gramps
a74162e34e
- Bottom-bar resolution dropdown (1080p60/1080p30/720p60/480p30) with tooltip on finding upload bandwidth; disabled while live; no in-app speed test - FocusPreservingListBox keeps selection/focus coherent when a selected scene/source is deleted (skip hidden scenes; leave list when empty) - Themes/Controls.xaml: single dark-theme dictionary merged once in App.xaml; custom ComboBox template fixes SelectionBoxItem rendering; GoLiveWindow and ReuseImageDialog consolidated onto shared styles - AppLog file logger + AppDomain/Dispatcher exception hooks; checkpointed MainWindow/VM/dialog constructors (caught MenuItemRole.Separator XAML crash) - Memory map: schema.md conventions, per-directory index.md, updated ai.md/ TASKS.md/README.md (OAuth creds real; token persistence still pending)
73 lines
2.3 KiB
C#
73 lines
2.3 KiB
C#
using System.Collections.Specialized;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Input;
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using System.Windows.Threading;
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namespace ytLive.Helpers;
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/// <summary>
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/// A ListBox that keeps selection and keyboard focus coherent when the
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/// selected item is deleted. Focus lands on the item now at the deleted
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/// position (the previous item when the last one was removed) or leaves
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/// the box entirely when it becomes empty. Drag-to-reorder is untouched.
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/// </summary>
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public class FocusPreservingListBox : ListBox
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{
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/// <summary>
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/// Predicate deciding which items the delete-focus fallback may land on
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/// (e.g. skip hidden scenes). Null means every item is eligible.
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/// </summary>
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public Func<object, bool>? IsSelectable { get; set; }
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protected override void OnItemsChanged(NotifyCollectionChangedEventArgs e)
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{
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base.OnItemsChanged(e);
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if (e.Action != NotifyCollectionChangedAction.Remove) return;
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var hadFocus = IsKeyboardFocusWithin || IsKeyboardFocused;
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if (!hadFocus) return;
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if (Mouse.Captured == this) return;
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if (Items.Count == 0)
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{
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SelectedItem = null;
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MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));
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return;
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}
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var targetIndex = FindSelectableIndex(Math.Clamp(e.OldStartingIndex, 0, Items.Count - 1));
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if (targetIndex < 0)
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{
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SelectedItem = null;
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return;
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}
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SelectedIndex = targetIndex;
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var item = Items[targetIndex];
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Dispatcher.BeginInvoke(DispatcherPriority.Loaded, () =>
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{
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ScrollIntoView(item);
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if (ItemContainerGenerator.ContainerFromItem(item) is ListBoxItem container)
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container.Focus();
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});
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}
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private int FindSelectableIndex(int start)
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{
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for (var i = start; i >= 0; i--)
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if (IsItemSelectable(i)) return i;
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for (var i = start + 1; i < Items.Count; i++)
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if (IsItemSelectable(i)) return i;
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return -1;
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}
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private bool IsItemSelectable(int index)
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{
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if (index < 0 || index >= Items.Count) return false;
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var item = Items[index];
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return item != null && (IsSelectable?.Invoke(item) ?? true);
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}
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}
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