private async Task <bool> RaisePageOnNavigatingFromAsync(MtPageDescription currentPage, MtPageDescription nextPage, NavigationMode mode)
{
var page = currentPage.GetPage(this);
var args = new MtNavigatingCancelEventArgs();
args.Content = page;
args.SourcePageType = currentPage.Type;
args.NavigationMode = mode;
args.Parameter = currentPage.Parameter;
await page.OnNavigatingFromCoreAsync(args);
if (!args.Cancel && nextPage != null)
{
var args2 = new MtNavigatingCancelEventArgs();
args2.SourcePageType = nextPage.Type;
args2.NavigationMode = mode;
args2.Parameter = nextPage.Parameter;
var copy = Navigating;
if (copy != null)
{
copy(this, args2);
args.Cancel = args2.Cancel;
}
}
return(args.Cancel);
}
internal virtual async Task OnNavigatingFromCoreAsync(MtNavigatingCancelEventArgs e)
{
OnNavigatingFrom(e);
var task = OnNavigatingFromAsync(e);
if (task != null)
{
await task;
}
}
protected internal virtual async Task OnNavigatingFromCoreAsync(MtNavigatingCancelEventArgs e)
{
#if DEBUG
Debug.WriteLine("1. OnNavigatingFrom:" + GetType().FullName);
#endif
OnNavigatingFrom(e);
var task = OnNavigatingFromAsync(e);
if (task != null)
{
await task;
}
}
private async Task <bool> RaisePageOnNavigatingFromAsync(MtPageDescription description, NavigationMode mode)
{
var page = description.GetPage(this);
var args = new MtNavigatingCancelEventArgs();
args.Content = page;
args.SourcePageType = description.Type;
args.NavigationMode = mode;
IsNavigating = true;
await page.OnNavigatingFromCoreAsync(args);
IsNavigating = false;
return(args.Cancel);
}
private void RootFrame_Navigating(object sender, MtNavigatingCancelEventArgs e)
{
_lastPageContent = this.RootFrame.Content;
var ui = _lastPageContent as FrameworkElement;
if (ui == null)
{
return;
}
var vm = ui.DataContext as NavigationViewModelBase;
if (vm == null)
{
return;
}
var args = new NavigatingFromEventArgs
{
Cancel = e.Cancel,
NavigationMode = e.NavigationMode,
Parameter = e.Parameter
};
vm.OnNavigatingFrom(args);
}
/// <summary>Called when navigating from this page.
/// The navigation does no happen until the returned task has completed.
/// Return null or empty task to run the method synchronously. </summary>
/// <param name="args">The event arguments. </param>
/// <returns>The task. </returns>
protected override Task OnNavigatingFromAsync(MtNavigatingCancelEventArgs args)
{
if (args.NavigationMode == NavigationMode.Back)
return Task.Delay(500);
return Task.Delay(0);
}
protected override void OnNavigatingFrom(MtNavigatingCancelEventArgs args)
{
MediaElement.Pause();
}
private async Task<bool> RaisePageOnNavigatingFromAsync(MtPageDescription description, NavigationMode mode)
{
var page = description.GetPage(this);
var args = new MtNavigatingCancelEventArgs();
args.Content = page;
args.SourcePageType = description.Type;
args.NavigationMode = mode;
IsNavigating = true;
await page.OnNavigatingFromCoreAsync(args);
IsNavigating = false;
return args.Cancel;
}
internal virtual async Task OnNavigatingFromCoreAsync(MtNavigatingCancelEventArgs e)
{
OnNavigatingFrom(e);
var task = OnNavigatingFromAsync(e);
if (task != null)
await task;
}
/// <summary>Called when navigating from this page.
/// The navigation does no happen until the returned task has completed.
/// Return null or empty task to run the method synchronously. </summary>
/// <param name="args">The event arguments. </param>
/// <returns>The task. </returns>
protected internal virtual Task OnNavigatingFromAsync(MtNavigatingCancelEventArgs args)
{
// Must be empty
return null;
}
/// <summary>Called when navigating from this page. </summary>
/// <param name="args">The event arguments. </param>
protected internal virtual void OnNavigatingFrom(MtNavigatingCancelEventArgs args)
{
// Must be empty
}
/// <summary>Called when navigating from this page.
/// The navigation does no happen until the returned task has completed.
/// Return null or empty task to run the method synchronously. </summary>
/// <param name="args">The event arguments. </param>
/// <returns>The task. </returns>
protected internal virtual Task OnNavigatingFromAsync(MtNavigatingCancelEventArgs args)
{
// Must be empty
return(null);
}
/// <summary>Called when navigating from this page. </summary>
/// <param name="args">The event arguments. </param>
protected internal virtual void OnNavigatingFrom(MtNavigatingCancelEventArgs args)
{
// Must be empty
}
protected internal virtual async Task OnNavigatingFromCoreAsync(MtNavigatingCancelEventArgs e)
{
#if DEBUG
Debug.WriteLine("1. OnNavigatingFrom:" + GetType().FullName);
#endif
OnNavigatingFrom(e);
var task = OnNavigatingFromAsync(e);
if (task != null)
await task;
}
private async Task<bool> RaisePageOnNavigatingFromAsync(MtPageDescription currentPage, MtPageDescription targetPage, NavigationMode mode)
{
var page = currentPage.GetPage(this);
var args = new MtNavigatingCancelEventArgs();
args.Content = page;
args.SourcePageType = currentPage.Type;
args.NavigationMode = mode;
args.Parameter = currentPage.Parameter;
await page.OnNavigatingFromCoreAsync(args);
if (!args.Cancel && targetPage != null)
{
var args2 = new MtNavigatingCancelEventArgs();
args2.SourcePageType = targetPage.Type;
args2.NavigationMode = mode;
args2.Parameter = targetPage.Parameter;
var copy = Navigating;
if (copy != null)
{
copy(this, args2);
args.Cancel = args2.Cancel;
}
}
return args.Cancel;
}
protected override void OnNavigatingFrom(MtNavigatingCancelEventArgs args)
{
SettingsPane.GetForCurrentView().CommandsRequested -= OnSettingsCommandsRequested;
}