Wednesday, 15 March 2017

Multiple listeners

import java.awt.Container;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Calendar;
import javax.swing.BorderFactory;
import javax.swing.GroupLayout;
import static javax.swing.GroupLayout.Alignment.BASELINE;
import static javax.swing.GroupLayout.DEFAULT_SIZE;
import static javax.swing.GroupLayout.PREFERRED_SIZE;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JSpinner;
import static javax.swing.LayoutStyle.ComponentPlacement.RELATED;
import javax.swing.SpinnerModel;
import javax.swing.SpinnerNumberModel;

public class MultipleListenersEx extends JFrame {

    private JLabel sbar;
    private JSpinner spinner;
    private int count = 0;

    public MultipleListenersEx() {

        initUI();
    }

    private void initUI() {

        sbar = new JLabel("0");
        sbar.setBorder(BorderFactory.createEtchedBorder());

        JButton addBtn = new JButton("+");
        addBtn.addActionListener(new ButtonListener1());
        addBtn.addActionListener(new ButtonListener2());

        Calendar calendar = Calendar.getInstance();
        int currentYear = calendar.get(Calendar.YEAR);

        SpinnerModel yearModel = new SpinnerNumberModel(currentYear,
                currentYear - 100,
                currentYear + 100,
                1);

        spinner = new JSpinner(yearModel);
        spinner.setEditor(new JSpinner.NumberEditor(spinner, "#"));

        createLayout(addBtn, spinner, sbar);

        setTitle("Multiple Listeners");
        setLocationRelativeTo(null);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
    }

    private void createLayout(JComponent... arg) {

        Container pane = getContentPane();
        GroupLayout gl = new GroupLayout(pane);
        pane.setLayout(gl);

        gl.setAutoCreateContainerGaps(true);

        gl.setHorizontalGroup(gl.createParallelGroup()
                .addGroup(gl.createSequentialGroup()
                        .addComponent(arg[0])
                        .addGap(20)
                        .addComponent(arg[1], DEFAULT_SIZE,
                                DEFAULT_SIZE, PREFERRED_SIZE))
                .addComponent(arg[2], GroupLayout.DEFAULT_SIZE,
                        GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        );

        gl.setVerticalGroup(gl.createSequentialGroup()
                .addGroup(gl.createParallelGroup(BASELINE)
                        .addComponent(arg[0])
                        .addGap(20)
                        .addComponent(arg[1], DEFAULT_SIZE,
                                DEFAULT_SIZE, PREFERRED_SIZE))
                .addPreferredGap(RELATED,
                        GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addComponent(arg[2])
        );

        pack();
    }

    private class ButtonListener1 implements ActionListener {

        @Override
        public void actionPerformed(ActionEvent e) {
            Integer val = (Integer) spinner.getValue();
            spinner.setValue(++val);
        }
    }

    private class ButtonListener2 implements ActionListener {

        @Override
        public void actionPerformed(ActionEvent e) {
            sbar.setText(Integer.toString(++count));
        }
    }

    public static void main(String[] args) {

        EventQueue.invokeLater(() -> {
            MultipleListenersEx ml = new MultipleListenersEx();
            ml.setVisible(true);
        });
    }
}


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