wehub-resource-sync
134 lines
3.5 KiB
C#
134 lines
3.5 KiB
C#
#nullable enable
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using T3.Core.Operator;
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namespace T3.Editor.UiModel.ProjectHandling;
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/// <summary>
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/// Manage the navigation between previously selected instances.
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/// This can also be used sort items by relevancy in search dialog.
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/// </summary>
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internal sealed class NavigationHistory
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{
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public NavigationHistory(Structure structure)
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{
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_structure = structure;
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}
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/// <summary>
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/// abC select D -> append...
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/// abcD select C -> keep order if new selection is next to current index
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/// abCd select A -> resort
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/// bcdA
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///
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/// </summary>
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public void UpdateSelectedInstance(Instance instance)
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{
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var path = instance.InstancePath;
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var hash = GetHashForIdPath(path);
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if (!_idPathsByHash.TryGetValue(hash, out var previousPath))
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{
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_idPathsByHash[hash] = path;
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_previousSelections.Insert(0, path);
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_currentIndex = 0;
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return;
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}
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var index = _previousSelections.IndexOf(previousPath);
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if (index == -1)
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{
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Log.Warning("Inconsistent navigation path");
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return;
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}
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if (index == 0)
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{
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_currentIndex = 0;
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return;
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}
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// Keep order
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if (Math.Abs(index - _currentIndex) <= 1)
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{
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_currentIndex = index;
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return;
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}
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// Rearrange
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_previousSelections.RemoveAt(index);
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_previousSelections.Insert(0, previousPath);
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_currentIndex = 0;
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}
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public Instance? GetLastSelectedInstance()
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{
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if (_previousSelections.Count == 0)
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return null;
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return _previousSelections.Count < _currentIndex
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? null
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: _structure.GetInstanceFromIdPath(_previousSelections[_currentIndex]);
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}
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public IEnumerable<Instance> GetPreviouslySelectedInstances()
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{
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foreach (var path in _previousSelections)
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{
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var instance = _structure.GetInstanceFromIdPath(path);
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if (instance == null)
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continue;
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yield return instance;
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}
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}
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internal IReadOnlyList<Guid>? NavigateBackwards()
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{
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while (_currentIndex < _previousSelections.Count - 1)
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{
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_currentIndex++;
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var path = _previousSelections[_currentIndex];
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if (_structure.GetInstanceFromIdPath(path) == null)
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continue;
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return path;
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}
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return null;
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}
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internal IReadOnlyList<Guid>? NavigateForward()
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{
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while (_currentIndex > 0)
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{
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_currentIndex--;
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var path = _previousSelections[_currentIndex];
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if (_structure.GetInstanceFromIdPath(path) == null)
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continue;
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return path;
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}
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return null;
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}
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private long GetHashForIdPath(IReadOnlyList<Guid> path)
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{
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long hash = 31.GetHashCode();
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foreach (var id in path)
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{
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hash = hash * 31 + id.GetHashCode();
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}
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return hash;
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}
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private int _currentIndex;
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private Structure _structure;
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private readonly List<IReadOnlyList<Guid>> _previousSelections = new();
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private readonly Dictionary<long, IReadOnlyList<Guid>> _idPathsByHash = new();
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} |