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| 1 | +using System; |
| 2 | +using System.Collections.Generic; |
| 3 | +using System.Linq; |
| 4 | +using System.Windows; |
| 5 | +using System.Windows.Controls; |
| 6 | +using System.Windows.Input; |
| 7 | +using System.Windows.Interactivity; |
| 8 | +using GongSolutions.Wpf.DragDrop.Utilities; |
| 9 | + |
| 10 | +namespace Rubberduck.UI.Inspections |
| 11 | +{ |
| 12 | + public class InspectionContextMenuBehavior : Behavior<DataGrid> |
| 13 | + { |
| 14 | + protected override void OnAttached() |
| 15 | + { |
| 16 | + base.OnAttached(); |
| 17 | + |
| 18 | + var element = AssociatedObject; |
| 19 | + if (element == null) |
| 20 | + { |
| 21 | + return; |
| 22 | + } |
| 23 | + |
| 24 | + AddHandler(element); |
| 25 | + } |
| 26 | + |
| 27 | + private void AddHandler(FrameworkElement element) |
| 28 | + { |
| 29 | + element.PreviewMouseRightButtonDown += OnClickStarting; |
| 30 | + element.MouseMove += OnMouseMoved; |
| 31 | + element.ContextMenuOpening += OnContextMenuOpened; |
| 32 | + element.ContextMenuClosing += OnContextMenuClosed; |
| 33 | + } |
| 34 | + |
| 35 | + private void RemoveHandler(FrameworkElement element) |
| 36 | + { |
| 37 | + element.PreviewMouseRightButtonDown -= OnClickStarting; |
| 38 | + element.MouseMove -= OnMouseMoved; |
| 39 | + element.ContextMenuOpening -= OnContextMenuOpened; |
| 40 | + element.ContextMenuClosing -= OnContextMenuClosed; |
| 41 | + } |
| 42 | + |
| 43 | + private void OnClickStarting(object sender, MouseButtonEventArgs e) |
| 44 | + { |
| 45 | + var element = AssociatedObject; |
| 46 | + var listItem = element?.GetVisualAncestor<ListViewItem>(); |
| 47 | + |
| 48 | + if (listItem == null) |
| 49 | + { |
| 50 | + e.Handled = true; |
| 51 | + return; |
| 52 | + } |
| 53 | + |
| 54 | + listItem.IsSelected = true; |
| 55 | + } |
| 56 | + |
| 57 | + private void OnMouseMoved(object sender, MouseEventArgs e) |
| 58 | + { |
| 59 | + if (!(sender is DataGrid grid) || _contextMenuOpen || grid.ContextMenu is null) |
| 60 | + { |
| 61 | + return; |
| 62 | + } |
| 63 | + |
| 64 | + grid.ContextMenu.Visibility = GetDataGridRows(grid).Any(row => row.IsMouseOver) ? Visibility.Visible : Visibility.Collapsed; |
| 65 | + } |
| 66 | + |
| 67 | + private static IEnumerable<DataGridRow> GetDataGridRows(ItemsControl grid) |
| 68 | + { |
| 69 | + var source = grid.ItemsSource; |
| 70 | + if (source is null) |
| 71 | + { |
| 72 | + yield break; |
| 73 | + } |
| 74 | + |
| 75 | + foreach (var item in source) |
| 76 | + { |
| 77 | + if (grid.ItemContainerGenerator.ContainerFromItem(item) is DataGridRow row) |
| 78 | + { |
| 79 | + yield return row; |
| 80 | + } |
| 81 | + } |
| 82 | + } |
| 83 | + |
| 84 | + private bool _contextMenuOpen; |
| 85 | + |
| 86 | + private void OnContextMenuOpened(object sender, EventArgs e) |
| 87 | + { |
| 88 | + _contextMenuOpen = true; |
| 89 | + } |
| 90 | + |
| 91 | + private void OnContextMenuClosed(object sender, EventArgs e) |
| 92 | + { |
| 93 | + _contextMenuOpen = false; |
| 94 | + } |
| 95 | + |
| 96 | + protected override void OnDetaching() |
| 97 | + { |
| 98 | + var listView = AssociatedObject; |
| 99 | + if (listView != null) |
| 100 | + { |
| 101 | + RemoveHandler(listView); |
| 102 | + } |
| 103 | + |
| 104 | + base.OnDetaching(); |
| 105 | + } |
| 106 | + } |
| 107 | +} |
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