/*
 *  RapidMiner
 *
 *  Copyright (C) 2001-2008 by Rapid-I and the contributors
 *
 *  Complete list of developers available at our web site:
 *
 *       http://rapid-i.com
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see http://www.gnu.org/licenses/.
 */
package com.rapidminer.gui.look;

import java.awt.Component;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;

import javax.swing.JMenuItem;
import javax.swing.JPasswordField;
import javax.swing.JPopupMenu;
import javax.swing.KeyStroke;
import javax.swing.text.JTextComponent;

/**
 * The popup menu for all text components.
 *
 * @author Ingo Mierswa
 * @version $Id: ClipboardActionsPopup.java,v 1.3 2008/05/09 19:23:17 ingomierswa Exp $
 */
public class ClipboardActionsPopup extends JPopupMenu {

	private static final long serialVersionUID = -6304527692064490218L;

	private JTextComponent parent;
	
	private JMenuItem cutMenuItem;
	private JMenuItem copyMenuItem;
	private JMenuItem pasteMenuItem;
	private JMenuItem deleteMenuItem;
	private JMenuItem clearMenuItem;
	private JMenuItem selectAllMenuItem;

	public ClipboardActionsPopup(JTextComponent parent) {
		this.parent = parent;

		this.cutMenuItem = new JMenuItem(new javax.swing.text.DefaultEditorKit.CutAction());
		this.cutMenuItem.setText("Cut");
		this.cutMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X, ActionEvent.CTRL_MASK));

		this.copyMenuItem = new JMenuItem(new javax.swing.text.DefaultEditorKit.CopyAction());
		this.copyMenuItem.setText("Copy");
		this.copyMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C, ActionEvent.CTRL_MASK));

		this.pasteMenuItem = new JMenuItem(new javax.swing.text.DefaultEditorKit.PasteAction());
		this.pasteMenuItem.setText("Paste");
		this.pasteMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V, ActionEvent.CTRL_MASK));

		this.deleteMenuItem = new JMenuItem(new TextActions.DeleteTextAction());

		this.clearMenuItem = new JMenuItem(new TextActions.ClearAction());

		this.selectAllMenuItem = new JMenuItem(new TextActions.SelectAllAction());
		this.selectAllMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A, ActionEvent.CTRL_MASK));

		this.add(this.cutMenuItem);
		this.add(this.copyMenuItem);
		this.add(this.pasteMenuItem);
		this.add(this.deleteMenuItem);
		this.addSeparator();
		this.add(this.clearMenuItem);
		this.add(this.selectAllMenuItem);

		this.setPreferredSize(new Dimension((int) this.getPreferredSize().getWidth() + 30, (int) this.getPreferredSize().getHeight()));
	}

	protected final JTextComponent getTextComponent(Component c) {
		if (c != null) {
			if (c instanceof JTextComponent) {
				return (JTextComponent) c;
			}
		}
		return null;
	}

	@Override
	public void show(Component invoker, int x, int y) {
		JTextComponent target = getTextComponent(invoker);
		if (target == null) {
			return;
		}
		if (target instanceof JPasswordField) {
			this.copyMenuItem.setEnabled(false);
			this.cutMenuItem.setEnabled(false);
		} else {
			if (target.getSelectionStart() != target.getSelectionEnd()) {
				this.copyMenuItem.setEnabled(true);
			} else {
				this.copyMenuItem.setEnabled(false);
			}
			if ((target.getSelectionStart() != target.getSelectionEnd()) && target.isEditable()) {
				this.cutMenuItem.setEnabled(true);
			} else {
				this.cutMenuItem.setEnabled(false);
			}
		}

		if (target.isEditable()) {
			this.pasteMenuItem.setEnabled(true);
		} else {
			this.pasteMenuItem.setEnabled(false);
		}
		if (target.isEditable() && (target.getSelectionStart() != target.getSelectionEnd())) {
			this.deleteMenuItem.setEnabled(true);
		} else {
			this.deleteMenuItem.setEnabled(false);
		}
		if (getTextLength(target) > 0) {
			this.selectAllMenuItem.setEnabled(true);
		} else {
			this.selectAllMenuItem.setEnabled(false);
		}
		if ((getTextLength(target) > 0) && target.isEditable()) {
			this.clearMenuItem.setEnabled(true);
		} else {
			this.clearMenuItem.setEnabled(false);
		}
		super.show(invoker, x, y);
		this.parent.requestFocus();
	}

	private int getTextLength(JTextComponent c) {
		if (c == null) {
			return 0;
		}
		if (c.getText() == null) {
			return 0;
		}
		return c.getText().length();
	}

	@Override
	public void setVisible(boolean val) {
		try {
			super.setVisible(val);
			this.parent.requestFocus();
		} catch (Exception exp) {
			// do nothing
		}
	}
}