WPF或Silverlight中的屏幕闪烁效果

Question

我正在寻找一种方法来为我正在研究的全屏WPF应用程序创建一个"看起来很酷"的效果 - 一种"屏幕闪烁"效果,可以在整个屏幕上激活或移动,从而发出闪亮的显示体验.我正在考虑创建一个带有突出显示渐变和透明背景的大矩形,可以在屏幕上进行动画制作.有任何想法如何在XAML中有效地完成这项工作？

Answer 1

我提出了一个看起来很不错的解决方案.我在Blend 2.0 SP1中编写的一些示例XAML如下所示:

<Window
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Class="ScreenGlintApplication.Window1"
    x:Name="Window"
    Title="Window1"
    Width="500" Height="250" Background="#FF000000" Foreground="#FF3EE229" >

    <Grid x:Name="LayoutRoot">
        <TextBlock TextWrapping="Wrap" FontSize="40" >
        <Run Text="This is some sample text to have something to work with. Have a nice day! /Johan"/>
        </TextBlock>
        <Canvas Panel.ZIndex="99" >
        <Rectangle x:Name="ScreenGlintRect"  
            Width="{Binding Path=ActualWidth, ElementName=Window, Mode=Default}" 
            Height="{Binding Path=ActualHeight, ElementName=Window, Mode=Default}" 
            Opacity="0.4" >
            <Rectangle.Triggers> 
                <EventTrigger RoutedEvent="Rectangle.Loaded"> 
                  <BeginStoryboard> 
                    <Storyboard> 
                    <DoubleAnimation Storyboard.TargetName="ScreenGlintRect" 
                    Storyboard.TargetProperty="(Canvas.Left)"
                    From="-500" To="1000" Duration="0:0:2" />
                    </Storyboard> 
                  </BeginStoryboard> 
                </EventTrigger> 
          </Rectangle.Triggers> 

            <Rectangle.Fill>
                <LinearGradientBrush StartPoint="0,1" EndPoint="1,1">
                    <GradientStop Color="Transparent" Offset="0.0" />
                    <GradientStop x:Name="GlintColor" Color="LightGreen" Offset="0.50" />
                    <GradientStop Color="Transparent" Offset="1" />
                </LinearGradientBrush>
            </Rectangle.Fill>
        </Rectangle>
        </Canvas>
    </Grid>
</Window>

一个选项是在后面的代码中执行此操作,如果您想要对动画进行精细控制,这非常简洁.例如:

    ScreenGlintRect.Width = Width;
    ScreenGlintRect.Height = Height;
    var animation = new DoubleAnimation
    {
        Duration = new Duration(TimeSpan.FromSeconds(2)),
        From = (-Width),
        To = Width * 2
    };
    ScreenGlintRect.BeginAnimation(Canvas.LeftProperty, animation);

这是我正在使用的代码,它对我来说看起来不错.如果你有硬件加速,你可以尝试添加一些模糊.您可能需要调整代码并隐藏/显示矩形,但基本上就是这样.