web/src/main/webapp/js/dnd-lists.js
/*
* Licensed to Apereo under one or more contributor license
* agreements. See the NOTICE file distributed with this work
* for additional information regarding copyright ownership.
* Apereo licenses this file to you under the Apache License,
* Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a
* copy of the License at the following location:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
/* eslint-disable */
'use strict';
define(['angular'], function (angular) {
/**
* angular-drag-and-drop-lists v2.1.0
*
* Copyright (c) 2014 Marcel Juenemann marcel@juenemann.cc
* Copyright (c) 2014-2017 Google Inc.
* https://github.com/marceljuenemann/angular-drag-and-drop-lists
*
* License: MIT
*/
(function (dndLists) {
// In standard-compliant browsers we use a custom mime type and also encode the dnd-type in it.
// However, IE and Edge only support a limited number of mime types. The workarounds are described
// in https://github.com/marceljuenemann/angular-drag-and-drop-lists/wiki/Data-Transfer-Design
var MIME_TYPE = 'application/x-dnd';
var EDGE_MIME_TYPE = 'application/json';
var MSIE_MIME_TYPE = 'Text';
// All valid HTML5 drop effects, in the order in which we prefer to use them.
var ALL_EFFECTS = ['move', 'copy', 'link'];
/**
* Use the dnd-draggable attribute to make your element draggable
*
* Attributes:
* - dnd-draggable Required attribute. The value has to be an object that represents the data
* of the element. In case of a drag and drop operation the object will be
* serialized and unserialized on the receiving end.
* - dnd-effect-allowed Use this attribute to limit the operations that can be performed. Valid
* options are "move", "copy" and "link", as well as "all", "copyMove",
* "copyLink" and "linkMove". The semantics of these operations are up to you
* and have to be implemented using the callbacks described below. If you
* allow multiple options, the user can choose between them by using the
* modifier keys (OS specific). The cursor will be changed accordingly,
* expect for IE and Edge, where this is not supported.
* - dnd-type Use this attribute if you have different kinds of items in your
* application and you want to limit which items can be dropped into which
* lists. Combine with dnd-allowed-types on the dnd-list(s). This attribute
* must be a lower case string. Upper case characters can be used, but will
* be converted to lower case automatically.
* - dnd-disable-if You can use this attribute to dynamically disable the draggability of the
* element. This is useful if you have certain list items that you don't want
* to be draggable, or if you want to disable drag & drop completely without
* having two different code branches (e.g. only allow for admins).
*
* Callbacks:
* - dnd-dragstart Callback that is invoked when the element was dragged. The original
* dragstart event will be provided in the local event variable.
* - dnd-moved Callback that is invoked when the element was moved. Usually you will
* remove your element from the original list in this callback, since the
* directive is not doing that for you automatically. The original dragend
* event will be provided in the local event variable.
* - dnd-copied Same as dnd-moved, just that it is called when the element was copied
* instead of moved, so you probably want to implement a different logic.
* - dnd-linked Same as dnd-moved, just that it is called when the element was linked
* instead of moved, so you probably want to implement a different logic.
* - dnd-canceled Callback that is invoked if the element was dragged, but the operation was
* canceled and the element was not dropped. The original dragend event will
* be provided in the local event variable.
* - dnd-dragend Callback that is invoked when the drag operation ended. Available local
* variables are event and dropEffect.
* - dnd-selected Callback that is invoked when the element was clicked but not dragged.
* The original click event will be provided in the local event variable.
* - dnd-callback Custom callback that is passed to dropzone callbacks and can be used to
* communicate between source and target scopes. The dropzone can pass user
* defined variables to this callback.
*
* CSS classes:
* - dndDragging This class will be added to the element while the element is being
* dragged. It will affect both the element you see while dragging and the
* source element that stays at it's position. Do not try to hide the source
* element with this class, because that will abort the drag operation.
* - dndDraggingSource This class will be added to the element after the drag operation was
* started, meaning it only affects the original element that is still at
* it's source position, and not the "element" that the user is dragging with
* his mouse pointer.
*/
dndLists.directive('dndDraggable', ['$parse', '$timeout', function ($parse, $timeout) {
return function (scope, element, attr) {
// Set the HTML5 draggable attribute on the element.
element.attr("draggable", "true");
// If the dnd-disable-if attribute is set, we have to watch that.
if (attr.dndDisableIf) {
scope.$watch(attr.dndDisableIf, function (disabled) {
element.attr("draggable", !disabled);
});
}
/**
* When the drag operation is started we have to prepare the dataTransfer object,
* which is the primary way we communicate with the target element
*/
element.on('dragstart', function (event) {
event = event.originalEvent || event;
// Check whether the element is draggable, since dragstart might be triggered on a child.
if (element.attr('draggable') == 'false') return true;
// Initialize global state.
dndState.isDragging = true;
dndState.itemType = attr.dndType && scope.$eval(attr.dndType).toLowerCase();
// Set the allowed drop effects. See below for special IE handling.
dndState.dropEffect = "none";
dndState.effectAllowed = attr.dndEffectAllowed || ALL_EFFECTS[0];
event.dataTransfer.effectAllowed = dndState.effectAllowed;
// Internet Explorer and Microsoft Edge don't support custom mime types, see design doc:
// https://github.com/marceljuenemann/angular-drag-and-drop-lists/wiki/Data-Transfer-Design
var item = scope.$eval(attr.dndDraggable);
var mimeType = MIME_TYPE + (dndState.itemType ? ('-' + dndState.itemType) : '');
try {
event.dataTransfer.setData(mimeType, angular.toJson(item));
} catch (e) {
// Setting a custom MIME type did not work, we are probably in IE or Edge.
var data = angular.toJson({item: item, type: dndState.itemType});
try {
event.dataTransfer.setData(EDGE_MIME_TYPE, data);
} catch (e) {
// We are in Internet Explorer and can only use the Text MIME type. Also note that IE
// does not allow changing the cursor in the dragover event, therefore we have to choose
// the one we want to display now by setting effectAllowed.
var effectsAllowed = filterEffects(ALL_EFFECTS, dndState.effectAllowed);
event.dataTransfer.effectAllowed = effectsAllowed[0];
event.dataTransfer.setData(MSIE_MIME_TYPE, data);
}
}
// Add CSS classes. See documentation above.
element.addClass("dndDragging");
$timeout(function () {
element.addClass("dndDraggingSource");
}, 0);
// Try setting a proper drag image if triggered on a dnd-handle (won't work in IE).
if (event._dndHandle && event.dataTransfer.setDragImage) {
event.dataTransfer.setDragImage(element[0], 0, 0);
}
// Invoke dragstart callback and prepare extra callback for dropzone.
$parse(attr.dndDragstart)(scope, {event: event});
if (attr.dndCallback) {
var callback = $parse(attr.dndCallback);
dndState.callback = function (params) {
return callback(scope, params || {});
};
}
event.stopPropagation();
});
/**
* The dragend event is triggered when the element was dropped or when the drag
* operation was aborted (e.g. hit escape button). Depending on the executed action
* we will invoke the callbacks specified with the dnd-moved or dnd-copied attribute.
*/
element.on('dragend', function (event) {
event = event.originalEvent || event;
// Invoke callbacks. Usually we would use event.dataTransfer.dropEffect to determine
// the used effect, but Chrome has not implemented that field correctly. On Windows
// it always sets it to 'none', while Chrome on Linux sometimes sets it to something
// else when it's supposed to send 'none' (drag operation aborted).
scope.$apply(function () {
var dropEffect = dndState.dropEffect;
var cb = {copy: 'dndCopied', link: 'dndLinked', move: 'dndMoved', none: 'dndCanceled'};
$parse(attr[cb[dropEffect]])(scope, {event: event});
$parse(attr.dndDragend)(scope, {event: event, dropEffect: dropEffect});
});
// Clean up
dndState.isDragging = false;
dndState.callback = undefined;
element.removeClass("dndDragging");
element.removeClass("dndDraggingSource");
event.stopPropagation();
// In IE9 it is possible that the timeout from dragstart triggers after the dragend handler.
$timeout(function () {
element.removeClass("dndDraggingSource");
}, 0);
});
/**
* When the element is clicked we invoke the callback function
* specified with the dnd-selected attribute.
*/
element.on('click', function (event) {
if (!attr.dndSelected) return;
event = event.originalEvent || event;
scope.$apply(function () {
$parse(attr.dndSelected)(scope, {event: event});
});
// Prevent triggering dndSelected in parent elements.
event.stopPropagation();
});
/**
* Workaround to make element draggable in IE9
*/
element.on('selectstart', function () {
if (this.dragDrop) this.dragDrop();
});
};
}]);
/**
* Use the dnd-list attribute to make your list element a dropzone. Usually you will add a single
* li element as child with the ng-repeat directive. If you don't do that, we will not be able to
* position the dropped element correctly. If you want your list to be sortable, also add the
* dnd-draggable directive to your li element(s).
*
* Attributes:
* - dnd-list Required attribute. The value has to be the array in which the data of
* the dropped element should be inserted. The value can be blank if used
* with a custom dnd-drop handler that always returns true.
* - dnd-allowed-types Optional array of allowed item types. When used, only items that had a
* matching dnd-type attribute will be dropable. Upper case characters will
* automatically be converted to lower case.
* - dnd-effect-allowed Optional string expression that limits the drop effects that can be
* performed in the list. See dnd-effect-allowed on dnd-draggable for more
* details on allowed options. The default value is all.
* - dnd-disable-if Optional boolean expresssion. When it evaluates to true, no dropping
* into the list is possible. Note that this also disables rearranging
* items inside the list.
* - dnd-horizontal-list Optional boolean expresssion. When it evaluates to true, the positioning
* algorithm will use the left and right halfs of the list items instead of
* the upper and lower halfs.
* - dnd-external-sources Optional boolean expression. When it evaluates to true, the list accepts
* drops from sources outside of the current browser tab. This allows to
* drag and drop accross different browser tabs. The only major browser
* that does not support this is currently Microsoft Edge.
*
* Callbacks:
* - dnd-dragover Optional expression that is invoked when an element is dragged over the
* list. If the expression is set, but does not return true, the element is
* not allowed to be dropped. The following variables will be available:
* - event: The original dragover event sent by the browser.
* - index: The position in the list at which the element would be dropped.
* - type: The dnd-type set on the dnd-draggable, or undefined if non was
* set. Will be null for drops from external sources in IE and Edge,
* since we don't know the type in those cases.
* - dropEffect: One of move, copy or link, see dnd-effect-allowed.
* - external: Whether the element was dragged from an external source.
* - callback: If dnd-callback was set on the source element, this is a
* function reference to the callback. The callback can be invoked with
* custom variables like this: callback({var1: value1, var2: value2}).
* The callback will be executed on the scope of the source element. If
* dnd-external-sources was set and external is true, this callback will
* not be available.
* - dnd-drop Optional expression that is invoked when an element is dropped on the
* list. The same variables as for dnd-dragover will be available, with the
* exception that type is always known and therefore never null. There
* will also be an item variable, which is the transferred object. The
* return value determines the further handling of the drop:
* - falsy: The drop will be canceled and the element won't be inserted.
* - true: Signalises that the drop is allowed, but the dnd-drop
* callback already took care of inserting the element.
* - otherwise: All other return values will be treated as the object to
* insert into the array. In most cases you want to simply return the
* item parameter, but there are no restrictions on what you can return.
* - dnd-inserted Optional expression that is invoked after a drop if the element was
* actually inserted into the list. The same local variables as for
* dnd-drop will be available. Note that for reorderings inside the same
* list the old element will still be in the list due to the fact that
* dnd-moved was not called yet.
*
* CSS classes:
* - dndPlaceholder When an element is dragged over the list, a new placeholder child
* element will be added. This element is of type li and has the class
* dndPlaceholder set. Alternatively, you can define your own placeholder
* by creating a child element with dndPlaceholder class.
* - dndDragover Will be added to the list while an element is dragged over the list.
*/
dndLists.directive('dndList', ['$parse', function ($parse) {
return function (scope, element, attr) {
// While an element is dragged over the list, this placeholder element is inserted
// at the location where the element would be inserted after dropping.
var placeholder = getPlaceholderElement();
placeholder.remove();
var placeholderNode = placeholder[0];
var listNode = element[0];
var listSettings = {};
/**
* The dragenter event is fired when a dragged element or text selection enters a valid drop
* target. According to the spec, we either need to have a dropzone attribute or listen on
* dragenter events and call preventDefault(). It should be noted though that no browser seems
* to enforce this behaviour.
*/
element.on('dragenter', function (event) {
event = event.originalEvent || event;
// Calculate list properties, so that we don't have to repeat this on every dragover event.
var types = attr.dndAllowedTypes && scope.$eval(attr.dndAllowedTypes);
listSettings = {
allowedTypes: angular.isArray(types) && types.join('|').toLowerCase().split('|'),
disabled: attr.dndDisableIf && scope.$eval(attr.dndDisableIf),
externalSources: attr.dndExternalSources && scope.$eval(attr.dndExternalSources),
horizontal: attr.dndHorizontalList && scope.$eval(attr.dndHorizontalList)
};
var mimeType = getMimeType(event.dataTransfer.types);
if (!mimeType || !isDropAllowed(getItemType(mimeType))) return true;
event.preventDefault();
});
/**
* The dragover event is triggered "every few hundred milliseconds" while an element
* is being dragged over our list, or over an child element.
*/
element.on('dragover', function (event) {
event = event.originalEvent || event;
// Check whether the drop is allowed and determine mime type.
var mimeType = getMimeType(event.dataTransfer.types);
var itemType = getItemType(mimeType);
if (!mimeType || !isDropAllowed(itemType)) return true;
// Make sure the placeholder is shown, which is especially important if the list is empty.
if (placeholderNode.parentNode != listNode) {
element.append(placeholder);
}
if (event.target != listNode) {
// Try to find the node direct directly below the list node.
var listItemNode = event.target;
while (listItemNode.parentNode != listNode && listItemNode.parentNode) {
listItemNode = listItemNode.parentNode;
}
if (listItemNode.parentNode == listNode && listItemNode != placeholderNode) {
// If the mouse pointer is in the upper half of the list item element,
// we position the placeholder before the list item, otherwise after it.
var rect = listItemNode.getBoundingClientRect();
if (listSettings.horizontal) {
var isFirstHalf = event.clientX < rect.left + rect.width / 2;
} else {
var isFirstHalf = event.clientY < rect.top + rect.height / 2;
}
listNode.insertBefore(placeholderNode,
isFirstHalf ? listItemNode : listItemNode.nextSibling);
}
}
// In IE we set a fake effectAllowed in dragstart to get the correct cursor, we therefore
// ignore the effectAllowed passed in dataTransfer. We must also not access dataTransfer for
// drops from external sources, as that throws an exception.
var ignoreDataTransfer = mimeType == MSIE_MIME_TYPE;
var dropEffect = getDropEffect(event, ignoreDataTransfer);
if (dropEffect == 'none') return stopDragover();
// At this point we invoke the callback, which still can disallow the drop.
// We can't do this earlier because we want to pass the index of the placeholder.
if (attr.dndDragover && !invokeCallback(attr.dndDragover, event, dropEffect, itemType)) {
return stopDragover();
}
// Set dropEffect to modify the cursor shown by the browser, unless we're in IE, where this
// is not supported. This must be done after preventDefault in Firefox.
event.preventDefault();
if (!ignoreDataTransfer) {
event.dataTransfer.dropEffect = dropEffect;
}
element.addClass("dndDragover");
event.stopPropagation();
return false;
});
/**
* When the element is dropped, we use the position of the placeholder element as the
* position where we insert the transferred data. This assumes that the list has exactly
* one child element per array element.
*/
element.on('drop', function (event) {
event = event.originalEvent || event;
// Check whether the drop is allowed and determine mime type.
var mimeType = getMimeType(event.dataTransfer.types);
var itemType = getItemType(mimeType);
if (!mimeType || !isDropAllowed(itemType)) return true;
// The default behavior in Firefox is to interpret the dropped element as URL and
// forward to it. We want to prevent that even if our drop is aborted.
event.preventDefault();
// Unserialize the data that was serialized in dragstart.
try {
var data = JSON.parse(event.dataTransfer.getData(mimeType));
} catch (e) {
return stopDragover();
}
// Drops with invalid types from external sources might not have been filtered out yet.
if (mimeType == MSIE_MIME_TYPE || mimeType == EDGE_MIME_TYPE) {
itemType = data.type || undefined;
data = data.item;
if (!isDropAllowed(itemType)) return stopDragover();
}
// Special handling for internal IE drops, see dragover handler.
var ignoreDataTransfer = mimeType == MSIE_MIME_TYPE;
var dropEffect = getDropEffect(event, ignoreDataTransfer);
if (dropEffect == 'none') return stopDragover();
// Invoke the callback, which can transform the transferredObject and even abort the drop.
var index = getPlaceholderIndex();
if (attr.dndDrop) {
data = invokeCallback(attr.dndDrop, event, dropEffect, itemType, index, data);
if (!data) return stopDragover();
}
// The drop is definitely going to happen now, store the dropEffect.
dndState.dropEffect = dropEffect;
if (!ignoreDataTransfer) {
event.dataTransfer.dropEffect = dropEffect;
}
// Insert the object into the array, unless dnd-drop took care of that (returned true).
if (data !== true) {
scope.$apply(function () {
scope.$eval(attr.dndList).splice(index, 0, data);
});
}
invokeCallback(attr.dndInserted, event, dropEffect, itemType, index, data);
// Clean up
stopDragover();
event.stopPropagation();
return false;
});
/**
* We have to remove the placeholder when the element is no longer dragged over our list. The
* problem is that the dragleave event is not only fired when the element leaves our list,
* but also when it leaves a child element. Therefore, we determine whether the mouse cursor
* is still pointing to an element inside the list or not.
*/
element.on('dragleave', function (event) {
event = event.originalEvent || event;
var newTarget = document.elementFromPoint(event.clientX, event.clientY);
if (listNode.contains(newTarget) && !event._dndPhShown) {
// Signalize to potential parent lists that a placeholder is already shown.
event._dndPhShown = true;
} else {
stopDragover();
}
});
/**
* Given the types array from the DataTransfer object, returns the first valid mime type.
* A type is valid if it starts with MIME_TYPE, or it equals MSIE_MIME_TYPE or EDGE_MIME_TYPE.
*/
function getMimeType(types) {
if (!types) return MSIE_MIME_TYPE; // IE 9 workaround.
for (var i = 0; i < types.length; i++) {
if (types[i] == MSIE_MIME_TYPE || types[i] == EDGE_MIME_TYPE ||
types[i].substr(0, MIME_TYPE.length) == MIME_TYPE) {
return types[i];
}
}
return null;
}
/**
* Determines the type of the item from the dndState, or from the mime type for items from
* external sources. Returns undefined if no item type was set and null if the item type could
* not be determined.
*/
function getItemType(mimeType) {
if (dndState.isDragging) return dndState.itemType || undefined;
if (mimeType == MSIE_MIME_TYPE || mimeType == EDGE_MIME_TYPE) return null;
return (mimeType && mimeType.substr(MIME_TYPE.length + 1)) || undefined;
}
/**
* Checks various conditions that must be fulfilled for a drop to be allowed, including the
* dnd-allowed-types attribute. If the item Type is unknown (null), the drop will be allowed.
*/
function isDropAllowed(itemType) {
if (listSettings.disabled) return false;
if (!listSettings.externalSources && !dndState.isDragging) return false;
if (!listSettings.allowedTypes || itemType === null) return true;
return itemType && listSettings.allowedTypes.indexOf(itemType) != -1;
}
/**
* Determines which drop effect to use for the given event. In Internet Explorer we have to
* ignore the effectAllowed field on dataTransfer, since we set a fake value in dragstart.
* In those cases we rely on dndState to filter effects. Read the design doc for more details:
* https://github.com/marceljuenemann/angular-drag-and-drop-lists/wiki/Data-Transfer-Design
*/
function getDropEffect(event, ignoreDataTransfer) {
var effects = ALL_EFFECTS;
if (!ignoreDataTransfer) {
effects = filterEffects(effects, event.dataTransfer.effectAllowed);
}
if (dndState.isDragging) {
effects = filterEffects(effects, dndState.effectAllowed);
}
if (attr.dndEffectAllowed) {
effects = filterEffects(effects, attr.dndEffectAllowed);
}
// MacOS automatically filters dataTransfer.effectAllowed depending on the modifier keys,
// therefore the following modifier keys will only affect other operating systems.
if (!effects.length) {
return 'none';
} else if (event.ctrlKey && effects.indexOf('copy') != -1) {
return 'copy';
} else if (event.altKey && effects.indexOf('link') != -1) {
return 'link';
} else {
return effects[0];
}
}
/**
* Small helper function that cleans up if we aborted a drop.
*/
function stopDragover() {
placeholder.remove();
element.removeClass("dndDragover");
return true;
}
/**
* Invokes a callback with some interesting parameters and returns the callbacks return value.
*/
function invokeCallback(expression, event, dropEffect, itemType, index, item) {
return $parse(expression)(scope, {
callback: dndState.callback,
dropEffect: dropEffect,
event: event,
external: !dndState.isDragging,
index: index !== undefined ? index : getPlaceholderIndex(),
item: item || undefined,
type: itemType
});
}
/**
* We use the position of the placeholder node to determine at which position of the array the
* object needs to be inserted
*/
function getPlaceholderIndex() {
return Array.prototype.indexOf.call(listNode.children, placeholderNode);
}
/**
* Tries to find a child element that has the dndPlaceholder class set. If none was found, a
* new li element is created.
*/
function getPlaceholderElement() {
var placeholder;
angular.forEach(element.children(), function (childNode) {
var child = angular.element(childNode);
if (child.hasClass('dndPlaceholder')) {
placeholder = child;
}
});
return placeholder || angular.element("<li class='dndPlaceholder'></li>");
}
};
}]);
/**
* Use the dnd-nodrag attribute inside of dnd-draggable elements to prevent them from starting
* drag operations. This is especially useful if you want to use input elements inside of
* dnd-draggable elements or create specific handle elements. Note: This directive does not work
* in Internet Explorer 9.
*/
dndLists.directive('dndNodrag', function () {
return function (scope, element, attr) {
// Set as draggable so that we can cancel the events explicitly
element.attr("draggable", "true");
/**
* Since the element is draggable, the browser's default operation is to drag it on dragstart.
* We will prevent that and also stop the event from bubbling up.
*/
element.on('dragstart', function (event) {
event = event.originalEvent || event;
if (!event._dndHandle) {
// If a child element already reacted to dragstart and set a dataTransfer object, we will
// allow that. For example, this is the case for user selections inside of input elements.
if (!(event.dataTransfer.types && event.dataTransfer.types.length)) {
event.preventDefault();
}
event.stopPropagation();
}
});
/**
* Stop propagation of dragend events, otherwise dnd-moved might be triggered and the element
* would be removed.
*/
element.on('dragend', function (event) {
event = event.originalEvent || event;
if (!event._dndHandle) {
event.stopPropagation();
}
});
};
});
/**
* Use the dnd-handle directive within a dnd-nodrag element in order to allow dragging with that
* element after all. Therefore, by combining dnd-nodrag and dnd-handle you can allow
* dnd-draggable elements to only be dragged via specific "handle" elements. Note that Internet
* Explorer will show the handle element as drag image instead of the dnd-draggable element. You
* can work around this by styling the handle element differently when it is being dragged. Use
* the CSS selector .dndDragging:not(.dndDraggingSource) [dnd-handle] for that.
*/
dndLists.directive('dndHandle', function () {
return function (scope, element, attr) {
element.attr("draggable", "true");
element.on('dragstart dragend', function (event) {
event = event.originalEvent || event;
event._dndHandle = true;
});
};
});
/**
* Filters an array of drop effects using a HTML5 effectAllowed string.
*/
function filterEffects(effects, effectAllowed) {
if (effectAllowed == 'all') return effects;
return effects.filter(function (effect) {
return effectAllowed.toLowerCase().indexOf(effect) != -1;
});
}
/**
* For some features we need to maintain global state. This is done here, with these fields:
* - callback: A callback function set at dragstart that is passed to internal dropzone handlers.
* - dropEffect: Set in dragstart to "none" and to the actual value in the drop handler. We don't
* rely on the dropEffect passed by the browser, since there are various bugs in Chrome and
* Safari, and Internet Explorer defaults to copy if effectAllowed is copyMove.
* - effectAllowed: Set in dragstart based on dnd-effect-allowed. This is needed for IE because
* setting effectAllowed on dataTransfer might result in an undesired cursor.
* - isDragging: True between dragstart and dragend. Falsy for drops from external sources.
* - itemType: The item type of the dragged element set via dnd-type. This is needed because IE
* and Edge don't support custom mime types that we can use to transfer this information.
*/
var dndState = {};
})(angular.module('dndLists', []))
});