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// AsyncSample.cs - Async call using SynchronizationContext
//
// Author: Bertrand Lorentz <bertrand.lorentz@gmail.com>
//
// Copyright (c) 2012 Bertrand Lorentz
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of version 2 of the Lesser GNU General
// Public License as published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this program; if not, write to the
// Free Software Foundation, Inc., 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA.
namespace Samples
{
using Gtk;
using Gdk;
using System;
using System.Threading;
public class AsyncSample
{
static Label msg;
static Label label;
static Button button;
static int count;
static Thread main_thread;
public static int Main (string[] args)
{
Application.Init ();
main_thread = Thread.CurrentThread;
Gtk.Window win = new Gtk.Window ("Gtk# Hello Async World");
win.DeleteEvent += new DeleteEventHandler (Window_Delete);
label = new Label ("Doing nothing");
msg = new Label ("Do Work");
button = new Button (msg);
button.Clicked += delegate { DoWork (); };
VBox box = new VBox (true, 8);
box.Add (label);
box.Add (button);
win.Add (box);
win.BorderWidth = 4;
win.ShowAll ();
Application.Run ();
return 0;
}
#if NET_4_5 // Enable this when we require Mono 3.0
static async void DoWork ()
{
label.Text = "Starting Work";
int res = await DoLongOperation ();
CheckThread ("Updating UI");
label.Text = String.Format ("Work Done ({0})", res);
}
#else
static void DoWork ()
{
label.Text = "Starting Work";
var sc = SynchronizationContext.Current;
ThreadPool.QueueUserWorkItem (delegate {
int res = DoLongOperation ();
sc.Post (delegate {
CheckThread ("Updating UI");
label.Text = String.Format ("Work Done ({0})", res);
}, null);
});
}
#endif
static int DoLongOperation ()
{
count++;
CheckThread ("Doing long operation");
Thread.Sleep (2000);
return count;
}
static void CheckThread (string msg)
{
if (Thread.CurrentThread == main_thread) {
Console.WriteLine ("In main thread - {0}", msg);
} else {
Console.WriteLine ("Not in main thread - {0}", msg);
}
}
static void Window_Delete (object obj, DeleteEventArgs args)
{
Application.Quit ();
args.RetVal = true;
}
}
}
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