/
App.kt
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/
App.kt
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package example
import java.awt.*
import java.awt.event.MouseAdapter
import java.awt.event.MouseEvent
import java.awt.geom.Path2D
import java.awt.image.BufferedImage
import java.awt.image.FilteredImageSource
import java.awt.image.RGBImageFilter
import javax.imageio.ImageIO
import javax.swing.*
import javax.swing.border.Border
fun makeUI() = JPanel(BorderLayout()).also {
it.add(JScrollPane(RubberBandSelectionList(makeModel())))
it.preferredSize = Dimension(320, 240)
}
private fun makeModel() = DefaultListModel<ListItem>().also {
// [XP Style Icons - Download](https://xp-style-icons.en.softonic.com/)
it.addElement(ListItem("wi0054 aaa", "example/wi0054-32.png"))
it.addElement(ListItem("test", "example/wi0062-32.png"))
it.addElement(ListItem("wi0063 00", "example/wi0063-32.png"))
it.addElement(ListItem("Test", "example/wi0064-32.png"))
it.addElement(ListItem("12345", "example/wi0096-32.png"))
it.addElement(ListItem("111111", "example/wi0054-32.png"))
it.addElement(ListItem("22222", "example/wi0062-32.png"))
it.addElement(ListItem("3333", "example/wi0063-32.png"))
}
private data class ListItem(val title: String, val iconFile: String) {
val img = makeImage(iconFile)
val icon = ImageIcon(img)
val selectedIcon: ImageIcon
init {
val ip = FilteredImageSource(img.source, SelectedImageFilter())
selectedIcon = ImageIcon(Toolkit.getDefaultToolkit().createImage(ip))
}
}
private fun makeImage(path: String): Image {
val url = Thread.currentThread().contextClassLoader.getResource(path)
return url?.openStream()?.use(ImageIO::read) ?: makeMissingImage()
}
private fun makeMissingImage(): Image {
val missingIcon = UIManager.getIcon("OptionPane.errorIcon")
val w = missingIcon.iconWidth
val h = missingIcon.iconHeight
val bi = BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB)
val g2 = bi.createGraphics()
missingIcon.paintIcon(null, g2, 0, 0)
g2.dispose()
return bi
}
private class RubberBandSelectionList(model: ListModel<ListItem>) : JList<ListItem>(model) {
private var rbl: RubberBandingListener? = null
private var rubberBandColor: Color? = null
private val rubberBand = Path2D.Double()
override fun updateUI() {
selectionForeground = null // Nimbus
selectionBackground = null // Nimbus
cellRenderer = null
removeMouseListener(rbl)
removeMouseMotionListener(rbl)
super.updateUI()
rubberBandColor = makeRubberBandColor(selectionBackground)
layoutOrientation = HORIZONTAL_WRAP
visibleRowCount = 0
fixedCellWidth = 62
fixedCellHeight = 62
border = BorderFactory.createEmptyBorder(10, 10, 10, 10)
cellRenderer = ListItemListCellRenderer()
rbl = RubberBandingListener()
addMouseMotionListener(rbl)
addMouseListener(rbl)
}
override fun paintComponent(g: Graphics) {
super.paintComponent(g)
val g2 = g.create() as? Graphics2D ?: return
g2.paint = selectionBackground
g2.draw(rubberBand)
g2.composite = ALPHA
g2.paint = rubberBandColor
g2.fill(rubberBand)
g2.dispose()
}
private inner class RubberBandingListener : MouseAdapter() {
private val srcPoint = Point()
override fun mouseDragged(e: MouseEvent) {
val l = e.component as? JList<*> ?: return
l.isFocusable = true
val destPoint = e.point
rubberBand.reset()
rubberBand.moveTo(srcPoint.getX(), srcPoint.getY())
rubberBand.lineTo(destPoint.getX(), srcPoint.getY())
rubberBand.lineTo(destPoint.getX(), destPoint.getY())
rubberBand.lineTo(srcPoint.getX(), destPoint.getY())
rubberBand.closePath()
val indices = (0 until l.model.size)
.filter { rubberBand.intersects(l.getCellBounds(it, it)) }
.toIntArray()
l.selectedIndices = indices
l.repaint()
}
override fun mouseReleased(e: MouseEvent) {
rubberBand.reset()
val c = e.component
c.isFocusable = true
c.repaint()
}
override fun mousePressed(e: MouseEvent) {
val l = e.component as? JList<*> ?: return
val index = l.locationToIndex(e.point)
val rect = l.getCellBounds(index, index)
if (rect.contains(e.point)) {
l.setFocusable(true)
} else {
l.clearSelection()
l.selectionModel.anchorSelectionIndex = -1
l.selectionModel.leadSelectionIndex = -1
l.setFocusable(false)
}
srcPoint.location = e.point
l.repaint()
}
}
companion object {
private val ALPHA = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, .1f)
private fun makeRubberBandColor(c: Color): Color {
val r = c.red
val g = c.green
val b = c.blue
val v = when (val max = maxOf(r, g, b)) {
r -> max shl 8
g -> max shl 4
else -> max
}
return Color(v)
}
}
}
private class SelectedImageFilter : RGBImageFilter() {
override fun filterRGB(
x: Int,
y: Int,
argb: Int,
) = argb and 0xFF_FF_FF_00.toInt() or (argb and 0xFF shr 1)
}
private class ListItemListCellRenderer : ListCellRenderer<ListItem> {
private val renderer = JPanel(BorderLayout())
private val icon = JLabel(null as? Icon?, SwingConstants.CENTER)
private val label = JLabel("", SwingConstants.CENTER)
private val focusBorder = UIManager.getBorder("List.focusCellHighlightBorder")
private val noFocusBorder = getNoFocusBorder(focusBorder)
init {
icon.isOpaque = false
label.foreground = renderer.foreground
label.background = renderer.background
label.border = noFocusBorder
renderer.isOpaque = false
renderer.border = BorderFactory.createEmptyBorder(2, 2, 2, 2)
renderer.add(icon)
renderer.add(label, BorderLayout.SOUTH)
}
private fun getNoFocusBorder(focusBorder: Border): Border {
val b = UIManager.getBorder("List.noFocusBorder")
return b ?: focusBorder.getBorderInsets(renderer).let {
BorderFactory.createEmptyBorder(it.top, it.left, it.bottom, it.right)
}
}
override fun getListCellRendererComponent(
list: JList<out ListItem>,
value: ListItem?,
index: Int,
isSelected: Boolean,
cellHasFocus: Boolean,
): Component {
if (value != null) {
label.text = value.title
label.border = if (cellHasFocus) focusBorder else noFocusBorder
if (isSelected) {
icon.icon = value.selectedIcon
label.foreground = list.selectionForeground
label.background = list.selectionBackground
label.isOpaque = true
} else {
icon.icon = value.icon
label.foreground = list.foreground
label.background = list.background
label.isOpaque = false
}
}
return renderer
}
}
fun main() {
EventQueue.invokeLater {
runCatching {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName())
}.onFailure {
it.printStackTrace()
Toolkit.getDefaultToolkit().beep()
}
JFrame().apply {
defaultCloseOperation = WindowConstants.EXIT_ON_CLOSE
contentPane.add(makeUI())
pack()
setLocationRelativeTo(null)
isVisible = true
}
}
}