c# - 绑定(bind)到 Caps Lock

Question

我正在 WPF 中构建登录屏幕。我正在尝试弄清楚如何将我的部分代码绑定(bind)为仅在大写锁定键打开时可见。

<StackPanel Grid.Row="3" Grid.ColumnSpan="2" Grid.Column="1" Orientation="Horizontal">
        <Image Source="../../../Resources/Icons/109_AllAnnotations_Warning_16x16_72.png" Height="16" Width="16"/>
        <Label>Caps lock is on</Label>
</StackPanel>

我更喜欢仅使用 xaml 绑定(bind)的解决方案。

Answer 1

我们在登录表单中使用以下方法在密码框获得焦点时显示“大写锁定警告”。

    private void PasswordBox_PreviewKeyDown(object sender, KeyEventArgs e)
    {
        UpdateCapsLockWarning(e.KeyboardDevice);
    }

    private void PasswordBox_GotKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
    {
        UpdateCapsLockWarning(e.KeyboardDevice);
    }

    private void PasswordBox_LostKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
    {
        CapsLockWarning.Visibility = Visibility.Hidden;
    }

    private void UpdateCapsLockWarning(KeyboardDevice keyboard)
    {
        CapsLockWarning.Visibility = keyboard.IsKeyToggled(Key.CapsLock) ? Visibility.Visible : Visibility.Hidden;
    }

虽然这不是您正在寻找的仅限绑定(bind)的答案。