private void PrismApplicationBase_ModalPopping(object sender, ModalPoppingEventArgs e)
{
if (PageNavigationService.NavigationSource == PageNavigationSource.Device)
{
_previousPage = PageUtilities.GetOnNavigatedToTarget(e.Modal, MainPage, true);
}
}
/// <summary>
/// Navigates to the most recent entry in the back navigation history by popping the calling Page off the navigation stack.
/// </summary>
/// <param name="parameters">The navigation parameters</param>
/// <param name="useModalNavigation">If <c>true</c> uses PopModalAsync, if <c>false</c> uses PopAsync</param>
/// <param name="animated">If <c>true</c> the transition is animated, if <c>false</c> there is no animation on transition.</param>
/// <returns>If <c>true</c> a go back operation was successful. If <c>false</c> the go back operation failed.</returns>
protected virtual async Task <INavigationResult> GoBackInternal(INavigationParameters parameters, bool?useModalNavigation, bool animated)
{
var result = new NavigationResult();
try
{
NavigationSource = PageNavigationSource.NavigationService;
var page = GetCurrentPage();
var segmentParameters = UriParsingHelper.GetSegmentParameters(null, parameters);
segmentParameters.GetNavigationParametersInternal().Add(KnownInternalParameters.NavigationMode, NavigationMode.Back);
var canNavigate = await PageUtilities.CanNavigateAsync(page, segmentParameters);
if (!canNavigate)
{
result.Exception = new Exception($"IConfirmNavigation for {page} returned false");
return(result);
}
bool useModalForDoPop = UseModalNavigation(page, useModalNavigation);
Page previousPage = PageUtilities.GetOnNavigatedToTarget(page, _applicationProvider.MainPage, useModalForDoPop);
PageUtilities.OnNavigatingTo(previousPage, segmentParameters);
await PageUtilitiesExtended.OnNavigatingToAsync(previousPage, segmentParameters);
var poppedPage = await DoPop(page.Navigation, useModalForDoPop, animated);
if (poppedPage != null)
{
PageUtilities.OnNavigatedFrom(page, segmentParameters);
PageUtilities.OnNavigatedTo(previousPage, segmentParameters);
PageUtilities.DestroyPage(poppedPage);
result.Success = true;
return(result);
}
}
catch (Exception ex)
{
_logger.Log(ex.ToString(), Category.Exception, Priority.High);
result.Exception = ex;
return(result);
}
finally
{
NavigationSource = PageNavigationSource.Device;
}
result.Exception = new Exception("Unknown error occured.");
return(result);
}
/// <summary>
/// Navigates to the most recent entry in the back navigation history by popping the calling Page off the navigation stack.
/// </summary>
/// <param name="parameters">The navigation parameters</param>
/// <param name="useModalNavigation">If <c>true</c> uses PopModalAsync, if <c>false</c> uses PopAsync</param>
/// <param name="animated">If <c>true</c> the transition is animated, if <c>false</c> there is no animation on transition.</param>
/// <returns>If <c>true</c> a go back operation was successful. If <c>false</c> the go back operation failed.</returns>
public virtual async Task <bool> GoBackAsync(NavigationParameters parameters = null, bool?useModalNavigation = null, bool animated = true)
{
try
{
NavigationSource = PageNavigationSource.NavigationService;
var page = GetCurrentPage();
var segmentParameters = UriParsingHelper.GetSegmentParameters(null, parameters);
segmentParameters.Add(KnownNavigationParameters.NavigationMode, NavigationMode.Back);
var canNavigate = await PageUtilities.CanNavigateAsync(page, segmentParameters);
if (!canNavigate)
{
return(false);
}
bool useModalForDoPop = UseModalNavigation(page, useModalNavigation);
Page previousPage = PageUtilities.GetOnNavigatedToTarget(page, _applicationProvider.MainPage, useModalForDoPop);
PageUtilities.OnNavigatingTo(previousPage, segmentParameters);
var poppedPage = await DoPop(page.Navigation, useModalForDoPop, animated);
if (poppedPage != null)
{
PageUtilities.OnNavigatedFrom(page, segmentParameters);
PageUtilities.OnNavigatedTo(previousPage, segmentParameters);
PageUtilities.DestroyPage(poppedPage);
return(true);
}
}
catch (Exception e)
{
_logger.Log(e.ToString(), Category.Exception, Priority.High);
return(false);
}
finally
{
NavigationSource = PageNavigationSource.Device;
}
return(false);
}