appBase
Class AppBase

java.lang.Object
  java.awt.Component
      java.awt.Container
          java.awt.Panel
              java.applet.Applet
                  javax.swing.JApplet
                      appBase.AppBase

All Implemented Interfaces:

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

public abstract class AppBase
extends javax.swing.JApplet

Class AppBase is used for creating combined applets and standalone applications. This class implements two Template Methods: the applet init() method and the standalone application installApplication() method. Concrete subclasses complete the implementation by implementing the primitive operations getTitle() and createContentPane(), and overriding the hook operations createMenuBar() and the applet start() method.

The AppBase class provides implemented helper methods that can be used for constructing applets and aplications: getResourceRoot(), getFontSize(), setFontSize(), and createFontSizeAction(). The getResourceRoot() method provides access to resources such as HTML files and icons. The getFontSize() and setFontSize() methods can be used to manage font size uniformly throughout an applet or application. They should not be called in any of the abstract methods but may be called in the start() method. The createFontSizeAction() method returns an action that changes the font size. It can be installed in menus and buttons for user control of the font size.

See Also:

Serialized Form

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 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

AppBase()

Method Summary

protected abstract java.awt.Container	createContentPane() createContentPane() is a primitive operation used to create the content pane.
javax.swing.Action	createFontSizeAction(float sz) app.getFontSize() returns the font size of app.
protected javax.swing.JMenuBar	createMenuBar() createMenuBar() is a hook operation used to create the menu bar.
float	getFontSize() app.getFontSize() returns the font size of app.
VFSDirectory	getPackageDirectory()
VFSRoot	getPackageRoot()
VFSRoot	getResourceRoot(java.lang.String nm) app.getResourceRoot(nm) returns the virtual file system root for the directory named nm, relative to the class of app.
protected abstract java.lang.String	getTitle() getTitle() is a primitive operation used to set the title for a standalone application.
void	init() Applet Entry point invoked by a browser.
void	installApplication() Standalone application Entry point.
boolean	isApplet() app.isApplet() returns true if app is an applet, false if it is a standalone application.
void	setFontSize(float sz) app.setFontSize(sz) sets the font size for app to sz.

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

destroy, getAppletContext, getAppletInfo, getAudioClip, getAudioClip, getCodeBase, getDocumentBase, getImage, getImage, getLocale, getParameter, getParameterInfo, 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, 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, transferFocusBackward, 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, 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, transferFocusUpCycle

Methods inherited from class java.lang.Object

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

Constructor Detail

AppBase

public AppBase()

Method Detail

createContentPane

protected abstract java.awt.Container createContentPane()

createContentPane() is a primitive operation used to create the content pane.

Returns:

the content pane

getTitle

protected abstract java.lang.String getTitle()

getTitle() is a primitive operation used to set the title for a standalone application.

Returns:

the menu bar

createMenuBar

protected javax.swing.JMenuBar createMenuBar()

createMenuBar() is a hook operation used to create the menu bar. The default returns null, resulting in no menu bar.

Returns:

the menu bar

isApplet

public boolean isApplet()

app.isApplet() returns true if app is an applet, false if it is a standalone application.

Returns:

getResourceRoot

public VFSRoot getResourceRoot(java.lang.String nm)

app.getResourceRoot(nm) returns the virtual file system root for the directory named nm, relative to the class of app.

Returns:

getPackageRoot

public VFSRoot getPackageRoot()

getPackageDirectory

public VFSDirectory getPackageDirectory()

init

public final void init()

Applet Entry point invoked by a browser.

Overrides:

init in class java.applet.Applet

installApplication

public final void installApplication()

Standalone application Entry point.

setFontSize

public final void setFontSize(float sz)

app.setFontSize(sz) sets the font size for app to sz.

Parameters:

sz - the new font size

getFontSize

public final float getFontSize()

app.getFontSize() returns the font size of app.

Returns:

the current font size

createFontSizeAction

public final javax.swing.Action createFontSizeAction(float sz)

app.getFontSize() returns the font size of app.

Returns:

the current font size