如果我正确理解您的问题,您希望图像中的黑色方块透明吗?
更新:上传样本这里的项目:http://www.mediafire.com/?5tfkd1cxwfq0rct
我认为问题是,VisualBrush
内Panel
不会延长。您可以通过绑定的宽度和高度得到想要的效果无论Panel
您使用的Border
<Border Name="border" BorderBrush="Red" BorderThickness="1" CornerRadius="5">
<Border.OpacityMask>
<VisualBrush>
<VisualBrush.Visual>
<Grid Width="{Binding ElementName=border, Path=ActualWidth}"
Height="{Binding ElementName=border, Path=ActualHeight}">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="20"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="20"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="20"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Rectangle Fill="Transparent" Grid.Column="0"/>
<Rectangle Fill="Black" Grid.Column="1"/>
<Rectangle Fill="Transparent" Grid.Column="2"/>
<Rectangle Fill="Black" Grid.Row="1" Grid.ColumnSpan="3"/>
</Grid>
</VisualBrush.Visual>
</VisualBrush>
</Border.OpacityMask>
<Grid>
<TextBlock Text="Testing OpacityMask with a rather long string................." Grid.ZIndex="3"/>
<Rectangle Fill="Green"/>
</Grid>
</Border>
更新的ActualWidth的和的ActualHeight再次
的DropShadowEffect的装饰儿童Border
似乎推的OpacityMask都是Verticaly和Horizontaly。更糟糕的是它似乎堆叠起来,所以在你的例子中,当你有三个DropShadowEffects三个嵌套的Decorators
时,BlurRadius的总和是45(20 + 15 + 10),所以不透明度蒙版被推送45(至少它看起来像是在发生什么事情,但有点难以分辨......)。您可以尝试通过增加ColumnDefinition Widths和RowDefinition Heights来弥补这一点,但我认为很难找到动态解决方案。
对您的问题更好的方法可能是使用Border.Clip
,但这并不容易。
Point1: 0, 2
Point2: 12, 2
Point3: 12, 0
Point4: Width of Border - 12, 0
Point5: Width of Border - 12, 2
Point5: Width of Border, 2
Point6: Width of Border, Height of Border
Point7: 0, Height of Border
更新3
想出了一个更好的解决方案,不需要那么多的绑定。创建一个派生自Border
的自定义类并重写GetLayoutClip。这适用于Designer和Runtime。为了提高灵活性ClippedBorder
你能介绍一些依赖属性,而不是使用硬编码的2和12新样本这里应用:http://www.mediafire.com/?9i13rrqpbmzdbvs
public class ClippedBorder : Border
{
protected override Geometry GetLayoutClip(Size layoutSlotSize)
{
PathGeometry pathGeometry = new PathGeometry();
pathGeometry.Figures = new PathFigureCollection();
//Point1: 0, 2
PathFigure pathFigure = new PathFigure();
pathFigure.StartPoint = new Point(0, 2);
//Point2: 12, 2
LineSegment lineSegment1 = new LineSegment();
lineSegment1.Point = new Point(12, 2);
//Point3: 12, 0
LineSegment lineSegment2 = new LineSegment();
lineSegment2.Point = new Point(12, 0);
//Point4: Width of Border - 12, 0
LineSegment lineSegment3 = new LineSegment();
lineSegment3.Point = new Point(this.ActualWidth-12, 0);
//Point5: Width of Border - 12, 2
LineSegment lineSegment4 = new LineSegment();
lineSegment4.Point = new Point(this.ActualWidth-12, 2);
//Point5: Width of Border, 2
LineSegment lineSegment5 = new LineSegment();
lineSegment5.Point = new Point(this.ActualWidth, 2);
//Point6: Width of Border, Height of Border
LineSegment lineSegment6 = new LineSegment();
lineSegment6.Point = new Point(this.ActualWidth, this.ActualHeight);
//Point7: 0, Height of Border
LineSegment lineSegment7 = new LineSegment();
lineSegment7.Point = new Point(0, this.ActualHeight);
pathFigure.Segments.Add(lineSegment1);
pathFigure.Segments.Add(lineSegment2);
pathFigure.Segments.Add(lineSegment3);
pathFigure.Segments.Add(lineSegment4);
pathFigure.Segments.Add(lineSegment5);
pathFigure.Segments.Add(lineSegment6);
pathFigure.Segments.Add(lineSegment7);
pathGeometry.Figures.Add(pathFigure);
return pathGeometry;
}
}
是黑色方块都应该是透明的。我试过你的代码,它不起作用 - 它显示了一切。我试图增加行/列上的宽度/高度,它仍然显示内容。 – Paya 2011-02-13 02:48:21