我想在WPF / Silverlight中创建一个控件。该控件是矩形/边框,从中心是空心的。我的意图是除了矩形/边框容器内的平方区域之外的所有其他内容。有可能这样做吗?
此外,它应该能够在鼠标移动时移动此空心区域。
提前感谢大家的帮助。
答案 0 :(得分:3)
嗯,最简单的解决方案是:
<Grid Width="256" Height="256" MouseMove="UIElement_OnMouseMove">
<Image Source="test1.jpg" Stretch="UniformToFill" />
<Path Fill="#81808080" Stretch="Fill">
<Path.Data>
<CombinedGeometry GeometryCombineMode="Exclude">
<CombinedGeometry.Geometry1>
<RectangleGeometry Rect="0,0,100,100" />
</CombinedGeometry.Geometry1>
<CombinedGeometry.Geometry2>
<RectangleGeometry
x:Name="Hole"
RadiusX="7"
RadiusY="7"
Rect="20,20,60,60" /> <!-- this is the hole -->
</CombinedGeometry.Geometry2>
</CombinedGeometry>
</Path.Data>
</Path>
</Grid>
事件处理程序:
private void UIElement_OnMouseMove(object sender, MouseEventArgs e) {
var element = (FrameworkElement) sender;
var position = e.GetPosition(element);
var relativeX = position.X/element.ActualWidth*100.0;
var relativeY = position.Y/element.ActualHeight*100.0;
Hole.Rect = new Rect(relativeX - 20, relativeY - 20, 40, 40);
}