--- /dev/null
+/**
+ * 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-drop-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.dndDisableDropIf && scope.$eval(attr.dndDisableDropIf),
+ externalSources: attr.dndExternalSources && scope.$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', []));