ciips.animation
Class ImageButton

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.Button
              |
              +--ciips.animation.ImageButton

All Implemented Interfaces:

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

public class ImageButton

extends java.awt.Button

The ImageButton class extends the original java.awt.Button to display graphical images in gif format. In this particular implementation, the images to be loaded have to be located in the same directory as the code base (which can be accessed using Applet.getCodeBase()).

In order to work around the bug in some of the older java complient web browser, in particular, the class not found exception during the initilization of the frame using Netscape 2.0, this class is casted to its parent class Button and explicitly casted back to ImageButton when the customized methods are required.

See Also:

Button, Serialized Form

Inner classes inherited from class java.awt.Button

java.awt.Button.AccessibleAWTButton

Inner classes inherited from class java.awt.Component

java.awt.Component.AccessibleAWTComponent

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

ImageButton(java.lang.String imageFile, AlgAnimApp app, ControlPanel parent)
Creates an ImageButton using the gif file specified by the first parameter on the panel defined by the third parameter.

Method Summary

java.awt.Dimension	getPreferredSize() Specify the dimension of the button.
void	paint(java.awt.Graphics g) Method to draw image on the button
java.awt.Dimension	preferredSize() Specify the dimension of the button.
void	print(java.awt.Graphics g) Method to draw image on the button
void	setDisable() Disable the image button and set the current image to imageFileDisable.gif.
void	setEnable() Enable the image button and set the current image to imageFile.gif
void	update(java.awt.Graphics g) This method is invokes when the repaint method is called.

Methods inherited from class java.awt.Button

addActionListener, addNotify, getAccessibleContext, getActionCommand, getLabel, getListeners, paramString, processActionEvent, processEvent, removeActionListener, setActionCommand, setLabel

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addPropertyChangeListener, addPropertyChangeListener, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, deliverEvent, disable, disableEvents, dispatchEvent, doLayout, enable, enable, enableEvents, enableInputMethods, firePropertyChange, getAlignmentX, getAlignmentY, getBackground, getBounds, getBounds, getColorModel, getComponentAt, getComponentAt, getComponentOrientation, getCursor, getDropTarget, getFont, getFontMetrics, getForeground, getGraphics, getGraphicsConfiguration, getHeight, getInputContext, getInputMethodRequests, getLocale, getLocation, getLocation, getLocationOnScreen, getMaximumSize, getMinimumSize, getName, getParent, getPeer, getSize, getSize, getToolkit, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, invalidate, isDisplayable, isDoubleBuffered, isEnabled, isFocusTraversable, isLightweight, isOpaque, isShowing, isValid, isVisible, keyDown, keyUp, layout, list, list, list, list, list, locate, location, lostFocus, minimumSize, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, printAll, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeNotify, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, reshape, resize, resize, setBackground, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setEnabled, setFont, setForeground, setLocale, setLocation, setLocation, setName, setSize, setSize, setVisible, show, show, size, toString, transferFocus, validate

Methods inherited from class java.lang.Object

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

Constructor Detail

ImageButton

public ImageButton(java.lang.String imageFile,
                   AlgAnimApp app,
                   ControlPanel parent)

Creates an ImageButton using the gif file specified by the first parameter on the panel defined by the third parameter.

Before calling this constructor, make sure that the image file imageFile.gif exists. It is also required to have another gif image imageFileDisable.gif, which appears to be the disabled button.

Parameters:

imageFile - The gif image file without the .gif extension. The extension will be appended when calling the Applet.getImage() method.

app - An instance to an applet. The only applet in this cluster of classes, an instance of AlgAnimApp, is usually passed in here. This particular applet is used to obtain the code base, i.e. the location of the image files.

parent - The panel where this image button is going to reside. This paremeter is passed in so that the repaint method for the panel can be called when a refreshing is required.

Method Detail

getPreferredSize

public java.awt.Dimension getPreferredSize()

Specify the dimension of the button. In this particular application, images with resolution of 42x52 are used. Therefore, this method always returns Dimension with width 42 and height 52. This method is only called by the system layout manager.

Overrides:

getPreferredSize in class java.awt.Component

Returns:

The dimention of the button.

preferredSize

public java.awt.Dimension preferredSize()

Specify the dimension of the button. In this particular application, images with resolution of 42x52 are used. Therefore, this method always returns Dimension with width 42 and height 52. This method is only called by the system layout manager.

Overrides:

preferredSize in class java.awt.Component

Returns:

The dimention of the button.

setDisable

public void setDisable()

Disable the image button and set the current image to imageFileDisable.gif.

setEnable

public void setEnable()

Enable the image button and set the current image to imageFile.gif

print

public void print(java.awt.Graphics g)

Method to draw image on the button

Overrides:

print in class java.awt.Component

update

public void update(java.awt.Graphics g)

This method is invokes when the repaint method is called.

Overrides:

update in class java.awt.Component

paint

public void paint(java.awt.Graphics g)

Method to draw image on the button

Overrides:

paint in class java.awt.Component