我正在使用 GTK 平臺實(shí)現(xiàn)的 Xamarin.Forms 應(yīng)用程序。我想做的是在用戶關(guān)閉主窗口后顯示確認(rèn)警報。警報應(yīng)詢問用戶是否要繼續(xù)并退出應(yīng)用程序。這在 WPF 平臺上相當(dāng)容易，但在 GTK 平臺上卻很困難。訂閱DeleteEvent沒有幫助。我的代碼是這樣的：[STAThread]public static void Main(string[] args){ Gtk.Application.Init(); Forms.Init(); var app = new App(); var window = new FormsWindow(); window.LoadApplication(app); window.SetApplicationTitle("Nts"); window.Show(); window.DeleteEvent += Window_DeleteEvent; //this is not fired Gtk.Application.Run();}private static void Window_DeleteEvent(object o, Gtk.DeleteEventArgs args){ //show alert}預(yù)計單擊應(yīng)用程序窗口的“關(guān)閉”按鈕或 Alt + F4 將觸發(fā)DeleteEvent并調(diào)用Window_DeleteEvent邏輯，但事件不會觸發(fā)并且應(yīng)用程序關(guān)閉。更新共享項(xiàng)目：Net Standard 2.0 Xamarin.Forms 版本 4.1.0.618606GTK項(xiàng)目：Net Framework 4.8 Xamarin.Forms版本4.1.0.618606 Xamarin.Forms.Platform.GTK版本3.6.0.344457
1 回答
江戶川亂折騰
TA貢獻(xiàn)1851條經(jīng)驗(yàn) 獲得超5個贊
事實(shí)證明，解決方案非常簡單。我所要做的就是繼承
Xamarin.Forms.Platform.GTK.FormsWindow
并覆蓋
protected override bool OnDeleteEvent(Event evnt)
像這樣
public class MyFormsWindow: FormsWindow
{
protected override bool OnDeleteEvent(Event evnt)
{
var messageDialog = new MessageDialog(Program.MainWindow, DialogFlags.Modal,
MessageType.Question, ButtonsType.YesNo,
"Do you want to exit?", String.Empty)
{
Title = "Confirmation",
};
int result = messageDialog.Run();
//the magic numbers stand for "Close" and "No" results
if (result == -4
|| result == -9
{
messageDialog.Destroy();
return true; // true means not to handle the Delete event by further handlers, as result do not close application
}
else
{
messageDialog.Destroy();
return base.OnDeleteEvent(evnt);
}
}
當(dāng)然，為了使這項(xiàng)工作正常進(jìn)行，我們的主窗口應(yīng)該具有新類的類型。
public class Program
{
public static MyFormsWindow MainWindow { get; private set; }
[STAThread]
public static void Main(string[] args)
{
Gtk.Application.Init();
Forms.Init();
var app = new App();
var window = new MyFormsWindow();
window.LoadApplication(app);
window.SetApplicationTitle("MyApp");
window.Show();
MainWindow = window;
Gtk.Application.Run();
}
}
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