namespace Yw.WpfUI.Hydro
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{
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/// <summary>
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/// 抽象选择辅助类
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/// </summary>
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internal class LogicalSelectionHelper
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{
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/// <summary>
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///
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/// </summary>
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public LogicalSelectionHelper(HelixViewport3D viewport)
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{
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_viewport = viewport;
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}
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/// <summary>
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/// 选择改变事件
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/// </summary>
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public event Action<List<LogicalVisual3D>> SelectionChangedEvent;
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/// <summary>
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/// 状态改变事件
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/// </summary>
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public event Action<LogicalVisual3D, bool> StateChangedEvent;
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private readonly HelixViewport3D _viewport;//三维组件
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/// <summary>
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/// 选择集合
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/// </summary>
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public List<LogicalVisual3D> Selection
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{
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get { return _selection; }
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private set { _selection = value; }
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}
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private List<LogicalVisual3D> _selection = new();
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#region 内部实现
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//添加选择
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private void AddToSelection(LogicalVisual3D visual)
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{
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if (_selection.Contains(visual))
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{
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return;
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}
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_selection.Add(visual);
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this.StateChangedEvent?.Invoke(visual, true);
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}
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//从选择中移除
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private void RemoveFromSelection(LogicalVisual3D visual)
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{
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if (!_selection.Contains(visual))
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{
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return;
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}
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_selection.Remove(visual);
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this.StateChangedEvent?.Invoke(visual, false);
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}
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//清理选择
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private void ClearSelection()
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{
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if (_selection.Count < 1)
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{
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return;
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}
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_selection.ForEach(x => this.StateChangedEvent?.Invoke(x, false));
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_selection.Clear();
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}
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#endregion
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/// <summary>
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/// 处理单个选择
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/// </summary>
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public void HandleSingle(Point pt)
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{
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var logicalVisual = _viewport.FindNearestVisual(pt) as LogicalVisual3D;
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if (logicalVisual == null)
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{
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if (_selection.Count > 0)
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{
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ClearSelection();
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this.SelectionChangedEvent?.Invoke(null);
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}
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return;
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}
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if (_selection.Count == 1 && _selection[0] == logicalVisual)
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{
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return;
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}
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ClearSelection();
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AddToSelection(logicalVisual);
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this.SelectionChangedEvent?.Invoke(_selection);
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}
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/// <summary>
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/// 处理多个选择
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/// </summary>
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public void HandleMulti(Point pt)
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{
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var logicalVisual = _viewport.FindNearestVisual(pt) as LogicalVisual3D;
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if (logicalVisual == null)
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{
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return;
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}
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if (_selection.Contains(logicalVisual))
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{
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return;
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}
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AddToSelection(logicalVisual);
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this.SelectionChangedEvent?.Invoke(_selection);
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}
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/// <summary>
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/// 选择Visual
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/// 不触发选择改变事件
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/// </summary>
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public void SelectVisual(LogicalVisual3D visual)
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{
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ClearSelection();
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if (visual == null)
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{
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return;
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}
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AddToSelection(visual);
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}
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/// <summary>
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/// 选择Visuals
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/// </summary>
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public void SelectVisual(List<LogicalVisual3D> visuals)
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{
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ClearSelection();
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if (visuals == null || visuals.Count < 1)
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{
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return;
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}
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visuals.ForEach(AddToSelection);
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}
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}
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}
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