我有一个 WPF Popup 控件,其中包含一个 ListBox 和一个 Button。当我单击 时Button
,它应该被禁用。问题是,当我禁用按钮时,Tab 键会从弹出窗口中消失。在将 Button 设置为 false 之后,我尝试将焦点设置到 ListBox,IsEnabled
但这不起作用。那么,如何将选项卡焦点设置为 Popup 控件内的 ListBox 呢?
这是我的代码。
Window1.xaml:
<Window x:Class="WpfApplication5.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Height="300" Width="300">
<StackPanel>
<Button Name="openButton" Content="Open"/>
<Popup Name="popup" Placement="Center">
<StackPanel>
<ListBox Name="listBox"/>
<Button Name="newItemsButton" Content="New Items"/>
</StackPanel>
</Popup>
</StackPanel>
</Window>
Window1.xaml.cs:
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
namespace WpfApplication5
{
partial class Window1 : Window
{
public Window1()
{
InitializeComponent();
openButton.Focus();
listBox.ItemsSource = new string[] { "Item1", "Item2", "Item3" };
listBox.SelectedIndex = 1;
openButton.Click += delegate { popup.IsOpen = true; };
popup.Opened += delegate { FocusListBox(); };
newItemsButton.Click += delegate
{
newItemsButton.IsEnabled = false;
FocusListBox();
};
}
void FocusListBox()
{
var i = listBox.ItemContainerGenerator.ContainerFromIndex(
listBox.SelectedIndex) as ListBoxItem;
if (i != null)
Keyboard.Focus(i);
}
}
}
这是一个屏幕截图:
替代文字 http://img11.imageshack.us/img11/6305/popuptabkey.png
后期编辑:
我找到了一种解决方法,即延迟FocusListBox();
通话,如下所示:
Dispatcher.BeginInvoke(new Action(FocusListBox), DispatcherPriority.Input);