ptolemy.gui
Class BasicJApplet

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.Container
              |
              +--java.awt.Panel
                    |
                    +--java.applet.Applet
                          |
                          +--javax.swing.JApplet
                                |
                                +--ptolemy.gui.BasicJApplet

public class BasicJApplet

extends javax.swing.JApplet

Base class for swing applets. This class provides basic management for background colors, a standardized mechanism for reporting errors and exceptions, and a minimal amount of information about the applet.

Version:

$Id: BasicJApplet.java,v 1.1 1999/07/21 20:00:22 eal Exp $

Author:

Edward A. Lee

See Also:

Serialized Form

Inner classes inherited from class javax.swing.JApplet

javax.swing.JApplet.AccessibleJApplet

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

Constructor Summary

BasicJApplet()

Method Summary

protected java.lang.String[][]	_concatStringArrays(java.lang.String[][] first, java.lang.String[][] second) Concatenate two parameter info string arrays and return the result.
protected java.awt.Color	_getBackground() Get the background color as set by the "background" applet parameter.
java.lang.String	getAppletInfo() Return generic applet information.
java.lang.String[][]	getParameterInfo() Describe the applet parameters.
void	init() Initialize the applet.
void	report(java.lang.Exception ex) Report an exception.
void	report(java.lang.String message, java.lang.Exception ex) Report an exception with an additional message.

Methods inherited from class javax.swing.JApplet

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

Methods inherited from class java.applet.Applet

destroy, getAppletContext, getAudioClip, getAudioClip, getCodeBase, getDocumentBase, getImage, getImage, getLocale, getParameter, isActive, newAudioClip, play, play, resize, resize, setStub, showStatus, start, stop

Methods inherited from class java.awt.Panel

addNotify

Methods inherited from class java.awt.Container

add, add, add, add, add, addContainerListener, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getAlignmentX, getAlignmentY, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getInsets, getLayout, getMaximumSize, getMinimumSize, getPreferredSize, insets, invalidate, isAncestorOf, layout, list, list, locate, minimumSize, paint, paintComponents, preferredSize, print, printComponents, processContainerEvent, processEvent, remove, removeAll, removeContainerListener, removeNotify, setCursor, setFont, validate, validateTree

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addPropertyChangeListener, addPropertyChangeListener, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, disable, disableEvents, dispatchEvent, enable, enable, enableEvents, enableInputMethods, firePropertyChange, getBackground, getBounds, getBounds, getColorModel, getComponentOrientation, getCursor, getDropTarget, getFont, getFontMetrics, getForeground, getGraphics, getHeight, getInputContext, getInputMethodRequests, getLocation, getLocation, getLocationOnScreen, getName, getParent, getPeer, getSize, getSize, getToolkit, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, isDisplayable, isDoubleBuffered, isEnabled, isFocusTraversable, isLightweight, isOpaque, 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, processInputMethodEvent, processMouseEvent, processMouseMotionEvent, remove, removeComponentListener, removeFocusListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, reshape, setBackground, setBounds, setBounds, setComponentOrientation, setDropTarget, setEnabled, setForeground, setLocale, setLocation, setLocation, setName, setSize, setSize, setVisible, show, show, size, toString, transferFocus

Methods inherited from class java.lang.Object

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

Constructor Detail

BasicJApplet

public BasicJApplet()

Method Detail

getAppletInfo

public java.lang.String getAppletInfo()

Return generic applet information.

Overrides:

getAppletInfo in class java.applet.Applet

Returns:

A string giving minimal information about Ptolemy II.

getParameterInfo

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

Describe the applet parameters. Derived classes should override this and append their own parameters. The protected method _concatStringArrays() is provided to make this easy to do.

Overrides:

getParameterInfo in class java.applet.Applet

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 reads the background color parameter. If the background color parameter has not been set, then the background color is set to white.

Overrides:

init in class java.applet.Applet

report

public void report(java.lang.Exception ex)

Report an exception. This prints a message to the standard error stream, followed by the stack trace.

report

public void report(java.lang.String message,
                   java.lang.Exception ex)

Report an exception with an additional message. Currently this prints a message to standard error, followed by the stack trace, although soon it will pop up a message window instead.

_concatStringArrays

protected java.lang.String[][] _concatStringArrays(java.lang.String[][] first,
                                                   java.lang.String[][] second)

Concatenate two parameter info string arrays and return the result. This is provided to make it easy for derived classes to override the getParameterInfo() method. The returned array has length equal to the sums of the lengths of the two arguments, and containing the arrays contained by the arguments.

Parameters:

first - The first string array.

second - The second string array.

Returns:

A concatenated string array.

_getBackground

protected java.awt.Color _getBackground()

Get the background color as set by the "background" applet parameter. This is protected so that derived classes can find out what the background color is. Derived classes may wish to know the color so they can match it in some of their components.