Proyectos de Subversion Moodle

/**

 * Section drag and drop.

 *

 * @class M.course.dragdrop.section

 * @constructor

 * @extends M.core.dragdrop

 */

var DRAGSECTION = function() {

    DRAGSECTION.superclass.constructor.apply(this, arguments);

};

Y.extend(DRAGSECTION, M.core.dragdrop, {

    sectionlistselector: null,

    initializer: function() {

        // Set group for parent class

        this.groups = [CSS.SECTIONDRAGGABLE];

        this.samenodeclass = M.course.format.get_sectionwrapperclass();

        this.parentnodeclass = M.course.format.get_containerclass();

        // Detect the direction of travel.

        this.detectkeyboarddirection = true;

        // Check if we are in single section mode

        if (Y.Node.one('.' + CSS.JUMPMENU)) {

            return false;

        }

        // Initialise sections dragging

        this.sectionlistselector = M.course.format.get_section_wrapper(Y);

        if (this.sectionlistselector) {

            this.sectionlistselector = '.' + CSS.COURSECONTENT + ' ' + this.sectionlistselector;

            this.setup_for_section(this.sectionlistselector);

            // Make each li element in the lists of sections draggable

            var del = new Y.DD.Delegate({

                container: '.' + CSS.COURSECONTENT,

                nodes: '.' + CSS.SECTIONDRAGGABLE,

                target: true,

                handles: ['.' + CSS.LEFT],

                dragConfig: {groups: this.groups}

            });

            del.dd.plug(Y.Plugin.DDProxy, {

                // Don't move the node at the end of the drag

                moveOnEnd: false

            });

            del.dd.plug(Y.Plugin.DDConstrained, {

                // Keep it inside the .course-content

                constrain: '#' + CSS.PAGECONTENT,

                stickY: true

            });

            del.dd.plug(Y.Plugin.DDWinScroll);

        }

    },

     /**

     * Apply dragdrop features to the specified selector or node that refers to section(s)

     *

     * @method setup_for_section

     * @param {String} baseselector The CSS selector or node to limit scope to

     */

    setup_for_section: function(baseselector) {

        Y.Node.all(baseselector).each(function(sectionnode) {

            // Determine the section ID

            var sectionid = Y.Moodle.core_course.util.section.getId(sectionnode);

            // We skip the top section as it is not draggable

            if (sectionid > 0) {

                // Remove move icons

                var movedown = sectionnode.one('.' + CSS.RIGHT + ' a.' + CSS.MOVEDOWN);

                var moveup = sectionnode.one('.' + CSS.RIGHT + ' a.' + CSS.MOVEUP);

                // Add dragger icon

                var title = M.util.get_string('movesection', 'moodle', sectionid);

                var cssleft = sectionnode.one('.' + CSS.LEFT);

                if ((movedown || moveup) && cssleft) {

                    cssleft.setStyle('cursor', 'move');

                    cssleft.appendChild(this.get_drag_handle(title, CSS.SECTIONHANDLE, 'icon', true));

                    if (moveup) {

                        if (moveup.previous('br')) {

                            moveup.previous('br').remove();

                        } else if (moveup.next('br')) {

                            moveup.next('br').remove();

                        }

                        if (moveup.ancestor('.section_action_menu') && moveup.ancestor().get('nodeName').toLowerCase() == 'li') {

                            moveup.ancestor().remove();

                        } else {

                            moveup.remove();

                        }

                    }

                    if (movedown) {

                        if (movedown.previous('br')) {

                            movedown.previous('br').remove();

                        } else if (movedown.next('br')) {

                            movedown.next('br').remove();

                        }

                        var movedownParentType = movedown.ancestor().get('nodeName').toLowerCase();

                        if (movedown.ancestor('.section_action_menu') && movedownParentType == 'li') {

                            movedown.ancestor().remove();

                        } else {

                            movedown.remove();

                        }

                    }

                    // This section can be moved - add the class to indicate this to Y.DD.

                    sectionnode.addClass(CSS.SECTIONDRAGGABLE);

                }

            }

        }, this);

    },

    /*

     * Drag-dropping related functions

     */

    drag_start: function(e) {

        // Get our drag object

        var drag = e.target;

        // This is the node that the user started to drag.

        var node = drag.get('node');

        // This is the container node that will follow the mouse around,

        // or during a keyboard drag and drop the original node.

        var dragnode = drag.get('dragNode');

        if (node === dragnode) {

            return;

        }

        // Creat a dummy structure of the outer elemnents for clean styles application

        var containernode = Y.Node.create('<' + M.course.format.get_containernode() +

                '></' + M.course.format.get_containernode() + '>');

        containernode.addClass(M.course.format.get_containerclass());

        var sectionnode = Y.Node.create('<' + M.course.format.get_sectionwrappernode() +

                '></' + M.course.format.get_sectionwrappernode() + '>');

        sectionnode.addClass(M.course.format.get_sectionwrapperclass());

        sectionnode.setStyle('margin', 0);

        sectionnode.setContent(node.get('innerHTML'));

        containernode.appendChild(sectionnode);

        dragnode.setContent(containernode);

        dragnode.addClass(CSS.COURSECONTENT);

    },

    drag_dropmiss: function(e) {

        // Missed the target, but we assume the user intended to drop it

        // on the last last ghost node location, e.drag and e.drop should be

        // prepared by global_drag_dropmiss parent so simulate drop_hit(e).

        this.drop_hit(e);

    },

    get_section_index: function(node) {

        var sectionlistselector = '.' + CSS.COURSECONTENT + ' ' + M.course.format.get_section_selector(Y),

            sectionList = Y.all(sectionlistselector),

            nodeIndex = sectionList.indexOf(node),

            zeroIndex = sectionList.indexOf(Y.one('#section-0'));

        return (nodeIndex - zeroIndex);

    },

    drop_hit: function(e) {

        var drag = e.drag;

        // Get references to our nodes and their IDs.

        var dragnode = drag.get('node'),

            dragnodeid = Y.Moodle.core_course.util.section.getId(dragnode),

            loopstart = dragnodeid,

            dropnodeindex = this.get_section_index(dragnode),

            loopend = dropnodeindex;

        if (dragnodeid === dropnodeindex) {

            Y.log("Skipping move - same location moving " + dragnodeid + " to " + dropnodeindex, 'debug', 'moodle-course-dragdrop');

            return;

        }

        Y.log("Moving from position " + dragnodeid + " to position " + dropnodeindex, 'debug', 'moodle-course-dragdrop');

        if (loopstart > loopend) {

            // If we're going up, we need to swap the loop order

            // because loops can't go backwards.

            loopstart = dropnodeindex;

            loopend = dragnodeid;

        }

        // Get the list of nodes.

        drag.get('dragNode').removeClass(CSS.COURSECONTENT);

        var sectionlist = Y.Node.all(this.sectionlistselector);

        // Add a lightbox if it's not there.

        var lightbox = M.util.add_lightbox(Y, dragnode);

        // Handle any variables which we must pass via AJAX.

        var params = {},

            pageparams = this.get('config').pageparams,

            varname;

        for (varname in pageparams) {

            if (!pageparams.hasOwnProperty(varname)) {

                continue;

            }

            params[varname] = pageparams[varname];

        }

        // Prepare request parameters

        params.sesskey = M.cfg.sesskey;

        params.courseId = this.get('courseid');

        params['class'] = 'section';

        params.field = 'move';

        params.id = dragnodeid;

        params.value = dropnodeindex;

        // Perform the AJAX request.

        var uri = M.cfg.wwwroot + this.get('ajaxurl');

        Y.io(uri, {

            method: 'POST',

            data: params,

            on: {

                start: function() {

                    lightbox.show();

                },

                success: function(tid, response) {

                    // Update section titles, we can't simply swap them as

                    // they might have custom title

                    try {

                        var responsetext = Y.JSON.parse(response.responseText);

                        if (responsetext.error) {

                            new M.core.ajaxException(responsetext);

                        }

                        M.course.format.process_sections(Y, sectionlist, responsetext, loopstart, loopend);

                    } catch (e) {

                        // Ignore.

                    }

                    // Update all of the section IDs - first unset them, then set them

                    // to avoid duplicates in the DOM.

                    var index;

                    // Classic bubble sort algorithm is applied to the section

                    // nodes between original drag node location and the new one.

                    var swapped = false;

                    do {

                        swapped = false;

                        for (index = loopstart; index <= loopend; index++) {

                            if (Y.Moodle.core_course.util.section.getId(sectionlist.item(index - 1)) >

                                        Y.Moodle.core_course.util.section.getId(sectionlist.item(index))) {

                                Y.log("Swapping " + Y.Moodle.core_course.util.section.getId(sectionlist.item(index - 1)) +

                                        " with " + Y.Moodle.core_course.util.section.getId(sectionlist.item(index)));

                                // Swap section id.

                                var sectionid = sectionlist.item(index - 1).get('id');

                                sectionlist.item(index - 1).set('id', sectionlist.item(index).get('id'));

                                sectionlist.item(index).set('id', sectionid);

                                // See what format needs to swap.

                                M.course.format.swap_sections(Y, index - 1, index);

                                // Update flag.

                                swapped = true;

                            }

                            sectionlist.item(index).setAttribute('data-sectionid',

                                Y.Moodle.core_course.util.section.getId(sectionlist.item(index)));

                        }

                        loopend = loopend - 1;

                    } while (swapped);

                    window.setTimeout(function() {

                        lightbox.hide();

                    }, 250);

                    // Update course state.

                    M.course.coursebase.invoke_function('updateMovedSectionState');

                },

                failure: function(tid, response) {

                    this.ajax_failure(response);

                    lightbox.hide();

                }

            },

            context: this

        });

    }

}, {

    NAME: 'course-dragdrop-section',

    ATTRS: {

        courseid: {

            value: null

        },

        ajaxurl: {

            value: 0

        },

        config: {

            value: 0

        }

    }

});

M.course = M.course || {};

M.course.init_section_dragdrop = function(params) {

    new DRAGSECTION(params);

};