/// <summary>
/// Fire event about updates
/// </summary>
/// <param name="updateargs">
/// update arguments contains three fields UpdateType(Add/Remove), first new item pos, last new item pos</param>
internal void RiseUpdate(UpdateArgs updateargs)
{
EventHandler<UpdateArgs> handler = Updated;
if (updateargs.updateType == UpdateType.Nothing) return;
if (handler != null)
{
Updated(this, updateargs);
}
}
/// <summary>
/// Get latest news
/// </summary>
/// <returns></returns>
public override async Task GetLatest()
{
Buisy = true;
//get oldest news by offset parametr
VKResponse<NewsFeedContainer> newitems = await this.provider.Call<VKResponse<NewsFeedContainer>>("newsfeed.get", new Dictionary<string, string>
{
{
"start_time", (this.newsfeed.items[0].date+1).ToString()
}
});
if (newitems == null)
{
Buisy = false;
return;
}
var last = newsfeed.items[0];
var last1 = newsfeed.items[1];
newitems.response.items.RemoveAll(it => (it.post_id == last.post_id) || (it.post_id == last1.post_id));
//update offset
if (newitems.response.new_from != "0")
newsfeed.new_from = newitems.response.new_from;
//update data
newitems.response.items.RemoveAll((i) => i.post_id == last.post_id);
newsfeed.items.InsertRange(0, newitems.response.items);
newsfeed.Groups.UnionWith(newitems.response.groups);
newsfeed.Profiles.UnionWith(newitems.response.profiles);
//configure update information
if (newitems.response.items.Count != 0)
{
UpdateArgs args = new UpdateArgs
{
updateType = UpdateType.GetLatest,
first = 0,
last = newitems.response.items.Count - 1
};
//if nothing new set update type to nothing
if (newitems.response.items.Count == 0) args.updateType = UpdateType.Nothing;
RiseUpdate(args);
}
Buisy = false;
}
/// <summary>
/// Get oldest news
/// </summary>
/// <returns></returns>
public override async Task GetOldest()
{
Buisy = true;
//get lattest news by offset parametr
int oldcount = this.newsfeed.items.Count;
VKResponse<NewsFeedContainer> newitems = await this.provider.Call<VKResponse<NewsFeedContainer>>("newsfeed.get", new Dictionary<string, string>
{
{ "offset", oldcount.ToString()}
});
if (newitems == null) return;
NewsFeedContainer olddata = newitems.response;
//update offset
newsfeed.new_from = olddata.new_from;
newsfeed.new_offset = olddata.new_offset;
//update data
newsfeed.items.AddRange(olddata.items);
newsfeed.Groups.UnionWith(olddata.groups);
newsfeed.Profiles.UnionWith(olddata.profiles);
//configure update args
UpdateArgs args = new UpdateArgs
{
updateType = UpdateType.GetOldest,
last = newsfeed.items.Count-1,
first = newsfeed.items.Count-olddata.items.Count
};
RiseUpdate(args);
Buisy = false;
}
/// <summary>
/// Get NewsFeed
/// </summary>
/// <returns></returns>
public override async Task FirstTimeDownload()
{
Buisy = true;
System.Diagnostics.Debug.WriteLine("Newsfeed download started");
//resieve all latest news items
VKResponse<NewsFeedContainer> newitems = await this.provider.Call<VKResponse<NewsFeedContainer>>("newsfeed.get", new Dictionary<string, string>());
if (newitems == null) return;
//add it to ste responce
this.newsfeed = newitems.response;
this.newsfeed.Profiles.UnionWith(this.newsfeed.profiles);
this.newsfeed.Groups.UnionWith(this.newsfeed.groups);
//configure update arguments
UpdateArgs args = new UpdateArgs()
{
updateType = UpdateType.FirstTime,
first = 0,
last = newsfeed.items.Count()-1,
};
//rise update event
RiseUpdate(args);
Buisy = false;
}