silverstripe-framework/forms/TreeDropdownField.php

182 lines
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PHP
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<?php
/**
* Dropdown-like field that allows you to select an item from a hierachical AJAX-expandable tree
*
* @package forms
* @subpackage fields-relational
*/
class TreeDropdownField extends FormField {
public static $url_handlers = array (
'$Action!/$ID' => '$Action'
);
public static $allowed_actions = array (
'tree'
);
/**
* @ignore
*/
protected $sourceObject, $keyField, $labelField, $filterCallback, $baseID = 0;
/**
* @param string $name the field name
* @param string $title the field label
* @param string $souceClass the class to display in the tree, must have the "Hierachy" extension.
* @param string $keyField to field on the source class to save as the field value (default ID).
* @param string $labelField the field name to show as the human-readable value on the tree (default Title).
*/
public function __construct($name, $title = null, $sourceObject = 'Group', $keyField = 'ID', $labelField = 'Title') {
$this->sourceObject = $sourceObject;
$this->keyField = $keyField;
$this->labelField = $labelField;
if(!Object::has_extension($this->sourceObject, 'Hierarchy')) {
throw new Exception (
"TreeDropdownField: the source class '$this->sourceObject' must have the Hierarchy extension applied"
);
}
Requirements::add_i18n_javascript(SAPPHIRE_DIR . '/javascript/lang');
Requirements::javascript(THIRDPARTY_DIR . '/behaviour.js');
Requirements::javascript(THIRDPARTY_DIR . '/tree/tree.js');
Requirements::javascript(SAPPHIRE_DIR . '/javascript/TreeSelectorField.js');
Requirements::css(THIRDPARTY_DIR . '/tree/tree.css');
Requirements::css(SAPPHIRE_DIR . '/css/TreeDropdownField.css');
parent::__construct($name, $title);
}
/**
* Set the ID of the root node of the tree. This defaults to 0 - i.e. displays the whole tree.
*
* @param int $ID
*/
public function setTreeBaseID($ID) {
$this->baseID = (int) $ID;
}
/**
* Set a callback used to filter the values of the tree before displaying to the user.
*
* @param callback $callback
*/
public function setFilterFunction($callback) {
if(!is_callable($callback, true)) {
throw new InvalidArgumentException('TreeDropdownField->setFilterCallback(): not passed a valid callback');
}
$this->filterCallback = $callback;
}
/**
* @return string
*/
public function Field() {
if($this->Value() && $record = $this->objectForKey($this->Value())) {
$title = $record->{$this->labelField};
} else {
$title = _t('DropdownField.CHOOSE', '(Choose)', PR_MEDIUM, 'start value of a dropdown');
}
return $this->createTag (
'div',
array (
'id' => "TreeDropdownField_{$this->id()}",
'class' => 'TreeDropdownField single' . ($this->extraClass() ? " {$this->extraClass()}" : '')
),
$this->createTag (
'input',
array (
'id' => $this->id(),
'type' => 'hidden',
'name' => $this->name,
'value' => $this->value
)
) . $this->createTag (
'span',
array (
'class' => 'items'
),
$title
) . $this->createTag (
'a',
array (
'href' => '#',
'title' => 'open',
'class' => 'editLink'
),
'&nbsp;'
)
);
}
/**
* Get the whole tree of a part of the tree via an AJAX request.
*
* @param SS_HTTPRequest $request
* @return string
*/
public function tree(SS_HTTPRequest $request) {
$isSubTree = false;
if($ID = (int) $request->param('ID')) {
$obj = DataObject::get_by_id($this->sourceObject, $ID);
$isSubTree = true;
if(!$obj) {
throw new Exception (
"TreeDropdownField->tree(): the object #$ID of type $this->sourceObject could not be found"
);
}
} else {
if($this->baseID) {
$obj = DataObject::get_by_id($this->sourceObject, $this->baseID);
}
if(!$this->baseID || !$obj) $obj = singleton($this->sourceObject);
}
if($this->filterCallback) {
$obj->setMarkingFilterFunction($this->filterCallback);
} elseif($this->sourceObject == 'Folder') {
$obj->setMarkingFilter('ClassName', 'Folder');
}
$obj->markPartialTree();
if($forceValues = $this->value) {
if(($values = preg_split('/,\s*/', $forceValues)) && count($values)) foreach($values as $value) {
$obj->markToExpose($this->objectForKey($value));
}
}
$eval = '"<li id=\"selector-' . $this->Name() . '-{$child->' . $this->keyField . '}\" class=\"$child->class"' .
' . $child->markingClasses() . "\"><a rel=\"$child->ID\">" . $child->' . $this->labelField . ' . "</a>"';
if($isSubTree) {
return substr(trim($obj->getChildrenAsUL('', $eval, null, true)), 4, -5);
}
return $obj->getChildrenAsUL('class="tree"', $eval, null, true);
}
/**
* Get the object where the $keyField is equal to a certain value
*
* @param string|int $key
* @return DataObject
*/
protected function objectForKey($key) {
if($this->keyField == 'ID') {
return DataObject::get_by_id($this->sourceObject, $key);
} else {
return DataObject::get_one($this->sourceObject, "\"{$this->keyField}\" = '" . Convert::raw2sql($key) . "'");
}
}
}