public void OnBackButtonPress(object sender, BackButtonEventArgs e)
{
if (OnBackButton != null)
{
OnBackButton(sender, e);
}
}
private void Current_OnBackButton(object sender, BackButtonEventArgs e)
{
if (_viewModel.PickerIsOpen)
{
_viewModel.PickerIsOpen = false;
e.Cancel = true;
}
}
public bool OnBackPressed()
{
var args = new BackButtonEventArgs();
if (BackPressed != null)
{
BackPressed(args);
}
return(args.Handled);
}
public void HandleDelete(object sender, BackButtonEventArgs e)
{
var entry = sender as BorderlessEntry;
var entries = InputContainer.Children;
if (String.IsNullOrEmpty(e.OldValue) || (MostRecentBackPress != null && MostRecentBackPress.OldValue == e.OldValue))
{
FocusBack(entries, entry, true);
}
else
{
MostRecentBackPress = e;
}
}
protected override bool OnBackButtonPressed()
{
var args = new BackButtonEventArgs();
OnBackButton(args);
if (args.Cancel)
{
base.OnBackButtonPressed();
return(true);
}
else
{
return(false);
}
}
protected override void OnElementChanged(ElementChangedEventArgs <Entry> e)
{
if (Element == null)
{
return;
}
if (Control != null)
{
Control.Layer.BorderWidth = 0;
Control.BorderStyle = UITextBorderStyle.None;
Control.VerticalAlignment = UIControlContentVerticalAlignment.Center;
}
var entry = (BorderlessEntry)Element;
entry.TextChanged += (sender, ev) =>
{
OldValue = ev.OldTextValue;
NewValue = ev.NewTextValue;
};
var textField = new CustomTextField();
textField.EditingChanged += OnEditingChanged;
textField.OnDeleteBackwardKey += (sender, ev) =>
{
if (TheEvent != null)
{
if (OldValue == TheEvent.OldValue)
{
OldValue = "";
}
}
TheEvent = new BackButtonEventArgs(NewValue, OldValue);
entry.OnBackButtonPress(entry, TheEvent);
};
SetNativeControl(textField);
base.OnElementChanged(e);
if (Element.Keyboard != null && Element.Keyboard == Keyboard.Numeric)
{
AddDoneButton();
}
}
private void FocusBack(Grid.IGridList <View> entries, BorderlessEntry e, bool deleteValue = false)
{
MostRecentBackPress = null;
int index = entries.IndexOf(e);
if (index > -1 && (index - 1) >= 0)
{
var prev = (BorderlessEntry)entries.ElementAt(index - 1);
var input = prev.Text;
prev?.Focus();
if (deleteValue)
{
prev.Text = "";
MostRecentBackPress = new BackButtonEventArgs("", input);
}
}
}
protected override void OnElementChanged(ElementChangedEventArgs <Entry> e)
{
base.OnElementChanged(e);
if (e.OldElement == null)
{
Control.Background = null;
}
if (e.NewElement != null)
{
var entry = e.NewElement as BorderlessEntry;
((EditText)Control).KeyPress += (sender, ev) =>
{
ev.Handled = false;
if (ev.KeyCode == Keycode.Del)
{
if (TheEvent != null)
{
if (OldValue == TheEvent.OldValue)
{
OldValue = "";
}
}
TheEvent = new BackButtonEventArgs(NewValue, OldValue);
entry.OnBackButtonPress(entry, TheEvent);
ev.Handled = true;
}
};
entry.TextChanged += (sender, args) =>
{
OldValue = args.OldTextValue;
NewValue = args.NewTextValue;
};
}
}
protected virtual void OnBackButton(BackButtonEventArgs e)
{
BackButton?.Invoke(this, e);
}
private void OnOnBackButton(BackButtonEventArgs e)
{
OnBackButton?.Invoke(this, e);
}