106 lines
2.3 KiB
JavaScript
106 lines
2.3 KiB
JavaScript
goog.provide('ol.control.Logo');
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goog.require('goog.dom');
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goog.require('goog.dom.TagName');
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goog.require('goog.object');
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goog.require('goog.style');
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goog.require('ol.FrameState');
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goog.require('ol.control.Control');
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goog.require('ol.css');
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/**
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* @constructor
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* @extends {ol.control.Control}
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* @param {ol.control.LogoOptions=} opt_options Logo options.
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*/
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ol.control.Logo = function(opt_options) {
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var options = goog.isDef(opt_options) ? opt_options : {};
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/**
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* @private
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* @type {Element}
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*/
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this.ulElement_ = goog.dom.createElement(goog.dom.TagName.UL);
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var element = goog.dom.createDom(goog.dom.TagName.DIV, {
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'class': 'ol-logo ' + ol.css.CLASS_UNSELECTABLE
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}, this.ulElement_);
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goog.base(this, {
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element: element,
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map: options.map,
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target: options.target
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});
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/**
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* @private
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* @type {boolean}
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*/
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this.renderedVisible_ = true;
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/**
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* @private
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* @type {Object.<string, Element>}
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*/
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this.logoElements_ = {};
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};
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goog.inherits(ol.control.Logo, ol.control.Control);
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/**
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* @param {ol.MapEvent} mapEvent Map event.
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*/
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ol.control.Logo.prototype.handleMapPostrender = function(mapEvent) {
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this.updateElement_(mapEvent.frameState);
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};
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/**
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* @param {?ol.FrameState} frameState Frame state.
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* @private
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*/
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ol.control.Logo.prototype.updateElement_ = function(frameState) {
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if (goog.isNull(frameState)) {
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if (this.renderedVisible_) {
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goog.style.showElement(this.element, false);
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this.renderedVisible_ = false;
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}
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return;
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}
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var logo;
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var logos = frameState.logos;
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var logoElements = this.logoElements_;
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for (logo in logoElements) {
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if (!(logo in logos)) {
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goog.dom.removeNode(logoElements[logo]);
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delete logoElements[logo];
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}
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}
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var image, logoElement;
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for (logo in logos) {
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if (!(logo in logoElements)) {
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image = new Image();
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image.src = logo;
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logoElement = goog.dom.createElement(goog.dom.TagName.LI);
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logoElement.appendChild(image);
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goog.dom.appendChild(this.ulElement_, logoElement);
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logoElements[logo] = logoElement;
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}
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}
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var renderVisible = !goog.object.isEmpty(logos);
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if (this.renderedVisible_ != renderVisible) {
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goog.style.showElement(this.element, renderVisible);
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this.renderedVisible_ = renderVisible;
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}
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};
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