WPF 装饰器造的Rectangle绑不上事件

2017-09-28 07:37:58 805 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

WPF绘图基础：掌握Rectangle与Ellipse的Stretch属性控制在WPF界面开发中，矢量图形绘制是构建现代化UI的基础能力。其核心原理在于通过Shape类及其派生元素，结合布局系统实现图形的自适应渲染。这一机制的技术价值在于能够创建分辨率无关、可动态缩放的界面元素，从而提升应用在不同设备和屏幕尺寸下的视觉一致性。在实际应用场景中，开发者常需处理图形与容器尺寸的匹配问题，这正是Stretch属性的关键作用所在。通过设置None、Fill、Uniform和UniformToFill四种模式，可以精确控制矩形和椭圆的填充行为，例如使用Uniform模式可确保椭圆在任何容器中保阅读详情

Rectangle _bodyRect;
private Path _border;
private VisualCollection _visuals;
private FrameworkElement _adornedElement;

public FocusAdorner(UIElement adornedElement) : base(adornedElement)
{
_adornedElement = this.AdornedElement as FrameworkElement;
_visuals = new VisualCollection(this);
CreateGrip();
AddEvents();
}

protected override Size ArrangeOverride(Size finalSize)
{
_bodyRect.Arrange(new Rect(2, 2, finalSize.Width - 4, finalSize.Width - 4));
RectangleGeometry rect = new RectangleGeometry(new Rect(0, 0, _adornedElement.ActualWidth + 2, _adornedElement.ActualHeight + 2));
_border.Data = rect;
_border.Arrange(new Rect(-1, -1, finalSize.Width + 2, finalSize.Height + 2));

return base.ArrangeOverride(finalSize);
}

private void CreateGrip()
{
_bodyRect = InitBodyRect();
if (_adornedElement is AddButton)
{
if ((_adornedElement as AddButton).IsEditing)
{
_bodyRect.IsHitTestVisible = false;
}

}
_bodyRect.Cursor = Cursors.Hand;

_border = new Path();
_border.StrokeThickness = 2;
_border.Stroke = new SolidColorBrush(Colors.Red);

_visuals.Add(_bodyRect);
_visuals.Add(_border);
}

private void AddEvents()
{
_bodyRect.PreviewMouseDown += BodyRectOnPreviewMouseDown;
}

private void BodyRectOnPreviewMouseDown(object sender, MouseButtonEventArgs mouseButtonEventArgs)
{
MessageBox.Show("aaaa");
}

private Rectangle InitBodyRect()
{
Rectangle rect = new Rectangle();
rect.Stroke = Brushes.Transparent;

SolidColorBrush b = new SolidColorBrush(Colors.Transparent);
rect.Fill = b;

return rect;
}

protected override void OnRender(DrawingContext drawingContext)
{
base.OnRender(drawingContext);
}

protected override Visual GetVisualChild(int index)
{
return _visuals[index];
}

protected override int VisualChildrenCount
{
get
{
return _visuals.Count;
}
}

这是我的代码，然后我想给_bodyRect绑定事件，不知道为什么总是绑定不上去，有没有大神指导一下，谢谢~

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