src/org/math/plot/ParametersPanel.java

package org.math.plot;

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;

public class ParametersPanel extends JPanel implements ActionListener {

        private static final long serialVersionUID = 1L;

        private Dimension defaultSize;

        private String[] paramLabels;

        private String[] paramValues;

        private boolean[] isList;

        private int[] paramValuesIndex;

        private String[][] paramChoices;

        private JLabel[] labels;

        private JComboBox[] fields;

        private Runnable action;

        public ParametersPanel(String[] lab, String[] val) {
                this(lab, new int[lab.length], new String[][] { val });
        }

        public ParametersPanel(String[] lab) {
                this(lab, new String[lab.length]);
        }

        public ParametersPanel(String[] lab, int[] selected, String[][] ch) {
                paramLabels = lab;

                isList = new boolean[paramLabels.length];
                for (int i = 0; i < isList.length; i++) {
                        isList[i] = true;
                }

                paramValuesIndex = selected;

                paramChoices = ch;

                paramValues = new String[paramLabels.length];
                for (int i = 0; i < paramChoices.length; i++) {
                        paramValues[i] = paramChoices[i][paramValuesIndex[i]];
                }

                setComponents();
                setAppearence();
                draw();
        }

        public ParametersPanel(String[] lab, String[][] ch) {
                this(lab, new int[lab.length], ch);
        }

        private void setComponents() {
                labels = new JLabel[paramLabels.length];
                fields = new JComboBox[paramLabels.length];
                for (int i = 0; i < paramLabels.length; i++) {
                        labels[i] = new JLabel(paramLabels[i], JLabel.RIGHT);
                        if (isList[i]) {
                                fields[i] = new JComboBox(paramChoices[i]);
                        } else {
                                fields[i] = new JComboBox();
                        }
                        fields[i].setEditable(!isList[i]);
                }
                defaultSize = new Dimension(400, paramLabels.length * 30);
        }

        private void setAppearence() {
                setPreferredSize(defaultSize);
                setSize(defaultSize);
        }

        private void update() {
                updateValues();
                updateValuesIndex();
        }

        private void updateValues() {
                for (int i = 0; i < paramLabels.length; i++) {
                        paramValues[i] = (String) (fields[i].getSelectedItem());
                }
        }

        private void updateValuesIndex() {
                for (int i = 0; i < paramLabels.length; i++) {
                        if (isList[i]) {
                                paramValuesIndex[i] = fields[i].getSelectedIndex();
                        }
                }
        }

        public void actionPerformed(ActionEvent e) {
                update();
                new Thread(action, "PanelParameters " + this.toString() + " selection").start();
        }

        public int getValueIndex(int i) {
                if (!isList[i]) {
                        throw new IllegalArgumentException("This PanelParameter element is not set to give an Index.");
                }
                update();
                return paramValuesIndex[i];
        }

        public int[] getValuesIndex() {
                update();
                return paramValuesIndex;
        }

        public String[] getValues() {
                update();
                return paramValues;
        }

        public String getValue(int i) {
                update();
                return paramValues[i];
        }

        public void setAction(Runnable t) {
                action = t;
        }

        private void buildConstraints(GridBagConstraints gbc, int gx, int gy, int gw, int gh, int wx, int wy) {
                gbc.gridx = gx;
                gbc.gridy = gy;
                gbc.gridwidth = gw;
                gbc.gridheight = gh;
                gbc.weightx = wx;
                gbc.weighty = wy;
        }

        private void draw() {
                JPanel panel = new JPanel();

                GridBagLayout gbl = new GridBagLayout();
                GridBagConstraints c = new GridBagConstraints();
                panel.setLayout(gbl);

                for (int i = 0; i < paramLabels.length; i++) {
                        fields[i].addActionListener(this);

                        // Ajout du panel de la chaine
                        buildConstraints(c, 0, i, 1, 1, 50, 20);
                        c.anchor = GridBagConstraints.EAST;
                        gbl.setConstraints(labels[i], c);
                        panel.add(labels[i]);

                        // Ajout du panel de la chaine
                        buildConstraints(c, 1, i, 1, 1, 50, 20);
                        c.fill = GridBagConstraints.HORIZONTAL;
                        gbl.setConstraints(fields[i], c);
                        panel.add(fields[i]);
                }

                JScrollPane scrollPane = new JScrollPane(panel);

                scrollPane.setPreferredSize(getSize());
                scrollPane.setSize(getSize());

                setLayout(new BorderLayout());
                add(scrollPane, BorderLayout.CENTER);

        }

}

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