Windows-Gotify-Client/CopyFallbackWindow.xaml.cs

using System.Windows;
using System.Windows.Input;
using System.Windows.Threading;

// 双开 WPF + WinForms 时,这几个类型两个命名空间都有,固定走 WPF 的。
using Clipboard = System.Windows.Clipboard;
using KeyEventArgs = System.Windows.Input.KeyEventArgs;
using Key = System.Windows.Input.Key;

namespace WindowsGotify;

/// <summary>
/// 剪贴板被其他程序长期占用(典型是网易UU远程 / RDP / 杀软)时的兜底:
/// 把要复制的文本放在一个可编辑/可选中的 TextBox 里,自动全选,让用户自己 Ctrl+C。
/// </summary>
public partial class CopyFallbackWindow : Window
{
    public CopyFallbackWindow(string text)
    {
        InitializeComponent();
        ContentTextBox.Text = text;

        Loaded += OnLoaded;
        PreviewKeyDown += OnPreviewKeyDown;
    }

    private void OnLoaded(object sender, RoutedEventArgs e)
    {
        ContentTextBox.Focus();
        ContentTextBox.SelectAll();
    }

    private void OnPreviewKeyDown(object sender, KeyEventArgs e)
    {
        // Esc 关闭(由 IsCancel 按钮接管)
        if (e.Key == Key.Escape)
        {
            e.Handled = true;
            Close();
        }
    }

    private void CopyButton_Click(object sender, RoutedEventArgs e)
    {
        // 再试一次剪贴板(可能对方进程刚好释放了)
        try
        {
            Clipboard.SetDataObject(ContentTextBox.Text, true);
            CopyButton.Content = "已复制 ✓";
            var t = new DispatcherTimer { Interval = TimeSpan.FromSeconds(1.5) };
            t.Tick += (_, _) => { CopyButton.Content = "尝试复制"; t.Stop(); };
            t.Start();
        }
        catch
        {
            CopyButton.Content = "还是不行,手动 Ctrl+C";
            ContentTextBox.Focus();
            ContentTextBox.SelectAll();
        }
    }

    private void CloseButton_Click(object sender, RoutedEventArgs e) => Close();
}