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1 /* Title: Pure/GUI/swing_thread.scala |
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2 Author: Makarius |
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3 |
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4 Evaluation within the AWT/Swing thread. |
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5 */ |
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6 |
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7 package isabelle |
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8 |
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9 import javax.swing.{SwingUtilities, Timer} |
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10 import java.awt.event.{ActionListener, ActionEvent} |
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11 |
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12 |
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13 object Swing_Thread |
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14 { |
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15 /* checks */ |
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16 |
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17 def assert[A](body: => A) = |
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18 { |
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19 Predef.assert(SwingUtilities.isEventDispatchThread()) |
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20 body |
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21 } |
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22 |
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23 def require[A](body: => A) = |
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24 { |
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25 Predef.require(SwingUtilities.isEventDispatchThread()) |
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26 body |
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27 } |
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28 |
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29 |
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30 /* main dispatch queue */ |
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31 |
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32 def now[A](body: => A): A = |
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33 { |
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34 if (SwingUtilities.isEventDispatchThread()) body |
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35 else { |
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36 lazy val result = { assert(); Exn.capture(body) } |
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37 SwingUtilities.invokeAndWait(new Runnable { def run = result }) |
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38 Exn.release(result) |
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39 } |
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40 } |
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41 |
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42 def future[A](body: => A): Future[A] = |
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43 { |
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44 if (SwingUtilities.isEventDispatchThread()) Future.value(body) |
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45 else Future.fork { now(body) } |
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46 } |
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47 |
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48 def later(body: => Unit) |
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49 { |
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50 if (SwingUtilities.isEventDispatchThread()) body |
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51 else SwingUtilities.invokeLater(new Runnable { def run = body }) |
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52 } |
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53 |
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54 |
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55 /* delayed actions */ |
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56 |
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57 abstract class Delay extends |
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58 { |
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59 def invoke(): Unit |
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60 def revoke(): Unit |
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61 def postpone(time: Time): Unit |
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62 } |
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63 |
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64 private def delayed_action(first: Boolean)(time: => Time)(action: => Unit): Delay = |
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65 new Delay { |
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66 private val timer = new Timer(time.ms.toInt, null) |
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67 timer.setRepeats(false) |
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68 timer.addActionListener(new ActionListener { |
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69 override def actionPerformed(e: ActionEvent) { |
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70 assert() |
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71 timer.setInitialDelay(time.ms.toInt) |
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72 action |
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73 } |
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74 }) |
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75 |
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76 def invoke() |
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77 { |
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78 require() |
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79 if (first) timer.start() else timer.restart() |
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80 } |
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81 |
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82 def revoke() |
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83 { |
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84 require() |
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85 timer.stop() |
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86 timer.setInitialDelay(time.ms.toInt) |
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87 } |
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88 |
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89 def postpone(alt_time: Time) |
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90 { |
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91 require() |
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92 if (timer.isRunning) { |
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93 timer.setInitialDelay(timer.getInitialDelay max alt_time.ms.toInt) |
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94 timer.restart() |
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95 } |
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96 } |
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97 } |
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98 |
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99 // delayed action after first invocation |
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100 def delay_first = delayed_action(true) _ |
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101 |
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102 // delayed action after last invocation |
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103 def delay_last = delayed_action(false) _ |
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104 } |