data matrix generator c# open source 3: Working with the Nokia Qt SDK in C#

Printer DataMatrix in C# 3: Working with the Nokia Qt SDK

CHAPTER 3: Working with the Nokia Qt SDK
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The class header file helloworld.h defines a single QObject, extending Qt s QMainWindow class (Listing 3 2).
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Listing 3 2. The application s HelloWorld class. #ifndef HELLOWORLD_H #define HELLOWORLD_H #include <QMainWindow> namespace Ui { class HelloWorld; } class HelloWorld : public QMainWindow { Q_OBJECT public: explicit HelloWorld(QWidget *parent = 0); ~HelloWorld(); private: Ui::HelloWorld *ui; }; #endif // HELLOWORLD_H
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The application s main window contains a central widget, which holds the controls for your application s user interface. (As you ll see in 6, you can actually swap in and out different collections of widgets, letting you show different screens in the same window.) The Qt Designer constructs this widget from the controls you ve drawn out, using the XML and the automatically generated C++ we mentioned previously. This declaration of the user interface is done in your application s Ui namespace; as you see in Listing 3 3, you can access the compile-time-generated user interface components in that namespace.
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Listing 3 3. The implementation of the helloworld class #include "helloworld.h" #include "ui_helloworld.h" HelloWorld::HelloWorld(QWidget *parent) : QMainWindow(parent), ui(new Ui::HelloWorld) { ui ->setupUi(this); } HelloWorld::~HelloWorld() { delete ui; }
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There s a direct binding between the Designer s controls and your source code; if you return to the Designer, select a widget (say, the push button) and look at the right-hand side of the window (Figure 3 7). You ll see a list of properties for the widget you ve
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CHAPTER 3: Working with the Nokia Qt SDK
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selected, including the object s name. You can access the widgets in the Ui:HelloWorld class directly just by referencing their name, like this:
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ui ->pushButton ->setText("Yo.");
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Try this in helloworld.cpp, just after the call to ui ->setupUi(this). (You may need to compile your application first, if you re relying on name completion in the source editor.) At this point, it s worth a quick compile-build cycle, just to see what you ve created. Click the green Run button (the green arrow) at the bottom of the left-hand pane, and the IDE will compile your application and start it in the Qt simulator (Figure 3 8).
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Figure 3 8. Hello World, compiled and running in the Qt Simulator.
Before you continue, we urge you to stop, put down the book, and spend an hour or so experimenting with Qt Designer and this sample application. Try: Adding more widgets to the main window. Adding an empty widget to the main window, and then dropping widgets on it. On the empty widget, set different layouts and see how things are positioned. Using the property inspector or source code completion in the editor, look at the properties different widgets bear. Try changing some of them, either at compile- or run-time.
CHAPTER 3: Working with the Nokia Qt SDK
Place a breakpoint in HelloWorld s constructor by clicking next to the line numbers, and run the debugger by clicking the run arrow with the superimposed bug on the left. Anything else that comes to mind. The Qt Creator is a powerful tool, and with it you can accomplish an awful lot right out of the box without writing a line of code. Think of the time you spend playing with it now as a small investment that will reap rewards later when you sketch out or build your killer application s user interface.
Compiling and Running Your Code on a Device
Before we get to the nitty-gritty of running your code on a device, let s spend a couple more minutes looking at the Qt Simulator. The simulator has two windows the window showing what your application will look like on the device, and a second window that lets you control the behavior of the simulator itself. This second view is divided into several auto-hiding panes; choose the View pane, open it, and try choosing a different device or adjusting the zoom level. As we write this, you can simulate Maemo, Symbian touch-enabled devices, and non-touch devices, which together span Nokia s platforms that support Qt. Other panes let you simulate various properties of the device, such as its battery level, position, network availability, contacts in the contacts database, and so forth. Much of this is important when testing applications that use Qt Mobility, which we discuss in 5. Returning to the IDE, choose the Projects icon from the left-hand pane, and see the different build configurations for your project (shown in Figure 3 9).
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