jcsp.awt
Class GraphicsProtocol

java.lang.Object
  |
  +--jcsp.lang.TaggedProtocol
        |
        +--jcsp.awt.GraphicsProtocol

Direct Known Subclasses:

GraphicsProtocol.General, GraphicsProtocol.MakeMISImage, GraphicsProtocol.SetBackground, GraphicsProtocol.SetPaintable

public abstract class GraphicsProtocol

extends TaggedProtocol

This is the tagged protocol for use over the toGraphics configuration channel of an active graphics component.

Description

GraphicsProtocol is the tagged protocol for use over the toGraphics configuration channel of an active graphics component (for example, see ActiveCanvas.setGraphicsChannels).

It is a collection of static immutable enquiry/configuration objects and static configuration classes. An enquiry sent down the toGraphics channel generates an appropriate reply on the fromGraphics channel. A configuration class may be used to construct an immutable configuration object that may be sent down the toGraphics channel to configure some property of the graphics component. A configuration message is always acknowledged with a Boolean.TRUE returned on the fromGraphics channel (once the configuration has happened).

Author:

P.H.Welch

See Also:

ActiveCanvas, TaggedProtocol

Inner Class Summary

static interface	GraphicsProtocol.Configure This is the interface for general configuration of the graphics component.
static class	GraphicsProtocol.General This is a general configuration class for the graphics component.
static class	GraphicsProtocol.MakeMISImage This is a configuration class to associate a java.awt.image.MemoryImageSource with the graphics component.
static class	GraphicsProtocol.SetBackground This is a configuration class for setting the background java.awt.Color of the active graphics component.
static class	GraphicsProtocol.SetPaintable This is a configuration class to register a jcsp.awt.Paintable object with the graphics component.

Field Summary

static GraphicsProtocol	GET_BACKGROUND This is an enquiry object to find the background colour of the active graphics component.
static GraphicsProtocol	GET_COMPONENT This is an enquiry object to obtain the active graphics component.
static GraphicsProtocol	GET_DIMENSION This is an enquiry object to find the size of the active graphics component.
static GraphicsProtocol	REQUEST_FOCUS This is a configuration object to request input focus on the graphics component for keyboard and mouse evnts.

Fields inherited from class jcsp.lang.TaggedProtocol

tag

Methods inherited from class java.lang.Object

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

Field Detail

GET_DIMENSION

public static final GraphicsProtocol GET_DIMENSION

This is an enquiry object to find the size of the active graphics component. The java.awt.Dimension will be returned down the fromGraphics channel.

GET_COMPONENT

public static final GraphicsProtocol GET_COMPONENT

This is an enquiry object to obtain the active graphics component. The java.awt.Component will be returned down the fromGraphics channel.

GET_BACKGROUND

public static final GraphicsProtocol GET_BACKGROUND

This is an enquiry object to find the background colour of the active graphics component. The background java.awt.Color will be returned down the fromGraphics channel.

REQUEST_FOCUS

public static final GraphicsProtocol REQUEST_FOCUS

This is a configuration object to request input focus on the graphics component for keyboard and mouse evnts. A Boolean.TRUE will be returned down the fromGraphics channel.