/// <summary>
/// Populates the page with content passed during navigation. Any saved state is also
/// provided when recreating a page from a prior session.
/// </summary>
/// <param name="sender">
/// The source of the event; typically <see cref="NavigationHelper"/>
/// </param>
/// <param name="e">Event data that provides both the navigation parameter passed to
/// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested and
/// a dictionary of state preserved by this page during an earlier
/// session. The state will be null the first time a page is visited.</param>
private async void NavigationHelper_LoadState(object sender, LoadStateEventArgs e)
{
Debug.WriteLine("LoadState");
// If a hardware Back button is present, hide the "soft" Back button
// in the command bar, and register a handler for presses of the hardware
if (Windows.Foundation.Metadata.ApiInformation.IsTypePresent("Windows.Phone.UI.Input.HardwareButtons"))
{
HardwareButtons.BackPressed += HardwareButtons_BackPressed;
Debug.WriteLine("HWButtonTypeIsPresent");
}
//var localSettings = Windows.Storage.ApplicationData.Current.LocalSettings;
GeolocationAccessStatus status = await Geolocator.RequestAccessAsync();
if (status == GeolocationAccessStatus.Allowed)
{
settingsLink.Visibility = Visibility.Collapsed;
bool goToInitState = false;
//if a saved state is found, read the values and update the state
if (e.PageState != null)
{
if (e.PageState.ContainsKey("avg_start_position_lat") && (double)e.PageState["avg_start_position_lat"] != 0
&& e.PageState.ContainsKey("avg_start_position_lon") && (double)e.PageState["avg_start_position_lon"] != 0
&& e.PageState.ContainsKey("avg_start_position_alt") && e.PageState.ContainsKey("avg_start_position_accuracy")
&& e.PageState.ContainsKey("result_m") && e.PageState.ContainsKey("result_ft"))
{
// check if start position is too old
if (e.PageState.ContainsKey("start_position_timestamp"))
{
DateTime oldTime = new DateTime();
bool parseOK = DateTime.TryParse((string)e.PageState["start_position_timestamp"], out oldTime);
// if parse succesful, set timestamp, if not, set it to now
if (parseOK)
{
start_position_timestamp = oldTime;
}
else
{
start_position_timestamp = DateTime.Now;
}
long difference = DateTime.Now.Ticks - oldTime.Ticks;
TimeSpan differenceSpan = new TimeSpan(difference);
Debug.WriteLine("difference: " + differenceSpan.TotalHours + "h " + differenceSpan.TotalMinutes + "min " + differenceSpan.TotalSeconds + "sec");
if (differenceSpan.TotalHours < MAX_START_POSITION_AGE_IN_HOURS)
{
Debug.WriteLine("start_position not too old");
avg_start_position.Latitude = (double)e.PageState["avg_start_position_lat"];
avg_start_position.Longitude = (double)e.PageState["avg_start_position_lon"];
avg_start_position.Altitude = (double)e.PageState["avg_start_position_alt"];
avg_start_point_accuracy = (double)e.PageState["avg_start_position_accuracy"];
result_m = (double)e.PageState["result_m"];
result_ft = (double)e.PageState["result_ft"];
Debug.WriteLine("page state restored");
Debug.WriteLine("LoadState - result_m: " + result_m + " result_ft: " + result_ft);
progressBar.Visibility = Windows.UI.Xaml.Visibility.Visible;
statusLbl.Text = RESUMING;
setStartBtn.IsEnabled = false;
setGeolocatorToReportState();
}
else
{
// start position was too old ->
goToInitState = true;
}
}
}
else
{
goToInitState = true;
// avg start position is zero
//Debug.WriteLine("start position was zero");
}
}
// no saved state, launching first time
else
{
goToInitState = true;
Debug.WriteLine("no saved state, to init state");
}
if (goToInitState)
{
setGeolocatorToInitState(STARTING_GPS, true, true);
}
setLabels();
}
else
{
Debug.WriteLine("no location consent");
// The app is not allowed to location
setStartBtn.IsEnabled = false;
statusLbl.Text = LOCATION_OPTED_OUT;
settingsLink.Visibility = Visibility.Visible;
//var msg = new MessageDialog(LOCATION_CONSENT_QUESTION);
//var okBtn = new UICommand("yes", new UICommandInvokedHandler(CommandHandler));
//var cancelBtn = new UICommand("no", new UICommandInvokedHandler(CommandHandler));
//msg.Commands.Add(okBtn);
//msg.Commands.Add(cancelBtn);
//IUICommand result = await msg.ShowAsync();
}
}
/// <summary>
/// Populates the page with content passed during navigation. Any saved state is also
/// provided when recreating a page from a prior session.
/// </summary>
/// <param name="sender">
/// The source of the event; typically <see cref="NavigationHelper"/>
/// </param>
/// <param name="e">Event data that provides both the navigation parameter passed to
/// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested and
/// a dictionary of state preserved by this page during an earlier
/// session. The state will be null the first time a page is visited.</param>
private void NavigationHelper_LoadState(object sender, LoadStateEventArgs e)
{
}