UNPKG

openlayers

Version:

Build tools and sources for developing OpenLayers based mapping applications

247 lines (208 loc) 6.28 kB
// FIXME should listen on appropriate pane, once it is defined goog.provide('ol.control.MousePosition'); goog.require('ol'); goog.require('ol.events'); goog.require('ol.events.EventType'); goog.require('ol.Object'); goog.require('ol.control.Control'); goog.require('ol.proj'); /** * @classdesc * A control to show the 2D coordinates of the mouse cursor. By default, these * are in the view projection, but can be in any supported projection. * By default the control is shown in the top right corner of the map, but this * can be changed by using the css selector `.ol-mouse-position`. * * @constructor * @extends {ol.control.Control} * @param {olx.control.MousePositionOptions=} opt_options Mouse position * options. * @api stable */ ol.control.MousePosition = function(opt_options) { var options = opt_options ? opt_options : {}; var element = document.createElement('DIV'); element.className = options.className !== undefined ? options.className : 'ol-mouse-position'; var render = options.render ? options.render : ol.control.MousePosition.render; ol.control.Control.call(this, { element: element, render: render, target: options.target }); ol.events.listen(this, ol.Object.getChangeEventType(ol.control.MousePosition.Property.PROJECTION), this.handleProjectionChanged_, this); if (options.coordinateFormat) { this.setCoordinateFormat(options.coordinateFormat); } if (options.projection) { this.setProjection(ol.proj.get(options.projection)); } /** * @private * @type {string} */ this.undefinedHTML_ = options.undefinedHTML !== undefined ? options.undefinedHTML : ''; /** * @private * @type {string} */ this.renderedHTML_ = element.innerHTML; /** * @private * @type {ol.proj.Projection} */ this.mapProjection_ = null; /** * @private * @type {?ol.TransformFunction} */ this.transform_ = null; /** * @private * @type {ol.Pixel} */ this.lastMouseMovePixel_ = null; }; ol.inherits(ol.control.MousePosition, ol.control.Control); /** * Update the mouseposition element. * @param {ol.MapEvent} mapEvent Map event. * @this {ol.control.MousePosition} * @api */ ol.control.MousePosition.render = function(mapEvent) { var frameState = mapEvent.frameState; if (!frameState) { this.mapProjection_ = null; } else { if (this.mapProjection_ != frameState.viewState.projection) { this.mapProjection_ = frameState.viewState.projection; this.transform_ = null; } } this.updateHTML_(this.lastMouseMovePixel_); }; /** * @private */ ol.control.MousePosition.prototype.handleProjectionChanged_ = function() { this.transform_ = null; }; /** * Return the coordinate format type used to render the current position or * undefined. * @return {ol.CoordinateFormatType|undefined} The format to render the current * position in. * @observable * @api stable */ ol.control.MousePosition.prototype.getCoordinateFormat = function() { return /** @type {ol.CoordinateFormatType|undefined} */ ( this.get(ol.control.MousePosition.Property.COORDINATE_FORMAT)); }; /** * Return the projection that is used to report the mouse position. * @return {ol.proj.Projection|undefined} The projection to report mouse * position in. * @observable * @api stable */ ol.control.MousePosition.prototype.getProjection = function() { return /** @type {ol.proj.Projection|undefined} */ ( this.get(ol.control.MousePosition.Property.PROJECTION)); }; /** * @param {Event} event Browser event. * @protected */ ol.control.MousePosition.prototype.handleMouseMove = function(event) { var map = this.getMap(); this.lastMouseMovePixel_ = map.getEventPixel(event); this.updateHTML_(this.lastMouseMovePixel_); }; /** * @param {Event} event Browser event. * @protected */ ol.control.MousePosition.prototype.handleMouseOut = function(event) { this.updateHTML_(null); this.lastMouseMovePixel_ = null; }; /** * @inheritDoc * @api stable */ ol.control.MousePosition.prototype.setMap = function(map) { ol.control.Control.prototype.setMap.call(this, map); if (map) { var viewport = map.getViewport(); this.listenerKeys.push( ol.events.listen(viewport, ol.events.EventType.MOUSEMOVE, this.handleMouseMove, this), ol.events.listen(viewport, ol.events.EventType.MOUSEOUT, this.handleMouseOut, this) ); } }; /** * Set the coordinate format type used to render the current position. * @param {ol.CoordinateFormatType} format The format to render the current * position in. * @observable * @api stable */ ol.control.MousePosition.prototype.setCoordinateFormat = function(format) { this.set(ol.control.MousePosition.Property.COORDINATE_FORMAT, format); }; /** * Set the projection that is used to report the mouse position. * @param {ol.proj.Projection} projection The projection to report mouse * position in. * @observable * @api stable */ ol.control.MousePosition.prototype.setProjection = function(projection) { this.set(ol.control.MousePosition.Property.PROJECTION, projection); }; /** * @param {?ol.Pixel} pixel Pixel. * @private */ ol.control.MousePosition.prototype.updateHTML_ = function(pixel) { var html = this.undefinedHTML_; if (pixel && this.mapProjection_) { if (!this.transform_) { var projection = this.getProjection(); if (projection) { this.transform_ = ol.proj.getTransformFromProjections( this.mapProjection_, projection); } else { this.transform_ = ol.proj.identityTransform; } } var map = this.getMap(); var coordinate = map.getCoordinateFromPixel(pixel); if (coordinate) { this.transform_(coordinate, coordinate); var coordinateFormat = this.getCoordinateFormat(); if (coordinateFormat) { html = coordinateFormat(coordinate); } else { html = coordinate.toString(); } } } if (!this.renderedHTML_ || html != this.renderedHTML_) { this.element.innerHTML = html; this.renderedHTML_ = html; } }; /** * @enum {string} */ ol.control.MousePosition.Property = { PROJECTION: 'projection', COORDINATE_FORMAT: 'coordinateFormat' };