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Diffstat (limited to 'odk/examples/DevelopersGuide/Accessibility/EventHandler.java')
| -rw-r--r-- | odk/examples/DevelopersGuide/Accessibility/EventHandler.java | 447 |
1 files changed, 0 insertions, 447 deletions
diff --git a/odk/examples/DevelopersGuide/Accessibility/EventHandler.java b/odk/examples/DevelopersGuide/Accessibility/EventHandler.java deleted file mode 100644 index 611d0d19..00000000 --- a/odk/examples/DevelopersGuide/Accessibility/EventHandler.java +++ /dev/null @@ -1,447 +0,0 @@ -/************************************************************************* - * - * The Contents of this file are made available subject to the terms of - * the BSD license. - * - * Copyright 2000, 2010 Oracle and/or its affiliates. - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. Neither the name of Sun Microsystems, Inc. nor the names of its - * contributors may be used to endorse or promote products derived - * from this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS - * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE - * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, - * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, - * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS - * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND - * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR - * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE - * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - * - *************************************************************************/ - -import java.util.Vector; - -import com.sun.star.uno.AnyConverter; -import com.sun.star.uno.UnoRuntime; -import com.sun.star.uno.Type; -import com.sun.star.accessibility.*; - -/** Handle all the events send from accessibility objects. The events - denoting new or removed top windows are handled as well. - - It does not implement any listener interface as does the - EventListenerProxy class because it is interested only in a sub set of - the event types. -*/ -public class EventHandler -{ - public EventHandler () - { - mnTopWindowCount = 0; - maListenerProxy = new EventListenerProxy (this); - maConnectionTask = new ConnectionTask (maListenerProxy); - maObjectDisplays = new Vector (); - } - - public synchronized void addObjectDisplay (IAccessibleObjectDisplay aDisplay) - { - maObjectDisplays.add (aDisplay); - } - - - public void finalize () - { - // When it is running then cancel the timer that tries to connect to - // the Office. - if (maConnectionTask != null) - maConnectionTask.cancel(); - } - - - - public void disposing (com.sun.star.lang.EventObject aEvent) - { - // Ignored: We are not holding references to accessibility objects. - } - - - - - /** This method is called back when a new top level window has been opened. - */ - public void windowOpened (XAccessible xAccessible) - { - if (xAccessible != null) - { - // Update the counter of currently open top level windows - // observed by this object. - mnTopWindowCount += 1; - - XAccessibleContext xContext = xAccessible.getAccessibleContext(); - if (xContext != null) - { - MessageArea.println ("new top level window has accessible name " - + xContext.getAccessibleName()); - - // Register at all accessible objects of the new window. - new RegistrationThread ( - maListenerProxy, - xContext, - true, - true); - } - else - MessageArea.println ("new top level window is not accessible."); - } - else - MessageArea.println ("new top level window is not accessible."); - } - - - - - public void windowClosed (XAccessible xAccessible) - { - mnTopWindowCount -= 1; - MessageArea.println ("window closed, " + mnTopWindowCount + " still open"); - if (mnTopWindowCount == 0) - { - // This was the last window. Wait for a new connection. - MessageArea.println ("lost connection to office"); - new ConnectionTask (maListenerProxy); - } - if (xAccessible != null) - new RegistrationThread ( - maListenerProxy, - xAccessible.getAccessibleContext(), - false, - true); - } - - - - - /** Print a message that the given object just received the focus. Call - all accessible object diplays and tell them to update. - */ - private synchronized void focusGained (XAccessibleContext xContext) - { - if (xContext != null) - { - MessageArea.println ("focusGained: " + xContext.getAccessibleName() - + " with role " - + NameProvider.getRoleName (xContext.getAccessibleRole())); - - // Tell the object displays to update their views. - for (int i=0; i<maObjectDisplays.size(); i++) - { - IAccessibleObjectDisplay aDisplay = - (IAccessibleObjectDisplay)maObjectDisplays.get(i); - if (aDisplay != null) - aDisplay.setAccessibleObject (xContext); - } - - // Remember the currently focused object. - mxFocusedObject = xContext; - } - else - MessageArea.println ("focusGained: null"); - } - - - - - /** Print a message that the given object just lost the focus. Call - all accessible object diplays and tell them to update. - */ - private synchronized void focusLost (XAccessibleContext xContext) - { - if (xContext != null) - { - MessageArea.println ("focusLost: " - + xContext.getAccessibleName() - + " with role " - + NameProvider.getRoleName (xContext.getAccessibleRole())); - - // Tell the object displays to update their views. - for (int i=0; i<maObjectDisplays.size(); i++) - { - IAccessibleObjectDisplay aDisplay = - (IAccessibleObjectDisplay)maObjectDisplays.get(i); - if (aDisplay != null) - aDisplay.setAccessibleObject (null); - } - mxFocusedObject = null; - } - else - MessageArea.println ("focusLost: null"); - } - - - - - /** Handle a change of the caret position. Ignore this on all objects - but the one currently focused. - */ - private void handleCaretEvent (XAccessibleContext xContext, - long nOldPosition, long nNewPosition) - { - if (xContext == mxFocusedObject) - MessageArea.println ("caret moved from " + nOldPosition + " to " + nNewPosition); - } - - - - - /** Print a message that a state has been changed. - @param xContext - The accessible context of the object whose state has changed. - @param nOldState - When not zero then this value describes a state that has been reset. - @param nNewValue - When not zero then this value describes a state that has been set. - */ - private void handleStateChange (XAccessibleContext xContext, short nOldState, short nNewState) - { - // Determine which state has changed and what is its new value. - short nState; - boolean aNewValue; - if (nOldState >= 0) - { - nState = nOldState; - aNewValue = false; - } - else - { - nState = nNewState; - aNewValue = true; - } - - // Print a message about the changed state. - MessageArea.print ("setting state " + NameProvider.getStateName(nState) - + " to " + aNewValue); - if (xContext != null) - { - MessageArea.println (" at " + xContext.getAccessibleName() + " with role " - + NameProvider.getRoleName(xContext.getAccessibleRole())); - } - else - MessageArea.println (" at null"); - - // Further handling of some states - switch (nState) - { - case AccessibleStateType.FOCUSED: - if (aNewValue) - focusGained (xContext); - else - focusLost (xContext); - } - } - - - - - /** Handle a child event that describes the creation of removal of a - single child. - */ - private void handleChildEvent ( - XAccessibleContext aOldChild, - XAccessibleContext aNewChild) - { - if (aOldChild != null) - // Remove event listener from the child and all of its descendants. - new RegistrationThread (maListenerProxy, aOldChild, false, false); - else if (aNewChild != null) - // Add event listener to the new child and all of its descendants. - new RegistrationThread (maListenerProxy, aNewChild, true, false); - } - - - - - /** Handle the change of some visible data of an object. - */ - private void handleVisibleDataEvent (XAccessibleContext xContext) - { - // The given object may affect the visible appearance of the focused - // object even when the two are not identical when the given object - // is an ancestor of the focused object. - // In order to not check this we simply call an update on the - // focused object. - if (mxFocusedObject != null) - for (int i=0; i<maObjectDisplays.size(); i++) - { - IAccessibleObjectDisplay aDisplay = - (IAccessibleObjectDisplay)maObjectDisplays.get(i); - if (aDisplay != null) - aDisplay.updateAccessibleObject (mxFocusedObject); - } - } - - - - - /** Print some information about an event that is not handled by any - more specialized handler. - */ - private void handleGenericEvent ( - int nEventId, - Object aSource, - Object aOldValue, - Object aNewValue) - { - // Print event to message area. - MessageArea.print ("received event " - + NameProvider.getEventName (nEventId) + " from "); - XAccessibleContext xContext = objectToContext (aSource); - if (xContext != null) - MessageArea.print (xContext.getAccessibleName()); - else - MessageArea.print ("null"); - MessageArea.println (" / " - + NameProvider.getRoleName(xContext.getAccessibleRole())); - } - - - - /** This is the main method for handling accessibility events. It is - assumed that it is not called directly from the Office but from a - listener proxy that runs in a separate thread so that calls back to - the Office do not result in dead-locks. - */ - public void notifyEvent (com.sun.star.accessibility.AccessibleEventObject aEvent) - { - try // Guard against disposed objects. - { - switch (aEvent.EventId) - { - case AccessibleEventId.CHILD: - handleChildEvent ( - objectToContext (aEvent.OldValue), - objectToContext (aEvent.NewValue)); - break; - - case AccessibleEventId.STATE_CHANGED: - { - short nOldState = -1; - short nNewState = -1; - try - { - if (AnyConverter.isShort (aEvent.NewValue)) - nNewState = AnyConverter.toShort (aEvent.NewValue); - if (AnyConverter.isShort (aEvent.OldValue)) - nOldState = AnyConverter.toShort (aEvent.OldValue); - } - catch (com.sun.star.lang.IllegalArgumentException e) - {} - handleStateChange ( - objectToContext (aEvent.Source), - nOldState, - nNewState); - } - break; - - case AccessibleEventId.VISIBLE_DATA_CHANGED: - case AccessibleEventId.BOUNDRECT_CHANGED: - handleVisibleDataEvent (objectToContext (aEvent.Source)); - break; - - case AccessibleEventId.CARET_CHANGED: - try - { - handleCaretEvent ( - objectToContext (aEvent.Source), - AnyConverter.toLong(aEvent.OldValue), - AnyConverter.toLong(aEvent.NewValue)); - } - catch (com.sun.star.lang.IllegalArgumentException e) - {} - break; - - default: - handleGenericEvent (aEvent.EventId, - aEvent.Source, aEvent.OldValue, aEvent.NewValue); - break; - } - } - catch (com.sun.star.lang.DisposedException e) - {} - } - - - - - /** Convert the given object into an accessible context. The object is - interpreted as UNO Any and may contain either an XAccessible or - XAccessibleContext reference. - @return - The returned value is null when the given object can not be - converted to an XAccessibleContext reference. - */ - private XAccessibleContext objectToContext (Object aObject) - { - XAccessibleContext xContext = null; - XAccessible xAccessible = null; - try - { - xAccessible = (XAccessible)AnyConverter.toObject( - new Type(XAccessible.class), aObject); - } - catch (com.sun.star.lang.IllegalArgumentException e) - {} - if (xAccessible != null) - xContext = xAccessible.getAccessibleContext(); - else - try - { - xContext = (XAccessibleContext)AnyConverter.toObject( - new Type(XAccessibleContext.class), aObject); - } - catch (com.sun.star.lang.IllegalArgumentException e) - {} - return xContext; - } - - - - - /** The proxy that runs in a seperate thread and allows to call back to - the Office without running into dead-locks. - */ - private EventListenerProxy maListenerProxy; - - /** The currently focused object. A value of null means that no object - has the focus. - */ - private XAccessibleContext mxFocusedObject; - - /** Keep track of the currently open top windows to start a registration - loop when the last window (and the Office) is closed. - */ - private long mnTopWindowCount; - - /** A list of objects that can display accessible objects in specific - ways such as showing a graphical representation or some textual - descriptions. - */ - private Vector maObjectDisplays; - - /** The timer task that attempts in regular intervals to connect to a - running Office application. - */ - private ConnectionTask maConnectionTask; -} |