Add serial input text field to plotter

app/src/processing/app/SerialPlotter.java

@@ -26,8 +26,12 @@
 import java.util.ArrayList;
 import javax.swing.*;
 import javax.swing.border.EmptyBorder;
+import javax.swing.text.DefaultEditorKit;
 import java.awt.*;
+import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
+import java.awt.event.WindowAdapter;
+import java.awt.event.WindowEvent;
 import java.awt.geom.AffineTransform;
 import java.awt.geom.Rectangle2D;
 
@@ -40,6 +44,11 @@ public class SerialPlotter extends AbstractMonitor {
   private Serial serial;
   private int serialRate, xCount;
 
+  private JLabel noLineEndingAlert;
+  private JTextField textField;
+  private JButton sendButton;
+  private JComboBox<String> lineEndings;
+
   private ArrayList<Graph> graphs;
   private final static int BUFFER_CAPACITY = 500;
 
@@ -254,10 +263,113 @@ protected void onCreateWindow(Container mainPane) {
     pane.add(serialRates);
 
     mainPane.add(pane, BorderLayout.SOUTH);
+
+    textField = new JTextField(40);
+    // textField is selected every time the window is focused
+    addWindowFocusListener(new WindowAdapter() {
+      @Override
+      public void windowGainedFocus(WindowEvent e) {
+        textField.requestFocusInWindow();
+      }
+    });
+
+    // Add cut/copy/paste contextual menu to the text input field.
+    JPopupMenu menu = new JPopupMenu();
+
+    Action cut = new DefaultEditorKit.CutAction();
+    cut.putValue(Action.NAME, tr("Cut"));
+    menu.add(cut);
+
+    Action copy = new DefaultEditorKit.CopyAction();
+    copy.putValue(Action.NAME, tr("Copy"));
+    menu.add(copy);
+
+    Action paste = new DefaultEditorKit.PasteAction();
+    paste.putValue(Action.NAME, tr("Paste"));
+    menu.add(paste);
+
+    textField.setComponentPopupMenu(menu);
+
+    sendButton = new JButton(tr("Send"));
+
+    JPanel lowerPane = new JPanel();
+    lowerPane.setLayout(new BoxLayout(lowerPane, BoxLayout.X_AXIS));
+    lowerPane.setBorder(new EmptyBorder(4, 4, 4, 4));
+
+    noLineEndingAlert = new JLabel(I18n.format(tr("You've pressed {0} but nothing was sent. Should you select a line ending?"), tr("Send")));
+    noLineEndingAlert.setToolTipText(noLineEndingAlert.getText());
+    noLineEndingAlert.setForeground(pane.getBackground());
+    Dimension minimumSize = new Dimension(noLineEndingAlert.getMinimumSize());
+    minimumSize.setSize(minimumSize.getWidth() / 3, minimumSize.getHeight());
+    noLineEndingAlert.setMinimumSize(minimumSize);
+
+
+    lineEndings = new JComboBox<String>(new String[]{tr("No line ending"), tr("Newline"), tr("Carriage return"), tr("Both NL & CR")});
+    lineEndings.addActionListener((ActionEvent event) -> {
+      PreferencesData.setInteger("serial.line_ending", lineEndings.getSelectedIndex());
+      noLineEndingAlert.setForeground(pane.getBackground());
+    });
+    lineEndings.setMaximumSize(lineEndings.getMinimumSize());
+
+    lowerPane.add(textField);
+    lowerPane.add(Box.createRigidArea(new Dimension(4, 0)));
+    lowerPane.add(sendButton);
+
+    pane.add(lowerPane);
+    pane.add(noLineEndingAlert);
+    pane.add(Box.createRigidArea(new Dimension(8, 0)));
+    pane.add(lineEndings);
+
+    applyPreferences();
+
+    onSendCommand((ActionEvent event) -> {
+      send(textField.getText());
+      textField.setText("");
+    });
+
+  }
+
+  private void send(String string) {
+    String s = string;
+    if (serial != null) {
+      switch (lineEndings.getSelectedIndex()) {
+        case 1:
+          s += "\n";
+          break;
+        case 2:
+          s += "\r";
+          break;
+        case 3:
+          s += "\r\n";
+          break;
+        default:
+          break;
+      }
+      if ("".equals(s) && lineEndings.getSelectedIndex() == 0 && !PreferencesData.has("runtime.line.ending.alert.notified")) {
+        noLineEndingAlert.setForeground(Color.RED);
+        PreferencesData.set("runtime.line.ending.alert.notified", "true");
+      }
+      serial.write(s);
+    }
+  }
+
+  public void onSendCommand(ActionListener listener) {
+    textField.addActionListener(listener);
+    sendButton.addActionListener(listener);
+  }
+
+  public void appyPreferences() {
+    // Apply line endings.
+    if (PreferencesData.get("serial.line_ending") != null) {
+      lineEndings.setSelectedIndex(PreferencesData.getInteger("serial.line_ending"));
+    }
   }
 
   protected void onEnableWindow(boolean enable) {
     serialRates.setEnabled(enable);
+    textField.setEnabled(enable);
+    sendButton.setEnabled(enable);
+    lineEndings.setEnabled(enable);
   }
 
   private void onSerialRateChange(ActionListener listener) {