lava.gui
Class ListenableLayoutManager

java.lang.Object
  |
  +--lava.gui.ListenableLayoutManager

All Implemented Interfaces:

java.awt.LayoutManager

Direct Known Subclasses:

ListenableLayoutManager2

public class ListenableLayoutManager

extends java.lang.Object

implements java.awt.LayoutManager

Adds LayoutListener support to any LayoutManager.

Details: ListenableLayoutManager is a LayoutManager that forwards most of its work to another LayoutManager. This class adds LayoutListener support to existing LayoutManager implementations.

Since:

1999.06.09

Field Summary

protected java.awt.LayoutManager

lm Represented LayoutManager.

Constructor Summary

ListenableLayoutManager(java.awt.LayoutManager lm)
Specifies LayoutManager.

Method Summary

void	addLayoutComponent(java.lang.String s, java.awt.Component c) Forwards call to lm.
void	addLayoutListener(LayoutListener ll) Subscribes LayoutListener to laidOutContainer messages.
void	layoutContainer(java.awt.Container c) Forwards call to lm.
java.awt.Dimension	minimumLayoutSize(java.awt.Container c) Forwards call to lm.
protected void	notifyListeners(java.awt.Container c) Sends laidOutContainer messages to registered LayoutListeners.
java.awt.Dimension	preferredLayoutSize(java.awt.Container c) Forwards call to lm.
void	removeLayoutComponent(java.awt.Component c) Forwards call to lm.
void	removeLayoutListener(LayoutListener ll) Unsubscribes LayoutListener to laidOutContainer messages.

Methods inherited from class java.lang.Object

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

Field Detail

lm

protected final java.awt.LayoutManager lm

Represented LayoutManager.

Details: lm is the real LayoutManager for which I am acting as a proxy. I forward most of my layout work to lm. This value is defined at construction time.

Constructor Detail

ListenableLayoutManager

public ListenableLayoutManager(java.awt.LayoutManager lm)

Specifies LayoutManager.

Details: This constructor prepares me to act as a proxy for the given LayoutManager.

Parameters:

lm - the LayoutManager

Method Detail

addLayoutListener

public void addLayoutListener(LayoutListener ll)

Subscribes LayoutListener to laidOutContainer messages.

Details: addLayoutListener adds ll, a LayoutListener, to my list of registered LayoutListeners. If ll is already registered, this does nothing.

Parameters:

ll - the interested LayoutListener

removeLayoutListener

public void removeLayoutListener(LayoutListener ll)

Unsubscribes LayoutListener to laidOutContainer messages.

Details: removeLayoutListener removes ll, a LayoutListener, from my list of registered LayoutListeners. No action is taken if ll is not registered.

Parameters:

ll - the uninterested LayoutListener

notifyListeners

protected void notifyListeners(java.awt.Container c)

Sends laidOutContainer messages to registered LayoutListeners.

Details: notifyListeners calls laidOutContainer(c) for all registered LayoutListeners.

Parameters:

c - passed to laidOutContainer

layoutContainer

public void layoutContainer(java.awt.Container c)

Forwards call to lm.

Details: I forward layoutContainer calls to lm, and then call notifyListeners(c) on each of the registered LayoutListeners to let them know that I just laid out a Container.

Specified by:

layoutContainer in interface java.awt.LayoutManager

Parameters:

c - the Container

removeLayoutComponent

public void removeLayoutComponent(java.awt.Component c)

Forwards call to lm.

Details: I forward removeLayoutComponent calls to lm.

Specified by:

removeLayoutComponent in interface java.awt.LayoutManager

Parameters:

c - a forwarded parameter

addLayoutComponent

public void addLayoutComponent(java.lang.String s,
                               java.awt.Component c)

Forwards call to lm.

Details: I forward addLayoutComponent calls to lm.

Specified by:

addLayoutComponent in interface java.awt.LayoutManager

Parameters:

s - a forwarded parameter

c - a forwarded parameter

preferredLayoutSize

public java.awt.Dimension preferredLayoutSize(java.awt.Container c)

Forwards call to lm.

Details: I forward preferredLayoutSize calls to lm and return the result.

Specified by:

preferredLayoutSize in interface java.awt.LayoutManager

Parameters:

c - a forwarded parameter

Returns:

the result

minimumLayoutSize

public java.awt.Dimension minimumLayoutSize(java.awt.Container c)

Forwards call to lm.

Details: I forward minimumLayoutSize calls to lm and return the result.

Specified by:

minimumLayoutSize in interface java.awt.LayoutManager

Parameters:

c - a forwarded parameter

Returns:

the result