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annotate Implab.Fx/PromiseHelpers.cs @ 196:40d7fed4a09e

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fixed promise chaining behavior, the error handler doesn't handle result or cancellation handlers exceptions these exceptions are propagated to the next handlers.
author cin
date Mon, 29 Aug 2016 23:15:51 +0300
parents 2573b562e328
children
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1 using System;
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2 using System.Windows.Forms;
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3 using System.Threading;
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4
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5 namespace Implab.Fx
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6 {
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7 public static class PromiseHelpers
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8 {
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9 /// <summary>
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10 /// Перенаправляет обработку обещания в поток указанного элемента управления.
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11 /// </summary>
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12 /// <typeparam name="T">Тип результата обещания</typeparam>
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13 /// <param name="that">Исходное обещание</param>
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14 /// <param name="ctl">Элемент управления</param>
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15 /// <returns>Новое обещание, обработчики которого будут выполнены в потоке элемента управления.</returns>
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16 /// <exception cref="ArgumentNullException">Параметр не может быть <c>null</c>.</exception>
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17 /// <example>
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18 /// client
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19 /// .Get("description.txt") // returns a promise
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20 /// .DispatchToControl(m_ctl) // handle the promise in the thread of the control
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21 /// .Then(
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22 /// description => m_ctl.Text = description // now it's safe
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23 /// )
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24 /// </example>
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25 public static IPromise<T> DispatchToControl<T>(this IPromise<T> that, Control ctl)
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26 {
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27 Safe.ArgumentNotNull(that, "that");
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28 Safe.ArgumentNotNull(ctl, "ctl");
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29
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30 var directed = new ControlBoundPromise<T>(ctl);
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31
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32 directed.On(that.Cancel, PromiseEventType.Cancelled);
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34 that.On(
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35 directed.Resolve,
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36 directed.Reject,
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37 directed.Cancel
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38 );
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39
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40 return directed;
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41 }
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42 }
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43 }