126 lines
4.9 KiB
JavaScript
126 lines
4.9 KiB
JavaScript
/*****************************************************************************
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* Open MCT Web, Copyright (c) 2014-2015, United States Government
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* as represented by the Administrator of the National Aeronautics and Space
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* Administration. All rights reserved.
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*
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* Open MCT Web is licensed under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0.
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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* Open MCT Web includes source code licensed under additional open source
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* licenses. See the Open Source Licenses file (LICENSES.md) included with
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* this source code distribution or the Licensing information page available
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* at runtime from the About dialog for additional information.
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*****************************************************************************/
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/*global define,Promise*/
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/**
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* Module defining DragGesture. Created by vwoeltje on 11/17/14.
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*/
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define(
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['./GestureConstants'],
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function (GestureConstants) {
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"use strict";
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/**
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* Add event handlers to a representation such that it may be
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* dragged as the source for drag-drop composition.
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*
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* @memberof platform/representation
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* @constructor
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* @param $log Angular's logging service
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* @param element the jqLite-wrapped element which should become
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* draggable
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* @param {DomainObject} domainObject the domain object which
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* is represented; this will be passed on drop.
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*/
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function DragGesture($log, dndService, element, domainObject) {
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function startDrag(e) {
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var event = (e || {}).originalEvent || e;
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$log.debug("Initiating drag");
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try {
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// Set the data associated with the drag-drop operation
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event.dataTransfer.effectAllowed = 'move';
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// Support drop as plain-text (JSON); not used internally
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event.dataTransfer.setData(
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'text/plain',
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JSON.stringify({
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id: domainObject.getId(),
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model: domainObject.getModel()
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})
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);
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// For internal use, pass the object's identifier as
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// part of the drag
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event.dataTransfer.setData(
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GestureConstants.MCT_DRAG_TYPE,
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domainObject.getId()
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);
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// Finally, also pass the id object instance via the
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// dndService, allowing inspection during drag as well
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// as retrieval of the original domain object.
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dndService.setData(
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GestureConstants.MCT_EXTENDED_DRAG_TYPE,
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domainObject
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);
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dndService.setData(
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GestureConstants.MCT_DRAG_TYPE,
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domainObject.getId()
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);
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} catch (err) {
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// Exceptions at this point indicate that the browser
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// do not fully support drag-and-drop (e.g. if
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// dataTransfer is undefined)
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$log.warn([
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"Could not initiate drag due to ",
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err.message
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].join(""));
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}
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}
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function endDrag() {
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// Clear the drag data after the drag is complete
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dndService.removeData(GestureConstants.MCT_DRAG_TYPE);
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dndService.removeData(GestureConstants.MCT_EXTENDED_DRAG_TYPE);
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}
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// Mark the element as draggable, and handle the dragstart event
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$log.debug("Attaching drag gesture");
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element.attr('draggable', 'true');
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element.on('dragstart', startDrag);
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element.on('dragend', endDrag);
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return {
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/**
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* Detach any event handlers associated with this gesture.
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* @memberof DragGesture
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* @method
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* @memberof platform/representation.DragGesture#
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*/
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destroy: function () {
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// Detach listener
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element.removeAttr('draggable');
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element.off('dragstart', startDrag);
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}
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};
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}
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return DragGesture;
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}
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);
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