C# WPF动画自动停止
我有一个WPF应用程序,其中包含一个UserControl,其边框是动画的:C# WPF动画自动停止,c#,wpf,animation,C#,Wpf,Animation,我有一个WPF应用程序,其中包含一个UserControl,其边框是动画的: <UserControl x:Class="CarSystem.CustomControls.AlarmItem" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
<UserControl x:Class="CarSystem.CustomControls.AlarmItem"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:cs="clr-namespace:CarSystem.CustomControls"
mc:Ignorable="d"
DataContext="{Binding Path=Alarm, RelativeSource={RelativeSource Self}}">
<UserControl.Resources>
<Style TargetType="{x:Type cs:AlarmItem}">
<Setter Property="IsFlashing" Value="False" />
<Style.Triggers>
<DataTrigger Binding="{Binding Path=IsExpired}" Value="True">
<Setter Property="IsFlashing" Value="True" />
</DataTrigger>
<DataTrigger Binding="{Binding Path=IsPending}" Value="True">
<Setter Property="IsFlashing" Value="True" />
</DataTrigger>
</Style.Triggers>
</Style>
</UserControl.Resources>
<Border HorizontalAlignment="Center"
Margin="5"
Height="100"
Name="Border"
VerticalAlignment="Center"
Width="100">
<Border.Resources>
<Storyboard x:Key="FlashingStoryboard"
AutoReverse="True"
RepeatBehavior="Forever">
<ColorAnimationUsingKeyFrames BeginTime="00:00:00"
Duration="00:00:00.5"
Storyboard.TargetName="Border"
Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)">
<DiscreteColorKeyFrame KeyTime="00:00:00.25" Value="Black" />
</ColorAnimationUsingKeyFrames>
</Storyboard>
</Border.Resources>
<Border.Style>
<Style TargetType="Border">
<Setter Property="BorderBrush" Value="Black" />
<Setter Property="BorderThickness" Value="2" />
<Style.Triggers>
<DataTrigger Binding="{Binding Path=IsExpired}" Value="True">
<Setter Property="BorderThickness" Value="4" />
</DataTrigger>
<DataTrigger Binding="{Binding Path=IsPending}" Value="True">
<Setter Property="BorderThickness" Value="4" />
</DataTrigger>
</Style.Triggers>
</Style>
</Border.Style>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="FlashStates">
<VisualState x:Name="FlashingOn"
Storyboard="{StaticResource ResourceKey=FlashingStoryboard}" />
<VisualState x:Name="FlashingOff" />
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Image Grid.Row="0"
Name="AlarmImage"
Source="{Binding Path=Image, RelativeSource={RelativeSource AncestorType={x:Type cs:AlarmItem}}}"
Stretch="Fill" />
<cs:ResponseTimer Expired="Timer_Expired"
Grid.Row="1"
HideIfExpired="True"
IsTabStop="False"
MinHeight="10"
x:Name="TheTimer"
TimeoutPeriod="00:02:30"
VerticalAlignment="Bottom" />
</Grid>
</Border>
</UserControl>
该应用程序从我公司生产的专有设备接收数据。对象将被接收并加载到视图模型类实例中。为接收到的每个对象创建此控件的新实例,将对视图模型的引用放入新控件实例的DataContext
属性中,并将新控件添加到窗口中的列表框中
动画应该在对象的状态属性为特定值时运行。还有第二个状态值,其中动画也应该运行,并且在用户未响应该项目的固定时间间隔后,状态将更改为该值。只有当状态具有只能由用户交互设置的值时,动画才会停止
接收并显示第一个对象时,动画工作正常。如果没有收到其他对象,动画将继续运行&当计时器过期时,边框颜色将按预期进行更改
但是,在接收到2个或多个对象后,动画将自行停止。这是在更改导致边框颜色更改的状态的计时器过期之前,以及在采取任何用户操作之前。请注意,它并不总是在第二个对象上停止,有时需要在动画停止之前接收3或4个对象
有人知道为什么动画停止了吗?我如何让每个人都跑到底?有没有更好的方法来获得相同的效果而不存在此问题?我遇到过的最接近这种情况是根据视图模型中的值触发动画。我在这里选择了“更好的方式”,所以如果这不符合您的解决方案,我很抱歉,我只是根据我所看到的来道歉
现在您提到为来自外部设备的每个警报创建一个新控件?因此,我将假设该控件绑定到单个实例,并以类似列表框的形式显示
如果你还和我在一起,你的控件实例有它自己的视图模型实例,从外观上看,你从IsPending和IsExpired属性触发,当其中一个为真时,让它闪烁
我要做的第一件事是简化ViewModel添加为IsAlertRequired属性的绑定,该属性是在需要警报时设置的,可以在setter中为现有属性更新。这里的原因是单个触发器比多重绑定容易得多
然后使用DataTrigger启动故事板。在应用程序中添加对Microsoft.Expression.Interactions的引用,然后将其导入到XAML中:
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions"
然后在layoutroot元素之前添加触发器:
<i:Interaction.Triggers>
<ei:DataTrigger Binding="{Binding ViewModel.IsAlertRequired}" Value="True">
<ei:ControlStoryboardAction ControlStoryboardOption="Play" Storyboard="{StaticResource FlashingAnimation}"/>
</ei:DataTrigger>
这将基于视图模型数据绑定启动动画
假设你走了那么远,并且它可以开始你的动画,如果它仍然停止,那么我会检查viewmodel或外部组件中是否有东西阻塞了UI线程
希望这能有所帮助。感谢kidshaw提供的信息,我找到了一个可行的解决方案。本质上,动画应该在两种颜色之间来回切换边框
控件的边框笔刷
,黑色和一种颜色取决于数据上下文中对象的属性。这个逻辑在代码隐藏中,因为这个逻辑依赖于数据上下文对象的两个不同属性,我无法想出一个正常工作的XAML触发器。它没有包含在原始问题中,因为它似乎不相关
正如kidshaw回答的评论中所提到的,问题是当窗口中出现额外的警报时,动画无法跟踪边框笔刷的颜色。例如,它不会在红色和黑色之间来回切换,而是认为它必须在黑色和黑色或红色和红色之间切换。所以看起来好像没有动画片发生,实际上是这样
为了解决这个问题,并且由于需要根据数据上下文中对象的属性选择颜色,我最终为另一种颜色的动画添加了第二个DiscreteColorKeyFrame
。我尝试将DiscreteColorKeyFrame
的值
属性绑定到我添加到控件的DependencyProperty
,该属性将由代码隐藏逻辑设置,但不起作用。动画不断在黑色和透明之间来回切换,而VS中的输出窗口不断记录有关CanFreeze
为false的错误
因此,我最终为每种不同的颜色制作了一个动画,并为每种颜色向VisualStateManager
添加了一个VisualState
。后面的代码也发生了变化,bu tI让一切都正常工作了
以下是XAML:
<UserControl x:Class="CarSystem.CustomControls.AlarmItem"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:cs="clr-namespace:CarSystem.CustomControls"
mc:Ignorable="d"
DataContext="{Binding Path=Alarm, RelativeSource={RelativeSource Self}}">
<UserControl.Resources>
<Style TargetType="{x:Type cs:AlarmItem}">
<Setter Property="IsFlashing" Value="False" />
<Style.Triggers>
<DataTrigger Binding="{Binding Path=IsExpired}" Value="True">
<Setter Property="IsFlashing" Value="True" />
</DataTrigger>
<DataTrigger Binding="{Binding Path=IsPending}" Value="True">
<Setter Property="IsFlashing" Value="True" />
</DataTrigger>
</Style.Triggers>
</Style>
</UserControl.Resources>
<Border HorizontalAlignment="Center"
Margin="5"
Height="100"
Name="Border"
VerticalAlignment="Center"
Width="100">
<Border.BorderBrush>
<SolidColorBrush x:Name="AnimatedBrush" Color="Black" />
</Border.BorderBrush>
<Border.Resources>
<Storyboard x:Key="ExpiredAnimation"
AutoReverse="False"
RepeatBehavior="Forever">
<ColorAnimationUsingKeyFrames BeginTime="00:00:00"
Duration="00:00:01"
Storyboard.TargetName="AnimatedBrush"
Storyboard.TargetProperty="Color">
<DiscreteColorKeyFrame KeyTime="00:00:00" Value="#FFFFFF78" />
<DiscreteColorKeyFrame KeyTime="00:00:00.5" Value="Black" />
</ColorAnimationUsingKeyFrames>
</Storyboard>
<Storyboard x:Key="HistoricalAnimation"
AutoReverse="False"
RepeatBehavior="Forever">
<ColorAnimationUsingKeyFrames BeginTime="00:00:00"
Duration="00:00:01"
Storyboard.TargetName="AnimatedBrush"
Storyboard.TargetProperty="Color">
<DiscreteColorKeyFrame KeyTime="00:00:00" Value="#FFFFFF78" />
<DiscreteColorKeyFrame KeyTime="00:00:00.5" Value="Black" />
</ColorAnimationUsingKeyFrames>
</Storyboard>
<Storyboard x:Key="PendingAnimation"
AutoReverse="False"
RepeatBehavior="Forever">
<ColorAnimationUsingKeyFrames BeginTime="00:00:00"
Duration="00:00:01"
Storyboard.TargetName="AnimatedBrush"
Storyboard.TargetProperty="Color">
<DiscreteColorKeyFrame KeyTime="00:00:00" Value="Red" />
<DiscreteColorKeyFrame KeyTime="00:00:00.5" Value="Black" />
</ColorAnimationUsingKeyFrames>
</Storyboard>
<Storyboard x:Key="WhiteListAnimation"
AutoReverse="False"
RepeatBehavior="Forever">
<ColorAnimationUsingKeyFrames BeginTime="00:00:00"
Duration="00:00:01"
Storyboard.TargetName="AnimatedBrush"
Storyboard.TargetProperty="Color">
<DiscreteColorKeyFrame KeyTime="00:00:00" Value="#FF5819" />
<DiscreteColorKeyFrame KeyTime="00:00:00.5" Value="Black" />
</ColorAnimationUsingKeyFrames>
</Storyboard>
</Border.Resources>
<Border.Style>
<Style TargetType="Border">
<Setter Property="BorderThickness" Value="2" />
<Style.Triggers>
<DataTrigger Binding="{Binding Path=IsExpired}" Value="True">
<Setter Property="BorderThickness" Value="4" />
</DataTrigger>
<DataTrigger Binding="{Binding Path=IsPending}" Value="True">
<Setter Property="BorderThickness" Value="4" />
</DataTrigger>
</Style.Triggers>
</Style>
</Border.Style>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="FlashStates">
<VisualState x:Name="ExpiredState" Storyboard="{StaticResource ResourceKey=ExpiredAnimation}" />
<VisualState x:Name="HistoricalState" Storyboard="{StaticResource ResourceKey=HistoricalAnimation}" />
<VisualState x:Name="PendingState" Storyboard="{StaticResource ResourceKey=PendingAnimation}" />
<VisualState x:Name="WhiteListState" Storyboard="{StaticResource ResourceKey=WhiteListAnimation}" />
<VisualState x:Name="FlashingOff" />
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Image Grid.Row="0"
Name="AlarmImage"
Source="{Binding Path=Image, RelativeSource={RelativeSource AncestorType={x:Type cs:AlarmItem}}}"
Stretch="Fill" />
<cs:ResponseTimer Expired="Timer_Expired"
Grid.Row="1"
HideIfExpired="True"
IsTabStop="False"
MinHeight="10"
x:Name="TheTimer"
TimeoutPeriod="00:02:30"
VerticalAlignment="Bottom" />
</Grid>
</Border>
</UserControl>
请注意,数据上下文对象属性的值可能会因用户交互或计时器过期而更改,在第一种情况下,计时器将一起停止闪烁,或者
private void StartStatusAnimation() {
if ( condition1 ) {
// It is. Display the WhiteListAnimation.
if ( !VisualStateManager.GoToElementState( Border, "WhiteListState", true ) ) {
// Log error
}
} else if ( condition2 ) {
if ( !VisualStateManager.GoToElementState( Border, "ExpiredState", true ) ) {
// Log error
}
} else if ( condition3 ) {
if ( !VisualStateManager.GoToElementState( Border, "HistoricalState", true ) ) {
// Log error
}
} else if ( condition4 ) {
if ( !VisualStateManager.GoToElementState( Border, "PendingState", true ) ) {
// Log error
}
} else {
// We don't know what state this is. Stop flashing now
if ( !VisualStateManager.GoToElementState( Border, "FlashingOff", true ) ) {
// Log error
}
}
}