1 /* Title: Pure/General/swing_thread.scala |
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2 Author: Makarius |
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3 Author: Fabian Immler, TU Munich |
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4 |
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5 Evaluation within the AWT/Swing thread. |
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6 */ |
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7 |
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8 package isabelle |
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9 |
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10 import javax.swing.{SwingUtilities, Timer} |
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11 import java.awt.event.{ActionListener, ActionEvent} |
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12 |
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13 |
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14 object Swing_Thread |
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15 { |
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16 /* checks */ |
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17 |
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18 def assert() = Predef.assert(SwingUtilities.isEventDispatchThread()) |
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19 def require() = Predef.require(SwingUtilities.isEventDispatchThread()) |
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20 |
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21 |
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22 /* main dispatch queue */ |
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23 |
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24 def now[A](body: => A): A = |
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25 { |
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26 var result: Option[A] = None |
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27 if (SwingUtilities.isEventDispatchThread()) { result = Some(body) } |
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28 else SwingUtilities.invokeAndWait(new Runnable { def run = { result = Some(body) } }) |
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29 result.get |
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30 } |
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31 |
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32 def future[A](body: => A): Future[A] = |
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33 { |
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34 if (SwingUtilities.isEventDispatchThread()) Future.value(body) |
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35 else Future.fork { now(body) } |
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36 } |
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37 |
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38 def later(body: => Unit) |
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39 { |
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40 if (SwingUtilities.isEventDispatchThread()) body |
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41 else SwingUtilities.invokeLater(new Runnable { def run = body }) |
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42 } |
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43 |
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44 |
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45 /* delayed actions */ |
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46 |
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47 private def delayed_action(first: Boolean)(time_span: Int)(action: => Unit): () => Unit = |
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48 { |
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49 val listener = |
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50 new ActionListener { override def actionPerformed(e: ActionEvent) { action } } |
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51 val timer = new Timer(time_span, listener) |
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52 timer.setRepeats(false) |
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53 |
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54 def invoke() { if (first) timer.start() else timer.restart() } |
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55 invoke _ |
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56 } |
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57 |
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58 // delayed action after first invocation |
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59 def delay_first = delayed_action(true) _ |
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60 |
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61 // delayed action after last invocation |
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62 def delay_last = delayed_action(false) _ |
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63 } |
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