Mercurial > cgi-bin > hgweb.cgi > ClipMan

annotate src/name/blackcap/clipman/PasteboardQueue.kt @ 16:88703ca72fc3

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Make an efficiency improvement: cache the scrollPane.
author David Barts <n5jrn@me.com>
date Tue, 21 Jan 2020 13:07:35 -0800
parents d832c7b2bfd0
children c10a447b9e1b
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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 private var scrollPane: JScrollPane? = null
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25 init {
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26 var sp: Container? = parent
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27 while (sp != null) {
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28 if (sp is JScrollPane) {
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29 scrollPane = sp
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30 break
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31 }
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32 sp = sp.parent
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33 }
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34 }
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35
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36 /**
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37 * The maximum allowed size of this queue. Attempts to make the queue
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38 * larger than this size, or specifying a size smaller than the current
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39 * size, will result in the oldest item(s) being discarded. A size less
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40 * than or equal to zero means an unlimited size.
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41 */
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42 var maxSize: Int
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43 get() { return _maxSize }
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44 @Synchronized set(value) {
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45 _maxSize = value
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46 truncate()
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47 }
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48
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49 /**
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50 * Add a QueueItem to the end of the queue.
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51 * @param item QueueItem to add
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52 */
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53 @Synchronized fun add(item: QueueItem) {
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54 inSwingThread {
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55 parent.add(item.component)
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56 scrollPane?.run {
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57 validate()
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58 verticalScrollBar.run { value = maximum + 1 }
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59 }
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60 }
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61 queue.addLast(item)
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62 truncate()
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63 }
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64
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65 private fun truncate() {
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66 if (_maxSize > 0) {
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67 var size = queue.size
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68 var dirty = false
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69 while (size > _maxSize) {
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70 var extra = queue.removeFirst().component
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71 inSwingThread { parent.remove(extra) }
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72 dirty = true
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73 size -= 1
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74 }
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75 if (dirty) {
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76 inSwingThread { parent.validate() }
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77 }
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78 }
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79 }
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80 }
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81
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82 /**
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83 * An item in the above queue.
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84 */
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85 data class QueueItem(val component: JComponent, val contents: PasteboardItem)