Mercurial > cgi-bin > hgweb.cgi > ClipMan
annotate src/name/blackcap/clipman/Pasteboard.kt @ 47:19d9da731c43
Recoded; cleaned up root namespace, removed race conditions.
author | David Barts <n5jrn@me.com> |
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date | Sun, 12 Apr 2020 14:31:06 -0700 |
parents | 33fbe3a78d84 |
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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 /* Kotlin bug: compaion class fails to see these unless they are out here. */ |
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22 private val HTML_FLAVOR = DataFlavor("text/html; document=all; class=\"[B\"; charset=" + CHARSET_NAME) |
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23 |
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24 /** |
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25 * Represents an item of data in the clipboard and how to read and |
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26 * write it. |
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27 */ |
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28 sealed class PasteboardItem { |
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29 /* the three possibilities for this class */ |
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30 |
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31 class Plain(val plain: String): PasteboardItem() |
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32 |
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33 class HTML(val plain: String, val html: String): PasteboardItem() |
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34 |
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35 class RTF(val plain: String, val rtf: ByteArray): PasteboardItem() { |
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36 private var failed = false |
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37 |
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38 /* lazy conversion to HTML */ |
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39 private var _html: String? = null |
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40 val html: String? |
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41 get() { |
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42 if (failed || _html != null) { |
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43 return _html |
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44 } |
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45 _html = htmlFromRTF() |
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46 failed = _html == null |
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47 return _html |
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48 } |
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49 |
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50 private fun htmlFromRTF(): String? { |
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51 ByteArrayInputStream(rtf).use { |
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52 val (html, errors) = rtfToHtml(it) |
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53 if (errors != null) { |
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54 LOGGER.log(Level.WARNING, errors) |
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55 return null |
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56 } |
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57 return html |
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58 } |
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59 } |
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60 } |
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61 |
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62 /* we use this when writing data back to the clipboard */ |
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63 |
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64 private class PasteboardData(val item: PasteboardItem): |
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65 Transferable, ClipboardOwner { |
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66 private val _data: HashMap<DataFlavor, Any> |
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67 private val flavors: Array<DataFlavor> |
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68 |
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69 init { |
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70 _data = HashMap<DataFlavor, Any>().apply { |
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71 when (item) { |
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72 is Plain -> put(DataFlavor.stringFlavor, item.plain as Any) |
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73 is HTML -> { |
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74 put(DataFlavor.stringFlavor, item.plain as Any) |
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75 put(HTML_FLAVOR, item.html.toByteArray(CHARSET) as Any) |
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76 } |
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77 is RTF -> { |
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78 put(DataFlavor.stringFlavor, item.plain as Any) |
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79 if (item.html != null) { |
18 | 80 put(HTML_FLAVOR, item.html!!.toByteArray(CHARSET) as Any) |
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81 } |
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82 } |
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83 } |
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84 } |
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85 _data.keys.asIterable().run { |
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86 flavors = Array<DataFlavor>(count()) { elementAt(it) } |
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87 } |
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88 } |
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89 |
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90 override fun getTransferData(flavor: DataFlavor): Any { |
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91 return _data.get(flavor) ?: throw UnsupportedFlavorException(flavor) |
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92 } |
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93 |
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94 override fun getTransferDataFlavors(): Array<DataFlavor> = flavors |
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95 override fun isDataFlavorSupported(flavor: DataFlavor) = _data.containsKey(flavor) |
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96 override fun lostOwnership(clipboard: Clipboard, contents: Transferable) {} |
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97 } |
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98 |
18 | 99 /** |
100 * Compare this PasteboardItem with another object. | |
101 * @param other object | |
102 * @return true iff this item's type and native content match the other's | |
103 */ | |
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104 override operator fun equals(other: Any?): Boolean { |
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105 return when (this) { |
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106 is Plain -> (other is Plain) && (this.plain == other.plain) |
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107 is HTML -> (other is HTML) && (this.html == other.html) |
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108 is RTF -> (other is RTF) && (this.rtf contentEquals other.rtf) |
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109 } |
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110 } |
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111 |
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112 companion object { |
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113 private val RTF_FLAVOR = DataFlavor("text/rtf; class=\"[B\"") |
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114 private val CLIPBOARD = Toolkit.getDefaultToolkit().systemClipboard |
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115 |
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116 /** |
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117 * Read the item in the pasteboard. |
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118 * @return a PasteboardItem? object, null if nothing could be read |
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119 */ |
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120 fun read() : PasteboardItem? { |
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121 check() |
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122 val plain = getClipboardData(DataFlavor.stringFlavor) as String? |
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123 if (plain == null) { |
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124 return null |
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125 } |
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126 val html = getClipboardData(HTML_FLAVOR) as ByteArray? |
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127 if (html == null) { |
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128 val rtf = getClipboardData(RTF_FLAVOR) as ByteArray? |
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129 return if (rtf == null) { Plain(plain) } else { RTF(plain, rtf) } |
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130 } else { |
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131 return HTML(plain, html.toString(CHARSET)) |
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132 } |
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133 } |
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134 |
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135 /** |
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136 * Write an item to the pasteboard. |
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137 * @param item a PasteboardItem to write |
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138 */ |
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139 fun write(item: PasteboardItem) { |
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140 check() |
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141 val pbdata = PasteboardData(item) |
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142 CLIPBOARD.setContents(pbdata, pbdata) |
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143 } |
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144 |
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145 private fun check() { |
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146 if (CLIPBOARD == null) { |
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147 throw RuntimeException("no clipboard available!") |
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148 } |
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149 } |
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150 |
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151 private fun getClipboardData(flavor: DataFlavor): Any? { |
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152 try { |
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153 return CLIPBOARD.getData(flavor) |
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154 } catch (e: IOException) { |
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155 return null |
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156 } catch (e: UnsupportedFlavorException) { |
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157 return null |
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158 } |
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159 } |
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160 } |
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161 } |