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// Copyright by Barry G. Becker, 2017. Licensed under MIT License: http://www.opensource.org/licenses/MIT
package com.barrybecker4.ui.components
import com.barrybecker4.math.complex.ComplexNumber
import com.barrybecker4.math.complex.ComplexNumberRange
import javax.swing.BorderFactory
import javax.swing.JLabel
import javax.swing.JOptionPane
import javax.swing.JPanel
import javax.swing.JTextField
import java.awt.BorderLayout
import java.awt.Component
import java.awt.Dimension
import java.awt.event._
object ComplexNumberInput {
/** everything is allowed by default */
private val DEFAULT_RANGE = ComplexNumberRange(
new ComplexNumber(-Double.MaxValue, -Double.MaxValue),
new ComplexNumber(Double.MaxValue, Double.MaxValue)
)
}
/**
* A panel that allows the user to enter a complex number.
* There are two numeric fields, one for the real part, and one for the imaginary part.
* @param labelText label for the number input element
* @param initialValue the value to use if nothing else if entered. shows in the ui.
* @param toolTip the tooltip for the whole panel
* @param allowedRange defines a bounding box of allowed numbers that cna be input by the user.
* @author Barry Becker
*/
class ComplexNumberInput(val labelText: String, var initialValue: ComplexNumber,
val toolTip: String, val allowedRange: ComplexNumberRange) extends JPanel {
setAllowedRange(allowedRange)
private val realNumberField = createNumberField(initialValue.real, toolTip)
private val imaginaryNumberField = createNumberField(initialValue.imaginary, toolTip)
private var range: ComplexNumberRange = _
setLayout(new BorderLayout)
setAlignmentX(Component.LEFT_ALIGNMENT)
val label = new JLabel(labelText)
add(label, BorderLayout.WEST)
val numPanel = new JPanel
numPanel.setBorder(BorderFactory.createEmptyBorder(0, 2, 0, 2))
numPanel.add(realNumberField)
numPanel.add(imaginaryNumberField)
add(numPanel, BorderLayout.EAST)
setToolTipText(if (toolTip != null) toolTip
else labelText)
/** Often the initial value cannot be set when initializing the content of a dialog.
* This uses a default of 0 until the real default can be set with setInitialValue.
* @param labelText label for the number input element
*/
def this(labelText: String) = {
this(labelText, new ComplexNumber(0, 0), null, ComplexNumberInput.DEFAULT_RANGE)
}
/** @param labelText label for the number input element
* @param initialValue the value to use if nothing else if entered. shows in the ui.
*/
def this(labelText: String, initialValue: ComplexNumber) = {
this(labelText, initialValue, null, ComplexNumberInput.DEFAULT_RANGE)
}
private def createNumberField(initialValue: Double, toolTip: String) = {
val initialVal = initialValue.toString
val field = new JTextField(initialVal)
val ttip = if (toolTip == null) "Enter a number in the suggested range" else toolTip
field.setToolTipText(ttip)
field.setPreferredSize(new Dimension(50, 20))
field.addKeyListener(new NumberKeyAdapter(field, initialVal))
field
}
def getValue = new ComplexNumber(getRealValue, getImaginaryValue)
private def getRealValue: Double = {
val min = range.point1.real
val max = range.point2.real
getValue(realNumberField, min, max)
}
private def getImaginaryValue: Double = {
val min = range.point1.imaginary
val max = range.point2.imaginary
getValue(imaginaryNumberField, min, max)
}
private def getValue(input: JTextField, min: Double, max: Double): Double = {
val text = input.getText
if (text.length == 0) return 0
val v = text.toDouble
if (v < min) {
input.setText(min.toString)
min
}
else if (v > max) {
input.setText(max.toString)
max
}
else v
}
override def setEnabled(enabled: Boolean): Unit = {
super.setEnabled(enabled)
getNumberField.setEnabled(enabled)
}
override def addKeyListener(keyListener: KeyListener): Unit = {
getNumberField.addKeyListener(keyListener)
}
def setInitialValue(value: ComplexNumber): Unit = {this.initialValue = value}
def setAllowedRange(range: ComplexNumberRange): Unit = {this.range = range}
def getAllowedRange: ComplexNumberRange = range
private def getNumberField = realNumberField
/** Handle number input. Give dynamic feedback if invalid. */
private class NumberKeyAdapter(var field: JTextField, var initialValue: String) extends KeyAdapter {
override def keyTyped(key: KeyEvent): Unit = {
val c = key.getKeyChar
if (c >= 'A' && c <= 'z') {
JOptionPane.showMessageDialog(null,
"no non-numeric characters allowed!", "Error",
JOptionPane.ERROR_MESSAGE)
// clear the input text since it is in error
realNumberField.setText("")
key.consume() // don't let it get entered
}
else if ((c < '0' || c > '9') && (c != 8) && (c != '.') && (c != '-')) { // 8=backspace
JOptionPane.showMessageDialog(null,
"no non-numeric character (" + c + ") not allowed!", "Error", JOptionPane.ERROR_MESSAGE)
key.consume()
}
val txt = field.getText
if (txt.length > 1) try
txt.toDouble
catch {
case e: NumberFormatException =>
// if an error occurred during parsing then revert to the initial value
field.setText(initialValue)
println("Warning: could not parse " + txt + " as a number. \n" + e.getMessage)
}
}
}
}
