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