ptolemy.actor.gui

Class PtolemyApplet

java.lang.Object

java.awt.Component

java.awt.Container

java.awt.Panel

java.applet.Applet

javax.swing.JApplet

ptolemy.gui.BasicJApplet

ptolemy.actor.gui.PtolemyApplet

All Implemented Interfaces:

java.awt.image.ImageObserver, java.awt.MenuContainer, java.io.Serializable, javax.accessibility.Accessible, javax.swing.RootPaneContainer, ExecutionListener

Direct Known Subclasses:

MoMLApplet

public class PtolemyApplet
extends BasicJApplet
implements ExecutionListener

This class provides a convenient way to make applets out of Ptolemy II models. It assumes that the model is defined as a Java class that extends NamedObj, with the classname given by the modelClass applet parameter. If that model does not contain a manager, then this class will create one for it.

This class offers a number of alternatives that control the visual appearance of the applet. By default, the applet places on the screen a set of control buttons that can be used to start, stop, pause, and resume the model. Below those buttons, it places the visual elements of any actors in the model that implement the Placeable interface, such as plotters or textual output.

The applet parameters are:

• background: The background color, typically given as a hex number of the form "#rrggbb" where rr gives the red component, gg gives the green component, and bb gives the blue component.
• controls: This gives a comma-separated list of any subset of the words "buttons", "topParameters", and "directorParameters" (case insensitive), or the word "none". If this parameter is not given, then it is equivalent to giving "buttons", and only the control buttons mentioned above will be displayed. If the parameter is given, and its value is "none", then no controls are placed on the screen. If the word "topParameters" is included in the comma-separated list, then controls for the top-level parameters of the model are placed on the screen, below the buttons. If the word "directorParameters" is included, then controls for the director parameters are also included.
• modelClass: The fully qualified class name of a Java class that extends NamedObj. This class defines the model.
• orientation: This can have value "horizontal", "vertical", or "controls_only" (case insensitive). If it is "vertical", then the controls are placed above the visual elements of the Placeable actors. This is the default. If it is "horizontal", then the controls are placed to the left of the visual elements. If it is "controls_only" then no visual elements are placed.
• autoRun: This can have value "true", or "false". If it is "true", then the model will be run when the applet's start() method is called. If false, then the model will not be run automatically. The default is "true".

To create a model in a different way, say without a modelClass applet parameter, you may extend this class and override the protected method _createModel(). If you wish to alter the way that the model is represented on the screen, you can extend this class an override the _createView() method. The rendition in this class is an instance of ModelPane.

This class provides a number of methods that might be useful even if its init() or _createModel() methods are not appropriate for a given applet. Specifically, it provides a mechanism for reporting errors and exceptions; and it provide an applet parameter for controlling the background color.

Since:

Ptolemy II 0.3

Author:

Edward A. Lee

See Also:

ModelPane, Placeable, Serialized Form

Pt.AcceptedRating:

Yellow (johnr)

Pt.ProposedRating:

Green (eal)

Nested Class Summary

Nested classes/interfaces inherited from class javax.swing.JApplet

javax.swing.JApplet.AccessibleJApplet

Nested classes/interfaces inherited from class java.applet.Applet

java.applet.Applet.AccessibleApplet

Nested classes/interfaces inherited from class java.awt.Panel

java.awt.Panel.AccessibleAWTPanel

Nested classes/interfaces inherited from class java.awt.Container

java.awt.Container.AccessibleAWTContainer

Nested classes/interfaces inherited from class java.awt.Component

java.awt.Component.AccessibleAWTComponent, java.awt.Component.BaselineResizeBehavior, java.awt.Component.BltBufferStrategy, java.awt.Component.FlipBufferStrategy

Field Summary

Fields

Modifier and Type	Field and Description
protected Manager	_manager The manager, created in the init() method.
protected boolean	_setupOK Set this to false if the setup of the model during the init() method fails.
protected NamedObj	_toplevel The top-level composite actor, created in the init() method.
protected Workspace	_workspace The workspace that the applet is built in.

Fields inherited from class ptolemy.gui.BasicJApplet

_background

Fields inherited from class javax.swing.JApplet

accessibleContext, rootPane, rootPaneCheckingEnabled

Fields inherited from class java.awt.Component

BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

Fields inherited from interface java.awt.image.ImageObserver

ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH

Constructor Summary

Constructors

Constructor and Description
PtolemyApplet()

Method Summary

Modifier and Type	Method and Description
protected NamedObj	_createModel(Workspace workspace) Create a model.
protected javax.swing.JPanel	_createRunControls(int numberOfButtons) Deprecated. Use the control applet parameter.
protected void	_createView() Create a ModelPane to control execution of the model and display its results.
protected void	_go() Execute the model, if the manager is not currently executing.
protected void	_stop() Stop the execution.
void	destroy() Cleanup after execution of the model.
void	executionError(Manager manager, java.lang.Throwable throwable) Report that an execute error occurred.
void	executionFinished(Manager manager) Report that execution of the model has finished.
java.lang.String	getAppletInfo() Return a string describing this applet.
java.lang.String[][]	getParameterInfo() Describe the applet parameters.
void	init() Initialize the applet.
void	managerStateChanged(Manager manager) Report that the manager state has changed.
void	start() Start execution of the model.
void	stop() Stop execution of the model.

Methods inherited from class ptolemy.gui.BasicJApplet

_concatStringArrays, _getBackground, _stackTraceToString, report, report, report

Methods inherited from class javax.swing.JApplet

addImpl, createRootPane, getAccessibleContext, getContentPane, getGlassPane, getGraphics, getJMenuBar, getLayeredPane, getRootPane, getTransferHandler, isRootPaneCheckingEnabled, paramString, remove, repaint, setContentPane, setGlassPane, setJMenuBar, setLayeredPane, setLayout, setRootPane, setRootPaneCheckingEnabled, setTransferHandler, update

Methods inherited from class java.applet.Applet

getAppletContext, getAudioClip, getAudioClip, getCodeBase, getDocumentBase, getImage, getImage, getLocale, getParameter, isActive, isValidateRoot, newAudioClip, play, play, resize, resize, setStub, showStatus

Methods inherited from class java.awt.Panel

addNotify

Methods inherited from class java.awt.Container

add, add, add, add, add, addContainerListener, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getAlignmentX, getAlignmentY, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getComponentZOrder, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getInsets, getLayout, getListeners, getMaximumSize, getMinimumSize, getMousePosition, getPreferredSize, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paint, paintComponents, preferredSize, print, printComponents, processContainerEvent, processEvent, remove, removeAll, removeContainerListener, removeNotify, setComponentZOrder, setFocusCycleRoot, setFocusTraversalKeys, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setFont, transferFocusDownCycle, validate, validateTree

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, createVolatileImage, createVolatileImage, disable, disableEvents, dispatchEvent, enable, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getBackground, getBaseline, getBaselineResizeBehavior, getBounds, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getFontMetrics, getForeground, getGraphicsConfiguration, getHeight, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocation, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPeer, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getSize, getToolkit, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isDoubleBuffered, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isOpaque, isPreferredSizeSet, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, printAll, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, reshape, revalidate, setBackground, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setEnabled, setFocusable, setFocusTraversalKeysEnabled, setForeground, setIgnoreRepaint, setLocale, setLocation, setLocation, setMaximumSize, setMinimumSize, setName, setPreferredSize, setSize, setSize, setVisible, show, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCycle

Methods inherited from class java.lang.Object

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

Field Detail

_manager

protected Manager _manager

The manager, created in the init() method.

_setupOK

protected boolean _setupOK

Set this to false if the setup of the model during the init() method fails. This prevents the model from executing.

_toplevel

protected NamedObj _toplevel

The top-level composite actor, created in the init() method.

_workspace

protected Workspace _workspace

The workspace that the applet is built in. Each applet has it own workspace.

Constructor Detail

PtolemyApplet

public PtolemyApplet()

Method Detail

destroy

public void destroy()

Cleanup after execution of the model. This method is called by the browser or appletviewer to inform this applet that it should clean up.

Overrides:

destroy in class java.applet.Applet

executionError

public void executionError(Manager manager,
                           java.lang.Throwable throwable)

Report that an execute error occurred. This is called by the manager.

Specified by:

executionError in interface ExecutionListener

Parameters:

manager - The manager in charge of the execution.

throwable - The throwable that triggered the error.

executionFinished

public void executionFinished(Manager manager)

Report that execution of the model has finished. This is called by the manager.

Specified by:

executionFinished in interface ExecutionListener

Parameters:

manager - The manager in charge of the execution.

getAppletInfo

public java.lang.String getAppletInfo()

Return a string describing this applet.

Overrides:

getAppletInfo in class BasicJApplet

Returns:

A string describing the applet.

getParameterInfo

public java.lang.String[][] getParameterInfo()

Describe the applet parameters.

Overrides:

getParameterInfo in class BasicJApplet

Returns:

An array describing the applet parameters.

init

public void init()

Initialize the applet. This method is called by the browser or applet viewer to inform this applet that it has been loaded into the system. It is always called before the first time that the start() method is called. In this base class, this method creates a new workspace, and instantiates in it the model whose class name is given by the modelClass applet parameter. If that model does not contain a manager, then this method creates one for it.

Overrides:

init in class BasicJApplet

managerStateChanged

public void managerStateChanged(Manager manager)

Report that the manager state has changed. This is called by the manager.

Specified by:

managerStateChanged in interface ExecutionListener

Parameters:

manager - The manager controlling the execution.

See Also:

Manager.getState()

start

public void start()

Start execution of the model. This method is called by the browser or applet viewer to inform this applet that it should start its execution. It is called after the init method and each time the applet is revisited in a Web page. In this base class, this method calls the protected method _go(), which executes the model, unless the noAutoRun parameter has been set. If a derived class does not wish to execute the model each time start() is called, it should override this method with a blank method.

Overrides:

start in class java.applet.Applet

stop

public void stop()

Stop execution of the model. This method is called by the browser or applet viewer to inform this applet that it should stop its execution. It is called when the Web page that contains this applet has been replaced by another page, and also just before the applet is to be destroyed. In this base class, this method calls the stop() method of the manager. If there is no manager, do nothing.

Overrides:

stop in class java.applet.Applet

_createModel

protected NamedObj _createModel(Workspace workspace)
                         throws java.lang.Exception

Create a model. In this base class, we check to see whether the applet has a parameter modelClass, and if so, then we instantiate the class specified in that parameter. If not, then we create an empty instance of NamedObj. It is required that the class specified in the modelClass parameter have a constructor that takes one argument, an instance of Workspace. In either case, if the resulting model does not have a manager, then we give it a manager.

Parameters:

workspace - The workspace in which to create the model.

Returns:

A model.

Throws:

java.lang.Exception - If something goes wrong. This is a broad exception to allow derived classes wide latitude as to which exception to throw.

_createRunControls

@Deprecated
protected javax.swing.JPanel _createRunControls(int numberOfButtons)

Deprecated. Use the control applet parameter.

Create run controls in a panel and return that panel. The argument controls how many buttons are created. If its value is greater than zero, then a "Go" button created. If its value is greater than one, then a "Stop" button is also created. Derived classes may override this method to add additional controls, or to create a panel with a different layout.

Parameters:

numberOfButtons - How many buttons to create.

Returns:

The run control panel.

_createView

protected void _createView()

Create a ModelPane to control execution of the model and display its results. Derived classes may override this to do something different.

_go

protected void _go()
            throws IllegalActionException

Execute the model, if the manager is not currently executing. Note that this method is not called if there are button controls on the screen and the user pushes the "Go" button.

Throws:

IllegalActionException - Not thrown in this base class.

_stop

protected void _stop()

Stop the execution.