Code Project: create a media player. Amarok is a great music player for KDE when judged by both its capabilities and its size. But it's hardly a quick point and click music player - it takes several clicks and some careful GUI navigation to listen to your music collection and that takes a toll on both your CPU and your head. We're going to offer an alternative by building the most simple and straightforward music player we could think of. We're going to take some inspiration from Apple's new i. Pod Shuffle, and only offer the bare minimum of controls.

One button for selecting your music, another button for play and pause, and a third button for skipping to the next track. For most people, and most uses, these are the only controls you need, and it makes a refreshing contrast to the bloated frippery of players like Amarok.

The build environment. Before we can get started with any programming, we have to satisfy several requirements for our player. The first is Qt 4. The development library contains the header files we import into our own projects so we can use Qt functionality outside of our own application.

Getting started. Now that you've got all the software installed, the next step is to get stuck in. Launch Creator, using either the launch menu or by typing.

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If your distribution recent enough, such as Ubuntu Jaunty, then you'll find Qt 4. If not, you're going to have to try it to track it down for yourself. Nokia provides packages which are easy enough to install, and these can sit alongside your current version of Qt, or you could try updating your distribution. Beginners will also need a working development environment.

You can test whether one is installed or not by typing 'make' on the command line. If the only output you get is a complaint that the command can't be found, you'll need to install the GNU series of build tools through your distribution's package manager. If you're using Ubuntu, for instance, just install the build- essentials package.

This includes fundamental programming tools such as the GCC compiler suite, the 'make' build system and the GDB debugger. Most other distributions should include the build environment with a default installation, but you should be able to find a similarly named meta- package if not. Audio playback on Linux, and most other operating systems for that matter, can be a minefield as the programmer tries to guess the hardware and software layers being used. Fortunately, Qt has one of the best solutions we've seen and that's to integrate the fantastic Phonon framework from KDE. Phonon sits on top of whatever audio drivers and routing layer you're using, and provides an interface between your programming and the complicated part of guess the configuration. It makes playing audio files relatively easy, and completely cross platform.

You will need to install Phonon and its development library. Along with several other dependencies, it will probably also require GStreamer, which is the backend of choice for most Linux distributions. Phonon will talk to GStreamer directly, while we'll only talk to Phonon. Qt Creator is usually part of the standard Qt 4.

Ubuntu users will need to grab the package manually. Getting started. Now that you've got all the software installed, the next step is to get stuck in.

Launch Creator, using either the launch menu or by typing 'qtcreator' on the command line. The application starts with a helpful wizard screen from which you can normal load previous projects or find out more about Qt. To start a new project, click on File > New from the menu.

This will launch the new project wizard, and your first tasks is to select the kind of project you want to create. Under the 'Projects' title, look for 'Qt. GUI Application' and click on OK. You now need to enter a name for the project and choose a folder where the project directory will be created. The next window is the module selection page.

This is where you select which additional components you want to include in your project. The two core modules which are used with every Qt project are already selected, Qt. Download Risk 2 Para Pc Descargar El. Core and Qt. GUI, and you need to select any non- core components you're likely to use. If you're developing a browser, for example, you'd want to include the Web. Kit module. We need just need to select Phonon, as we're using this to interact with the audio layer of the operating system. After selecting Phonon, the final page will list the default names for files and classes in your project, and you might as well keep these at their default values. Click on 'Finish' to end the wizard, create the folder and the file templates, all of which will be loaded into Creator automatically.

If you've used any form of IDE before, Qt Creator is going to feel familiar. There are several different modes of operation. The one you'll be spending the most time in initially is the GUI designer, and this is launched automatically when you click on a file ending with 'ui' - a User Interface designer file.

One of these files has already been added to your project, and you can see this along with four other files in the projects panel to the left of the main display. The two files ending with '. This has a corresponding header file, which is used to describe the object and development files we using in mainwindow. Finally, there's the '.

Qt and Creator to build your project. If you forget to include the modules you need from Creator's startup wizard, you can add them yourself to your project's '. GUI design. Double click on the 'ui' file in the project pane. The embedded designer view appears. If you've done any Qt programming in the past, you'll recognise the layout from the old Qt Designer application, which has been embedded into Creator more or less in- tact.

No one would ever accuse Designer of being easy to use, but it is powerful and allows you to create dynamic and expansive Qt GUI applications easier than using a pure programming approach. Thanks to its inclusion in Creator, you can now switch back and forth between GUI modifications and programming with ease, and this can make a dramatic improvement to development speed. Our application has only a very simple GUI. Scroll down the list of available widgets and drag three separate 'Push Buttons' from the Buttons section onto the grey application canvas.

Alternatively, drag a single button and copy/paste two more. These buttons are the only control we'll have over our application. One will be used to select the files to play, another will be used to play and pause the music and the final button will be used to skip to the next track. That's the complete opposite of Amarok's 2. We now need to give the user some indication of what each button does.

We can do this by either double- clicking on each button and using a word to describe the function, or using an icon in its place. For the icon, select the button and look for the value panel in the lower left quarter of Creator's screen. This holds most properties for the currently selected widget in your GUI. Scroll down until you see 'icon' in the list. Select the item, and click on the '..' button to the right to open a file requester. You can now select and use any image file you want for the button, but with a standard KDE installation, you might want to take a look at the '/usr/share/icons/oxygen/3.

This contains icons for most common functions, and the 'media- skip- forward', 'media- skip- backward' and 'media- playback- start' are particularly well suited to the functions we're going to implement. We now need to arrange these three buttons vertically, and restrict the size of the window. Hold down the left Ctrl key, and select each button individually.

They should all now have the scale border highlighted. Now click on the 'Lay Out Vertically' button in the toolbar (or the right click menu).

This will tie the three buttons together, and align them on top of one another. Now click on the application background and select 'Layout in a Grid' . This will stretch the three buttons to fill all the available space, and this should happen regardless of the window size. But we also want to make the window small.

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