Mercurial > cgi-bin > hgweb.cgi > JpegWasher

annotate src/name/blackcap/exifwasher/Misc.kt @ 60:d0b83fc1d62a default tip

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author David Barts <n5jrn@me.com>
date Sun, 26 Jul 2020 15:14:03 -0700
parents f5faf70c7d10
children
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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.border.Border
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17 import javax.swing.table.TableColumnModel
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18 import kotlin.annotation.*
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19 import kotlin.properties.ReadWriteProperty
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20 import kotlin.reflect.*
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21
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22 /**
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23 * Delegate that makes a var that can only be set once. This is commonly
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24 * needed in Swing, because some vars inevitably need to be declared at
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25 * outer levels but initialized in the Swing event dispatch thread.
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26 */
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27 class SetOnceImpl<T: Any>: ReadWriteProperty<Any?,T> {
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28 private var setOnceValue: T? = null
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29
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30 override operator fun getValue(thisRef: Any?, property: KProperty<*>): T {
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31 if (setOnceValue == null) {
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32 throw RuntimeException("${property.name} has not been initialized")
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33 } else {
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34 return setOnceValue!!
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35 }
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36 }
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37
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38 @Synchronized
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39 override operator fun setValue(thisRef: Any?, property: KProperty<*>, value: T): Unit {
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40 if (setOnceValue != null) {
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41 throw RuntimeException("${property.name} has already been initialized")
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42 }
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43 setOnceValue = value
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44 }
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45 }
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46
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47 fun <T: Any> setOnce(): SetOnceImpl<T> = SetOnceImpl<T>()
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48
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49 /**
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50 * Run something in the Swing thread, asynchronously.
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51 * @param block lambda containing code to run
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52 */
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53 fun inSwingThread(block: () -> Unit) {
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54 SwingUtilities.invokeLater(Runnable(block))
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55 }
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56
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57 /**
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58 * Run something in the Swing thread, synchronously.
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59 * @param block lambda containing code to run
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60 */
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61 fun inSynSwingThread(block: () -> Unit) {
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62 SwingUtilities.invokeAndWait(Runnable(block))
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63 }
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64
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65 /**
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66 * Make a shortcut for a menu item, using the standard combining key
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67 * (control, command, etc.) for the system we're on.
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68 * @param key KeyEvent constant describing the key
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69 */
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70 fun JMenuItem.makeShortcut(key: Int): Unit {
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71 val SC_KEY_MASK = Toolkit.getDefaultToolkit().menuShortcutKeyMask
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72 setAccelerator(KeyStroke.getKeyStroke(key, SC_KEY_MASK))
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73 }
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74
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75 /**
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76 * Given a MenuElement object, get the item whose text matches the
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77 * specified text.
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78 * @param text to match
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79 * @return first matched element, null if no match found
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80 */
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81 fun MenuElement.getItem(name: String) : JMenuItem? {
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82 subElements.forEach {
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83 val jMenuItem = it.component as? JMenuItem
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84 if (jMenuItem?.text == name) {
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85 return jMenuItem
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86 }
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87 }
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88 return null
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89 }
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90
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91 /**
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92 * Change to the standard wait cursor.
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93 */
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94 fun Component.useWaitCursor() {
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95 this.cursor = Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR)
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96 }
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97
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98 /**
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99 * Return back to the normal cursor().
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100 */
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101 fun Component.useNormalCursor() {
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102 this.cursor = Cursor.getDefaultCursor()
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103 }
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104
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105 /**
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106 * Thrown if the programmer botches something in our DSL.
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107 */
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108 class SwingWorkerException(message: String): Exception(message) { }
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109
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110 /**
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111 * A simplified SwingWorker DSL. It does not support intermediate
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112 * results. Just lets one define a background task and something
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113 * to execute when complete.
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114 *
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115 * @param T Type returned by inBackground (Java doInBackground) task.
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116 */
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117 class SwingWorkerBuilder<T>: SwingWorker<T,Unit>() {
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118 private var inBackgroundLambda: (SwingWorkerBuilder<T>.() -> T)? = null
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119 private var whenDoneLambda: (SwingWorkerBuilder<T>.() -> Unit)? = null
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120
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121 private fun <U> setOnce(prop: KMutableProperty0<(SwingWorkerBuilder<T>.() -> U)?>, value: SwingWorkerBuilder<T>.() -> U) {
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122 if (prop.get() != null) {
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123 throw SwingWorkerException(prop.name.removeSuffix("Lambda") + " already defined!")
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124 }
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125 prop.set(value)
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126 }
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127
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128 /**
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129 * Define the inBackground task.
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130 */
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131 fun inBackground(lambda: SwingWorkerBuilder<T>.() -> T): Unit {
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132 setOnce<T>(::inBackgroundLambda, lambda)
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133 }
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134
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135 /**
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136 * Define the whenDone task.
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137 */
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138 fun whenDone(lambda: SwingWorkerBuilder<T>.() -> Unit): Unit {
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139 setOnce<Unit>(::whenDoneLambda, lambda)
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140 }
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141
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142 /**
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143 * Validates we've been properly initialized.
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144 */
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145 fun validate(): Unit {
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146 if (inBackgroundLambda == null) {
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147 throw SwingWorkerException("inBackground not defined!")
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148 }
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149 }
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150
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151 /* standard overrides for SwingWorker follow */
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152
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153 override fun doInBackground(): T = inBackgroundLambda!!.invoke(this)
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154
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155 override fun done(): Unit = whenDoneLambda?.invoke(this) ?: Unit
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156 }
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157
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158 /**
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159 * Provides for an outer swingWorker block to contain the DSL.
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160 */
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161 fun <T> swingWorker(initializer: SwingWorkerBuilder<T>.() -> Unit): Unit {
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162 SwingWorkerBuilder<T>().run {
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163 initializer()
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164 validate()
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165 execute()
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166 }
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167 }
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168
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169 /**
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170 * Close a dialog (don't just hide it).
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171 */
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172 fun JDialog.close() {
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173 setVisible(false)
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174 dispose()
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175 }
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176
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177 /**
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178 * Set column width of a table.
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179 */
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180 fun JTable.setColWidth(col: Int, width: Int, string: String?) {
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181 val FUZZ = 16
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182 columnModel.getColumn(col).preferredWidth = if (string.isNullOrEmpty()) {
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183 width
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184 } else {
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185 maxOf(width, graphics.fontMetrics.stringWidth(string) + FUZZ)
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186 }
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187 }
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188
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189 /**
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190 * Set overall width of a table.
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191 */
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192 fun JTable.setOverallWidth() {
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193 val tcm = columnModel
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194 val limit = tcm.columnCount - 1
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195 var total = 0
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196 for (i in 0 .. limit) {
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197 total += tcm.getColumn(i).preferredWidth
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198 }
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199 preferredSize = Dimension(total, preferredSize.height)
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200 }
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201
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202 /**
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203 * A JTable for displaying metadata. Columns that might get harmfully
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204 * truncated have tooltips when truncation happens.
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205 */
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206 class JExifTable(rowData: Array<Array<out Any?>>, colNames: Array<out Any?>): JTable(rowData, colNames) {
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207 override fun getToolTipText(e: MouseEvent): String? {
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208 val pos = e.point
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209 val col = columnAtPoint(pos)
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210 if (!setOf("Key", "Type").contains(getColumnName(col))) {
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211 return null
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212 }
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213 val contents = getValueAt(rowAtPoint(pos), col) as String?
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214 if (contents == null) {
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215 return null
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216 }
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217 val needed = graphics.fontMetrics.stringWidth(contents)
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218 val actual = columnModel.getColumn(col).width
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219 return if (needed > actual) contents else null
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220 }
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221 }
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222
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40911898ed23 Fix multiple border glitches.
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223 /**
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224 * Add a border to a JComponent. The new border is in addition to (and outside
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225 * of) whatever existing standard border the component had.
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226 */
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227 fun JComponent.addBorder(b: Border) {
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228 if (border == null)
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229 border = b
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230 else
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231 border = BorderFactory.createCompoundBorder(b, border)
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232 }