Mercurial > cgi-bin > hgweb.cgi > ClipMan

annotate src/name/blackcap/clipman/Pasteboard.kt @ 17:9dd58db4d15a

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Only convert RTF to HTML if needed. Much more efficient.
author David Barts <n5jrn@me.com>
date Tue, 21 Jan 2020 16:24:18 -0800
parents be282c48010a
children 96cc73ae2904
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0
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1 /*
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2 * We call the clipboard a "pasteboard" for our internal class name, not
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3 * because I prefer that term (I don't) but so as to not clash with the
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4 * AWT's Clipboard class.
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5 */
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6 package name.blackcap.clipman
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7
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8 import java.awt.Toolkit
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9 import java.awt.datatransfer.Clipboard
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10 import java.awt.datatransfer.ClipboardOwner
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11 import java.awt.datatransfer.DataFlavor
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12 import java.awt.datatransfer.Transferable
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13 import java.awt.datatransfer.UnsupportedFlavorException
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14 import java.io.IOException
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15 import java.io.ByteArrayInputStream
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16 import java.nio.charset.Charset
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17 import java.util.logging.Level
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18 import java.util.logging.Logger
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19 import kotlin.collections.HashMap
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20
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21 /* Constants, etc. */
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22 val CHARSET_NAME = "UTF-8"
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23
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24 /*
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25 * Represents an error dealing with pasteboard items.
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26 */
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27 class PasteboardError(): Exception()
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28
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29 /**
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30 * Represents an item of data in the clipboard and how to read and
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31 * write it.
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32 */
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33 sealed class PasteboardItem {
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34 /* the three possibilities for this class */
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35
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36 class Plain(val plain: String): PasteboardItem()
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37
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38 class HTML(val plain: String, val html: String): PasteboardItem()
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39
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40 class RTF(val plain: String, val rtf: ByteArray): PasteboardItem() {
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41 private var failed = false
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42
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43 /* lazy conversion to HTML */
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44 private var _html: String? = null
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45 val html: String?
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46 get() {
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47 if (failed || _html != null) {
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48 return _html
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49 }
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50 _html = htmlFromRTF()
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51 failed = _html == null
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52 return _html
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53 }
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54
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55 private fun htmlFromRTF(): String? {
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56 ByteArrayInputStream(rtf).use {
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57 val (html, errors) = rtfToHtml(it)
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58 if (errors != null) {
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59 LOGGER.log(Level.WARNING, errors)
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60 return null
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61 }
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62 return html
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63 }
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64 }
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65 }
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66
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67 /* we use this when writing data back to the clipboard */
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68
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69 private class PasteboardData(val item: PasteboardItem):
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70 Transferable, ClipboardOwner {
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71 private val CHARSET = Charset.forName(CHARSET_NAME)
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72 private val HTML_FLAVOR = DataFlavor("text/html; document=all; class=\"[B\"; charset=" + CHARSET_NAME)
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73 private val _data: HashMap<DataFlavor, Any>
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74 private val flavors: Array<DataFlavor>
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75
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76 init {
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77 _data = HashMap<DataFlavor, Any>().apply {
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78 when (item) {
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79 is Plain -> put(DataFlavor.stringFlavor, item.plain as Any)
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80 is HTML -> {
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81 put(DataFlavor.stringFlavor, item.plain as Any)
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82 put(HTML_FLAVOR, item.html.toByteArray(CHARSET) as Any)
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83 }
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84 is RTF -> {
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85 put(DataFlavor.stringFlavor, item.plain as Any)
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86 if (item.html != null) {
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87 put(HTML_FLAVOR, item.html?.toByteArray(CHARSET) as Any)
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88 }
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89 }
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90 }
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91 }
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92 _data.keys.asIterable().run {
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93 flavors = Array<DataFlavor>(count()) { elementAt(it) }
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94 }
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95 }
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96
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97 override fun getTransferData(flavor: DataFlavor): Any {
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98 return _data.get(flavor) ?: throw UnsupportedFlavorException(flavor)
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99 }
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100
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101 override fun getTransferDataFlavors(): Array<DataFlavor> = flavors
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102 override fun isDataFlavorSupported(flavor: DataFlavor) = _data.containsKey(flavor)
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103 override fun lostOwnership(clipboard: Clipboard, contents: Transferable) {}
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104 }
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105
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106 override operator fun equals(other: Any?): Boolean {
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107 return when (this) {
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108 is Plain -> (other is Plain) && (this.plain == other.plain)
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109 is HTML -> (other is HTML) && (this.html == other.html)
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110 is RTF -> (other is RTF) && (this.rtf contentEquals other.rtf)
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111 }
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112 }
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113
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114 companion object {
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115 private val RTF_FLAVOR = DataFlavor("text/rtf; class=\"[B\"")
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116 private val CLIPBOARD = Toolkit.getDefaultToolkit().systemClipboard
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117
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118 /**
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119 * Read the item in the pasteboard.
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120 * @return a PasteboardItem? object, null if nothing could be read
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121 */
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122 fun read() : PasteboardItem? {
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123 check()
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124 val plain = getClipboardData(DataFlavor.stringFlavor) as String?
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125 if (plain == null) {
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126 return null
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127 }
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128 val html = getClipboardData(DataFlavor.allHtmlFlavor) as String?
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129 if (html == null) {
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130 val rtf = getClipboardData(RTF_FLAVOR) as ByteArray?
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131 return if (rtf == null) { Plain(plain) } else { RTF(plain, rtf) }
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132 } else {
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133 return HTML(plain, html)
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134 }
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135 }
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136
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137 /**
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138 * Write an item to the pasteboard.
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139 * @param item a PasteboardItem to write
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140 */
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141 fun write(item: PasteboardItem) {
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142 check()
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143 val pbdata = PasteboardData(item)
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144 CLIPBOARD.setContents(pbdata, pbdata)
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145 }
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146
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147 private fun check() {
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148 if (CLIPBOARD == null) {
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149 throw RuntimeException("no clipboard available!")
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150 }
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151 }
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152
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153 private fun getClipboardData(flavor: DataFlavor): Any? {
0
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154 try {
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155 return CLIPBOARD.getData(flavor)
0
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156 } catch (e: IOException) {
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157 return null
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158 } catch (e: UnsupportedFlavorException) {
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159 return null
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160 }
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161 }
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162 }
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163 }