46 lines
1.3 KiB
C#
46 lines
1.3 KiB
C#
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using System;
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using System.Windows;
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using System.Windows.Ink;
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using System.Windows.Media;
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namespace InkCanvasForClassX.Libraries
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{
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/// <summary>
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/// 該控件提供一個基於<c>DrawingVisual</c>的最小的<c>StrokeCollection</c>渲染控件，用以替代重量級的<c>InkCanvas</c>控件
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/// </summary>
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public class InkProjector : FrameworkElement {
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private VisualCollection _children;
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private DrawingVisual _layer = new DrawingVisual();
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private StrokeCollection _strokes;
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public InkProjector()
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{
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_children = new VisualCollection(this) {
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_layer // 初始化DrawingVisual
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};
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}
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public StrokeCollection Strokes {
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get => _strokes;
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set {
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_strokes = value;
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DrawInk();
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}
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}
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protected override int VisualChildrenCount => _children.Count;
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protected override Visual GetVisualChild(int index) {
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if (index < 0 || index >= _children.Count) throw new ArgumentOutOfRangeException();
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return _children[index];
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}
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private void DrawInk() {
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DrawingContext context = _layer.RenderOpen();
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_strokes.Draw(context);
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context.Close();
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}
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}
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}
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