Mercurial > cgi-bin > hgweb.cgi > ClipMan

annotate src/name/blackcap/clipman/PasteboardQueue.kt @ 9:8fcff14defa2

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Stomp out race conditions and set width adaptively.
author David Barts <n5jrn@me.com>
date Sun, 19 Jan 2020 15:43:01 -0800
parents d832c7b2bfd0
children 88703ca72fc3
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1 /*
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2 * The queue of pasteboard items we manage. New stuff gets added to the
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3 * tail, and old stuff truncated off the head.
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4 */
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5 package name.blackcap.clipman
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6
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7 import java.awt.Container
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8 import java.awt.Rectangle
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9 import java.util.Collections
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10 import java.util.LinkedList
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11 import java.util.logging.Level
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12 import java.util.logging.Logger
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13 import javax.swing.*
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14
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15 /**
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16 * A queue that tracks the data we display and the widgets used to
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17 * display them. We never explicitly remove stuff from the queue,
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18 * though items will get silently discarded to prevent the queue from
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19 * exceeding the specified maximum size.
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20 */
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21 class PasteboardQueue(val parent: Container, maxSize: Int) {
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22 private val queue = LinkedList<QueueItem>()
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23 private var _maxSize = maxSize
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24
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25 /**
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26 * The maximum allowed size of this queue. Attempts to make the queue
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27 * larger than this size, or specifying a size smaller than the current
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28 * size, will result in the oldest item(s) being discarded. A size less
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29 * than or equal to zero means an unlimited size.
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30 */
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31 var maxSize: Int
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32 get() { return _maxSize }
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33 @Synchronized set(value) {
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34 _maxSize = value
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35 truncate()
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36 }
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37
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38 /**
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39 * Add a QueueItem to the end of the queue.
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40 * @param item QueueItem to add
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41 */
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42 @Synchronized fun add(item: QueueItem) {
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43 inSwingThread {
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44 parent.add(item.component)
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45 /* XXX - assumes there is a JScrollPane above us in the tree */
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46 var sp = parent.parent
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47 while (sp != null && !(sp is JScrollPane)) {
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48 sp = sp.parent
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49 }
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50 (sp as JScrollPane).run {
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51 validate()
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52 verticalScrollBar.run { value = maximum + 1 }
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53 }
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54 }
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55 queue.addLast(item)
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56 truncate()
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57 }
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58
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59 private fun truncate() {
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60 if (_maxSize > 0) {
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61 var size = queue.size
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62 var dirty = false
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63 while (size > _maxSize) {
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64 var extra = queue.removeFirst().component
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65 inSwingThread { parent.remove(extra) }
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66 dirty = true
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67 size -= 1
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68 }
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69 if (dirty) {
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70 inSwingThread { parent.validate() }
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71 }
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72 }
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73 }
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74 }
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76 /**
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77 * An item in the above queue.
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78 */
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79 data class QueueItem(val component: JComponent, val contents: PasteboardItem)