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1 using System;
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2 using System.Collections.Generic;
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3 using System.Linq;
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4 using System.Text;
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5 using System.Windows.Forms;
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6
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7 namespace Implab.Fx
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8 {
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9 public static class ControlHelpers
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10 {
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11 /// <summary>
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12 /// Переключает обработку обещания в поток указанного элемента управления.
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13 /// </summary>
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14 /// <typeparam name="T">Тип результата обещания</typeparam>
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15 /// <param name="that">Исходное обещание</param>
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16 /// <param name="ctl">Элемент управления</param>
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17 /// <returns>Новое обещание, обработчики которого будут выполнены в потоке элемента управления.</returns>
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18 /// <exception cref="ArgumentNullException">Параметр не может быть <c>null</c>.</exception>
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19 /// <example>
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20 /// client
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21 /// .Get("description.txt") // returns a promise
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22 /// .DirectToControl(m_ctl) // handle the promise in the thread of the control
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23 /// .Then(
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24 /// description => m_ctl.Text = description // now it's safe
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25 /// )
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26 /// </example>
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27 public static Promise<T> DirectToControl<T>(this Promise<T> that, Control ctl)
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28 {
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29 if (that == null)
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30 throw new ArgumentNullException("that");
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31 if (ctl == null)
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32 throw new ArgumentNullException("ctl");
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33
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34 var directed = new Promise<T>();
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35
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36 that.Then(
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37 res =>
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38 {
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39 if (ctl.InvokeRequired)
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40 ctl.Invoke(new Action<T>(directed.Resolve),res);
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41 else
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42 directed.Resolve(res);
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43 },
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44 err =>
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45 {
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46 if (ctl.InvokeRequired)
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47 ctl.Invoke(new Action<Exception>(directed.Reject), err);
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48 else
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49 directed.Reject(err);
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50 }
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51 );
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52
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53 return directed;
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54 }
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55 }
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56 }
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