A bit more stuff

Author: DerekGooding

SimpleDataGrid/Class1.cs

@@ -1,10 +1,18 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
+using SimpleDataGrid.Pagination;
+using System.Windows.Controls;
 
-namespace SimpleDataGrid.Pagination;
-internal class DataGridExtensions
+namespace SimpleDataGrid.Extensions;
+
+public static class DataGridExtensions
 {
+    public static void BindPagedSource<T>( this DataGrid grid, PagedCollectionView<T> pagedCollection)
+        => grid.ItemsSource = pagedCollection.GetCurrentPage();
+
+    public static void RefreshPagedSource<T>(
+        this DataGrid grid,
+        PagedCollectionView<T> pagedCollection)
+    {
+        grid.ItemsSource = null;
+        grid.ItemsSource = pagedCollection.GetCurrentPage();
+    }
 }

SimpleDataGrid/Extensions/DataGridExtensions.cs

@@ -1,10 +1,29 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace SimpleDataGrid.Pagination;
-internal class FilterCollection
+namespace SimpleDataGrid.Filtering;
+
+public class FilterCollection<T>(IEnumerable<T> items)
 {
+    private readonly ObservableCollection<T> _source = new(items);
+    private readonly List<Func<T, bool>> _filters = [];
+
+    public void AddFilter(Func<T, bool> filter) => _filters.Add(filter);
+
+    public void ClearFilters() => _filters.Clear();
+
+    public IEnumerable<T> ApplyFilters()
+    {
+        IEnumerable<T> query = _source;
+
+        foreach (var filter in _filters)
+        {
+            query = query.Where(filter);
+        }
+
+        return query;
+    }
+
+    public void Add(T item) => _source.Add(item);
+
+    public void Remove(T item) => _source.Remove(item);
+
+    public void Clear() => _source.Clear();
 }

SimpleDataGrid/Filtering/FilterCollection.cs

@@ -0,0 +1 @@
+global using System.Collections.ObjectModel;

SimpleDataGrid/GlobalUsings.cs

@@ -1,10 +1,52 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace SimpleDataGrid.Pagination;
-internal class PagedCollectionView
+namespace SimpleDataGrid.Pagination;
+
+public class PagedCollectionView<T>
 {
+    private readonly IEnumerable<T> _items;
+
+    public int PageSize { get; }
+    public int CurrentPage { get; private set; }
+    public int TotalItems => _items.Count();
+    public int TotalPages => (int)Math.Ceiling((double)TotalItems / PageSize);
+
+    public PagedCollectionView(IEnumerable<T> items, int pageSize = 10)
+    {
+        ArgumentOutOfRangeException.ThrowIfNegativeOrZero(pageSize);
+
+        _items = items ?? throw new ArgumentNullException(nameof(items));
+        PageSize = pageSize;
+        CurrentPage = 1;
+    }
+
+    public IEnumerable<T> GetCurrentPage() => _items
+            .Skip((CurrentPage - 1) * PageSize)
+            .Take(PageSize);
+
+    public bool MoveNextPage()
+    {
+        if (CurrentPage < TotalPages)
+        {
+            CurrentPage++;
+            return true;
+        }
+        return false;
+    }
+
+    public bool MovePreviousPage()
+    {
+        if (CurrentPage > 1)
+        {
+            CurrentPage--;
+            return true;
+        }
+        return false;
+    }
+
+    public void MoveToPage(int pageNumber)
+    {
+        if (pageNumber < 1 || pageNumber > TotalPages)
+            throw new ArgumentOutOfRangeException(nameof(pageNumber));
+
+        CurrentPage = pageNumber;
+    }
 }