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556 lines
16 KiB
PHP
556 lines
16 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 TreeMultiselectField for the same implementation allowing multiple selections
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* @see DropdownField for a simple dropdown field.
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* @see CheckboxSetField for multiple selections through checkboxes.
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* @see 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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private static $url_handlers = array(
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'$Action!/$ID' => '$Action'
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);
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private 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, $filterCallback,
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$disableCallback, $searchCallback, $baseID = 0;
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/**
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* @var string default child method in Hierarchy->getChildrenAsUL
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*/
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protected $childrenMethod = 'AllChildrenIncludingDeleted';
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/**
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* @var string default child counting method in Hierarchy->getChildrenAsUL
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*/
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protected $numChildrenMethod = 'numChildren';
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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 string|array $sourceObject The object-type to list in the tree. This could
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* be one of the following:
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* - A DataObject class name with the {@link Hierarchy} extension.
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* - An 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. Note, that all value strings must be XML encoded
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* safely prior to being passed in.
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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', $keyField = 'ID',
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$labelField = 'TreeTitle', $showSearch = true
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) {
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$this->sourceObject = $sourceObject;
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$this->keyField = $keyField;
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$this->labelField = $labelField;
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$this->showSearch = $showSearch;
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//Extra settings for Folders
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if ($sourceObject == 'Folder') {
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$this->childrenMethod = 'ChildFolders';
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$this->numChildrenMethod = 'numChildFolders';
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}
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$this->addExtraClass('single');
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parent::__construct($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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return $this;
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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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return $this;
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}
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/**
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* Set a callback used to disable checkboxes for some items in the tree
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*
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* @param callback $callback
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*/
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public function setDisableFunction($callback) {
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if(!is_callable($callback, true)) {
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throw new InvalidArgumentException('TreeDropdownField->setDisableFunction(): not passed a valid callback');
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}
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$this->disableCallback = $callback;
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return $this;
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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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return $this;
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}
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public function getShowSearch() {
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return $this->showSearch;
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}
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/**
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* @param Boolean
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*/
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public function setShowSearch($bool) {
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$this->showSearch = $bool;
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return $this;
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}
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/**
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* @param $method The parameter to ChildrenMethod to use when calling Hierarchy->getChildrenAsUL in
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* {@link Hierarchy}. The method specified determines the structure of the returned list. Use "ChildFolders"
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* in place of the default to get a drop-down listing with only folders, i.e. not including the child elements in
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* the currently selected folder. setNumChildrenMethod() should be used as well for proper functioning.
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*
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* See {@link Hierarchy} for a complete list of possible methods.
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*/
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public function setChildrenMethod($method) {
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$this->childrenMethod = $method;
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return $this;
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}
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/**
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* @param $method The parameter to numChildrenMethod to use when calling Hierarchy->getChildrenAsUL in
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* {@link Hierarchy}. Should be used in conjunction with setChildrenMethod().
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*
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*/
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public function setNumChildrenMethod($method) {
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$this->numChildrenMethod = $method;
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return $this;
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}
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/**
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* @return string
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*/
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public function Field($properties = array()) {
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Requirements::add_i18n_javascript(FRAMEWORK_DIR . '/javascript/lang');
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Requirements::javascript(FRAMEWORK_DIR . '/thirdparty/jquery/jquery.js');
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Requirements::javascript(FRAMEWORK_DIR . '/thirdparty/jquery-entwine/dist/jquery.entwine-dist.js');
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Requirements::javascript(FRAMEWORK_DIR . '/thirdparty/jstree/jquery.jstree.js');
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Requirements::javascript(FRAMEWORK_DIR . '/javascript/TreeDropdownField.js');
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Requirements::css(FRAMEWORK_DIR . '/thirdparty/jquery-ui-themes/smoothness/jquery-ui.css');
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Requirements::css(FRAMEWORK_DIR . '/css/TreeDropdownField.css');
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$record = $this->Value() ? $this->objectForKey($this->Value()) : null;
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if($record instanceof ViewableData) {
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$title = $record->obj($this->labelField)->forTemplate();
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} elseif($record) {
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$title = Convert::raw2xml($record->{$this->labelField});
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} else if($this->showSearch) {
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$title = _t('DropdownField.CHOOSESEARCH', '(Choose or Search)', 'start value of a dropdown');
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} else {
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$title = _t('DropdownField.CHOOSE', '(Choose)', 'start value of a dropdown');
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}
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// TODO Implement for TreeMultiSelectField
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$metadata = array(
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'id' => $record ? $record->ID : null,
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'ClassName' => $record ? $record->ClassName : $this->sourceObject
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);
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$properties = array_merge(
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$properties,
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array(
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'Title' => $title,
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'Metadata' => ($metadata) ? Convert::raw2json($metadata) : null,
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)
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);
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return $this->customise($properties)->renderWith('TreeDropdownField');
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}
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public function extraClass() {
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return implode(' ', array(parent::extraClass(), ($this->showSearch ? "searchable" : null)));
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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')))
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? (int)$request->latestparam('ID')
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: (int)$request->requestVar('ID');
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if($ID && !$request->requestVar('forceFullTree')) {
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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 || $this->search != "" )
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$obj->setMarkingFilterFunction(array($this, "filterMarking"));
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$obj->markPartialTree($nodeCountThreshold = 30, $context = null,
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$this->childrenMethod, $this->numChildrenMethod);
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// allow to pass values to be selected within the ajax request
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if( isset($_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 || $value == 'unchanged') continue;
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$obj->markToExpose($this->objectForKey($value));
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}
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}
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$self = $this;
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$titleFn = function(&$child) use(&$self) {
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$keyField = $self->keyField;
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$labelField = $self->labelField;
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return sprintf(
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'<li id="selector-%s-%s" data-id="%s" class="class-%s %s %s"><a rel="%d">%s</a>',
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Convert::raw2xml($self->getName()),
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Convert::raw2xml($child->$keyField),
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Convert::raw2xml($child->$keyField),
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Convert::raw2xml($child->class),
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Convert::raw2xml($child->markingClasses($self->numChildrenMethod)),
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($self->nodeIsDisabled($child)) ? 'disabled' : '',
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(int)$child->ID,
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$child->obj($labelField)->forTemplate()
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);
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};
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// Limit the amount of nodes shown for performance reasons.
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// Skip the check if we're filtering the tree, since its not clear how many children will
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// match the filter criteria until they're queried (and matched up with previously marked nodes).
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$nodeThresholdLeaf = Config::inst()->get('Hierarchy', 'node_threshold_leaf');
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if($nodeThresholdLeaf && !$this->filterCallback && !$this->search) {
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$className = $this->sourceObject;
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$nodeCountCallback = function($parent, $numChildren) use($className, $nodeThresholdLeaf) {
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if($className == 'SiteTree' && $parent->ID && $numChildren > $nodeThresholdLeaf) {
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return sprintf(
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'<ul><li><span class="item">%s</span></li></ul>',
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_t('LeftAndMain.TooManyPages', 'Too many pages')
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);
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}
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};
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} else {
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$nodeCountCallback = null;
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}
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if($isSubTree) {
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$html = $obj->getChildrenAsUL(
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"",
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$titleFn,
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null,
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true,
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$this->childrenMethod,
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$this->numChildrenMethod,
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true, // root call
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null,
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$nodeCountCallback
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);
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return substr(trim($html), 4, -5);
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} else {
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$html = $obj->getChildrenAsUL(
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'class="tree"',
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$titleFn,
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null,
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true,
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$this->childrenMethod,
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$this->numChildrenMethod,
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true, // root call
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null,
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$nodeCountCallback
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);
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return $html;
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}
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}
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/**
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* Marking public function for the tree, which combines different filters sensibly.
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* If a filter function has been set, that will be called. And if search text is set,
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* filter on that too. Return true if all applicable conditions are true, false otherwise.
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* @param $node
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* @return unknown_type
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*/
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public function filterMarking($node) {
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if ($this->filterCallback && !call_user_func($this->filterCallback, $node)) return false;
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if ($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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* Marking a specific node in the tree as disabled
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* @param $node
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* @return boolean
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*/
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public function nodeIsDisabled($node) {
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return ($this->disableCallback && call_user_func($this->disableCallback, $node));
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}
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/**
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* @param String $field
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*/
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public function setLabelField($field) {
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$this->labelField = $field;
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return $this;
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}
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/**
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* @return String
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*/
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public function getLabelField() {
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return $this->labelField;
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}
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/**
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* @param String $field
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*/
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public function setKeyField($field) {
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$this->keyField = $field;
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return $this;
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}
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/**
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* @return String
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*/
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public function getKeyField() {
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return $this->keyField;
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}
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/**
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* @param String $field
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*/
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public function setSourceObject($class) {
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$this->sourceObject = $class;
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return $this;
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}
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/**
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* @return String
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*/
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public function getSourceObject() {
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return $this->sourceObject;
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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, $this->search);
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} else {
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$sourceObject = $this->sourceObject;
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$filters = array();
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if(singleton($sourceObject)->hasDatabaseField($this->labelField)) {
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$filters["{$this->labelField}:PartialMatch"] = $this->search;
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} else {
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if(singleton($sourceObject)->hasDatabaseField('Title')) {
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$filters["Title:PartialMatch"] = $this->search;
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}
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if(singleton($sourceObject)->hasDatabaseField('Name')) {
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$filters["Name:PartialMatch"] = $this->search;
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}
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}
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if(empty($filters)) {
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throw new InvalidArgumentException(sprintf(
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'Cannot query by %s.%s, not a valid database column',
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$sourceObject,
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$this->labelField
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));
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}
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$res = DataObject::get($this->sourceObject)->filterAny($filters);
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}
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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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$sourceObject = $this->sourceObject;
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while (!empty($parents)) {
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$items = $sourceObject::get()
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->filter("ID",array_keys($parents));
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$parents = array();
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foreach($items as $item) {
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if ($item->ParentID) $parents[$item->ParentID] = true;
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$this->searchIds[$item->ID] = true;
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$this->searchExpanded[$item->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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public function performReadonlyTransformation() {
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$copy = $this->castedCopy('TreeDropdownField_Readonly');
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$copy->setKeyField($this->keyField);
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$copy->setLabelField($this->labelField);
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$copy->setSourceObject($this->sourceObject);
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return $copy;
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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 $readonly = true;
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public function Field($properties = array()) {
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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($this->form);
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$field->dontEscape = true;
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return $field->Field();
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}
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}
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