# 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 sealed class InputEvent extends ComponentEvent permits KeyEvent, MouseEvent
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

  Fields
  Modifier and Type
  Field
  Description
  `static final int`
  `ALT_DOWN_MASK`
  The Alt key extended modifier constant.
  `static final int`
  `ALT_GRAPH_DOWN_MASK`
  The AltGraph key extended modifier constant.
  `static final int`
  `ALT_GRAPH_MASK`
  Deprecated.
  It is recommended that ALT_GRAPH_DOWN_MASK and `getModifiersEx()` be used instead
  `static final int`
  `ALT_MASK`
  Deprecated.
  It is recommended that ALT_DOWN_MASK and `getModifiersEx()` be used instead
  `static final int`
  `BUTTON1_DOWN_MASK`
  The Mouse Button1 extended modifier constant.
  `static final int`
  `BUTTON1_MASK`
  Deprecated.
  It is recommended that BUTTON1_DOWN_MASK and `getModifiersEx()` be used instead
  `static final int`
  `BUTTON2_DOWN_MASK`
  The Mouse Button2 extended modifier constant.
  `static final int`
  `BUTTON2_MASK`
  Deprecated.
  It is recommended that BUTTON2_DOWN_MASK and `getModifiersEx()` be used instead.
  `static final int`
  `BUTTON3_DOWN_MASK`
  The Mouse Button3 extended modifier constant.
  `static final int`
  `BUTTON3_MASK`
  Deprecated.
  It is recommended that BUTTON3_DOWN_MASK and `getModifiersEx()` be used instead.
  `static final int`
  `CTRL_DOWN_MASK`
  The Control key extended modifier constant.
  `static final int`
  `CTRL_MASK`
  Deprecated.
  It is recommended that CTRL_DOWN_MASK and `getModifiersEx()` be used instead
  `static final int`
  `META_DOWN_MASK`
  The Meta key extended modifier constant.
  `static final int`
  `META_MASK`
  Deprecated.
  It is recommended that META_DOWN_MASK and `getModifiersEx()` be used instead
  `static final int`
  `SHIFT_DOWN_MASK`
  The Shift key extended modifier constant.
  `static final int`
  `SHIFT_MASK`
  Deprecated.
  It is recommended that SHIFT_DOWN_MASK and `getModifiersEx()` be used instead

  ### Fields declared in class ComponentEvent

  `COMPONENT_FIRST, COMPONENT_HIDDEN, COMPONENT_LAST, COMPONENT_MOVED, COMPONENT_RESIZED, COMPONENT_SHOWN`

  ### Fields declared in class 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 declared in class EventObject

  `source`

- ## Method Summary

  Modifier and Type
  Method
  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()`
  Deprecated.
  It is recommended that extended modifier keys and `getModifiersEx()` be used instead
  `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 declared in class ComponentEvent

  `getComponent, paramString`

  ### Methods declared in class AWTEvent

  `getID, setSource, toString`

  ### Methods declared in class EventObject

  `getSource`

  ### Methods declared in class Object

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

- ## Field Details

  - ### SHIFT_MASK

    @Deprecated(since="9") public static final int SHIFT_MASK
    Deprecated.
    It is recommended that SHIFT_DOWN_MASK and `getModifiersEx()` be used instead
    The Shift key modifier constant.
    See Also:
      - Constant Field Values

  - ### CTRL_MASK

    @Deprecated(since="9") public static final int CTRL_MASK
    Deprecated.
    It is recommended that CTRL_DOWN_MASK and `getModifiersEx()` be used instead
    The Control key modifier constant.
    See Also:
      - Constant Field Values

  - ### META_MASK

    @Deprecated(since="9") public static final int META_MASK
    Deprecated.
    It is recommended that META_DOWN_MASK and `getModifiersEx()` be used instead
    The Meta key modifier constant.
    See Also:
      - Constant Field Values

  - ### ALT_MASK

    @Deprecated(since="9") public static final int ALT_MASK
    Deprecated.
    It is recommended that ALT_DOWN_MASK and `getModifiersEx()` be used instead
    The Alt key modifier constant.
    See Also:
      - Constant Field Values

  - ### ALT_GRAPH_MASK

    @Deprecated(since="9") public static final int ALT_GRAPH_MASK
    Deprecated.
    It is recommended that ALT_GRAPH_DOWN_MASK and `getModifiersEx()` be used instead
    The AltGraph key modifier constant.
    See Also:
      - Constant Field Values

  - ### BUTTON1_MASK

    @Deprecated(since="9") public static final int BUTTON1_MASK
    Deprecated.
    It is recommended that BUTTON1_DOWN_MASK and `getModifiersEx()` be used instead
    The Mouse Button1 modifier constant.
    See Also:
      - Constant Field Values

  - ### BUTTON2_MASK

    @Deprecated(since="9") public static final int BUTTON2_MASK
    Deprecated.
    It is recommended that BUTTON2_DOWN_MASK and `getModifiersEx()` be used instead. Note that BUTTON2_MASK has the same value as ALT_MASK.
    The Mouse Button2 modifier constant.
    See Also:
      - Constant Field Values

  - ### BUTTON3_MASK

    @Deprecated(since="9") public static final int BUTTON3_MASK
    Deprecated.
    It is recommended that BUTTON3_DOWN_MASK and `getModifiersEx()` be used instead. Note that BUTTON3_MASK has the same value as META_MASK.
    The Mouse Button3 modifier constant.
    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 Details

  - ### 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()`.

    Returns:
      a mask for an existing mouse button.
    Throws:
      `IllegalArgumentException` - if `button` is less than zero or greater than the number of button masks reserved for buttons
    Since:
      1.7
    See Also:
      - `MouseInfo.getNumberOfButtons()`
      - `Toolkit.areExtraMouseButtonsEnabled()`
      - `getModifiers()`
      - `getModifiersEx()`

  - ### isShiftDown

    public boolean isShiftDown()
    Returns whether or not the Shift modifier is down on this event.
    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.
    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.
    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.
    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.
    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.
    Returns:
      the difference in milliseconds between the timestamp and midnight, January 1, 1970 UTC

  - ### getModifiers

    @Deprecated(since="9") public int getModifiers()
    Deprecated.
    It is recommended that extended modifier keys and `getModifiersEx()` be used instead
    Returns the modifier mask for this event.
    Returns:
      the modifier mask for this event

  - ### getModifiersEx

    public int getModifiersEx()
    Returns the extended modifier mask for this event.

    Extended modifiers are the modifiers that ends with the _DOWN_MASK suffix, such as ALT_DOWN_MASK, BUTTON1_DOWN_MASK, and others.

    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.
    Returns:
      the extended modifier mask for this event
    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`
    Returns:
      whether or not this event has been consumed
    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