我有一个带有ListBox和Button的WPF Popup控件。当我点击Button
时,它应该被禁用。问题是,当我禁用Button时,Tab键从Popup中退出。在我将Button的IsEnabled
设置为false之后,我尝试将焦点设置为ListBox,但这不起作用。那么,如何将选项卡焦点设置为Popup控件中的ListBox?
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);
}
}
}
这是截图:
alt text http://img11.imageshack.us/img11/6305/popuptabkey.png
稍后编辑:
我找到了一种解决方法,即延迟FocusListBox();
来电,如下所示:
Dispatcher.BeginInvoke(new Action(FocusListBox), DispatcherPriority.Input);
答案 0 :(得分:2)
您需要通过在弹出窗口中设置FocusManager.IsFocusScope property来定义显式焦点范围:
<Popup FocusManager.IsFocusScope="true">
<!-- your content here -->
</Popup>
这将使焦点不再回到包含元素内的控件。