Adds unfinished code showing the idea of how dockable tabs are supposed to be implemented

src/main/java/net/knarcraft/minecraftserverlauncher/userinterface/JDockableTabbedPane.java

@@ -0,0 +1,35 @@
+package net.knarcraft.minecraftserverlauncher.userinterface;
+
+import javax.swing.*;
+
+/**
+ * An extended JTabbedPane with dockable tabs
+ */
+public class JDockableTabbedPane extends JTabbedPane {
+
+    private String tabbedPaneId;
+
+    public JDockableTabbedPane(String tabbedPaneId) {
+        super();
+        this.tabbedPaneId = tabbedPaneId;
+    }
+
+    public JDockableTabbedPane(String tabbedPaneId, int tabPlacement) {
+        super(tabPlacement);
+        this.tabbedPaneId = tabbedPaneId;
+    }
+
+    public JDockableTabbedPane(String tabbedPaneId, int tabPlacement, int tabLayoutPolicy) {
+        super(tabPlacement, tabLayoutPolicy);
+        this.tabbedPaneId = tabbedPaneId;
+    }
+
+    /**
+     * Gets the id of this tabbed pane
+     * @return <p>The id of this tabbed pane</p>
+     */
+    public String getTabbedPaneId() {
+        return tabbedPaneId;
+    }
+
+}

src/main/java/net/knarcraft/minecraftserverlauncher/userinterface/TabDragListener.java

@@ -0,0 +1,61 @@
+package net.knarcraft.minecraftserverlauncher.userinterface;
+
+import javax.swing.event.MouseInputAdapter;
+import java.awt.*;
+import java.awt.event.MouseEvent;
+
+/**
+ * A listener for detecting the dragging of a tab to make it dock or undock
+ */
+public class TabDragListener extends MouseInputAdapter {
+
+    Point dragStartPoint;
+    Component draggedComponent;
+    String draggedTabTitle;
+    JDockableTabbedPane tabbedPaneToListenTo;
+
+    public TabDragListener(JDockableTabbedPane tabbedPaneToListenTo) {
+        this.tabbedPaneToListenTo = tabbedPaneToListenTo;
+    }
+
+    @Override
+    public void mousePressed(MouseEvent e) {
+        dragStartPoint = e.getPoint();
+
+        //Loop through tabbed panes to find the dragged one
+        for (int i = 0; i < tabbedPaneToListenTo.getTabCount(); i++) {
+            Rectangle bounds = tabbedPaneToListenTo.getBoundsAt(i);
+            if (bounds.contains(dragStartPoint)) {
+                draggedComponent = tabbedPaneToListenTo.getComponentAt(i);
+                draggedTabTitle = tabbedPaneToListenTo.getTitleAt(i);
+                break;
+            }
+        }
+    }
+
+    @Override
+    public void mouseDragged(MouseEvent e) {
+        Point dragEndPoint = e.getPoint();
+        if (draggedComponent != null) {
+            // check for a significant  drag
+            //TODO: Check if tab is dragged onto another JDockableTabbedPane with the same id
+            if (Math.abs(dragEndPoint.getY() - dragStartPoint.getY()) > 30) {
+
+                //TODO: Undock by creating a new JDockableTabbedPane with the same id
+                //TODO: If dragging onto another JDockableTabbedPane with the same id, combine
+                //TODO: Make the listener keep track of all its created windows
+                //TODO: If a child window is closed, dock its tab to the main window
+                //TODO: Keep track of the original window vs. the child window
+                //undock(draggedComponent, draggedTabTitle);
+                draggedComponent = null;
+            }
+        }
+    }
+
+    @Override
+    public void mouseReleased(MouseEvent arg0) {
+        draggedComponent = null;
+        draggedTabTitle = null;
+    }
+
+}