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<?php
/**
* Dropdown-like field that allows you to select an item from a hierarchical
* AJAX-expandable tree.
*
* Creates a field which opens a dropdown (actually a div via javascript
* included for you) which contains a tree with the ability to select a singular
* item for the value of the field. This field has the ability to store one-to-one
* joins related to hierarchy or a hierarchy based filter.
*
* **Note:** your source object must use an implementation of hierarchy for this
* field to generate the tree correctly, e.g. {@link Group}, {@link SiteTree} etc.
*
* All operations are carried out through javascript and provides no fallback
* to non JS.
*
* <b>Usage</b>.
*
* <code>
* static $has_one = array(
* 'RightContent' => 'SiteTree'
* );
*
* function getCMSFields() {
* ...
* $treedropdownfield = new TreeDropdownField("RightContentID", "Choose a page to show on the right:", "SiteTree");
* ..
* }
* </code>
*
* This will generate a tree allowing the user to expand and contract subsections
* to find the appropriate page to save to the field.
*
* @see {@link TreeMultiselectField} for the same implementation allowing multiple selections
* @see {@link DropdownField} for a simple dropdown field.
* @see {@link CheckboxSetField} for multiple selections through checkboxes.
* @see {@link OptionsetField} for single selections via radiobuttons.
*
* @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, $searchCallback, $baseID = 0;
/**
* Used by field search to leave only the relevant entries
*/
protected $searchIds = null, $showSearch, $searchExpanded = array();
/**
* CAVEAT: for search to work properly $labelField must be a database field,
* or you need to setSearchFunction.
*
* @param string $name the field name
* @param string $title the field label
* @param sourceObject The object-type to list in the tree. Must be a
* {@link Hierarchy} subclass. Alternatively, you can set this to an
* array of key/value pairs, like a {@link DropdownField} source. In
* this case, the field will act like show a flat list of tree items,
* without any hierarchy. This is most useful in conjunction with
* {@link TreeMultiselectField}, for presenting a set of checkboxes in
* a compact view.
*
* @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).
* @param bool $showSearch enable the ability to search the tree by
* entering the text in the input field.
*/
public function __construct($name, $title = null, $sourceObject = 'Group', $keyField = 'ID', $labelField = 'Title', $showSearch = false) {
$this->sourceObject = $sourceObject;
$this->keyField = $keyField;
$this->labelField = $labelField;
$this->showSearch = $showSearch;
parent::__construct($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;
}
/**
* Set a callback used to search the hierarchy globally, even before
* applying the filter.
*
* @param callback $callback
*/
public function setSearchFunction($callback) {
if(!is_callable($callback, true)) {
throw new InvalidArgumentException('TreeDropdownField->setSearchFunction(): not passed a valid callback');
}
$this->searchCallback = $callback;
}
public function getShowSearch() {
return $this->showSearch;
}
/**
* @return string
*/
public function Field($properties = array()) {
Requirements::add_i18n_javascript(SAPPHIRE_DIR . '/javascript/lang');
Requirements::javascript(SAPPHIRE_DIR . '/thirdparty/jquery/jquery.js');
Requirements::javascript(SAPPHIRE_DIR . '/javascript/jquery_improvements.js');
Requirements::javascript(SAPPHIRE_DIR . '/thirdparty/jquery-entwine/dist/jquery.entwine-dist.js');
Requirements::javascript(SAPPHIRE_DIR . '/thirdparty/jstree/jquery.jstree.js');
Requirements::javascript(SAPPHIRE_DIR . '/javascript/TreeDropdownField.js');
Requirements::css(SAPPHIRE_DIR . '/thirdparty/jquery-ui-themes/smoothness/jquery-ui.css');
Requirements::css(SAPPHIRE_DIR . '/css/TreeDropdownField.css');
$record = $this->Value() ? $this->objectForKey($this->Value()) : null;
if($record) {
$title = $record->{$this->labelField};
} else {
$title = _t('DropdownField.CHOOSE', '(Choose)', PR_MEDIUM, 'start value of a dropdown');
}
// TODO Implement for TreeMultiSelectField
$metadata = array(
'id' => $record ? $record->ID : null,
'ClassName' => $record ? $record->ClassName : $this->sourceObject
);
$properties = array_merge(
$properties,
array(
'Title' => $title,
'Metadata' => ($metadata) ? Convert::raw2att(Convert::raw2json($metadata)) : null
)
);
return $this->customise($properties)->renderWith('TreeDropdownField');
}
function extraClass() {
return implode(' ', array(parent::extraClass(), ($this->showSearch ? "searchable" : null)));
}
/**
* 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 $request) {
// Array sourceObject is an explicit list of values - construct a "flat tree"
if(is_array($this->sourceObject)) {
$output = "<ul class=\"tree\">\n";
foreach($this->sourceObject as $k => $v) {
$output .= '<li id="selector-' . $this->name . '-' . $k . '"><a>' . $v . '</a>';
}
$output .= "</ul>";
return $output;
}
// Regular source specification
$isSubTree = false;
$this->search = Convert::Raw2SQL($request->requestVar('search'));
$ID = (is_numeric($request->latestparam('ID'))) ? (int)$request->latestparam('ID') : (int)$request->requestVar('ID');
if($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);
}
// pre-process the tree - search needs to operate globally, not locally as marking filter does
if ( $this->search != "" )
$this->populateIDs();
if ($this->filterCallback || $this->sourceObject == 'Folder' || $this->search != "" )
$obj->setMarkingFilterFunction(array($this, "filterMarking"));
$obj->markPartialTree();
// allow to pass values to be selected within the ajax request
if( isset($_REQUEST['forceValue']) || $this->value ) {
$forceValue = ( isset($_REQUEST['forceValue']) ? $_REQUEST['forceValue'] : $this->value);
if(($values = preg_split('/,\s*/', $forceValue)) && count($values)) foreach($values as $value) {
if(!$value) continue;
$obj->markToExpose($this->objectForKey($value));
}
}
$eval = '"<li id=\"selector-' . $this->getName() . '-{$child->' . $this->keyField . '}\" data-id=\"$child->' . $this->keyField . '\" class=\"class-$child->class"' .
' . $child->markingClasses() . "\"><a rel=\"$child->ID\">" . $child->' . $this->labelField . ' . "</a>"';
if($isSubTree) {
return substr(trim($obj->getChildrenAsUL('', $eval, null, true)), 4, -5);
} else {
return $obj->getChildrenAsUL('class="tree"', $eval, null, true);
}
}
/**
* Marking function for the tree, which combines different filters sensibly. If a filter function has been set,
* that will be called. If the source is a folder, automatically filter folder. And if search text is set, filter on that
* too. Return true if all applicable conditions are true, false otherwise.
* @param $node
* @return unknown_type
*/
function filterMarking($node) {
if ($this->filterCallback && !call_user_func($this->filterCallback, $node)) return false;
if ($this->sourceObject == "Folder" && $node->ClassName != 'Folder') return false;
if ($this->search != "") {
return isset($this->searchIds[$node->ID]) && $this->searchIds[$node->ID] ? true : false;
}
return true;
}
/**
* Populate $this->searchIds with the IDs of the pages matching the searched parameter and their parents.
* Reverse-constructs the tree starting from the leaves. Initially taken from CMSSiteTreeFilter, but modified
* with pluggable search function.
*/
protected function populateIDs() {
// get all the leaves to be displayed
if ( $this->searchCallback )
$res = call_user_func($this->searchCallback, $this->sourceObject, $this->labelField, $this->search);
else
$res = DataObject::get($this->sourceObject, "\"$this->labelField\" LIKE '%$this->search%'");
if( $res ) {
// iteratively fetch the parents in bulk, until all the leaves can be accessed using the tree control
foreach($res as $row) {
if ($row->ParentID) $parents[$row->ParentID] = true;
$this->searchIds[$row->ID] = true;
}
while (!empty($parents)) {
$res = DB::query('SELECT "ParentID", "ID" FROM "' . $this->sourceObject . '" WHERE "ID" in ('.implode(',',array_keys($parents)).')');
$parents = array();
foreach($res as $row) {
if ($row['ParentID']) $parents[$row['ParentID']] = true;
$this->searchIds[$row['ID']] = true;
$this->searchExpanded[$row['ID']] = 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) . "'");
}
}
/**
* Changes this field to the readonly field.
*/
function performReadonlyTransformation() {
return new TreeDropdownField_Readonly($this->name, $this->title, $this->sourceObject, $this->keyField, $this->labelField);
}
}
/**
* @package forms
* @subpackage fields-relational
*/
class TreeDropdownField_Readonly extends TreeDropdownField {
protected $readonly = true;
function Field() {
$fieldName = $this->labelField;
if($this->value) {
$keyObj = $this->objectForKey($this->value);
$obj = $keyObj ? $keyObj->$fieldName : '';
} else {
$obj = null;
}
$source = array(
$this->value => $obj
);
$field = new LookupField($this->name, $this->title, $source);
$field->setValue($this->value);
$field->setForm($this->form);
return $field->Field();
}
}
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