带有文本框的 WPF 弹出窗口？
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WPF popup with textbox?
提问by theOne
I am trying to create a control that displays search results as a user types something in a textbox. For this, I have a textbox and a popup that shows up when the user types something into it (just like a google search box). Like so,
我正在尝试创建一个控件，该控件在用户在文本框中键入内容时显示搜索结果。为此，我有一个文本框和一个弹出窗口，当用户在其中输入内容时会显示该弹出窗口（就像 Google 搜索框一样）。像这样，
<Grid> <TextBox Name="userEntry" /> <Popup /> </Grid>
Now when the user starts typing into the textbox i want the popup to show and stay open until the user focusses on some other ui control or if the text entered is empty. I am unable to achieve this easily and was wondering if there are alternate better ways of doing this in wpf. Regards
现在，当用户开始在文本框中输入时，我希望弹出窗口显示并保持打开状态，直到用户专注于其他 ui 控件或输入的文本为空。我无法轻松实现这一点，并且想知道在 wpf 中是否有其他更好的方法可以做到这一点。问候
回答by eran otzap
XAML :
XAML：
<Window>
<Grid>
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition />
</Grid.RowDefinitions>
<Button x:Name="btn" Content="Open Search Window" Height="30" Width="150" Click="btn_Click"/>
<Popup x:Name="popup" PlacementTarget="{Binding ElementName=btn}" Placement="Bottom" Width="200" Height="100" Margin="0,20,0,0">
<Border BorderBrush="Black" BorderThickness="2" Background="AliceBlue">
<TextBox x:Name="txtBox" VerticalAlignment="Center" Margin="15,0,15,0"/>
</Border>
</Popup>
<TextBox x:Name="focusTarger" Text="Focus Me !" Grid.Row="1" HorizontalAlignment="Center" VerticalAlignment="Center" Width="200" TextAlignment="Center" FontSize="16"/>
</Grid>
</Window>
CS :
CS ：
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
GotFocus += MainWindow_GotFocus;
}
void MainWindow_GotFocus(object sender, RoutedEventArgs e)
{
FrameworkElement element = (FrameworkElement)e.OriginalSource;
if (txtBox == element || popup == element || element.Parent == popup)
return;
popup.IsOpen = !string.IsNullOrEmpty(txtBox.Text);
}
private void btn_Click(object sender, RoutedEventArgs e)
{
popup.IsOpen = true;
}
}
