/*=========================================================================

  Program:   FusionViewer
  Module:    $RCSfile: WindowLevelDialog.java,v $
  Language:  Java
  Date:      $Date: 2007/02/02 19:27:57 $
  Version:   $Revision: 1.2 $
  
  Copyright (c) Insightful Corporation.  All rights reserved.
  See Copyright.txt for details.
  
  This software is distributed WITHOUT ANY WARRANTY; without even
  the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
  PURPOSE.  See the above copyright notice for more information.

=========================================================================*/

package org.fusionviewer.ui;

import java.awt.Component;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;

import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.KeyStroke;


/**\class WindowLevelDialog
 *\brief Dialog box for entering window and level values.
 */
public class WindowLevelDialog extends JDialog {
	private boolean m_okPressed = false;
	private JTextField m_windowField, m_levelField;
	private Frame m_frame;
	private float m_window, m_level;
	
	/**
	 * Create a dialog box with the indicated owner
	 * 
	 * @param owner parent frame of this dialog box
	 * @param window Display window
	 * @param level window level
	 * @param minValue minimum pixel value
	 * @param maxValue maximum pixel value
	 */
	public WindowLevelDialog(Frame owner, float window, float level, float minValue, float maxValue) {
		super(owner, true);

		m_frame = owner;
		m_window = window;
		m_level = level;
		
		final int BORDER = 10;
		Box panel = Box.createVerticalBox();
		panel.setBorder(BorderFactory.createEmptyBorder(BORDER, BORDER, BORDER, BORDER));
		panel.add(createImageInfo(minValue, maxValue));
		panel.add(Box.createVerticalStrut(5));
		panel.add(createFields(window, level));
		panel.add(Box.createVerticalStrut(10));
		panel.add(createButtons());
		getContentPane().add(panel);
		
		getRootPane().registerKeyboardAction(new DialogCloseButtonListener(false),
				KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0),
				JComponent.WHEN_IN_FOCUSED_WINDOW);
		
		setTitle("Window and Level");
		pack();
		PlatformUtility.centerWindow(this);
	}
	
	/**
	 * Shows the dialog and blocks until the user dismisses it.
	 * 
	 * @return true if the user clicked OK.
	 */
	public boolean run() {
		setVisible(true);		
		return m_okPressed;
	}
	
	/*
	 * Create a panel to show the image minimum and maximum values.
	 */
	private Component createImageInfo(float minValue, float maxValue) {
		JPanel panel = new JPanel();
		panel.setBorder(BorderFactory.createTitledBorder("Image"));
		panel.setLayout(new GridBagLayout());
		
		final int BORDER = 15;
		Insets insets = panel.getInsets();
		insets.left = insets.right = insets.top = insets.bottom = BORDER;
		
		GridBagConstraints constraints = new GridBagConstraints();
		final int INTERNAL_BORDER = 5;
		constraints.insets = new Insets(INTERNAL_BORDER, INTERNAL_BORDER, INTERNAL_BORDER, INTERNAL_BORDER);
		constraints.anchor = GridBagConstraints.LINE_START;
		constraints.fill = GridBagConstraints.NONE;
		constraints.gridx = 0;
		constraints.gridy = 0;
		
		panel.add(new JLabel("Minimum"), constraints);
		constraints.gridy++;
		panel.add(new JLabel("Maximum"), constraints);
		
		constraints.gridy = 0;
		constraints.gridx = 1;
		panel.add(new JLabel(FloatFormatter.formatFloat(minValue)), constraints);
		constraints.gridy++;
		panel.add(new JLabel(FloatFormatter.formatFloat(maxValue)), constraints);
		
		return panel;
	}
	
	/**
	 * @return
	 */
	private Component createFields(float window, float level) {
		JPanel panel = new JPanel();
		panel.setLayout(new GridBagLayout());
		
		final int BORDER = 15;
		panel.setBorder(BorderFactory.createEmptyBorder(BORDER, BORDER, BORDER, BORDER));
		
		final int NUM_COLUMNS = 10;
		m_windowField = new JTextField(FloatFormatter.formatFloat(window), NUM_COLUMNS);
		m_levelField = new JTextField(FloatFormatter.formatFloat(level), NUM_COLUMNS);
		
		GridBagConstraints constraints = new GridBagConstraints();
		final int INTERNAL_BORDER = 5;
		constraints.insets = new Insets(INTERNAL_BORDER, INTERNAL_BORDER, INTERNAL_BORDER, INTERNAL_BORDER);
		constraints.anchor = GridBagConstraints.LINE_START;
		constraints.fill = GridBagConstraints.NONE;
		constraints.gridx = 0;
		constraints.gridy = 0;
		
		panel.add(new JLabel("Window"), constraints);
		constraints.gridy++;
		panel.add(new JLabel("Level"), constraints);
		
		constraints.gridy = 0;
		constraints.gridx = 1;
		panel.add(m_windowField, constraints);
		constraints.gridy++;
		panel.add(m_levelField, constraints);
		
		return panel;
	}
	
	/*
	 * Creates the OK and Cancel buttons.
	 */
	private Component createButtons() {
		JPanel buttonPanel = new JPanel();
		buttonPanel.setLayout(new FlowLayout(FlowLayout.RIGHT));
		
		JButton okBtn = new JButton("Set");
		PlatformUtility.setMnemonic(okBtn, KeyEvent.VK_S);
		okBtn.addActionListener(new DialogCloseButtonListener(true));
		buttonPanel.add(okBtn);
		getRootPane().setDefaultButton(okBtn);

		JButton cancelButton = new JButton("Cancel");
		PlatformUtility.setMnemonic(cancelButton, KeyEvent.VK_C);
		cancelButton.addActionListener(new DialogCloseButtonListener(false));
		buttonPanel.add(cancelButton);

		return buttonPanel;
	}
	
	/**
	 * @return Returns the level.
	 */
	public float getLevel() {
		return m_level;
	}
	
	/**
	 * @return Returns the window.
	 */
	public float getWindow() {
		return m_window;
	}
	
	/*
	 * Listener for the OK and Cancel buttons.
	 */
	private class DialogCloseButtonListener implements ActionListener {
		private boolean m_okValue;

		public DialogCloseButtonListener(boolean okValue) {
			m_okValue = okValue;
		}

		public void actionPerformed(ActionEvent e) {
			m_okPressed = m_okValue;
			
			if (m_okValue) {
				try {
					m_window = Float.parseFloat(m_windowField.getText());
					m_level = Float.parseFloat(m_levelField.getText());
					dispose();
				} catch (NumberFormatException ex) {
					JOptionPane.showMessageDialog(m_frame,
							"Please enter a number.", "Invalid Input",
							JOptionPane.ERROR_MESSAGE);
				}
			} else			
				dispose();
		}
	}
}