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In the last chapter, we showed you some basic Qt features using a prototype of Shake, our earthquake-reporting application that takes data from the U.S. Geological Survey and renders the result as a list of earthquake events, showing the data associated with a specific event. The application had several shortcomings, including a user interface that doesn t match the classic item list/item view paradigm of most mobile applications, an inability to determine how close you were to a particular event, and no good way to get a geographic overview of all of the events that have occurred. For this chapter, we ve extended Shake in several ways: The application now has separate list, item, and map views, as Figure 5 3 shows. As with other Qt mobile applications, the views are selected from the options menu, although selecting a list item also shows the item view.
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CHAPTER 5: Doing More with Qt
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The map view demonstrates how to implement a custom widget that renders data from a Qt model. The application detail view includes more information about the event, including information from its summary and the title, and if information is available, your current distance from the reported event.
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Figure 5 3. The three screens of the final Shake application as written using Qt: in (a) the list view, (b) the options menu, (c) an item view obtained by touching a list item, and (d) the map view
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To do this, we: Refactored the application to use a separate application controller class to manage all of the various signals from the UI, network and Qt Mobility layer. Added actions to the main window options menu for view selection. Inserted a QObject that proxies QAction into the item view s QWebView, which now displays a Back button. Wrote a map widget that takes data from the application model and plots it over a Mercator projection map provided as a bitmap. The following sections look at each of these changes in more detail.
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CHAPTER 5: Doing More with Qt
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Looking inside the Application Controller
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When you launch Qt Creator to create a new Qt GUI application, by default it creates a subclass of QMainWindow, the object that will contain your application s user interface. As defaults go, it s not bad, but many applications don t really need to subclass QMainWindow. What they do need, however, is a controller a QObject-derived class that has slots to accept the various signals from different components in the application. While you can certainly use a QMainWindow subclass to do this, as we did in the previous chapter, it seems in principle a poor idea, because there s an implied relationship with QMainWindow that simply doesn t exist. Because we were adding additional slots to our application to handle user actions and position information, this seems a good time to break the controller into its own subclass. First, we refactored main.cpp as you see in Listing 5 7.
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Listing 5 7. Shake s entry point. #include <QtGui/QApplication> #include "maincontroller.h" int main(int argc, char *argv[]) { QApplication app(argc, argv); MainController* controller = new MainController; int result = app.exec(); delete controller; return result; }
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As you see, instead of creating an instance a QMainWindow subclass and showing it, we create our MainController instance, and it has a QMainWindow it shows as part of its initialization. Listing 5 8 shows the class definition for MainController in full, which we discuss over this and the next section.
Listing 5 8. Shake s MainController class #ifndef MAINCONTROLLER_H #define MAINCONTROLLER_H #include <QObject> #include <QPair> #include <QMobilityGlobal.h> #include <QGeoPositionInfoSource> #include <QGeoPositionInfo> class class class class class class class class class class class class QSortFilterProxyModel; QProgressDialog; QModelIndex; QAction; QMainWindow; QStackedWidget; QListView; QWebView; WebActionProxy; WorkerThread; QuakeListModel; MapItemWidget;
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