54 lines
2.1 KiB
PHP
54 lines
2.1 KiB
PHP
<?php
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/**
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* This class represents "transformations" of a form - such as making it printable or making it readonly.
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* The idea is that sometimes you will want to make your own such transformations, and you shouldn't have
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* to edit the underlying code to support this.
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*
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* The first step in creating a transformation is subclassing FormTransformation. After that, you have two
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* ways of defining specific functionality:
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* - Define performMyTransformation() methods on each applicable FormField() object.
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* - Define transformFieldType($field) methods on your subclass of FormTransformation.
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*
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* To actually perform the transformation, call $form->transform(new MyTransformation());
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* @package forms
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* @subpackage transformations
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*/
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class FormTransformation extends Object {
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public function transform(FormField $field) {
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// Look for a performXXTransformation() method on the field itself.
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// performReadonlyTransformation() is a pretty commonly applied method.
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// Otherwise, look for a transformXXXField() method on this object.
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// This is more commonly done in custom transformations
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// We iterate through each array simultaneously, looking at [0] of both, then [1] of both.
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// This provides a more natural failover scheme.
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$transNames = array_reverse(array_values(ClassInfo::ancestry($this->class)));
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$fieldClasses = array_reverse(array_values(ClassInfo::ancestry($field->class)));
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$len = max(sizeof($transNames), sizeof($fieldClasses));
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for($i=0;$i<$len;$i++) {
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// This is lets fieldClasses be longer than transNames
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if($transName = $transNames[$i]) {
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if($field->hasMethod('perform' . $transName)) {
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$funcName = 'perform' . $transName;
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//echo "<li>$field->class used $funcName";
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return $field->$funcName($this);
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}
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}
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// And this one does the reverse.
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if($fieldClass = $fieldClasses[$i]) {
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if($this->hasMethod('transform' . $fieldClass)) {
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$funcName = 'transform' . $fieldClass;
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//echo "<li>$field->class used $funcName";
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return $this->$funcName($field);
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}
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}
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}
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user_error("FormTransformation:: Can't perform '$this->class' on '$field->class'", E_USER_ERROR);
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}
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}
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