Java™ Platform
Standard Ed. 6

java.awt.event
Class InputEvent

java.lang.Object
  extended by java.util.EventObject
      extended by java.awt.AWTEvent
          extended by java.awt.event.ComponentEvent
              extended by 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
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
 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, 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

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

Java™ Platform
Standard Ed. 6

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