package Lect39GUIs;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class SwingOptionPaneReplacement1 {
	static synchronized public String showInputDialog(String labelText) {
		JFrame frame = buildFrame();
		JTextField textField = buildGUI(frame, labelText);
		displayFrame(frame);
		
		// This is a fancy way of saying stop execution until frame.notify() is called elsewhere
		// That happens when the user clicks on the OK button
		synchronized (frame) {
			try {
				frame.wait();
			} catch (InterruptedException e) {}
		}
		
		// User has clicked on OK button, so get rid of window and return string
		frame.hide();
		frame.dispose();
		
		return textField.getText();
	}
	
	static private JFrame buildFrame() {
		try {
			UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
		} catch (Exception e) {}
		
		// Create a top-level window to put the picture in
		JFrame frame;
		frame = new JFrame("Swing Example");
		frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
		
		return frame;
	}
	
	static private JTextField buildGUI(JFrame frame, String labelText) {
		JPanel panel = new JPanel();
		panel.setBackground(Color.WHITE);
		panel.setLayout(new BorderLayout());
	
		JLabel label = new JLabel(labelText);
		panel.add(label, BorderLayout.NORTH);

		JTextField textField = new JTextField();
		panel.add(textField, BorderLayout.CENTER);
		
		JButton okButton = new JButton("OK");
		panel.add(okButton, BorderLayout.SOUTH);
		
		OptionPaneOKListener okListener = new OptionPaneOKListener(frame);
		okButton.addActionListener(okListener);
		textField.addKeyListener(okListener);

		frame.setContentPane(panel);
		
		return textField;
	}
	
	static private void displayFrame(JFrame frame) {
		frame.setLocation(100, 100);
		frame.pack();
		frame.show();		
	}
	
	static public void main(String[] args) {
		String result = SwingOptionPaneReplacement1.showInputDialog("Enter some text:");
		System.out.println("You entered: " + result);
	}
}

class OptionPaneOKListener implements ActionListener, KeyListener {
	private JFrame frame;
	
	public OptionPaneOKListener(JFrame frame) {
		this.frame = frame;
	}
	
	public void actionPerformed(ActionEvent e) {
		okAction();
	}

	public void keyPressed(KeyEvent e) {
		if (e.getKeyCode() == KeyEvent.VK_ENTER) {
			okAction();
		}
	}

	public void keyReleased(KeyEvent e) {
	}
	
	public void keyTyped(KeyEvent e) {
	}
	
	private void okAction() {
		synchronized (frame) {
			frame.notifyAll();
		}		
	}
}