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using System;
using System.ComponentModel;
using System.Linq;
using Android.App;
using Android.Text;
using Android.Widget;
using Object = Java.Lang.Object;
namespace Xamarin.Forms.Platform.Android.AppCompat
{
public class PickerRenderer : ViewRenderer<Picker, EditText>
{
AlertDialog _dialog;
bool _disposed;
public PickerRenderer()
{
AutoPackage = false;
}
protected override EditText CreateNativeControl()
{
return new EditText(Context);
}
protected override void Dispose(bool disposing)
{
if (disposing && !_disposed)
{
_disposed = true;
((ObservableList<string>)Element.Items).CollectionChanged -= RowsCollectionChanged;
}
base.Dispose(disposing);
}
protected override void OnElementChanged(ElementChangedEventArgs<Picker> e)
{
if (e.OldElement != null)
((ObservableList<string>)e.OldElement.Items).CollectionChanged -= RowsCollectionChanged;
if (e.NewElement != null)
{
((ObservableList<string>)e.NewElement.Items).CollectionChanged += RowsCollectionChanged;
if (Control == null)
{
EditText textField = CreateNativeControl();
textField.Focusable = false;
textField.Clickable = true;
textField.Tag = this;
textField.InputType = InputTypes.Null;
textField.SetOnClickListener(PickerListener.Instance);
SetNativeControl(textField);
}
UpdatePicker();
}
base.OnElementChanged(e);
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
if (e.PropertyName == Picker.TitleProperty.PropertyName)
UpdatePicker();
if (e.PropertyName == Picker.SelectedIndexProperty.PropertyName)
UpdatePicker();
}
internal override void OnFocusChangeRequested(object sender, VisualElement.FocusRequestArgs e)
{
base.OnFocusChangeRequested(sender, e);
if (e.Focus)
OnClick();
else if (_dialog != null)
{
_dialog.Hide();
((IElementController)Element).SetValueFromRenderer(VisualElement.IsFocusedPropertyKey, false);
Control.ClearFocus();
_dialog = null;
}
}
void OnClick()
{
Picker model = Element;
using (var builder = new AlertDialog.Builder(Context))
{
builder.SetTitle(model.Title ?? "");
string[] items = model.Items.ToArray();
builder.SetItems(items, (s, e) => ((IElementController)model).SetValueFromRenderer(Picker.SelectedIndexProperty, e.Which));
builder.SetNegativeButton(global::Android.Resource.String.Cancel, (o, args) => { });
_dialog = builder.Create();
}
_dialog.SetCanceledOnTouchOutside(true);
_dialog.DismissEvent += (sender, args) =>
{
_dialog.Dispose();
_dialog = null;
};
_dialog.Show();
}
void RowsCollectionChanged(object sender, EventArgs e)
{
UpdatePicker();
}
void UpdatePicker()
{
Control.Hint = Element.Title;
if (Element.SelectedIndex == -1 || Element.Items == null)
Control.Text = null;
else
Control.Text = Element.Items[Element.SelectedIndex];
}
class PickerListener : Object, IOnClickListener
{
#region Statics
public static readonly PickerListener Instance = new PickerListener();
#endregion
public void OnClick(global::Android.Views.View v)
{
var renderer = v.Tag as PickerRenderer;
renderer?.OnClick();
}
}
}
}
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