biskuteri-cafe-JKomasto2/TimelineWindow.java

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.JMenuItem;
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;
import java.util.Deque;
import java.util.LinkedList;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

class
TimelineWindow extends JFrame
implements ActionListener {

    private Timeline
    timeline;

//   -  -%-  -

    private TimelineComponent
    display;

    private JMenuItem
    openHome,
    // umm, what about the timeline that's like, notes that your
    // post was favourited or replied to? those aren't messages..
    openMessages,
    openLocal,
    openFederated,
    createPost,
    openAutoPostView,
    quit;

    private JMenuItem
    flipToNewestPost;

    private Deque<Deque<String>>
    postIDsSeen;

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

    public void
    setTimeline(Timeline timeline)
    {
        if (timeline == null)
        {
            timeline = new Timeline();
            timeline.type = TimelineType.LOCAL;
        }

        assert timeline != null;
        this.timeline = timeline;

        // Here, we should request for posts for the timeline.
        // And pass data to TimelineComponent.
    }

    public void
    nextPage()
    {
        /*
        * uhh, what if the ID we provide is invalid.
        * Or does Mastodon keep IDs as 'deleted'? That
        * would make things a lot simpler.
        */
    }

    public void
    previousPage()
    {
        if (postIDsSeen.isEmpty())
        {
            // Just request the latest first page.
            return;
        }

        Deque<String> lastPagePostIDs = postIDsSeen.pop();

        while (!lastPagePostIDs.isEmpty())
        {
            String idToTry = lastPagePostIDs.pop();

            // Fetch page for this ID.
            // If successful, render and return.
        }

        // Didn't return from above. Our current page "replaced"
        // the previous page, so the previous page's predecessor
        // is our previous page. Try to flip to that.
        previousPage();
    }

//   -  -%-  -

    public void
    actionPerformed(ActionEvent eA)
    {
        Object src = eA.getSource();

        if (src == quit)
        {
            /*
            * Umm.. should we even have a quit option?
            * Wouldn't closing every window work? By
            * disposing of everyone. We won't be having any
            * background threads IIRC (and they can check
            * if the Swing thread is alive).
            */
        }
    }

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

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

        openHome = new JMenuItem("Open home timeline");
        openFederated = new JMenuItem("Open federated timeline");
        createPost = new JMenuItem("Create a post");
        openAutoPostView = new JMenuItem("Open auto post view");
        quit = new JMenuItem("Quit");
        openHome.addActionListener(this);
        openFederated.addActionListener(this);
        createPost.addActionListener(this);
        openAutoPostView.addActionListener(this);
        quit.addActionListener(this);

        flipToNewestPost = new JMenuItem("Flip to newest post");
        flipToNewestPost.addActionListener(this);

        JMenu programMenu = new JMenu("Program");
        programMenu.add(openHome);
        programMenu.add(openFederated);
        programMenu.add(new JSeparator());
        programMenu.add(createPost);
        programMenu.add(openAutoPostView);
        programMenu.add(new JSeparator());
        programMenu.add(quit);
        JMenu timelineMenu = new JMenu("Timeline");
        timelineMenu.add(flipToNewestPost);
        JMenuBar menuBar = new JMenuBar();
        menuBar.add(programMenu);
        menuBar.add(timelineMenu);
        setJMenuBar(menuBar);

        display = new TimelineComponent(this);

        setContentPane(display);
    }

}



class
TimelineComponent extends JPanel
implements ActionListener {

    private TimelineWindow
    primaire;

    private final List<Post>
    posts = new ArrayList<>();

//   -  -%-  -

    private JButton
    next, prev;

    private JLabel
    pageLabel;

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

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

    public void
    setPosts(List<Post> posts)
    {
        if (posts == null)
        {
            posts = new ArrayList<>();
            // Insert sample timeline posts here
        }

        this.posts.clear();
        this.posts.addAll(posts);
        syncPreviewsToPosts();
    }

    public void
    setPageLabel(String label)
    {
        assert label != null;
        pageLabel.setText("" + label);
    }

    public void
    setNextPageAvailable(boolean available)
    {
        next.setEnabled(available);
    }

    public void
    setPreviousPageAvailable(boolean available)
    {
        prev.setEnabled(available);
    }

//   -  -%-  -

    private void
    syncPreviewsToPosts()
    {
        for (PostPreviewComponent p: postPreviews)
        {
            p.setTopLeft("Top left");
            p.setTopRight("Top right");
            p.setBottom("Bottom");
            // (In reality we are supposed to map with posts)
        }
    }

    public void
    actionPerformed(ActionEvent eA)
    {
        Object src = eA.getSource();

        if (src == next) primaire.nextPage();
        else if (src == prev) primaire.previousPage();
        /*
        * I think the page previews will just forward to us.
        * But I think they'll have to tell us where they are
        * in the list somehow, because we need to show only
        * one post as selected.
        */
    }

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

    TimelineComponent(TimelineWindow primaire)
    {
        this.primaire = primaire;

        prev = new JButton("<");
        next = new JButton(">");
        prev.setEnabled(false);
        next.setEnabled(false);

        pageLabel = new JLabel("0");

        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));

        setPosts(null);
    }

}



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();
        font = topLeft.getFont();
        topLeft.setFont(font.deriveFont(Font.PLAIN, 12f));
        setOpaque(false);

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

        bottom = new JLabel();
        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);
    }

}