Mercurial > cgi-bin > hgweb.cgi > ClipMan

annotate src/name/blackcap/clipman/Pasteboard.kt @ 1:fb224c3aebdf

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Got it auto-scrolling to the bottom.
author David Barts <n5jrn@me.com>
date Sat, 18 Jan 2020 09:12:58 -0800
parents be282c48010a
children 9dd58db4d15a
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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.InputStream
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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 data class Plain(val plain: String): PasteboardItem()
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35 data class HTML(val plain: String, val html: String): PasteboardItem()
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36
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37 private class PasteboardData(val item: PasteboardItem):
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38 Transferable, ClipboardOwner {
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39 private val CHARSET = Charset.forName(CHARSET_NAME)
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40 private val HTML_FLAVOR = DataFlavor("text/html; document=all; class=\"[B\"; charset=" + CHARSET_NAME)
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41 private val _data: HashMap<DataFlavor, Any>
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42 private val flavors: Array<DataFlavor>
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43
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44 init {
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45 _data = HashMap<DataFlavor, Any>().apply {
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46 when (item) {
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47 is Plain -> put(DataFlavor.stringFlavor, item.plain as Any)
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48 is HTML -> {
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49 put(DataFlavor.stringFlavor, item.plain as Any)
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50 put(HTML_FLAVOR, item.html as Any)
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51 }
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52 }
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53 }
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54 _data.keys.asIterable().run {
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55 flavors = Array<DataFlavor>(count()) { elementAt(it) }
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56 }
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57 }
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58
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59 override fun getTransferData(flavor: DataFlavor): Any {
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60 return _data.get(flavor) ?: throw UnsupportedFlavorException(flavor)
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61 }
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62
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63 override fun getTransferDataFlavors(): Array<DataFlavor> = flavors
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64 override fun isDataFlavorSupported(flavor: DataFlavor) = _data.containsKey(flavor)
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65 override fun lostOwnership(clipboard: Clipboard, contents: Transferable) {}
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66 }
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67
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68 companion object {
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69 private val CLIPBOARD = Toolkit.getDefaultToolkit().systemClipboard
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70
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71 /**
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72 * Read the item in the pasteboard.
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73 * @return a PasteboardItem? object, null if nothing could be read
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74 */
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75 fun read() : PasteboardItem? {
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76 check()
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77 var plain = getClipboardData(DataFlavor.stringFlavor)
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78 if (plain == null) {
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79 return null
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80 }
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81 var html = getClipboardData(DataFlavor.allHtmlFlavor)
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82 if (html == null) {
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83 html = htmlFromRTF()
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84 }
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85 return if (html == null) { Plain(plain) } else { HTML(plain, html) }
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86 }
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87
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88 /**
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89 * Write an item to the pasteboard.
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90 * @param item a PasteboardItem to write
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91 */
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92 fun write(item: PasteboardItem) {
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93 check()
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94 val pbdata = PasteboardData(item)
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95 CLIPBOARD.setContents(pbdata, pbdata)
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96 }
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97
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98 private fun check() {
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99 if (CLIPBOARD == null) {
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100 throw RuntimeException("no clipboard available!")
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101 }
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102 }
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103
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104 private fun getClipboardData(flavor: DataFlavor): String? {
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105 try {
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106 return CLIPBOARD.getData(flavor) as String?
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107 } catch (e: IOException) {
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108 return null
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109 } catch (e: UnsupportedFlavorException) {
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110 return null
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111 }
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112 }
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113
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114 private fun htmlFromRTF(): String? {
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115 /* see if there's an appropriate flavor */
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116 var rtf: DataFlavor? = null
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117 for (flavor in CLIPBOARD.availableDataFlavors) {
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118 if (flavor.isRepresentationClassInputStream() &&
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119 "text".equals(flavor.primaryType ?: "", ignoreCase=true) &&
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120 "rtf".equals(flavor.subType ?: "", ignoreCase=true)) {
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121 rtf = flavor
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122 break
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123 }
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124 }
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125 if (rtf == null) {
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126 return null
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127 }
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128
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129 (CLIPBOARD.getData(rtf) as InputStream).use {
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130 val (html, errors) = rtfToHtml(it)
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131 if (errors != null) {
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132 LOGGER.log(Level.WARNING, errors)
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133 return null
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134 }
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135 return html
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136 }
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137 }
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138 }
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139 }