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java.awt.event
Class InputEvent

java.lang.Object
  java.util.EventObject
      java.awt.AWTEvent
          java.awt.event.ComponentEvent
              java.awt.event.InputEvent

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

KeyEvent, MouseEvent

public abstract class InputEvent
extends ComponentEvent

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.

Since:

1.1

See Also:

KeyEvent, KeyAdapter, MouseEvent, MouseAdapter, MouseMotionAdapter, Serialized Form

Field Summary

Modifier and Type	Field and Description
static int	ALT_DOWN_MASK The Alt key extended modifier constant.
static int	ALT_GRAPH_DOWN_MASK The AltGraph key extended modifier constant.
static int	ALT_GRAPH_MASK The AltGraph key modifier constant.
static int	ALT_MASK The Alt key modifier constant.
static int	BUTTON1_DOWN_MASK The Mouse Button1 extended modifier constant.
static int	BUTTON1_MASK The Mouse Button1 modifier constant.
static int	BUTTON2_DOWN_MASK The Mouse Button2 extended modifier constant.
static int	BUTTON2_MASK The Mouse Button2 modifier constant.
static int	BUTTON3_DOWN_MASK The Mouse Button3 extended modifier constant.
static int	BUTTON3_MASK The Mouse Button3 modifier constant.
static int	CTRL_DOWN_MASK The Control key extended modifier constant.
static int	CTRL_MASK The Control key modifier constant.
static int	META_DOWN_MASK The Meta key extended modifier constant.
static int	META_MASK The Meta key modifier constant.
static int	SHIFT_DOWN_MASK The Shift key extended modifier constant.
static int	SHIFT_MASK The Shift key modifier constant.

Fields inherited from class java.awt.event.ComponentEvent

COMPONENT_FIRST, COMPONENT_HIDDEN, COMPONENT_LAST, COMPONENT_MOVED, COMPONENT_RESIZED, COMPONENT_SHOWN

Fields inherited from class java.awt.AWTEvent

ACTION_EVENT_MASK, ADJUSTMENT_EVENT_MASK, COMPONENT_EVENT_MASK, consumed, CONTAINER_EVENT_MASK, FOCUS_EVENT_MASK, HIERARCHY_BOUNDS_EVENT_MASK, HIERARCHY_EVENT_MASK, id, INPUT_METHOD_EVENT_MASK, INVOCATION_EVENT_MASK, ITEM_EVENT_MASK, KEY_EVENT_MASK, MOUSE_EVENT_MASK, MOUSE_MOTION_EVENT_MASK, MOUSE_WHEEL_EVENT_MASK, PAINT_EVENT_MASK, RESERVED_ID_MAX, TEXT_EVENT_MASK, WINDOW_EVENT_MASK, WINDOW_FOCUS_EVENT_MASK, WINDOW_STATE_EVENT_MASK

Fields inherited from class java.util.EventObject

source

Method Summary

Modifier and Type	Method and Description
void	consume() Consumes this event so that it will not be processed in the default manner by the source which originated it.
static int	getMaskForButton(int button) A method to obtain a mask for any existing mouse button.
int	getModifiers() Returns the modifier mask for this event.
int	getModifiersEx() Returns the extended modifier mask for this event.
static String	getModifiersExText(int modifiers) Returns a String describing the extended modifier keys and mouse buttons, such as "Shift", "Button1", or "Ctrl+Shift".
long	getWhen() Returns the difference in milliseconds between the timestamp of when this event occurred and midnight, January 1, 1970 UTC.
boolean	isAltDown() Returns whether or not the Alt modifier is down on this event.
boolean	isAltGraphDown() Returns whether or not the AltGraph modifier is down on this event.
boolean	isConsumed() Returns whether or not this event has been consumed.
boolean	isControlDown() Returns whether or not the Control modifier is down on this event.
boolean	isMetaDown() Returns whether or not the Meta modifier is down on this event.
boolean	isShiftDown() Returns whether or not the Shift modifier is down on this event.

Methods inherited from class java.awt.event.ComponentEvent

getComponent, paramString

Methods inherited from class java.awt.AWTEvent

getID, setSource, toString

Methods inherited from class java.util.EventObject

getSource

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

SHIFT_MASK

public static final int SHIFT_MASK

The Shift key modifier constant. It is recommended that SHIFT_DOWN_MASK be used instead.

See Also:

Constant Field Values

CTRL_MASK

public static final int CTRL_MASK

The Control key modifier constant. It is recommended that CTRL_DOWN_MASK be used instead.

See Also:

Constant Field Values

META_MASK

public static final int META_MASK

The Meta key modifier constant. It is recommended that META_DOWN_MASK be used instead.

See Also:

Constant Field Values

ALT_MASK

public static final int ALT_MASK

The Alt key modifier constant. It is recommended that ALT_DOWN_MASK be used instead.

See Also:

Constant Field Values

ALT_GRAPH_MASK

public static final int ALT_GRAPH_MASK

The AltGraph key modifier constant.

See Also:

Constant Field Values

BUTTON1_MASK

public static final int BUTTON1_MASK

The Mouse Button1 modifier constant. It is recommended that BUTTON1_DOWN_MASK be used instead.

See Also:

Constant Field Values

BUTTON2_MASK

public static final int BUTTON2_MASK

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.

See Also:

Constant Field Values

BUTTON3_MASK

public static final int BUTTON3_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.

See Also:

Constant Field Values

SHIFT_DOWN_MASK

public static final int SHIFT_DOWN_MASK

The Shift key extended modifier constant.

Since:

1.4

See Also:

Constant Field Values

CTRL_DOWN_MASK

public static final int CTRL_DOWN_MASK

The Control key extended modifier constant.

Since:

1.4

See Also:

Constant Field Values

META_DOWN_MASK

public static final int META_DOWN_MASK

The Meta key extended modifier constant.

Since:

1.4

See Also:

Constant Field Values

ALT_DOWN_MASK

public static final int ALT_DOWN_MASK

The Alt key extended modifier constant.

Since:

1.4

See Also:

Constant Field Values

BUTTON1_DOWN_MASK

public static final int BUTTON1_DOWN_MASK

The Mouse Button1 extended modifier constant.

Since:

1.4

See Also:

Constant Field Values

BUTTON2_DOWN_MASK

public static final int BUTTON2_DOWN_MASK

The Mouse Button2 extended modifier constant.

Since:

1.4

See Also:

Constant Field Values

BUTTON3_DOWN_MASK

public static final int BUTTON3_DOWN_MASK

The Mouse Button3 extended modifier constant.

Since:

1.4

See Also:

Constant Field Values

ALT_GRAPH_DOWN_MASK

public static final int ALT_GRAPH_DOWN_MASK

The AltGraph key extended modifier constant.

Since:

1.4

See Also:

Constant Field Values

Method Detail

getMaskForButton

public static int getMaskForButton(int button)

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:

• mousePress(buttons) and mouseRelease(buttons)
• as a modifiers parameter when creating a new MouseEvent instance
• to check modifiersEx of existing MouseEvent

Parameters:

button - is a number to represent a button starting from 1. For example,

 int button = InputEvent.getMaskForButton(1);
 

will have the same meaning as

 int button = InputEvent.getMaskForButton(MouseEvent.BUTTON1);
 

because MouseEvent.BUTTON1 equals to 1. If a mouse has three enabled buttons(see MouseInfo.getNumberOfButtons()) then the values from the left column passed into the method will return corresponding values from the right column:

    button    returned mask
    BUTTON1  BUTTON1_DOWN_MASK
    BUTTON2  BUTTON2_DOWN_MASK
    BUTTON3  BUTTON3_DOWN_MASK
 

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.

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 MouseInfo.getNumberOfButtons().

Throws:

IllegalArgumentException - if button is less than zero or greater than the number of button masks reserved for buttons

Since:

7.0

See Also:

MouseInfo.getNumberOfButtons(), Toolkit.areExtraMouseButtonsEnabled(), getModifiers(), MouseEvent.getModifiersEx()

isShiftDown

public boolean isShiftDown()

Returns whether or not the Shift modifier is down on this event.

isControlDown

public boolean isControlDown()

Returns whether or not the Control modifier is down on this event.

isMetaDown

public boolean isMetaDown()

Returns whether or not the Meta modifier is down on this event.

isAltDown

public boolean isAltDown()

Returns whether or not the Alt modifier is down on this event.

isAltGraphDown

public boolean isAltGraphDown()

Returns whether or not the AltGraph modifier is down on this event.

getWhen

public long getWhen()

Returns the difference in milliseconds between the timestamp of when this event occurred and midnight, January 1, 1970 UTC.

getModifiers

public int getModifiers()

Returns the modifier mask for this event.

getModifiersEx

public int getModifiersEx()

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

For example, if the user presses button 1 followed by button 2, and then releases them in the same order, the following sequence of events is generated:

    MOUSE_PRESSED:  BUTTON1_DOWN_MASK
    MOUSE_PRESSED:  BUTTON1_DOWN_MASK | BUTTON2_DOWN_MASK
    MOUSE_RELEASED: BUTTON2_DOWN_MASK
    MOUSE_CLICKED:  BUTTON2_DOWN_MASK
    MOUSE_RELEASED:
    MOUSE_CLICKED:
 

It is not recommended to compare the return value of this method using == 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:

    int onmask = SHIFT_DOWN_MASK | BUTTON1_DOWN_MASK;
    int offmask = CTRL_DOWN_MASK;
    if ((event.getModifiersEx() & (onmask | offmask)) == onmask) {
        ...
    }
 

The above code will work even if new modifiers are added.

Since:

1.4

consume

public void consume()

Consumes this event so that it will not be processed in the default manner by the source which originated it.

Overrides:

consume in class AWTEvent

isConsumed

public boolean isConsumed()

Returns whether or not this event has been consumed.

Overrides:

isConsumed in class AWTEvent

See Also:

consume()

getModifiersExText

public static String getModifiersExText(int modifiers)

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.

Note that passing negative parameter is incorrect, and will cause the returning an unspecified string. Zero parameter means that no modifiers were passed and will cause the returning an empty string.

Parameters:

modifiers - a modifier mask describing the extended modifier keys and mouse buttons for the event

Returns:

a text description of the combination of extended modifier keys and mouse buttons that were held down during the event.

Since:

1.4