org.apache.commons.jelly.tags.swing
Class GbcTag

java.lang.Object
  org.apache.commons.jelly.TagSupport
      org.apache.commons.jelly.DynaTagSupport
          org.apache.commons.jelly.MapTagSupport
              org.apache.commons.jelly.tags.core.UseBeanTag
                  org.apache.commons.jelly.tags.swing.GbcTag

All Implemented Interfaces:

BeanSource, ContainerTag, DynaTag, Tag

public class GbcTag

extends UseBeanTag

implements ContainerTag

This class represents a GridBagConstraints constraints as passed in the second argument of Container#add(Component,Object). It supports inheritence between such tags in the following fashion:

• either using a basedOn attribute which is supposed to provide a reference to another GbcTag.
• either using a parent GbcTag.

The first version takes precedence. A Grid-bag-constraint inherits from another simply by setting other attributes as is done in GridBagConstraintBean.setBasedOn(org.apache.commons.jelly.tags.swing.impl.GridBagConstraintBean).

In essence, it looks really like nothing else than a bean-class... with getConstraints(). Probably a shorter java-source is do-able.

TODO: this class should probably be extended with special treatment for dimensions using the converter package.

Version:

$Revision: 1.2 $

Author:

Paul Libbrecht

Field Summary

Fields inherited from class org.apache.commons.jelly.TagSupport

body, context, hasTrimmed, parent, shouldTrim

Constructor Summary

GbcTag()

Method Summary

void	addChild(Component component, Object constraints) Adds a child component to this parent
protected Class	convertToClass(Object classObject) A class may be specified otherwise the Factory will be used.
static Tag	findAncestorWithClass(Tag from, Class tagClass, Tag parent)
GridBagConstraints	getConstraints()
protected Object	newInstance(Class theClass, Map attributes, XMLOutput output) A class may be specified otherwise the Factory will be used.
protected void	setBeanProperties(Object bean, Map attributes)

Methods inherited from class org.apache.commons.jelly.tags.core.UseBeanTag

doTag, getBean, getDefaultClass, loadClass, processBean, setBean

Methods inherited from class org.apache.commons.jelly.MapTagSupport

createAttributes, getAttributes, setAttribute

Methods inherited from class org.apache.commons.jelly.DynaTagSupport

getAttributeType

Methods inherited from class org.apache.commons.jelly.TagSupport

findAncestorWithClass, findAncestorWithClass, findAncestorWithClass, findAncestorWithClass, findAncestorWithClass, findAncestorWithClass, getBody, getBodyText, getBodyText, getContext, getParent, invokeBody, isTrim, setBody, setContext, setParent, setTrim, trimBody

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.commons.jelly.Tag

getBody, getContext, getParent, invokeBody, setBody, setContext, setParent

Constructor Detail

GbcTag

public GbcTag()

Method Detail

getConstraints

public GridBagConstraints getConstraints()

addChild

public void addChild(Component component,
                     Object constraints)
              throws JellyTagException

Adds a child component to this parent

Specified by:

addChild in interface ContainerTag

Parameters:

component - the child to add

constraints - the constraints to use

Throws:

JellyTagException

convertToClass

protected Class convertToClass(Object classObject)
                        throws MissingAttributeException,
                               ClassNotFoundException

A class may be specified otherwise the Factory will be used.

Parameters:

classObject - the object to be converted

Throws:

MissingAttributeException

ClassNotFoundException

newInstance

protected Object newInstance(Class theClass,
                             Map attributes,
                             XMLOutput output)
                      throws JellyTagException

A class may be specified otherwise the Factory will be used.

Throws:

JellyTagException

setBeanProperties

protected void setBeanProperties(Object bean,
                                 Map attributes)
                          throws JellyTagException

Throws:

JellyTagException

findAncestorWithClass

public static Tag findAncestorWithClass(Tag from,
                                        Class tagClass,
                                        Tag parent)