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<?php |
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namespace SilverStripe\Forms; |
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use BadMethodCallException; |
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use SilverStripe\Core\ClassInfo; |
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use SilverStripe\Core\Config\Configurable; |
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use SilverStripe\Core\Extensible; |
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use SilverStripe\Core\Injector\Injectable; |
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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 $form->transform(new MyTransformation()); |
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*/ |
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class FormTransformation |
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{ |
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use Configurable; |
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use Injectable; |
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use Extensible; |
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public function __construct() |
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{ |
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$this->constructExtensions(); |
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} |
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public function transform(FormField $field) |
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{ |
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// Look for a performXXTransformation() method on the field itself. |
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// performReadonlyTransformation() is a pretty commonly applied method. |
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// Otherwise, look for a transformXXXField() method on this object. |
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// This is more commonly done in custom transformations |
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// We iterate through each array simultaneously, looking at [0] of both, then [1] of both. |
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// This provides a more natural failover scheme. |
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$transNames = array_reverse(array_map( |
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function ($name) { |
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return ClassInfo::shortName($name); |
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}, |
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array_values(ClassInfo::ancestry($this)) |
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)); |
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$fieldClasses = array_reverse(array_map( |
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function ($name) { |
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return ClassInfo::shortName($name); |
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}, |
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array_values(ClassInfo::ancestry($field)) |
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)); |
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$len = max(sizeof($transNames), sizeof($fieldClasses)); |
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for ($i=0; $i<$len; $i++) { |
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// This is lets fieldClasses be longer than transNames |
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if (!empty($transNames[$i])) { |
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$funcName = 'perform' . $transNames[$i]; |
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if ($field->hasMethod($funcName)) { |
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//echo "<li>$field->class used $funcName"; |
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return $field->$funcName($this); |
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} |
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} |
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// And this one does the reverse. |
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if (!empty($fieldClasses[$i])) { |
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$funcName = 'transform' . $fieldClasses[$i]; |
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if ($this->hasMethod($funcName)) { |
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//echo "<li>$field->class used $funcName"; |
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return $this->$funcName($field); |
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} |
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} |
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} |
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$class = static::class; |
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$fieldClass = get_class($field); |
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throw new BadMethodCallException("FormTransformation:: Can't perform '{$class}' on '{$fieldClass}'"); |
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} |
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} |
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silverstripe /
silverstripe-framework
