protected virtual void LoadViewModel()
{
var iLoadableViewModel = ViewModel as ILoadableViewModel;
if (iLoadableViewModel == null)
{
return;
}
var refreshControl = new UIRefreshControl();
OnActivation(d => {
d(refreshControl.GetChangedObservable().Subscribe(_ => {
if (iLoadableViewModel.LoadCommand.CanExecute(null))
{
iLoadableViewModel.LoadCommand.ExecuteAsync()
.Subscribe(__ => refreshControl.EndRefreshing());
}
}));
d(iLoadableViewModel.LoadCommand.IsExecuting
.Where(x => x && !refreshControl.Refreshing).Subscribe(_ =>
{
nint rows = 0;
if (TableView.Source != null)
{
for (var i = 0; i < TableView.Source.NumberOfSections(TableView); i++)
{
rows += TableView.Source.RowsInSection(TableView, i);
}
}
if (rows == 0)
{
_loadingActivityView.Value.StartAnimating();
TableView.TableFooterView = _loadingActivityView.Value;
RefreshControl.Do(x => x.EndRefreshing());
RefreshControl = null;
}
}));
d(iLoadableViewModel.LoadCommand.IsExecuting
.Where(x => !x).Subscribe(_ =>
{
_loadingActivityView.Value.StopAnimating();
if (TableView.TableFooterView != null)
{
TableView.TableFooterView = null;
TableView.ReloadData();
}
if (RefreshControl == null)
{
RefreshControl = refreshControl;
}
}));
});
}
protected virtual void LoadViewModel()
{
var iLoadableViewModel = ViewModel as ILoadableViewModel;
var iPaginatableViewModel = ViewModel as IPaginatableViewModel;
if (iLoadableViewModel == null)
{
return;
}
var refreshControl = new UIRefreshControl();
refreshControl.ValueChanged += async(sender, e) => {
if (iLoadableViewModel.LoadCommand.CanExecute(null))
{
await iLoadableViewModel.LoadCommand.ExecuteAsync();
refreshControl.EndRefreshing();
}
};
iLoadableViewModel.LoadCommand.IsExecuting
.Where(x => x && !refreshControl.Refreshing).Subscribe(_ =>
{
nint rows = 0;
if (TableView.Source != null)
{
for (var i = 0; i < TableView.Source.NumberOfSections(TableView); i++)
{
rows += TableView.Source.RowsInSection(TableView, i);
}
}
if (rows == 0)
{
_loadingActivityView.Value.StartAnimating();
TableView.TableFooterView = _loadingActivityView.Value;
RefreshControl.Do(x => x.EndRefreshing());
RefreshControl = null;
}
});
iLoadableViewModel.LoadCommand.IsExecuting
.Where(x => !x).Subscribe(_ =>
{
_loadingActivityView.Value.StopAnimating();
if (TableView.TableFooterView != null)
{
TableView.TableFooterView = null;
TableView.ReloadData();
}
if (RefreshControl == null)
{
RefreshControl = refreshControl;
}
});
this.WhenActivated(d =>
{
var iSourceInformsEnd = TableView.Source as IInformsEnd;
if (iPaginatableViewModel != null && iSourceInformsEnd != null)
{
d(iSourceInformsEnd.RequestMore.Select(__ => iPaginatableViewModel.LoadMoreCommand).IsNotNull().Subscribe(async x =>
{
_loadingActivityView.Value.StartAnimating();
TableView.TableFooterView = _loadingActivityView.Value;
await x.ExecuteAsync();
TableView.TableFooterView = null;
_loadingActivityView.Value.StopAnimating();
}));
}
var iSourceInformsEmpty = TableView.Source as IInformsEmpty;
if (iSourceInformsEmpty != null)
{
d(iSourceInformsEmpty.IsEmpty.CombineLatest(iLoadableViewModel.LoadCommand.IsExecuting, (x, y) => x && !y)
.Where(_ => EmptyView != null)
.Subscribe(x =>
{
if (x)
{
if (EmptyView.Value.Superview == null)
{
EmptyView.Value.Alpha = 0f;
EmptyView.Value.Frame = new CGRect(0, 0, TableView.Bounds.Width, TableView.Bounds.Height * 2f);
TableView.AddSubview(EmptyView.Value);
UIView.Animate(0.2f, 0f, UIViewAnimationOptions.AllowUserInteraction | UIViewAnimationOptions.CurveEaseIn,
() => EmptyView.Value.Alpha = 1.0f, null);
}
}
else if (EmptyView.IsValueCreated)
{
EmptyView.Value.RemoveFromSuperview();
}
}));
}
});
}