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/**
 * A type of dialogue used as for choosing options.
 *
 * @module moodle-core-chooserdialogue
 */

/**
 * A type of dialogue used as for choosing options.
 *
 * @constructor
 * @class M.core.chooserdialogue
 */
var CHOOSERDIALOGUE = function() {
    CHOOSERDIALOGUE.superclass.constructor.apply(this, arguments);
};

Y.extend(CHOOSERDIALOGUE, Y.Base, {
    // The panel widget
    panel: null,

// The submit button - we disable this until an element is set
    submitbutton: null,

// The chooserdialogue container
    container: null,

// Any event listeners we may need to cancel later
    listenevents: [],

bodycontent: null,
    headercontent: null,
    instanceconfig: null,

// The hidden field storing the disabled element values for submission.
    hiddenRadioValue: null,

setup_chooser_dialogue: function(bodycontent, headercontent, config) {
        this.bodycontent = bodycontent;
        this.headercontent = headercontent;
        this.instanceconfig = config;
    },

prepare_chooser: function() {
        if (this.panel) {
            return;
        }

// Ensure that we're showing the JS version of the chooser.
        Y.one(Y.config.doc.body).addClass('jschooser');

// Set Default options
        var paramkey,
            params = {
                bodyContent: this.bodycontent.get('innerHTML'),
                headerContent: this.headercontent.get('innerHTML'),
                width: '540px',
                draggable: true,
                visible: false, // Hide by default
                zindex: 100, // Display in front of other items
                modal: true, // This dialogue should be modal.
                shim: true,
                closeButtonTitle: this.get('closeButtonTitle'),
                focusOnPreviousTargetAfterHide: true,
                render: false,
                extraClasses: this._getClassNames()
            };

// Override with additional options
        for (paramkey in this.instanceconfig) {
          params[paramkey] = this.instanceconfig[paramkey];
        }

// Create the panel
        this.panel = new M.core.dialogue(params);

// Remove the template for the chooser
        this.bodycontent.remove();
        this.headercontent.remove();

// Hide and then render the panel
        this.panel.hide();
        this.panel.render();

// Set useful links.
        this.container = this.panel.get('boundingBox').one('.choosercontainer');
        this.options = this.container.all('.option input[type=radio]');

// The hidden form element we use when submitting.
        this.hiddenRadioValue = Y.Node.create('<input type="hidden" value="" />');
        this.container.one('form').appendChild(this.hiddenRadioValue);

// Add the chooserdialogue class to the container for styling
        this.panel.get('boundingBox').addClass('chooserdialogue');
    },

/**
      * Display the module chooser
      *
      * @method display_chooser
      * @param {EventFacade} e Triggering Event
      */
    display_chooser: function(e) {
        var bb, dialogue, thisevent;
        this.prepare_chooser();

// Stop the default event actions before we proceed
        e.preventDefault();

bb = this.panel.get('boundingBox');
        dialogue = this.container.one('.alloptions');

// This will detect a change in orientation and retrigger centering
        thisevent = Y.one('document').on('orientationchange', function() {
            this.center_dialogue(dialogue);
        }, this);
        this.listenevents.push(thisevent);

// Detect window resizes (most browsers)
        thisevent = Y.one('window').on('resize', function() {
            this.center_dialogue(dialogue);
        }, this);
        this.listenevents.push(thisevent);

// These will trigger a check_options call to display the correct help
        thisevent = this.container.on('click', this.check_options, this);
        this.listenevents.push(thisevent);
        thisevent = this.container.on('key_up', this.check_options, this);
        this.listenevents.push(thisevent);
        thisevent = this.container.on('dblclick', function(e) {
            if (e.target.ancestor('div.option')) {
                this.check_options();

// Prevent duplicate submissions
                this.submitbutton.setAttribute('disabled', 'disabled');
                this.options.setAttribute('disabled', 'disabled');
                this.cancel_listenevents();

this.container.one('form').submit();
            }
        }, this);
        this.listenevents.push(thisevent);

this.container.one('form').on('submit', function() {
            // Prevent duplicate submissions on submit
            this.submitbutton.setAttribute('disabled', 'disabled');
            this.options.setAttribute('disabled', 'disabled');
            this.cancel_listenevents();
        }, this);

// Hook onto the cancel button to hide the form
        thisevent = this.container.one('.addcancel').on('click', this.cancel_popup, this);
        this.listenevents.push(thisevent);

// Hide will be managed by cancel_popup after restoring the body overflow
        thisevent = bb.one('button.closebutton').on('click', this.cancel_popup, this);
        this.listenevents.push(thisevent);

// Grab global keyup events and handle them
        thisevent = Y.one('document').on('keydown', this.handle_key_press, this);
        this.listenevents.push(thisevent);

// Add references to various elements we adjust
        this.submitbutton = this.container.one('.submitbutton');

// Disable the submit element until the user makes a selection
        this.submitbutton.set('disabled', 'true');

// Ensure that the options are shown
        this.options.removeAttribute('disabled');

// Display the panel
        this.panel.show(e);

// Re-centre the dialogue after we've shown it.
        this.center_dialogue(dialogue);

// Finally, focus the first radio element - this enables form selection via the keyboard
        this.container.one('.option input[type=radio]').focus();

// Trigger check_options to set the initial jumpurl
        this.check_options();
    },

/**
     * Cancel any listen events in the listenevents queue
     *
     * Several locations add event handlers which should only be called before the form is submitted. This provides
     * a way of cancelling those events.
     *
     * @method cancel_listenevents
     */
    cancel_listenevents: function() {
        // Detach all listen events to prevent duplicate triggers
        var thisevent;
        while (this.listenevents.length) {
            thisevent = this.listenevents.shift();
            thisevent.detach();
        }
    },

/**
      * Calculate the optimum height of the chooser dialogue
      *
      * This tries to set a sensible maximum and minimum to ensure that some options are always shown, and preferably
      * all, whilst fitting the box within the current viewport.
      *
      * @method center_dialogue
      * @param Node {dialogue} Y.Node The dialogue
      */
    center_dialogue: function(dialogue) {
        var bb = this.panel.get('boundingBox'),
            winheight = bb.get('winHeight'),
            newheight, totalheight;

if (this.panel.shouldResizeFullscreen()) {
            dialogue.setStyle('maxHeight', '100%');
            dialogue.setStyle('height', 'auto');
            this.panel.makeResponsive();
            return;
        }

// Try and set a sensible max-height -- this must be done before setting the top
        // Set a default height of 640px
        newheight = this.get('maxheight');
        if (winheight <= newheight) {
            // Deal with smaller window sizes
            if (winheight <= this.get('minheight')) {
                newheight = this.get('minheight');
            } else {
                newheight = winheight;
            }
        }

// If the dialogue is larger than a reasonable minimum height, we
        // disable the page scrollbars.
        if (newheight > this.get('minheight')) {
            // Disable the page scrollbars.
            if (this.panel.lockScroll && !this.panel.lockScroll.isActive()) {
                this.panel.lockScroll.enableScrollLock(true);
            }
        } else {
            // Re-enable the page scrollbars.
            if (this.panel.lockScroll && this.panel.lockScroll.isActive()) {
                this.panel.lockScroll.disableScrollLock();
            }
        }

// Take off 15px top and bottom for borders, plus 69px for the title and 57px for the
        // button area before setting the new max-height.
        totalheight = newheight;
        newheight = newheight - (69 + 57 + 15 + 15);
        dialogue.setStyle('maxHeight', newheight + 'px');

var dialogueheight = bb.getStyle('height');
        if (dialogueheight.match(/.*px$/)) {
            dialogueheight = dialogueheight.replace(/px$/, '');
        } else {
            dialogueheight = totalheight;
        }

if (dialogueheight < this.get('baseheight')) {
            dialogueheight = this.get('baseheight');
            dialogue.setStyle('height', dialogueheight + 'px');
        } else {
            dialogue.setStyle('height', 'auto');
        }

this.panel.centerDialogue();
    },

handle_key_press: function(e) {
        if (e.keyCode === 27) {
            this.cancel_popup(e);
        }
    },

cancel_popup: function(e) {
        // Prevent normal form submission before hiding
        e.preventDefault();
        this.hide();
    },

hide: function() {
        // Cancel all listen events
        this.cancel_listenevents();

this.container.detachAll();
        this.panel.hide();
    },

check_options: function() {
        // Check which options are set, and change the parent class
        // to show/hide help as required
        this.options.each(function(thisoption) {
            var optiondiv = thisoption.get('parentNode').get('parentNode');
            if (thisoption.get('checked')) {
                optiondiv.addClass('selected');

// Trigger any events for this option
                this.option_selected(thisoption);

// Ensure that the form may be submitted
                this.submitbutton.removeAttribute('disabled');

// Ensure that the radio remains focus so that keyboard navigation is still possible
                thisoption.focus();
            } else {
                optiondiv.removeClass('selected');
            }
        }, this);
    },

option_selected: function(e) {
        // Set a hidden input field with the value and name of the radio button.  When we submit the form, we
        // disable the radios to prevent duplicate submission. This has the result however that the value is never
        // submitted so we set this value to a hidden field instead
        this.hiddenRadioValue.setAttrs({
            value: e.get('value'),
            name: e.get('name')
        });
    },

/**
     * Return an array of class names prefixed with 'chooserdialogue-' and
     * the name of the type of dialogue.
     *
     * Note: Class name are converted to lower-case.
     *
     * If an array of arguments is supplied, each of these is prefixed and
     * lower-cased also.
     *
     * If no arguments are supplied, then the prefix is returned on it's
     * own.
     *
     * @method _getClassNames
     * @param {Array} [args] Any additional names to prefix and lower-case.
     * @return {Array}
     * @private
     */
    _getClassNames: function(args) {
        var prefix = 'chooserdialogue-' + this.name,
            results = [];

results.push(prefix.toLowerCase());
        if (args) {
            var arg;
            for (arg in args) {
                results.push((prefix + '-' + arg).toLowerCase());
            }
        }

return results;
    }
},
{
    NAME: 'moodle-core-chooserdialogue',
    ATTRS: {
        /**
         * The minimum height (in pixels) before resizing is prevented and scroll
         * locking disabled.
         *
         * @attribute minheight
         * @type Number
         * @default 300
         */
        minheight: {
            value: 300
        },

/**
         * The base height??
         *
         * @attribute baseheight
         * @type Number
         * @default 400
         */
        baseheight: {
            value: 400
        },

/**
         * The maximum height (in pixels) at which we stop resizing.
         *
         * @attribute maxheight
         * @type Number
         * @default 300
         */
        maxheight: {
            value: 660
        },

/**
         * The title of the close button.
         *
         * @attribute closeButtonTitle
         * @type String
         * @default 'Close'
         */
        closeButtonTitle: {
            validator: Y.Lang.isString,
            value: 'Close'
        }
    }
});
M.core = M.core || {};
M.core.chooserdialogue = CHOOSERDIALOGUE;

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