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The Unusual Suspect: Layouts for sleeker KDE applications
The document discusses advancements in layout design for KDE applications, highlighting the collaboration between Nokia Research Institute and Qt Software. It covers flexible and custom layout options, emphasizing the importance of interactive and dynamic user interfaces. The presentation also indicates ongoing discussions about integrating declarative UI for improved layout management.
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The Unusual Suspect: Layouts for sleeker KDE applications
- 1. The Unusual Suspect: Layoutsfor sleeker KDE applications Caio Marcelo de Oliveira Filho Eduardo Madeira Fleury July 6th, 2009
- 2. Who are we? •Nokia research institute in Brazil – INdT • openBossa – FOSS stream at INdT • Collaborating with Qt Software / KDE: - Qt Kinetic ← that's us :-) - Qt Webkit - Plasma Netbook - ItemViews-NG
- 3. Background • Fluid andRich UIs have become a standard • Collaborative work: designers and developers • Several initiatives to enhance KDE looks - High level - Low level • Layouting tools needed to evolve
- 4. Layouts in Qt •Engine that handles geometry of items • Widgets can use layouts to manage its children • Today: Linear, Grid, Stacked and Form
- 5. Covered in thispresentation • Flexible Layouts • Custom Layouts • Application of Layouts and Widgets • Multiple Layouts • Integration with Declarative UI
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- 7. Flexible Layouts • Layoutbehavior based on its configuration • Designers can interact with the layout • More power, less layouts • AnchorLayout available at Qt Gitorious • Edje relative positioning is similar
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- 9. Custom Layouts • Layoutbehavior rules based on its engine • Developers implement custom algorithms • Abstract / Hide internal decisions • Powerful handling of item addition / removal • Internal animations
- 10. Usage of Flexiblevs Custom • C++: Call methods x Create subclass • Call methods: Good for high level tool or QML • Subclasses: More control, require a developer
- 11. LAYOUTS OR CONTAINER WIDGETS
- 12. Container Widgets • Alsoresponsible for children geometries • Usually create its own items • ItemViews: “delegates” or “item creators” • Can be flexible too (e.g. ItemViews-NG) • Container Widget = Engine + Widget Factory
- 13. Layouts or ContainerWidgets? • Layouts handle child widgets • Container Widgets handle data (e.g. models) • Container Widget = Layout + Widget Factory
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- 15. Multiple Layouts • Applicationscreens are dynamic • Different states associated to the interface • Single set of widgets, multiple layouts • Animate from one layout to another
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- 17. Declarative UI Integration •Layouts are declarative! • Layout integration still in discussion • Use property propagation to “anchor” items • Support for layouts would be useful: - Different layouts - Optimization
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- 19. Qt Labs America •Qt / KDE place in America, starting in Brazil • Promotion and mentoring of FOSS projects • Tech-days in universities • Working together with KDE
- 20. Caio Marcelo deOliveira Filho caio.oliveira@openbossa.org Eduardo Madeira Fleury eduardo.fleury@openbossa.org http://eduardofleury.com Freenode #qt-kinetic