所有,在前一个问题的答案https://stackoverflow.com/a/18136371/626442中,答案提供了解决我的动画未触发的问题。代码是
<DataTemplate x:Key="readOnlyCellUpdatedStyle">
<TextBlock Text="{Binding KeyIndex, Mode=TwoWay,NotifyOnTargetUpdated=True}">
<TextBlock.Style>
<Style TargetType="TextBlock">
<Setter Property="Background" Value="White"/>
<Style.Triggers>
<EventTrigger RoutedEvent="Binding.TargetUpdated">
<BeginStoryboard>
<Storyboard>
<ColorAnimation Storyboard.TargetProperty="Background.Color"
Duration="0:0:0.3"
From="White"
To="Red"
RepeatBehavior="3x"
AutoReverse="True"/>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Style.Triggers>
</Style>
</TextBlock.Style>
</TextBlock>
</DataTemplate>
当我通过ViewModel更新KeyIndex
列时,会触发动画。但是,我只希望DataGridTextColumn
的单元格的动画在更新值时设置动画,但是当滚动DataGrid
时它们也会触发。我被建议
使用您需要内置的功能创建派生
DataGridTextColumn
可能是更好的选择,因为如果您使用虚拟化,使用TargetUpdated
几乎是不可能的。但如果您制作了自定义DataGridTextColumn
,那么您应该可以使其正常运行。
如何创建自定义/派生的`DataGridTextColumn(我也可以混合使用)?
我不知道如何做到这一点,关于这个特定概念的文档很少。
感谢您的时间。
答案 0 :(得分:3)
使用Virtualization
时,VirtualizationMode="Recycling"
使用TextBlock
非常困难
我找到了一种方法,通过派生PropertyChanged
并附加到绑定对象的public class VirtualizingNotifyTextBlock : TextBlock
{
private INotifyPropertyChanged _dataItem;
private string _propertyName;
public VirtualizingNotifyTextBlock()
: base()
{
this.TargetUpdated += NotifyTextBlock_TargetUpdated;
}
public static readonly RoutedEvent PropertyChangedEvent = EventManager.RegisterRoutedEvent("PropertyChanged", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(VirtualizingNotifyTextBlock));
public static readonly DependencyProperty NotifyDurationProperty = DependencyProperty.Register("NotifyDuration", typeof(int), typeof(VirtualizingNotifyTextBlock), new PropertyMetadata(300));
public static readonly DependencyProperty NotifyRepeatProperty = DependencyProperty.Register("NotifyRepeat", typeof(int), typeof(VirtualizingNotifyTextBlock), new PropertyMetadata(3));
public static readonly DependencyProperty NotifyColorProperty = DependencyProperty.Register("NotifyColor", typeof(Color), typeof(VirtualizingNotifyTextBlock), new PropertyMetadata(Colors.Red));
public Color NotifyColor
{
get { return (Color)GetValue(NotifyColorProperty); }
set { SetValue(NotifyColorProperty, value); }
}
public int NotifyDuration
{
get { return (int)GetValue(NotifyDurationProperty); }
set { SetValue(NotifyDurationProperty, value); }
}
public int NotifyRepeat
{
get { return (int)GetValue(NotifyRepeatProperty); }
set { SetValue(NotifyRepeatProperty, value); }
}
public INotifyPropertyChanged DataItem
{
get { return _dataItem; }
set
{
if (_dataItem != null)
{
Background = new SolidColorBrush(Colors.Transparent);
_dataItem.PropertyChanged -= DataItem_PropertyChanged;
}
_dataItem = value;
if (_dataItem != null)
{
_dataItem.PropertyChanged += DataItem_PropertyChanged;
}
}
}
private void NotifyTextBlock_TargetUpdated(object sender, DataTransferEventArgs e)
{
var binding = this.GetBindingExpression(VirtualizingNotifyTextBlock.TextProperty);
if (binding != null)
{
_propertyName = binding.ResolvedSourcePropertyName;
DataItem = binding.DataItem as INotifyPropertyChanged;
}
}
private void DataItem_PropertyChanged(object sender, PropertyChangedEventArgs e)
{
if (e.PropertyName == _propertyName)
{
var animation = new ColorAnimation(NotifyColor, new Duration(TimeSpan.FromMilliseconds(NotifyDuration)));
animation.RepeatBehavior = new RepeatBehavior(NotifyRepeat);
animation.AutoReverse = true;
Background = new SolidColorBrush(Colors.Transparent);
Background.BeginAnimation(SolidColorBrush.ColorProperty, animation);
}
}
}
事件来使其工作。
当值更改时,播放动画,但如果滚动已回收的项目,则不会继续播放动画。
这是一个非常粗略的例子,但我相信你可以根据自己的需要进行清理和修改。
的TextBlock:
<DataTemplate x:Key="readOnlyCellUpdatedStyle">
<local:VirtualizingNotifyTextBlock Text="{Binding KeyIndex, NotifyOnTargetUpdated=True}" NotifyColor="Blue" NotifyDuration="250" NotifyRepeat="4" />
</DataTemplate>
的Xaml:
{{1}}