private void GoBackInternal()
{
var previousPage = this.backStack.Peek();
var previousPageType = previousPage.GetType();
// navigating from
var navigatingCancelEventArgs = new NavigatingCancelEventArgs(previousPageType, NavigationMode.Back);
this.CurrentPage.InternalOnNavigatingFrom(navigatingCancelEventArgs);
if (navigatingCancelEventArgs.Cancel)
{
return;
}
// navigated from
this.backStack.Pop();
this.visualRoot.Child = null;
this.CurrentPage.InternalOnNavigatedFrom(new NavigationEventArgs(previousPageType, null, NavigationMode.Back, true));
// navigation
this.visualRoot.Child = previousPage;
this.NativeShowPage(previousPage, NavigationMode.Back, this.modalIsDisplayed ? NavigationType.Modal : NavigationType.Default);
this.modalIsDisplayed = false;
this.CurrentPage = previousPage;
// navigated to
previousPage.InternalOnNavigatedTo(new NavigationEventArgs(previousPageType, null, NavigationMode.Back, true));
}
private void OnNavigating(NavigatingCancelEventArgs e)
{
if (this.Navigating != null)
{
this.Navigating(this, e);
}
}
#pragma warning disable 108
public void GoBack()
{
#if __ANDROID__ || WINDOWS_PHONE
if (this.IsNavigationInProgress)
{
return;
}
this.IsNavigationInProgress = true;
AppercodePage previosPage = this.BackStack.FirstOrDefault();
if (previosPage == null)
{
this.CloseApplication();
this.IsNavigationInProgress = false;
return;
}
Type previosPageType = previosPage.GetType();
// navigating from
NavigatingCancelEventArgs navigatingCancelEventArgs = new NavigatingCancelEventArgs(previosPageType, NavigationMode.Back);
this.CurrentPage.InternalOnNavigatingFrom(navigatingCancelEventArgs);
if (navigatingCancelEventArgs.Cancel == true)
{
this.IsNavigationInProgress = false;
return;
}
if(backStack.Count == 1)
{
this.NativeBackToTabs();
this.CurrentPage.InternalOnNavigatedFrom(new NavigationEventArgs(previosPageType, null, NavigationMode.Back, true));
this.CurrentPage = previosPage;
// navigated to
previosPage.InternalOnNavigatedTo(new NavigationEventArgs(previosPageType, null, NavigationMode.Back, true));
this.IsNavigationInProgress = false;
return;
}
// navigated from
this.backStack.Pop();
this.CurrentPage.InternalOnNavigatedFrom(new NavigationEventArgs(previosPageType, null, NavigationMode.Back, true));
// navigation
//this.visualRoot.Child = previosPage;
this.NativeShowPage(previosPage, NavigationMode.Back, false);
this.CurrentPage = previosPage;
// navigated to
previosPage.InternalOnNavigatedTo(new NavigationEventArgs(previosPageType, null, NavigationMode.Back, true));
this.IsNavigationInProgress = false;
#else
if (this.currentTabIndex < 0 || this.currentTabIndex >= this.navigationStacks.Count)
{
return;
}
this.navigationStacks[this.currentTabIndex].GoBack();
#endif
}
private object NavigateInternal(Type sourcePageType, object parameter, NavigationType navigationType)
{
this.IsNavigationInProgress = true;
// navigating from
if (this.CurrentPage != null)
{
var navigatingCancelEventArgs = new NavigatingCancelEventArgs(sourcePageType, NavigationMode.New);
this.CurrentPage.InternalOnNavigatingFrom(navigatingCancelEventArgs);
if (navigatingCancelEventArgs.Cancel)
{
this.IsNavigationInProgress = false;
return BooleanBoxes.FalseBox;
}
}
// navigated from
var navigationEventArgs = new NavigationEventArgs(sourcePageType, parameter);
if (this.CurrentPage != null)
{
this.CurrentPage.InternalOnNavigatedFrom(navigationEventArgs);
this.backStack.Push(this.CurrentPage);
}
// Create page
var pageConstructorInfo = sourcePageType.GetConstructor(new Type[] { });
AppercodePage pageInstance;
try
{
pageInstance = (AppercodePage)pageConstructorInfo.Invoke(new object[] { });
}
catch (TargetInvocationException e)
{
this.IsNavigationInProgress = false;
throw e.InnerException;
}
pageInstance.NavigationService = this.NavigationService;
this.visualRoot.Child = pageInstance;
this.NativeShowPage(pageInstance, NavigationMode.New, navigationType);
this.modalIsDisplayed |= navigationType == NavigationType.Modal;
// navigated to
pageInstance.InternalOnNavigatedTo(navigationEventArgs);
this.CurrentPage = pageInstance;
this.IsNavigationInProgress = false;
return BooleanBoxes.TrueBox;
}
private bool Navigate(Type sourcePageType, object parameter, bool isTabSwitching, NavigationType navigationType, AppercodePage tabPage = null)
{
#if __ANDROID__ || WINDOWS_PHONE
if (sourcePageType == null)
{
throw new ArgumentNullException("sourcePageType", "sourcePageType must not be null");
}
if (!sourcePageType.IsSubclassOf(typeof(AppercodePage)) && sourcePageType != typeof(AppercodePage))
{
throw new ArgumentException("sourcePageType must be an AppercodePage", "sourcePageType");
}
if (this.IsNavigationInProgress)
{
return false;
}
this.IsNavigationInProgress = true;
// navigating from with check
NavigatingCancelEventArgs navigatingCancelEventArgs = new NavigatingCancelEventArgs(sourcePageType, NavigationMode.New);
if (this.CurrentPage != null)
{
this.CurrentPage.InternalOnNavigatingFrom(navigatingCancelEventArgs);
if (navigatingCancelEventArgs.Cancel == true)
{
this.IsNavigationInProgress = false;
return false;
}
}
AppercodePage pageInstance;
// navigated from
if (this.CurrentPage != null)
{
this.CurrentPage.InternalOnNavigatedFrom(new NavigationEventArgs(sourcePageType, parameter));
this.backStack.Push(this.CurrentPage);
}
// Create page
if (isTabSwitching && backStack.Any())
{
this.backStack.Clear();
}
if (isTabSwitching && tabPage != null)
{
pageInstance = tabPage;
}
else
{
pageInstance = InstantiatePage(sourcePageType);
}
pageInstance.NavigationService = this.navigationService;
//this.visualRoot.Child = pageInstance;
this.NativeShowPage(pageInstance, NavigationMode.New, isTabSwitching);
// navigated to
pageInstance.InternalOnNavigatedTo(new NavigationEventArgs(sourcePageType, parameter));
this.CurrentPage = pageInstance;
this.IsNavigationInProgress = false;
return true;
#else
if (this.currentTabIndex < 0 || this.currentTabIndex >= this.navigationStacks.Count)
{
return false;
}
return this.navigationStacks[this.currentTabIndex].Navigate(sourcePageType, parameter, navigationType);
#endif
}
private bool Navigate(Type sourcePageType, object parameter, bool isTabSwitching, NavigationType navigationType, AppercodePage tabPage = null)
{
#if __ANDROID__ || WINDOWS_PHONE
if (sourcePageType == null)
{
throw new ArgumentNullException("sourcePageType", "sourcePageType must not be null");
}
if (!sourcePageType.IsSubclassOf(typeof(AppercodePage)) && sourcePageType != typeof(AppercodePage))
{
throw new ArgumentException("sourcePageType must be an AppercodePage", "sourcePageType");
}
if (this.IsNavigationInProgress)
{
return(false);
}
this.IsNavigationInProgress = true;
// navigating from with check
NavigatingCancelEventArgs navigatingCancelEventArgs = new NavigatingCancelEventArgs(sourcePageType, NavigationMode.New);
if (this.CurrentPage != null)
{
this.CurrentPage.InternalOnNavigatingFrom(navigatingCancelEventArgs);
if (navigatingCancelEventArgs.Cancel == true)
{
this.IsNavigationInProgress = false;
return(false);
}
}
AppercodePage pageInstance;
// navigated from
if (this.CurrentPage != null)
{
this.CurrentPage.InternalOnNavigatedFrom(new NavigationEventArgs(sourcePageType, parameter));
this.backStack.Push(this.CurrentPage);
}
// Create page
if (isTabSwitching && backStack.Any())
{
this.backStack.Clear();
}
if (isTabSwitching && tabPage != null)
{
pageInstance = tabPage;
}
else
{
pageInstance = InstantiatePage(sourcePageType);
}
pageInstance.NavigationService = this.navigationService;
//this.visualRoot.Child = pageInstance;
this.NativeShowPage(pageInstance, NavigationMode.New, isTabSwitching);
// navigated to
pageInstance.InternalOnNavigatedTo(new NavigationEventArgs(sourcePageType, parameter));
this.CurrentPage = pageInstance;
this.IsNavigationInProgress = false;
return(true);
#else
if (this.currentTabIndex < 0 || this.currentTabIndex >= this.navigationStacks.Count)
{
return(false);
}
return(this.navigationStacks[this.currentTabIndex].Navigate(sourcePageType, parameter, navigationType));
#endif
}
/// <summary>
/// Go to previous <see cref="AppercodePage"/>
/// </summary>
public void GoBack()
{
AppercodePage previosPage = this.BackStack.FirstOrDefault();
if (previosPage == null)
{
this.CloseApplication();
return;
}
Type previosPageType = previosPage.GetType();
// navigating from
NavigatingCancelEventArgs navigatingCancelEventArgs = new NavigatingCancelEventArgs(previosPageType, NavigationMode.Back);
this.CurrentPage.InternalOnNavigatingFrom(navigatingCancelEventArgs);
if (navigatingCancelEventArgs.Cancel == true)
{
return;
}
// navigated from
this.backStack.Pop();
this.visualRoot.Child = null;
this.CurrentPage.InternalOnNavigatedFrom(new NavigationEventArgs(previosPageType, null, NavigationMode.Back, true));
// navigation
this.visualRoot.Child = previosPage;
this.NativeShowPage(previosPage, NavigationMode.Back, this.modalIsDisplayed ? NavigationType.Modal : NavigationType.Default);
this.modalIsDisplayed = false;
this.CurrentPage = previosPage;
// navigated to
previosPage.InternalOnNavigatedTo(new NavigationEventArgs(previosPageType, null, NavigationMode.Back, true));
}
protected virtual void OnNavigatingFrom(NavigatingCancelEventArgs e)
{
}
internal void InternalOnNavigatingFrom(NavigatingCancelEventArgs e)
{
this.OnNavigatingFrom(e);
}