public MainViewModel(INavigationService navigationService, IRssService rssService)
{
this.navigationService = navigationService;
this.rssService = rssService;
this.FeedCategories = new ObservableCollection<RssFeed>
{
new RssFeed { Title = "Developer", RssUrl = @"http://blogs.esri.com/esri/arcgis/category/developer/feed" },
new RssFeed { Title = "ArcGIS Online", RssUrl = @"http://blogs.esri.com/esri/arcgis/category/arcgis-online/feed" },
new RssFeed { Title = "Editing", RssUrl = @"http://blogs.esri.com/esri/arcgis/category/editing/feed" },
new RssFeed { Title = "Mobile", RssUrl = @"http://blogs.esri.com/esri/arcgis/category/mobile/feed" },
new RssFeed { Title = "Mapping", RssUrl = @"http://blogs.esri.com/esri/arcgis/category/mapping/feed" },
new RssFeed { Title = "Analysis & Geoprocessing", RssUrl = @"http://blogs.esri.com/esri/arcgis/category/subject-analysis-and-geoprocessing/feed" },
new RssFeed { Title = "Services", RssUrl = @"http://blogs.esri.com/esri/arcgis/category/services/feed" },
new RssFeed { Title = "Web", RssUrl = @"http://blogs.esri.com/esri/arcgis/category/web/feed" },
new RssFeed { Title = "Geodata", RssUrl = @"http://blogs.esri.com/esri/arcgis/category/geodata/feed" },
new RssFeed { Title = "3D GIS", RssUrl = @"http://blogs.esri.com/esri/arcgis/category/subject-3d-gis/feed" },
new RssFeed { Title = "Imagery", RssUrl = @"http://blogs.esri.com/esri/arcgis/category/subject-imagery/feed" },
new RssFeed { Title = "Python", RssUrl = @"http://blogs.esri.com/esri/arcgis/category/subject-python/feed" }
};
this.LoadingText = string.Format("Loading feed...");
this.rssFeed = new RssFeed { RssUrl = FeedUrl, Title = "ArcGIS Blogs" };
if (!this.IsOffline)
{
this.LoadFeed();
}
}
public void LoadRssFeed(XDocument doc, RssFeed feed)
{
SetMediaImage(feed, doc);
feed.Description = doc.Root.Element("channel").GetSafeElementString("description");
feed.Items = new ObservableCollection<RssItem>();
feed.Link = doc.Root.Element("channel").GetSafeElementString("link");
foreach (var item in doc.Descendants("item"))
{
var newItem = new RssItem()
{
Title = item.GetSafeElementString("title"),
Link = item.GetSafeElementString("link"),
Description = item.GetSafeElementString("description"),
PublishDate = item.GetSafeElementDate("pubDate"),
Guid = item.GetSafeElementString("guid")
};
var content = item.Descendants(NS_RSSCONTENT + "encoded");
foreach (var xElement in content)
{
newItem.Content = xElement.Value;
}
feed.Items.Add(newItem);
}
var lastItem = feed.Items.OrderByDescending(i => i.PublishDate).FirstOrDefault();
if (lastItem != null)
{
feed.LastBuildDate = lastItem.PublishDate;
}
}
protected override void OnActivate()
{
if (ParameterSink.Parameter != null && ParameterSink.Parameter is RssFeed)
{
this.RssFeed = ParameterSink.Parameter as RssFeed;
if (!this.IsOffline)
{
this.LoadFeed();
}
}
base.OnActivate();
}
public RssFeed GetFeedDataFromReader(XmlReader reader)
{
var doc = XDocument.Load(reader);
var feed = new RssFeed();
var defaultNamespace = doc.Root.GetDefaultNamespace();
if (defaultNamespace.NamespaceName.EndsWith("Atom"))
{
LoadAtomFeed(doc, feed);
}
else
{
LoadRssFeed(doc, feed);
}
return feed;
}
public void LoadAtomFeed(XDocument doc, RssFeed feed)
{
SetMediaImage(feed, doc);
feed.Description = doc.Root.GetSafeElementString("summary");
feed.Items = new ObservableCollection<RssItem>();
feed.LastBuildDate = doc.Root.GetSafeElementDate("updated");
feed.Link = doc.Root.GetLink("self");
foreach (var item in doc.Root.Elements(doc.Root.GetDefaultNamespace() + "entry"))
{
var newItem = new RssItem()
{
Title = item.GetSafeElementString("title"),
Description = item.GetSafeElementString("description"),
PublishDate = item.GetSafeElementDate("published"),
Guid = item.GetSafeElementString("id"),
Link = item.GetLink("alternate")
};
feed.Items.Add(newItem);
}
}
public void NavigateToCategoryFeed(RssFeed selectedItem)
{
if (selectedItem == null)
{
return;
}
ParameterSink.Parameter = selectedItem;
this.navigationService.UriFor<RssCategoryFeedViewModel>().Navigate();
}
private void SetMediaImage(RssFeed feed, XDocument doc)
{
var image = doc.Root.Descendants(NS_ITUNES + "image").FirstOrDefault();
if (image != null)
{
feed.ImageUri = new Uri(image.Attribute("href").Value);
return;
}
var thumbnail = doc.Element(NS_MEDIA + "thumbnail");
if (thumbnail != null)
{
feed.ImageUri = new Uri(thumbnail.Value);
return;
}
// if all else fails...
feed.ImageUri = new Uri("/Resources/Images/RssFeed.png", UriKind.Relative);
}