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DemoFilteredItemSource.cs
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DemoFilteredItemSource.cs
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using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
namespace Maui.Controls.Sample.Pages.CollectionViewGalleries
{
internal class DemoFilteredItemSource
{
readonly List<CollectionViewGalleryTestItem> _source;
private readonly Func<string, CollectionViewGalleryTestItem, bool> _filter;
public ObservableCollection<CollectionViewGalleryTestItem> Items { get; }
public DemoFilteredItemSource(int count = 50, Func<string, CollectionViewGalleryTestItem, bool> filter = null)
{
_source = new List<CollectionViewGalleryTestItem>();
string[] images =
{
"cover1.jpg",
"oasis.jpg",
"photo.jpg",
"Vegetables.jpg",
"Fruits.jpg",
"FlowerBuds.jpg",
"Legumes.jpg"
};
for (int n = 0; n < count; n++)
{
_source.Add(new CollectionViewGalleryTestItem(DateTime.Now.AddDays(n),
$"{images[n % images.Length]}, {n}", images[n % images.Length], n));
}
Items = new ObservableCollection<CollectionViewGalleryTestItem>(_source);
_filter = filter ?? ItemMatches;
}
private bool ItemMatches(string filter, CollectionViewGalleryTestItem item)
{
filter = filter ?? "";
return item.Caption.Contains(filter, StringComparison.OrdinalIgnoreCase);
}
public void FilterItems(string filter)
{
var filteredItems = _source.Where(item => _filter(filter, item)).ToList();
foreach (CollectionViewGalleryTestItem collectionViewGalleryTestItem in _source)
{
if (!filteredItems.Contains(collectionViewGalleryTestItem))
{
Items.Remove(collectionViewGalleryTestItem);
}
else
{
if (!Items.Contains(collectionViewGalleryTestItem))
{
Items.Add(collectionViewGalleryTestItem);
}
}
}
}
}
}