Question

我已经为Target Type = DataGridColumnHeader实现了过滤器图标样式，并且我在DataGrid中附加了Style。

我的要求是，如果bool Property中的HasFilterIcon中的任何一个获得true，则将ViewModel button DataGridColumnHeader更新为visibility visible否则false

我的XAML风格是

<Style TargetType="{x:Type DataGridColumnHeader}" x:Key="DataGridElementStyle">
   <Setter Property="Template">
      <Setter.Value>
          <ControlTemplate TargetType="{x:Type DataGridColumnHeader}">
              <Button Name="autofilter" Command="{Binding Path=DataContext.FilterPopUpCommand, 
                                  RelativeSource={RelativeSource Mode=FindAncestor, 
                                                  AncestorType={x:Type Window}}}">
                  <Button.CommandParameter>
                      <MultiBinding Converter="{StaticResource MultiValueConverterKey}">
                          <Binding RelativeSource="{ RelativeSource Mode=FindAncestor, 
                                                     AncestorType={x:Type cust:DataGrid}}" />
                          <Binding Path="Column" 
                                   RelativeSource="{RelativeSource Mode=TemplatedParent}" />
                      </MultiBinding>
                  </Button.CommandParameter>
              </Button>
              <ControlTemplate.Triggers>
                    <MultiTrigger>
                        <MultiTrigger.Conditions>
                            <Condition Property="IsMouseOver" Value="True"></Condition>
                        </MultiTrigger.Conditions>
                        <Setter TargetName="autofilter" Property="Visibility" Value="Visible"/>
                    </MultiTrigger>
                </ControlTemplate.Triggers>
          </ControlTemplate>
      </Setter.Value>
   </Setter>
</Style>

我的XAML DataGrid是

<DataGrid Name="PassengerGrid" AutoGenerateColumns="False"  ColumnHeaderStyle="{StaticResource FilterDataGridColumnHeader}">
     <DataGridTextColumn Binding="{Binding CustomVisitTime}"  Header="Visit Time" CanUserSort="true" Width="90" ElementStyle="{StaticResource DataGridElementStyle}""/>
     <DataGridTextColumn Binding="{Binding PassengerName}"  Header="Passenger Name" CanUserSort="true" Width="90" ElementStyle="{StaticResource DataGridElementStyle}""/>
</DataGrid>

我需要更新的属性是

private bool _hasFilterIcon = false;
public bool HasFilterIcon
{
    get { return _hasFilterIcon; }
    set
    {
        _hasFilterIcon = value;
        OnPropertyChanged();
    }
}

如果任何列标题按钮获得Visibility Visible，那么我需要将HasFilterIcon的值更改为true，否则false。请帮助我。

注意：Style有N个按钮，在N中我必须检查任何一个按钮都是Visible ......

Answer 1

使用BooleanToVisibilityConverter命名空间中的System.Window.Control。只需将其解析如下，并在绑定中使用（在页面/窗口资源中）。

<BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter" />

绑定如下:(模式OneWayToSource反映属性）

Visibility="{Binding RelativeSource={RelativeSource AncestorType={x:Type DataGrid}},Path=HasFilterIcon,Converter={StaticResource BooleanToVisibilityConverter},Mode=OneWayToSource}"

<强>更新

因为在XAML / WPF中没有干净的方法来执行此操作（只有干净的方法是创建单独的用于分隔按钮可见性的属性

试一试

1.像这样创建你的财产：

private AllButtonVisibility visible = new AllButtonVisibility();

    public AllButtonVisibility Visible
    {
        get { return visible; }
        set 
        { 
            visible = value;
            RaiseChange("Visible");
        }
    }

    public class AllButtonVisibility
    {
        public bool AllButtonVisible { get; set; }
    }

<强> 2。示例XAML：

 <Window.Resources>
    <local:MyMultivalueConverter x:Key="MyMultivalueConverter" />
</Window.Resources>

<ContentControl Width="0">
        <ContentControl.Content>
            <MultiBinding Converter="{StaticResource MyMultivalueConverter}">
            <Binding ElementName="dataGrid" />
            <Binding Path="Visible"  />
             <Binding ElementName="dataGrid" Path="ActualHeight" />
            </MultiBinding>
        </ContentControl.Content>
    </ContentControl>
</StackPanel>

第3。转换器：

public class MyMultivalueConverter : IMultiValueConverter { public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture) { List<DataGridColumnHeader> columnHeaders = GetVisualChildCollection<DataGridColumnHeader>(values[0] as DependencyObject); var AllButtonVisibility = values[1] as AllButtonVisibility; foreach (DataGridColumnHeader dataGridColumnHeader in columnHeaders) { AllButtonVisibility.AllButtonVisible = dataGridColumnHeader.Visibility == Visibility.Visible; if (AllButtonVisibility.AllButtonVisible) return Binding.DoNothing; } return Binding.DoNothing; } public List<T> GetVisualChildCollection<T>(object parent) where T : Visual { List<T> visualCollection = new List<T>(); GetVisualChildCollection(parent as DependencyObject, visualCollection); return visualCollection; } private void GetVisualChildCollection<T>(DependencyObject parent, List<T> visualCollection) where T : Visual { int count = VisualTreeHelper.GetChildrenCount(parent); for (int i = 0; i < count; i++) { DependencyObject child = VisualTreeHelper.GetChild(parent, i); if (child is T) { visualCollection.Add(child as T); } else if (child != null) { GetVisualChildCollection(child, visualCollection); } } } public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture) { throw new NotImplementedException(); } }

原因如果不是PROGRAMMERS，那我们是什么。：）

如何根据DataGridColumnHeader样式中的Button Visibility更新bool属性

1 个答案: