如何在WPF中覆盖父控件的不透明度? [英] How do you override the opacity of a parent control in WPF?
问题描述
在WPF中的Grid
上设置不透明度时,所有子元素似乎都继承了其Opacity
.您如何让子元素不继承父元素的不透明性?
When you set the opacity on a Grid
in WPF, all the child elements appear to inherit its Opacity
. How can you have a child element not inherit the parent's opacity?
例如,下面的父网格在中间有一个子网格,背景设置为红色,但是由于父级的不透明性,背景显示为粉红色.我希望子网格具有纯色,不透明的背景:
For example, the following parent grid has one child grid in the middle with a background set to red, but the background appears pinkish because of the parent's opacity. I'd like the child grid to have a solid color, non-transparent background:
<Grid x:Name="LayoutRoot">
<Grid Background="Black" Opacity="0.5">
<Grid.RowDefinitions>
<RowDefinition Height="0.333*"/>
<RowDefinition Height="0.333*"/>
<RowDefinition Height="0.333*"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="0.333*"/>
<ColumnDefinition Width="0.333*"/>
<ColumnDefinition Width="0.333*"/>
</Grid.ColumnDefinitions>
<-- how do you make this child grid's background solid red
and not inherit the Opacity/Transparency of the parent grid? -->
<Grid Grid.Column="1" Grid.Row="1" Background="Red"/>
</Grid>
</Grid>
推荐答案
我能够使用画笔在纯xaml中绘制主网格背景,从而实现类似目的. 这样,只有父网格将设置其不透明度,并且其子元素将不会继承它.
I was able to achieve something like this in pure xaml using a Brush to paint the main grids background. This way only parent grid will have its opacity set and its child elements won't inherit it.
<Grid x:Name="LayoutRoot">
<Grid>
<Grid.Background>
<SolidColorBrush Color="Black" Opacity="0.5"/>
</Grid.Background>
<Grid.RowDefinitions>
<RowDefinition Height="0.333*"/>
<RowDefinition Height="0.333*"/>
<RowDefinition Height="0.333*"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="0.333*"/>
<ColumnDefinition Width="0.333*"/>
<ColumnDefinition Width="0.333*"/>
</Grid.ColumnDefinitions>
<Grid Grid.Column="1" Grid.Row="1" Background="Red" />
</Grid>
</Grid>
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