c# - 在 GridView 中引用单元格中的文本框

Question

所以我制作了一个 ListView，在其 View 属性中包含 GridView:

<ListView Grid.Row="1" Name="TicketListView" Margin="20,5,20,5">
        <ListView.View>
            <GridView>
                <GridViewColumn Header="Owned" DisplayMemberBinding="{Binding Owned}"/>
                <GridViewColumn Header="Name" DisplayMemberBinding="{Binding Name}"/>
                <GridViewColumn Header="Price" DisplayMemberBinding="{Binding Price, ConverterCulture='en-US', StringFormat={}{0:C2}}"/>
                <GridViewColumn Header="Amount">
                    <GridViewColumn.CellTemplate>
                        <DataTemplate>
                            <TextBox MinWidth="20" TextAlignment="Center" Margin="5" Text="{Binding Bought, Mode=TwoWay, UpdateSourceTrigger=LostFocus}" />
                        </DataTemplate>
                    </GridViewColumn.CellTemplate>
                </GridViewColumn>
            </GridView>
        </ListView.View>                
        ...
</ListView>

在此 ListView 中选择项目时，我想专注于特定的 TextBox，因此您不必单击 TextBox 进行编写，而是可以单击项目(行)并开始更改其值。 (希望你明白 ;( )

这是可能的还是我应该用另一种方式来做这个列表？

Answer 1

您可以处理 ListViewItem 的 PreviewMouseLeftButtonDown 事件，并使用 VisualTreeHelper 获取对 TextBox 的引用类:

<ListView Grid.Row="1" Name="TicketListView">
    <ListView.ItemContainerStyle>
        <Style TargetType="ListBoxItem">
            <EventSetter Event="PreviewMouseLeftButtonDown" Handler="TicketListView_PreviewMouseLeftButtonDown" />
        </Style>
    </ListView.ItemContainerStyle>
    <ListView.View>
        <GridView>
            <GridViewColumn Header="Owned" DisplayMemberBinding="{Binding Owned}"/>
            <GridViewColumn Header="Name" DisplayMemberBinding="{Binding Name}"/>
            <GridViewColumn Header="Price" DisplayMemberBinding="{Binding Price, ConverterCulture='en-US', StringFormat={}{0:C2}}"/>
            <GridViewColumn Header="Amount">
                <GridViewColumn.CellTemplate>
                    <DataTemplate>
                        <TextBox MinWidth="20" TextAlignment="Center" Margin="5" Text="{Binding Bought, Mode=TwoWay, UpdateSourceTrigger=LostFocus}" />
                    </DataTemplate>
                </GridViewColumn.CellTemplate>
            </GridViewColumn>
        </GridView>
    </ListView.View>
</ListView>

---

private void TicketListView_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    ListViewItem lvi = sender as ListViewItem;
    TextBox textBox = GetChildOfType<TextBox>(lvi);
    if (textBox != null)
    {
        textBox.Dispatcher.BeginInvoke(new Action(() =>
        {
            bool b = textBox.Focus();
            Keyboard.Focus(textBox);
        }));
    }
}

private static T GetChildOfType<T>(DependencyObject depObj) where T : DependencyObject
{
    if (depObj == null)
        return null;

    for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
    {
        var child = VisualTreeHelper.GetChild(depObj, i);
        var result = (child as T) ?? GetChildOfType<T>(child);
        if (result != null) return result;
    }
    return null;
}