/*
 * $Id: PHPCompletePopup.java,v 1.1 2003/02/14 01:05:29 gfx Exp $
 *
 * PHP Plugin for Jext
 *
 * Copyright (C) 2002 Nicolas Thouvenin
 * touv at yahoo dot fr
 *
 * This program 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 2
 * of the License, or 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
import java.awt.*;
import java.awt.event.*;

import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;

import org.jext.*;
import org.jext.gui.*;


public class PHPCompletePopup extends JWindow implements CaretListener
{
    private boolean selfInput;

    private JList itemsList;

    private String word;

    private JextFrame parent;
    private JextTextArea textArea;
    private PHPCompleteList truc;

    public PHPCompletePopup(JextFrame parent,  String word)
    {
	super(parent);

	this.parent = parent;
	this.textArea = parent.getTextArea();
	this.word = word;

	truc = new PHPCompleteList();

	JPanel pane = new JPanel();
	pane.setLayout(new BorderLayout());

	Font font = new Font("Monospaced", Font.PLAIN, 11);

	JLabel label = new JLabel("PHP Functions");
	label.setFont(font);
	pane.add(label, BorderLayout.NORTH);


	Object[] list = truc.buildFunctionList(word);
	itemsList = new JList(list);
	itemsList.setFont(font);
	itemsList.setVisibleRowCount(list.length < 5 ? list.length : 5);
	itemsList.setSelectedIndex(0);
	itemsList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
	itemsList.addMouseListener(new MouseHandler());
	itemsList.setCellRenderer(new FunctionsCellRenderer());

	FontMetrics fm = getFontMetrics(font);
	itemsList.setPreferredSize(new Dimension(40 * fm.charWidth('m'),(int) itemsList.getPreferredSize().height));

	JScrollPane scroll = new JScrollPane(itemsList);
	scroll.setBorder(null);
	pane.add(scroll, BorderLayout.SOUTH);
	pane.setBorder(LineBorder.createBlackLineBorder());
	getContentPane().add(pane);

	setBackground(Color.lightGray);

	GUIUtilities.requestFocus(this, itemsList);
	pack();

	int offset = textArea.getCaretPosition();
	int line = textArea.getCaretLine();
	int x = textArea.offsetToX(line, offset-textArea.getLineStartOffset(line));

	Dimension parentSize = parent.getSize();
	Point parentLocation = parent.getLocationOnScreen();
	Insets parentInsets  = parent.getInsets();

	Point tapLocation = textArea.getLocationOnScreen();
	Dimension popupSize = getSize();

	x += tapLocation.x;
	if ((x + popupSize.width) >  (parentLocation.x + parentSize.width - parentInsets.right))  {
	    x -= popupSize.width;
	}

	setLocation(x, tapLocation.y + textArea.lineToY(line) + fm.getHeight() + fm.getDescent() + fm.getLeading());
	setVisible(true);

	KeyHandler handler = new KeyHandler();
	addKeyListener(handler);
	itemsList.addKeyListener(handler);
	parent.setKeyEventInterceptor(handler);
	textArea.addCaretListener(this);
    }

    public void caretUpdate(CaretEvent evt)
    {
	if (!selfInput) {
	    dispose();
	}
	else {
	    selfInput = !selfInput;
	}
    }

    public void dispose()
    {
	parent.setKeyEventInterceptor(null);
	textArea.removeCaretListener(this);
	super.dispose();
	SwingUtilities.invokeLater(new Runnable()
	    {
		public void run()
		{
		    textArea.requestFocus();
		}
	    });
    }

    private void insertFunction()
    {
	textArea.setSelectedText(((PHPFunction) itemsList.getSelectedValue()).name.substring(word.length()));
    }


    class KeyHandler extends KeyAdapter
    {
	public void keyTyped(KeyEvent evt)
	{
	    char ch = evt.getKeyChar();
	    if (ch != '\b') {
		selfInput = true;
		textArea.setSelectedText(String.valueOf(ch));
		word += ch;

		Object[] list = truc.buildFunctionList(word);

		itemsList.setListData(list);
		itemsList.setSelectedIndex(0);
	    }
	}

	public void keyPressed(KeyEvent evt)
	{
	    switch (evt.getKeyCode())
		{
		case KeyEvent.VK_ENTER: //case KeyEvent.VK_SPACE:
		    insertFunction();
		    evt.consume();
		    dispose();
		    break;
		case KeyEvent.VK_ESCAPE:
		    dispose();
		    evt.consume();
		    break;
		case KeyEvent.VK_PAGE_UP:
		    if (getFocusOwner() == itemsList)
			return;

		    int selected = itemsList.getSelectedIndex();
		    selected -= 5;
		    if (selected < 0)
			selected = itemsList.getModel().getSize() - 1;

		    itemsList.setSelectedIndex(selected);
		    itemsList.ensureIndexIsVisible(selected);

		    evt.consume();
		    break;
		case KeyEvent.VK_PAGE_DOWN:
		    if (getFocusOwner() == itemsList)
			return;

		    selected = itemsList.getSelectedIndex();
		    selected += 5;
		    if (selected >= itemsList.getModel().getSize())
			selected = 0;

		    itemsList.setSelectedIndex(selected);
		    itemsList.ensureIndexIsVisible(selected);

		    evt.consume();
		    break;
		case KeyEvent.VK_UP:
		    if (getFocusOwner() == itemsList)
			return;

		    selected = itemsList.getSelectedIndex();
		    if (selected == 0)
			selected = itemsList.getModel().getSize() - 1;
		    else
			selected--;

		    itemsList.setSelectedIndex(selected);
		    itemsList.ensureIndexIsVisible(selected);

		    evt.consume();
		    break;
		case KeyEvent.VK_DOWN:
		    if (getFocusOwner() == itemsList)
			return;

		    selected = itemsList.getSelectedIndex();
		    if (selected == itemsList.getModel().getSize() - 1)
			return;

		    selected++;

		    itemsList.setSelectedIndex(selected);
		    itemsList.ensureIndexIsVisible(selected);

		    evt.consume();
		    break;
		default:
		    if (evt.isActionKey()) {
			dispose();
			parent.processKeyEvent(evt);
		    }
		    break;
		}
	}
    }

    class MouseHandler extends MouseAdapter
    {
	public void mouseClicked(MouseEvent me)
	{
	    insertFunction();
	    dispose();
	}
    }

    class FunctionsCellRenderer extends DefaultListCellRenderer
    {
	public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus)   {

	    setComponentOrientation(list.getComponentOrientation());
	    PHPFunction t = (PHPFunction) value;

	    if (isSelected)  {
		setBackground(list.getSelectionBackground());
		value = t.proto;
	    }
	    else {
		setBackground(list.getBackground());
	    }

	    setText((value == null) ? "" : value.toString());
	    setOpaque(isSelected);
	    setEnabled(list.isEnabled());
	    setFont(list.getFont());
	    setBorder((cellHasFocus) ? UIManager.getBorder("List.focusCellHighlightBorder") : noFocusBorder);

	    return this;
	}
    }

    /***************************************************************************
  Patch
     -> Memory management improvements : it may help the garbage collector.
     -> Author : Julien Ponge (julien@izforge.com)
     -> Date : 23, May 2001
    ***************************************************************************/
    protected void finalize() throws Throwable
    {
	super.finalize();

	itemsList = null;
	word = null;
	parent = null;
	textArea = null;
    }
    // End of patch
}