package Lect39GUIs;

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

public class SwingOptionPaneReplacement2 {
	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) {
		Box verBox = Box.createVerticalBox();
	
		Box horBox = Box.createHorizontalBox();
		ImageIcon imageIcon = new ImageIcon("Lect39GUIs/questionmark.gif");
		JLabel pic = new JLabel(imageIcon);
		horBox.add(Box.createHorizontalStrut(20));
		horBox.add(pic);
		horBox.add(Box.createHorizontalStrut(20));

		Box verBox2 = Box.createVerticalBox();
		JLabel label = new JLabel(labelText);
		verBox2.add(label);
		verBox2.add(Box.createVerticalStrut(5));
		JTextField textField = new JTextField();
		textField.setPreferredSize(new Dimension(200, 20));
		verBox2.add(textField);
		horBox.add(verBox2);
		horBox.add(Box.createHorizontalStrut(10));
		verBox.add(Box.createVerticalStrut(10));
		verBox.add(horBox);
		
		Box horBox2 = Box.createHorizontalBox();
		horBox2.add(Box.createHorizontalGlue());
		JButton okButton = new JButton("OK");
		horBox2.add(okButton);
		horBox2.add(Box.createHorizontalStrut(10));
		JButton cancelButton = new JButton("Cancel");
		horBox2.add(cancelButton);
		horBox2.add(Box.createHorizontalGlue());
		verBox.add(Box.createVerticalStrut(10));
		verBox.add(horBox2);
		verBox.add(Box.createVerticalStrut(10));
		
		OptionPaneOKListener okListener = new OptionPaneOKListener(frame);
		okButton.addActionListener(okListener);
		textField.addKeyListener(okListener);
		cancelButton.addActionListener(new OptionPaneCancelListener(frame, textField));

		frame.setContentPane(verBox);
		
		return textField;
	}
	
	static private void displayFrame(JFrame frame) {
		frame.setLocation(100, 100);
		frame.pack();
		frame.show();		
	}
	
	static public void main(String[] args) {
//		JOptionPane.showInputDialog("Enter some text:");
		String result = SwingOptionPaneReplacement2.showInputDialog("Enter some text:");
		System.out.println("You entered: " + result);
	}
}

class OptionPaneCancelListener implements ActionListener {
	private JFrame frame;
	private JTextField textField;
	
	public OptionPaneCancelListener(JFrame frame, JTextField textField) {
		this.frame = frame;
		this.textField = textField;
	}
	
	public void actionPerformed(ActionEvent e) {
		synchronized (frame) {
			textField.setText("");
			frame.notifyAll();
		}
	}	
}