/// <summary>
/// Called when the Activity has detected the user's press of the back key
/// </summary>
public static async void OnBackPressed()
{
await semaphore.WaitAsync();
try
{
var container = ContainerLocator.Container;
var popupNavigation = container.Resolve <IPopupNavigation>();
var appProvider = container.Resolve <IApplicationProvider>();
var topPage = PopupUtilities.TopPage(popupNavigation, appProvider);
var navService = container.Resolve <INavigationService>(PrismApplicationBase.NavigationServiceName);
if (navService is IPageAware pa)
{
pa.Page = topPage;
}
var parameters = new NavigationParameters();
parameters.AddInternalParameter("_NavigationSource", "BackButton");
await navService.GoBackAsync(parameters);
}
finally
{
semaphore.Release();
}
}
private static void InvokeLifecyleEvent(PrismApplicationBase app, Action <IApplicationLifecycleAware> action)
{
if (app.MainPage != null)
{
var popupNavigation = app.Container.Resolve <IPopupNavigation>();
var appProvider = app.Container.Resolve <IApplicationProvider>();
var page = PopupUtilities.TopPage(popupNavigation, appProvider);
PageUtilities.InvokeViewAndViewModelAction(page, action);
}
}
protected override async Task <INavigationResult> GoBackInternal(INavigationParameters parameters, bool?useModalNavigation, bool animated)
{
INavigationResult result = null;
try
{
NavigationSource = PageNavigationSource.NavigationService;
switch (PopupUtilities.TopPage(_popupNavigation, _applicationProvider))
{
case PopupPage popupPage:
var segmentParameters = UriParsingHelper.GetSegmentParameters(null, parameters);
((INavigationParametersInternal)segmentParameters).Add("__NavigationMode", NavigationMode.Back);
var previousPage = PopupUtilities.GetOnNavigatedToTarget(_popupNavigation, _applicationProvider);
await DoPop(popupPage.Navigation, false, animated);
if (popupPage != null)
{
PageUtilities.InvokeViewAndViewModelAction <IActiveAware>(popupPage, a => a.IsActive = false);
PageUtilities.OnNavigatedFrom(popupPage, segmentParameters);
PageUtilities.OnNavigatedTo(previousPage, segmentParameters);
PageUtilities.InvokeViewAndViewModelAction <IActiveAware>(previousPage, a => a.IsActive = true);
PageUtilities.DestroyPage(popupPage);
result = new NavigationResult {
Success = true
};
break;
}
throw new NullReferenceException("The PopupPage was null following the Pop");
default:
result = await base.GoBackInternal(parameters, useModalNavigation, animated);
break;
}
}
catch (Exception e)
{
#if DEBUG
System.Diagnostics.Debugger.Break();
#endif
_logger.Log(e.ToString(), Category.Exception, Priority.High);
result = new NavigationResult {
Success = false, Exception = e
};;
}
finally
{
NavigationSource = PageNavigationSource.Device;
}
return(result);
}
public override async Task <INavigationResult> GoBackAsync(INavigationParameters parameters)
{
try
{
NavigationSource = PageNavigationSource.NavigationService;
switch (PopupUtilities.TopPage(_popupNavigation, _applicationProvider))
{
case PopupPage popupPage:
var segmentParameters = UriParsingHelper.GetSegmentParameters(null, parameters);
((INavigationParametersInternal)segmentParameters).Add("__NavigationMode", NavigationMode.Back);
var previousPage = PopupUtilities.GetOnNavigatedToTarget(_popupNavigation, _applicationProvider);
PageUtilities.OnNavigatingTo(previousPage, segmentParameters);
await DoPop(popupPage.Navigation, false, true);
if (popupPage != null)
{
PageUtilities.InvokeViewAndViewModelAction <IActiveAware>(popupPage, a => a.IsActive = false);
PageUtilities.OnNavigatedFrom(popupPage, segmentParameters);
PageUtilities.OnNavigatedTo(previousPage, segmentParameters);
PageUtilities.InvokeViewAndViewModelAction <IActiveAware>(previousPage, a => a.IsActive = true);
PageUtilities.DestroyPage(popupPage);
return(new NavigationResult {
Success = true
});
}
throw new NullReferenceException("The PopupPage was null following the Pop");
default:
return(await base.GoBackAsync(parameters));
}
}
catch (Exception e)
{
_logger.Log(e.ToString(), Category.Exception, Priority.High);
return(new NavigationResult {
Success = false, Exception = e
});;
}
finally
{
NavigationSource = PageNavigationSource.Device;
}
}
public override async Task <bool> GoBackAsync(INavigationParameters parameters = null, bool?useModalNavigation = default(bool?), bool animated = true)
{
try
{
NavigationSource = PageNavigationSource.NavigationService;
switch (PopupUtilities.TopPage(_popupNavigation, _applicationProvider))
{
case PopupPage popupPage:
var segmentParameters = UriParsingHelper.GetSegmentParameters(null, parameters);
segmentParameters.Add(KnownNavigationParameters.NavigationMode, NavigationMode.Back);
var previousPage = PopupUtilities.GetOnNavigatedToTarget(_popupNavigation, _applicationProvider);
PageUtilities.OnNavigatingTo(previousPage, segmentParameters);
await DoPop(popupPage.Navigation, false, animated);
if (popupPage != null)
{
PageUtilities.InvokeViewAndViewModelAction <IActiveAware>(popupPage, a => a.IsActive = false);
PageUtilities.OnNavigatedFrom(popupPage, segmentParameters);
PageUtilities.OnNavigatedTo(previousPage, segmentParameters);
PageUtilities.InvokeViewAndViewModelAction <IActiveAware>(previousPage, a => a.IsActive = true);
PageUtilities.DestroyPage(popupPage);
return(true);
}
break;
default:
return(await base.GoBackAsync(parameters, useModalNavigation, animated));
}
}
catch (Exception e)
{
_logger.Log(e.ToString(), Category.Exception, Priority.High);
return(false);
}
finally
{
NavigationSource = PageNavigationSource.Device;
}
return(false);
}