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InfoBox.js
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InfoBox.js
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import buildModuleUrl from "../../Core/buildModuleUrl.js";
import Check from "../../Core/Check.js";
import Color from "../../Core/Color.js";
import defined from "../../Core/defined.js";
import destroyObject from "../../Core/destroyObject.js";
import knockout from "../../ThirdParty/knockout.js";
import getElement from "../getElement.js";
import subscribeAndEvaluate from "../subscribeAndEvaluate.js";
import InfoBoxViewModel from "./InfoBoxViewModel.js";
/**
* A widget for displaying information or a description.
*
* @alias InfoBox
* @constructor
*
* @param {Element|String} container The DOM element or ID that will contain the widget.
*
* @exception {DeveloperError} Element with id "container" does not exist in the document.
*/
function InfoBox(container) {
//>>includeStart('debug', pragmas.debug);
Check.defined("container", container);
//>>includeEnd('debug')
container = getElement(container);
var infoElement = document.createElement("div");
infoElement.className = "cesium-infoBox";
infoElement.setAttribute(
"data-bind",
'\
css: { "cesium-infoBox-visible" : showInfo, "cesium-infoBox-bodyless" : _bodyless }'
);
container.appendChild(infoElement);
var titleElement = document.createElement("div");
titleElement.className = "cesium-infoBox-title";
titleElement.setAttribute("data-bind", "text: titleText");
infoElement.appendChild(titleElement);
var cameraElement = document.createElement("button");
cameraElement.type = "button";
cameraElement.className = "cesium-button cesium-infoBox-camera";
cameraElement.setAttribute(
"data-bind",
'\
attr: { title: "Focus camera on object" },\
click: function () { cameraClicked.raiseEvent(this); },\
enable: enableCamera,\
cesiumSvgPath: { path: cameraIconPath, width: 32, height: 32 }'
);
infoElement.appendChild(cameraElement);
var closeElement = document.createElement("button");
closeElement.type = "button";
closeElement.className = "cesium-infoBox-close";
closeElement.setAttribute(
"data-bind",
"\
click: function () { closeClicked.raiseEvent(this); }"
);
closeElement.innerHTML = "×";
infoElement.appendChild(closeElement);
var frame = document.createElement("iframe");
frame.className = "cesium-infoBox-iframe";
frame.setAttribute("sandbox", "allow-same-origin allow-popups allow-forms"); //allow-pointer-lock allow-scripts allow-top-navigation
frame.setAttribute(
"data-bind",
"style : { maxHeight : maxHeightOffset(40) }"
);
frame.setAttribute("allowfullscreen", true);
infoElement.appendChild(frame);
var viewModel = new InfoBoxViewModel();
knockout.applyBindings(viewModel, infoElement);
this._container = container;
this._element = infoElement;
this._frame = frame;
this._viewModel = viewModel;
this._descriptionSubscription = undefined;
var that = this;
//We can't actually add anything into the frame until the load event is fired
frame.addEventListener("load", function () {
var frameDocument = frame.contentDocument;
//We inject default css into the content iframe,
//end users can remove it or add their own via the exposed frame property.
var cssLink = frameDocument.createElement("link");
cssLink.href = buildModuleUrl("Widgets/InfoBox/InfoBoxDescription.css");
cssLink.rel = "stylesheet";
cssLink.type = "text/css";
//div to use for description content.
var frameContent = frameDocument.createElement("div");
frameContent.className = "cesium-infoBox-description";
frameDocument.head.appendChild(cssLink);
frameDocument.body.appendChild(frameContent);
//We manually subscribe to the description event rather than through a binding for two reasons.
//1. It's an easy way to ensure order of operation so that we can adjust the height.
//2. Knockout does not bind to elements inside of an iFrame, so we would have to apply a second binding
// model anyway.
that._descriptionSubscription = subscribeAndEvaluate(
viewModel,
"description",
function (value) {
// Set the frame to small height, force vertical scroll bar to appear, and text to wrap accordingly.
frame.style.height = "5px";
frameContent.innerHTML = value;
//If the snippet is a single element, then use its background
//color for the body of the InfoBox. This makes the padding match
//the content and produces much nicer results.
var background = null;
var firstElementChild = frameContent.firstElementChild;
if (
firstElementChild !== null &&
frameContent.childNodes.length === 1
) {
var style = window.getComputedStyle(firstElementChild);
if (style !== null) {
var backgroundColor = style["background-color"];
var color = Color.fromCssColorString(backgroundColor);
if (defined(color) && color.alpha !== 0) {
background = style["background-color"];
}
}
}
infoElement.style["background-color"] = background;
// Measure and set the new custom height, based on text wrapped above.
var height = frameContent.getBoundingClientRect().height;
frame.style.height = height + "px";
}
);
});
//Chrome does not send the load event unless we explicitly set a src
frame.setAttribute("src", "about:blank");
}
Object.defineProperties(InfoBox.prototype, {
/**
* Gets the parent container.
* @memberof InfoBox.prototype
*
* @type {Element}
*/
container: {
get: function () {
return this._container;
},
},
/**
* Gets the view model.
* @memberof InfoBox.prototype
*
* @type {InfoBoxViewModel}
*/
viewModel: {
get: function () {
return this._viewModel;
},
},
/**
* Gets the iframe used to display the description.
* @memberof InfoBox.prototype
*
* @type {HTMLIFrameElement}
*/
frame: {
get: function () {
return this._frame;
},
},
});
/**
* @returns {Boolean} true if the object has been destroyed, false otherwise.
*/
InfoBox.prototype.isDestroyed = function () {
return false;
};
/**
* Destroys the widget. Should be called if permanently
* removing the widget from layout.
*/
InfoBox.prototype.destroy = function () {
var container = this._container;
knockout.cleanNode(this._element);
container.removeChild(this._element);
if (defined(this._descriptionSubscription)) {
this._descriptionSubscription.dispose();
}
return destroyObject(this);
};
export default InfoBox;