/*
    * Copyright (c) 2003-2008 by Cosylab d. d.
    *
    * This file is part of CosyBeans.
    *
    * CosyBeans is free software: you can redistribute it and/or modify
    * it under the terms of the GNU General Public License as published by
    * the Free Software Foundation, either version 3 of the License, or
    * (at your option) any later version.
   *
   * CosyBeans is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with CosyBeans.  If not, see <http://www.gnu.org/licenses/>.
   */
  
  package com.cosylab.gui;
  
  import java.awt.Component;
  import java.awt.Dimension;
  import java.awt.Graphics;
  import java.awt.GridBagConstraints;
  import java.awt.GridBagLayout;
  import java.awt.Insets;
  import java.awt.event.KeyAdapter;
  import java.awt.event.KeyEvent;
  
  import javax.swing.Icon;
  import javax.swing.ImageIcon;
  import javax.swing.JLabel;
  import javax.swing.JPanel;
  import javax.swing.JTextField;
  import javax.swing.SwingConstants;
  
  import com.cosylab.gui.components.util.IconHelper;
  import com.cosylab.gui.components.util.PaintHelper;
  
  /**
   * <code>IconEditor</code> is a simple editor which enables selecting an icon.
   * User can enter the path to the icon and the icon will be shown next to the
   * input field. Icon can be selected from the classpath.
   * 
   * @author Jaka Bobnar, Cosylab
   *
   */
  public class IconEditor extends JPanel {
  	
  	private static final long serialVersionUID = 7625485410292542663L;
  
  	public static final String ICON = "icon";
  	
  	private JLabel iconLabel;
  	private JLabel titleLabel;
  	private JTextField pathField;
  	private String title;
  	private Icon selectedIcon;
  	private static final int HEIGHT = 32;
  	private static final int WIDTH = 32;
  	private static final Icon NULL_ICON = new Icon() {
  		public int getIconHeight() {
  			return HEIGHT;
  		}
  		public int getIconWidth() {
  			return WIDTH;
  		}
  		public void paintIcon(Component c, Graphics g, int x, int y) {
  			PaintHelper.paintDisabled(g, x, y, WIDTH, HEIGHT);			
  		}
  	};
  	
  	/**
  	 * Constructs a new IconEditor.
  	 *
  	 */
  	public IconEditor() {
  		this("Icon");
  	}
  	
  	/**
  	 * Constructs a new IconEditor with the given title.
  	 * 
  	 * @param title
  	 */
  	public IconEditor(String title) {
  		super();
  		this.title = title;
  		initialize();
  	}
  	
  	private void initialize() {
  		setLayout(new GridBagLayout());
  		titleLabel = new JLabel(title);
  		this.add(titleLabel, new GridBagConstraints(0,0,2,1,1,0,GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(11,11,1,11),0,0));
  		this.add(getPathField(), new GridBagConstraints(0,1,1,1,1,0,GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, new Insets(1,11,11,0),0,0));
  		this.add(getIconLabel(), new GridBagConstraints(1,1,1,1,0,0,GridBagConstraints.EAST, GridBagConstraints.HORIZONTAL, new Insets(1,4,11,11),0,0));
  	}
 	
 	private JTextField getPathField() {
 		if (pathField == null) {
 			pathField = new JTextField();
 			pathField.setMaximumSize(new Dimension(100,21));
 			pathField.setPreferredSize(new Dimension(100,21));
 			pathField.setMinimumSize(new Dimension(100,21));
 			pathField.addKeyListener(new KeyAdapter() {
 				@Override
 				public void keyReleased(KeyEvent e) {
 					internalSetIcon(IconHelper.createIcon(pathField.getText()), false);
 				}
 			});
 			pathField.setToolTipText("Type image file path from classpath.");
 		}
 
 		return pathField;
 	}
 	
 	private JLabel getIconLabel() {
 		if (iconLabel == null) {
 			iconLabel = new JLabel();
 			iconLabel.setHorizontalAlignment(SwingConstants.RIGHT);
 			iconLabel.setMinimumSize(new Dimension(WIDTH + 5, HEIGHT + 5));
 			iconLabel.setMaximumSize(new Dimension(WIDTH + 5, HEIGHT + 5));
 			iconLabel.setPreferredSize(new Dimension(WIDTH + 5, HEIGHT + 5));
 			iconLabel.setIcon(NULL_ICON);
 		}
 		return iconLabel;
 	}
 	
 	/**
 	 * Sets the Icon to this editor.
 	 * 
 	 * @param icon
 	 */
 	public void setIcon(Icon icon) {
 		internalSetIcon(icon, true);
 	}
 	
 	/**
 	 * Sets the path to the icon.
 	 * 
 	 * @param path
 	 */
 	public void setIcon(String path) {
 		String old = getIconPath();
 		if ((old != null && old.equals(path)) || (old == null && path == null)) return;
 		internalSetIcon(IconHelper.createIcon(path), true);
 		getPathField().setText(path);
 	}
 	
 	private void internalSetIcon(Icon icon, boolean setPathField) {
 		Icon oldValue = getIconLabel().getIcon();
 		if ((oldValue != null && oldValue.equals(icon)) || 
 			(oldValue == null && icon == null)) return;
 		selectedIcon = icon;
 		if (icon instanceof ImageIcon && icon.getIconHeight() > HEIGHT && icon.getIconWidth() > WIDTH) {
 			getIconLabel().setIcon(IconCustomizer.getScaledIcon((ImageIcon)icon, HEIGHT,WIDTH));
 		} else if (icon != null){
 			getIconLabel().setIcon(icon);
 		} else {
 			getIconLabel().setIcon(NULL_ICON);
 		}
 		
 		if (icon != null && setPathField)
 			getPathField().setText(icon.toString());
 		
 		firePropertyChange(ICON, oldValue, icon);
 	}
 	
 	/**
 	 * Returns the selected icon.
 	 * @return
 	 */
 	public Icon getIcon() {
 		return selectedIcon;
 	}
 
 	/**
 	 * Returns the title.
 	 * 
 	 * @return
 	 */
 	public String getTitle() {
 		return titleLabel.getText();
 	}
 	
 	/**
 	 * Returns the path to the icon.
 	 * 
 	 * @return
 	 */
 	public String getIconPath() {
 		return getPathField().getText();
 	}
 
 	/**
 	 * Sets the title.
 	 * 
 	 * @param title
 	 */
 	public void setTitle(String title) {
 		this.title = title;
 		titleLabel.setText(title);
 	}
 }