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CHAPTER 1 THE QT WAY OF C++
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Slots can be public, protected, or private. These sections are labeled as public slots:, protected slots:, or private slots:. Signals are signal prototypes and are placed after the signals: label. Slots are implemented as any other member function, although you never implement signals just declare them in the class definition and let the meta-object compiler handle the details. When connecting signals and slots, remember that the connect method cannot handle argument values, only argument types. The values of the arguments must come from the emitting object. When using signals and slots, you must inherit QObject and start the class declaration with the Q_OBJECT macro. This adds the required code and tells the meta-object compiler that the class needs a meta-object. As soon as you have inherited QObject, you can assign a parent to an object and any number of children. Each parent takes responsibility for calling delete on its children, so as long as you make sure to delete the ancestor to all objects, all objects are deleted. Qt has classes for handling the tasks that usually are handled by the C++ standard template library, STL. The Qt equivalents are more adapted to be used in combination with Qt, but can interact with their STL equivalents with ease. For handling text, use the QString class. It supports Unicode and interacts well with the QStringList class. The string list class offers methods for search and replace in all strings contained in the list as well as for joining the strings with a delimiter of your choice. For keeping lists of any sort of object, Qt has the template classes QList, QLinkedList, and QVector. All have pros and cons, but QList is usually the right choice. When inserting items in the middle of a very large list, use QLinkedList when constant time insertions and quick sequential access are required. QVector is good at random access and when items are required to be stored in order in contiguous memory. For queues and stacks, the QQueue and QStack classes work well; they offer quick insertion and access from the ends indicated by their name. When you use a stack, you push and pop to the top; when you use a queue, you enqueue items on the tail and dequeue them from the head. The QMap and QHash classes associate items with keys. The QHash class sorts the items in an arbitrary order while performing slightly faster than the QMap class. The map always sorts the items by key. For managing several items per key, it is best to use the QMultiMap or QMultiHash classes. If you do not need to associate any items to a key but want to maintain a list of keys, the QSet class is right for you. It works as a hash, but without any associated values.
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CHAPTER
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Rapid Application Development Using Qt
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lthough Qt started as a tool for developing cross-platform applications with graphical user interfaces, the toolkit has expanded into a tool useful for building all types of software command-line applications, embedded software, and graphical user interfaces for heavy workstation applications. The historical roots show as Qt makes it really easy to create a graphical user interface and build an application around it. This chapter goes from the original idea all the way to a working application in a few easy steps.
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The Sketch
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When developing software, it is always good to have a plan a sketch that shows what it is that you are trying to achieve. The goal of this chapter is a very simple phone book that holds a list of contacts and phone numbers. The graphical user interface, UI from here on, will be built around two dialogs: one for showing the list and available actions, and one for editing contacts. Figure 2-1 shows an early draft of the two dialogs.
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