/// <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 async override void LoadState(Object navigationParameter, Dictionary<String, Object> pageState)
{
navParam = navigationParameter as postDate;
pageTitle.Text = "Posts for " + navParam.month_name + " " + navParam.year;
ViewCommentsButton.Visibility = Visibility.Collapsed;
progressRing.Visibility = Visibility.Visible;
Windows.UI.Xaml.Media.Animation.Storyboard sb =
this.FindName("PopInStoryBoard") as Windows.UI.Xaml.Media.Animation.Storyboard;
if (sb != null) sb.Begin();
// TODO: Assign a bindable group to this.DefaultViewModel["Group"]
// TODO: Assign a collection of bindable items to this.DefaultViewModel["Items"]
FeedDataSource feedDataSource = (FeedDataSource)App.Current.Resources["feedDataSource"];
if (feedDataSource != null)
{
await feedDataSource.GetFeedsAsync("date", navParam.year + navParam.month);
}
RootObject feedData = FeedDataSource.GetFeed();
if (feedData != null)
{
this.DefaultViewModel["Feed"] = feedData;
this.DefaultViewModel["Items"] = feedData.posts;
if (feedData.posts.Count == 0)
itemTitle.Text = "There are no posts yet.";
}
if (pageState == null)
{
// When this is a new page, select the first item automatically unless logical page
// navigation is being used (see the logical page navigation #region below.)
if (!this.UsingLogicalPageNavigation() && this.itemsViewSource.View != null)
{
this.itemsViewSource.View.MoveCurrentToFirst();
}
else
{
//this.itemsViewSource.View.MoveCurrentToPosition(-1);
}
}
else
{
// Restore the previously saved state associated with this page
if (pageState.ContainsKey("SelectedItem") && this.itemsViewSource.View != null)
{
// TODO: Invoke this.itemsViewSource.View.MoveCurrentTo() with the selected
// item as specified by the value of pageState["SelectedItem"]
string itemTitle = (string)pageState["SelectedItem"];
Post selectedItem = FeedDataSource.GetItem(itemTitle);
this.itemsViewSource.View.MoveCurrentTo(selectedItem);
}
}
if (feedData.posts.Count == 0)
ViewCommentsButton.Visibility = Visibility.Collapsed;
else ViewCommentsButton.Visibility = Visibility.Visible;
progressRing.Visibility = Visibility.Collapsed;
}
/// <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 async override void LoadState(Object navigationParameter, Dictionary <String, Object> pageState)
{
navParam = navigationParameter as postDate;
pageTitle.Text = "Posts for " + navParam.month_name + " " + navParam.year;
ViewCommentsButton.Visibility = Visibility.Collapsed;
progressRing.Visibility = Visibility.Visible;
Windows.UI.Xaml.Media.Animation.Storyboard sb =
this.FindName("PopInStoryBoard") as Windows.UI.Xaml.Media.Animation.Storyboard;
if (sb != null)
{
sb.Begin();
}
// TODO: Assign a bindable group to this.DefaultViewModel["Group"]
// TODO: Assign a collection of bindable items to this.DefaultViewModel["Items"]
FeedDataSource feedDataSource = (FeedDataSource)App.Current.Resources["feedDataSource"];
if (feedDataSource != null)
{
await feedDataSource.GetFeedsAsync("date", navParam.year + navParam.month);
}
RootObject feedData = FeedDataSource.GetFeed();
if (feedData != null)
{
this.DefaultViewModel["Feed"] = feedData;
this.DefaultViewModel["Items"] = feedData.posts;
if (feedData.posts.Count == 0)
{
itemTitle.Text = "There are no posts yet.";
}
}
if (pageState == null)
{
// When this is a new page, select the first item automatically unless logical page
// navigation is being used (see the logical page navigation #region below.)
if (!this.UsingLogicalPageNavigation() && this.itemsViewSource.View != null)
{
this.itemsViewSource.View.MoveCurrentToFirst();
}
else
{
//this.itemsViewSource.View.MoveCurrentToPosition(-1);
}
}
else
{
// Restore the previously saved state associated with this page
if (pageState.ContainsKey("SelectedItem") && this.itemsViewSource.View != null)
{
// TODO: Invoke this.itemsViewSource.View.MoveCurrentTo() with the selected
// item as specified by the value of pageState["SelectedItem"]
string itemTitle = (string)pageState["SelectedItem"];
Post selectedItem = FeedDataSource.GetItem(itemTitle);
this.itemsViewSource.View.MoveCurrentTo(selectedItem);
}
}
if (feedData.posts.Count == 0)
{
ViewCommentsButton.Visibility = Visibility.Collapsed;
}
else
{
ViewCommentsButton.Visibility = Visibility.Visible;
}
progressRing.Visibility = Visibility.Collapsed;
}
