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openlayers

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Build tools and sources for developing OpenLayers based mapping applications

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goog.provide('ol.control.Zoom'); goog.require('ol'); goog.require('ol.events'); goog.require('ol.events.EventType'); goog.require('ol.control.Control'); goog.require('ol.css'); goog.require('ol.easing'); /** * @classdesc * A control with 2 buttons, one for zoom in and one for zoom out. * This control is one of the default controls of a map. To style this control * use css selectors `.ol-zoom-in` and `.ol-zoom-out`. * * @constructor * @extends {ol.control.Control} * @param {olx.control.ZoomOptions=} opt_options Zoom options. * @api stable */ ol.control.Zoom = function(opt_options) { var options = opt_options ? opt_options : {}; var className = options.className !== undefined ? options.className : 'ol-zoom'; var delta = options.delta !== undefined ? options.delta : 1; var zoomInLabel = options.zoomInLabel !== undefined ? options.zoomInLabel : '+'; var zoomOutLabel = options.zoomOutLabel !== undefined ? options.zoomOutLabel : '\u2212'; var zoomInTipLabel = options.zoomInTipLabel !== undefined ? options.zoomInTipLabel : 'Zoom in'; var zoomOutTipLabel = options.zoomOutTipLabel !== undefined ? options.zoomOutTipLabel : 'Zoom out'; var inElement = document.createElement('button'); inElement.className = className + '-in'; inElement.setAttribute('type', 'button'); inElement.title = zoomInTipLabel; inElement.appendChild( typeof zoomInLabel === 'string' ? document.createTextNode(zoomInLabel) : zoomInLabel ); ol.events.listen(inElement, ol.events.EventType.CLICK, ol.control.Zoom.prototype.handleClick_.bind(this, delta)); var outElement = document.createElement('button'); outElement.className = className + '-out'; outElement.setAttribute('type', 'button'); outElement.title = zoomOutTipLabel; outElement.appendChild( typeof zoomOutLabel === 'string' ? document.createTextNode(zoomOutLabel) : zoomOutLabel ); ol.events.listen(outElement, ol.events.EventType.CLICK, ol.control.Zoom.prototype.handleClick_.bind(this, -delta)); var cssClasses = className + ' ' + ol.css.CLASS_UNSELECTABLE + ' ' + ol.css.CLASS_CONTROL; var element = document.createElement('div'); element.className = cssClasses; element.appendChild(inElement); element.appendChild(outElement); ol.control.Control.call(this, { element: element, target: options.target }); /** * @type {number} * @private */ this.duration_ = options.duration !== undefined ? options.duration : 250; }; ol.inherits(ol.control.Zoom, ol.control.Control); /** * @param {number} delta Zoom delta. * @param {Event} event The event to handle * @private */ ol.control.Zoom.prototype.handleClick_ = function(delta, event) { event.preventDefault(); this.zoomByDelta_(delta); }; /** * @param {number} delta Zoom delta. * @private */ ol.control.Zoom.prototype.zoomByDelta_ = function(delta) { var map = this.getMap(); var view = map.getView(); if (!view) { // the map does not have a view, so we can't act // upon it return; } var currentResolution = view.getResolution(); if (currentResolution) { var newResolution = view.constrainResolution(currentResolution, delta); if (this.duration_ > 0) { if (view.getAnimating()) { view.cancelAnimations(); } view.animate({ resolution: newResolution, duration: this.duration_, easing: ol.easing.easeOut }); } else { view.setResolution(newResolution); } } };