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<?php
/**
* Base class for all fields that contain other fields.
* Implements sequentialisation - so that when we're saving / loading data, we can populate
* a tabbed form properly. All of the children are stored in $this->children
* @package forms
* @subpackage fields-structural
*/
class CompositeField extends FormField {

/**
* @var FieldSet
*/
protected $children;

/**
* Set to true when this field is a readonly field
*/
protected $readonly;

/**
* @var $columnCount int Toggle different css-rendering for multiple columns
* ("onecolumn", "twocolumns", "threecolumns"). The content is determined
* by the $children-array, so wrap all items you want to have grouped in a
* column inside a CompositeField.
* Caution: Please make sure that this variable actually matches the
* count of your $children.
*/
protected $columnCount = null;

public function __construct($children = null) {
if($children instanceof FieldSet) {
$this->children = $children;
} elseif(is_array($children)) {
$this->children = new FieldSet($children);
} else {
$children = is_array(func_get_args()) ? func_get_args() : array();
$this->children = new FieldSet($children);
}
$this->children->setContainerField($this);

// Skipping FormField::__construct(), but we have to make sure this
// doesn't count as a broken constructor
$this->brokenOnConstruct = false;
Object::__construct();
}

/**
* Returns all the sub-fields, suitable for <% control FieldSet %>
*/
public function FieldSet() {
return $this->children;
}

public function setID($id) {
$this->id = $id;
}

public function Field() {
return $this->FieldHolder();
}

/**
* Accessor method for $this->children
* @return FieldSet
*/
public function getChildren() {
return $this->children;
}

/**
* @param FieldSet $children
*/
public function setChildren($children) {
$this->children = $children;
}

/**
* Returns the fields nested inside another DIV
*/
function FieldHolder() {
$fs = $this->FieldSet();
$idAtt = isset($this->id) ? " id=\"{$this->id}\"" : '';
$className = ($this->columnCount) ? "field CompositeField {$this->extraClass()} multicolumn" : "field CompositeField {$this->extraClass()}";
$content = "<div class=\"$className\"$idAtt>\n";

foreach($fs as $subfield) {
if($this->columnCount) {
$className = "column{$this->columnCount}";
if(!next($fs)) $className .= " lastcolumn";
$content .= "\n<div class=\"{$className}\">\n" . $subfield->FieldHolder() . "\n</div>\n";
} else if($subfield){
$content .= "\n" . $subfield->FieldHolder() . "\n";
}
}
$content .= "</div>\n";

return $content;
}

/**
* Returns the fields in the restricted field holder inside a DIV.
*/
function SmallFieldHolder() {//return $this->FieldHolder();
$fs = $this->FieldSet();
$idAtt = isset($this->id) ? " id=\"{$this->id}\"" : '';
$className = ($this->columnCount) ? "field CompositeField {$this->extraClass()} multicolumn" : "field CompositeField {$this->extraClass()}";
$content = "<div class=\"$className\"$idAtt>";

foreach($fs as $subfield) {//echo ' subf'.$subfield->Name();
if($this->columnCount) {
$className = "column{$this->columnCount}";
if(!next($fs)) $className .= " lastcolumn";
$content .= "<div class=\"{$className}\">" . $subfield->FieldHolder() . "</div>";
} else if($subfield){
$content .= $subfield->SmallFieldHolder() . " ";
}
}
$content .= "</div>";

return $content;
}
/**
* Add all of the non-composite fields contained within this field to the list.
* Sequentialisation is used when connecting the form to its data source
*/
public function collateDataFields(&$list, $saveableOnly = false) {
foreach($this->children as $field) {
if(is_object($field)) {
if($field->isComposite()) $field->collateDataFields($list, $saveableOnly);
if($saveableOnly) {
$isIncluded = ($field->hasData() && !$field->isReadonly() && !$field->isDisabled());
} else {
$isIncluded = ($field->hasData());
}
if($isIncluded) {
$name = $field->Name();
if($name) {
$formName = (isset($this->form)) ? $this->form->FormName() : '(unknown form)';
if(isset($list[$name])) user_error("collateDataFields() I noticed that a field called '$name' appears twice in your form: '{$formName}'. One is a '{$field->class}' and the other is a '{$list[$name]->class}'", E_USER_ERROR);
$list[$name] = $field;
}
}
}
}
}

function setForm($form) {
foreach($this->children as $f) if(is_object($f)) $f->setForm($form);
parent::setForm($form);
}

function setColumnCount($columnCount) {
$this->columnCount = $columnCount;
}

function isComposite() { return true; }
function hasData() { return false; }

public function fieldByName($name) {
return $this->children->fieldByName($name);
}
/**
* Add a new child field to the end of the set.
*/
public function push(FormField $field) {
$this->children->push($field);
}

/**
* @uses FieldSet->insertBefore()
*/
public function insertBefore($field, $insertBefore) {
$ret = $this->children->insertBefore($field, $insertBefore);
$this->sequentialSet = null;
return $ret;
}

public function insertAfter($field, $insertAfter) {
$ret = $this->children->insertAfter($field, $insertAfter);
$this->sequentialSet = null;
return $ret;
}

/**
* Remove a field from this CompositeField by Name.
* The field could also be inside a CompositeField.
*
* @param string $fieldName The name of the field
* @param boolean $dataFieldOnly If this is true, then a field will only
* be removed if it's a data field. Dataless fields, such as tabs, will
* be left as-is.
*/
public function removeByName($fieldName, $dataFieldOnly = false) {
$this->children->removeByName($fieldName, $dataFieldOnly);
}

public function replaceField($fieldName, $newField) {
return $this->children->replaceField($fieldName, $newField);
}

function rootFieldSet() {
if(is_object($this->containerFieldSet)) return $this->containerFieldSet->rootFieldSet();
else return $this->children;
}

/**
* Return a readonly version of this field. Keeps the composition but returns readonly
* versions of all the children
*/
public function performReadonlyTransformation() {
$newChildren = new FieldSet();
$clone = clone $this;
foreach($clone->getChildren() as $idx => $child) {
if(is_object($child)) $child = $child->transform(new ReadonlyTransformation());
$newChildren->push($child, $idx);
}

$clone->children = $newChildren;
$clone->readonly = true;
return $clone;
}

/**
* Return a readonly version of this field. Keeps the composition but returns readonly
* versions of all the children
*/
public function performDisabledTransformation($trans) {
$newChildren = new FieldSet();
$clone = clone $this;
if($clone->getChildren()) foreach($clone->getChildren() as $idx => $child) {
if(is_object($child)) {
$child = $child->transform($trans);
}
$newChildren->push($child, $idx);
}

$clone->children = $newChildren;
$clone->readonly = true;

return $clone;
}

function IsReadonly() {
return $this->readonly;
}

/**
* Find the numerical position of a field within
* the children collection. Doesn't work recursively.
*
* @param string|FormField
* @return Position in children collection (first position starts with 0). Returns FALSE if the field can't be found.
*/
function fieldPosition($field) {
if(is_string($field)) $field = $this->fieldByName($field);
if(!$field) return false;

$i = 0;
foreach($this->children as $child) {
if($child->Name() == $field->Name()) return $i;
$i++;
}

return false;
}

/**
* Transform the named field into a readonly feld.
*
* @param string|FormField
*/
function makeFieldReadonly($field) {
$fieldName = ($field instanceof FormField) ? $field->Name() : $field;

// Iterate on items, looking for the applicable field
foreach($this->children as $i => $item) {
if($item->isComposite()) {
$item->makeFieldReadonly($fieldName);
} else {
// Once it's found, use FormField::transform to turn the field into a readonly version of itself.
if($item->Name() == $fieldName) {
$this->children->replaceField($fieldName, $item->transform(new ReadonlyTransformation()));

// Clear an internal cache
$this->sequentialSet = null;

// A true results indicates that the field was foudn
return true;
}
}
}
return false;
}

function debug() {
$result = "$this->class ($this->name) <ul>";
foreach($this->children as $child) {
$result .= "<li>" . Debug::text($child) . "&nbsp;</li>";
}
$result .= "</ul>";
return $result;
}

function validate($validator){

$valid = true;
foreach($this->children as $idx => $child){
$valid = ($child && $child->validate($validator) && $valid);
}

return $valid;
}
}

?>
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