June 2005
Beginner to intermediate
336 pages
6h 29m
English
Content preview from Java™ After Hours: 10 Projects You'll Never Do at Work
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Undoing a Change
When the user selects the File menu's Undo menu item, Graphicizer is supposed to undo the most recent operation. For example, if you blurred an image and then selected Undo, the original version of the image would appear.
In order to undo an operation, Graphicizer makes a backup copy of each image before performing an operation, as shown here, where the backup copy, bufferedImageBackup, is made when the user clicks a button:
if(event.getSource() == button1){
bufferedImageBackup = bufferedImage;
.
.
.
Later, if the user selects the Undo menu item, all you need to do is to copy the backup image to bufferedImage and then display the newly restored image, resizing the main window if needed:
if(event.getSource() == menuitem3){ ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.