columnpopupmenu.java

具有不同语法高亮的编辑器实例

/*
 * 09/16/2004
 *
 * ColumnPopupMenu.java - A popup menu capable of having multiple columns of
 *                        menu items.
 * Copyright (C) 2004 Robert Futrell
 * [e-mail]
 * www.website.com
 *
 * 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.
 */
package org.fife.ui;

import java.awt.Component;
import java.awt.GridLayout;
import javax.swing.JPopupMenu;


/**
 * FIXME:  This class needs its own layout that behaves like a cross between
 *         GridLayout and BoxLayout(Y_AXIS).  It currently uses GridLayout but
 *         that makes separators the same height as regular menu items!!
 */
public class ColumnPopupMenu extends JPopupMenu {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1972419982380122049L;

	private int desiredColumns;


/*****************************************************************************/


	/**
	 * Constructor.
	 *
	 * @param desiredColumns The number of columns for this popup menu.  Note
	 *        that if the number of menu items is less than this value, then
	 *        value, then the popup menu will only use enough columns for all of
	 *        columns for all of the items (for appearances).  A value of
	 *        A value of <code>1</code> here makes the popup menu behave
	 *        exactly like a regular popup menu.
	 */
	public ColumnPopupMenu(int desiredColumns) {
		super();
		this.desiredColumns = desiredColumns;
	}


/*****************************************************************************/


	/**
	 * Sets up the layout properly, depending on the number of items in the
	 * popup menu.  You only need to call this once, after all items have been
	 * added to the popup menu.  If you add or remove any items, you should
	 * recall this method.
	 */
	public void redoLayout() {
		Component[] comps = getComponents();
		int numComponents = comps.length;
		removeAll();
		if (numComponents<desiredColumns)
			setLayout(new GridLayout(1, numComponents));
		else {
			int columnCount = desiredColumns;
			int rowCount = numComponents/columnCount;
			if ((numComponents%columnCount)!=0)
				rowCount++;
			setLayout(new GridLayout(rowCount, columnCount));
		}
		for (int i=0; i<comps.length; i++)
			add(comps[i]);
	}


/*****************************************************************************/

}