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87 lines
3.9 KiB
JavaScript
87 lines
3.9 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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[],
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function () {
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/**
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* Control for Gantt bars in a timeline view.
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* Primarily reesponsible for supporting the positioning of Gantt
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* bars; particularly, this ensures that the left and right edges
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* never go to far off screen, because in some environments this
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* will effect rendering performance without visible results.
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* @constructor
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* @param {number} MAXIMUM_OFFSCREEN the maximum number of pixels
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* allowed to go off-screen (to either the left or the right)
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*/
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function TimelineGanttController(MAXIMUM_OFFSCREEN) {
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// Pixel position for the CSS left property
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function left(timespan, scroll, toPixels) {
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return Math.max(
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toPixels(timespan.getStart()),
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scroll.x - MAXIMUM_OFFSCREEN
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);
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}
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// Pixel value for the CSS width property
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function width(timespan, scroll, toPixels) {
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var x = left(timespan, scroll, toPixels),
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right = Math.min(
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toPixels(timespan.getEnd()),
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scroll.x + scroll.width + MAXIMUM_OFFSCREEN
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);
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return right - x;
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}
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return {
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/**
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* Get the pixel position for the `left` style property
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* of a Gantt bar for the specified timespan.
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* @param {Timespan} timespan the timespan to be represented
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* @param scroll an object containing an `x` and `width`
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* property, representing the scroll position and
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* visible width, respectively.
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* @param {Function} toPixels a function to convert
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* a timestamp to a pixel position
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* @returns {number} the pixel position of the left edge
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*/
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left: left,
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/**
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* Get the pixel value for the `width` style property
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* of a Gantt bar for the specified timespan.
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* @param {Timespan} timespan the timespan to be represented
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* @param scroll an object containing an `x` and `width`
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* property, representing the scroll position and
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* visible width, respectively.
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* @param {Function} toPixels a function to convert
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* a timestamp to a pixel position
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* @returns {number} the pixel width of this Gantt bar
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*/
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width: width
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};
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}
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return TimelineGanttController;
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}
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);
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