Tried to setup composition code.

ComposeWindow.java

@@ -2,11 +2,15 @@
 import javax.swing.JFrame;
 import javax.swing.JPanel;
 import javax.swing.JTextArea;
+import javax.swing.JComboBox;
 import javax.swing.JButton;
 import javax.swing.Box;
 import javax.swing.BorderFactory;
 import java.awt.BorderLayout;
 import java.awt.Dimension;
+import java.awt.event.ActionListener;
+import java.awt.event.ActionEvent;
+import java.awt.Cursor;
 
 class
 ComposeWindow extends JFrame {
@@ -14,8 +18,6 @@ ComposeWindow extends JFrame {
     private Composition
     composition;
 
-//   -  -%-  -
-
     private ComposeComponent
     display;
 
@@ -23,30 +25,74 @@ ComposeWindow extends JFrame {
 
     private static final Composition
     NULL_COMPOSITION = new Composition();
+
     {
         NULL_COMPOSITION.text = "This is a sample composition..!";
         NULL_COMPOSITION.visibility = PostVisibility.PUBLIC;
         NULL_COMPOSITION.replyToPostId = null;
+        // Static final does not like structs very much..
     }
 
 //  ---%-@-%---
 
     public void
-    setComposition(Composition composition)
+    startNewPost()
+    {
+        composition = new Composition();
+        composition.text = "";
+        composition.visibility = PostVisibility.PUBLIC;
+        composition.replyToPostId = null;
+    }
+
+    public void
+    startReply(String postId)
+    {
+        composition = new Composition();
+        composition.text = "";
+        composition.visibility = PostVisibility.PUBLIC;
+        composition.replyToPostId = postId;
+    }
+
+    public void
+    submit()
     {
         assert composition != null;
-        this.composition = composition;
+
+        composition.text = display.getText();
+
+        String visibility = display.getSelectedVisibility();
+        if (visibility.equals("Public"))
+            composition.visibility = PostVisibility.PUBLIC;
+        else if (visibility.equals("Local"))
+            composition.visibility = PostVisibility.LOCAL;
+        else if (visibility.equals("Followers"))
+            composition.visibility = PostVisibility.FOLLOWERS;
+        else if (visibility.equals("Mentioned"))
+            composition.visibility = PostVisibility.MENTIONED;
+        else
+            assert false;
+
+        display.match(composition); // (For good measure)
+
+        display.setEnabled(false);
+        // Perform fancy submission
+        display.setEnabled(true);
+        // (悪) Are we going to block the EDT?
     }
 
 //  ---%-@-%---
 
     ComposeWindow()
     {
+        //startNewPost();
+        composition = NULL_COMPOSITION;
+
         getContentPane().setPreferredSize(new Dimension(360, 270));
         pack();
         setDefaultCloseOperation(DISPOSE_ON_CLOSE);
 
-        display = new ComposeComponent();
+        display = new ComposeComponent(this);
+        display.match(composition);
 
         setContentPane(display);
     }
@@ -56,24 +102,102 @@ ComposeWindow extends JFrame {
 
 
 class
-ComposeComponent extends JPanel {
+ComposeComponent extends JPanel
+implements ActionListener {
+
+    private ComposeWindow
+    primaire;
+
+//   -  -%-  -
 
     private JTextArea
     text;
 
+    private JComboBox<String>
+    visibility;
+
     private JButton
     submit;
 
 //  ---%-@-%---
 
-    ComposeComponent()
+    public void
+    match(Composition composition)
     {
+        text.setText(composition.text);
+
+        switch (composition.visibility)
+        {
+            case PUBLIC:
+                visibility.setSelectedIndex(0);
+                break;
+            case LOCAL:
+                visibility.setSelectedIndex(1);
+                break;
+            case FOLLOWERS:
+                visibility.setSelectedIndex(2);
+                break;
+            case MENTIONED:
+                visibility.setSelectedIndex(3);
+                break;
+        }
+
+        // And we haven't implemented the reply indicator yet.
+    }
+
+    public String
+    getText() { return text.getText(); }
+
+    public String
+    getSelectedVisibility()
+    {
+        return (String)visibility.getSelectedItem();
+    }
+
+    public void
+    setEnabled(boolean enabled)
+    {
+        text.setEnabled(enabled);
+        visibility.setEnabled(enabled);
+        submit.setEnabled(enabled);
+
+        // If we're disabled, presumably it's because we are
+        // waiting for an existing submission to complete.
+        setCursor(
+            !enabled
+                ? Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR)
+                : null
+        );
+    }
+
+    public void
+    actionPerformed(ActionEvent eA) { primaire.submit(); }
+
+//  ---%-@-%---
+
+    ComposeComponent(ComposeWindow primaire)
+    {
+        this.primaire = primaire;
+
         text = new JTextArea();
 
+        visibility = new JComboBox<>(new String[] {
+            "Public",
+            "Local",
+            "Followers",
+            "Mentioned"
+            // This might be hard to localise.. And, should we
+            // save the strings in the enum instead?
+        });
+        visibility.setPreferredSize(new Dimension(64, 24));
+
         submit = new JButton("Submit");
+        submit.addActionListener(this);
 
         Box bottom = Box.createHorizontalBox();
         bottom.add(Box.createGlue());
+        bottom.add(visibility);
+        bottom.add(Box.createHorizontalStrut(8));
         bottom.add(submit);
 
         setLayout(new BorderLayout(0, 8));