mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-10-22 14:05:37 +02:00
347 lines
11 KiB
PHP
347 lines
11 KiB
PHP
<?php
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/**
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* Dropdown-like field that allows you to select an item from a hierarchical
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* AJAX-expandable tree.
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*
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* Creates a field which opens a dropdown (actually a div via javascript
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* included for you) which contains a tree with the ability to select a singular
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* item for the value of the field. This field has the ability to store one-to-one
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* joins related to hierarchy or a hierarchy based filter.
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*
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* **Note:** your source object must use an implementation of hierarchy for this
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* field to generate the tree correctly, e.g. {@link Group}, {@link SiteTree} etc.
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*
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* All operations are carried out through javascript and provides no fallback
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* to non JS.
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*
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* <b>Usage</b>.
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*
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* <code>
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* static $has_one = array(
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* 'RightContent' => 'SiteTree'
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* );
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*
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* function getCMSFields() {
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* ...
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* $treedropdownfield = new TreeDropdownField("RightContentID", "Choose a page to show on the right:", "SiteTree");
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* ..
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* }
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* </code>
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*
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* This will generate a tree allowing the user to expand and contract subsections
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* to find the appropriate page to save to the field.
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*
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* @see {@link TreeMultiselectField} for the same implementation allowing multiple selections
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* @see {@link DropdownField} for a simple dropdown field.
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* @see {@link CheckboxSetField} for multiple selections through checkboxes.
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* @see {@link OptionsetField} for single selections via radiobuttons.
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*
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* @package forms
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* @subpackage fields-relational
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*/
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class TreeDropdownField extends FormField {
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public static $url_handlers = array(
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'$Action!/$ID' => '$Action'
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);
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public static $allowed_actions = array(
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'tree'
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);
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/**
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* @ignore
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*/
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protected $sourceObject, $keyField, $labelField, $filterCallback, $searchCallback, $baseID = 0;
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/**
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* Used by field search to leave only the relevant entries
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*/
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protected $searchIds = null, $showSearch, $searchExpanded = array();
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/**
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* CAVEAT: for search to work properly $labelField must be a database field,
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* or you need to setSearchFunction.
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*
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* @param string $name the field name
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* @param string $title the field label
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* @param sourceObject The object-type to list in the tree. Must be a
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* {@link Hierarchy} subclass. Alternatively, you can set this to an
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* array of key/value pairs, like a {@link DropdownField} source. In
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* this case, the field will act like show a flat list of tree items,
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* without any hierarchy. This is most useful in conjunction with
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* {@link TreeMultiselectField}, for presenting a set of checkboxes in
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* a compact view.
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*
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* @param string $keyField to field on the source class to save as the
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* field value (default ID).
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* @param string $labelField the field name to show as the human-readable
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* value on the tree (default Title).
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* @param bool $showSearch enable the ability to search the tree by
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* entering the text in the input field.
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*/
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public function __construct($name, $title = null, $sourceObject = 'Group', $keyField = 'ID', $labelField = 'Title', $showSearch = false) {
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$this->sourceObject = $sourceObject;
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$this->keyField = $keyField;
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$this->labelField = $labelField;
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$this->showSearch = $showSearch;
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parent::__construct($name, $title);
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}
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/**
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* Set the ID of the root node of the tree. This defaults to 0 - i.e.
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* displays the whole tree.
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*
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* @param int $ID
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*/
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public function setTreeBaseID($ID) {
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$this->baseID = (int) $ID;
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}
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/**
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* Set a callback used to filter the values of the tree before
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* displaying to the user.
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*
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* @param callback $callback
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*/
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public function setFilterFunction($callback) {
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if(!is_callable($callback, true)) {
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throw new InvalidArgumentException('TreeDropdownField->setFilterCallback(): not passed a valid callback');
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}
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$this->filterCallback = $callback;
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}
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/**
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* Set a callback used to search the hierarchy globally, even before
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* applying the filter.
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*
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* @param callback $callback
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*/
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public function setSearchFunction($callback) {
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if(!is_callable($callback, true)) {
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throw new InvalidArgumentException('TreeDropdownField->setSearchFunction(): not passed a valid callback');
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}
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$this->searchCallback = $callback;
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}
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/**
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* @return string
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*/
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public function Field() {
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Requirements::add_i18n_javascript(SAPPHIRE_DIR . '/javascript/lang');
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Requirements::javascript(SAPPHIRE_DIR . '/thirdparty/jquery/jquery.js');
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Requirements::javascript(SAPPHIRE_DIR . '/javascript/jquery_improvements.js');
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Requirements::javascript(SAPPHIRE_DIR . '/thirdparty/jquery-entwine/dist/jquery.entwine-dist.js');
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Requirements::javascript(SAPPHIRE_DIR . '/thirdparty/jstree/jquery.jstree.js');
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Requirements::javascript(SAPPHIRE_DIR . '/javascript/TreeDropdownField.js');
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Requirements::css(SAPPHIRE_DIR . '/thirdparty/jquery-ui-themes/smoothness/jquery-ui.css');
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Requirements::css(SAPPHIRE_DIR . '/css/TreeDropdownField.css');
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$record = $this->Value() ? $this->objectForKey($this->Value()) : null;
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if($record) {
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$title = $record->{$this->labelField};
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} else {
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$title = _t('DropdownField.CHOOSE', '(Choose)', PR_MEDIUM, 'start value of a dropdown');
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}
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// TODO Implement for TreeMultiSelectField
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if($record) {
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$metadata = array('id' => $record->ID, 'metadata' => array('ClassName' => $record->ClassName));
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} else {
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$metadata = null;
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}
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return $this->createTag(
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'div',
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array (
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'id' => "TreeDropdownField_{$this->id()}",
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'class' => 'TreeDropdownField single' . ($this->extraClass() ? " {$this->extraClass()}" : '') . ($this->showSearch ? " searchable" : ''),
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'data-url-tree' => $this->form ? $this->Link('tree') : "",
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'data-title' => $title,
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// Any additional data from the selected record
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'data-metadata' => ($metadata) ? Convert::raw2json($metadata) : null
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),
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$this->createTag(
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'input',
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array (
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'id' => $this->id(),
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'type' => 'hidden',
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'class' => 'text' . ($this->extraClass() ? $this->extraClass() : ''),
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'name' => $this->name,
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'value' => $this->value
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)
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)
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);
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}
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/**
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* Get the whole tree of a part of the tree via an AJAX request.
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*
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* @param SS_HTTPRequest $request
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* @return string
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*/
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public function tree(SS_HTTPRequest $request) {
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// Array sourceObject is an explicit list of values - construct a "flat tree"
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if(is_array($this->sourceObject)) {
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$output = "<ul class=\"tree\">\n";
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foreach($this->sourceObject as $k => $v) {
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$output .= '<li id="selector-' . $this->name . '-' . $k . '"><a>' . $v . '</a>';
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}
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$output .= "</ul>";
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return $output;
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}
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// Regular source specification
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$isSubTree = false;
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$this->search = Convert::Raw2SQL($request->requestVar('search'));
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$ID = (is_numeric($request->latestparam('ID'))) ? (int)$request->latestparam('ID') : (int)$request->requestVar('ID');
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if($ID) {
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$obj = DataObject::get_by_id($this->sourceObject, $ID);
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$isSubTree = true;
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if(!$obj) {
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throw new Exception (
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"TreeDropdownField->tree(): the object #$ID of type $this->sourceObject could not be found"
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);
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}
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} else {
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if($this->baseID) {
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$obj = DataObject::get_by_id($this->sourceObject, $this->baseID);
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}
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if(!$this->baseID || !$obj) $obj = singleton($this->sourceObject);
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}
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// pre-process the tree - search needs to operate globally, not locally as marking filter does
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if ( $this->search != "" )
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$this->populateIDs();
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if ($this->filterCallback || $this->sourceObject == 'Folder' || $this->search != "" )
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$obj->setMarkingFilterFunction(array($this, "filterMarking"));
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$obj->markPartialTree();
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// allow to pass values to be selected within the ajax request
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if( isset($_REQUEST['forceValue']) || $this->value ) {
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$forceValue = ( isset($_REQUEST['forceValue']) ? $_REQUEST['forceValue'] : $this->value);
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if(($values = preg_split('/,\s*/', $forceValue)) && count($values)) foreach($values as $value) {
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if(!$value) continue;
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$obj->markToExpose($this->objectForKey($value));
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}
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}
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$eval = '"<li id=\"selector-' . $this->getName() . '-{$child->' . $this->keyField . '}\" data-id=\"$child->' . $this->keyField . '\" class=\"class-$child->class"' .
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' . $child->markingClasses() . "\"><a rel=\"$child->ID\">" . $child->' . $this->labelField . ' . "</a>"';
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if($isSubTree) {
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return substr(trim($obj->getChildrenAsUL('', $eval, null, true)), 4, -5);
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} else {
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return $obj->getChildrenAsUL('class="tree"', $eval, null, true);
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}
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}
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/**
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* Marking function for the tree, which combines different filters sensibly. If a filter function has been set,
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* that will be called. If the source is a folder, automatically filter folder. And if search text is set, filter on that
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* too. Return true if all applicable conditions are true, false otherwise.
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* @param $node
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* @return unknown_type
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*/
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function filterMarking($node) {
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if ($this->filterCallback && !call_user_func($this->filterCallback, $node)) return false;
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if ($this->sourceObject == "Folder" && $node->ClassName != 'Folder') return false;
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if ($this->search != "") {
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return isset($this->searchIds[$node->ID]) && $this->searchIds[$node->ID] ? true : false;
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}
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return true;
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}
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/**
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* Populate $this->searchIds with the IDs of the pages matching the searched parameter and their parents.
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* Reverse-constructs the tree starting from the leaves. Initially taken from CMSSiteTreeFilter, but modified
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* with pluggable search function.
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*/
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protected function populateIDs() {
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// get all the leaves to be displayed
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if ( $this->searchCallback )
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$res = call_user_func($this->searchCallback, $this->sourceObject, $this->labelField, $this->search);
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else
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$res = DataObject::get($this->sourceObject, "\"$this->labelField\" LIKE '%$this->search%'");
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if( $res ) {
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// iteratively fetch the parents in bulk, until all the leaves can be accessed using the tree control
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foreach($res as $row) {
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if ($row->ParentID) $parents[$row->ParentID] = true;
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$this->searchIds[$row->ID] = true;
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}
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while (!empty($parents)) {
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$res = DB::query('SELECT "ParentID", "ID" FROM "' . $this->sourceObject . '" WHERE "ID" in ('.implode(',',array_keys($parents)).')');
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$parents = array();
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foreach($res as $row) {
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if ($row['ParentID']) $parents[$row['ParentID']] = true;
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$this->searchIds[$row['ID']] = true;
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$this->searchExpanded[$row['ID']] = true;
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}
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}
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}
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}
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/**
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* Get the object where the $keyField is equal to a certain value
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*
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* @param string|int $key
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* @return DataObject
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*/
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protected function objectForKey($key) {
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if($this->keyField == 'ID') {
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return DataObject::get_by_id($this->sourceObject, $key);
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} else {
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return DataObject::get_one($this->sourceObject, "\"{$this->keyField}\" = '" . Convert::raw2sql($key) . "'");
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}
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}
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/**
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* Changes this field to the readonly field.
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*/
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function performReadonlyTransformation() {
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return new TreeDropdownField_Readonly($this->name, $this->title, $this->sourceObject, $this->keyField, $this->labelField);
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}
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}
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/**
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* @package forms
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* @subpackage fields-relational
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*/
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class TreeDropdownField_Readonly extends TreeDropdownField {
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protected $readonly = true;
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function Field() {
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$fieldName = $this->labelField;
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if($this->value) {
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$keyObj = $this->objectForKey($this->value);
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$obj = $keyObj ? $keyObj->$fieldName : '';
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} else {
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$obj = null;
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}
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$source = array(
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$this->value => $obj
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);
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$field = new LookupField($this->name, $this->title, $source);
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$field->setValue($this->value);
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$field->setForm($this->form);
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return $field->Field();
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}
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} |