/// <summary>
/// Shows "Find location" popup page, lets the user enter text and returns the text.
/// </summary>
/// <returns>entered text, or null when user canceled the popup dialog</returns>
public static async Task <string> ShowAsync()
{
var popupPage = new FindLocationPopupPage
{
tcs = new TaskCompletionSource <string>()
};
await popupPage.Navigation.PushPopupAsync(popupPage);
return(await popupPage.tcs.Task);
}
/// <summary>
/// Called when toolbar button "Find location" was clicked
/// </summary>
/// <returns>task to wait on</returns>
private async Task OnClicked_ToolbarButtonFindLocation()
{
string text = await FindLocationPopupPage.ShowAsync();
if (string.IsNullOrWhiteSpace(text))
{
await this.DisplayAlert(
Constants.AppTitle,
"No location text was entered",
"Cancel");
return;
}
IEnumerable <Xamarin.Essentials.Location> foundLocationsList = null;
try
{
foundLocationsList = await Xamarin.Essentials.Geocoding.GetLocationsAsync(text);
}
catch (Exception ex)
{
// ignore exceptions and just log; assume that no location was found
App.LogError(ex);
}
if (foundLocationsList == null ||
!foundLocationsList.Any())
{
await this.DisplayAlert(
Constants.AppTitle,
"The location could not be found",
"OK");
return;
}
var location = foundLocationsList.First();
var point = new MapPoint(location.Latitude, location.Longitude, location.Altitude);
this.mapView.ShowFindResult(text, point);
}
