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