99 lines
2.9 KiB
JavaScript
99 lines
2.9 KiB
JavaScript
// FIXME works for View2D only
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goog.provide('ol.control.Zoom');
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goog.require('goog.asserts');
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goog.require('goog.dom');
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goog.require('goog.dom.TagName');
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goog.require('goog.events');
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goog.require('goog.events.EventType');
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goog.require('ol.View2D');
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goog.require('ol.animation');
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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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* Create a new control with 2 buttons, one for zoom in and one for zoom out.
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* This control is part 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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* @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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* @todo stability experimental
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*/
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ol.control.Zoom = function(opt_options) {
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var options = goog.isDef(opt_options) ? opt_options : {};
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var className = goog.isDef(options.className) ? options.className : 'ol-zoom';
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var delta = goog.isDef(options.delta) ? options.delta : 1;
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var inElement = goog.dom.createDom(goog.dom.TagName.A, {
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'href': '#zoomIn',
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'class': className + '-in'
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});
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goog.events.listen(inElement, [
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goog.events.EventType.TOUCHEND,
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goog.events.EventType.CLICK
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], goog.partial(ol.control.Zoom.prototype.zoomByDelta_, delta), false, this);
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var outElement = goog.dom.createDom(goog.dom.TagName.A, {
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'href': '#zoomOut',
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'class': className + '-out'
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});
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goog.events.listen(outElement, [
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goog.events.EventType.TOUCHEND,
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goog.events.EventType.CLICK
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], goog.partial(ol.control.Zoom.prototype.zoomByDelta_, -delta), false, this);
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var cssClasses = className + ' ' + ol.css.CLASS_UNSELECTABLE;
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var element = goog.dom.createDom(goog.dom.TagName.DIV, cssClasses, inElement,
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outElement);
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goog.base(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_ = goog.isDef(options.duration) ? options.duration : 250;
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};
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goog.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 {goog.events.BrowserEvent} browserEvent The browser event to handle.
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* @private
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*/
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ol.control.Zoom.prototype.zoomByDelta_ = function(delta, browserEvent) {
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// prevent the anchor from getting appended to the url
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browserEvent.preventDefault();
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var map = this.getMap();
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// FIXME works for View2D only
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var view = map.getView();
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goog.asserts.assert(goog.isDef(view));
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var view2D = view.getView2D();
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goog.asserts.assertInstanceof(view2D, ol.View2D);
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var currentResolution = view2D.getResolution();
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if (goog.isDef(currentResolution)) {
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if (this.duration_ > 0) {
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map.beforeRender(ol.animation.zoom({
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resolution: currentResolution,
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duration: this.duration_,
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easing: ol.easing.easeOut
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}));
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}
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var newResolution = view2D.constrainResolution(currentResolution, delta);
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view2D.setResolution(newResolution);
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}
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};
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