private async void ListView_ItemSelected(object sender, SelectedItemChangedEventArgs e)
{
if (e.SelectedItem == null || !(e.SelectedItem is IWordViewModel))
{
return;
}
if (Pushing)
{
return;
}
try
{
Pushing = true;
await WordsPageSemaphore.WaitAsync();
if (!Pushing)
{
return;
}
if (this.Model.Words.Count > 300)
{
var page = new WordPage((IWordViewModel)e.SelectedItem);
await Navigation.PushAsync(page);
}
else
{
var page = WordsPage;
try
{
await page.CanPushSemaphore.WaitAsync();
page.SelectedItem = (IWordViewModel)e.SelectedItem;
if (page.Parent == null)
{
await Navigation.PushAsync(page);
}
}
finally
{
page.CanPushSemaphore.Release();
}
}
}
catch { }
finally
{
WordsPageSemaphore.Release();
Pushing = false;
}
(sender as ListView).SelectedItem = null;
}
public ProceedViewModel(WordPage p)
{
page = p;
if (p.BindingContext != null && p.BindingContext is IWordViewModel)
{
model = p.BindingContext as IWordViewModel;
model.PropertyChanged += (s, e) => this.OnPropertyChanged(nameof(Message));
}
if (model != null)
{
model.PropertyChanged += (s, e) =>
{
ProceedCommand?.OnCanExecuteChanged();
OnPropertyChanged(nameof(Message));
};
}
}