computer science

Qt Extended

Qt Extended is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Qt Extended rather than just read about it. In short: Qt Extended (named Qtopia before September 30, 2008) is an application platform for embedded Linux-based mobile computing devices such as personal digital assistants, video projectors and mobile phones. It was initially developed by The Qt Company, at the time known as Qt Software and a subsidiary of Nokia.

Key takeaways

Qt Extended belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Qt Extended to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Qt Extended from memory before moving on to harder problems.

Reference excerpt

Qt Extended (named Qtopia before September 30, 2008) is an application platform for embedded Linux-based mobile computing devices such as personal digital assistants, video projectors and mobile phones. It was initially developed by The Qt Company, at the time known as Qt Software and a subsidiary of Nokia. When they cancelled the project the free software portion of it was forked by the community and given the name Qt Extended Improved. The QtMoko Debian-based distribution is the natural successor to these projects as continued by the efforts of the Openmoko community.

Features Qt Extended features:

Windowing system Synchronization framework Integrated development environment Internationalization and localization support Games and multimedia Personal information manager applications Full screen handwriting Input methods Personalization options Productivity applications Internet applications Java integration Wireless support Qt Extended is dual licensed under the GNU General Public License (GPL) and proprietary licenses.

Devices and deployment As of 2006, Qtopia was running on several million devices, including 11 mobile phone models and 30 other handheld devices. Models included the Sharp Corporation Zaurus line of Linux handhelds, the Sony mylo, the Archos Portable Media Assistant (PMA430) (a multimedia device), the GamePark Holdings GP2X, Greenphone (an open phone initiative), Pocket PC, FIC Openmoko phones: Neo 1973 and FreeRunner. An unofficial hack allows its use on the Archos wifi series of portable media players (PMP) 604, 605, 705, and also on several Motorola phones such as E2, Z6 and A1200. The U980 of ZTE is the last phone running it.

Software development Native applications could be developed and compiled using C++. Managed applications could be developed in Java.

Discontinuation On March 3, 2009, Qt Software announced the discontinuation of Qt Extended as a standalone product, with some features integrated on the Qt Framework.

Qt Extended Improved The Openmoko community has forked the final stable release into Qt Extended Improved (later renamed to QtMoko) which, like its predecessor, is an application platform for embedded Linux-based mobile computing devices such as personal digital assistants, video projectors and mobile phones dual licensed under the GNU General Public License (GPL) and proprietary licenses. Qt Extended Improved can run on several mobile devices, most notably the Openmoko phones: Neo 1973 and FreeRunner.

Other mobile operating systems Access Linux Platform Android iOS MeeGo Nucleus RTOS Openmoko Linux Palm webOS Symbian Tizen Windows Mobile

References

External links

Qt Extended Whitepaper from Qt Software "Qtopia Screenshots". Trolltech. Archived from the original on February 28, 2009. Retrieved 29 June 2009.

Illustrations

Qt Extended: Qt Extended data structure file — Qt Extended data structure file

Worked examples

Example 1 — a first encounter with Qt Extended

Start with the simplest possible case. Write down what Qt Extended claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Qt Extended before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Qt Extended ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Qt Extended

In research: Qt Extended appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Qt Extended in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Qt Extended is common in secondary-school and first-year university syllabi. It links to neighbouring topics Embedded Linux, Mobile Linux, Mobile software, so understanding it makes those chapters shorter.
In everyday life: Look for Qt Extended outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Qt Extended in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Qt Extended means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Qt Extended out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Qt Extended in simple terms?

Why does Qt Extended matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Qt Extended?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Qt Extended.