Mercurial > cgi-bin > hgweb.cgi > ClipMan

annotate src/name/blackcap/clipman/PasteboardQueue.kt @ 23:14049bc97a7c

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More package stuff.
author David Barts <n5jrn@me.com>
date Thu, 23 Jan 2020 14:29:32 -0800
parents c10a447b9e1b
children 8aa2dfac27eb
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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 import javax.swing.text.JTextComponent
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16 /**
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17 * A queue that tracks the data we display and the widgets used to
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18 * display them. We never explicitly remove stuff from the queue,
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19 * though items will get silently discarded to prevent the queue from
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20 * exceeding the specified maximum size.
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21 */
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22 class PasteboardQueue(val parent: Container, maxSize: Int) {
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23 private val queue = LinkedList<QueueItem>()
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24 private var _maxSize = maxSize
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25 private var scrollPane: JScrollPane? = null
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26 init {
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27 var sp: Container? = parent
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28 while (sp != null) {
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29 if (sp is JScrollPane) {
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30 scrollPane = sp
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31 break
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32 }
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33 sp = sp.parent
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34 }
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35 }
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36
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37 data class Offset(var inQueue: Int, var inItem: Int)
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38 enum class Direction { FORWARDS, BACKWARDS }
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39
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40 /**
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41 * The maximum allowed size of this queue. Attempts to make the queue
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42 * larger than this size, or specifying a size smaller than the current
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43 * size, will result in the oldest item(s) being discarded. A size less
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44 * than or equal to zero means an unlimited size.
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45 */
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46 var maxSize: Int
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47 get() { return _maxSize }
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48 @Synchronized set(value) {
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49 _maxSize = value
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50 truncate()
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51 }
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52
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53 /**
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54 * Add a QueueItem to the end of the queue.
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55 * @param item QueueItem to add
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56 */
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57 @Synchronized fun add(item: QueueItem) {
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58 inSwingThread {
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59 parent.add(item.component)
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60 scrollPane?.run {
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61 validate()
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62 verticalScrollBar.run { value = maximum + 1 }
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63 }
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64 }
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65 queue.addLast(item)
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66 truncate()
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67 }
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68
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69 /**
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70 * Find and highlight the next occurrence of the specified string
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71 * @param string to search
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72 * @param whether to search backwards (default forwards)
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73 * @param case-folding flag (default true)
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74 * @param starting point (0, 0) for forwards, (m, n) for backwards
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75 * @return position where start of string was found, or null
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76 */
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77 fun find(needle: String, direction: Direction = Direction.FORWARDS,
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78 foldCase: Boolean = true, origin: Offset? = null): Offset?
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79 {
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80 /* canonicalize the origin */
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81 val norigin = if (origin == null) {
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82 if (direction == Direction.FORWARDS) {
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83 Offset(0, 0)
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84 } else {
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85 Offset(queue.size - 1, queue.last.searchable.document.length)
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86 }
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87 } else {
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88 origin
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89 }
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90
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91 /* XXX - not finished */
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92 return null
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93 }
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94
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95 private fun truncate() {
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96 if (_maxSize > 0) {
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97 var size = queue.size
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98 var dirty = false
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99 while (size > _maxSize) {
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100 var extra = queue.removeFirst().component
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101 inSwingThread { parent.remove(extra) }
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102 dirty = true
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103 size -= 1
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104 }
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105 if (dirty) {
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106 inSwingThread { parent.validate() }
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107 }
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108 }
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109 }
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110 }
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111
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112 /**
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113 * An item in the above queue.
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114 */
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115 data class QueueItem(
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116 val component: JComponent,
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117 val searchable: JTextComponent,
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118 val contents: PasteboardItem)