Proyectos de Subversion Moodle

<?php

// This file is part of Moodle - http://moodle.org/

//

// Moodle is free software: you can redistribute it and/or modify

// it under the terms of the GNU General Public License as published by

// the Free Software Foundation, either version 3 of the License, or

// (at your option) any later version.

//

// Moodle is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

//

// You should have received a copy of the GNU General Public License

// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

namespace core\output;

use lang_string;

/**

 * Class allowing to quick edit a title inline

 *

 * This class is used for displaying an element that can be in-place edited by the user. To display call:

 * echo $OUTPUT->render($element);

 * or

 * echo $OUTPUT->render_from_template('core/inplace_editable', $element->export_for_template($OUTPUT));

 *

 * Template core/inplace_editable will automatically load javascript module with the same name

 * core/inplace_editable. Javascript module registers a click-listener on edit link and

 * then replaces the displayed value with an input field. On "Enter" it sends a request

 * to web service core_update_inplace_editable, which invokes the callback from the component.

 * Any exception thrown by the web service (or callback) is displayed as an error popup.

 *

 * Callback {$component}_inplace_editable($itemtype, $itemid, $newvalue) must be present in the lib.php file of

 * the component or plugin. It must return instance of this class.

 *

 * @package    core

 * @category   output

 * @copyright  2016 Marina Glancy

 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

class inplace_editable implements renderable, templatable {

    /**

     * @var string component responsible for diplsying/updating

     */

    protected $component = null;

    /**

     * @var string itemtype inside the component

     */

    protected $itemtype = null;

    /**

     * @var int identifier of the editable element (usually database id)

     */

    protected $itemid = null;

    /**

     * @var string value of the editable element as it is present in the database

     */

    protected $value = null;

    /**

     * @var string value of the editable element as it should be displayed,

     * must be formatted and may contain links or other html tags

     */

    protected $displayvalue = null;

    /**

     * @var string label for the input element (for screenreaders)

     */

    protected $editlabel = null;

    /**

     * @var string hint for the input element (for screenreaders)

     */

    protected $edithint = null;

    /**

     * @var pix_icon icon to use to toggle editing

     */

    protected $editicon = null;

    /**

     * @var bool indicates if the current user is allowed to edit this element - set in constructor after permissions are checked

     */

    protected $editable = false;

    /**

     * @var string type of the element - text, toggle or select

     */

    protected $type = 'text';

    /**

     * @var string options for the element, for example new value for the toggle or json-encoded list of options for select

     */

    protected $options = '';

    /**

     * Constructor.

     *

     * @param string $component name of the component or plugin responsible for the updating of the value (must declare callback)

     * @param string $itemtype type of the item inside the component

     *                         Each component/plugin may implement multiple inplace-editable elements.

     * @param int $itemid identifier of the item that can be edited in-place

     * @param bool $editable whether this value is editable (check capabilities and editing mode), if false, only "displayvalue"

     *              will be displayed without anything else

     * @param string $displayvalue what needs to be displayed to the user, it must be cleaned, with applied filters (call

     *              {@link format_string()}). It may be wrapped in an html link, contain icons or other decorations

     * @param string $value what needs to be edited - usually raw value from the database, it may contain multilang tags

     * @param lang_string|string $edithint hint (title) that will be displayed under the edit link

     * @param lang_string|string $editlabel label for the input element in the editing mode (for screenreaders)

     * @param pix_icon|null $editicon icon to use to toggle editing

     */

    public function __construct(

        $component,

        $itemtype,

        $itemid,

        $editable,

        $displayvalue,

        $value = null,

        $edithint = null,

        $editlabel = null,

        ?pix_icon $editicon = null

    ) {

        $this->component = $component;

        $this->itemtype = $itemtype;

        $this->itemid = $itemid;

        $this->editable = $editable;

        $this->displayvalue = $displayvalue;

        $this->value = $value;

        $this->edithint = $edithint;

        $this->editlabel = $editlabel;

        $this->editicon = $editicon;

    }

    /**

     * Sets the element type to be a toggle

     *

     * For toggle element $editlabel is not used.

     * $displayvalue must be specified, it can have text or icons but can not contain html links.

     *

     * Toggle element can have two or more options.

     *

     * @param array $options toggle options as simple, non-associative array; defaults to array(0,1)

     * @return self

     */

    public function set_type_toggle($options = null) {

        if ($options === null) {

            $options = [0, 1];

        }

        $options = array_values($options);

        $idx = array_search($this->value, $options, true);

        if ($idx === false) {

            throw new \coding_exception('Specified value must be one of the toggle options');

        }

        $nextvalue = ($idx < count($options) - 1) ? $idx + 1 : 0;

        $this->type = 'toggle';

        $this->options = (string)$nextvalue;

        return $this;

    }

    /**

     * Sets the element type to be a dropdown

     *

     * For select element specifying $displayvalue is optional, if null it will

     * be assumed that $displayvalue = $options[$value].

     * However displayvalue can still be specified if it needs icons and/or

     * html links.

     *

     * If only one option specified, the element will not be editable.

     *

     * @param array $options associative array with dropdown options

     * @return self

     */

    public function set_type_select($options) {

        if (!array_key_exists($this->value, $options)) {

            throw new \coding_exception('Options for select element must contain an option for the specified value');

        }

        if (count($options) < 2) {

            $this->editable = false;

        }

        $this->type = 'select';

        $pairedoptions = [];

        foreach ($options as $key => $value) {

            $pairedoptions[] = [

                'key' => $key,

                'value' => $value,

            ];

        }

        $this->options = json_encode($pairedoptions);

        if ($this->displayvalue === null) {

            $this->displayvalue = $options[$this->value];

        }

        if ($this->editicon === null) {

            $this->editicon = new pix_icon('t/expanded', (string) $this->edithint);

        }

        return $this;

    }

    /**

     * Sets the element type to be an autocomplete field

     *

     * @param array $options associative array with dropdown options

     * @param array $attributes associative array with attributes for autoselect field. See AMD module core/form-autocomplete.

     * @return self

     */

    public function set_type_autocomplete($options, $attributes) {

        $this->type = 'autocomplete';

        $pairedoptions = [];

        foreach ($options as $key => $value) {

            $pairedoptions[] = [

                'key' => $key,

                'value' => $value,

            ];

        }

        $this->options = json_encode(['options' => $pairedoptions, 'attributes' => $attributes]);

        return $this;

    }

    /**

     * Whether the link should contain all of the content or not.

     */

    protected function get_linkeverything() {

        if ($this->type === 'toggle') {

            return true;

        }

        if (preg_match('#<a .*>.*</a>#', $this->displayvalue) === 1) {

            return false;

        }

        return true;

    }

    /**

     * Export this data so it can be used as the context for a mustache template (core/inplace_editable).

     *

     * @param \renderer_base $output typically, the renderer that's calling this function

     * @return array data context for a mustache template

     */

    public function export_for_template(\renderer_base $output) {

        if (!$this->editable) {

            return [

                'displayvalue' => (string)$this->displayvalue,

            ];

        }

        if ($this->editicon === null) {

            $this->editicon = new pix_icon('t/editstring', (string) $this->edithint);

        }

        return [

            'component' => $this->component,

            'itemtype' => $this->itemtype,

            'itemid' => $this->itemid,

            'displayvalue' => (string)$this->displayvalue,

            'value' => (string)$this->value,

            'edithint' => (string)$this->edithint,

            'editlabel' => (string)$this->editlabel,

            'editicon' => $this->editicon->export_for_pix(),

            'type' => $this->type,

            'options' => $this->options,

            'linkeverything' => $this->get_linkeverything() ? 1 : 0,

        ];

    }

    /**

     * Renders this element

     *

     * @param \renderer_base $output typically, the renderer that's calling this function

     * @return string

     */

    public function render(\renderer_base $output) {

        return $output->render_from_template('core/inplace_editable', $this->export_for_template($output));

    }

}