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computeFlyToLocationForRectangle,
defined,
DeveloperError,
destroyObject,
Event,
GeocoderService,
GeocodeType,
getElement,
IonGeocoderService,
Math as CesiumMath,
Matrix4,
Rectangle,
sampleTerrainMostDetailed,
} from "@cesium/engine";
import knockout from "../ThirdParty/knockout.js";
import createCommand from "../createCommand.js";
// The height we use if geocoding to a specific point instead of an rectangle.
const DEFAULT_HEIGHT = 1000;
/**
* The view model for the {@link Geocoder} widget.
* @alias GeocoderViewModel
* @constructor
*
* @param {object} options Object with the following properties:
* @param {Scene} options.scene The Scene instance to use.
* @param {GeocoderService[]} [options.geocoderServices] Geocoder services to use for geocoding queries.
* If more than one are supplied, suggestions will be gathered for the geocoders that support it,
* and if no suggestion is selected the result from the first geocoder service wil be used.
* @param {number} [options.flightDuration] The duration of the camera flight to an entered location, in seconds.
* @param {Geocoder.DestinationFoundFunction} [options.destinationFound=GeocoderViewModel.flyToDestination] A callback function that is called after a successful geocode. If not supplied, the default behavior is to fly the camera to the result destination.
*/
function GeocoderViewModel(options) {
//>>includeStart('debug', pragmas.debug);
if (!defined(options) || !defined(options.scene)) {
throw new DeveloperError("options.scene is required.");
}
//>>includeEnd('debug');
if (defined(options.geocoderServices)) {
this._geocoderServices = options.geocoderServices;
} else {
this._geocoderServices = [new IonGeocoderService({ scene: options.scene })];
}
this._viewContainer = options.container;
this._scene = options.scene;
this._flightDuration = options.flightDuration;
this._searchText = "";
this._isSearchInProgress = false;
this._wasGeocodeCancelled = false;
this._previousCredits = [];
this._complete = new Event();
this._suggestions = [];
this._selectedSuggestion = undefined;
this._showSuggestions = true;
this._handleArrowDown = handleArrowDown;
this._handleArrowUp = handleArrowUp;
const that = this;
this._suggestionsVisible = knockout.pureComputed(function () {
const suggestions = knockout.getObservable(that, "_suggestions");
const suggestionsNotEmpty = suggestions().length > 0;
const showSuggestions = knockout.getObservable(that, "_showSuggestions")();
return suggestionsNotEmpty && showSuggestions;
});
this._searchCommand = createCommand(function (geocodeType) {
geocodeType = geocodeType ?? GeocodeType.SEARCH;
that._focusTextbox = false;
Iif (defined(that._selectedSuggestion)) {
that.activateSuggestion(that._selectedSuggestion);
return false;
}
that.hideSuggestions();
Iif (that.isSearchInProgress) {
cancelGeocode(that);
} else {
return geocode(that, that._geocoderServices, geocodeType);
}
});
this.deselectSuggestion = function () {
that._selectedSuggestion = undefined;
};
this.handleKeyDown = function (data, event) {
const downKey =
event.key === "ArrowDown" || event.key === "Down" || event.keyCode === 40;
const upKey =
event.key === "ArrowUp" || event.key === "Up" || event.keyCode === 38;
if (downKey || upKey) {
event.preventDefault();
}
return true;
};
this.handleKeyUp = function (data, event) {
const downKey =
event.key === "ArrowDown" || event.key === "Down" || event.keyCode === 40;
const upKey =
event.key === "ArrowUp" || event.key === "Up" || event.keyCode === 38;
const enterKey = event.key === "Enter" || event.keyCode === 13;
if (upKey) {
handleArrowUp(that);
} else if (downKey) {
handleArrowDown(that);
} else if (enterKey) {
that._searchCommand();
}
return true;
};
this.activateSuggestion = function (data) {
that.hideSuggestions();
that._searchText = data.displayName;
const destination = data.destination;
clearSuggestions(that);
that.destinationFound(that, destination);
};
this.hideSuggestions = function () {
that._showSuggestions = false;
that._selectedSuggestion = undefined;
};
this.showSuggestions = function () {
that._showSuggestions = true;
};
this.handleMouseover = function (data, event) {
if (data !== that._selectedSuggestion) {
that._selectedSuggestion = data;
}
};
/**
* Gets or sets a value indicating if this instance should always show its text input field.
*
* @type {boolean}
* @default false
*/
this.keepExpanded = false;
/**
* True if the geocoder should query as the user types to autocomplete
* @type {boolean}
* @default true
*/
this.autoComplete = options.autocomplete ?? true;
/**
* Gets and sets the command called when a geocode destination is found
* @type {Geocoder.DestinationFoundFunction}
*/
this.destinationFound =
options.destinationFound ?? GeocoderViewModel.flyToDestination;
this._focusTextbox = false;
knockout.track(this, [
"_searchText",
"_isSearchInProgress",
"keepExpanded",
"_suggestions",
"_selectedSuggestion",
"_showSuggestions",
"_focusTextbox",
]);
const searchTextObservable = knockout.getObservable(this, "_searchText");
searchTextObservable.extend({ rateLimit: { timeout: 500 } });
this._suggestionSubscription = searchTextObservable.subscribe(function () {
GeocoderViewModel._updateSearchSuggestions(that);
});
/**
* Gets a value indicating whether a search is currently in progress. This property is observable.
*
* @type {boolean}
*/
this.isSearchInProgress = undefined;
knockout.defineProperty(this, "isSearchInProgress", {
get: function () {
return this._isSearchInProgress;
},
});
/**
* Gets or sets the text to search for. The text can be an address, or longitude, latitude,
* and optional height, where longitude and latitude are in degrees and height is in meters.
*
* @type {string}
*/
this.searchText = undefined;
knockout.defineProperty(this, "searchText", {
get: function () {
Iif (this.isSearchInProgress) {
return "Searching...";
}
return this._searchText;
},
set: function (value) {
//>>includeStart('debug', pragmas.debug);
if (typeof value !== "string") {
throw new DeveloperError("value must be a valid string.");
}
//>>includeEnd('debug');
this._searchText = value;
},
});
/**
* Gets or sets the the duration of the camera flight in seconds.
* A value of zero causes the camera to instantly switch to the geocoding location.
* The duration will be computed based on the distance when undefined.
*
* @type {number|undefined}
* @default undefined
*/
this.flightDuration = undefined;
knockout.defineProperty(this, "flightDuration", {
get: function () {
return this._flightDuration;
},
set: function (value) {
//>>includeStart('debug', pragmas.debug);
if (defined(value) && value < 0) {
throw new DeveloperError("value must be positive.");
}
//>>includeEnd('debug');
this._flightDuration = value;
},
});
}
Object.defineProperties(GeocoderViewModel.prototype, {
/**
* Gets the event triggered on flight completion.
* @memberof GeocoderViewModel.prototype
*
* @type {Event}
*/
complete: {
get: function () {
return this._complete;
},
},
/**
* Gets the scene to control.
* @memberof GeocoderViewModel.prototype
*
* @type {Scene}
*/
scene: {
get: function () {
return this._scene;
},
},
/**
* Gets the Command that is executed when the button is clicked.
* @memberof GeocoderViewModel.prototype
*
* @type {Command}
*/
search: {
get: function () {
return this._searchCommand;
},
},
/**
* Gets the currently selected geocoder search suggestion
* @memberof GeocoderViewModel.prototype
*
* @type {object}
*/
selectedSuggestion: {
get: function () {
return this._selectedSuggestion;
},
},
/**
* Gets the list of geocoder search suggestions
* @memberof GeocoderViewModel.prototype
*
* @type {object[]}
*/
suggestions: {
get: function () {
return this._suggestions;
},
},
});
/**
* Destroys the widget. Should be called if permanently
* removing the widget from layout.
*/
GeocoderViewModel.prototype.destroy = function () {
this._suggestionSubscription.dispose();
};
function handleArrowUp(viewModel) {
Iif (viewModel._suggestions.length === 0) {
return;
}
const currentIndex = viewModel._suggestions.indexOf(
viewModel._selectedSuggestion,
);
if (currentIndex === -1 || currentIndex === 0) {
viewModel._selectedSuggestion = undefined;
return;
}
const next = currentIndex - 1;
viewModel._selectedSuggestion = viewModel._suggestions[next];
GeocoderViewModel._adjustSuggestionsScroll(viewModel, next);
}
function handleArrowDown(viewModel) {
Iif (viewModel._suggestions.length === 0) {
return;
}
const numberOfSuggestions = viewModel._suggestions.length;
const currentIndex = viewModel._suggestions.indexOf(
viewModel._selectedSuggestion,
);
const next = (currentIndex + 1) % numberOfSuggestions;
viewModel._selectedSuggestion = viewModel._suggestions[next];
GeocoderViewModel._adjustSuggestionsScroll(viewModel, next);
}
function computeFlyToLocationForCartographic(cartographic, terrainProvider) {
const availability = defined(terrainProvider)
? terrainProvider.availability
: undefined;
Eif (!defined(availability)) {
cartographic.height += DEFAULT_HEIGHT;
return Promise.resolve(cartographic);
}
return sampleTerrainMostDetailed(terrainProvider, [cartographic]).then(
function (positionOnTerrain) {
cartographic = positionOnTerrain[0];
cartographic.height += DEFAULT_HEIGHT;
return cartographic;
},
);
}
function flyToDestination(viewModel, destination) {
const scene = viewModel._scene;
const ellipsoid = scene.ellipsoid;
const camera = scene.camera;
const terrainProvider = scene.terrainProvider;
let finalDestination = destination;
let promise;
Iif (destination instanceof Rectangle) {
// Some geocoders return a Rectangle of zero width/height, treat it like a point instead.
if (
CesiumMath.equalsEpsilon(
destination.south,
destination.north,
CesiumMath.EPSILON7,
) &&
CesiumMath.equalsEpsilon(
destination.east,
destination.west,
CesiumMath.EPSILON7,
)
) {
// destination is now a Cartographic
destination = Rectangle.center(destination);
} else {
promise = computeFlyToLocationForRectangle(destination, scene);
}
} else {
// destination is a Cartesian3
destination = ellipsoid.cartesianToCartographic(destination);
}
Eif (!defined(promise)) {
promise = computeFlyToLocationForCartographic(destination, terrainProvider);
}
return promise
.then(function (result) {
finalDestination = ellipsoid.cartographicToCartesian(result);
})
.finally(function () {
// Whether terrain querying succeeded or not, fly to the destination.
camera.flyTo({
destination: finalDestination,
complete: function () {
viewModel._complete.raiseEvent();
},
duration: viewModel._flightDuration,
endTransform: Matrix4.IDENTITY,
});
});
}
async function attemptGeocode(geocoderService, query, geocodeType) {
try {
const result = await geocoderService.geocode(query, geocodeType);
return {
state: "fulfilled",
value: result,
credits: geocoderService.credit,
};
} catch (error) {
return { state: "rejected", reason: error };
}
}
async function geocode(viewModel, geocoderServices, geocodeType) {
const query = viewModel._searchText;
Iif (hasOnlyWhitespace(query)) {
viewModel.showSuggestions();
return;
}
viewModel._isSearchInProgress = true;
viewModel._wasGeocodeCancelled = false;
let i;
let result;
for (i = 0; i < geocoderServices.length; i++) {
Iif (viewModel._wasGeocodeCancelled) {
return;
}
result = await attemptGeocode(geocoderServices[i], query, geocodeType);
if (
defined(result) &&
result.state === "fulfilled" &&
result.value.length > 0
) {
break;
}
}
Iif (viewModel._wasGeocodeCancelled) {
return;
}
viewModel._isSearchInProgress = false;
clearCredits(viewModel);
const geocoderResults = result.value;
Eif (
result.state === "fulfilled" &&
defined(geocoderResults) &&
geocoderResults.length > 0
) {
viewModel._searchText = geocoderResults[0].displayName;
viewModel.destinationFound(viewModel, geocoderResults[0].destination);
const credits = updateCredits(
viewModel,
GeocoderService.getCreditsFromResult(geocoderResults[0]),
);
// If the result does not contain any credits, default to the service credit.
if (!defined(credits)) {
updateCredit(viewModel, geocoderServices[i].credit);
}
return;
}
viewModel._searchText = `${query} (not found)`;
}
function updateCredit(viewModel, credit) {
if (
defined(credit) &&
!viewModel._scene.isDestroyed() &&
!viewModel._scene.frameState.creditDisplay.isDestroyed()
) {
viewModel._scene.frameState.creditDisplay.addStaticCredit(credit);
viewModel._previousCredits.push(credit);
}
}
function updateCredits(viewModel, credits) {
if (defined(credits)) {
credits.forEach((credit) => updateCredit(viewModel, credit));
}
return credits;
}
function clearCredits(viewModel) {
if (
!viewModel._scene.isDestroyed() &&
!viewModel._scene.frameState.creditDisplay.isDestroyed()
) {
viewModel._previousCredits.forEach((credit) => {
viewModel._scene.frameState.creditDisplay.removeStaticCredit(credit);
});
}
viewModel._previousCredits.length = 0;
}
function adjustSuggestionsScroll(viewModel, focusedItemIndex) {
const container = getElement(viewModel._viewContainer);
const searchResults = container.getElementsByClassName("search-results")[0];
const listItems = container.getElementsByTagName("li");
const element = listItems[focusedItemIndex];
if (focusedItemIndex === 0) {
searchResults.scrollTop = 0;
return;
}
const offsetTop = element.offsetTop;
if (offsetTop + element.clientHeight > searchResults.clientHeight) {
searchResults.scrollTop = offsetTop + element.clientHeight;
} else if (offsetTop < searchResults.scrollTop) {
searchResults.scrollTop = offsetTop;
}
}
function cancelGeocode(viewModel) {
if (viewModel._isSearchInProgress) {
viewModel._isSearchInProgress = false;
viewModel._wasGeocodeCancelled = true;
}
}
function hasOnlyWhitespace(string) {
return /^\s*$/.test(string);
}
function clearSuggestions(viewModel) {
knockout.getObservable(viewModel, "_suggestions").removeAll();
}
async function updateSearchSuggestions(viewModel) {
Iif (!viewModel.autoComplete) {
return;
}
const query = viewModel._searchText;
clearSuggestions(viewModel);
clearCredits(viewModel);
if (hasOnlyWhitespace(query)) {
return;
}
for (const service of viewModel._geocoderServices) {
const newResults = await service.geocode(query, GeocodeType.AUTOCOMPLETE);
viewModel._suggestions = viewModel._suggestions.concat(newResults);
if (newResults.length > 0) {
let useDefaultCredit = true;
newResults.forEach((result) => {
const credits = GeocoderService.getCreditsFromResult(result);
useDefaultCredit = useDefaultCredit && !defined(credits);
updateCredits(viewModel, credits);
});
// Use the service credit if there were no attributions in the results
if (useDefaultCredit) {
updateCredit(viewModel, service.credit);
}
}
if (viewModel._suggestions.length >= 5) {
return;
}
}
}
/**
* A function to fly to the destination found by a successful geocode.
* @type {Geocoder.DestinationFoundFunction}
*/
GeocoderViewModel.flyToDestination = flyToDestination;
//exposed for testing
GeocoderViewModel._updateSearchSuggestions = updateSearchSuggestions;
GeocoderViewModel._adjustSuggestionsScroll = adjustSuggestionsScroll;
/**
* @returns {boolean} true if the object has been destroyed, false otherwise.
*/
GeocoderViewModel.prototype.isDestroyed = function () {
return false;
};
/**
* Destroys the widget. Should be called if permanently
* removing the widget from layout.
*/
GeocoderViewModel.prototype.destroy = function () {
clearCredits(this);
return destroyObject(this);
};
export default GeocoderViewModel;
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