Music keyboard example in Qt

Article Metadata

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Tested with

Devices(s): Nokia 5800 XpressMusic, Nokia N97 mini

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Compatibility

Platform(s): S60 5th Edition

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Article

Keywords: Qt Resource System, Animation Framework, GraphicsView, Orientation

Created: (06 Apr 2010)

Last edited: axeljaeger (06 Apr 2010)

Under Construction: This article is under construction and it may have outstanding issues. If you have any comments please use the comments tab.

Introduction

The keyboard demo shows a music keyboard that can play tones in either square, saw or traingle sound wave.

In portrait mode, the user can choose a waveform and adjust the volume. A small keyboard for soundtest is provided in the bottom. In landscape mode, the whole screen is filled with a keyboard to be used for actual playing of a song.

The whole user interface is implemented with QGraphicsWidgets in a QGraphicsScene. Animated transitions between portrait and lanscape are provided. Switching modes by rotating the device is provided using the XQDeviceOrientation-mobile-extension.

The whole project can be compiled also for the desktop. The UI is surrounded by a device skin then and a controll panel to give the device orientation is provided.

Sound playback is provided when compiled for S60 using native code. As soon as the is a backend for Qt multimedia for Symbian is available, the example will be ported to use the Qt audio system. Playback will then on both mobile and desktop using the same code path.

Because of XQDeviceOrienation, the example uses ReadDeviceData and thus cannot be self signed. Use symbian signed online for your own testing.

Screenshot

Download

File:Keyboard.zip