Question

我有3个文本框。我怎么知道他们中哪一个有焦点？

 if (TextBoxExtendedSearchName.Focus() == false && 
     TextBoxExtendedSearchNomenclature.Focus() == false 
      && TextBoxExtendedSearchSpecialist.Focus() == false)
      {
                window.Close();
      }

这不起作用

我使用WPF

private void TextBox1_LostFocus(object sender, RoutedEventArgs e)
        {
            if (!TextBox1.IsFocused && !TextBox2.IsFocused)
                MessageBox.Show("Not Focus");
        }

        private void TextBox2_LostFocus(object sender, RoutedEventArgs e)
        {
            if (!TextBox1.IsFocused && !TextBox2.IsFocused)
                MessageBox.Show("Not Focus");
        }

此示例不起作用

我想我明白了问题所在。当我在“迷失焦点”事件中这样做时，它不起作用。

 public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void TextBox1_LostFocus(object sender, RoutedEventArgs e)
        {
            if (!TextBox1.IsFocused && !TextBox2.IsFocused)
                MessageBox.Show("Not Focus");
            else
                MessageBox.Show("Yes Focus");
        }

        private void TextBox2_LostFocus(object sender, RoutedEventArgs e)
        {
            if (!TextBox1.IsFocused && !TextBox2.IsFocused)
                MessageBox.Show("Not Focus");
            else
                MessageBox.Show("Yes Focus");
        }

XAML

<Window x:Class="TrainWPF.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <TextBox x:Name="TextBox1" HorizontalAlignment="Left" Height="25" Margin="62,61,0,0" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="205" LostFocus="TextBox1_LostFocus"/>
        <TextBox x:Name="TextBox2" HorizontalAlignment="Left" Height="23" Margin="62,145,0,0" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="205" LostFocus="TextBox2_LostFocus"/>
        <Button Content="Button" HorizontalAlignment="Left" Margin="267,249,0,0" VerticalAlignment="Top" Width="96" RenderTransformOrigin="0.5,0.5" Height="37">
            <Button.RenderTransform>
                <TransformGroup>
                    <ScaleTransform/>
                    <SkewTransform/>
                    <RotateTransform Angle="0.397"/>
                    <TranslateTransform/>
                </TransformGroup>
            </Button.RenderTransform>
        </Button>

    </Grid>
</Window>

这不起作用

我理解这是我的逻辑错误

Answer 1

试试这个：

//Logical focus
 var focusedControl = FocusManager.GetFocusedElement(this);

//KeyBoard focus
 var focusedControl =  Keyboard.FocusedElement;

// dummy logic to close the window when all the three textboxes are not focused.
List<TextBox> items=new List<TextBox>();
items.Add(TextBoxExtendedSearchName);
items.Add(TextBoxExtendedSearchNomenclature);
items.Add(TextBoxExtendedSearchSpecialist);
if(!items.Any(o=>o==focusedControl))
 {
    window.Close();
 }

Answer 2

您使用的功能错误。您需要使用IsFocused属性来获取Control有焦点。

请参阅此处的文档：Link

使用您的代码：

 if (!TextBoxExtendedSearchName.IsFocused
     && !TextBoxExtendedSearchNomenclature.IsFocused
     && !TextBoxExtendedSearchSpecialist.IsFocused)
     {
        window.Close();
     }

如果窗口中没有Close，则会Focus。

检查是否关注元素

2 个答案: