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Describes four different ways of creating GUIs in Qt and what their pros and cons are. The different ways are: QWidget, QGraphicsView, Qt Quick and QtWebKit using HTML5. Thanks to Marius, Ariya, Alessandro and Henrik for helping out with it :) First given at SEE2010 in Amsterdam (http://www.see2010.org/)
Citation preview
1
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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