September 2019
Beginner
512 pages
12h 52m
English
Content preview from Flutter for Beginners
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The shouldRepaint method
This is an important method, especially for the Flutter engine. This is what it looks like:
bool shouldRepaint ( covariant CustomPainter oldDelegate)
It receives just the oldDelegate argument, which corresponds to the last delegate (this CustomPainter class instance) that was responsible for painting onto CustomPaint. Whenever it returns false, then the paint call might be optimized away (this does not mean the paint will not be called). We should compare the old and current delegate to see whether any data related to the paint is different, and then return true in this case.
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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.