csharp: Add Idlers tutorial

Reviewers: lauromoura, vitor.sousa

Reviewed By: vitor.sousa

Differential Revision: https://phab.enlightenment.org/D6980

reference/csharp/core/src/core_idler.cs

@@ -0,0 +1,52 @@
+/*
+ * Efl Core Idler examples.
+ *
+ * Here we register callbacks to execute code when the loop is idle.
+ * We also record when we enter or exit the idle state.
+ *
+ * We initiate a timer to exit the idle state and then exit the application.
+ */
+
+using System;
+
+public class Example
+{
+#if WIN32
+    [STAThreadAttribute()]
+#endif
+    public static void Main()
+    {
+        // Initialize EFL and all UI components
+        efl.All.Init();
+
+        // Retrieve the application's main loop
+        var mainloop = efl.App.GetLoopMain();
+
+        // Register to all Idle events
+        mainloop.IdleEnterEvt += (object sender, EventArgs e) => {
+          Console.WriteLine("IDLE ENTER: Entering idle state.");
+        };
+        mainloop.IdleEvt += (object sender, EventArgs e) => {
+          Console.WriteLine("IDLE: Executing idler callback while in idle state.");
+        };
+        mainloop.IdleExitEvt += (object sender, EventArgs e) => {
+          Console.WriteLine("IDLE EXIT: Leaving idle state.");
+        };
+
+        // Use a timer to exit the application
+        new efl.Loop_Timer(mainloop, (efl.ILoop_Timer etimer) => {
+            // Trigger after 10ms
+            etimer.SetInterval(0.01);
+            etimer.TickEvt += (object sender, EventArgs e) => {
+              Console.WriteLine("TIMER: timer callback called, exiting.");
+              mainloop.Quit(new eina.Value(0));
+            };
+        });
+
+        // Start the EFL main loop (and the experiment)
+        mainloop.Begin();
+
+        // Shutdown EFL
+        efl.All.Shutdown();
+    }
+}

reference/csharp/core/src/meson.build

@@ -6,3 +6,10 @@ executable('efl_reference_core_event',
   cs_args : efl_mono_libs,
   install : true
 )
+
+executable('efl_reference_core_idler',
+  files(['core_idler.cs']),
+  dependencies : deps,
+  cs_args : efl_mono_libs,
+  install : true
+)