Added right-click context menu to text box

Closes #1

src/main/java/com/rarchives/ripme/ui/ContextMenuMouseListener.java

@@ -0,0 +1,131 @@
+package com.rarchives.ripme.ui;
+
+import java.awt.Toolkit;
+import java.awt.datatransfer.DataFlavor;
+import java.awt.event.ActionEvent;
+import java.awt.event.InputEvent;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+
+import javax.swing.AbstractAction;
+import javax.swing.Action;
+import javax.swing.JPopupMenu;
+import javax.swing.text.JTextComponent;
+
+/**
+ * Listens for mouse events & displays a contextual pop-up menu.
+ * Copied verbatim from http://stackoverflow.com/a/2793959
+ * @author Bozhidar Batsov
+ */
+public class ContextMenuMouseListener extends MouseAdapter {
+    private JPopupMenu popup = new JPopupMenu();
+
+    private Action cutAction;
+    private Action copyAction;
+    private Action pasteAction;
+    private Action undoAction;
+    private Action selectAllAction;
+
+    private JTextComponent textComponent;
+    private String savedString = "";
+    private Actions lastActionSelected;
+
+    private enum Actions { UNDO, CUT, COPY, PASTE, SELECT_ALL };
+
+    @SuppressWarnings("serial")
+    public ContextMenuMouseListener() {
+        undoAction = new AbstractAction("Undo") {
+
+            @Override
+            public void actionPerformed(ActionEvent ae) {
+                textComponent.setText("");
+                textComponent.replaceSelection(savedString);
+
+                lastActionSelected = Actions.UNDO;
+            }
+        };
+
+        popup.add(undoAction);
+        popup.addSeparator();
+
+        cutAction = new AbstractAction("Cut") {
+
+            @Override
+            public void actionPerformed(ActionEvent ae) {
+                lastActionSelected = Actions.CUT;
+                savedString = textComponent.getText();
+                textComponent.cut();
+            }
+        };
+
+        popup.add(cutAction);
+
+        copyAction = new AbstractAction("Copy") {
+
+            @Override
+            public void actionPerformed(ActionEvent ae) {
+                lastActionSelected = Actions.COPY;
+                textComponent.copy();
+            }
+        };
+
+        popup.add(copyAction);
+
+        pasteAction = new AbstractAction("Paste") {
+
+            @Override
+            public void actionPerformed(ActionEvent ae) {
+                lastActionSelected = Actions.PASTE;
+                savedString = textComponent.getText();
+                textComponent.paste();
+            }
+        };
+
+        popup.add(pasteAction);
+        popup.addSeparator();
+
+        selectAllAction = new AbstractAction("Select All") {
+
+            @Override
+            public void actionPerformed(ActionEvent ae) {
+                lastActionSelected = Actions.SELECT_ALL;
+                textComponent.selectAll();
+            }
+        };
+
+        popup.add(selectAllAction);
+    }
+
+    @Override
+    public void mouseClicked(MouseEvent e) {
+        if (e.getModifiers() == InputEvent.BUTTON3_MASK) {
+            if (!(e.getSource() instanceof JTextComponent)) {
+                return;
+            }
+
+            textComponent = (JTextComponent) e.getSource();
+            textComponent.requestFocus();
+
+            boolean enabled = textComponent.isEnabled();
+            boolean editable = textComponent.isEditable();
+            boolean nonempty = !(textComponent.getText() == null || textComponent.getText().equals(""));
+            boolean marked = textComponent.getSelectedText() != null;
+
+            boolean pasteAvailable = Toolkit.getDefaultToolkit().getSystemClipboard().getContents(null).isDataFlavorSupported(DataFlavor.stringFlavor);
+
+            undoAction.setEnabled(enabled && editable && (lastActionSelected == Actions.CUT || lastActionSelected == Actions.PASTE));
+            cutAction.setEnabled(enabled && editable && marked);
+            copyAction.setEnabled(enabled && marked);
+            pasteAction.setEnabled(enabled && editable && pasteAvailable);
+            selectAllAction.setEnabled(enabled && nonempty);
+
+            int nx = e.getX();
+
+            if (nx > 500) {
+                nx = nx - popup.getSize().width;
+            }
+
+            popup.show(e.getComponent(), nx, e.getY() - popup.getSize().height);
+        }
+    }
+}

src/main/java/com/rarchives/ripme/ui/MainWindow.java

@@ -204,6 +204,7 @@ public class MainWindow implements Runnable, RipStatusHandler {
         }
 
         ripTextfield = new JTextField("", 20);
+        ripTextfield.addMouseListener(new ContextMenuMouseListener());
         ImageIcon ripIcon = new ImageIcon(mainIcon);
         ripButton = new JButton("<html><font size=\"5\"><b>Rip</b></font></html>", ripIcon);
         stopButton = new JButton("<html><font size=\"5\"><b>Stop</b></font></html>");