namespace Yw.WpfUI.Hydro
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{
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/// <summary>
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/// 抽象公告文本辅助类
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/// </summary>
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internal class LogicalBillboardTextHelper
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{
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/// <summary>
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///
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/// </summary>
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public LogicalBillboardTextHelper(HelixViewport3D viewport)
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{
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_viewport = viewport;
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}
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private readonly HelixViewport3D _viewport = null;//三维组件
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private readonly double _fontSize = 12;//字体大小
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private readonly Brush _foregroud = Brushes.Black;//前景色
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private readonly Brush _background = Brushes.Transparent;//背景色
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private readonly Brush _borderbrush = Brushes.Transparent;//边框色
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private readonly Dictionary<string, BillboardTextVisual3D> _cache = new();//缓存
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/// <summary>
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/// 设置
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/// </summary>
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public void Set(List<TextL3d> items)
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{
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Clear();
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items?.ForEach(x => AddTextVisual3D(x));
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}
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/// <summary>
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/// 清理
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/// </summary>
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public void Clear()
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{
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if (_cache.Count > 0)
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{
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foreach (var item in _cache)
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{
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_viewport.Children.Remove(item.Value);
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}
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_cache.Clear();
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}
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}
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/// <summary>
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/// 更新
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/// </summary>
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public void Update(TextL3d item)
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{
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if (item == null)
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{
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return;
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}
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if (_cache.ContainsKey(item.Id))
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{
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var billboardText = _cache[item.Id];
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if (billboardText != null)
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{
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billboardText.Text = item.Text;
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}
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}
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else
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{
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AddTextVisual3D(item);
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}
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}
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/// <summary>
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/// 更新
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/// </summary>
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public void Update(List<TextL3d> items)
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{
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items?.ForEach(x => Update(x));
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}
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//添加公告牌文本
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private void AddTextVisual3D(TextL3d item)
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{
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if (!_cache.ContainsKey(item.Id))
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{
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var billboardText = CreateTextVisual3D(item);
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if (billboardText != null)
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{
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_cache.Add(item.Id, billboardText);
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_viewport.Children.Add(billboardText);
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}
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}
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}
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//创建公告牌文本
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private BillboardTextVisual3D CreateTextVisual3D(TextL3d item)
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{
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if (item == null)
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{
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return default;
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}
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var logicalVisual = _viewport.Children.OfType<LogicalVisual3D>()
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.Where(x => x.Vmo.Id == item.Id).FirstOrDefault();
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if (logicalVisual == null)
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{
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return default;
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}
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var bounds = Visual3DHelper.FindBounds(logicalVisual, Transform3D.Identity);
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var position = bounds.GetCenter();
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var billboardText = new BillboardTextVisual3D();
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billboardText.Text = item.Text;
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billboardText.Foreground = _foregroud;
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billboardText.Background = _background;
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billboardText.BorderBrush = _borderbrush;
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billboardText.FontSize = _fontSize;
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billboardText.Padding = new Thickness(2);
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billboardText.Position = position;
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billboardText.HorizontalAlignment = HorizontalAlignment.Left;
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billboardText.VerticalAlignment = VerticalAlignment.Bottom;
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return billboardText;
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}
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}
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}
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