public class ActiveComponent extends java.awt.Component implements CSProcess
java.awt.Component
with a channel interface.
All channels are optional. The configure channel is settable from a constructor. Event channels can be added to notify the occurrence of any type of Event the component generates (by calling the appropriate addXXXEventChannel method before the process is run). Messages can be sent down the configure channel at any time to configure the component. See the table below for details.
All channels are managed by independent internal handler processes. It is, therefore, safe for a serial application process both to service an event channel and configure the component -- no deadlock can occur.
IMPORTANT: it is essential that event channels from this process are always serviced -- otherwise the Java Event Thread will be blocked and the GUI will stop responding. A simple way to guarantee this is to use channels configured with overwriting buffers. For example:
final One2OneChannel myMouseEvent = Channel.one2one (new OverWriteOldestBuffer (n)); final ActiveComponent myComponent = new ActiveComponent (); myComponent.addMouseEventChannel (myMouseEvent.out ());This will ensure that the Java Event Thread will never be blocked. Slow or inattentive readers may miss rapidly generated events, but the n most recent events will always be available.
Input Channels | ||
---|---|---|
configure | ActiveComponent.Configure | Invoke the user-defined Configure.configure method on the component. |
Output Channels | ||
componentEvent | ComponentEvent | See the addComponentEventChannel method. |
focusEvent | FocusEvent | See the addFocusEventChannel method. |
keyEvent | KeyEvent | See the addKeyEventChannel method. |
mouseEvent | MouseEvent | See the addMouseEventChannel method. |
mouseMotionEvent | MouseEvent | See the addMouseMotionEventChannel method. |
import java.awt.*; import java.awt.event.*; import org.jcsp.util.*; import org.jcsp.lang.*; import org.jcsp.awt.*; public class ActiveComponentExample { public static void main (String argv[]) { final Frame root = new Frame ("ActiveComponent Example"); final One2OneChannel mouseEvent = Channel.one2one (new OverWriteOldestBuffer (10)); final ActiveComponent component = new ActiveComponent (); component.addMouseEventChannel (mouseEvent.out ()); root.add (component); root.setSize (400, 400); root.setVisible (true); new Parallel ( new CSProcess[] { component, new CSProcess () { public void run () { boolean running = true; while (running) { final MouseEvent event = (MouseEvent) mouseEvent.in ().read (); switch (event.getID ()) { case MouseEvent.MOUSE_ENTERED: System.out.println ("MOUSE_ENTERED"); break; case MouseEvent.MOUSE_EXITED: System.out.println ("MOUSE_EXITED"); break; case MouseEvent.MOUSE_PRESSED: System.out.println ("MOUSE_PRESSED"); break; case MouseEvent.MOUSE_RELEASED: System.out.println ("MOUSE_RELEASED"); break; case MouseEvent.MOUSE_CLICKED: if (event.getClickCount() > 1) { System.out.println ("MOUSE_DOUBLE_CLICKED ... goodbye!"); running = false; } else { System.out.println ("MOUSE_CLICKED ... *double* click to quit!"); } break; } } root.setVisible (false); System.exit (0); } } } ).run (); } }
Component
,
ComponentEvent
,
FocusEvent
,
KeyEvent
,
MouseEvent
,
OverWriteOldestBuffer
,
Serialized FormModifier and Type | Class and Description |
---|---|
static interface |
ActiveComponent.Configure
This enables general configuration of this component.
|
Modifier and Type | Field and Description |
---|---|
private ChannelInput |
configure
The channel from which configuration messages arrive.
|
private java.util.Vector |
vec
The Vector construct containing the handlers.
|
Constructor and Description |
---|
ActiveComponent()
Constructs a new ActiveComponent with no configuration channel.
|
ActiveComponent(ChannelInput configure)
Constructs a new ActiveComponent with a configuration channel.
|
Modifier and Type | Method and Description |
---|---|
void |
addComponentEventChannel(ChannelOutput componentEvent)
Add a new channel to this component that will be used to notify that
a ComponentEvent has occurred.
|
void |
addFocusEventChannel(ChannelOutput focusEvent)
Add a new channel to this component that will be used to notify that
a FocusEvent has occurred.
|
void |
addKeyEventChannel(ChannelOutput keyEvent)
Add a new channel to this component that will be used to notify that
a KeyEvent has occurred.
|
void |
addMouseEventChannel(ChannelOutput mouseEvent)
Add a new channel to this component that will be used to notify that
a MouseEvent has occurred.
|
void |
addMouseMotionEventChannel(ChannelOutput mouseMotionEvent)
Add a new channel to this component that will be used to notify that
a MouseMotionEvent has occurred.
|
void |
run()
The main body of this process.
|
void |
setConfigureChannel(ChannelInput configure)
Sets the configuration channel for this ActiveComponent.
|
action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, addNotify, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, createVolatileImage, createVolatileImage, deliverEvent, disable, disableEvents, dispatchEvent, doLayout, enable, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getAccessibleContext, getAlignmentX, getAlignmentY, getBackground, getBaseline, getBaselineResizeBehavior, getBounds, getBounds, getColorModel, getComponentAt, getComponentAt, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeys, getFocusTraversalKeysEnabled, getFont, getFontMetrics, getForeground, getGraphics, getGraphicsConfiguration, getHeight, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getListeners, getLocale, getLocation, getLocation, getLocationOnScreen, getMaximumSize, getMinimumSize, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPeer, getPreferredSize, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getSize, getToolkit, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, invalidate, isBackgroundSet, isCursorSet, isDisplayable, isDoubleBuffered, isEnabled, isFocusable, isFocusCycleRoot, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isOpaque, isPreferredSizeSet, isShowing, isValid, isVisible, keyDown, keyUp, layout, list, list, list, list, list, locate, location, lostFocus, minimumSize, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paint, paintAll, paramString, postEvent, preferredSize, prepareImage, prepareImage, print, printAll, processComponentEvent, processEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removeNotify, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, reshape, resize, resize, revalidate, setBackground, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setEnabled, setFocusable, setFocusTraversalKeys, setFocusTraversalKeysEnabled, setFont, setForeground, setIgnoreRepaint, setLocale, setLocation, setLocation, setMaximumSize, setMinimumSize, setName, setPreferredSize, setSize, setSize, setVisible, show, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCycle, update, validate
private java.util.Vector vec
private ChannelInput configure
public ActiveComponent()
public ActiveComponent(ChannelInput configure)
configure
- the channel for configuration events
-- can be null if no configuration is required.public void setConfigureChannel(ChannelInput configure)
configure
- the channel for configuration events
-- can be null if no configuration is required.public void addComponentEventChannel(ChannelOutput componentEvent)
NOTE: This method must be called before this process is run.
componentEvent
- the channel down which ComponentEvents will be sent.public void addFocusEventChannel(ChannelOutput focusEvent)
NOTE: This method must be called before this process is run.
focusEvent
- the channel down which FocusEvents will be sent.public void addKeyEventChannel(ChannelOutput keyEvent)
NOTE: This method must be called before this process is run.
keyEvent
- the channel down which KeyEvents will be sent.public void addMouseEventChannel(ChannelOutput mouseEvent)
NOTE: This method must be called before this process is run.
mouseEvent
- the channel down which MouseEvents will be sent.public void addMouseMotionEventChannel(ChannelOutput mouseMotionEvent)
NOTE: This method must be called before this process is run.
mouseMotionEvent
- the channel down which MouseMotionEvents will be sent.