其他元素后面的 Wpf 文本选取框

Question

我制作了一个带有动画文本的消息栏， see the .gif from the animation。就像您可以在前景中看到文本 "fly's" 并隐藏占位符一样。但是我需要前台的占位符。

我的第一个想法是改变动画的区域

doubleAnimation.To = tbInfo.ActualWidth *-1;

至

doubleAnimation.To = boLogo.ActualWidth;

但结果如下所示：version with other animation area。

如何设置占位符在前台，让动画"fly's"在后面？

我的XAML-代码

<Canvas x:Name="canMain" HorizontalAlignment="Stretch" VerticalAlignment="Center">
    <Border x:Name="boLogo" Height="40" Background="Gray" Canvas.Left="0" Canvas.Top="-20">
        <Button Content="Placeholder" Width="90" />
    </Border>
    <TextBlock x:Name="tbInfo" Visibility="Hidden" FontSize="32" FontWeight="Bold"  Padding="5" HorizontalAlignment="Stretch" VerticalAlignment="Center"></TextBlock>
</Canvas>

和显示 window

的代码

public void ShowWindow(string str)
{
    tbInfo.Text = str;
    this.Height = 39;
    this.Width = SystemParameters.WorkArea.Width;
    this.Left = SystemParameters.PrimaryScreenWidth - this.Width;
    this.Show();

    TextMarquee(20);
}

private void TextMarquee(int duration)
{
    double height = canMain.ActualHeight - tbInfo.ActualHeight;
    tbInfo.Margin = new Thickness(0, height / 2, 0, 0);
    DoubleAnimation doubleAnimation = new DoubleAnimation();
    doubleAnimation.From = canMain.ActualWidth;
    doubleAnimation.To = tbInfo.ActualWidth * -1;
    doubleAnimation.RepeatBehavior = RepeatBehavior.Forever;
    doubleAnimation.Duration = new Duration(TimeSpan.FromSeconds(duration));
    tbInfo.BeginAnimation(Canvas.LeftProperty, doubleAnimation);
    tbInfo.Visibility = Visibility.Visible;
}

Answer 1

尝试 Grid.ZIndex:

<Grid x:Name="canMain" >
    <Border x:Name="boLogo" Grid.ZIndex="2">
        <Button Content="Placeholder" />
    </Border>
    <TextBlock x:Name="tbInfo" Grid.ZIndex="1"/>
</Grid>

成为ZIndex = "2"最明显的层。

Answer 2

使用Panel.ZIndex:

<Canvas x:Name="canMain" >
<Border x:Name="boLogo" Panel.ZIndex="2">
    <Button Content="Placeholder" Width="90" />
</Border>
<TextBlock x:Name="tbInfo" Panel.ZIndex="1"></TextBlock>
</Canvas>

https://msdn.microsoft.com/de-de/library/system.windows.controls.panel.zindex%28v=vs.110%29.aspx

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