void OnClick()
{
Picker model = Element;
var picker = new NumberPicker(Context);
if (model.Items != null && model.Items.Any())
{
picker.MaxValue = model.Items.Count - 1;
picker.MinValue = 0;
picker.SetDisplayedValues(model.Items.ToArray());
picker.WrapSelectorWheel = false;
picker.DescendantFocusability = DescendantFocusability.BlockDescendants;
picker.Value = model.SelectedIndex;
}
var layout = new LinearLayout(Context)
{
Orientation = Orientation.Vertical
};
layout.AddView(picker);
ElementController.SetValueFromRenderer(VisualElement.IsFocusedPropertyKey, true);
var builder = new AlertDialog.Builder(Context);
builder.SetView(layout);
builder.SetTitle(model.Title ?? "");
builder.SetNegativeButton(Platform.Resource_String_Cancel(), (s, a) =>
{
ElementController.SetValueFromRenderer(VisualElement.IsFocusedPropertyKey, false);
// It is possible for the Content of the Page to be changed when Focus is changed.
// In this case, we'll lose our Control.
Control?.ClearFocus();
_dialog = null;
});
builder.SetPositiveButton(Platform.Resource_String_OK(), (s, a) =>
{
ElementController.SetValueFromRenderer(Picker.SelectedIndexProperty, picker.Value);
// It is possible for the Content of the Page to be changed on SelectedIndexChanged.
// In this case, the Element & Control will no longer exist.
if (Element != null)
{
if (model.Items.Count > 0 && Element.SelectedIndex >= 0)
{
Control.Text = model.Items[Element.SelectedIndex];
}
ElementController.SetValueFromRenderer(VisualElement.IsFocusedPropertyKey, false);
// It is also possible for the Content of the Page to be changed when Focus is changed.
// In this case, we'll lose our Control.
Control?.ClearFocus();
}
_dialog = null;
});
_dialog = builder.Create();
_dialog.DismissEvent += (sender, args) =>
{
ElementController.SetValueFromRenderer(VisualElement.IsFocusedPropertyKey, false);
};
_dialog.Show();
}
