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using System;
using System.ComponentModel;
using System.Linq;
using Android.App;
using Android.Views;
using Android.Widget;
using ADatePicker = Android.Widget.DatePicker;
using ATimePicker = Android.Widget.TimePicker;
using Object = Java.Lang.Object;
namespace Xamarin.Forms.Platform.Android
{
public class PickerRenderer : ViewRenderer<Picker, EditText>
{
AlertDialog _dialog;
bool _isDisposed;
public PickerRenderer()
{
AutoPackage = false;
}
protected override void Dispose(bool disposing)
{
if (disposing && !_isDisposed)
{
_isDisposed = 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)
{
var textField = new EditText(Context) { Focusable = false, Clickable = true, Tag = this };
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;
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);
((IElementController)Element).SetValueFromRenderer(VisualElement.IsFocusedPropertyKey, true);
var builder = new AlertDialog.Builder(Context);
builder.SetView(layout);
builder.SetTitle(model.Title ?? "");
builder.SetNegativeButton(global::Android.Resource.String.Cancel, (s, a) =>
{
((IElementController)Element).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(global::Android.Resource.String.Ok, (s, a) =>
{
((IElementController)Element).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];
((IElementController)Element).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()).Show();
}
void RowsCollectionChanged(object sender, EventArgs e)
{
UpdatePicker();
}
void UpdatePicker()
{
Control.Hint = Element.Title;
string oldText = Control.Text;
if (Element.SelectedIndex == -1 || Element.Items == null)
Control.Text = null;
else
Control.Text = Element.Items[Element.SelectedIndex];
if (oldText != Control.Text)
((IVisualElementController)Element).NativeSizeChanged();
}
class PickerListener : Object, IOnClickListener
{
public static readonly PickerListener Instance = new PickerListener();
public void OnClick(global::Android.Views.View v)
{
var renderer = v.Tag as PickerRenderer;
if (renderer == null)
return;
renderer.OnClick();
}
}
}
}
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