97 lines
3.7 KiB
JavaScript
97 lines
3.7 KiB
JavaScript
/*****************************************************************************
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* Open MCT, Copyright (c) 2009-2016, 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 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 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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define(
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['../../TimelineConstants'],
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function (Constants) {
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/**
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* Handle for changing the start time of a timeline or
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* activity in the Timeline view.
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* @constructor
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* @param {string} id identifier of the domain object
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* @param {TimelineDragHandler} dragHandler the handler which
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* will update object state
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* @param {TimelineSnapHandler} snapHandler the handler which
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* provides candidate snap-to locations.
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*/
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function TimelineStartHandle(id, dragHandler, snapHandler) {
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var initialStart;
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// Get the snap-to location for a timestamp
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function snap(timestamp, zoom) {
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return snapHandler.snap(
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timestamp,
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zoom.toMillis(Constants.SNAP_WIDTH),
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id
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);
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}
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return {
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/**
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* Start dragging this handle.
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*/
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begin: function () {
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// Cache the initial state
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initialStart = dragHandler.start(id);
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},
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/**
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* Drag this handle.
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* @param {number} delta pixel delta from start
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* @param {TimelineZoomController} zoom provider of zoom state
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*/
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drag: function (delta, zoom) {
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if (initialStart !== undefined) {
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// Update the state
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dragHandler.start(
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id,
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snap(initialStart + zoom.toMillis(delta), zoom)
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);
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}
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},
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/**
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* Finish dragging this handle.
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*/
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finish: function () {
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// Clear initial state
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initialStart = undefined;
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// Persist changes
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dragHandler.persist();
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},
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/**
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* Get a style object (suitable for passing into `ng-style`)
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* for this handle.
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* @param {TimelineZoomController} zoom provider of zoom state
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*/
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style: function (zoom) {
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return {
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left: zoom.toPixels(dragHandler.start(id)) + 'px',
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width: Constants.HANDLE_WIDTH + 'px'
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};
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}
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};
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}
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return TimelineStartHandle;
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}
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);
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