Question

I am trying to close a Gtk# Window in the code by clicking a button. That is, the button should have the same effect as the X button in the title bar.

While the window does close, however, the DeleteEvent does not fire when clicking my own button, as opposed to clicking the X title bar button.

This is some minimal sample code:

    using System;

    using Gtk;

    namespace GtkSharpTest
    {
        class Program
        {
            [STAThread]
            public static void Main(string[] args)
            {
                Application.Init();

                using (Window win = new Window("Test")) {
                    win.SetSizeRequest(300, 200);
                    win.Hidden += delegate(object sender, EventArgs e) {
                        Application.Quit();
                    };
                    win.DeleteEvent += delegate(object o, DeleteEventArgs e) {
                        using (MessageDialog dlg = new MessageDialog(win,
                                                                     DialogFlags.Modal,
                                                                     MessageType.Question,
                                                                     ButtonsType.YesNo,
                                                                     "Really close?")) {
                            ResponseType result = (ResponseType)dlg.Run();
                            dlg.Destroy();
                            if (result == ResponseType.No) {
                                e.RetVal = true;
                            }
                        }
                    };

                    Button bClose = Button.NewWithLabel("Close");
                    bClose.Clicked += delegate(object sender, EventArgs e) {
                        // ???
                    };
                    win.Add(bClose);

                    win.ShowAll();
                    Application.Run();
                }
            }
        }
    }

The line that I’m looking for is marked with // ???.

I have tried various calls there:

• win.Hide();
• win.HideAll();
• win.Destroy();

Both Hide and Destroy were suggested in this forum for closing Gtk windows. The selected answer in this SO post suggests Destroy, too, and even claims that the delete event gets fired when calling that method. However, I cannot reproduce that claim; all the aforementioned methods just make the window disappear, but the DeleteEvent is only ever fired if I close the window with the X title bar button.

In other words, you could say I am looking for a Gtk# equivalent of the Windows Forms/WPF Close() methods. Calling these exactly simulates a click on the X title bar button, as the respective Closing events are fired and there is still a chance to prevent the form/window from being closed.

Answer 1

You are correct, the delete event is only fired when the window manager tries to close the window (i.e. the user clicks on the X button.)

You can use Destroy to close a window. I’m not 100% sure but I think this triggers the DestroyEvent.

However, if you want to exactly simulate clicking the X button, then you need to send a DeleteEvent with window.Event().