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| 1 | +/* |
| 2 | + * Copyright (c) 2026 Erik Darling, Darling Data LLC |
| 3 | + * |
| 4 | + * This file is part of the SQL Server Performance Monitor. |
| 5 | + * |
| 6 | + * Licensed under the MIT License. See LICENSE file in the project root for full license information. |
| 7 | + */ |
| 8 | + |
| 9 | +using System; |
| 10 | +using System.Collections.Generic; |
| 11 | +using System.Linq; |
| 12 | +using System.Windows; |
| 13 | +using System.Windows.Controls; |
| 14 | +using System.Windows.Media; |
| 15 | +using PerformanceMonitorDashboard.Models; |
| 16 | + |
| 17 | +namespace PerformanceMonitorDashboard.Services; |
| 18 | + |
| 19 | +/// <summary> |
| 20 | +/// Non-generic interface for looking up filter state from a shared dictionary. |
| 21 | +/// </summary> |
| 22 | +public interface IDataGridFilterManager |
| 23 | +{ |
| 24 | + Dictionary<string, ColumnFilterState> Filters { get; } |
| 25 | + void SetFilter(ColumnFilterState filterState); |
| 26 | + void UpdateFilterButtonStyles(); |
| 27 | +} |
| 28 | + |
| 29 | +/// <summary> |
| 30 | +/// Manages column filter state, unfiltered data capture, and filter application |
| 31 | +/// for a single DataGrid. Eliminates per-grid boilerplate code. |
| 32 | +/// </summary> |
| 33 | +public class DataGridFilterManager<T> : IDataGridFilterManager |
| 34 | +{ |
| 35 | + private readonly DataGrid _dataGrid; |
| 36 | + private readonly Dictionary<string, ColumnFilterState> _filters = new(); |
| 37 | + private List<T>? _unfilteredData; |
| 38 | + |
| 39 | + public DataGridFilterManager(DataGrid dataGrid) |
| 40 | + { |
| 41 | + _dataGrid = dataGrid; |
| 42 | + } |
| 43 | + |
| 44 | + public Dictionary<string, ColumnFilterState> Filters => _filters; |
| 45 | + |
| 46 | + /// <summary> |
| 47 | + /// Called when new data arrives (refresh cycle). Captures unfiltered data, |
| 48 | + /// then re-applies any active filters. |
| 49 | + /// </summary> |
| 50 | + public void UpdateData(List<T> newData) |
| 51 | + { |
| 52 | + _unfilteredData = newData; |
| 53 | + |
| 54 | + if (!HasActiveFilters()) |
| 55 | + { |
| 56 | + _dataGrid.ItemsSource = newData; |
| 57 | + return; |
| 58 | + } |
| 59 | + |
| 60 | + ApplyFilters(); |
| 61 | + } |
| 62 | + |
| 63 | + /// <summary> |
| 64 | + /// Applies or removes a filter and re-filters the data. |
| 65 | + /// </summary> |
| 66 | + public void SetFilter(ColumnFilterState filterState) |
| 67 | + { |
| 68 | + if (filterState.IsActive) |
| 69 | + _filters[filterState.ColumnName] = filterState; |
| 70 | + else |
| 71 | + _filters.Remove(filterState.ColumnName); |
| 72 | + |
| 73 | + ApplyFilters(); |
| 74 | + UpdateFilterButtonStyles(); |
| 75 | + } |
| 76 | + |
| 77 | + private bool HasActiveFilters() |
| 78 | + { |
| 79 | + return _filters.Count > 0 && _filters.Values.Any(f => f.IsActive); |
| 80 | + } |
| 81 | + |
| 82 | + private void ApplyFilters() |
| 83 | + { |
| 84 | + if (_unfilteredData == null) return; |
| 85 | + |
| 86 | + if (!HasActiveFilters()) |
| 87 | + { |
| 88 | + _dataGrid.ItemsSource = _unfilteredData; |
| 89 | + return; |
| 90 | + } |
| 91 | + |
| 92 | + var filteredData = _unfilteredData.Where(item => |
| 93 | + { |
| 94 | + foreach (var filter in _filters.Values) |
| 95 | + { |
| 96 | + if (filter.IsActive && !DataGridFilterService.MatchesFilter(item!, filter)) |
| 97 | + return false; |
| 98 | + } |
| 99 | + return true; |
| 100 | + }).ToList(); |
| 101 | + |
| 102 | + _dataGrid.ItemsSource = filteredData; |
| 103 | + } |
| 104 | + |
| 105 | + /// <summary> |
| 106 | + /// Updates filter icon colors (gold when active, dim when inactive). |
| 107 | + /// </summary> |
| 108 | + public void UpdateFilterButtonStyles() |
| 109 | + { |
| 110 | + foreach (var column in _dataGrid.Columns) |
| 111 | + { |
| 112 | + if (column.Header is StackPanel headerPanel) |
| 113 | + { |
| 114 | + var filterButton = headerPanel.Children.OfType<Button>().FirstOrDefault(); |
| 115 | + if (filterButton != null && filterButton.Tag is string columnName) |
| 116 | + { |
| 117 | + bool hasActive = _filters.TryGetValue(columnName, out var filter) && filter.IsActive; |
| 118 | + |
| 119 | + var textBlock = new TextBlock |
| 120 | + { |
| 121 | + Text = hasActive ? "\uE16E" : "\uE71C", |
| 122 | + FontFamily = new FontFamily("Segoe MDL2 Assets"), |
| 123 | + Foreground = hasActive |
| 124 | + ? new SolidColorBrush(Color.FromRgb(0xFF, 0xD7, 0x00)) |
| 125 | + : (Brush)Application.Current.FindResource("ForegroundDimBrush") |
| 126 | + }; |
| 127 | + filterButton.Content = textBlock; |
| 128 | + |
| 129 | + filterButton.ToolTip = hasActive && filter != null |
| 130 | + ? $"Filter: {filter.DisplayText}\n(Click to modify)" |
| 131 | + : "Click to filter"; |
| 132 | + } |
| 133 | + } |
| 134 | + } |
| 135 | + } |
| 136 | +} |
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