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/** Copyright by Barry G. Becker, 2000-2011. Licensed under MIT License: http://www.opensource.org/licenses/MIT */
package com.barrybecker4.ui.components;
import com.barrybecker4.common.math.ComplexNumber;
import com.barrybecker4.common.math.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.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
/**
* 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.
*
* @author Barry Becker
*/
public class ComplexNumberInput extends JPanel {
/** everything is allowed by default */
private static final ComplexNumberRange DEFAULT_RANGE =
new ComplexNumberRange(new ComplexNumber(-Double.MAX_VALUE, -Double.MAX_VALUE),
new ComplexNumber(Double.MAX_VALUE, Double.MAX_VALUE));
private JTextField realNumberField;
private JTextField imaginaryNumberField;
private ComplexNumber initialValue;
private ComplexNumberRange range;
/**
* 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
*/
public ComplexNumberInput(String labelText) {
this(labelText, new ComplexNumber(0, 0), null, 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.
*/
public ComplexNumberInput(String labelText, ComplexNumber initialValue) {
this( labelText, initialValue, null, 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.
* @param toolTip the tooltip for the whole panel
* @param allowedRange defines a bounding box of allowed numbers that cna be input by the user.
*/
public ComplexNumberInput(String labelText, ComplexNumber initialValue, String toolTip,
ComplexNumberRange allowedRange) {
this.initialValue = initialValue;
setAllowedRange(allowedRange);
realNumberField = createNumberField(initialValue.getReal(), toolTip);
imaginaryNumberField = createNumberField(initialValue.getImaginary(), toolTip);
setLayout(new BorderLayout());
setAlignmentX( Component.LEFT_ALIGNMENT );
JLabel label = new JLabel( labelText );
add( label, BorderLayout.WEST );
JPanel numPanel = new JPanel();
numPanel.setBorder(BorderFactory.createEmptyBorder(0, 2, 0, 2));
numPanel.add(realNumberField);
numPanel.add(imaginaryNumberField);
add(numPanel, BorderLayout.EAST);
setToolTipText(toolTip != null ? toolTip : labelText);
}
private JTextField createNumberField(double initialValue, String toolTip) {
String initialVal = Double.toString(initialValue);
JTextField field = new JTextField(initialVal);
if (toolTip == null) {
field.setToolTipText( "enter a number in the suggested range" );
}
else {
field.setToolTipText( toolTip );
}
field.setPreferredSize(new Dimension(50, 20));
field.addKeyListener(new NumberKeyAdapter(field, initialVal));
return field;
}
public ComplexNumber getValue() {
return new ComplexNumber(getRealValue(), getImaginaryValue());
}
private double getRealValue() {
String text = realNumberField.getText();
if (text.length() == 0) {
return 0;
}
double v = Double.parseDouble(text);
double min = range.getPoint1().getReal();
double max = range.getPoint2().getReal();
if (v < min) {
realNumberField.setText("" + min);
v = min;
}
else if (v > max) {
realNumberField.setText("" + max);
v = max;
}
return v;
}
private double getImaginaryValue() {
String text = imaginaryNumberField.getText();
if (text.length() == 0) {
return 0;
}
double v = Double.parseDouble(text);
double min = range.getPoint1().getImaginary();
double max = range.getPoint2().getImaginary();
if (v < min) {
imaginaryNumberField.setText("" + min);
v = min;
}
else if (v > max) {
imaginaryNumberField.setText("" + max);
v = max;
}
return v;
}
@Override
public void setEnabled(boolean enabled) {
super.setEnabled(enabled);
getNumberField().setEnabled(enabled);
}
private JTextField getNumberField() {
return realNumberField;
}
@Override
public synchronized void addKeyListener(KeyListener keyListener) {
getNumberField().addKeyListener(keyListener);
}
public void setInitialValue(ComplexNumber value) {
this.initialValue = value;
}
public void setAllowedRange(ComplexNumberRange range) {
this.range = range;
}
public ComplexNumberRange getAllowedRange() {
return range;
}
/**
* Handle number input. Give dynamic feedback if invalid.
*/
private class NumberKeyAdapter extends KeyAdapter {
JTextField field;
String initialValue;
public NumberKeyAdapter(final JTextField field, final String initialValue) {
this.field = field;
this.initialValue = initialValue;
}
@Override
public void keyTyped( KeyEvent key ) {
char 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(); // don't let it get entered
}
String txt = field.getText();
if (txt.length() > 1) {
try {
Double.parseDouble(txt);
} catch (NumberFormatException e) {
// if an error occurred during parsing then revert to the initial value
field.setText(initialValue);
System.out.println("Warning: could not parse " + txt + " as a number. \n"
+ e.getMessage());
}
}
}
}
}
