Mercurial > cgi-bin > hgweb.cgi > ClipMan

annotate src/name/blackcap/clipman/PasteboardQueue.kt @ 54:a9d5c94a177c

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Add README file.
author David Barts <n5jrn@me.com>
date Tue, 13 Apr 2021 10:33:33 -0700
parents 19d9da731c43
children
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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.DefaultHighlighter
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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(val inQueue: Int, val 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.view.contents)
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60 validate()
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61 }
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62 queue.addLast(item)
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63 truncate()
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64 }
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65
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66 /**
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67 * Find and highlight the next occurrence of the specified string
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68 * @param string to search
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69 * @param whether to search backwards (default forwards)
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70 * @param case-folding flag (default true)
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71 * @param starting point (0, 0) for forwards, (m, n) for backwards
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72 * @return position where start of string was found, or null
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73 */
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74 fun find(needle: String, direction: Direction = Direction.FORWARDS,
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75 foldCase: Boolean = true, origin: Offset? = null): Offset?
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76 {
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77 /* clean up any old highlights */
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78 queue.forEach {
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79 val hiliter = it.view.searchable.highlighter
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80 hiliter.highlights.forEach {
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81 hiliter.removeHighlight(it)
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82 }
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83 }
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84
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85 /* get starting item index */
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86 val qMax = queue.size
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87 var norigin = origin ?: when (direction) {
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88 Direction.FORWARDS -> Offset(0, 0)
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89 Direction.BACKWARDS -> Offset(qMax - 1, -1)
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90 }
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91
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92 /* loop initialization */
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93 val (start, incr, search) = if (direction == Direction.FORWARDS) {
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94 Triple( 0, 1, { n: String, h: String, o: Int -> h.indexOf(n, o, foldCase) })
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95 } else {
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96 Triple(-1, -1, { n: String, h: String, o: Int -> h.lastIndexOf(n, o, foldCase) })
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97 }
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98 val painter = DefaultHighlighter.DefaultHighlightPainter(null);
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99 var pos = -1
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100
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101 /* try and find it */
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102 while (norigin.inQueue >= 0 && norigin.inQueue < qMax) {
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103 val si = queue.get(norigin.inQueue).view.searchable
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104 val doc = si.document
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105 val text = doc.getText(0, doc.length)
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106 pos = if (norigin.inItem >= 0) norigin.inItem else text.length - 1
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107 pos = search(needle, text, pos)
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108 if (pos >= 0) {
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109 si.highlighter.addHighlight(pos, pos+needle.length, painter)
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110 val r = si.modelToView(pos).apply {
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111 add(si.modelToView(pos + needle.length - 1))
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112 }
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113 si.scrollRectToVisible(r)
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114 break
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115 }
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116 norigin = Offset(norigin.inQueue + incr, start)
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117 }
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118 return if (pos >= 0) Offset(norigin.inQueue, pos) else null
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119 }
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120
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121 /**
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122 * Ensure none of the searchables in this queue are selected.
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123 */
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124 fun deselectAll() {
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125 queue.forEach {
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126 val s = it.view.searchable as? ClipText
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127 if (s != null && s.selected) {
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128 s.selected = false
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129 s.validate()
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130 }
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131 }
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132 }
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133
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134 /**
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135 * Return the selected item, or null if nothing has been selected
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136 */
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137 fun getSelected(): QueueItem? {
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138 queue.forEach {
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139 if ((it.view.searchable as? ClipText)?.selected ?: false) {
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140 return it
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141 }
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142 }
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143 return null
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144 }
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145
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146 private fun truncate() {
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147 if (_maxSize > 0) {
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148 var size = queue.size
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149 var dirty = false
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150 while (size > _maxSize) {
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151 var extra = queue.removeFirst().view
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152 inSwingThread {
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153 if (extra.searchable.selected) {
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154 Application.anyRequired.disable()
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155 Application.styledRequired.disable()
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156 }
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157 parent.remove(extra.contents)
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158 }
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159 dirty = true
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160 size -= 1
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161 }
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162 if (dirty) {
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163 inSwingThread { validate() }
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164 }
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165 }
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166 }
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167
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168 private fun validate()
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169 {
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170 if (scrollPane == null) {
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171 parent.validate()
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172 } else {
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173 scrollPane!!.run {
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174 validate()
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175 verticalScrollBar.run { value = maximum + 1 }
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176 }
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177 }
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178 }
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179 }
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180
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181 /**
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182 * An item in the above queue. Linking model to view here sorta violates
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183 * MVC principles, but rules are sometimes best broken. Doing it this way
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184 * makes it impossible for the view queue to fail to follow the data
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185 * queue.
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186 */
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187 data class QueueItem(val contents: PasteboardItem, val view: PasteboardItemView)