当其内部 ComboBox 获得焦点时选择一个 ListBoxItem [英] Selecting a ListBoxItem when its inner ComboBox is focused

问题描述

我有一个 DataTemplate，它将是一个模板化的 ListBoxItem，这个 DataTemplate 有一个ComboBox 在其中，当它有焦点时，我想要这个模板的 ListBoxItem代表被选中，这对我来说是正确的.但遗憾的是它不起作用 =(

I have a DataTemplate that will be a templated ListBoxItem, this DataTemplate has a ComboBox in it which when it has focus I want the ListBoxItem that this template represents to become selected, this looks right to me. but sadly enough it doesn't work =(

所以这里真正的问题是在 DataTemplate 中是否可以获取或设置值ListBoxItem.IsSelected 属性通过 DataTemplate.Trigger?

So the real question here is within a DataTemplate is it possible to get or set the value of the ListBoxItem.IsSelected property via a DataTemplate.Trigger?

<DataTemplate x:Key="myDataTemplate" 
              DataType="{x:Type local:myTemplateItem}">

 <Grid x:Name="_LayoutRoot">
     <ComboBox x:Name="testComboBox" />
 </Grid>

 <DataTemplate.Triggers>
     <Trigger Property="IsFocused" value="true" SourceName="testComboBox">
         <Setter Property="ListBoxItem.IsSelected" Value="true" />
     </Trigger>
 </DataTemplate.Triggers>

</DataTemplate>

<ListBox ItemTemplate="{StaticResource myDataTemplate}" />

推荐答案

我找到了解决您问题的方法.

I found a solution for your problem.

问题是，当您在列表框项上有一个控件时，单击该控件(例如输入文本或更改组合框的值)时，列表框项不会被选中.

The problem is that when you have a control on your listboxitem, and the control is clicked (like for inputting text or changing the value of a combobox), the ListBoxItem does not get selected.

这应该可以完成工作:

public class FocusableListBox : ListBox
{
    protected override bool IsItemItsOwnContainerOverride(object item)
    {
        return (item is FocusableListBoxItem);
    }

    protected override System.Windows.DependencyObject GetContainerForItemOverride()
    {
        return new FocusableListBoxItem();
    }
}

--> 使用这个 FocusableListBox 代替 WPF 的默认 ListBox.

--> Use this FocusableListBox in stead of the default ListBox of WPF.

并使用这个 ListBoxItem:

And use this ListBoxItem:

public class FocusableListBoxItem : ListBoxItem
{
    public FocusableListBoxItem()
    {
        GotFocus += new RoutedEventHandler(FocusableListBoxItem_GotFocus);
    }


    void FocusableListBoxItem_GotFocus(object sender, RoutedEventArgs e)
    {
        object obj = ParentListBox.ItemContainerGenerator.ItemFromContainer(this);
        ParentListBox.SelectedItem = obj;
    }

    private ListBox ParentListBox
    {
        get
        {
            return (ItemsControl.ItemsControlFromItemContainer(this) as ListBox);
        }
    }

}

A Treeview 也有这个问题，但是这个解决方案不适用于 Treeview，因为 Treeview 的 SelectedItem 是 只读.因此，如果您可以帮助我解决 Treeview 问题，请 ;-)

A Treeview does also have this problem, but this solution does not work for a Treeview, 'cause SelectedItem of Treeview is readonly. So if you can help me out with the Treeview please ;-)

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