[英]How to bind property of dynamically created components of a user control to another component?
我有一个用户控件,它根据列表创建一组单选按钮。 单选按钮是使用数据模板创建的。
<UserControl.Resources>
<SelectableItem:SelectableItem x:Key="vm"></SelectableItem:SelectableItem>
<src:RadioButtonCheckedConverter x:Key="RadioButtonCheckedConverter" />
<CollectionViewSource
Source="{Binding Source={x:Static Application.Current}, Path=ItemDescription}"
x:Key="ListingDataView" />
<DataTemplate x:Key="GroupingHeaderTemplate">
<TextBlock Text="{Binding Path=Name}" Style="{StaticResource GroupHeaderStyle}"/>
</DataTemplate>
</UserControl.Resources>
<Grid>
<ItemsControl Name="RadioGroup" AutomationProperties.Name="RadioGroup" >
<ItemsControl.ItemTemplate>
<DataTemplate>
<RadioButton
GroupName="{Binding Path=ItemType}"
Content="{Binding Path=ItemDescription}"
FlowDirection="RightToLeft"
IsChecked="{Binding Path=IsSelected, Mode=TwoWay}" Style="{DynamicResource CustomRadioButton}" Margin="20,0" Checked="RadioButton_Checked" Tag="{Binding Path=ItemDescription, Mode=TwoWay}"/>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
</Grid>
</UserControl>
我在需要根据选定的单选按钮更改组件(堆栈面板)的可见性的窗口中使用它。
<uc:CommonRadioButtonGroup x:Name="SelectionButtonsGroup" ></uc:CommonRadioButtonGroup>
我正在尝试使用样式触发器更改可见性。
<Style x:Key="spStyle" TargetType="StackPanel" >
<Style.Triggers>
<DataTrigger Binding="{Binding Source={x:Static Local:EngineModes.PresentMode}}" Value="Stop">
<Setter Property="StackPanel.Visibility" Value="Hidden" />
</DataTrigger>
<DataTrigger Binding="{Binding Source={x:Static Local:EngineModes.PresentMode}}" Value="Wait">
<Setter Property="StackPanel.Visibility" Value="Visible" />
</DataTrigger>
<DataTrigger Binding="{Binding Source={x:Static Local:EngineModes.PresentMode}}" Value="Go">
<Setter Property="StackPanel.Visibility" Value="Visible" />
</DataTrigger>
</Style.Triggers>
</Style>
我想不出一种方法来实现这个视图模型。 我试过这个:
public class EngineModes : INotifyPropertyChanged
{
public static List<SelectableItem> Modes { get; set; } = new List<SelectableItem>();
public static string PresentMode { get; set; }
public event PropertyChangedEventHandler PropertyChanged;
public virtual void OnPropertyChanged(string propertyInfo)
{
App.Current.Dispatcher.BeginInvoke((Action)(() =>
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyInfo));
}
));
}
}
其中“模式”是单选按钮的选项。 但它根本不起作用。
最终,在使用单选按钮选择模式时,必须修改堆栈面板的可见性。 请评论代码的正确性。
编辑:这是在代码隐藏中添加的用户控件的 ItemSource:
SelectionButtonsGroup.RadioGroup.ItemsSource = EngineModes.Modes;
this.DataContext = EngineModes.PresentMode;
我将样式更新为
<Style x:Key="sprecStyle" TargetType="StackPanel">
<Style.Triggers>
<DataTrigger Binding="{Binding Source={StaticResource engineModes}, Path=PresentMode, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Value="Stop">
<Setter Property="StackPanel.Visibility" Value="Collapsed" />
</DataTrigger>
<DataTrigger Binding="{Binding Source={StaticResource engineModes}, Path=PresentMode, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Value="Wait">
<Setter Property="StackPanel.Visibility" Value="Visible" />
</DataTrigger>
<DataTrigger Binding="{Binding Source={StaticResource engineModes}, Path=PresentMode, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Value="Go">
<Setter Property="StackPanel.Visibility" Value="Collapsed" />
</DataTrigger>
</Style.Triggers>
</Style>
并为静态属性更改添加了一个单独的通知事件:
public static event EventHandler<PropertyChangedEventArgs> StaticPropertyChanged
= delegate { };
public static void NotifyStaticPropertyChanged(string propertyName)
{
StaticPropertyChanged(null, new PropertyChangedEventArgs(propertyName));
}
并在引擎模式更新的地方调用它。
EngineModes.NotifyStaticPropertyChanged("PresentMode");
瞧! 有效。
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