diff Implab.Fx/ControlHelpers.cs @ 3:1e9583086e99

Added Impl.Fx
author cin
date Fri, 13 Sep 2013 12:54:28 +0400
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Implab.Fx/ControlHelpers.cs	Fri Sep 13 12:54:28 2013 +0400
@@ -0,0 +1,56 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows.Forms;
+
+namespace Implab.Fx
+{
+    public static class ControlHelpers
+    {
+        /// <summary>
+        /// Переключает обработку обещания в поток указанного элемента управления.
+        /// </summary>
+        /// <typeparam name="T">Тип результата обещания</typeparam>
+        /// <param name="that">Исходное обещание</param>
+        /// <param name="ctl">Элемент управления</param>
+        /// <returns>Новое обещание, обработчики которого будут выполнены в потоке элемента управления.</returns>
+        /// <exception cref="ArgumentNullException">Параметр не может быть <c>null</c>.</exception>
+        /// <example>
+        /// client
+        ///     .Get("description.txt") // returns a promise
+        ///     .DirectToControl(m_ctl) // handle the promise in the thread of the control
+        ///     .Then(
+        ///         description => m_ctl.Text = description // now it's safe
+        ///     )
+        /// </example>
+        public static Promise<T> DirectToControl<T>(this Promise<T> that, Control ctl)
+        {
+            if (that == null)
+                throw new ArgumentNullException("that");
+            if (ctl == null)
+                throw new ArgumentNullException("ctl");
+
+            var directed = new Promise<T>();
+
+            that.Then(
+                res =>
+                {
+                    if (ctl.InvokeRequired)
+                        ctl.Invoke(new Action<T>(directed.Resolve),res);
+                    else
+                        directed.Resolve(res);
+                },
+                err =>
+                {
+                    if (ctl.InvokeRequired)
+                        ctl.Invoke(new Action<Exception>(directed.Reject), err);
+                    else
+                        directed.Reject(err);
+                }
+            );
+
+            return directed;
+        }
+    }
+}