maui-linux/Xamarin.Forms.Core/ItemsView.cs

103 строки
2.9 KiB
C#
Исходник Обычный вид История

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using System.Collections;
using System.ComponentModel;
using Xamarin.Forms.Internals;
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namespace Xamarin.Forms
{
public abstract class ItemsView<TVisual> : View, ITemplatedItemsView<TVisual> where TVisual : BindableObject
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{
/*
public static readonly BindableProperty InfiniteScrollingProperty =
BindableProperty.Create<ItemsView, bool> (lv => lv.InfiniteScrolling, false);
public bool InfiniteScrolling
{
get { return (bool) GetValue (InfiniteScrollingProperty); }
set { SetValue (InfiniteScrollingProperty, value); }
}*/
public static readonly BindableProperty ItemsSourceProperty = BindableProperty.Create("ItemsSource", typeof(IEnumerable), typeof(ItemsView<TVisual>), null, propertyChanged: OnItemsSourceChanged);
public static readonly BindableProperty ItemTemplateProperty = BindableProperty.Create("ItemTemplate", typeof(DataTemplate), typeof(ItemsView<TVisual>), null, validateValue: ValidateItemTemplate);
internal ItemsView()
{
TemplatedItems = new TemplatedItemsList<ItemsView<TVisual>, TVisual>(this, ItemsSourceProperty, ItemTemplateProperty);
}
public IEnumerable ItemsSource
{
get { return (IEnumerable)GetValue(ItemsSourceProperty); }
set { SetValue(ItemsSourceProperty, value); }
}
public DataTemplate ItemTemplate
{
get { return (DataTemplate)GetValue(ItemTemplateProperty); }
set { SetValue(ItemTemplateProperty, value); }
}
/*public void UpdateNonNotifyingList()
{
this.templatedItems.ForceUpdate();
}*/
IListProxy ITemplatedItemsView<TVisual>.ListProxy
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{
get { return TemplatedItems.ListProxy; }
}
ITemplatedItemsList<TVisual> ITemplatedItemsView<TVisual>.TemplatedItems { get { return TemplatedItems; } }
[EditorBrowsable(EditorBrowsableState.Never)]
public TemplatedItemsList<ItemsView<TVisual>, TVisual> TemplatedItems { get; }
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TVisual IItemsView<TVisual>.CreateDefault(object item)
{
return CreateDefault(item);
}
void IItemsView<TVisual>.SetupContent(TVisual content, int index)
{
SetupContent(content, index);
}
void IItemsView<TVisual>.UnhookContent(TVisual content)
{
UnhookContent(content);
}
protected abstract TVisual CreateDefault(object item);
protected virtual void SetupContent(TVisual content, int index)
{
}
protected virtual void UnhookContent(TVisual content)
{
}
static void OnItemsSourceChanged(BindableObject bindable, object oldValue, object newValue)
{
var element = newValue as Element;
if (element == null)
return;
element.Parent = (Element)bindable;
}
static bool ValidateItemTemplate(BindableObject bindable, object value)
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{
var listView = bindable as ListView;
if (listView == null)
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return true;
var isRetainStrategy = listView.CachingStrategy == ListViewCachingStrategy.RetainElement;
var isDataTemplateSelector = listView.ItemTemplate is DataTemplateSelector;
if (isRetainStrategy && isDataTemplateSelector)
return false;
return true;
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}
}
}