Question

How might i create a trigger for a Silverlight datagrid in which the cell background color changes based on the cell value? I worked on a WPF project sometime ago and I recall this was quite simple via DataTriggers in the xaml. However this functionality doesn t appear to be available in Silverlight and i m stuck as to where to start.

感谢大家。

Answer 1

第一,更换银灯的触发器是视觉国家感召器。全民公决实际上比起触发作用要强大得多,因为它允许你在国家变化时执行故事。

如果你不需要估计你的情况,那么我如何解决这个问题,将采用一种四轮运输机。在数据模板中建立边界,并将背景rush忙与你想要改变背景的影子财产联系起来。

    public class BrushConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
       value.ToString() == "Red" ? new SolidColorBrush(Color.Red) : SolidColorBrush(Color.Blue);
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new NotImplementedExcpetion();
    }
}

之后,您的XAML将研究这样的问题:

<Border Background={Binding InterestingProperty,Converter={StaticResource BrushConverter}} />

如果你指定官员需要估计,那么你会再次想读一下视觉国家。你们所做的基本工作是创造有依赖性财产的模版用户或用户群,然后当这种财产改变决定控制应当属于哪个州,并援引视觉国家经理。 The syntax is such as

VisualStateManager.GoToVisualState(yourControlInstance,"TheState",boolUseTransitions);

Answer 2

这是一种使用真实和虚假的粗压的范例。

 public class BoolToBrushConverter:DependencyObject,IValueConverter
  {
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
      if(value is bool && (bool)value)
      {
        return TrueBrush;
      }

  return FalseBrush;
}

public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
  throw new NotImplementedException();
}



public Brush FalseBrush
{
  get { return (Brush)GetValue(FalseBrushProperty); }
  set { SetValue(FalseBrushProperty, value); }
}

// Using a DependencyProperty as the backing store for FalseBrush.  This enables animation, styling, binding, etc...
public static readonly DependencyProperty FalseBrushProperty =
    DependencyProperty.Register("FalseBrush", typeof(Brush), typeof(BoolToBrushConverter), new PropertyMetadata(null));



public Brush TrueBrush
{
  get { return (Brush)GetValue(TrueBrushProperty); }
  set { SetValue(TrueBrushProperty, value); }
}

// Using a DependencyProperty as the backing store for TrueBrush.  This enables animation, styling, binding, etc...

public static readonly DependencyProperty TrueBrushProperty =
    DependencyProperty.Register("TrueBrush", typeof(Brush), typeof(BoolToBrushConverter), new PropertyMetadata(null));}

以及

<UserControl.Resources>
    <converter:BoolToBrushConverter x:Key="enabledToBrushConverter"
               TrueBrush="White" FalseBrush="Gray" />
</UserControl.Resources> 

<TextBlock  Foreground="{Binding Element.IsEnabled,
  Converter={StaticResource enabledToBrushConverter}, ElementName= your_Element}"  />

友情链接