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Creating

Slick User InterfacesWith Qt

Espen Riskedal / CutehacksSEE 2010

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Purpose of this talk

Explain which Qttechnologies to use now,and what to choosein the future.

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Espen Riskedal

Masters from University of Bergen

6 years in Trolltech

2 years in NOKIA

Co-founded Cutehacks AS

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Mobile appsSymbian

MeeGo

Android

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Agenda

A quick Qt primerThe good and the bad

QWidget

QGraphicsView

Qt Quick

QtWebKit (HTML5)

Conclusion

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A quick Qt primer«Which class was

that again?»

QWidget

QWebView

QDeclarativeView

QGraphicsView

QFrame

QAbstractScrollArea

QPaintDeviceQObject

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QWidget QGraphicsView

Qt Quick QtWebKit

The Good and the Bad

«What do I gainand what do I lose?»

QWidget

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QWidget

Low-level

Painting

Alien widgets

Scrolling

Mature

High-level

Touch interface

Resolution dep.

Style API

Transformations

Good Bad

Yr.noby cutehacks.com

Flightsby cutehacks.com

Programming tip #1Hire a designer :)

Programming tip #2qDrawBorderPixmap (...)

Programming tip #3QWidget::scroll(...)Qt::WA_OpaquePaintEvent

QGraphicsView

QGraphicsView

Resolution indep.

Transformations

Lightweight items

Layers

Anchor layouts

Components

Performance

Style API

Good Bad

Orange Wednesdaysby orange.co.uk

Images from http://blog.symbian.org/2010/07/30/building-orange-wednesdays-in-qt/

Programming tip #4QGraphicsItem::setCacheMode()QGraphicsItem::DeviceCoordinateCache

Qt Quick

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Qt Quick

Property bindings

Rapid prototyping

Resolution indep.

No compile

Anchor layouts

Components

Memory

Style API

Good Bad

Work in progressby cutehacks.com

Flickr mobileby qt.nokia.com

Programming tip #5don't mix too many layers of transparencydon't build too deep hierarchiesdon't put javascript in the critical path

QtWebkit + HTML5

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QtWebKit + HTML5

Standard

Cross-platform

Designer friendly

Corporations

Memory

CPU

Immature

Good Bad

Sencha Touchby sencha.com

Programming tip #6QGraphicsWebView

Conclusion

«It depends :-)»

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Conclusion

Right now

Custom widgets on top

of QWidget

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Conclusion

Near future (Q1 2011)

Qt Quick

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Conclusion

A year from now (Q3 2011)

HTML5?

Qt Quick withQt components?

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Multi platform

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THANK YOU!

Questions?

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http://cutehacks.com@snowpong