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/*
 * Copyright © 1996-2009 GlobalMentor, Inc. 
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.globalmentor.swing.unicode;

import java.awt.Color;
import java.awt.Component;
import java.awt.Font;

import javax.swing.JTable;
import javax.swing.table.DefaultTableCellRenderer;

import com.globalmentor.awt.Fonts;
import com.globalmentor.unicode.*;

/**
 * A renderer that displays Unicode code points in a table.
 * @author Garret Wilson
 */
public class UnicodeTableCellRenderer extends DefaultTableCellRenderer {

	/**
	 * Returns the renderer component. This implementation assumes that the parent implementation always returns this.
	 * @param table The JTable.
	 * @param value The value to assign to the cell at [row, column].
	 * @param isSelected true if cell is selected.
	 * @param hasFocus true if cell has focus.
	 * @param row The row of the cell to render.
	 * @param column The column of the cell to render.
	 * @return The table cell renderer.
	 */
	public Component getTableCellRendererComponent(final JTable table, final Object value, final boolean isSelected, final boolean hasFocus, final int row,
			final int column) {
		setBackground(null); //remove any cached background color
		final Component component = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column); //do the default configuration of the render component
		if(value instanceof Integer) { //the value should be an integer object
			final String text; //we'll determine the value to display
			final String description; //we'll determine the description
			final Integer codePoint = ((Integer)value).intValue(); //get the integer value of the code point
			final UnicodeCharacter unicodeCharacter = UnicodeData.getUnicodeCharacter(codePoint); //get the character information for this code point			
			if(unicodeCharacter != null) { //if we have a description of this code point
				if(unicodeCharacter.isControl()) { //if this is a control character
				//TODO del					text=""+unicodeCharacter.getUniqueCharacterName()+"";	//use the unique character name of the character TODO update the font, maybe					
				//TODO del					text=unicodeCharacter.getCharacterName();	//show "" in place of the character
					text = "CTL"; //show "CTL" in place of the character TODO use an icon
					final Font baseFont = getFont(); //get the current font
					setFont(baseFont.deriveFont((float)Math.round(baseFont.getSize() / 2))); //reduce the size of the normal text
				} else { //if this is not a control character
					final char character = (char)unicodeCharacter.getCodeValue(); //cast the Unicode code point to a character
					text = String.valueOf(character); //get a string representing that character TODO fix to work with extended Unicode code points
					setFont(Fonts.getFont(character, table.getFont())); //make sure the font supports the character
				}
				description = unicodeCharacter.getUniqueCharacterName(); //use the character name for the description
			} else { //if we don't know anything about this code point
			//TODO del				text=UnicodeCharacter.getCodePointString(codePoint);	//just list the code point value TODO use an "unassigned" icon
				text = ""; //don't show anything for the unassigned code point
				setBackground(Color.LIGHT_GRAY); //set the background color to indicate an unassigned code point
				description = "?"; //show an unassigned description
			}
			setValue(text); //update the value
			setToolTipText(description); //show the description in the tooltip
		}
		setHorizontalAlignment(CENTER); //center the text horizontally
		setVerticalTextPosition(CENTER); //center the text vertically
		return component; //return the render component
	}

}