SwingCodeExamplesNB as a Maven Netbeans Project

SwingCodeExamplesNB/src/main/java/javateaching/leanconsole/LeanConsoleWithInput.java

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+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package javateaching.leanconsole;
+
+import java.awt.BorderLayout;
+import java.awt.event.KeyEvent;
+import java.awt.event.KeyListener;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import javax.swing.JPanel;
+import javax.swing.JScrollPane;
+import javax.swing.JTextArea;
+import javax.swing.JTextField;
+
+/**
+ *
+ * @author paul
+ */
+public class LeanConsoleWithInput extends JPanel
+{
+    private JTextArea textarea = new JTextArea();
+    private JTextField inputfield = new JTextField();
+    
+    private boolean returnPressed = false;
+    
+    public LeanConsoleWithInput()
+    {
+        this.setLayout(new BorderLayout());
+        JScrollPane scroll = new JScrollPane(textarea);
+        this.add(scroll,BorderLayout.CENTER);
+        textarea.setLineWrap(true); // otherwise everything is on one line
+        textarea.setEditable(false); // otherwise people can type over the text
+        // add input field at bottom
+        this.add(inputfield,BorderLayout.SOUTH);
+        inputfield.addKeyListener(new KeyListener(){
+            @Override
+            public void keyTyped(KeyEvent e) {}
+
+            @Override
+            public void keyPressed(KeyEvent e) {}
+
+            @Override
+            public void keyReleased(KeyEvent e) {
+                // while it might seem more natural to hook keyTyped,
+                // apparently getKeyCode only returns values for
+                // keyPressed and keyReleased.
+                if (e.getKeyCode() == KeyEvent.VK_ENTER) returnPressed = true;
+            }        
+        });
+    }
+    
+    public void print(String text)
+    {
+        String currentText = this.getTextarea().getText();
+        currentText += text;
+        this.getTextarea().setText(currentText);
+        this.getTextarea().setCaretPosition(this.getTextarea().getDocument().getLength());
+    }
+    
+    public void println(String text)
+    {
+        this.print(text+System.getProperty("line.separator"));
+    }
+    
+    public String readln()
+    {
+        // clear any existing text
+        inputfield.setText("");
+        // put the cursor in the input field
+        inputfield.requestFocusInWindow();
+        this.returnPressed = false;
+        
+        // returnPressed is going to get set when the
+        // user presses return on the KeyListener for
+        // the input field. We wait until it is...
+        while (!this.returnPressed)
+        {
+            // add in a brief pause to processing. Otherwise this loop would
+            // peg the CPU at 100%
+            try { Thread.sleep(200); } catch (InterruptedException ex) {}
+        }
+        String result = inputfield.getText();
+        // we've pressed return, so clear the field
+        inputfield.setText("");
+        this.returnPressed = false;
+        return result;        
+    }
+    
+    public void clear()
+    {
+        this.getTextarea().setText("");
+    }
+
+    public JTextArea getTextarea() {
+        return textarea;
+    }   
+}
+