November 2009
Intermediate to advanced
407 pages
8h 16m
English
Content preview from Safari® and WebKit Development for iPhone® OS 3.0Become 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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Chapter 8. Programming the Canvas
The unique platform capabilities of the iPhone enable developers to create innovative applications inside of Safari that go beyond the normal "Web app" fare. Safari/WebKit's support for the canvas element opens drawing and animation capabilities in an ordinary HTML page that was previously available only by using Flash or Java. The canvas element is part of the Web Hypertext Application Technology Working Group (WHATWG) specification for HTML 5.0 (or HTML5).
However, once you begin to open these capabilities, you need to be sure that you are working with an iPhone and iPod touch rather than a standard desktop browser that may or may not provide HTML5 support. So, I'll start by showing you how to identify the user agent for iPhone and iPod touch.
Identifying the User Agent
When you are trying to identify the capabilities of the browser requesting your Web site or application, you generally want to avoid detecting the user agent and use object detection instead. However, if you are developing an application designed exclusively for iPhone or need to guarantee the browser being used, user agent detection is a valid option. Therefore, this chapter assumes you are creating a Safari-specific application.
The Safari user agent string for iPhone closely resembles the user agent for Safari on other platforms. However, it contains an iPhone platform name and the mobile version number. Depending on the version of Mobile Safari, it will look something like this: ...
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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.