Qt4编程权威指南：C++ GUI实战（第二版）

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"C++ GUI QT4编程第二版英文版，由Jasmin Blanchette和Mark Summerfield合著，由Prentice Hall出版社在2008年2月4日出版，适合C++ GUI编程初学者及工程师参考，提供高清版本，包含752页内容，涵盖完整的目录和索引，全面介绍Qt4.3编程的最佳实践。" 本书是Trolltech官方认可的、关于Qt4.3编程的最佳实践指南，特别强调了无源代码更改的情况下在Windows、Linux/Unix、Mac OS X和嵌入式Linux上运行的工业级C++应用程序的开发。作者作为Trolltech的内部专家，提供了从头到尾的Qt4.3使用教程，帮助读者掌握最新版本的Qt。书中的内容广泛而深入，包含了许多现实世界的例子和专业建议。它揭示了当前最佳的Qt编程模式，特别是针对模型/视图架构的实现，以及利用Qt4.3增强的图形支持。书中涵盖了几乎所有的GUI开发任务，同时提供了高级技术，如数据库访问、XML集成和子类化等。以下是书中可能涉及的关键知识点： 1. **Qt框架基础**：介绍Qt库的基本概念、安装和设置，以及如何创建第一个Qt应用。 2. **Qt设计模式**：深入解析Qt中的模型/视图架构，包括模型、视图、控制器的概念及其在实际开发中的应用。 3. **图形界面设计**：利用Qt的图形工具和部件构建用户界面，如QWidgets、QGraphicsView和QPainter等。 4. **事件处理和信号与槽机制**：解释如何处理用户交互，以及Qt的信号与槽机制在事件驱动编程中的作用。 5. **布局管理**：学习如何使用不同的布局管理器优化界面元素的排列和调整。 6. **数据库集成**：介绍如何通过QSqlDatabase和相关类进行数据库操作，包括查询、插入、更新和删除数据。 7. **网络编程**：讲解如何使用Qt的网络模块进行HTTP、FTP等网络通信。 8. **XML支持**：探讨如何读写XML文件，以及使用Qt的QDomDocument和QXmlStreamReader/QXmlStreamWriter类进行XML处理。 9. **多线程编程**：理解并应用Qt的QThread类来实现并发和异步操作。 10. **国际化和本地化**：学习如何使用Qt的翻译工具和QTranslator类为应用程序添加多语言支持。 11. **嵌入式开发**：介绍在嵌入式平台上的Qt应用开发，包括资源管理和优化。通过本书，读者不仅可以学习到Qt4.3的核心功能，还能了解到最佳的编程实践，从而提高开发效率和应用质量。对于想要提升C++ GUI编程技能的人来说，这是一个不可或缺的资源。

The Plastique style is the default style for Qt/X11 applications running under KDE, and Cleanlooks is the

default under GNOME. These styles use gradients and anti-aliasing to provide a modern look and feel. Qt

application users can override the default style by using the -style command-line option. For example,

to launch the Age application using the Motif style on X11, simply type the following command:

./age -style motif

Unlike the other styles, the Windows XP, Windows Vista, and Mac styles are available only on their

native platforms, since they rely on the platforms' theme engines.

An additional style, QtDotNet, is available from Qt Solutions. It is also possible to create custom styles, as

explained in Chapter 19.

QGridLayout lays out widgets in a grid.•

The call to QWidget::setLayout() on line 22 installs the layout manager on the window. Behind the scenes, the

QSpinBox and QSlider are "reparented" to be children of the widget on which the layout is installed, and for this reason we

don't need to specify an explicit parent when we construct a widget that will be put in a layout.

Figure 1.7. The Age application's widgets and layout

Even though we didn't set the position or size of any widget explicitly, the QSpinBox and QSlider appear nicely laid out side

by side. This is because QHBoxLayout automatically assigns reasonable positions and sizes to the widgets for which it is

responsible, based on their needs. The layout managers free us from the chore of hard-coding screen positions in our applications

and ensure that windows resize smoothly.

Qt's approach to building user interfaces is simple to understand and very flexible. The most common pattern that Qt programmers

use is to instantiate the required widgets and then set their properties as necessary. Programmers add the widgets to layouts, which

2. Creating Dialogs

Subclassing QDialog•

Signals and Slots in Depth•

Rapid Dialog Design•

Shape-Changing Dialogs•

Dynamic Dialogs•

Built-in Widget and Dialog Classes•

This chapter will teach you how to create dialog boxes using Qt. Dialog boxes present users with options and choices, and allow

them to set the options to their preferred values and to make their choices. They are called dialog boxes, or simply "dialogs",

because they provide a means by which users and applications can "talk to" each other.

Most GUI applications consist of a main window with a menu bar and toolbar, along with dozens of dialogs that complement the

main window. It is also possible to create dialog applications that respond directly to the user's choices by performing the

appropriate actions (e.g., a calculator application).

We will create our first dialog purely by writing code to show how it is done. Then we will see how to build dialogs using Qt

Designer, Qt's visual design tool. Using Qt Designer is a lot faster than hand-coding and makes it easy to test different designs and

to change designs later.

Subclassing QDialog

Our first example is a Find dialog written entirely in C++. It is shown in Figure 2.1. We will implement the dialog as a class in its

own right. By doing so, we make it an independent, self-contained component, with its own signals and slots.

Figure 2.1. The Find dialog

The source code is spread across two files: finddialog.h and finddialog.cpp. We will start with finddialog.h.

1 #ifndef FINDDIALOG_H

2 #define FINDDIALOG_H

3 #include <QDialog>

4 class QCheckBox;

5 class QLabel;

6 class QLineEdit;

7 class QPushButton;

Lines 1 and 2 (and 27) protect the header file against multiple inclusions.

Line 3 includes the definition of QDialog, the base class for dialogs in Qt. QDialog is derived from QWidget.

Lines 4 to 7 are forward declarations of the Qt classes that we will use to implement the dialog. A forward declaration tells the

C++ compiler that a class exists, without giving all the detail that a class definition (usually located in a header file of its own)

provides. We will say more about this shortly.

Next, we define FindDialog as a subclass of QDialog:

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