MouseInfo (Java 2 Platform SE 5.0) - JDK 5 Documentation v1.5.0, Java 2 SDK 英文文档

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Java^TM 2 Platform
Standard Ed. 5.0

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java.awt
Class MouseInfo

java.lang.Object
  java.awt.MouseInfo

public class MouseInfo
extends Object
extends Object

MouseInfo provides methods for getting information about the mouse, such as mouse pointer location and the number of mouse buttons.

Since:: 1.5

Method Summary

static int getNumberOfButtons()
Returns the number of buttons on the mouse.

static PointerInfo getPointerInfo()
Returns a PointerInfo instance that represents the current location of the mouse pointer.

Methods inherited from class java.lang.Object

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

Method Summary
`static int`	`getNumberOfButtons()` Returns the number of buttons on the mouse.
`static PointerInfo`	`getPointerInfo()` Returns a `PointerInfo` instance that represents the current location of the mouse pointer.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Method Detail

getPointerInfo

public static PointerInfo getPointerInfo()
                                  throws HeadlessException

Returns a PointerInfo instance that represents the current location of the mouse pointer. The GraphicsDevice stored in this PointerInfo contains the mouse pointer. The coordinate system used for the mouse position depends on whether or not the GraphicsDevice is part of a virtual screen device. For virtual screen devices, the coordinates are given in the virtual coordinate system, otherwise they are returned in the coordinate system of the GraphicsDevice. See GraphicsConfiguration for more information about the virtual screen devices. On systems without a mouse, returns null.

If there is a security manager, its checkPermission method is called with an AWTPermission("watchMousePointer") permission before creating and returning a PointerInfo object. This may result in a SecurityException.

Returns:: location of the mouse pointer
Throws:: HeadlessException - if GraphicsEnvironment.isHeadless() returns true; SecurityException - if a security manager exists and its checkPermission method doesn't allow the operation
Since:: 1.5
See Also:: GraphicsConfiguration, SecurityManager.checkPermission(java.security.Permission), AWTPermission

getNumberOfButtons

public static int getNumberOfButtons()
                              throws HeadlessException

Returns the number of buttons on the mouse. On systems without a mouse, returns -1.

Returns:: number of buttons on the mouse
Throws:: HeadlessException - if GraphicsEnvironment.isHeadless() returns true
Since:: 1.5