/// <summary>
/// Populates the page with content passed during navigation. Any saved state is also
/// provided when recreating a page from a prior session.
/// </summary>
/// <param name="navigationParameter">The parameter value passed to
/// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested.
/// </param>
/// <param name="pageState">A dictionary of state preserved by this page during an earlier
/// session. This will be null the first time a page is visited.</param>
protected override async void LoadState(Object navigationParameter, Dictionary <String, Object> pageState)
{
var storage = new MenuCardStorage();
MenuCardFactory.Instance.InitMenuCards(new ObservableCollection <MenuCard>(await storage.ReadMenuCardsAsync()));
this.DefaultViewModel["Items"] = MenuCardFactory.Instance.Cards;
}
/// <summary>
/// Populates the page with content passed during navigation. Any saved state is also
/// provided when recreating a page from a prior session.
/// </summary>
/// <param name="sender">
/// The source of the event; typically <see cref="NavigationHelper"/>
/// </param>
/// <param name="e">Event data that provides both the navigation parameter passed to
/// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested and
/// a dictionary of state preserved by this page during an earlier
/// session. The state will be null the first time a page is visited.</param>
private async void navigationHelper_LoadState(object sender, LoadStateEventArgs e)
{
this.DefaultViewModel["Commands"] = this;
var storage = new MenuCardStorage();
MenuCardRepository.Instance.InitMenuCards(new ObservableCollection <MenuCard>(
await storage.ReadMenuCardsAsync()));
this.DefaultViewModel["Items"] = MenuCardRepository.Instance.Cards;
}
/// <summary>
/// Populates the page with content passed during navigation. Any saved state is also
/// provided when recreating a page from a prior session.
/// </summary>
/// <param name="sender">
/// The source of the event; typically <see cref="NavigationHelper"/>
/// </param>
/// <param name="e">Event data that provides both the navigation parameter passed to
/// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested and
/// a dictionary of state preserved by this page during an earlier
/// session. The state will be null the first time a page is visited.</param>
private async void navigationHelper_LoadState(object sender, LoadStateEventArgs e)
{
this.DefaultViewModel["Commands"] = this;
var storage = new MenuCardStorage();
MenuCardRepository.Instance.InitMenuCards(new ObservableCollection <MenuCard>(
await storage.ReadMenuCardsAsync()));
cards = MenuCardRepository.Instance.Cards;
this.DefaultViewModel["Items"] = cards;
DataTransferManager.GetForCurrentView().DataRequested += OnShareDataRequested;
}
/// <summary>
/// 保留与此页关联的状态，以防挂起应用程序或
/// 从导航缓存中放弃此页。 值必须符合
/// <see cref="SuspensionManager.SessionState"/> 的序列化要求。
/// </summary>
///<param name="sender">事件的来源；通常为 <see cref="NavigationHelper"/></param>
///<param name="e">提供要使用可序列化状态填充的空字典
///的事件数据。</param>
///
// 退出页面时会调用 保存添加的Card
private async void navigationHelper_SaveState(object sender, SaveStateEventArgs e)
{
var mc = new MenuCard
{
Title = info.Title,
Description = info.Description,
Image = info.Image,
ImagePath = info.ImageFileName
};
MenuCardRepository.Instance.Cards.Add(mc);
var storage = new MenuCardStorage();
await storage.WriteMenuCardsAsync(MenuCardRepository.Instance.Cards.ToList());
}
/// <summary>
/// Preserves state associated with this page in case the application is suspended or the
/// page is discarded from the navigation cache. Values must conform to the serialization
/// requirements of <see cref="SuspensionManager.SessionState"/>.
/// </summary>
/// <param name="pageState">An empty dictionary to be populated with serializable state.</param>
protected async override void SaveState(Dictionary <String, Object> pageState)
{
var mc = new MenuCard
{
Title = info.Title,
Description = info.Description,
Image = info.Image,
ImagePath = info.ImageFileName
};
mc.SetDirty();
MenuCardFactory.Instance.Cards.Add(mc);
var storage = new MenuCardStorage();
await storage.WriteMenuCardsAsync(MenuCardFactory.Instance.Cards.ToList());
}
private async void OnSave(object sender, RoutedEventArgs e)
{
var picker = new FileSavePicker();
picker.DefaultFileExtension = ".xml";
picker.SuggestedFileName = string.Format("MenuCard {0}.xml", card.Title);
picker.SuggestedStartLocation = PickerLocationId.DocumentsLibrary;
picker.FileTypeChoices.Add("XML File", new List <string>()
{
".xml"
});
StorageFile file = await picker.PickSaveFileAsync();
MenuCardStorage storage = new MenuCardStorage();
await storage.WriteMenuCardToFileAsync(card, file);
}
private async void OnUploadImage(object sender, RoutedEventArgs e)
{
var filePicker = new FileOpenPicker();
filePicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
filePicker.FileTypeFilter.Add(".jpg");
filePicker.FileTypeFilter.Add(".png");
StorageFile file = await filePicker.PickSingleFileAsync();
if (file == null)
{
return;
}
var stream = await file.OpenAsync(FileAccessMode.Read);
var image = new BitmapImage();
image.SetSource(stream);
image.ImageOpened += async(sender1, e1) =>
{
if (image.PixelHeight > image.PixelWidth)
{
image.DecodePixelHeight = 900;
}
else
{
image.DecodePixelWidth = 900;
}
stream.Seek(0);
var imageStorage = new MenuCardImageStorage();
var storage = new MenuCardStorage();
info.ImageFileName = string.Format("{0}.jpg", Guid.NewGuid().ToString());
await imageStorage.WriteImageAsync(stream, info.ImageFileName);
};
image.ImageFailed += (sender1, e1) =>
{
string s = e1.ErrorMessage;
};
info.Image = image;
}
private async void OnSave()
{
Contract.Requires <InvalidOperationException>(card != null);
var picker = new FileSavePicker();
picker.DefaultFileExtension = ".xml";
picker.SuggestedFileName = string.Format("MenuCard {0}.xml", card.Title);
picker.SuggestedStartLocation = PickerLocationId.DocumentsLibrary;
picker.FileTypeChoices.Add("XML File", new List <string>()
{
".xml"
});
StorageFile file = await picker.PickSaveFileAsync();
var storage = new MenuCardStorage();
await storage.WriteMenuCardToFileAsync(card, file);
}
private static async Task InitSampleDataAsync()
{
var storage = new MenuCardStorage();
var imageStorage = new MenuCardImageStorage();
if (await storage.IsRoamingFolderEmpty())
{
List <MenuCard> menuCards = MenuCardRepository.GetSampleMenuCards().ToList();
foreach (var card in menuCards)
{
RandomAccessStreamReference streamRef =
RandomAccessStreamReference.CreateFromUri(new Uri(card.ImagePath));
using (IRandomAccessStreamWithContentType stream =
await streamRef.OpenReadAsync())
{
card.ImagePath = string.Format("{0}.png", Guid.NewGuid());
await imageStorage.WriteImageAsync(stream, card.ImagePath);
}
}
await storage.WriteMenuCardsAsync(menuCards);
}
}
