grad
Class GradientCanvas

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.Canvas
              |
              +--grad.GradientCanvas

All Implemented Interfaces:

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

public class GradientCanvas

extends java.awt.Canvas

implements java.util.Observer

A subclass of Canvas that automatically maintains a gradient-painted background using a BasicGradientPainter object.

See Also:

Serialized Form

Inner classes inherited from class java.awt.Canvas

java.awt.Canvas.AccessibleAWTCanvas

Inner classes inherited from class java.awt.Component

java.awt.Component.AccessibleAWTComponent

Field Summary

protected java.awt.Color	borderColor
protected int	defaultMode
protected BasicGradientPainter	gradient
protected int	marginWidth

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

GradientCanvas(BasicGradientPainter p)
Create a GradientCanvas that renders using the given BasicGradientPainter in its default mode.

Method Summary

BasicGradientPainter	getGradient() Retreive the gradient being used as our background
void	paint(java.awt.Graphics g) Overridden version of paint() that paints the gradient into the background.
void	setGradient(BasicGradientPainter p) Set the gradient to be used as our background.
void	setMargins(int mwidth, java.awt.Color bcolor) Set up fancy-looking margins.
void	setMode(int m) Set the default gradient paint mode to be used, >= 0.
void	update(java.util.Observable g, java.lang.Object x) Each instance of GradientCanvas acts as an Observer of its own gradient, so that it can repaint when the gradient changes.

Methods inherited from class java.awt.Canvas

addNotify, getAccessibleContext

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, getListeners, getLocale, getLocation, getLocation, getLocationOnScreen, getMaximumSize, getMinimumSize, getName, getParent, getPeer, getPreferredSize, 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, paramString, postEvent, preferredSize, prepareImage, prepareImage, print, printAll, processComponentEvent, processEvent, 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, update, validate

Methods inherited from class java.lang.Object

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

Field Detail

gradient

protected BasicGradientPainter gradient

defaultMode

protected int defaultMode

marginWidth

protected int marginWidth

borderColor

protected java.awt.Color borderColor

Constructor Detail

GradientCanvas

public GradientCanvas(BasicGradientPainter p)

Create a GradientCanvas that renders using the given BasicGradientPainter in its default mode.

Method Detail

setMargins

public void setMargins(int mwidth,
                       java.awt.Color bcolor)

Set up fancy-looking margins. Use this in conjunction with setBackground(). If mwidth > 0 then a 3DRect will be traced at the edges of the canvas, with mwidth margin inside it. If bcolor is not null, then a 1-pixel line of the given color will be draw. Then, finally, the gradient will be drawn insides all of that.

setMode

public void setMode(int m)

Set the default gradient paint mode to be used, >= 0.

getGradient

public BasicGradientPainter getGradient()

Retreive the gradient being used as our background

setGradient

public void setGradient(BasicGradientPainter p)

Set the gradient to be used as our background.

paint

public void paint(java.awt.Graphics g)

Overridden version of paint() that paints the gradient into the background. Subclasses should call super.paint(g) first, before doing their own painting.

Overrides:

paint in class java.awt.Canvas

update

public void update(java.util.Observable g,
                   java.lang.Object x)

Each instance of GradientCanvas acts as an Observer of its own gradient, so that it can repaint when the gradient changes.

Specified by:

update in interface java.util.Observer