java.lang.Object
com.sun.java.accessibility.util.EventQueueMonitor
- All Implemented Interfaces:
AWTEventListener
,EventListener
The
EventQueueMonitor
class provides key core functionality for Assistive
Technologies (and other system-level technologies that need some of the same
things that Assistive Technology needs).- See Also:
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionstatic void
Adds the specified listener to be notified when the GUI subsystem is initialized.static void
Adds the specified listener to be notified when a top level window is created or destroyed.void
eventDispatched
(AWTEvent theEvent) Handle events as a result of registering a listener on theEventQueue
inmaybeInitialize()
.static Accessible
Obtain theAccessible
object at the given point on the Screen.static Point
Return the last recorded position of the mouse in screen coordinates.static Window[]
Return the list of top level Windows in use in the Java Virtual Machine.static Window
Return the top levelWindow
that currently has keyboard focus.static boolean
Says whether the GUI subsystem has been initialized or not.static void
Tell theEventQueueMonitor
to start listening for events.static void
Removes the specified listener to be notified when the GUI subsystem is initialized.static void
Removes the specified listener to be notified when a top level window is created or destroyed.
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Constructor Details
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EventQueueMonitor
public EventQueueMonitor()Create a newEventQueueMonitor
instance. Normally, this will be called only by the AWT Toolkit during initialization time. Assistive technologies should not create instances of EventQueueMonitor by themselves. Instead, they should either refer to it directly via the static methods in this class, e.g.,getCurrentMousePosition()
or obtain the instance by asking the Toolkit, e.g.,Toolkit.getSystemEventQueue()
.
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Method Details
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maybeInitialize
public static void maybeInitialize()Tell theEventQueueMonitor
to start listening for events. -
eventDispatched
Handle events as a result of registering a listener on theEventQueue
inmaybeInitialize()
.- Specified by:
eventDispatched
in interfaceAWTEventListener
- Parameters:
theEvent
- the event to be processed
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getAccessibleAt
Obtain theAccessible
object at the given point on the Screen. The return value may be null if anAccessible
object cannot be found at the particular point.- Parameters:
p
- the point to be accessed- Returns:
- the
Accessible
at the specified point
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isGUIInitialized
public static boolean isGUIInitialized()Says whether the GUI subsystem has been initialized or not. If this returns true, the assistive technology can freely create GUI component instances. If the return value is false, the assistive technology should register aGUIInitializedListener
and wait to create GUI component instances until the listener is called.- Returns:
- true if the GUI subsystem has been initialized
- See Also:
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addGUIInitializedListener
Adds the specified listener to be notified when the GUI subsystem is initialized. Assistive technologies should get the results ofisGUIInitialized()
before calling this method.- Parameters:
l
- the listener to add- See Also:
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removeGUIInitializedListener
Removes the specified listener to be notified when the GUI subsystem is initialized.- Parameters:
l
- the listener to remove- See Also:
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addTopLevelWindowListener
Adds the specified listener to be notified when a top level window is created or destroyed.- Parameters:
l
- the listener to add- See Also:
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removeTopLevelWindowListener
Removes the specified listener to be notified when a top level window is created or destroyed.- Parameters:
l
- the listener to remove- See Also:
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getCurrentMousePosition
Return the last recorded position of the mouse in screen coordinates.- Returns:
- the last recorded position of the mouse in screen coordinates
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getTopLevelWindows
Return the list of top level Windows in use in the Java Virtual Machine.- Returns:
- an array of top level
Window
s in use in the Java Virtual Machine
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getTopLevelWindowWithFocus
Return the top levelWindow
that currently has keyboard focus.- Returns:
- the top level
Window
that currently has keyboard focus
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