323 lines
14 KiB
JavaScript
323 lines
14 KiB
JavaScript
define(["domReady", "jquery", "jquery.ui", "gettext", "js/views/feedback_notification", "draggabilly"],
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function (domReady, $, ui, gettext, NotificationView, Draggabilly) {
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var overviewDragger = {
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droppableClasses: 'drop-target drop-target-prepend drop-target-before drop-target-after',
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validDropClass: "valid-drop",
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expandOnDropClass: "expand-on-drop",
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/*
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* Determine information about where to drop the currently dragged
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* element. Returns the element to attach to and the method of
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* attachment ('before', 'after', or 'prepend').
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*/
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findDestination: function (ele, yChange) {
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var eleY = ele.offset().top;
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var containers = $(ele.data('droppable-class'));
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for (var i = 0; i < containers.length; i++) {
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var container = $(containers[i]);
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// Exclude the 'new unit' buttons, and make sure we don't
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// prepend an element to itself
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var siblings = container.children().filter(function () {
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return $(this).data('id') !== undefined && !$(this).is(ele);
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});
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// If the container is collapsed, check to see if the
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// element is on top of its parent list -- don't check the
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// position of the container
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var parentList = container.parents(ele.data('parent-location-selector')).first();
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if (parentList.hasClass('collapsed')) {
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if (Math.abs(eleY - parentList.offset().top) < 10) {
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return {
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ele: container,
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attachMethod: 'prepend',
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parentList: parentList
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};
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}
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}
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// Otherwise, do check the container
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else {
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// If the list is empty, we should prepend to it,
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// unless both elements are at the same location --
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// this prevents the user from being unable to expand
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// a section
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var containerY = container.offset().top;
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if (siblings.length == 0 &&
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containerY != eleY &&
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Math.abs(eleY - containerY) < 50) {
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return {
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ele: container,
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attachMethod: 'prepend'
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};
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}
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// Otherwise the list is populated, and we should attach before/after a sibling
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else {
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for (var j = 0; j < siblings.length; j++) {
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var $sibling = $(siblings[j]);
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var siblingY = $sibling.offset().top;
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var siblingHeight = $sibling.height();
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var siblingYEnd = siblingY + siblingHeight;
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// Facilitate dropping into the beginning or end of a list
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// (coming from opposite direction) via a "fudge factor". Math.min is for Jasmine test.
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var fudge = Math.min(Math.ceil(siblingHeight / 2), 20);
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// Dragging up into end of list.
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if (j == siblings.length - 1 && yChange < 0 && Math.abs(eleY - siblingYEnd) <= fudge) {
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return {
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ele: $sibling,
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attachMethod: 'after'
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};
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}
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// Dragging down into beginning of list.
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else if (j == 0 && yChange > 0 && Math.abs(eleY - siblingY) <= fudge) {
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return {
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ele: $sibling,
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attachMethod: 'before'
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};
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}
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else if (eleY >= siblingY && eleY <= siblingYEnd) {
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return {
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ele: $sibling,
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attachMethod: eleY - siblingY <= siblingHeight / 2 ? 'before' : 'after'
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};
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}
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}
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}
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}
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}
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// Failed drag
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return {
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ele: null,
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attachMethod: ''
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}
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},
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// Information about the current drag.
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dragState: {},
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onDragStart: function (draggie, event, pointer) {
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var ele = $(draggie.element);
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this.dragState = {
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// Which element will be dropped into/onto on success
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dropDestination: null,
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// How we attach to the destination: 'before', 'after', 'prepend'
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attachMethod: '',
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// If dragging to an empty section, the parent section
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parentList: null,
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// The y location of the last dragMove event (to determine direction).
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lastY: 0,
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// The direction the drag is moving in (negative means up, positive down).
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dragDirection: 0
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};
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if (!ele.hasClass('collapsed')) {
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ele.addClass('collapsed');
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ele.find('.expand-collapse-icon').first().addClass('expand').removeClass('collapse');
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// onDragStart gets called again after the collapse, so we can't just store a variable in the dragState.
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ele.addClass(this.expandOnDropClass);
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}
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},
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onDragMove: function (draggie, event, pointer) {
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// Handle scrolling of the browser.
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var scrollAmount = 0;
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var dragBuffer = 10;
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if (window.innerHeight - dragBuffer < pointer.clientY) {
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scrollAmount = dragBuffer;
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}
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else if (dragBuffer > pointer.clientY) {
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scrollAmount = -(dragBuffer);
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}
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if (scrollAmount !== 0) {
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window.scrollBy(0, scrollAmount);
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return;
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}
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var yChange = draggie.dragPoint.y - this.dragState.lastY;
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if (yChange !== 0) {
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this.dragState.direction = yChange;
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}
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this.dragState.lastY = draggie.dragPoint.y;
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var ele = $(draggie.element);
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var destinationInfo = this.findDestination(ele, this.dragState.direction);
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var destinationEle = destinationInfo.ele;
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this.dragState.parentList = destinationInfo.parentList;
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// Clear out the old destination
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if (this.dragState.dropDestination) {
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this.dragState.dropDestination.removeClass(this.droppableClasses);
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}
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// Mark the new destination
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if (destinationEle && this.pointerInBounds(pointer, ele)) {
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ele.addClass(this.validDropClass);
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destinationEle.addClass('drop-target drop-target-' + destinationInfo.attachMethod);
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this.dragState.attachMethod = destinationInfo.attachMethod;
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this.dragState.dropDestination = destinationEle;
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}
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else {
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ele.removeClass(this.validDropClass);
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this.dragState.attachMethod = '';
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this.dragState.dropDestination = null;
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}
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},
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onDragEnd: function (draggie, event, pointer) {
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var ele = $(draggie.element);
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var destination = this.dragState.dropDestination;
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// Clear dragging state in preparation for the next event.
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if (destination) {
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destination.removeClass(this.droppableClasses);
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}
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ele.removeClass(this.validDropClass);
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// If the drag succeeded, rearrange the DOM and send the result.
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if (destination && this.pointerInBounds(pointer, ele)) {
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// Make sure we don't drop into a collapsed element
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if (this.dragState.parentList) {
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this.expandElement(this.dragState.parentList);
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}
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var method = this.dragState.attachMethod;
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destination[method](ele);
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this.handleReorder(ele);
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}
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// If the drag failed, send it back
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else {
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$('.was-dragging').removeClass('was-dragging');
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ele.addClass('was-dragging');
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}
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if (ele.hasClass(this.expandOnDropClass)) {
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this.expandElement(ele);
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ele.removeClass(this.expandOnDropClass);
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}
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// Everything in its right place
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ele.css({
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top: 'auto',
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left: 'auto'
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});
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this.dragState = {};
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},
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pointerInBounds: function (pointer, ele) {
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return pointer.clientX >= ele.offset().left && pointer.clientX < ele.offset().left + ele.width();
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},
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expandElement: function (ele) {
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ele.removeClass('collapsed');
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ele.find('.expand-collapse-icon').first().removeClass('expand').addClass('collapse');
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},
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/*
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* Find all parent-child changes and save them.
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*/
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handleReorder: function (ele) {
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var parentSelector = ele.data('parent-location-selector');
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var childrenSelector = ele.data('child-selector');
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var newParentEle = ele.parents(parentSelector).first();
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var newParentID = newParentEle.data('id');
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var oldParentID = ele.data('parent-id');
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// If the parent has changed, update the children of the old parent.
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if (oldParentID !== newParentID) {
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// Find the old parent element.
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var oldParentEle = $(parentSelector).filter(function () {
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return $(this).data('id') === oldParentID;
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});
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this.saveItem(oldParentEle, childrenSelector, function () {
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ele.data('parent-id', newParentID);
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});
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}
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var saving = new NotificationView.Mini({
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title: gettext('Saving…')
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});
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saving.show();
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ele.addClass('was-dropped');
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// Timeout interval has to match what is in the CSS.
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setTimeout(function () {
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ele.removeClass('was-dropped');
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}, 1000);
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this.saveItem(newParentEle, childrenSelector, function () {
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saving.hide();
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});
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},
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/*
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* Actually save the update to the server. Takes the element
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* representing the parent item to save, a CSS selector to find
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* its children, and a success callback.
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*/
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saveItem: function (ele, childrenSelector, success) {
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// Find all current child IDs.
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var children = _.map(
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ele.find(childrenSelector),
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function (child) {
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return $(child).data('id');
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}
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);
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$.ajax({
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url: '/save_item',
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type: 'POST',
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dataType: 'json',
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contentType: 'application/json',
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data: JSON.stringify({
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id: ele.data('id'),
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children: children
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}),
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success: success
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});
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},
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/*
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* Make `type` draggable using `handleClass`, able to be dropped
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* into `droppableClass`, and with parent type
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* `parentLocationSelector`.
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*/
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makeDraggable: function (type, handleClass, droppableClass, parentLocationSelector) {
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_.each(
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$(type),
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function (ele) {
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// Remember data necessary to reconstruct the parent-child relationships
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$(ele).data('droppable-class', droppableClass);
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$(ele).data('parent-location-selector', parentLocationSelector);
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$(ele).data('child-selector', type);
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var draggable = new Draggabilly(ele, {
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handle: handleClass,
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containment: '.wrapper-dnd'
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});
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draggable.on('dragStart', _.bind(overviewDragger.onDragStart, overviewDragger));
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draggable.on('dragMove', _.bind(overviewDragger.onDragMove, overviewDragger));
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draggable.on('dragEnd', _.bind(overviewDragger.onDragEnd, overviewDragger));
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}
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);
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}
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};
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domReady(function() {
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// Section
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overviewDragger.makeDraggable(
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'.courseware-section',
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'.section-drag-handle',
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'.courseware-overview',
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'article.courseware-overview'
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);
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// Subsection
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overviewDragger.makeDraggable(
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'.id-holder',
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'.subsection-drag-handle',
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'.subsection-list > ol',
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'.courseware-section'
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);
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// Unit
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overviewDragger.makeDraggable(
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'.unit',
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'.unit-drag-handle',
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'ol.sortable-unit-list',
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'li.branch, article.subsection-body'
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);
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});
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return overviewDragger;
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});
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