[英]How to bind property of dynamically created components of a user control to another component?
我有一個用戶控件,它根據列表創建一組單選按鈕。 單選按鈕是使用數據模板創建的。
<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>
我在需要根據選定的單選按鈕更改組件(堆棧面板)的可見性的窗口中使用它。
<uc:CommonRadioButtonGroup x:Name="SelectionButtonsGroup" ></uc:CommonRadioButtonGroup>
我正在嘗試使用樣式觸發器更改可見性。
<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>
我想不出一種方法來實現這個視圖模型。 我試過這個:
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”是單選按鈕的選項。 但它根本不起作用。
最終,在使用單選按鈕選擇模式時,必須修改堆棧面板的可見性。 請評論代碼的正確性。
編輯:這是在代碼隱藏中添加的用戶控件的 ItemSource:
SelectionButtonsGroup.RadioGroup.ItemsSource = EngineModes.Modes;
this.DataContext = EngineModes.PresentMode;
我將樣式更新為
<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>
並為靜態屬性更改添加了一個單獨的通知事件:
public static event EventHandler<PropertyChangedEventArgs> StaticPropertyChanged
= delegate { };
public static void NotifyStaticPropertyChanged(string propertyName)
{
StaticPropertyChanged(null, new PropertyChangedEventArgs(propertyName));
}
並在引擎模式更新的地方調用它。
EngineModes.NotifyStaticPropertyChanged("PresentMode");
瞧! 有效。
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