在 WPF 中丢失焦点事件时更改列表框模板 [英] Change listbox template on lost focus event in WPF

问题描述

我想显示一个带有 TextBlocks 作为项目的列表框.当用户单击/选择一个项目时，它会更改为用于编辑的 TextBox.一旦控件失去焦点，项目就会变回 TextBlock.

以下 XAML 几乎可以正常工作，因为 TextBlock 在被选中时确实会变成一个 TextBox.如果我选择列表中的另一个项目，它也会变回 TextBlock.问题是，如果我移出列表框(在本例中为添加新文本框)，列表项将保持为文本框.

问题( WPF ListViewItem 失去焦点活动 - 如何参加活动? )看起来很有希望，但我无法让它发挥作用.我尝试使用 IsFocused 属性，但后来我无法编辑文本框，因为当我进入文本框时，listboxitem 会失去焦点，从而在我有机会编辑文本之前返回到 TextBlock.

如果列表框/项目失去焦点，如何让 TextBox 转回 TextBlock?

(也欢迎任何其他实现目标的实现)

<窗口.资源><DataTemplate x:Key="ItemTemplate"><TextBlock Text="{绑定名称}"/></数据模板><DataTemplate x:Key="SelectedTemplate"><TextBox Text="{Binding Name, Mode=TwoWay}"/></数据模板><Style TargetType="{x:Type ListBoxItem}" x:Key="ContainerStyle"><Setter Property="ContentTemplate" Value="{StaticResource ItemTemplate}"/><Style.Triggers><Trigger Property="IsSelected" Value="True"><Setter Property="ContentTemplate" Value="{StaticResource SelectedTemplate}"/></触发器></Style.Triggers></风格></Window.Resources><堆栈面板><ListBox ItemsSource="{绑定部门}" Horizo​​ntalContentAlignment="Stretch"ItemContainerStyle="{StaticResource ContainerStyle}"/><网格><Grid.ColumnDefinitions><ColumnDefinition Width="*"/><ColumnDefinition Width="Auto"/></Grid.ColumnDefinitions><TextBox Text="{Binding NewDepartmentName, Mode=TwoWay}"/><Button Grid.Column="1" Width="50" Content="Add" Command="{Binding Path=AddNewDepartmentCommand}"/></网格></StackPanel></窗口>

解决方案

这不能回答您的问题，而是通过在未选择 listboxitem 时使文本框看起来像文本块来提供替代解决方案:

<资源字典><Style x:Key="ListBoxSelectableTextBox" TargetType="{x:Type TextBox}"><Setter Property="IsHitTestVisible" Value="False"/><Style.Triggers><DataTrigger Binding="{Binding IsSelected, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ListBoxItem}, AncestorLevel=1}}" Value="True"><Setter Property="IsHitTestVisible" Value="True"/></数据触发器></Style.Triggers></风格></ResourceDictionary></Page.Resources><网格><ListBox ItemsSource="{绑定部门}" Horizo​​ntalContentAlignment="Stretch"><ListBox.ItemTemplate><数据模板><TextBox Margin="5" Style="{StaticResource ListBoxSelectableTextBox}" Text="{Binding Name}" BorderBrush="{x:Null}"/></数据模板></ListBox.ItemTemplate></列表框></网格>

I want to present a listbox with TextBlocks as items. When the user clicks/selects an item it changes into a TextBox for editing. As soon as the controls loses focus the item would turn back to a TextBlock.

The following XAML is almost working in that the TextBlock does turn into a TextBox when it's selected. It also turns back to a TextBlock if I select another item on the list. The problem is that if I move out of the listbox (in this case to the Add New text box) the list item stays as a TextBox.

The question ( WPF ListViewItem lost focus event - How to get at the event? ) looked promising but I can't make it work. I tried using the IsFocused property but then I wasn't able to edit the textbox because when I got into the textbox the listboxitem would go out of focus and thus turning back to a TextBlock before I had a chance to edit the text.

How can I make the TextBox turn back to TextBlock if the listbox/item loses the focus?

(Any other implementation that accomplishes the goal are also welcomed)

<Window x:Class="MyView.MainWindow1"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
        Title="MainWindow1" Height="300" Width="200">
    <Window.Resources>
        <DataTemplate x:Key="ItemTemplate">
            <TextBlock Text="{Binding Name}" />
        </DataTemplate>

        <DataTemplate x:Key="SelectedTemplate">
            <TextBox Text="{Binding Name, Mode=TwoWay}" />
        </DataTemplate>

        <Style TargetType="{x:Type ListBoxItem}" x:Key="ContainerStyle">
            <Setter Property="ContentTemplate" Value="{StaticResource ItemTemplate}" />
            <Style.Triggers>
                <Trigger Property="IsSelected" Value="True">
                    <Setter Property="ContentTemplate" Value="{StaticResource SelectedTemplate}" />
                </Trigger>
            </Style.Triggers>
        </Style>
    </Window.Resources>

    <StackPanel >
        <ListBox ItemsSource="{Binding Departments}" HorizontalContentAlignment="Stretch"
                 ItemContainerStyle="{StaticResource ContainerStyle}" />
        <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*" />
                <ColumnDefinition Width="Auto" />
            </Grid.ColumnDefinitions>
            <TextBox  Text="{Binding NewDepartmentName, Mode=TwoWay}"  />
            <Button Grid.Column="1" Width="50" Content="Add" Command="{Binding Path=AddNewDepartmentCommand}" />
        </Grid>
    </StackPanel>
</Window>

解决方案

This doesn't answer your question, but gives an alternative solution by making a textbox look like a textblock when the listboxitem isn't selected:

<Page.Resources>
    <ResourceDictionary>
        <Style x:Key="ListBoxSelectableTextBox" TargetType="{x:Type TextBox}">
            <Setter Property="IsHitTestVisible" Value="False" />
            <Style.Triggers>
                <DataTrigger Binding="{Binding IsSelected, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ListBoxItem}, AncestorLevel=1}}" Value="True">
                    <Setter Property="IsHitTestVisible" Value="True" />
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </ResourceDictionary>
</Page.Resources>
<Grid>
    <ListBox ItemsSource="{Binding Departments}" HorizontalContentAlignment="Stretch">
        <ListBox.ItemTemplate>
            <DataTemplate>
                <TextBox Margin="5" Style="{StaticResource ListBoxSelectableTextBox}" Text="{Binding Name}" BorderBrush="{x:Null}"/>
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>
</Grid>

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