org.freehep.postscript.viewer
Class BufferedApplet

java.lang.Object
  java.awt.Component
      java.awt.Container
          java.awt.Panel
              java.applet.Applet
                  org.freehep.postscript.viewer.BufferedApplet

All Implemented Interfaces:

ImageObserver, MenuContainer, Serializable, Accessible

Direct Known Subclasses:

PSApplet

public abstract class BufferedApplet
extends Applet
implements Serializable

This class extends JApplet by adding double buffering. This is intended to be used in situations in which redrawing the contents of the panel is expensive.

Author:

Mark Donszelmann

See Also:

Serialized Form

Nested Class Summary

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

Applet.AccessibleApplet

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

Panel.AccessibleAWTPanel

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

Container.AccessibleAWTContainer

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

Component.AccessibleAWTComponent, Component.BaselineResizeBehavior, Component.BltBufferStrategy, Component.FlipBufferStrategy

Field Summary

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

BufferedApplet()

Method Summary

Graphics	getOffscreenGraphics() Returns a pointer to the graphics (Graphics) context of the buffer.
void	invalidate() Triggers a full repaint, since the component is not valid anymore (size change, iconized, ...)
boolean	isDisplaying() Returns true if the drawing is made for a Graphics context, the display.
boolean	isPrinting() Returns true if the drawing is made for a PrinterGraphics context.
void	paint(Graphics g) Paint this panel by calling paintComponent(Graphics) if necessary and flushing the buffered image to the screen.
void	repaint() Triggers a full "user" repaint.
abstract void	repaintComponent(Graphics graphics) Really repaint the component
void	setBounds(int x, int y, int w, int h) Resize and move a component.

Methods inherited from class java.applet.Applet

destroy, getAccessibleContext, getAppletContext, getAppletInfo, getAudioClip, getAudioClip, getCodeBase, getDocumentBase, getImage, getImage, getLocale, getParameter, getParameterInfo, init, 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, addImpl, 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, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paintComponents, paramString, preferredSize, print, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, removeNotify, setComponentZOrder, setFocusCycleRoot, setFocusTraversalKeys, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setFont, setLayout, transferFocusBackward, transferFocusDownCycle, update, 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, getGraphics, 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, 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

BufferedApplet

public BufferedApplet()

Method Detail

repaint

public void repaint()

Triggers a full "user" repaint. If the "system" wants to repaint it will call the paint(Graphics) method directly, rather than scheduling a paint(Graphics) through a repaint().

Overrides:

repaint in class Component

invalidate

public void invalidate()

Triggers a full repaint, since the component is not valid anymore (size change, iconized, ...)

Overrides:

invalidate in class Container

paint

public void paint(Graphics g)

Paint this panel by calling paintComponent(Graphics) if necessary and flushing the buffered image to the screen. This method also handles printing and exporting separately.

Overrides:

paint in class Container

Parameters:

g - Graphics object

repaintComponent

public abstract void repaintComponent(Graphics graphics)

Really repaint the component

Parameters:

graphics -

getOffscreenGraphics

public Graphics getOffscreenGraphics()

Returns a pointer to the graphics (Graphics) context of the buffer. The user is NOT allowed to call dispose() on this graphics object.

NOTE: this method used to be called getGraphics, however, since the JVM paint thread may call getGraphics from paintImmediately and fails to work with our VectorGraphics context (the gc is not longer attached to the image), we decided to rename the method.

setBounds

public void setBounds(int x,
                      int y,
                      int w,
                      int h)

Resize and move a component.

Overrides:

setBounds in class Component

isPrinting

public boolean isPrinting()

Returns true if the drawing is made for a PrinterGraphics context.

isDisplaying

public boolean isDisplaying()

Returns true if the drawing is made for a Graphics context, the display. True if not Printing.