我有一个非常简单的 wpftoolkit:datagrid 来显示股票市场的出价和要价。
我的网格绑定到ObservableCollection<PriceViewModel>. My PriceViewModel实施INotifyPropertyChanged.
网格正确更新，我已经设法使背景颜色具有动画效果，但在应用动画时它是间歇性的。
下面是视图模型类的 XAML 和片段。
这个想法只是当价格更新低于之前的价格时将颜色设为红色，当价格更新的价格高于之前时将颜色设为绿色……没什么太花哨的。
<WpfToolkit:DataGrid Name="PriceDataGrid" RowHeaderWidth="5"
AutoGenerateColumns="False" VerticalContentAlignment="Center" Margin="0,33,0,0" HorizontalAlignment="Left" Width="868">
<WpfToolkit:DataGrid.Columns>
<WpfToolkit:DataGridTemplateColumn Header="Bid" MinWidth="40">
<WpfToolkit:DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<TextBlock Text="{Binding Bid}" Margin="3,1" x:Name="txtTextBlock">
<TextBlock.Background>
<SolidColorBrush Color="Transparent"></SolidColorBrush>
</TextBlock.Background>
</TextBlock>
<DataTemplate.Triggers>
<DataTrigger Binding="{Binding BidUp}" Value="True">
<DataTrigger.EnterActions>
<BeginStoryboard>
<Storyboard>
<ColorAnimation
BeginTime="00:00:00"
Duration="0:0:0.1"
To="Green"
AutoReverse="True"
Storyboard.TargetName="txtTextBlock"
Storyboard.TargetProperty="(TextBlock.Background).(SolidColorBrush.Color)">
</ColorAnimation>
</Storyboard>
</BeginStoryboard>
</DataTrigger.EnterActions>
</DataTrigger>
<DataTrigger Binding="{Binding BidDown}" Value="True">
<DataTrigger.EnterActions>
<BeginStoryboard>
<Storyboard>
<ColorAnimation
BeginTime="00:00:00"
Duration="0:0:0.1"
To="Red"
AutoReverse="True"
Storyboard.TargetName="txtTextBlock"
Storyboard.TargetProperty="(TextBlock.Background).(SolidColorBrush.Color)">
</ColorAnimation>
</Storyboard>
</BeginStoryboard>
</DataTrigger.EnterActions>
</DataTrigger>
</DataTemplate.Triggers>
</DataTemplate>
</WpfToolkit:DataGridTemplateColumn.CellTemplate>
</WpfToolkit:DataGridTemplateColumn>
<WpfToolkit:DataGridTextColumn Header="Ask" Binding="{Binding Path=Ask}" MinWidth="40" />
</WpfToolkit:DataGrid.Columns>
</WpfToolkit:DataGrid>
和视图模型：
public class PriceViewModel : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
Price _price;
private bool _bidUp = false;
private bool _bidDown = false;
public bool BidUp
{
get
{
return _bidUp;
}
set
{
_bidUp = value;
OnPropertyChanged("BidUp");
}
}
public bool BidDown
{
get
{
return _bidDown;
}
set
{
_bidDown = value;
OnPropertyChanged("BidDown");
}
}
public double Bid
{
get { return _price.Bid; }
set
{
BidUp = (value > _price.Bid);
BidDown = (value < _price.Bid);
_price.Bid = value;
OnPropertyChanged("Bid");
}
}
public double Ask
{
get { return _price.Ask; }
set
{
AskUp = (value > _price.Ask);
_price.Ask = value;
OnPropertyChanged("Ask");
}
}
public PriceViewModel(Price price)
{
_price = price;
}
private void OnPropertyChanged(string propertyName)
{
if(PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
我尝试过这个，如果你停止它似乎效果更好Storyboard在开始新的一项之前。停止一个Storyboard，命名并调用
<StopStoryboard BeginStoryboardName="bidUpStoryboard"/>
像这样尝试一下
<DataTemplate.Triggers>
<DataTrigger Binding="{Binding BidUp}" Value="True">
<DataTrigger.EnterActions>
<StopStoryboard BeginStoryboardName="bidUpStoryboard"/>
<StopStoryboard BeginStoryboardName="bidDownStoryboard"/>
<BeginStoryboard Name="bidUpStoryboard">
<Storyboard BeginTime="00:00:00">
<ColorAnimation
BeginTime="00:00:00"
Duration="0:0:0.1"
To="Green"
AutoReverse="True"
Storyboard.TargetName="txtTextBlock"
Storyboard.TargetProperty="(TextBlock.Background).(SolidColorBrush.Color)">
</ColorAnimation>
</Storyboard>
</BeginStoryboard>
</DataTrigger.EnterActions>
</DataTrigger>
<DataTrigger Binding="{Binding BidDown}" Value="True">
<DataTrigger.EnterActions>
<StopStoryboard BeginStoryboardName="bidUpStoryboard"/>
<StopStoryboard BeginStoryboardName="bidDownStoryboard"/>
<BeginStoryboard Name="bidDownStoryboard">
<Storyboard BeginTime="00:00:00">
<ColorAnimation
BeginTime="00:00:00"
Duration="0:0:0.1"
To="Red"
AutoReverse="True"
Storyboard.TargetName="txtTextBlock"
Storyboard.TargetProperty="(TextBlock.Background).(SolidColorBrush.Color)">
</ColorAnimation>
</Storyboard>
</BeginStoryboard>
</DataTrigger.EnterActions>
</DataTrigger>
</DataTemplate.Triggers>
另外，如果BidUp连续两次设置为 true ，第二次不会触发，因为它会从 true 变为 true，所以如果你希望每次值更改时都出现闪烁效果，则必须将其设置为 false某个点。例如
public double Bid
{
get { return _price.Bid; }
set
{
BidUp = false;
BidDown = false;
BidUp = (value > _price.Bid);
BidDown = (value < _price.Bid);
_price.Bid = value;
OnPropertyChanged("Bid"); }
}
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