August 2015
Intermediate to advanced
246 pages
4h 21m
English
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Attaching callbacks
Now, we have created a new kind of event, so it is possible to attach callback methods to our new event as we have in the predefined events. For this recipe, we will create a new event and attach a callback function to it. If the button text changes, the event as in the past recipe will be fired.
Getting ready
We will use the code from the previous recipe as the base of this recipe and will add a different touch so that we can change the button when it is double tapped. Hence, I would advise you to go through the previous recipe again. Also, the reader may find the section on multitouching from Chapter 2, Input, Motion, and Touch useful specifically.
How to do it…
Perform the following steps:
- First, in the KV file, declare an empty ...
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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.