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2013, By: Seo Master

seo SEO Tools of all needed 2013

Seo Master present to you: On April 7th, Google launched a new version of Gmail for mobile for iPhone and Android-powered devices. We shared the behind-the-scenes story through this blog and decided to share more of what we've learned in a brief series of follow-up blog posts. This week, I'll talk about different ways to animate the floaty bar.

Even from the earliest brainstorming days for our new version of Gmail for iPhone and Android-powered devices, we knew we wanted to try something novel with menu actions: a context-sensitive, always-accessible UI element that follows conveniently as a user scrolls. Thus, the "floaty bar" was born! It took us a surprisingly long time, experimenting with different techniques and interactions, to converge on the design you see today. Let's look under the covers to see how the animation is achieved. You may be surprised to find that the logic is actually quite simple!

Screenshots of the floaty bar in action

In CSS:

.CSS_FLOATY_BAR {
 ...
 top: -50px;  /* start off the screen, so it slides in nicely */
 -webkit-transition: top 0.2s ease-out;
 ...
}

In JavaScript:

// Constructor for the floaty bar
gmail.FloatyBar = function() {
 this.menuDiv = document.createElement('div');
 this.menuDiv.className = CSS_FLOATY_BAR;
 ...
};

// Called when it's time for the floaty bar to move
gmail.FloatyBar.prototype.setTop = function() {
 this.menuDiv.style.top = window.scrollY + 'px';
};

// Called when the floaty bar menu is dismissed
gmail.FloatyBar.prototype.hideOffScreen = function() {
 this.menuDiv.style.top = '-50px';
};

gmail.floatyBar = new gmail.FloatyBar();

// Listen for scroll events on the top level window
window.onscroll = function() {
 ...
 gmail.floatyBar.setTop();
 ...
};

The essence here is that when the viewport scrolls, the floaty bar 'top' is set to the new viewport offset. The -webkit-transition rule specifies the animation parameters. (The 'top' property is to be animated, over 0.2s, using the ease-out timing function.) This is the animation behavior we had at launch, and it works just fine on Android and mobile Safari browsers.

However, there's actually a better way to achieve the same effect, and the improvement is particularly evident on mobile Safari. The trick is to use "CSS transforms". CSS transforms is a mechanism for applying different types of affine transformations to page elements, specified via CSS. We're going to use a simple one which is translateY. Here's the same logic, updated to use CSS transforms.

In CSS:

.CSS_FLOATY_BAR {
 ...
 top: -50px;  /* start off the screen, so it slides in nicely */
 -webkit-transition: -webkit-transform 0.2s ease-out;
 ...
}

In JavaScript:

// Called when it's time for the floaty bar to move
gmail.FloatyBar.prototype.setTop = function() {
 var translate = window.scrollY - (-50);
 this.menuDiv.style['-webkit-transform'] = 'translateY(' + translate + 'px)';
};

// Called when the floaty bar menu is dismissed
gmail.FloatyBar.prototype.hideOffScreen = function() {
 this.menuDiv.style['-webkit-transform'] = 'translateY(0px)';
};

Upon every scroll event, the floaty bar is translated vertically to the new viewport offset (modulo the offscreen offset which is important to the floaty bar's initial appearance). And, why exactly is this such an improvement? Even though the logic is equivalent, iPhone OS's implementation of CSS transforms is "performance enhanced", whilst our first iteration (animating the 'top' property) is performed by the OS in software. That's why the experience was unfortunately somewhat chunky at times, depending on the speed of the iPhone hardware.

You'll see smoother looking floaty bars coming very soon to an iPhone near you. This is just the first in a series of improvements we're planning for the mobile Gmail floaty bar. Watch for them in our iterative webapp, rolling out over the next couple of weeks and months!

By Joanne McKinley, Software Engineer, Google Mobile

Previous posts from Gmail for Mobile HTML5 Series:
HTML5 and Webkit pave the way for mobile web applications
Using AppCache to launch offline - Part 1
Using AppCache to launch offline - Part 2
Using AppCache to launch offline - Part 3
A Common API for Web Storage
Suggestions for better performance
Cache pattern for offline HTML5 web application
Using timers effectively
Autogrowing Textareas
Reducing Startup Latency2013, By: Seo Master

seo Gmail for Mobile HTML5 Series: CSS Transforms and Floaty Bars 2013

Seo Master present to you:

By Scott Knaster, Google Code Blog Editor

Hackathons are a blast. There are few experiences better than writing code all night with dozens or hundreds of others, consuming free food, and converting that sweet sleep deprivation into creativity as you hack. As hackathons go, this one is spectacular: Hack4Transparency takes place in Brussels at the European Parliament. The goal of this event is to make data more accessible and intelligible to consumers and to government.

You expect food and WiFi at a hackathon. But this is really cool: if you’re selected to attend, the hackathon pays your travel and accommodation expenses, and a couple of the best hacks will win a prize of €3.000. If that got your attention, read the full story on our Open Source Blog, and then apply to attend.

When I was a wee hacker, I would sometimes break up my coding sessions with a primitive videogame called Pong. Physicists at Cambridge University are still playing this game, sort of, except now they’re knocking a single electron back and forth. As if that Pong ball wasn’t small and easy to miss enough already.

Finally, if you have some time this weekend and you’re not coding or playing video games, you can check out this excellent collection of sounds from spaceflights posted by NASA. You can even make them into ringtones, so if you want to hear a 50-year-old Sputnik beep when your friends call, go for it.

2013, By: Seo Master

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seo SEO Tools of all needed 2013

seo Gmail for Mobile HTML5 Series: CSS Transforms and Floaty Bars 2013

seo Fridaygram: EU Hackathon, electron Pong, sounds from space 2013

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