我想从ViewModel层触发动画，所以我创建了一个布尔DependencyProperty和一个绑定到它的DataTrigger。
动画结束后，我想将DependencyProperty值重置为False，这样我就可以再次触发动画，但这似乎不起作用，DependencyProperty永远不会设置为False。
DP声明：
public bool SlidingInLeft {
get { return (bool)GetValue(SlidingInLeftProperty); }
set {
Console.WriteLine("SlidingInLeft: " + value);
SetValue(SlidingInLeftProperty, value);
}
}
public static readonly DependencyProperty SlidingInLeftProperty =
DependencyProperty.Register("SlidingInLeft", typeof(bool), typeof(OperationsListPageVM), new PropertyMetadata(false));
XAML：
<DataTrigger Binding="{Binding SlidingInLeft}" Value="True">
<DataTrigger.EnterActions>
<BeginStoryboard>
<Storyboard>
<DoubleAnimation Storyboard.TargetProperty="(UserControl.RenderTransform).(TranslateTransform.X)" SpeedRatio=".25" From="2000" To="0" Duration="0:0:.25" />
<ObjectAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetProperty="(UserControl.Visibility)">
<DiscreteObjectKeyFrame KeyTime="00:00:00" Value="{x:Static Visibility.Visible}"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</DataTrigger.EnterActions>
<DataTrigger.ExitActions>
<BeginStoryboard>
<Storyboard>
<BooleanAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetProperty="SlidingInLeft">
<DiscreteBooleanKeyFrame KeyTime="00:00:00" Value="False"/>
</BooleanAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</DataTrigger.ExitActions>
</DataTrigger>
（请注意，DataContext设置为ViewModel对象）
编辑：＆＃34;整体＆＃34;代码，如果它可以提供任何帮助：
OperationsListPageVM.cs：
namespace MaintenanceModule.ViewModel {
public class OperationsListPageVM : DependencyObject, INotifyPropertyChanged {
#region propriétés
public ObservableCollection<OperationVM> AllOperations { get; set; }
public ObservableCollection<OperationVM> DisplayedOperations { get; set; }
public static OperationsListPageVM Instance { get; private set; }
public IPageVM PreviousPage { get; set; }
public IPageVM NextPage { get; set; }
public bool SlidingInLeft {
get { return (bool)GetValue(SlidingInLeftProperty); }
set {
Console.WriteLine("SlidingInLeft: " + value);
SetValue(SlidingInLeftProperty, value);
}
}
public static readonly DependencyProperty SlidingInLeftProperty =
DependencyProperty.Register("SlidingInLeft", typeof(bool), typeof(OperationsListPageVM), new PropertyMetadata(false));
#endregion
#region singleton
private OperationsListPageVM() {
AllOperations = new ObservableCollection<OperationVM>();
AllOperations.CollectionChanged += (sender, args) => {
switch (args.Action) {
case NotifyCollectionChangedAction.Add:
foreach (OperationVM ovm in args.NewItems) {
DisplayedOperations.Add(ovm);
}
break;
}
};
DisplayedOperations = new ObservableCollection<OperationVM>();
}
public static OperationsListPageVM GetInstance() {
return Instance ?? (Instance = new OperationsListPageVM());
}
#endregion
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void onPropertyChanged(string propertyName) {
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
}
}
}
OperationsListPageV.xaml：
<UserControl x:Class="MaintenanceModule.View.Pages.OperationsListPageV"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:lib="clr-namespace:TactileWPFComponents;assembly=TactileWPFComponents"
xmlns:viewModel="clr-namespace:MaintenanceModule.ViewModel"
DataContext="{Binding RelativeSource={RelativeSource self}, Path=OperationsListPage}">
<UserControl.Style>
<Style>
<Setter Property="UserControl.RenderTransform">
<Setter.Value>
<TranslateTransform/>
</Setter.Value>
</Setter>
<Style.Triggers>
<DataTrigger Binding="{Binding SlidingInLeft}" Value="True">
<DataTrigger.EnterActions>
<BeginStoryboard>
<Storyboard>
<DoubleAnimation Storyboard.TargetProperty="(UserControl.RenderTransform).(TranslateTransform.X)" SpeedRatio="1" From="2000" To="0" Duration="0:0:.25" />
<ObjectAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetProperty="(UserControl.Visibility)">
<DiscreteObjectKeyFrame KeyTime="00:00:00" Value="{x:Static Visibility.Visible}"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</DataTrigger.EnterActions>
<DataTrigger.ExitActions>
<BeginStoryboard>
<Storyboard>
<BooleanAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetProperty="SlidingInLeft">
<DiscreteBooleanKeyFrame KeyTime="00:00:00" Value="False"/>
</BooleanAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</DataTrigger.ExitActions>
</DataTrigger>
</Style.Triggers>
</Style>
</UserControl.Style>
<Grid>
<Grid.Background>
<ImageBrush ImageSource="../../Resources/Images/GlassBlockZoneRecipeFlow.png"/>
</Grid.Background>
<lib:ScrollViewerFriction Margin="0, 20">
<lib:WatchList ItemsSource="{Binding DisplayedOperations}" Margin="20">
<lib:WatchList.Resources>
<LinearGradientBrush x:Key="{x:Static SystemColors.ControlBrushKey}">
<GradientStop Offset="0.0" Color="Transparent"/>
<GradientStop Offset="0.25" Color="Gray"/>
<GradientStop Offset="0.5" Color="Transparent"/>
<GradientStop Offset="0.75" Color="Gray"/>
<GradientStop Offset="1.0" Color="Transparent"/>
</LinearGradientBrush>
<Style x:Key="StyleListBoxItem" TargetType="ListBoxItem">
<Style.Resources>
<LinearGradientBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" StartPoint="0,0" EndPoint="0,1">
<LinearGradientBrush.RelativeTransform>
<RotateTransform Angle="-90"/>
</LinearGradientBrush.RelativeTransform>
<GradientStop Offset="0.0" Color="Transparent"/>
<GradientStop Offset="0.25" Color="Gray"/>
<GradientStop Offset="0.5" Color="Transparent"/>
<GradientStop Offset="0.75" Color="Gray"/>
<GradientStop Offset="1.0" Color="Transparent"/>
</LinearGradientBrush>
</Style.Resources>
<Setter Property="HorizontalContentAlignment" Value="Stretch"/>
</Style>
</lib:WatchList.Resources>
<ListBox.BorderThickness>0</ListBox.BorderThickness>
<ListBox.ItemContainerStyle>
<Style BasedOn="{StaticResource StyleListBoxItem}" TargetType="ListBoxItem"/>
</ListBox.ItemContainerStyle>
<lib:WatchList.ItemTemplate>
<DataTemplate DataType="viewModel:OperationVM">
<Grid Margin="0, 10">
<Grid.Resources>
<Style TargetType="TextBlock">
<Setter Property="Foreground" Value="#050670"/>
<Setter Property="FontSize" Value="15"/>
<Setter Property="TextAlignment" Value="Center"/>
<Setter Property="TextWrapping" Value="WrapWithOverflow"/>
<Setter Property="VerticalAlignment" Value="Center"/>
</Style>
</Grid.Resources>
<Grid.Background>
<ImageBrush ImageSource="../../Resources/Images/Frame4.png"/>
</Grid.Background>
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="10"/>
<ColumnDefinition/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<Grid Grid.Column="0" Grid.Row="0" Grid.RowSpan="2" Background="{Binding Color}"/>
<TextBlock Grid.Row="0" Grid.Column="1" Text="{Binding Name}"/>
<TextBlock Grid.Row="0" Grid.Column="2" Text="{Binding CycleDuration}"/>
<TextBlock Grid.Row="1" TextElement.FontSize="8" HorizontalAlignment="Left" Grid.Column="1" Text="{Binding EstimatedDate, StringFormat='{}{0:D}'}"/>
<StackPanel Grid.Row="1" Grid.Column="2">
<ProgressBar Height="20" Width="100" Maximum="100" Minimum="0" Orientation="Horizontal" Value="{Binding CyclePercentage}"/>
<TextBlock Text="{Binding CyclePercentage, StringFormat=\{0:N0\}%}"/>
</StackPanel>
</Grid>
</DataTemplate>
</lib:WatchList.ItemTemplate>
</lib:WatchList>
</lib:ScrollViewerFriction>
</Grid>
</UserControl>
OperationsListPageV.xaml.cs：
namespace MaintenanceModule.View.Pages {
public partial class OperationsListPageV : UserControl, IPageV {
public OperationsListPageVM OperationsListPage { get; set; }
public OperationsListPageV() {
OperationsListPage = OperationsListPageVM.GetInstance();
InitializeComponent();
}
}
}
答案 0 :(得分：0)
试试这个：
在XAML中：
<Storyboard Completed="Storyboard_Completed" >
private void Storyboard_Completed(object sender, EventArgs e)
{
SetValue(SlidingInLeftProperty, false);
}