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Building HTML5 AppsAriya Hidayat, Sencha
08/29/112
08/29/11
Building HTML5 App
Ariya HidayatEngineering Director
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whoami
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08/29/115
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Pure web apps (run in the browser)
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Hybrid solution (delivered as native apps)
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Pure Web Apps
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Common Myths
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Only works offline
Slow Does not use GPU acceleration
Only JavaScriptTedious to code
Manual layout of appsNo GUI designer
Can’t do fluid animation Not crossplatform
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“Too many phones will kill you...”
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Supported Platforms
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Desktop
Mobile
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Adoption
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Amazon Kindle Cloud Reader
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Financial Times
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JavaScript: Ubiquitous Programming Environment
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Need for Speed
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Internet Explorer 8Google Chrome 13
Firefox 6 0.41 seconds
0.44 seconds
7.43 seconds
SunSpider 0.9.1
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Libraries and Frameworks
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Offline Support
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Application CacheLocal Storage
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Application Cache
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<html manifest=”foobar.appcache”>...</html>
CACHE MANIFEST# version 42
CACHE:style.csslogic.jsimages/logo.png
NETWORK:http://api.example.comlogin/
FALLBACK:*.html offline.html
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Application Cache
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offline online
CACHE use cache update
NETWORK can’t use use remote
FALLBACK use fallback use remote
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Local Storage
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localStorage.setItem(‘foo’, ‘bar’);
localStorage.getItem(‘foo’);
localStorage.removeItem(‘foo’);
localStorage.clear();
~ 5 MB
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CSS3 Animation
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http://mozillademos.org/demos/planetarium/demo.html
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Canvas for Visualization
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http://thejit.org/JavaScript InfoVis Toolkit
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Canvas for Games
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http://ariya.blogspot.com/2010/09/invade-destroy.html
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Pixel Manipulations
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http://ariya.github.com/canvas/crossfading/
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Vector Graphics
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http://raphaeljs.com/polar-clock.html
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WebGL for 3-D
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http://webglsamples.googlecode.com/hg/aquarium/aquarium.html
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WebGL for Visualization
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http://senchalabs.github.com/philogl/
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Which is for what?
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CSS3 Canvas SVG WebGL
Animation of UI elements ✔
2-D visualization ✔ ✔
Imperative drawing ✔
2-D scene-graph ✔ ✔
3-D scene graph ✔
2-D game ✔ ✔ ✔
3-D game ✔
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Hybrid Native + Web
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Going Hybrid?
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Security
Advanced Technologies App Store/ Marketplace
Platform Integration
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Real-world Hybrid Apps
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Sencha AnimatorExt Designer
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WebKit Everywhere
Browser
Devices
Runtime
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History
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0
20000
40000
60000
80000
100000
0 1 2 3 4 5 6 7 8 9 10
Rev
isio
ns
Years
~2000 commits/month
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Components of WebKit
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WebKit Library
JavaScriptCore
WebCore
HTMLrendering
SVG
DOM CSS
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Platform Abstraction
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Network Unicode Clipboard
Graphics Theme Events
Thread Geolocation Timer
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Different “Ports”
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WebCore graphics
Mac Chromium Qt Gtk
CoreGraphics
Skia
QPainter
Cairo
graphics stack
GraphicsContext
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QWeb* classes
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QWebView (widget)
QWebPage (object)
QWebFrame (object)
At least one, i.e. the main frame of the page
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Using QWebView
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QWebView webView;webView.show();webView.setUrl(QUrl("http://meego.com"));
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Contents via String
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QWebView webView;webView.show();webView.setContent("<body>Hello, MeeGo!</body>");
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Contents via Resource
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QWebView webView;webView.show();webView.setUrl(QUrl("qrc:/content.html"));
<RCC> <qresource prefix="/"> <file>content.html</file> </qresource></RCC>
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Capture to Image
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QWebPage page;QImage image(size, QImage::Format_ARGB32_Premultiplied);image.fill(Qt::transparent);QPainter p(&image);page.mainFrame()->render(&p);p.end();image.save(fileName);
http://labs.qt.nokia.com/2009/01/15/capturing-web-pages/
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SVG Rasterizer
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http://labs.qt.nokia.com/2008/08/06/webkit-based-svg-rasterizer/
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Search + Preview
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http://labs.qt.nokia.com/2008/11/04/search-with-thumbnail-preview/
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Exposing to the Web World
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QWebFrame::addToJavaScriptWindowObject(QString, QObject*)
Public functionsObject properties
Child objects
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Exposing to the Web World
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class Dialog: public QObject{ Q_OBJECT
public: Dialog(QObject *parent = 0);
public slots: void showMessage(const QString& msg);};
page()->mainFrame()->addToJavaScriptWindowObject("Dialog", new Dialog);
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Exposing to the Web World
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<input type="button" value="Try this" onClick="Dialog.showMessage('You clicked me!')">
instance of Dialog object public slot
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Signal and Slot
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foobar.modified.connect(refresh);
QObject instance JavaScript function
signal
foobar.modified.connect(obj, refresh);
any object
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Triggering Action from Native
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class Stopwatch: public QObject{ Q_OBJECT
public: Stopwatch(QObject *parent = 0);
signals: void tick(int t);
private slots: void update();
private: int m_index;};
Stopwatch::Stopwatch(QObject *parent) : QObject(parent) , m_index(0){ QTimer *timer = new QTimer(this); timer->setInterval(1000); connect(timer, SIGNAL(timeout()), SLOT(update())); timer->start();}
void Stopwatch::update(){ emit tick(m_index++);}
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Triggering Action from Native
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<script>Stopwatch.tick.connect(function(t) { document.getElementById('tick').innerText = t;});</script>
instance of Stopwatch object
signal
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Coming Back to Native
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QVariant QWebFrame::evaluateJavaScript(QString)
mostly key-value pair(like JavaScript objects)
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Platform Integration
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Application
Menu and Menu Bar
Dialogs
Notifications
System Access
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Debugging
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settings()->setAttribute(QWebSettings::DeveloperExtrasEnabled, true);
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Consume Web 2.0
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http://labs.qt.nokia.com/2009/03/08/creating-a-google-chat-client-in-15-minutes/
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Code Editor
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http://bit.ly/x2-codemirror
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Folder Visualization
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http://bit.ly/x2-foldervis
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GPU Acceleration
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Game vs Web
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Primitive Drawing
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Backing Store
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when you pinch...
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Layer Compositing
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Logical 3-D
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smooth animation FTW!
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Conclusions
Web technologies are moving really fast
Various frameworks and libraries boost the productivity
Hybrid approach helps the migration
Tools need to catch-up
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