Ooui-tws-port/Ooui.Forms/Renderers/PickerRenderer.cs

89 lines
2.2 KiB
C#

using Ooui.Forms.Extensions;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using Xamarin.Forms;
using Xamarin.Forms.Internals;
namespace Ooui.Forms.Renderers
{
public class PickerRenderer : ViewRenderer<Picker, Select>
{
private bool _disposed;
private Select _select;
public PickerRenderer()
{
}
protected override void OnElementChanged(ElementChangedEventArgs<Picker> e)
{
if (e.NewElement != null)
{
if (Control == null)
{
_select = new Select();
_select.Change += _select_Change;
SetNativeControl(_select);
}
UpdateItems();
UpdateBackgroundColor();
}
base.OnElementChanged(e);
}
private void _select_Change(object sender, TargetEventArgs e)
{
Element.SetValueFromRenderer(Picker.SelectedIndexProperty, Element.ItemsSource.IndexOf(_select.Value));
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
if (e.PropertyName == Picker.ItemsSourceProperty.PropertyName)
{
UpdateItems();
}
}
protected override void Dispose(bool disposing)
{
base.Dispose(disposing);
if (disposing && !_disposed)
{
_select.Change -= _select_Change;
_disposed = true;
}
}
private void UpdateBackgroundColor()
{
var backgroundColor = Element.BackgroundColor.ToOouiColor();
_select.Style.BackgroundColor = backgroundColor;
}
private void UpdateItems()
{
var items = Element.ItemsSource;
if (items != null)
{
foreach (var item in items)
{
var s = item.ToString();
_select.AddOption(s, s);
}
}
}
}
}