private void NewsPaper_OnPaperDeleting(NewsPaper updatedNewspaper)
{
if (NewsPapers.Count == 1)
{
NewsPapers.Add(new NewsPaper("创建你的第一份报纸！"));
}
}
/// <summary>
/// 在将要挂起应用程序执行时调用。 在不知道应用程序
/// 无需知道应用程序会被终止还是会恢复，
/// 并让内存内容保持不变。
/// </summary>
/// <param name="sender">挂起的请求的源。</param>
/// <param name="e">有关挂起请求的详细信息。</param>
private void OnSuspending(object sender, SuspendingEventArgs e)
{
SaveFavoritesToFile();
NewsPaper.SaveAll();
Settings.SaveSettings();
var deferral = e.SuspendingOperation.GetDeferral();
//TODO: 保存应用程序状态并停止任何后台活动
deferral.Complete();
}
private async void SaveButton_Click(object sender, RoutedEventArgs e)
{
newsPaper = NewsPaper.NewsPapers.Find((NewsPaper paper) => paper.PaperTitle == News.PaperTitle);
//保存笔迹
var currentStrokes = newsCanvas.InkPresenter.StrokeContainer.GetStrokes(); //获取笔迹
byte[] serializedStrokes = await SerializeStrokes(currentStrokes); //序列化笔迹
News.InkStrokes = serializedStrokes; //将笔迹保存到新闻实例里
newsPaper.UpdateNewsList(News);
await NewsPaper.SaveToFile(newsPaper); //保存报纸
}
/// <summary>
/// 删除一张报纸
/// </summary>
/// <param name="newsPaper">要删除的报纸</param>
static async public Task DeleteNewsPaper(NewsPaper newsPaper)
{
OnPaperDeleting?.Invoke(newsPaper);
var paperListinFile = await ReadListFromFile();
//var index = paperListinFile.IndexOf(newsPaper.newsPaperModel);
paperListinFile.Remove(newsPaper.newsPaperModel);
NewsPapers.Remove(newsPaper);
//3、将paperListinFile重新保存到文件中
await FileIO.WriteBytesAsync(paperListFile, App.ObjectToByteArray(paperListinFile));
OnPaperDeleted?.Invoke(newsPaper);
}
private void NewsPaper_OnPaperAdded(NewsPaper updatedNewspaper)
{
if (PaperPage.thisPaperpage != null)
{
PaperPage.thisPaperpage.NavigationCacheMode = NavigationCacheMode.Disabled;
}
if (NewsPapers.Count == 1 && NewsPapers.First().PaperTitle == "创建你的第一份报纸！")
{
NewsPapers.Clear();
}
NewsPapers.Add(updatedNewspaper);
if (NewsPaper.NewsPapers.Count != 0)
{
paperNavigationView.SelectedItem = updatedNewspaper;
}
}
private async void GetNewsPapersAtBeginning()
{
await NewsPaper.ReadFromFile();
if (NewsPaper.NewsPapers.Count == 0)
{
NewsPapers.Add(new NewsPaper("创建你的第一份报纸！"));
}
//Bindings.Update();
//if(NewsPaper.NewsPapers.Add)
foreach (var paper in NewsPaper.NewsPapers)
{
NewsPapers.Add(paper);
}
paperNavigationView.SelectedItem = NewsPapers.First();
}
/// <summary>
/// 跳转到该页面时发生的方法
/// </summary>
/// <param name="e">要编辑的报纸</param>
protected override void OnNavigatedTo(NavigationEventArgs e)
{
if (e.Parameter is NewsPaper)
{
newsPaper = (NewsPaper)e.Parameter;
newspaperTitleTextBox.Text = newsPaper.PaperTitle;
foreach (var url in newsPaper.FeedUrls)
{
((TextBox)rssInputPanel.Children[rssInputPanel.Children.Count - 1]).Text = url.AbsoluteUri;
AddFeedButton_Click(null, null);
}
deleteButton.Visibility = Visibility.Visible;
isEditMode = true;
}
else
{
isEditMode = false;
}
}
/// <summary>
/// 保存到文件
/// </summary>
/// <param name="newsPaper"></param>
/// <returns>要保存的报纸</returns>
static public async Task SaveToFile(NewsPaper newsPaper)
{
//1、获取报纸列表
var paperListinFile = await ReadListFromFile();
bool existFlag;
//2、获取当前报纸编号
////2.1、如果文件中没有保存任何东西，则新建一个paperListinFile
if (paperListinFile == null)
{
paperListinFile = new List <NewsPaperModel>();
}
var index = paperListinFile.IndexOf(newsPaper.newsPaperModel);
////2.2、如果文件中没有保存此添加（是新报纸）
if (index == -1)
{
existFlag = false;
paperListinFile.Add(newsPaper.newsPaperModel);
}
////2.3、如果有则修改
else
{
existFlag = true;
//找到该报纸位置并替换掉 //to-do
paperListinFile[index] = newsPaper.newsPaperModel; //to-replace
}
////2.4若查到有多张报纸有相同名字，则显示错误
//3、将paperListinFile重新保存到文件中
await FileIO.WriteBytesAsync(paperListFile, App.ObjectToByteArray(paperListinFile));
if (!existFlag)
{
OnPaperSaved?.Invoke();
} //添加完成后引发该事件
}
/// <summary>
/// 保存按钮点击事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private async void SaveButton_Click(object sender, RoutedEventArgs e)
{
if (isEditMode)
{
List <Uri> editedUris = new List <Uri>();
string oldTitle = newsPaper.PaperTitle;
newsPaper.PaperTitle = newspaperTitleTextBox.Text;
//修改导航栏的标题
foreach (var element in rssInputPanel.Children)
{
try
{
var editedFeedUri = new Uri((element as TextBox).Text);
editedUris.Add(editedFeedUri);
}
catch (Exception)
{
continue;
}
}
var editedUrisEnumerables = newsPaper.FeedUrls.Union(editedUris).Intersect(editedUris);
var deletedUrisEnumerables = newsPaper.FeedUrls.Except(editedUrisEnumerables);
List <NewsItem> deletedNews = new List <NewsItem>();
foreach (var news in newsPaper.NewsList)
{
if (deletedUrisEnumerables.Contains(new Uri(news.Feed.Id)))
{
if (news.IsFavorite)
{
App.Favorites.Remove(new FavoriteModel(news));
}
deletedNews.Add(news);
}
}
//删除相应的订阅源
var deletedFeedModels = from feedModel in newsPaper.Feeds
where deletedUrisEnumerables.Contains(new Uri(feedModel.Id))
select feedModel;
var remainedFeedModel = newsPaper.Feeds.Except(deletedFeedModels);
newsPaper.Feeds = remainedFeedModel.ToList();
var remainedNewsEnumerables = newsPaper.NewsList.Except(deletedNews);
newsPaper.NewsList = new List <NewsItem>(remainedNewsEnumerables);
newsPaper.FeedUrls = new List <Uri>(editedUrisEnumerables);
foreach (var favNewsModel in App.Favorites)
{
if (favNewsModel.NewsPaperTitle == oldTitle)
{
favNewsModel.NewsPaperTitle = newsPaper.PaperTitle;
}
}
this.Frame.Navigate(typeof(PaperPage), newsPaper);
OnPaperEdited?.Invoke();
NewsPaper.SaveAll();
}
else
{
bool hasSameTitle = false;
foreach (var paper in NewsPaper.NewsPapers)
{
if (paper.PaperTitle == newspaperTitleTextBox.Text)
{
hasSameTitle = true;
break;
}
}
if (!hasSameTitle && //如果没有同名的报纸
newspaperTitleTextBox.Text != "") //并且如果名字不等与""
{
newsPaper = new NewsPaper(newspaperTitleTextBox.Text);
foreach (var element in rssInputPanel.Children)
{
try
{
newsPaper.AddFeedLink(new Uri((element as TextBox).Text));
}
catch (Exception)
{
continue;
}
}
NewsPaper.AddNewsPaper(newsPaper);
await NewsPaper.SaveToFile(newsPaper);
}
else
{
var dialog = new Windows.UI.Popups.MessageDialog("名字重复或为空");
await dialog.ShowAsync();
return;
}
}
Invoke(() =>
{
PaperPage.thisPaperpage.RefreshNews();
});
}
/// <summary>
/// 删除按钮
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private async void DeleteButton_Click(object sender, RoutedEventArgs e)
{
await NewsPaper.DeleteNewsPaper(newsPaper);
}
private void NewsPaper_OnPaperDeleted(NewsPaper newsPaper)
{
NewsPapers.Remove(newsPaper);
paperNavigationView.SelectedItem = NewsPapers.First();
}
/// <summary>
/// 添加报纸
/// </summary>
/// <param name="newsPaper"></param>
static public void AddNewsPaper(NewsPaper newsPaper)
{
OnPaperAdding?.Invoke(newsPaper);
NewsPapers.Add(newsPaper);
OnPaperAdded?.Invoke(newsPaper); //报纸添加后引发
}
