The Touch of TasteDo you speak coffee? HGZ Kaffemaschinen

The Touch of Taste - Agenda

• Why Qt

– signal-and-slots

– linguist tool

– layout manager

• Retrospection

– app design: UI, PD, SI

– platform-independent development

• Conclusions

2

A simple button…

Multimedia touch driven coffee machine

Signal and Slots

The 'signal and slots' mechanism is a save and easy solution for the normally complex inter object data exchange. And gives a condensed overview of the defined interface.

Qt Linguist by Trolltech (Nokia)

Layout Manager

• QHBoxLayout Class

• QVBoxLayout Class

• QGridLayout Class

Layout Manager - configuration

• exact positioningvoid QGridLayout::setRowMinimumHeight ( int row, int minSize ) Sets the minimum height of row row to minSize pixels.See also rowMinimumHeight() and setColumnMinimumWidth().

• flexible positioningvoid QGridLayout::setRowStretch ( int row, int stretch ) Sets the stretch factor of row row to stretch. The first row is number 0.The stretch factor is relative to the other rows in this grid. Rows with a higher stretch factor take more of the available space.The default stretch factor is 0. If the stretch factor is 0 and no other row in this table can grow at all, the row may still grow.See also rowStretch(), setRowMinimumHeight(), and setColumnStretch().

HGZ Touch Application Design

Platform-independent development

• Your application will run across all „supported“ Qt

platforms, if... all Qt-features and calls are supported by

the hardware. This was our biggest drawback.

– Buggy mouse handler

– Floating point calculations led to kernel exceptions

– Embedded Linux without GStreamer to execute multimedia

Conclusions

• Qt's development framework– huge variety of objects or structures ready to use or easily to configure

– 'signals and slots' mechanism is a save and easy solution for

communication, and results in good quality of code and so reduces the

time-consuming debugging and error detection

– Qt‘s translation concept in combination with their layout manager is a

powerful instrument

– Qt's instant support, good documentation of the classes in the

framework and worldwide fan community is a source for new ideas

We care about coffee and milk

• Thanks for listening!

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