这个属性我们平时可能并不怎么用，先来看下MSDN上的解释:
解释的非常专业,然而我并没有看懂。
说说我的理解吧:把这个属性设置为false,看起来没有变化,但操作上已经把他完全忽视了,不触发事件,可以直接点到它下面的东西。
这个属性能方便的解决工作中常见的麻烦,比如下面这个例子:
注意上面那部分.效果很简单,就是个渐变的效果.但是这个渐变贯穿了两列,就使得处理起来有点小麻烦.
当然解决方案有很多:
可以写两个ListBoxItem的样式,第一个放顶部有渐变的背景,和右部保持一致,通过样式选择器来实现.这显然比较麻烦.
还可以在大背景下放个渐变,ListBoxItem的上半部分做成透明,这样相对简单,但不一定能实现理想的效果.
IsHitTestVisible属性就很好的解决了这个问题.直接在上层放个border,背景设置成渐变,IsHitTestVisible设置为false.这样就既能看到渐变效果,又能透过border,直接点到ListBoxItem.设置一个属性就解决了问题,非常方便.相当于在上面放了个蒙板,但是这个蒙板能看到却点不到.
类似的我还想到了一个场景:
这个效果顶层是个图片,IsHitTestVisible为false,透明为0.3.
并不是图片是个背景,然后所有控件都是半透明效果.
见代码:
XMAL:
代码语言：javascript复制<Grid>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="70"></RowDefinition>
<RowDefinition></RowDefinition>
<RowDefinition Height="50"></RowDefinition>
</Grid.RowDefinitions>
<Border Background="#555F5F">
<Label Content="logo" Foreground="White"></Label>
</Border>
<Grid Grid.Row="1" Background="#AAAFAF">
<StackPanel HorizontalAlignment="Center" VerticalAlignment="Center" Button.Click="StackPanel_Click">
<Button Width="132" Height="32" Content="金闪闪" Margin="10"></Button>
<Button Width="132" Height="32" Content="小圆" Margin="10"></Button>
</StackPanel>
<Label Content="我不透明" Background="Green" Foreground="Blue" Width="100" Height="100" Margin="76,29,266,171"></Label>
<Label Content="我不透明" Background="Red" Foreground="Blue" Width="100" Height="40" Margin="112,40,230,220"></Label>
</Grid>
<Border Grid.Row="2" Background="#555F5F">
<Label Content="状态栏" Foreground="White"></Label>
</Border>
</Grid>
<Image Name="img" HorizontalAlignment="Center" VerticalAlignment="Center" Width="0" Height="0" Source="/Image/jinshanshan.jpg" Stretch="Fill" Opacity="0.1" IsHitTestVisible="False"></Image>
</Grid>
后台:
代码语言：javascript复制private void StackPanel_Click(object sender, RoutedEventArgs e)
{
Button btn = (Button)e.OriginalSource;
string content = btn.Content.ToString();
if (content == "金闪闪")
{
img.Source = new BitmapImage(new Uri(@"/Image/jinshanshan.jpg", UriKind.Relative));
}
if (content == "小圆")
{
img.Source = new BitmapImage(new Uri(@"/Image/xiaoyuan.jpg", UriKind.Relative));
}
DoubleAnimation daX = new DoubleAnimation();
daX.From = 0;
daX.To = 400;
daX.FillBehavior = FillBehavior.HoldEnd;
Storyboard.SetTarget(daX, img);
Storyboard.SetTargetProperty(daX, new PropertyPath(Image.WidthProperty));
DoubleAnimation daY = new DoubleAnimation();
daY.From = 0;
daY.To = 400;
daY.FillBehavior = FillBehavior.HoldEnd;
Storyboard.SetTarget(daY, img);
Storyboard.SetTargetProperty(daY, new PropertyPath(Image.HeightProperty));
DoubleAnimation daOp = new DoubleAnimation();
daOp.From = 1;
daOp.To = 0.3;
daOp.FillBehavior = FillBehavior.HoldEnd;
Storyboard.SetTarget(daOp, img);
Storyboard.SetTargetProperty(daOp, new PropertyPath(Image.OpacityProperty));
Storyboard sb = new Storyboard();
sb.Children.Add(daX);
sb.Children.Add(daY);
sb.Children.Add(daOp);
sb.Begin();
}
