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Provide a static method in OpenSeadragon to get an existing viewer

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From limited testing, this method allows retrieval even when the viewer
was instantiated in a different file.

OpenSeadragon keeps internal private state in _viewers, following the
convention of the underscore prefix for private members.
This commit is contained in:
Hernán Cervera 2021-06-29 19:14:46 -05:00
parent fd85d5e22f
commit c639dd15e3
1 changed files with 23 additions and 1 deletions
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24
src/openseadragon.js
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@ -749,7 +749,9 @@
/* eslint-disable no-redeclare */
function OpenSeadragon( options ){
return new OpenSeadragon.Viewer( options );
var viewer = new OpenSeadragon.Viewer( options );
OpenSeadragon._viewers.set(viewer.element, viewer);
return viewer;
}
(function( $ ){
@ -1403,6 +1405,26 @@ function OpenSeadragon( options ){
CHROMEEDGE: 7
},
/**
* Keep track of which {@link Viewer}s have been created.
* - Key: {@link Element} to which a Viewer is attached.
* - Value: {@link Viewer} of the element defined by the key.
* @static
* @type {Object}
*/
// eslint-disable-next-line no-undef
_viewers: new Map(),
/**
* Returns the {@link Viewer} attached to a given DOM element. If there is
* no viewer attached to the provided element, undefined is returned.
* @function
* @param {String|Element} element Accepts an id or element.
* @returns {Viewer} The viewer attached to the given element, or undefined.
*/
getViewer: function(element) {
return $._viewers.get(this.getElement(element));
},
/**
* Returns a DOM Element for the given id or element.