WPF 使用 MVVM 禁用列表框项目
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WPF Disable listbox items with MVVM
提问by user1886304
I tried searching through a lot of threads and I've found several that's pretty close but not exactly what I want. After a day of searching, I just decided to ask. Apologies if I missed something, I feel like this would be common enough but I can't seem to quite get it.
我尝试搜索了很多线程，我发现了几个非常接近但不完全是我想要的。经过一天的搜索，我决定问一下。抱歉，如果我错过了什么，我觉得这很常见，但我似乎不太明白。
I have UserControl that bounded to a ViewModel, and it has a Listbox with ItemsSource=ObservableCollection which is a property of the ViewModel like below:
我有一个绑定到 ViewModel 的 UserControl，它有一个 Listbox，其中 ItemsSource=ObservableCollection 是 ViewModel 的一个属性，如下所示：
Whenever I select an item, I call SomeObject.IsEnabled = false on several other items depending on certain conditions. I'd like to bind the listbox items to that IsEnabled property so I can grayout whichever items whenever I do a selection.
每当我选择一个项目时，我都会根据某些条件在其他几个项目上调用 SomeObject.IsEnabled = false 。我想将列表框项目绑定到该 IsEnabled 属性，这样我就可以在进行选择时将任何项目灰显。
ViewModel:
视图模型：
Class ViewModel : PropertyNotificationObject
{
private ObservableCollection<SomeObject> m_list;
public ObservableCollection<SomeObject> List {get; set;} //notifying properly
private void selectedItem()
{
//several in SomeObjects in List sets IsEnabled = false
}
}
The Object Class
项目等级
class SomeObject : PropertyNotificationObject
{
private bool m_isEnabled;
public IsEnabled { get; set; } //notifying properly
}
XAML
XAML
<DataTemplate x:Key="ListTemplate">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<TextBlock Text="{Binding ., Converter={someConverterObjectToString}}"/>
</Grid>
</DataTemplate>
<ListBox ItemsSource="{Binding List}" ItemTemplate="{StaticResource ListTemplate}"/>
I've tried using StyleTriggers in the ListBox.ItemContainerStyle and the DataTemplate like below but I couldn't figure out how to get to the SomeOject.IsEnabled property.
我已经尝试在 ListBox.ItemContainerStyle 和 DataTemplate 中使用 StyleTriggers，如下所示，但我不知道如何获得 SomeOject.IsEnabled 属性。
<ListBox.ItemContainerStyle>
<Style TargetType="{x:Type ListBoxItem}">
<Style.Triggers>
<DataTrigger Binding={???????? I can't get to my SomeObject properties.}
</Style.Triggers>
</Style>
</ListBox.ItemContainerStyle>
Sorry for the lack of colors, I'm new here and don't really know how use the editor very well.
抱歉缺少颜色，我是新来的，不太了解如何很好地使用编辑器。
Thanks in advance.
提前致谢。
回答by Federico Berasategui
{Binding IsEnabled}in your ItemContainerStyleshould do the work. Look at VS debug window for binding errors
{Binding IsEnabled}在你ItemContainerStyle应该做的工作。查看 VS 调试窗口是否存在绑定错误
Editor directly bind the IsEnabled property of the ListBoxItem:
编辑或直接绑定 ListBoxItem 的 IsEnabled 属性：
<Style TargetType="{x:Type ListBoxItem}">
<Setter Property="IsEnabled" Value="{Binding IsEnabled}"/>
</Style>
