protected override void OnTemplateApplied(TemplateAppliedEventArgs e)
{
TextView = e.NameScope.Find <TextView>("textView");
LogicalChildren.Add(TextView);
disposables.Add(TextDocumentProperty.Changed.Subscribe(args =>
{
if (args.NewValue != null)
{
// Todo unsubscribe these events.
TextDocument.Changing += (sender, ee) =>
{
TextDocument?.UndoStack.PushOptional(new RestoreCaretAndSelectionUndoAction(this));
if (BeforeTextChangedCommand != null)
{
BeforeTextChangedCommand.Execute(null);
}
};
TextDocument.Changed += (sender, ee) =>
{
InvalidateVisual();
LineHeight = TextView.CharSize.Height;
if (TextChangedCommand != null && TextChangedCommand.CanExecute(null))
{
TextChangedCommand.Execute(null);
}
};
}
}));
}
private void TextChangedDelayTimer_Tick(object sender, EventArgs e)
{
textChangedDelayTimer.Stop();
if (TextChangedCommand != null && TextChangedCommand.CanExecute(null))
{
TextChangedCommand.Execute(null);
}
}
public async void SearchBar_TextChanged(object sender, TextChangedEventArgs e)
{
if (HasFilterIcon)
{
var sbar = sender as Xamarin.Forms.SearchBar;
if (string.IsNullOrWhiteSpace(sbar?.Text))
{
iconFilter.TranslateTo(0, 0);
}
else
{
int transX = -25; //Good for Android
if (Device.RuntimePlatform == Device.iOS)
{
transX = -80; //Good for iOS
}
if (iconFilter.TranslationX != transX)
{
iconFilter.TranslateTo(transX, 0, 100);
}
}
}
if (TextChangedCommand != null)
{
if (cts != null)
{
cts.Cancel();
}
cts = new CancellationTokenSource();
var ctoken = cts.Token;
try
{
var millisDelay = TextChangedDelay > 0 ? TextChangedDelay : 650;
await Task.Delay(millisDelay, ctoken);
if (ctoken.IsCancellationRequested)
{
return;
}
if (TextChangedCommand.CanExecute(null))
{
TextChangedCommand?.Execute(null);
}
}
catch (OperationCanceledException)
{
// Expected
}
}
}
void OnTextChanged(object sender, TextChangedEventArgs e)
{
if (TextChangedCommand == null)
{
return;
}
var param = AssociatedObject.Text;
if (TextChangedCommand.CanExecute(param))
{
TextChangedCommand.Execute(param);
}
}
private void ExtendedSearchBar_TextChanged(object sender, TextChangedEventArgs e)
{
try
{
var param = TextChangedCommandParameter ?? e.NewTextValue;
if (TextChangedCommand != null && TextChangedCommand.CanExecute(param))
{
TextChangedCommand.Execute(param);
}
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
}
}
public SearchBar()
{
TextChanged += (e, a) =>
{
if (TextChangedCommand != null && TextChangedCommand.CanExecute(null))
{
TextChangedCommand.Execute(null);
}
};
TextChanged += (e, a) =>
{
if (AutoSearch)
{
if (SearchCommand != null && SearchCommand.CanExecute(null))
{
SearchCommand.Execute(null);
}
}
};
}