Add convertElementTo()

[schst]

Add a new method, that enables you to convert an element to a different type, e.g. converting a Enum to a Set.

[schst]

See here for the initial request:

​http://forum.php-tools.net/index.php?t=msg&th=462

[sfuchs]

How should this be implemented?

I could think of a static method patForms_Element::convertElement($element, $type), that

• simply creates a new element using the new type,
• sets all attributes and properties from the old to the new element and
• returns the new one

Does that make sense?

[schst]

Would be nice to be able to call it on a form:

$form->addElement("foo", $aEnum);
$form->convertElement("foo", "Set");

Nevertheless, a static method would be nice to have as well.

[sfuchs]

This is now implemented in [265].

However #172 needs to be implemented to convert an Element_Enum to Element_Set without loosing the value.

Please also have a look at the unit test source:trunk/tests/element/Convert.php ... most likely there are some special cases that I've missed.