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Java™ Platform
Standard Ed. 7

DRAFT ea-b118

java.awt.event
Class MouseEvent

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
                  extended by 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. For lightweight components, such as Swing's components, mouse events are only dispatched to the component if the mouse event type has been enabled on the component. A mouse event type is enabled by adding the appropriate mouse-based EventListener to the component (MouseListener or MouseMotionListener), or by invoking Component.enableEvents(long) with the appropriate mask parameter (AWTEvent.MOUSE_EVENT_MASK or AWTEvent.MOUSE_MOTION_EVENT_MASK). If the mouse event type has not been enabled on the component, the corresponding mouse events are dispatched to the first ancestor that has enabled the mouse event type.

For example, if a MouseListener has been added to a component, or enableEvents(AWTEvent.MOUSE_EVENT_MASK) has been invoked, then all the events defined by MouseListener are dispatched to the component. On the other hand, if a MouseMotionListener has not been added and enableEvents has not been invoked with AWTEvent.MOUSE_MOTION_EVENT_MASK, then mouse motion events are not dispatched to the component. Instead the mouse motion events are dispatched to the first ancestors that has enabled mouse motion events.

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

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 MouseListeners. 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.

Some extra mouse buttons are added to extend the standard set of buttons represented by the following constants:BUTTON1, BUTTON2, and BUTTON3. Extra buttons have no assigned BUTTONx constants as well as their button masks have no assigned BUTTONx_DOWN_MASK constants. Nevertheless, ordinal numbers starting from 4 may be used as button numbers (button ids). Values obtained by the getMaskForButton(button) method may be used as button masks.

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:

An unspecified behavior will be caused if the id parameter of any particular MouseEvent instance is not in the range from MOUSE_FIRST to MOUSE_LAST-1 (MOUSE_WHEEL is not acceptable).

Since:
1.1
See Also:
MouseAdapter, MouseListener, MouseMotionAdapter, MouseMotionListener, MouseWheelListener, Tutorial: Writing a Mouse Listener, Tutorial: Writing a Mouse Motion Listener, Serialized Form

Field Summary
Modifier and Type Field and Description
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
Constructor and Description
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, click count, and popupTrigger flag.
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, time, modifiers, coordinates, click count, popupTrigger flag, and button number.
MouseEvent(Component source, int id, long when, int modifiers, int x, int y, int xAbs, int yAbs, int clickCount, boolean popupTrigger, int button)
          Constructs a MouseEvent object with the specified source component, type, time, modifiers, coordinates, absolute coordinates, click count, popupTrigger flag, and button number.
 
Method Summary
Modifier and Type Method and Description
 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.
 Point getLocationOnScreen()
          Returns the absolute x, y position of the event.
 int getModifiersEx()
          Returns the extended modifier mask for this event.
static String getMouseModifiersText(int modifiers)
          Returns a String instance 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 getXOnScreen()
          Returns the absolute horizontal x position of the event.
 int getY()
          Returns the vertical y position of the event relative to the source component.
 int getYOnScreen()
          Returns the absolute vertical y position of the event.
 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, getMaskForButton, getModifiers, 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, time, modifiers, coordinates, click count, popupTrigger flag, and button number.

Creating an invalid event (such as by using more than one of the old _MASKs, or modifier/button values which don't match) results in unspecified behavior. An invocation of the form MouseEvent(source, id, when, modifiers, x, y, clickCount, popupTrigger, button) behaves in exactly the same way as the invocation MouseEvent(source, id, when, modifiers, x, y, xAbs, yAbs, clickCount, popupTrigger, button) where xAbs and yAbs defines as source's location on screen plus relative coordinates x and y. xAbs and yAbs are set to zero if the source is not showing. This method throws an IllegalArgumentException if source is null.

Parameters:
source - The Component that originated the event
id - An integer indicating the type of event. For information on allowable values, see the class description for MouseEvent
when - A long integer that gives the time the event occurred. Passing negative or zero value is not recommended
modifiers - The modifier keys down during event (e.g. shift, ctrl, alt, meta) Passing negative parameter is not recommended. Zero value means that no modifiers were passed. Use either an extended _DOWN_MASK or old _MASK modifiers, however do not mix models in the one event. The extended modifiers are preferred for using
x - The horizontal x coordinate for the mouse location. It is allowed to pass negative values
y - The vertical y coordinate for the mouse location. It is allowed to pass negative values
clickCount - The number of mouse clicks associated with event. Passing negative value is not recommended
popupTrigger - A boolean that equals true if this event is a trigger for a popup menu
button - An integer that indicates, which of the mouse buttons has changed its state. The following rules are applied to this parameter:
  • If support for the extended mouse buttons is disabled by Java then it is allowed to create MouseEvent objects only with the standard buttons: NOBUTTON, BUTTON1, BUTTON2, and BUTTON3.
  • If support for the extended mouse buttons is enabled by Java then it is allowed to create MouseEvent objects with the standard buttons. In case the support for extended mouse buttons is enabled by Java, then in addition to the standard buttons, MouseEvent objects can be created using buttons from the range starting from 4 to MouseInfo.getNumberOfButtons() if the mouse has more than three buttons.
Throws:
IllegalArgumentException - if button is less then zero
IllegalArgumentException - if source is null
IllegalArgumentException - if button is greater then BUTTON3 and the support for extended mouse buttons is disabled by Java
IllegalArgumentException - if button is greater then the current number of buttons and the support for extended mouse buttons is enabled by Java
IllegalArgumentException - if an invalid button value is passed in
IllegalArgumentException - if source is null
Since:
1.4
See Also:
EventObject.getSource(), AWTEvent.getID(), InputEvent.getWhen(), InputEvent.getModifiers(), getX(), getY(), getClickCount(), isPopupTrigger(), getButton()

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, click count, and popupTrigger flag. An invocation of the form MouseEvent(source, id, when, modifiers, x, y, clickCount, popupTrigger) behaves in exactly the same way as the invocation MouseEvent(source, id, when, modifiers, x, y, xAbs, yAbs, clickCount, popupTrigger, MouseEvent.NOBUTTON) where xAbs and yAbs defines as source's location on screen plus relative coordinates x and y. xAbs and yAbs are set to zero if the source is not showing. This method throws an IllegalArgumentException if source is null.

Parameters:
source - The Component that originated the event
id - An integer indicating the type of event. For information on allowable values, see the class description for MouseEvent
when - A long integer that gives the time the event occurred. Passing negative or zero value is not recommended
modifiers - The modifier keys down during event (e.g. shift, ctrl, alt, meta) Passing negative parameter is not recommended. Zero value means that no modifiers were passed. Use either an extended _DOWN_MASK or old _MASK modifiers, however do not mix models in the one event. The extended modifiers are preferred for using
x - The horizontal x coordinate for the mouse location. It is allowed to pass negative values
y - The vertical y coordinate for the mouse location. It is allowed to pass negative values
clickCount - The number of mouse clicks associated with event. Passing negative value is not recommended
popupTrigger - A boolean that equals true if this event is a trigger for a popup menu
Throws:
IllegalArgumentException - if source is null
See Also:
EventObject.getSource(), AWTEvent.getID(), InputEvent.getWhen(), InputEvent.getModifiers(), getX(), getY(), getClickCount(), isPopupTrigger()

MouseEvent

public MouseEvent(Component source,
                  int id,
                  long when,
                  int modifiers,
                  int x,
                  int y,
                  int xAbs,
                  int yAbs,
                  int clickCount,
                  boolean popupTrigger,
                  int button)
Constructs a MouseEvent object with the specified source component, type, time, modifiers, coordinates, absolute coordinates, click count, popupTrigger flag, and button number.

Creating an invalid event (such as by using more than one of the old _MASKs, or modifier/button values which don't match) results in unspecified behavior. Even if inconsistent values for relative and absolute coordinates are passed to the constructor, the mouse event instance is still created and no exception is thrown. This method throws an IllegalArgumentException if source is null.

Parameters:
source - The Component that originated the event
id - An integer indicating the type of event. For information on allowable values, see the class description for MouseEvent
when - A long integer that gives the time the event occurred. Passing negative or zero value is not recommended
modifiers - The modifier keys down during event (e.g. shift, ctrl, alt, meta) Passing negative parameter is not recommended. Zero value means that no modifiers were passed. Use either an extended _DOWN_MASK or old _MASK modifiers, however do not mix models in the one event. The extended modifiers are preferred for using
x - The horizontal x coordinate for the mouse location. It is allowed to pass negative values
y - The vertical y coordinate for the mouse location. It is allowed to pass negative values
xAbs - The absolute horizontal x coordinate for the mouse location It is allowed to pass negative values
yAbs - The absolute vertical y coordinate for the mouse location It is allowed to pass negative values
clickCount - The number of mouse clicks associated with event. Passing negative value is not recommended
popupTrigger - A boolean that equals true if this event is a trigger for a popup menu
button - An integer that indicates, which of the mouse buttons has changed its state. The following rules are applied to this parameter:
  • If support for the extended mouse buttons is disabled by Java then it is allowed to create MouseEvent objects only with the standard buttons: NOBUTTON, BUTTON1, BUTTON2, and BUTTON3.
  • If support for the extended mouse buttons is enabled by Java then it is allowed to create MouseEvent objects with the standard buttons. In case the support for extended mouse buttons is enabled by Java, then in addition to the standard buttons, MouseEvent objects can be created using buttons from the range starting from 4 to MouseInfo.getNumberOfButtons() if the mouse has more than three buttons.
Throws:
IllegalArgumentException - if button is less then zero
IllegalArgumentException - if source is null
IllegalArgumentException - if button is greater then BUTTON3 and the support for extended mouse buttons is disabled by Java
IllegalArgumentException - if button is greater then the current number of buttons and the support for extended mouse buttons is enabled by Java
IllegalArgumentException - if an invalid button value is passed in
IllegalArgumentException - if source is null
Since:
1.6
See Also:
EventObject.getSource(), AWTEvent.getID(), InputEvent.getWhen(), InputEvent.getModifiers(), getX(), getY(), getXOnScreen(), getYOnScreen(), getClickCount(), isPopupTrigger(), getButton(), button, Toolkit.areExtraMouseButtonsEnabled(), MouseInfo.getNumberOfButtons(), InputEvent.getMaskForButton(int)
Method Detail

getLocationOnScreen

public Point getLocationOnScreen()
Returns the absolute x, y position of the event. In a virtual device multi-screen environment in which the desktop area could span multiple physical screen devices, these coordinates are relative to the virtual coordinate system. Otherwise, these coordinates are relative to the coordinate system associated with the Component's GraphicsConfiguration.

Returns:
a Point object containing the absolute x and y coordinates.
Since:
1.6
See Also:
GraphicsConfiguration

getXOnScreen

public int getXOnScreen()
Returns the absolute horizontal x position of the event. In a virtual device multi-screen environment in which the desktop area could span multiple physical screen devices, this coordinate is relative to the virtual coordinate system. Otherwise, this coordinate is relative to the coordinate system associated with the Component's GraphicsConfiguration.

Returns:
x an integer indicating absolute horizontal position.
Since:
1.6
See Also:
GraphicsConfiguration

getYOnScreen

public int getYOnScreen()
Returns the absolute vertical y position of the event. In a virtual device multi-screen environment in which the desktop area could span multiple physical screen devices, this coordinate is relative to the virtual coordinate system. Otherwise, this coordinate is relative to the coordinate system associated with the Component's GraphicsConfiguration.

Returns:
y an integer indicating absolute vertical position.
Since:
1.6
See Also:
GraphicsConfiguration

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.

Overrides:
getModifiersEx in class InputEvent

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. The returned value is ranged from 0 to the MouseInfo.getNumberOfButtons() value. The returned value includes at least the following constants: It is allowed to use those constants to compare with the returned button number in the application. For example,
 if (anEvent.getButton() == MouseEvent.BUTTON1) {
 
In particular, for a mouse with one, two, or three buttons this method may return the following values: Button numbers greater then BUTTON3 have no constant identifier. So if a mouse with five buttons is installed, this method may return the following values:

Note: If support for extended mouse buttons is disabled by Java then the AWT event subsystem does not produce mouse events for the extended mouse buttons. So it is not expected that this method returns anything except NOBUTTON, BUTTON1, BUTTON2, BUTTON3.

Returns:
one of the values from 0 to MouseInfo.getNumberOfButtons() if support for the extended mouse buttons is enabled by Java. That range includes NOBUTTON, BUTTON1, BUTTON2, BUTTON3;
NOBUTTON, BUTTON1, BUTTON2 or BUTTON3 if support for the extended mouse buttons is disabled by Java
Since:
1.4
See Also:
Toolkit.areExtraMouseButtonsEnabled(), MouseInfo.getNumberOfButtons(), MouseEvent(Component, int, long, int, int, int, int, int, int, boolean, int), InputEvent.getMaskForButton(int)

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 instance 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.

Note that the InputEvent.ALT_MASK and InputEvent.BUTTON2_MASK have equal values, so the "Alt" string is returned for both modifiers. Likewise, the InputEvent.META_MASK and InputEvent.BUTTON3_MASK have equal values, so the "Meta" string is returned for both modifiers.

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 modifier keys and mouse buttons that were down during the event
Returns:
string string text description of the combination of modifier keys and mouse buttons that were down during the event
Since:
1.4
See Also:
InputEvent.getModifiersExText(int)

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

Java™ Platform
Standard Ed. 7

DRAFT ea-b118

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DRAFT ea-b118

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