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.

Note: Applications should not depend on all or even any of the input event modifiers defined here to be generated by an implementation.

Note: The timestamps used by this class report the difference, measured in milliseconds, between the time of the event and midnight, January 1, 1970 UTC (similar to System.currentTimeMillis).

Since:

1.1

Version:

1.29 01/23/03

Author:

Carl Quinn

See Also:

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

Field Summary

Fields

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, 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

Fields inherited from class java.util.EventObject

source

Method Summary

Methods

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.
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 timestamp of when this event occurred.
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, 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.

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.

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

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 timestamp of when this event occurred.

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.

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