TarTool example source code file (AWTUtilities.java)

This example TarTool source code file (AWTUtilities.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - TarTool tags/keywords

awt, component, container, dialog, dimension, dimension, event, font, gridbagconstraints, gridbagconstraints, image, image, net, network, point, point, string, string, toolkit, util

The TarTool AWTUtilities.java source code

/*
** Tim Endres' utilities package.
** Copyright (c) 1997 by Tim Endres
** 
** This program is free software.
** 
** You may redistribute it and/or modify it under the terms of the GNU
** General Public License as published by the Free Software Foundation.
** Version 2 of the license should be included with this distribution in
** the file LICENSE, as well as License.html. If the license is not
** included	with this distribution, you may find a copy at the FSF web
** site at 'www.gnu.org' or 'www.fsf.org', or you may write to the
** Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139 USA.
**
** THIS SOFTWARE IS PROVIDED AS-IS WITHOUT WARRANTY OF ANY KIND,
** NOT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY. THE AUTHOR
** OF THIS SOFTWARE, ASSUMES _NO_ RESPONSIBILITY FOR ANY
** CONSEQUENCE RESULTING FROM THE USE, MODIFICATION, OR
** REDISTRIBUTION OF THIS SOFTWARE. 
** 
*/

package com.ice.util;

import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.net.URL;
import java.io.IOException;
import java.util.*;

/**
 * This is a class that contains useful utility functions related
 * to the Java AWT package.
 */


public class
AWTUtilities
	{
	static public Point
	centerDialogInParent( Dialog dialog, Component parent )
		{
		Point parLoc = parent.getLocationOnScreen();

		Dimension parSz = parent.getSize();
		Dimension dlgSz = dialog.getSize();

		int x = parLoc.x + (parSz.width - dlgSz.width) / 2;
		int y = parLoc.y + (parSz.height - dlgSz.height) / 3;
		
		return new Point( x, y );
		}

	static public Point
	computeDialogLocation( Dialog dialog, int w, int h )
		{
		Dimension scrnSz =
			dialog.getToolkit().getScreenSize();

		int x = (scrnSz.width - w) / 2;
		int y = (scrnSz.height - h) / 3;
		
		return new Point( x, y );
		}

	static public Point
	computeDialogLocation( Dialog dialog )
		{
		Dimension dlgSz = dialog.getSize();
		Dimension scrnSz =
			dialog.getToolkit().getScreenSize();

		int x = (scrnSz.width - dlgSz.width) / 2;
		int y = (scrnSz.height - dlgSz.height) / 3;
		
		return new Point( x, y );
		}

	static public Point
	computeDialogLocation( Dialog dialog, Component rel )
		{
		Dimension dlgSz = dialog.getSize();
		Dimension scrnSz = dialog.getToolkit().getScreenSize();

		int x = (scrnSz.width - dlgSz.width) / 2;
		int y = (scrnSz.height - dlgSz.height) / 3;
		
		if ( rel != null )
			{
			Dimension relSz = rel.getSize();
			Point loc = rel.getLocationOnScreen();

			x = loc.x + ((relSz.width - dlgSz.width) / 2);

			y = loc.y + ((relSz.height - dlgSz.height) / 2);
			}

		if ( x < 0 ) x = 0;
		if ( y < 0 ) y = 0;

		return new Point( x, y );
		}

	static public void
	constrain(
			Container container, Component component,  
			int fill, int anchor,
			int gx, int gy, int gw, int gh, double wx, double wy )
		{
		GridBagConstraints	c =
			new GridBagConstraints();

		c.fill = fill;
		c.anchor = anchor;
		c.gridx = gx;
		c.gridy = gy;
		c.gridwidth = gw;
		c.gridheight = gh;
		c.weightx = wx;
		c.weighty = wy;

		( (GridBagLayout)container.getLayout() ).
			setConstraints( component, c );

		container.add( component );
		}

	static public void
	constrain(
			Container container, Component component,  
			int fill, int anchor,
			int gx, int gy, int gw, int gh,
			double wx, double wy, Insets inset )
		{
		GridBagConstraints	c =
			new GridBagConstraints();

		c.fill = fill;
		c.anchor = anchor;
		c.gridx = gx;
		c.gridy = gy;
		c.gridwidth = gw;
		c.gridheight = gh;
		c.weightx = wx;
		c.weighty = wy;
		c.insets = inset;

		( (GridBagLayout)container.getLayout() ).
			setConstraints( component, c );

		container.add( component );
		}

	static public void
	constrain(
			Container container, Component component,  
			int fill, int anchor,
			int gx, int gy, int gw, int gh,
			double wx, double wy,
			int ipadx, int ipady )
		{
		GridBagConstraints	c =
			new GridBagConstraints();

		c.fill = fill;
		c.anchor = anchor;
		c.gridx = gx;
		c.gridy = gy;
		c.gridwidth = gw;
		c.gridheight = gh;
		c.weightx = wx;
		c.weighty = wy;
		c.ipadx = ipadx;
		c.ipady = ipady;

		( (GridBagLayout)container.getLayout() ).
			setConstraints( component, c );

		container.add( component );
		}

	static public Font
	getFont( String fontName )
		{
		StringTokenizer toker =
			new StringTokenizer( fontName, "-", false );

		String sName = "Helvetica";
		String sStyle = "plain";
		String sSize = "12";

		int numTokes = toker.countTokens();
		boolean isok = true;

		try {
			if ( numTokes > 0 )
				{
				sName = toker.nextToken();

				if ( numTokes == 2 )
					{
					sSize = toker.nextToken();
					}
				else if ( numTokes == 3 )
					{
					sStyle = toker.nextToken();
					sSize = toker.nextToken();
					}
				}
			}
		catch ( Exception ex )
			{
			System.err.println
				( "Bad font specification '" + fontName + "' - "
					+ ex.getMessage() );
			return null;
			}

		int style =
				  (sStyle.equalsIgnoreCase( "plain" ) )
					? Font.PLAIN :
				( (sStyle.equalsIgnoreCase( "bold" ) )
					? Font.BOLD :
				( (sStyle.equalsIgnoreCase( "italic" ) )
					? Font.ITALIC : (Font.BOLD + Font.ITALIC) ) );

		int size = Integer.parseInt( sSize );

		return new Font( sName, style, size );
		}

	// The subtlety in getResource() is that it uses the
	// Class loader of the class used to get the rousource.
	// This means that if you want to load a resource from
	// your JAR file, then you better use a class in the
	// JAR file.

	public static Image
	getImageResource( String name )
		throws java.io.IOException
		{
		return
			AWTUtilities.getImageResource
				( AWTUtilities.class, name );
		}

	public static Image
	getImageResource( Class base, String name )
		throws java.io.IOException
		{
		Image	result = null;

		URL imageURL = base.getResource( name );

		if ( imageURL != null )
			{
			Toolkit	tk = Toolkit.getDefaultToolkit();

			result = tk.createImage
				( (ImageProducer) imageURL.getContent() );
			}
		
		return result;
		}

	public static Image
	getSystemImageResource( String name )
		throws java.io.IOException
		{
		Image	result = null;

		URL imageURL = ClassLoader.getSystemResource( name );
		if ( imageURL != null )
			{
			Toolkit	tk = Toolkit.getDefaultToolkit();

			result = tk.createImage
				( (ImageProducer) imageURL.getContent() );
			}
		
		return result;
		}

	}