import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JComponent;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JSeparator;
import javax.swing.Box;
import javax.swing.BorderFactory;
import java.awt.BorderLayout;
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.Dimension;
import java.awt.Insets;
import java.util.List;
import java.util.ArrayList;

class
TimelineWindow extends JFrame {

    private Timeline
    timeline;

//   -  -%-  -

    private TimelineComponent
    display;

//  ---%-@-%---

    public void
    setTimeline(Timeline timeline)
    {
        assert timeline != null;
        this.timeline = timeline;
    }

//  ---%-@-%---

    TimelineWindow()
    {
        getContentPane().setPreferredSize(new Dimension(300, 400));
        pack();
        setDefaultCloseOperation(DISPOSE_ON_CLOSE);

        JMenu programMenu = new JMenu("Program");
        programMenu.add("Open home timeline");
        programMenu.add("Open messages timeline");
        programMenu.add("Open local timeline");
        programMenu.add("Open federated timeline");
        programMenu.add(new JSeparator());
        programMenu.add("Create a post");
        programMenu.add("Open auto post view");
        programMenu.add(new JSeparator());
        programMenu.add("Quit");
        JMenu timelineMenu = new JMenu("Timeline");
        timelineMenu.add("Flip to newest post");
        JMenuBar menuBar = new JMenuBar();
        menuBar.add(programMenu);
        menuBar.add(timelineMenu);
        setJMenuBar(menuBar);

        display = new TimelineComponent();

        setContentPane(display);
    }

}



class
TimelineComponent extends JPanel {

    private JButton
    next, prev;

    private JLabel
    pageLabel;

    private final List<PostPreviewComponent>
    postPreviews = new ArrayList<>();

//  ---%-@-%---

    TimelineComponent()
    {
        prev = new JButton("<");
        next = new JButton(">");

        Box bottom = Box.createHorizontalBox();
        bottom.add(Box.createGlue());
        bottom.add(prev);
        bottom.add(Box.createHorizontalStrut(8));
        bottom.add(next);

        JPanel centre = new JPanel();
        centre.setOpaque(false);
        centre.setLayout(new GridBagLayout());
        GridBagConstraints constraints = new GridBagConstraints();
        constraints.fill = GridBagConstraints.HORIZONTAL;
        constraints.gridx = 0;
        constraints.weightx = 1;
        constraints.insets = new Insets(4, 0, 4, 0);
        for (int n = 8; n > 0; --n)
        {
            PostPreviewComponent p = new PostPreviewComponent();
            centre.add(p, constraints);
            postPreviews.add(p);
        }

        setLayout(new BorderLayout());
        add(centre, BorderLayout.CENTER);
        add(bottom, BorderLayout.SOUTH);

        setBorder(BorderFactory.createEmptyBorder(8, 8, 8, 8));
    }

}



class
PostPreviewComponent extends JComponent {

    private JLabel
    topLeft, topRight, bottom;

//  ---%-@-%---

    public void
    setTopLeft(String text) { topLeft.setText(text); }

    public void
    setTopRight(String text) { topRight.setText(text); }

    public void
    setBottom(String text) { bottom.setText(text); }

//  ---%-@-%---

    public
    PostPreviewComponent()
    {
        Font font;

        topLeft = new JLabel("Top left");
        font = topLeft.getFont();
        topLeft.setFont(font.deriveFont(Font.PLAIN, 12f));
        setOpaque(false);

        topRight = new JLabel("Top right");
        topRight.setHorizontalAlignment(JLabel.RIGHT);
        font = topRight.getFont();
        topRight.setFont(font.deriveFont(Font.ITALIC, 12f));
        setOpaque(false);

        bottom = new JLabel("Bottom");
        font = bottom.getFont();
        bottom.setFont(font.deriveFont(Font.PLAIN, 16f));
        bottom.setOpaque(false);

        Box top = Box.createHorizontalBox();
        top.add(topLeft);
        top.add(Box.createGlue());
        top.add(topRight);

        setLayout(new BorderLayout());
        add(top, BorderLayout.NORTH);
        add(bottom, BorderLayout.SOUTH);
    }

}