Class EventQueueMonitor

java.lang.Object
com.sun.java.accessibility.util.EventQueueMonitor
All Implemented Interfaces:
AWTEventListener, EventListener
public class EventQueueMonitor extends Object implements AWTEventListener
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:

  • Constructor Details

    • EventQueueMonitor

      public EventQueueMonitor()
      Create a new EventQueueMonitor 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().

  • Method Details

    • maybeInitialize

      public static void maybeInitialize()
      Tell the EventQueueMonitor to start listening for events.

    • eventDispatched

      public void eventDispatched(AWTEvent theEvent)
      Handle events as a result of registering a listener on the EventQueue in maybeInitialize().
      Specified by:
      eventDispatched in interface AWTEventListener
      Parameters:
      theEvent - the event to be processed

    • getAccessibleAt

      public static Accessible getAccessibleAt(Point p)
      Obtain the Accessible object at the given point on the Screen. The return value may be null if an Accessible object cannot be found at the particular point.
      Parameters:
      p - the point to be accessed
      Returns:
      the Accessible at the specified point

    • 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 a GUIInitializedListener and wait to create GUI component instances until the listener is called.
      Returns:
      true if the GUI subsystem has been initialized
      See Also:

    • addGUIInitializedListener

      public static void addGUIInitializedListener(GUIInitializedListener l)
      Adds the specified listener to be notified when the GUI subsystem is initialized. Assistive technologies should get the results of isGUIInitialized() before calling this method.
      Parameters:
      l - the listener to add
      See Also:

    • removeGUIInitializedListener

      public static void removeGUIInitializedListener(GUIInitializedListener l)
      Removes the specified listener to be notified when the GUI subsystem is initialized.
      Parameters:
      l - the listener to remove
      See Also:

    • addTopLevelWindowListener

      public static void addTopLevelWindowListener(TopLevelWindowListener l)
      Adds the specified listener to be notified when a top level window is created or destroyed.
      Parameters:
      l - the listener to add
      See Also:

    • removeTopLevelWindowListener

      public static void removeTopLevelWindowListener(TopLevelWindowListener l)
      Removes the specified listener to be notified when a top level window is created or destroyed.
      Parameters:
      l - the listener to remove
      See Also:

    • getCurrentMousePosition

      public static Point getCurrentMousePosition()
      Return the last recorded position of the mouse in screen coordinates.
      Returns:
      the last recorded position of the mouse in screen coordinates

    • getTopLevelWindows

      public static Window[] getTopLevelWindows()
      Return the list of top level Windows in use in the Java Virtual Machine.
      Returns:
      an array of top level Windows in use in the Java Virtual Machine

    • getTopLevelWindowWithFocus

      public static Window getTopLevelWindowWithFocus()
      Return the top level Window that currently has keyboard focus.
      Returns:
      the top level Window that currently has keyboard focus