namespace Yw.WpfUI.Hydro
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{
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/// <summary>
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/// 绘制选择辅助类
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/// </summary>
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internal class DrawSelectionHelper : IDisposable
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{
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/// <summary>
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///
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/// </summary>
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public DrawSelectionHelper
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(
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HelixViewport3D viewport,
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DrawInitialHelper initialHelper
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)
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{
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_viewport = viewport;
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_initialHelper = initialHelper;
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Attach();
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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<VisualDraw3D>> SelectionChangedEvent;
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|
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private readonly HelixViewport3D _viewport = null;//三维组件
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private readonly DrawInitialHelper _initialHelper = null;//初始化辅助类
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private VisualStateObject _stateObject = null;//状态对象
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private List<VisualDraw3D> _selection = new();//选择集合
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/// <summary>
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/// 选择集合
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/// </summary>
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public List<VisualDraw3D> 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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/// <summary>
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/// 是否启用
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/// </summary>
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public bool Enabled
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{
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get { return _enabled; }
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set { _enabled = value; }
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}
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private bool _enabled = true;
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/// <summary>
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/// 是否初始化
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/// </summary>
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public bool Initialized
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{
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get { return _initialized; }
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private set { _initialized = value; }
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}
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private bool _initialized = false;
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//初始化
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private void Initialize()
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{
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if (!_initialHelper.Initialized)
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{
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return;
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}
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if (_stateObject == null)
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{
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_stateObject = new VisualStateObject();
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_stateObject.HtmlColor = Yw.Settings.HydroL3dParasHelper.HydroL3d.Selection.HtmlColor;
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_stateObject.Opacity = Yw.Settings.HydroL3dParasHelper.HydroL3d.Selection.Opacity;
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_stateObject.Scale = Yw.Settings.HydroL3dParasHelper.HydroL3d.Selection.Scale;
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_stateObject.Visible = Yw.Settings.HydroL3dParasHelper.HydroL3d.Selection.Visible;
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}
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_initialized = true;
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}
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//处理初始化完成
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private void OnInitialCompleted()
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{
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Initialize();
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}
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//处理鼠标弹起
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private void OnMouseUp(object sender, MouseButtonEventArgs e)
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{
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if (e.ChangedButton == MouseButton.Left)
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{
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var pt = e.GetPosition(_viewport);
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Handle(pt);
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}
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}
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#region 内部实现
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//添加选择
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private void AddToSelection(VisualDraw3D visual3d)
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{
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if (_selection.Contains(visual3d))
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{
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return;
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}
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_selection.Add(visual3d);
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visual3d.LoadState(eVisualState.Selection, _stateObject);
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visual3d.UpdateVisual3D();
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}
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//从选择中移除
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private void RemoveFromSelection(VisualDraw3D visual3d)
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{
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if (!_selection.Contains(visual3d))
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{
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return;
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}
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_selection.Remove(visual3d);
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visual3d.UnloadState(eVisualState.Selection);
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visual3d.UpdateVisual3D();
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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 =>
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{
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x.UnloadState(eVisualState.Selection);
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x.UpdateVisual3D();
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});
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_selection.Clear();
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}
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#endregion
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#region 选择处理
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//处理
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private void Handle(Point pt)
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{
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if (!Initialized)
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{
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return;
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}
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if (!Enabled)
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{
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return;
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}
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var visual3d = _viewport.FindNearestVisual(pt) as VisualDraw3D;
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if (visual3d == 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] == visual3d)
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{
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return;
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}
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ClearSelection();
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AddToSelection(visual3d);
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this.SelectionChangedEvent?.Invoke(_selection);
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}
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//附加
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private void Append(Point pt)
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{
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if (!Initialized)
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{
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return;
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}
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if (!Enabled)
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{
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return;
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}
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var visual3d = _viewport.FindNearestVisual(pt) as VisualDraw3D;
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if (visual3d == null)
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{
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return;
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}
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if (_selection.Contains(visual3d))
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{
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return;
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}
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AddToSelection(visual3d);
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this.SelectionChangedEvent?.Invoke(_selection);
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}
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#endregion
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#region 外部选择
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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(VisualDraw3D 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<VisualDraw3D> 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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#endregion
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//附加
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private void Attach()
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{
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_viewport.MouseUp += OnMouseUp;
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_initialHelper.InitialCompletedEvent += OnInitialCompleted;
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}
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//分离
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private void Detach()
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{
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_viewport.MouseUp -= OnMouseUp;
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_initialHelper.InitialCompletedEvent -= OnInitialCompleted;
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}
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/// <summary>
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/// 释放
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/// </summary>
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public void Dispose()
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{
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Detach();
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}
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}
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}
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