org.zaval.awt.gdp
Class Controller

java.lang.Object

  |

  +--org.zaval.awt.gdp.Controller

Direct Known Subclasses:

CursorController, DgnController, DragController, ShapeController

public abstract class Controller

extends java.lang.Object

This abstract class is a base for classes that want to control behaviour different java.awt.Component components. The controlled Java AWT component is defined as a target component. Use setTarget method for the purpose.

Constructor Summary

Controller(java.awt.Component target)
Constructs a new class with the specified target component.

Method Summary

java.awt.Component	getTarget() Gets the current target component.
void	setTarget(java.awt.Component c) Sets the specified target component.
protected abstract void	targetWasChanged(java.awt.Component newTarget, java.awt.Component oldTarget) The method is called whenever the target component has been changed.

Methods inherited from class java.lang.Object

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

Constructor Detail

Controller

public Controller(java.awt.Component target)

Constructs a new class with the specified target component.

Parameters:

target - the specified target component.

Method Detail

setTarget

public void setTarget(java.awt.Component c)

Sets the specified target component.

Parameters:

c - the specified target component.

getTarget

public java.awt.Component getTarget()

Gets the current target component.

Returns:

a current target component.

targetWasChanged

protected abstract void targetWasChanged(java.awt.Component newTarget,
                                         java.awt.Component oldTarget)

The method is called whenever the target component has been changed. Use the method to remove appropriate listeners for the old target instance and set a new listener set for the new target component.

Parameters:

newTarget - the specified new target component.

oldTarget - the specified old target component.