; used by {@link #getButton}.
* @since 1.4
*/
public static final int BUTTON2 = 2;
/**
* Indicates mouse button #3; used by {@link #getButton}.
* @since 1.4
*/
public static final int BUTTON3 = 3;
/**
* The mouse event's x coordinate.
* The x value is relative to the component that fired the event.
*
* @serial
* @see #getX()
*/
int x;
/**
* The mouse event's y coordinate.
* The y value is relative to the component that fired the event.
*
* @serial
* @see #getY()
*/
int y;
/**
* Indicates the number of quick consecutive clicks of
* a mouse button.
* clickCount will be valid for only three mouse events :<BR>
* <code>MOUSE_CLICKED</code>,
* <code>MOUSE_PRESSED</code> and
* <code>MOUSE_RELEASED</code>.
* For the above, the <code>clickCount</code> will be at least 1.
* For all other events the count will be 0.
*
* @serial
* @see #getClickCount().
*/
int clickCount;
/**
* Indicates which, if any, of the mouse buttons has changed state.
*
* The only legal values are the following constants:
* <code>NOBUTTON</code>,
* <code>BUTTON1</code>,
* <code>BUTTON2</code> or
* <code>BUTTON3</code>.
* @serial
* @see #getButton().
*/
int button;
/**
* A property used to indicate whether a Popup Menu
* should appear with a certain gestures.
* If <code>popupTrigger</code> = <code>false</code>,
* no popup menu should appear. If it is <code>true</code>
* then a popup menu should appear.
*
* @serial
* @see java.awt.PopupMenu
* @see #isPopupTrigger()
*/
boolean popupTrigger = false;
/*
* JDK 1.1 serialVersionUID
*/
private static final long serialVersionUID = -991214153494842848L;
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 a <code>MouseEvent</code> object with the
* specified source component,
* type, modifiers, coordinates, and click count.
* <p>
* Note that passing in an invalid <code>id</code> results in
* unspecified behavior. Creating an invalid event (such
* as by using more than one of the old _MASKs, or modifier/button
* values which don't match) results in unspecified behavior.
* This method throws an
* <code>IllegalArgumentException</code> if <code>source</code>
* is <code>null</code>.
*
* @param source the <code>Component</code> that originated the event
* @param id the integer that identifies the event
* @param when a long int that gives the time the event occurred
* @param modifiers the modifier keys down during event (e.g. shift, ctrl,
* alt, meta)
* Either extended _DOWN_MASK or old _MASK modifiers
* should be used, but both models should not be mixed
* in one event. Use of the extended modifiers is
* preferred.
* @param x the horizontal x coordinate for the mouse location
* @param y the vertical y coordinate for the mouse location
* @param clickCount the number of mouse clicks associated with event
* @param popupTrigger a boolean, true if this event is a trigger for a
* popup menu
* @param button which of the mouse buttons has changed state.
* <code>NOBUTTON</code>,
* <code>BUTTON1</code>,
* <code>BUTTON2</code> or
* <code>BUTTON3</code>.
* @throws IllegalArgumentException if an invalid <code>button</code>
* value is passed in
* @throws IllegalArgumentException if <code>source</code> is null
* @since 1.4
*/
public MouseEvent(Component source, int id, long when, int modifiers,
int x, int y, int clickCount, boolean popupTrigger,
int button)
{
super(source, id, when, modifiers);
this.x = x;
this.y = y;
this.clickCount = clickCount;
this.popupTrigger = popupTrigger;
if (button < NOBUTTON || button >BUTTON3) {
throw new IllegalArgumentException("Invalid button value");
}
this.button = button;
if ((getModifiers() != 0) && (getModifiersEx() == 0)) {
setNewModifiers();
} else if ((getModifiers() == 0) &&
(getModifiersEx() != 0 ||
button != NOBUTTON))
{
setOldModifiers();
}
}
/**
* Constructs a <code>MouseEvent</code> object with the
* specified source component,
* type, modifiers, coordinates, and click count.
* <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 <code>Component</code> that originated the event
* @param id the integer that identifies the event
* @param when a long int that gives the time the event occurred
* @param modifiers the modifier keys down during event (e.g. shift, ctrl,
* alt, meta)
* Either extended _DOWN_MASK or old _MASK modifiers
* should be used, but both models should not be mixed
* in one event. Use of the extended modifiers is
* preferred.
* @param x the horizontal x coordinate for the mouse location
* @param y the vertical y coordinate for the mouse location
* @param clickCount the number of mouse clicks associated with event
* @param popupTrigger a boolean, true if this event is a trigger for a
* popup menu
* @throws IllegalArgumentException if <code>source</code> is null
*/
public MouseEvent(Component source, int id, long when, int modifiers,
int x, int y, int clickCount, boolean popupTrigger) {
this(source, id, when, modifiers, x, y, clickCount, popupTrigger, NOBUTTON);
}
/**
* Returns the horizontal x position of the event relative to the
* source component.
*
* @return x an integer indicating horizontal position relative to
* the component
*/
public int getX() {
return x;
}
/**
* Returns the vertical y position of the event relative to the
* source component.
*
* @return y an integer indicating vertical position relative to
* the component
*/
public int getY() {
return y;
}
/**
* Returns the x,y position of the event relative to the source component.
*
* @return a <code>Point</code> object containing the x and y coordinates
* relative to the source component
*
*/
public Point getPoint() {
int x;
int y;
synchronized (this) {
x = this.x;
y = this.y;
}
return new Point(x, y);
}
/**
* Translates the event's coordinates to a new position
* by adding specified <code>x</code> (horizontal) and <code>y</code>
* (vertical) offsets.
*
* @param x the horizontal x value to add to the current x
* coordinate position
* @param y the vertical y value to add to the current y
coordinate position
*/
public synchronized void translatePoint(int x, int y) {
this.x += x;
this.y += y;
}
/**
* Returns the number of mouse clicks associated with this event.
*
* @return integer value for the number of clicks
*/
public int getClickCount() {
return clickCount;
}
/**
* Returns which, if any, of the mouse buttons has changed state.
*
* @return one of the following constants:
* <code>NOBUTTON</code>,
* <code>BUTTON1</code>,
* <code>BUTTON2</code> or
* <code>BUTTON3</code>.
* @since 1.4
*/
public int getButton() {
return button;
}
/**
* Returns whether or not this mouse event is the popup menu
* trigger event for the platform.
* <p><b>Note</b>: Popup menus are triggered differently
* on different systems. Therefore, <code>isPopupTrigger</code>
* should be checked in both <code>mousePressed</code>
* and <code>mouseReleased</code>
* for proper cross-platform functionality.
*
* @return boolean, true if this event is the popup menu trigger
* for this platform
*/
public boolean isPopupTrigger() {
return popupTrigger;
}
/**
* Returns a <code>String</code> describing the modifier keys and
* mouse buttons that were down during the event, such as "Shift",
* or "Ctrl+Shift". These strings can be localized by changing
* the <code>awt.properties</code> file.
* <p>
* Note that <code>InputEvent.ALT_MASK</code> and
* <code>InputEvent.BUTTON2_MASK</code> have the same value,
* so the string "Alt" is returned for both modifiers. Likewise,
* <code>InputEvent.META_MASK</code> and
* <code>InputEvent.BUTTON3_MASK</code> have the same value,
* so the string "Meta" is returned for both modifiers.
*
* @param modifiers a modifier mask describing the modifier keys and
* mouse buttons that were down during the event
* @return string a text description of the combination of modifier
* keys and mouse buttons that were down during the event
* @see InputEvent#getModifiersExText(int)
* @since 1.4
*/
public static String getMouseModifiersText(int modifiers) {
StringBuffer buf = new StringBuffer();
if ((modifiers & InputEvent.ALT_MASK) != 0) {
buf.append(Toolkit.getProperty("AWT.alt", "Alt"));
buf.append("+");
}
if ((modifiers & InputEvent.META_MASK) != 0) {
buf.append(Toolkit.getProperty("AWT.meta", "Meta"));
buf.append("+");
}
if ((modifiers & InputEvent.CTRL_MASK) != 0) {
buf.append(Toolkit.getProperty("AWT.control", "Ctrl"));
buf.append("+");
}
if ((modifiers & InputEvent.SHIFT_MASK) != 0) {
buf.append(Toolkit.getProperty("AWT.shift", "Shift"));
buf.append("+");
}
if ((modifiers & InputEvent.ALT_GRAPH_MASK) != 0) {
buf.append(Toolkit.getProperty("AWT.altGraph", "Alt Graph"));
buf.append("+");
}
if ((modifiers & InputEvent.BUTTON1_MASK) != 0) {
buf.append(Toolkit.getProperty("AWT.button1", "Button1"));
buf.append("+");
}
if ((modifiers & InputEvent.BUTTON2_MASK) != 0) {
buf.append(Toolkit.getProperty("AWT.button2", "Button2"));
buf.append("+");
}
if ((modifiers & InputEvent.BUTTON3_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();
}
/**
* Returns a parameter string identifying this event.
* This method is useful for event-logging and for debugging.
*
* @return a string identifying the event and its attributes
*/
public String paramString() {
StringBuffer str = new StringBuffer(80);
switch(id) {
case MOUSE_PRESSED:
str.append("MOUSE_PRESSED");
break;
case MOUSE_RELEASED:
str.append("MOUSE_RELEASED");
break;
case MOUSE_CLICKED:
str.append("MOUSE_CLICKED");
break;
case MOUSE_ENTERED:
str.append("MOUSE_ENTERED");
break;
case MOUSE_EXITED:
str.append("MOUSE_EXITED");
break;
case MOUSE_MOVED:
str.append("MOUSE_MOVED");
break;
case MOUSE_DRAGGED:
str.append("MOUSE_DRAGGED");
break;
case MOUSE_WHEEL:
str.append("MOUSE_WHEEL");
break;
default:
str.append("unknown type");
}
// (x,y) coordinates
str.append(",(").append(x).append(",").append(y).append(")");
str.append(",button=").append(getButton());
if (getModifiers() != 0) {
str.append(",modifiers=").append(getMouseModifiersText(modifiers));
}
if (getModifiersEx() != 0) {
str.append(",extModifiers=").append(getModifiersExText(modifiers));
}
str.append(",clickCount=").append(clickCount);
return str.toString();
}
/**
* Sets new modifiers by the old ones.
* Also sets button.
*/
private void setNewModifiers() {
if ((modifiers & BUTTON1_MASK) != 0) {
modifiers |= BUTTON1_DOWN_MASK;
}
if ((modifiers & BUTTON2_MASK) != 0) {
modifiers |= BUTTON2_DOWN_MASK;
}
if ((modifiers & BUTTON3_MASK) != 0) {
modifiers |= BUTTON3_DOWN_MASK;
}
if (id == MOUSE_PRESSED
|| id == MOUSE_RELEASED
|| id == MOUSE_CLICKED)
{
if ((modifiers & BUTTON1_MASK) != 0) {
button = BUTTON1;
modifiers &= ~BUTTON2_MASK & ~BUTTON3_MASK;
if (id != MOUSE_PRESSED) {
modifiers &= ~BUTTON1_DOWN_MASK;
}
} else if ((modifiers & BUTTON2_MASK) != 0) {
button = BUTTON2;
modifiers &= ~BUTTON1_MASK & ~BUTTON3_MASK;
if (id != MOUSE_PRESSED) {
modifiers &= ~BUTTON2_DOWN_MASK;
}
} else if ((modifiers & BUTTON3_MASK) != 0) {
button = BUTTON3;
modifiers &= ~BUTTON1_MASK & ~BUTTON2_MASK;
if (id != MOUSE_PRESSED) {
modifiers &= ~BUTTON3_DOWN_MASK;
}
}
}
if ((modifiers & InputEvent.ALT_MASK) != 0) {
modifiers |= InputEvent.ALT_DOWN_MASK;
}
if ((modifiers & InputEvent.META_MASK) != 0) {
modifiers |= InputEvent.META_DOWN_MASK;
}
if ((modifiers & InputEvent.SHIFT_MASK) != 0) {
modifiers |= InputEvent.SHIFT_DOWN_MASK;
}
if ((modifiers & InputEvent.CTRL_MASK) != 0) {
modifiers |= InputEvent.CTRL_DOWN_MASK;
}
if ((modifiers & InputEvent.ALT_GRAPH_MASK) != 0) {
modifiers |= InputEvent.ALT_GRAPH_DOWN_MASK;
}
}
/**
* Sets old modifiers by the new ones.
*/
private void setOldModifiers() {
if (id == MOUSE_PRESSED
|| id == MOUSE_RELEASED
|| id == MOUSE_CLICKED)
{
switch(button) {
case BUTTON1:
modifiers |= BUTTON1_MASK;
break;
case BUTTON2:
modifiers |= BUTTON2_MASK;
break;
case BUTTON3:
modifiers |= BUTTON3_MASK;
break;
}
} else {
if ((modifiers & BUTTON1_DOWN_MASK) != 0) {
modifiers |= BUTTON1_MASK;
}
if ((modifiers & BUTTON2_DOWN_MASK) != 0) {
modifiers |= BUTTON2_MASK;
}
if ((modifiers & BUTTON3_DOWN_MASK) != 0) {
modifiers |= BUTTON3_MASK;
}
}
if ((modifiers & ALT_DOWN_MASK) != 0) {
modifiers |= ALT_MASK;
}
if ((modifiers & META_DOWN_MASK) != 0) {
modifiers |= META_MASK;
}
if ((modifiers & SHIFT_DOWN_MASK) != 0) {
modifiers |= SHIFT_MASK;
}
if ((modifiers & CTRL_DOWN_MASK) != 0) {
modifiers |= CTRL_MASK;
}
if ((modifiers & ALT_GRAPH_DOWN_MASK) != 0) {
modifiers |= ALT_GRAPH_MASK;
}
}
/**
* Sets new modifiers by the old ones.
* @serial
*/
private void readObject(ObjectInputStream s)
throws IOException, ClassNotFoundException {
s.defaultReadObject();
if (getModifiers() != 0 && getModifiersEx() == 0) {
setNewModifiers();
}
}
}
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