Mercurial > cgi-bin > hgweb.cgi > JpegWasher

annotate src/name/blackcap/exifwasher/Misc.kt @ 44:6999afa6fff3

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Update Building instructions; minor build system bug fixes.
author David Barts <davidb@stashtea.com>
date Sun, 03 May 2020 16:15:10 -0700
parents cd2ca4727b7f
children 40911898ed23
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1 /*
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2 * Miscellaneous utility stuff.
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3 */
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4 package name.blackcap.exifwasher
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5
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6 import java.awt.Component
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7 import java.awt.Cursor
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8 import java.awt.Dimension
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9 import java.awt.Font
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10 import java.awt.FontMetrics
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11 import java.awt.Graphics
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12 import java.awt.Point
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13 import java.awt.Toolkit
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14 import java.awt.event.MouseEvent
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15 import javax.swing.*
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16 import javax.swing.table.TableColumnModel
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17 import kotlin.annotation.*
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18 import kotlin.properties.ReadWriteProperty
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19 import kotlin.reflect.*
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20
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21 /**
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22 * Delegate that makes a var that can only be set once. This is commonly
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23 * needed in Swing, because some vars inevitably need to be declared at
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24 * outer levels but initialized in the Swing event dispatch thread.
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25 */
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26 class SetOnceImpl<T: Any>: ReadWriteProperty<Any?,T> {
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27 private var setOnceValue: T? = null
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28
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29 override operator fun getValue(thisRef: Any?, property: KProperty<*>): T {
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30 if (setOnceValue == null) {
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31 throw RuntimeException("${property.name} has not been initialized")
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32 } else {
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33 return setOnceValue!!
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34 }
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35 }
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36
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37 @Synchronized
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38 override operator fun setValue(thisRef: Any?, property: KProperty<*>, value: T): Unit {
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39 if (setOnceValue != null) {
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40 throw RuntimeException("${property.name} has already been initialized")
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41 }
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42 setOnceValue = value
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43 }
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44 }
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45
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46 fun <T: Any> setOnce(): SetOnceImpl<T> = SetOnceImpl<T>()
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47
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48 /**
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49 * Run something in the Swing thread, asynchronously.
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50 * @param block lambda containing code to run
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51 */
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52 fun inSwingThread(block: () -> Unit) {
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53 SwingUtilities.invokeLater(Runnable(block))
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54 }
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55
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56 /**
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57 * Run something in the Swing thread, synchronously.
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58 * @param block lambda containing code to run
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59 */
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60 fun inSynSwingThread(block: () -> Unit) {
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61 SwingUtilities.invokeAndWait(Runnable(block))
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62 }
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63
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64 /**
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65 * Make a shortcut for a menu item, using the standard combining key
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66 * (control, command, etc.) for the system we're on.
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67 * @param key KeyEvent constant describing the key
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68 */
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69 fun JMenuItem.makeShortcut(key: Int): Unit {
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70 val SC_KEY_MASK = Toolkit.getDefaultToolkit().menuShortcutKeyMask
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71 setAccelerator(KeyStroke.getKeyStroke(key, SC_KEY_MASK))
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72 }
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73
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74 /**
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75 * Given a MenuElement object, get the item whose text matches the
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76 * specified text.
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77 * @param text to match
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78 * @return first matched element, null if no match found
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79 */
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80 fun MenuElement.getItem(name: String) : JMenuItem? {
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81 subElements.forEach {
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82 val jMenuItem = it.component as? JMenuItem
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83 if (jMenuItem?.text == name) {
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84 return jMenuItem
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85 }
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86 }
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87 return null
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88 }
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89
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90 /**
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91 * Change to the standard wait cursor.
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92 */
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93 fun Component.useWaitCursor() {
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94 this.cursor = Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR)
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95 }
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96
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97 /**
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98 * Return back to the normal cursor().
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99 */
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100 fun Component.useNormalCursor() {
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101 this.cursor = Cursor.getDefaultCursor()
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102 }
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103
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104 /**
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105 * Thrown if the programmer botches something in our DSL.
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106 */
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107 class SwingWorkerException(message: String): Exception(message) { }
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108
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109 /**
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110 * A simplified SwingWorker DSL. It does not support intermediate
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111 * results. Just lets one define a background task and something
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112 * to execute when complete.
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113 *
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114 * @param T Type returned by inBackground (Java doInBackground) task.
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115 */
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116 class SwingWorkerBuilder<T>: SwingWorker<T,Unit>() {
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117 private var inBackgroundLambda: (SwingWorkerBuilder<T>.() -> T)? = null
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118 private var whenDoneLambda: (SwingWorkerBuilder<T>.() -> Unit)? = null
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119
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120 private fun <U> setOnce(prop: KMutableProperty0<(SwingWorkerBuilder<T>.() -> U)?>, value: SwingWorkerBuilder<T>.() -> U) {
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121 if (prop.get() != null) {
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122 throw SwingWorkerException(prop.name.removeSuffix("Lambda") + " already defined!")
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123 }
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124 prop.set(value)
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125 }
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126
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127 /**
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128 * Define the inBackground task.
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129 */
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130 fun inBackground(lambda: SwingWorkerBuilder<T>.() -> T): Unit {
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131 setOnce<T>(::inBackgroundLambda, lambda)
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132 }
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133
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134 /**
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135 * Define the whenDone task.
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136 */
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137 fun whenDone(lambda: SwingWorkerBuilder<T>.() -> Unit): Unit {
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138 setOnce<Unit>(::whenDoneLambda, lambda)
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139 }
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140
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141 /**
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142 * Validates we've been properly initialized.
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143 */
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144 fun validate(): Unit {
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145 if (inBackgroundLambda == null) {
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146 throw SwingWorkerException("inBackground not defined!")
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147 }
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148 }
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149
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150 /* standard overrides for SwingWorker follow */
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151
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152 override fun doInBackground(): T = inBackgroundLambda!!.invoke(this)
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153
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154 override fun done(): Unit = whenDoneLambda?.invoke(this) ?: Unit
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155 }
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156
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157 /**
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158 * Provides for an outer swingWorker block to contain the DSL.
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159 */
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160 fun <T> swingWorker(initializer: SwingWorkerBuilder<T>.() -> Unit): Unit {
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161 SwingWorkerBuilder<T>().run {
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162 initializer()
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163 validate()
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164 execute()
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165 }
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166 }
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167
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168 /**
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169 * Close a dialog (don't just hide it).
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170 */
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171 fun JDialog.close() {
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172 setVisible(false)
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173 dispose()
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174 }
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175
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176 /**
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177 * Set column width of a table.
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178 */
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179 fun JTable.setColWidth(col: Int, width: Int, string: String?) {
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180 val FUZZ = 16
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181 columnModel.getColumn(col).preferredWidth = if (string.isNullOrEmpty()) {
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182 width
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183 } else {
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184 maxOf(width, graphics.fontMetrics.stringWidth(string) + FUZZ)
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185 }
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186 }
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187
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188 /**
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189 * Set overall width of a table.
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190 */
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191 fun JTable.setOverallWidth() {
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192 val tcm = columnModel
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193 val limit = tcm.columnCount - 1
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194 var total = 0
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195 for (i in 0 .. limit) {
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196 total += tcm.getColumn(i).preferredWidth
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197 }
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198 preferredSize = Dimension(total, preferredSize.height)
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199 }
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200
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201 /**
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202 * A JTable for displaying metadata. Columns that might get harmfully
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203 * truncated have tooltips when truncation happens.
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204 */
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205 class JExifTable(rowData: Array<Array<out Any?>>, colNames: Array<out Any?>): JTable(rowData, colNames) {
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206 override fun getToolTipText(e: MouseEvent): String? {
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207 val pos = e.point
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208 val col = columnAtPoint(pos)
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209 if (!setOf("Key", "Type").contains(getColumnName(col))) {
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210 return null
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211 }
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212 val contents = getValueAt(rowAtPoint(pos), col) as String?
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213 if (contents == null) {
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214 return null
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215 }
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216 val needed = graphics.fontMetrics.stringWidth(contents)
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217 val actual = columnModel.getColumn(col).width
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218 return if (needed > actual) contents else null
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219 }
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220 }
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221