[Chapter 18] 18.20 java.awt.Event (JDK 1.0)
Author: David Flanagan
Date: Thu Jul 31 16:09:54 1997

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| Chapter 18 The java.awt Package |

## 18.20 java.awt.Event (JDK 1.0)

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This class contains public instance variables that describe some kind of GUI event. In Java 1.1, this class has been superseded by `AWTEvent` and the `java.awt.event` package.

The class contains a large number of constants. Some of the constants specify the event type and are values for the `id` variable. Other constants are values for keys, like the function keys, that do not have ASCII (or Latin-1) values, and are set on the `key` field. Other constants are mask values that are ORed into the `modifiers` field to describe the state of the modifier keys on the keyboard. The `target` field is very important--it is the object for which the event occurred. The `when` field specifies when the event occurred. The `x` and `y` fields specify the mouse coordinates at which it occurred. Finally, the `arg` field is a value specific to the type of the event. Not all fields have valid values for all types of events.

    public class Event extends Object implements Serializable {
        // Public Constructors
                public Event(Object target, long when, int id, int x, int y, int key, int modifiers, Object arg);
                public Event(Object target, long when, int id, int x, int y, int key, int modifiers);
                public Event(Object target, int id, Object arg);
        // Event Type Constants
                public static final int ACTION_EVENT;
                public static final int GOT_FOCUS, LOST_FOCUS;
                public static final int KEY_ACTION, KEY_ACTION_RELEASE;
                public static final int KEY_PRESS, KEY_RELEASE;
                public static final int LIST_SELECT, LIST_DESELECT;
                public static final int LOAD_FILE, SAVE_FILE;
                public static final int MOUSE_DOWN, MOUSE_UP;
                public static final int MOUSE_DRAG, MOUSE_MOVE;
                public static final int MOUSE_ENTER, MOUSE_EXIT;
                public static final int SCROLL_ABSOLUTE;
            1.1  public static final int SCROLL_BEGIN, SCROLL_END;
                public static final int SCROLL_LINE_DOWN, SCROLL_LINE_UP;
                public static final int SCROLL_PAGE_DOWN, SCROLL_PAGE_UP;
                public static final int WINDOW_EXPOSE;
                public static final int WINDOW_ICONIFY, WINDOW_DEICONIFY;
                public static final int WINDOW_DESTROY;
                public static final int WINDOW_MOVED;
        // Keyboard Modifier Constants
                public static final int ALT_MASK;
                public static final int CTRL_MASK;
                public static final int META_MASK;
                public static final int SHIFT_MASK;
        // Function Key Constants
                public static final int F1, F2, F3, F4, F5, F6, F7, F8, F9, F10, F11, F12;
                public static final int LEFT, RIGHT, UP, DOWN;
                public static final int PGUP, PGDN;
                public static final int HOME, END;
            1.1  public static final int INSERT, DELETE;
            1.1  public static final int BACK_SPACE;
            1.1  public static final int ENTER;
            1.1  public static final int ESCAPE;
            1.1  public static final int TAB;
            1.1  public static final int CAPS_LOCK, NUM_LOCK, SCROLL_LOCK;
            1.1  public static final int PAUSE, PRINT_SCREEN;
        // Public Instance Variables
                public Object arg;
                public int clickCount;
                public Event evt;
                public int id;
                public int key;
                public int modifiers;
                public Object target;
                public long when;
                public int x;
                public int y;
        // Public Instance Methods
                public boolean controlDown();
                public boolean metaDown();
                public boolean shiftDown();
                public String toString();  // Overrides Object
                public void translate(int x, int y);
        // Protected Instance Methods
                protected String paramString();
    }

### Passed To:

`AWTEvent(), Component.action(), Component.deliverEvent(), Component.gotFocus(), Component.handleEvent(), Component.keyDown(), Component.keyUp(), Component.lostFocus(), Component.mouseDown(), Component.mouseDrag(), Component.mouseEnter(), Component.mouseExit(), Component.mouseMove(), Component.mouseUp(), Component.postEvent(), Container.deliverEvent(), MenuComponent.postEvent(), MenuContainer.postEvent(), PopupMenuPeer.show(), Window.postEvent()`

### Type Of:

`Event.evt`

java.awt.Dimension (JDK 1.0) |  | java.awt.EventQueue (JDK 1.1)