{

/// <summary>

/// 可用于自身或导航至 Frame 内部的空白页。

/// </summary>

public sealed partial class TimeLine : Page

{

private const string Uri = "https://nmb.fastmirror.org/Api/timeline";

private static int _timeLinePage = 1;

private ObservableCollection<PostContent> _postContents;

/* The current structure:

* ContentStackPanel -> grid -> rootStackPanel -> infoStackPanel -> titleTextBlock

* | | -> nameTextBlock

* | | -> noTextBlock

* | |

* | -> contentStackPanel -> image

* | -> textBlock

* -> ...(same grid)

* -> ...

*/

public TimeLine()

{

InitializeComponent();

}

private string GetPostContent(string uri)

{

var httpClientHandler = new HttpClientHandler();

var httpClient = new HttpClient(httpClientHandler);

httpClientHandler.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;

var result = httpClient.GetStringAsync(uri).Result;

httpClient.Dispose();

return result;

}

private void Grid_Tapped(object sender, TappedRoutedEventArgs e)

{

Grid grid;

grid = sender as Grid;

if (grid != null)

{

var id =

(((grid.Children.ToList()[0] as StackPanel).Children.ToList()[0] as StackPanel).Children

.ToList()[2] as TextBlock).Text;

id = id.Replace("No.", "?id=");

_timeLinePage = 1;

Frame.Navigate(typeof(Thread), id);

}

}

protected override void OnNavigatedFrom(NavigationEventArgs e)

{

_postContents = null;

}

protected override void OnNavigatedTo(NavigationEventArgs e)

{

var result = GetPostContent(Uri);

_postContents =

new ObservableCollection<PostContent>(JsonConvert.DeserializeObject<List<PostContent>>(result));

ContentListView.ItemsSource = _postContents;

}

private void rootScrollViewer_ViewChanged(object sender, ScrollViewerViewChangedEventArgs e)

{

if ((sender as ScrollViewer).VerticalOffset == (sender as ScrollViewer).ScrollableHeight)

{

var newUri = $"{Uri}?page={++_timeLinePage}";

var result = GetPostContent(newUri);

foreach (var thread in new ObservableCollection<PostContent>(

JsonConvert.DeserializeObject<List<PostContent>>(result))) _postContents.Add(thread);

}

}

private void ShowMenu(bool isTransient, object sender)

{

var myOption = new FlyoutShowOptions();

myOption.ShowMode = isTransient ? FlyoutShowMode.Transient : FlyoutShowMode.Standard;

if (sender != null) CommandBarFlyout1.ShowAt(sender as Image, myOption);

}

private async void AppBarButton_Click(object sender, RoutedEventArgs e)

{

var newView = CoreApplication.CreateNewView();

var newViewId = 0;

var test = ((CommandBarFlyout1.Target as Image).GetValue(Image.SourceProperty) as BitmapImage).UriSource;

await newView.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>

{

var frame = new Frame();

frame.Navigate(typeof(ImageDetail), test);

Window.Current.Content = frame;

Window.Current.Activate();

newViewId = ApplicationView.GetForCurrentView().Id;

});

var viewShown = await ApplicationViewSwitcher.TryShowAsStandaloneAsync(newViewId);

}

private void AppBarButton_Click_1(object sender, RoutedEventArgs e)

{

var imageSave = new ImageSave();

ImageSave.SaveImage(((CommandBarFlyout1.Target as Image).GetValue(Image.SourceProperty) as BitmapImage)

.UriSource);

}

private void image_ContextRequested(UIElement sender, ContextRequestedEventArgs args)

{

ShowMenu(false, null);

}

private void image_Tapped(object sender, TappedRoutedEventArgs e)

{

ShowMenu(true, sender as Image);

e.Handled = true;

}

private async void ThreadWebview_NavigationCompleted(WebView sender, WebViewNavigationCompletedEventArgs args)

{

var webView = sender;

int width;

int height;

// get the total width and height

var widthString = await webView.InvokeScriptAsync("eval", new[] {"document.body.scrollWidth.toString()"});

var heightString = await webView.InvokeScriptAsync("eval", new[] {"document.body.scrollHeight.toString()"});

if (!int.TryParse(widthString, out width)) throw new Exception("Unable to get page width");

if (!int.TryParse(heightString, out height)) throw new Exception("Unable to get page height");

// resize the webview to the content

webView.Width = width;

webView.Height = height;

}

//private void contentStackPanel_Loading(FrameworkElement sender, object args)

//{

// StackPanel stackPanel = sender as StackPanel;

// WebView webView = new WebView();

// webView.MinWidth = 600;

// webView.DefaultBackgroundColor = new Windows.UI.Color { R = 255, G = 255, B = 255, A = 60 };

// webView.SetValue(WebViewEx.UriProperty, "<html><body>res</body></html>");

// stackPanel.Children.Add(webView);

//}

}

}