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## java.awt.event
Class MouseEvent

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

All Implemented Interfaces:
  Serializable

Direct Known Subclasses:
  MenuDragMouseEvent, MouseWheelEvent

public class MouseEvent
extends InputEvent

An event which indicates that a mouse action occurred in a component. A mouse action is considered to occur in a particular component if and only if the mouse cursor is over the unobscured part of the component's bounds when the action happens. Component bounds can be obscurred by the visible component's children or by a menu or by a top-level window. This event is used both for mouse events (click, enter, exit) and mouse motion events (moves and drags).

This low-level event is generated by a component object for:

- Mouse Events
  - a mouse button is pressed
  - a mouse button is released
  - a mouse button is clicked (pressed and released)
  - the mouse cursor enters the unobscured part of component's geometry
  - the mouse cursor exits the unobscured part of component's geometry
- Mouse Motion Events
  - the mouse is moved
  - the mouse is dragged

A `MouseEvent` object is passed to every `MouseListener` or `MouseAdapter` object which is registered to receive the "interesting" mouse events using the component's `addMouseListener` method. (`MouseAdapter` objects implement the `MouseListener` interface.) Each such listener object gets a `MouseEvent` containing the mouse event.

A `MouseEvent` object is also passed to every `MouseMotionListener` or `MouseMotionAdapter` object which is registered to receive mouse motion events using the component's `addMouseMotionListener` method. (`MouseMotionAdapter` objects implement the `MouseMotionListener` interface.) Each such listener object gets a `MouseEvent` containing the mouse motion event.

When a mouse button is clicked, events are generated and sent to the registered `MouseListener`s. The state of modal keys can be retrieved using `InputEvent.getModifiers()` and `InputEvent.getModifiersEx()`. The button mask returned by `InputEvent.getModifiers()` reflects only the button that changed state, not the current state of all buttons. (Note: Due to overlap in the values of ALT_MASK/BUTTON2_MASK and META_MASK/BUTTON3_MASK, this is not always true for mouse events involving modifier keys). To get the state of all buttons and modifier keys, use `InputEvent.getModifiersEx()`. The button which has changed state is returned by `getButton()`

For example, if the first mouse button is pressed, events are sent in the following order:

        id              modifiers    button
        MOUSE_PRESSED:  BUTTON1_MASK BUTTON1
        MOUSE_RELEASED: BUTTON1_MASK BUTTON1
        MOUSE_CLICKED:  BUTTON1_MASK BUTTON1

When multiple mouse buttons are pressed, each press, release, and click results in a separate event.

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:

        id              modifiers    button
        MOUSE_PRESSED:  BUTTON1_MASK BUTTON1
        MOUSE_PRESSED:  BUTTON2_MASK BUTTON2
        MOUSE_RELEASED: BUTTON1_MASK BUTTON1
        MOUSE_CLICKED:  BUTTON1_MASK BUTTON1
        MOUSE_RELEASED: BUTTON2_MASK BUTTON2
        MOUSE_CLICKED:  BUTTON2_MASK BUTTON2

If button 2 is released first, the `MOUSE_RELEASED`/`MOUSE_CLICKED` pair for `BUTTON2_MASK` arrives first, followed by the pair for `BUTTON1_MASK`.

`MOUSE_DRAGGED` events are delivered to the `Component` in which the mouse button was pressed until the mouse button is released (regardless of whether the mouse position is within the bounds of the `Component`). Due to platform-dependent Drag&Drop implementations, `MOUSE_DRAGGED` events may not be delivered during a native Drag&Drop operation. In a multi-screen environment mouse drag events are delivered to the `Component` even if the mouse position is outside the bounds of the `GraphicsConfiguration` associated with that `Component`. However, the reported position for mouse drag events in this case may differ from the actual mouse position:

- In a multi-screen environment without a virtual device:
  The reported coordinates for mouse drag events are clipped to fit within the bounds of the `GraphicsConfiguration` associated with the `Component`.
- In a multi-screen environment with a virtual device:
  The reported coordinates for mouse drag events are clipped to fit within the bounds of the virtual device associated with the `Component`.

Since:
  1.1
See Also:
  `MouseAdapter`, `MouseListener`, `MouseMotionAdapter`, `MouseMotionListener`, `MouseWheelListener`, Tutorial: Writing a Mouse Listener, Tutorial: Writing a Mouse Motion Listener, Reference: The Java Class Libraries (update file), Serialized Form

Field Summary
`static int` | `BUTTON1` Indicates mouse button #1; used by `getButton()`.
`static int` | `BUTTON2` Indicates mouse button #2; used by `getButton()`.
`static int` | `BUTTON3` Indicates mouse button #3; used by `getButton()`.
`static int` | `MOUSE_CLICKED` The "mouse clicked" event.
`static int` | `MOUSE_DRAGGED` The "mouse dragged" event.
`static int` | `MOUSE_ENTERED` The "mouse entered" event.
`static int` | `MOUSE_EXITED` The "mouse exited" event.
`static int` | `MOUSE_FIRST` The first number in the range of ids used for mouse events.
`static int` | `MOUSE_LAST` The last number in the range of ids used for mouse events.
`static int` | `MOUSE_MOVED` The "mouse moved" event.
`static int` | `MOUSE_PRESSED` The "mouse pressed" event.
`static int` | `MOUSE_RELEASED` The "mouse released" event.
`static int` | `MOUSE_WHEEL` The "mouse wheel" event.
`static int` | `NOBUTTON` Indicates no mouse buttons; used by `getButton()`.

Fields inherited from class java.awt.event.InputEvent
`ALT_DOWN_MASK, ALT_GRAPH_DOWN_MASK, ALT_GRAPH_MASK, ALT_MASK, BUTTON1_DOWN_MASK, BUTTON1_MASK, BUTTON2_DOWN_MASK, BUTTON2_MASK, BUTTON3_DOWN_MASK, BUTTON3_MASK, CTRL_DOWN_MASK, CTRL_MASK, META_DOWN_MASK, META_MASK, SHIFT_DOWN_MASK, SHIFT_MASK`

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`

Constructor Summary
`MouseEvent(Component source, int id, long when, int modifiers, int x, int y, int clickCount, boolean popupTrigger)` Constructs a `MouseEvent` object with the specified source component, type, modifiers, coordinates, and click count.
`MouseEvent(Component source, int id, long when, int modifiers, int x, int y, int clickCount, boolean popupTrigger, int button)` Constructs a `MouseEvent` object with the specified source component, type, modifiers, coordinates, and click count.

Method Summary
`int` | `getButton()` Returns which, if any, of the mouse buttons has changed state.
`int` | `getClickCount()` Returns the number of mouse clicks associated with this event.
`static String` | `getMouseModifiersText(int modifiers)` Returns a String describing the modifier keys and mouse buttons that were down during the event, such as "Shift", or "Ctrl+Shift".
`Point` | `getPoint()` Returns the x,y position of the event relative to the source component.
`int` | `getX()` Returns the horizontal x position of the event relative to the source component.
`int` | `getY()` Returns the vertical y position of the event relative to the source component.
`boolean` | `isPopupTrigger()` Returns whether or not this mouse event is the popup menu trigger event for the platform.
`String` | `paramString()` Returns a parameter string identifying this event.
`void` | `translatePoint(int x, int y)` Translates the event's coordinates to a new position by adding specified `x` (horizontal) and `y` (vertical) offsets.

Methods inherited from class java.awt.event.InputEvent
`consume, getModifiers, getModifiersEx, getModifiersExText, getWhen, isAltDown, isAltGraphDown, isConsumed, isControlDown, isMetaDown, isShiftDown`

Methods inherited from class java.awt.event.ComponentEvent
`getComponent`

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

### MOUSE_FIRST

    public static final int MOUSE_FIRST

  The first number in the range of ids used for mouse events.

  See Also:
    Constant Field Values

### MOUSE_LAST

    public static final int MOUSE_LAST

  The last number in the range of ids used for mouse events.

  See Also:
    Constant Field Values

### MOUSE_CLICKED

    public static final int MOUSE_CLICKED

  The "mouse clicked" event. This `MouseEvent` occurs when a mouse button is pressed and released.

  See Also:
    Constant Field Values

### MOUSE_PRESSED

    public static final int MOUSE_PRESSED

  The "mouse pressed" event. This `MouseEvent` occurs when a mouse button is pushed down.

  See Also:
    Constant Field Values

### MOUSE_RELEASED

    public static final int MOUSE_RELEASED

  The "mouse released" event. This `MouseEvent` occurs when a mouse button is let up.

  See Also:
    Constant Field Values

### MOUSE_MOVED

    public static final int MOUSE_MOVED

  The "mouse moved" event. This `MouseEvent` occurs when the mouse position changes.

  See Also:
    Constant Field Values

### MOUSE_ENTERED

    public static final int MOUSE_ENTERED

  The "mouse entered" event. This `MouseEvent` occurs when the mouse cursor enters the unobscured part of component's geometry.

  See Also:
    Constant Field Values

### MOUSE_EXITED

    public static final int MOUSE_EXITED

  The "mouse exited" event. This `MouseEvent` occurs when the mouse cursor exits the unobscured part of component's geometry.

  See Also:
    Constant Field Values

### MOUSE_DRAGGED

    public static final int MOUSE_DRAGGED

  The "mouse dragged" event. This `MouseEvent` occurs when the mouse position changes while a mouse button is pressed.

  See Also:
    Constant Field Values

### MOUSE_WHEEL

    public static final int MOUSE_WHEEL

  The "mouse wheel" event. This is the only `MouseWheelEvent`. It occurs when a mouse equipped with a wheel has its wheel rotated.

  Since:
    1.4
  See Also:
    Constant Field Values

### NOBUTTON

    public static final int NOBUTTON

  Indicates no mouse buttons; used by `getButton()`.

  Since:
    1.4
  See Also:
    Constant Field Values

### BUTTON1

    public static final int BUTTON1

  Indicates mouse button #1; used by `getButton()`.

  Since:
    1.4
  See Also:
    Constant Field Values

### BUTTON2

    public static final int BUTTON2

  Indicates mouse button #2; used by `getButton()`.

  Since:
    1.4
  See Also:
    Constant Field Values

### BUTTON3

    public static final int BUTTON3

  Indicates mouse button #3; used by `getButton()`.

  Since:
    1.4
  See Also:
    Constant Field Values

Constructor Detail

### MouseEvent

    public MouseEvent(Component source,
                      int id,
                      long when,
                      int modifiers,
                      int x,
                      int y,
                      int clickCount,
                      boolean popupTrigger,
                      int button)

  Constructs a `MouseEvent` object with the specified source component, type, modifiers, coordinates, and click count.

  Note that passing in an invalid `id` results in unspecified behavior.

Parameters:
  `source` - the `Component` that originated the event
  `id` - the integer that identifies the event
  `when` - a long int that gives the time the event occurred
  `modifiers` - the modifier keys down during event (e.g. shift, ctrl, alt, meta) Either extended _DOWN_MASK or old _MASK modifiers should be used, but both models should not be mixed in one event. Use of the extended modifiers is preferred.
  `x` - the horizontal x coordinate for the mouse location
  `y` - the vertical y coordinate for the mouse location
  `clickCount` - the number of mouse clicks associated with event
  `popupTrigger` - a boolean, true if this event is a trigger for a popup menu
  `button` - which of the mouse buttons has changed state. `NOBUTTON`, `BUTTON1`, `BUTTON2` or `BUTTON3`.
Throws:
  `IllegalArgumentException` - if if an invalid `button` value is passed in.
Since:
  1.4

### MouseEvent

    public MouseEvent(Component source,
                      int id,
                      long when,
                      int modifiers,
                      int x,
                      int y,
                      int clickCount,
                      boolean popupTrigger)

  Constructs a `MouseEvent` object with the specified source component, type, modifiers, coordinates, and click count.

  Note that passing in an invalid `id` results in unspecified behavior.

Parameters:
  `source` - the `Component` that originated the event
  `id` - the integer that identifies the event
  `when` - a long int that gives the time the event occurred
  `modifiers` - the modifier keys down during event (e.g. shift, ctrl, alt, meta) Either extended _DOWN_MASK or old _MASK modifiers should be used, but both models should not be mixed in one event. Use of the extended modifiers is preferred.
  `x` - the horizontal x coordinate for the mouse location
  `y` - the vertical y coordinate for the mouse location
  `clickCount` - the number of mouse clicks associated with event
  `popupTrigger` - a boolean, true if this event is a trigger for a popup menu

Method Detail

### getX

    public int getX()

  Returns the horizontal x position of the event relative to the source component.

  Returns:
    x an integer indicating horizontal position relative to the component

### getY

    public int getY()

  Returns the vertical y position of the event relative to the source component.

  Returns:
    y an integer indicating vertical position relative to the component

### getPoint

    public Point getPoint()

  Returns the x,y position of the event relative to the source component.

  Returns:
    a `Point` object containing the x and y coordinates relative to the source component

### translatePoint

    public void translatePoint(int x,
                               int y)

  Translates the event's coordinates to a new position by adding specified `x` (horizontal) and `y` (vertical) offsets.

  Parameters:
    `x` - the horizontal x value to add to the current x coordinate position
    `y` - the vertical y value to add to the current y coordinate position

### getClickCount

    public int getClickCount()

  Returns the number of mouse clicks associated with this event.

  Returns:
    integer value for the number of clicks

### getButton

    public int getButton()

  Returns which, if any, of the mouse buttons has changed state.

  Returns:
    one of the following constants: `NOBUTTON`, `BUTTON1`, `BUTTON2` or `BUTTON3`.
  Since:
    1.4

### isPopupTrigger

    public boolean isPopupTrigger()

  Returns whether or not this mouse event is the popup menu trigger event for the platform.

  Note: Popup menus are triggered differently on different systems. Therefore, `isPopupTrigger` should be checked in both `mousePressed` and `mouseReleased` for proper cross-platform functionality.

  Returns:
    boolean, true if this event is the popup menu trigger for this platform

### getMouseModifiersText

    public static String getMouseModifiersText(int modifiers)

  Returns a String describing the modifier keys and mouse buttons that were down during the event, such as "Shift", or "Ctrl+Shift". These strings can be localized by changing the awt.properties file.

  Parameters:
    `modifiers` - a modifier mask describing the modifier keys and mouse buttons that were down during the event
  Returns:
    string a text description of the combination of modifier keys and mouse buttons that were down during the event
  Since:
    1.4

### paramString

    public String paramString()

  Returns a parameter string identifying this event. This method is useful for event-logging and for debugging.

  Overrides:
    `paramString` in class `ComponentEvent`
  Returns:
    a string identifying the event and its attributes

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