最近看了一些科技感UI设计，其中很多的按钮都不是常见的圆角边，而是斜角边。查了一下，wpf中好像没有现成的斜角border，网上也没搜到现成的，于是自己写了点时间做了一个，写的较简单，有一些bug（主要是没有去管一些极值情况），但也基本可用了。
下面与大家分享一下代码：
先上效果：
前台代码：
<Window.Resources>
<Style TargetType="{x:Type local:BeveledBorder}">
<Setter Property="Background" Value="#90000000" />
<Setter Property="BorderBrush" Value="Black"/>
<Setter Property="BorderThickness" Value="2"/>
<Setter Property="Margin" Value="2" />
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="#90FF0000"/>
</Trigger>
</Style.Triggers>
</Style>
</Window.Resources>
<UniformGrid Rows="1" VerticalAlignment="Center" MinHeight="50"> <local:BeveledBorder CornerRadius="10,0,10,0">
<TextBlock Text="123" HorizontalAlignment="Center" VerticalAlignment="Center"/>
</local:BeveledBorder> <local:BeveledBorder CornerRadius="10,10,10,10"/> <local:BeveledBorder CornerRadius="10,20,10,20"/> <local:BeveledBorder CornerRadius="0,15,0,15"/> <local:BeveledBorder Width="40" Height="40"
CornerRadius="10,10,10,10"/> </UniformGrid>
后台类：
/// <summary>
/// 斜角Border
/// </summary>
class BeveledBorder : Decorator
{
public Brush BorderBrush
{
get { return (Brush)GetValue(BorderBrushProperty); }
set { SetValue(BorderBrushProperty, value); }
} public static readonly DependencyProperty BorderBrushProperty =
Border.BorderBrushProperty.AddOwner(typeof(BeveledBorder), new PropertyMetadata(Brushes.Transparent, CommonPropertyChanged)); public Thickness BorderThickness
{
get { return (Thickness)GetValue(BorderThicknessProperty); }
set { SetValue(BorderThicknessProperty, value); }
} public static readonly DependencyProperty BorderThicknessProperty =
Border.BorderThicknessProperty.AddOwner(typeof(BeveledBorder), new PropertyMetadata(new Thickness(), CommonPropertyChanged)); public Brush Background
{
get { return (Brush)GetValue(BackgroundProperty); }
set { SetValue(BackgroundProperty, value); }
} public static readonly DependencyProperty BackgroundProperty =
Control.BackgroundProperty.AddOwner(typeof(BeveledBorder), new PropertyMetadata(Brushes.Transparent, CommonPropertyChanged)); public CornerRadius CornerRadius
{
get { return (CornerRadius)GetValue(CornerRadiusProperty); }
set { SetValue(CornerRadiusProperty, value); }
} public static readonly DependencyProperty CornerRadiusProperty =
Border.CornerRadiusProperty.AddOwner(typeof(BeveledBorder), new PropertyMetadata(new CornerRadius(), CommonPropertyChanged)); private static void CommonPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
(d as BeveledBorder)._isrendersizechanged = true;
(d as BeveledBorder).InvalidateVisual();
} protected override void OnRender(DrawingContext drawingContext)
{
base.OnRender(drawingContext); if (_isrendersizechanged)
{
_isrendersizechanged = false;
UpdateGeometry(RenderSize);
} Pen pTop = new Pen(BorderBrush, BorderThickness.Top);
drawingContext.DrawGeometry(Background, pTop, _currenGeometry);
} protected override void OnRenderSizeChanged(SizeChangedInfo sizeInfo)
{
base.OnRenderSizeChanged(sizeInfo);
_isrendersizechanged = true;
} private void UpdateGeometry(Size nsize)
{
if (_currenGeometry == null)
{
_currenGeometry = new PathGeometry();
_currenGeometry.Figures.Add(new PathFigure());
_currenGeometry.Figures[].IsClosed = true;
}
else
{
_currenGeometry.Figures[].Segments.Clear();
} if (CornerRadius == null)
{
_currenGeometry.Figures[0].StartPoint = new Point(0, 0);
_currenGeometry.Figures[0].Segments.Add(ToLineSegment(new Point(nsize.Width, 0)));
_currenGeometry.Figures[0].Segments.Add(ToLineSegment(new Point(nsize.Width, nsize.Height)));
_currenGeometry.Figures[0].Segments.Add(ToLineSegment(new Point(0, nsize.Height)));
}
else
{
_currenGeometry.Figures[].StartPoint = new Point(CornerRadius.TopLeft, ); if (CornerRadius.TopRight <= )
{
_currenGeometry.Figures[].Segments.Add(ToLineSegment(new Point(nsize.Width, )));
}
else
{
_currenGeometry.Figures[].Segments.Add(ToLineSegment(new Point(nsize.Width - CornerRadius.TopRight, )));
_currenGeometry.Figures[].Segments.Add(ToLineSegment(new Point(nsize.Width, CornerRadius.TopRight)));
} if (CornerRadius.BottomRight <= )
{
_currenGeometry.Figures[].Segments.Add(ToLineSegment(new Point(nsize.Width, nsize.Height)));
}
else
{
_currenGeometry.Figures[].Segments.Add(ToLineSegment(new Point(nsize.Width, nsize.Height - CornerRadius.BottomRight)));
_currenGeometry.Figures[].Segments.Add(ToLineSegment(new Point(nsize.Width - CornerRadius.BottomRight, nsize.Height)));
} if (CornerRadius.BottomLeft <= )
{
_currenGeometry.Figures[].Segments.Add(ToLineSegment(new Point(, nsize.Height)));
}
else
{
_currenGeometry.Figures[].Segments.Add(ToLineSegment(new Point(CornerRadius.BottomLeft, nsize.Height)));
_currenGeometry.Figures[].Segments.Add(ToLineSegment(new Point(, nsize.Height - CornerRadius.BottomLeft)));
} if (CornerRadius.TopLeft > )
{
_currenGeometry.Figures[].Segments.Add(ToLineSegment(new Point(, CornerRadius.TopLeft)));
}
}
} private LineSegment ToLineSegment(Point pt)
{
return new LineSegment(pt, true);
} private PathGeometry _currenGeometry = null;
private bool _isrendersizechanged = true;
}