/// <summary>
/// Invoked when this page is about to be displayed in a Frame.
/// </summary>
/// <param name="e">Event data that describes how this page was reached. The Parameter
/// property provides the group to be displayed.</param>
protected override async Task OnNavigatedTo(AlternativeNavigationEventArgs e)
{
// Returning to a cached page through navigation shouldn't trigger state loading
if (_pageKey != null)
{
return;
}
var frameState = SuspensionManager.SessionStateForFrame(this.Frame);
_pageKey = "Page-" + this.Frame.BackStackDepth;
if (e.NavigationMode == NavigationMode.New)
{
// Clear existing state for forward navigation when adding a new page to the
// navigation stack
var nextPageKey = _pageKey;
int nextPageIndex = this.Frame.BackStackDepth;
while (frameState.Remove(nextPageKey))
{
nextPageIndex++;
nextPageKey = "Page-" + nextPageIndex;
}
// Pass the navigation parameter to the new page
this.LoadState(e.Parameter, null);
}
else
{
// Pass the navigation parameter and preserved page state to the page, using
// the same strategy for loading suspended state and recreating pages discarded
// from cache
this.LoadState(e.Parameter, (Dictionary <String, Object>)frameState[_pageKey]);
}
}
#pragma warning restore 1998
protected override async Task OnNavigatingTo(AlternativeNavigationEventArgs e)
{
_isPreloaded = false;
_parameter = (int)e.Parameter;
ParameterTextBlock.Text = "Parameter: " + _parameter;
await base.OnNavigatingTo(e);
}
#pragma warning disable 1998
protected override async Task OnNavigatedTo(AlternativeNavigationEventArgs e)
{
GC.Collect();
#pragma warning disable 4014
base.OnNavigatedTo(e);
#pragma warning restore 4014
}
#pragma warning disable 1998
/// <summary>
/// Invoked when this page will no longer be displayed in a Frame.
/// </summary>
/// <param name="e">Event data that describes how this page was reached. The Parameter
/// property provides the group to be displayed.</param>
protected override async Task OnNavigatedFrom(AlternativeNavigationEventArgs e)
{
var frameState = SuspensionManager.SessionStateForFrame(this.Frame);
var pageState = new Dictionary <String, Object>();
this.SaveState(pageState);
frameState[_pageKey] = pageState;
}
#pragma warning disable CS1998 // Async method lacks 'await' operators and will run synchronously
protected override async Task OnNavigatedToAsync(AlternativeNavigationEventArgs e)
#pragma warning restore CS1998 // Async method lacks 'await' operators and will run synchronously
{
GC.Collect();
#pragma warning disable 4014
base.OnNavigatedToAsync(e);
#pragma warning restore 4014
WindowTitleBar.SetText("WinRT XAML Toolkit Samples", true);
}
protected override Task OnNavigatedToAsync(AlternativeNavigationEventArgs e)
{
var title = e.Parameter as string;
WindowTitleBar.SetText("WinRT XAML Toolkit - " + title, true);
//this.TitleTextBlock.Text = title;
var sampleButton = MainPageViewModel.Instance.UngroupedSamples.First(s => s.Caption == title);
var content = (FrameworkElement)Activator.CreateInstance(sampleButton.ViewType);
this.ContentGrid.Children.Add(content);
AddHandler(Control.KeyDownEvent, new KeyEventHandler(TestPage_OnKeyDown), true);
Window.Current.CoreWindow.KeyDown += CoreWindow_KeyDown;
return(base.OnNavigatedToAsync(e));
}
protected override Task OnNavigatedFromAsync(AlternativeNavigationEventArgs e)
{
RemoveHandler(Control.KeyDownEvent, new KeyEventHandler(TestPage_OnKeyDown));
Window.Current.CoreWindow.KeyDown -= CoreWindow_KeyDown;
return(base.OnNavigatedFromAsync(e));
}
protected override async Task OnNavigatedTo(AlternativeNavigationEventArgs e)
{
await this.Frame.Preload(typeof(AlternativeFrameTestPageSubPage3), _parameter + 1);
}
protected override async Task OnNavigatedFromAsync(AlternativeNavigationEventArgs e)
{
await base.OnNavigatedFromAsync(e);
}
#pragma warning disable 1998
protected override async Task OnNavigatedTo(AlternativeNavigationEventArgs e)
{
GC.Collect();
base.OnNavigatedTo(e);
}
