org.tbee.swing
Class FocusInterpreter

java.lang.Object
  org.tbee.swing.FocusInterpreter

All Implemented Interfaces:

PropertyChangeListener, EventListener

public class FocusInterpreter
extends Object
implements PropertyChangeListener

This class interpretes keyboard focus movements and determines if the focus is lost - to a component within the same application (LOSING_FOCUS followed by a FOCUS_LOST) - or to something outside the application (just LOSING_FOCUS). This allows for more fine tuned behaviour in JTable by force writing an editing cell on FOCUS_LOST. Special consideration is take for popup menus: if though it would be a FOCUS_LOST, this is degraded to a LOSING_FOCUS. All components in the hierarchy to the one actually having focus are assumed to have focus also. This could be a JPanel with a component or a JTable where an editor is active. Listeners for this information must register using addFocusInterpreterListener( FocusInterpreter.FocusInterpreterListener ) This component weak-binds itself to the component, so that if the component could be garbage collected, the FocusInterpreter does not block that. On the next focus event, the FocusInterpreter will detect that the component is gone and will remove itself from the listeners and thus be garbage collected itself.

Version:

$Revision: 1.19 $

Nested Class Summary

static class	FocusInterpreter.FocusInterpreterEvent
static interface	FocusInterpreter.FocusInterpreterListener

Field Summary

static org.apache.log4j.Logger	log4j
static String	SOURCECODE_VERSION Standard variable for determining version of a class file.
static int	STATE_FOCUS_LOST
static int	STATE_GAINED_FOCUS
static int	STATE_LOSING_FOCUS

Constructor Summary

FocusInterpreter(Component component)
remember the component and start listening

Method Summary

void	addFocusListener(FocusInterpreter.FocusInterpreterListener l)
static String	describeState(int state)
void	fireFocusEvent(int state, Component oldComponent, Component newComponent)
int	getState()
boolean	isActive()
void	propertyChange(PropertyChangeEvent ev) Interprete focus events
void	removeFocusListener(FocusInterpreter.FocusInterpreterListener l)
void	setState(int value)
void	start() start interpreting focus events
void	stop() stop interpreting focus events

Methods inherited from class java.lang.Object

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

Field Detail

SOURCECODE_VERSION

public static final String SOURCECODE_VERSION

Standard variable for determining version of a class file.

See Also:

Constant Field Values

log4j

public static org.apache.log4j.Logger log4j

STATE_FOCUS_LOST

public static final int STATE_FOCUS_LOST

See Also:

Constant Field Values

STATE_GAINED_FOCUS

public static final int STATE_GAINED_FOCUS

See Also:

Constant Field Values

STATE_LOSING_FOCUS

public static final int STATE_LOSING_FOCUS

See Also:

Constant Field Values

Constructor Detail

FocusInterpreter

public FocusInterpreter(Component component)

remember the component and start listening

Method Detail

start

public void start()

start interpreting focus events

stop

public void stop()

stop interpreting focus events

isActive

public boolean isActive()

propertyChange

public void propertyChange(PropertyChangeEvent ev)

Interprete focus events

Specified by:

propertyChange in interface PropertyChangeListener

getState

public int getState()

setState

public void setState(int value)

describeState

public static String describeState(int state)

Parameters:

state -

Returns:

addFocusListener

public void addFocusListener(FocusInterpreter.FocusInterpreterListener l)

removeFocusListener

public void removeFocusListener(FocusInterpreter.FocusInterpreterListener l)

fireFocusEvent

public void fireFocusEvent(int state,
                           Component oldComponent,
                           Component newComponent)