The Future of Qt Widgets

The Future Of Qt Widgets

• Marius Bugge Monsen (mbm) • Qt Developer • Qt Widget Team Lead

Déjà vu?

Reading Tea-Leaves

The Elephant In The Room

• UI Extensions for Mobile • Scalable UI based on QGraphicsView

• Harmattan UI Framework • UI Framework build on QGraphicsView

• Next Generation Qt Widgets •?

Canvas And Paint

A C B D

A B C D

Window System Paint Painting Code #include<QtGui> int main(int argc, char *argv[]) { QApplication a (argc,argv); QWidget w; w.show(); return a.exec(); } Update

A B C D

Window System Window Surface Painting Code #include<QtGui> int main(int argc, char *argv[]) { QApplication a (argc,argv); QWidget w; w.show(); return a.exec(); }

• Window • Widgets • Procedural Painting

Not Fast Enough!

• Window • Widgets • Primitive Elements

• Graphical Primitive Elements • Pixmaps • Meshes • Shaders

• Graphical Primitive Elements • Live in Graphics Memory • Very Fast

• Other Elements • Input • Sound • Haptics • ...

• Declarative Format (QML) • Canvas / Scenegraph API • HW Acceleration (OpenGL ES2 / OpenVG)

Talking Nerdy

Widget

Look & Feel Data & Logic

Mouse Region Grip 42 Groove Text

Groove Grip Text Mouse Region Look & Feel

Groove Grip Range Control Text Mouse Region Look & Feel Data & Logic

Groove minimum Mouse maximum Region Range ... Control Text value Grip position Look & Feel Data & Logic

Image { id: groove property alias value: control.value property int minimum: 25 property int maximum: 75 ... BorderImage { id: grip ... } RangeControl { id: control minimumValue: groove.minimum maximumValue: groove.maximum minimumPosition: 0 maximumPosition: groove.width - grip.width position: grip.x } }

Text 42 Grip Dial Mouse Region

Dial Range Text Grip Mouse Control Region Look & Feel Data & Logic

Image { id: dial property alias value: control.value ... Image { id: grip ... } Text { id: text text: control.value ... } MouseRegion { id: input ... } RangeControl { id: control minimumValue: dial.minimum maximumValue: dial.maximum ... } }

Mature & New & Shiny Tested Look & Feel Data & Logic

• QDateTimeControl • QLineEditControl • ...

The Road Ahead

• Qt Declarative + Controls • QGraphicsItem + Controls • QWidget + Controls

• Future Widget Technology + Controls

• labs.trolltech.com • qt.gitorious.org/qt-labs/widgets-ng • Google Summer Of Code

Thank You! Questions?

Image credits: “The Elephant In The Room” by Nancee_art on flickr “Tea Leaves” by allaboutgeorge on flickr “Painting Detail” by katiew on flickr “Mixerboard” by Manuel_P on flickr “Talk Nerdy To Me” by Ian Farrell on flickr “Impassable” by stuckincustoms on flickr

The Future of Qt Widgets

by Qt Project on Mar 16, 2010

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