我已經搜索了高和低,但我無法弄清楚這一個。我正在構建一個可編輯項目的ListBox
。我有一個DataTemplate
爲ListBox.ItemTemplate
其中包含(其中包括)TextBlock
和TextBox
。 TextBlock
始終可見,並且TextBox
僅在用戶雙擊TextBlock
後纔可見。當用戶點擊列表中的另一個項目時,TextBox
再次隱藏以顯示TextBlock
。所有這些都很好。見我的代碼:在DataTemplate中顯示和對焦TextBox
XAML
<Window.Resources>
<local:GoalCollection x:Key="goals"/>
<DataTemplate x:Key="GoalItemTemplate" DataType="local:Goal">
<Grid>
<TextBlock Text="{Binding Title}"
MouseLeftButtonDown="TextBlock_MouseLeftButtonDown"
VerticalAlignment="Center"/>
<TextBox Name="EntryBox"
Text="{Binding Title}"
Visibility="Hidden"
BorderBrush="{x:Null}"
Padding="-2,0,0,0"
Panel.ZIndex="1"
Margin="-2,0,0,0"/>
</Grid>
</DataTemplate>
</Window.Resources>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition Width="2*" />
</Grid.ColumnDefinitions>
<ListBox Name="GoalsList"
ItemsSource="{Binding Source={StaticResource goals}}"
HorizontalContentAlignment="Stretch"
ItemTemplate="{StaticResource GoalItemTemplate}"
SelectionChanged="GoalsList_SelectionChanged" />
</Grid>
C#
public partial class MainWindow : Window
{
GoalCollection goals;
public MainWindow()
{
InitializeComponent();
}
private childItem FindVisualChild<childItem>(DependencyObject obj)
where childItem : DependencyObject { ... }
protected override void OnInitialized(EventArgs e)
{
base.OnInitialized(e);
goals = (GoalCollection)Resources["goals"];
}
private void TextBlock_MouseLeftButtonDown(object sender,
MouseButtonEventArgs e)
{
if (e.ClickCount == 2)
{
TextBlock tblk = sender as TextBlock;
if (tblk == null)
return;
TextBox tbx = ((Grid)tblk.Parent).FindName("EntryBox") as TextBox;
if (tbx == null)
return;
tbx.Visibility = Visibility.Visible;
Keyboard.Focus(tbx);
}
}
private void GoalsList_SelectionChanged(object sender,
SelectionChangedEventArgs e)
{
ListBoxItem lbi;
ContentPresenter cp;
DataTemplate dt;
TextBox tbx;
foreach (Goal item in e.RemovedItems)
{
lbi = (ListBoxItem)GoalsList.ItemContainerGenerator.
ContainerFromItem(item);
cp = FindVisualChild<ContentPresenter>(lbi);
dt = cp.ContentTemplate;
tbx = (TextBox)dt.FindName("EntryBox", cp);
if (tbx == null)
continue;
tbx.Visibility = Visibility.Hidden;
}
}
}
說我有是,TextBox
立即將焦點轉移回主機ListBoxItem
雙擊後的問題。需要額外的(第三次)點擊以專注於TextBox。
通過這個追蹤,我發現TextBox
確實獲得焦點。但是它會立即丟失它(嘗試爲TextBox.LostKeyboardFocus
事件添加一個處理程序,並逐步從TextBlock_MouseLeftButtonDown()方法中跳過)。有任何想法嗎?
謝謝。
你,先生,是一個天才!我一直在忘記這一點。 – gregsdennis