精通Qt5 C++ GUI编程：实战指南

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"Qt5 C++ GUI Programming Cookbook" 本书《Qt5 C++ GUI Programming Cookbook》是一本关于使用Qt5框架进行C++图形用户界面（GUI）编程的实用指南。作者Lee Zhi Eng通过一系列的实例和实践方法，帮助读者设计并构建功能性强、吸引力大且用户友好的软件应用界面。 Qt5是Qt库的一个重要版本，它提供了丰富的工具和类库，使得开发者能够方便地创建跨平台的GUI应用程序。这本书的核心知识点包括但不限于以下几个方面： 1. **Qt5基础知识**：介绍Qt5的基本概念，如安装和配置开发环境，以及Qt Creator IDE的使用，帮助读者快速上手。 2. **QWidgets和布局管理**：讲解如何使用QWidget类及其子类来创建各种UI元素，如按钮、文本框、标签等，并通过QLayout管理器实现元素的布局和对齐。 3. **事件处理和信号与槽机制**：深入理解Qt中的事件模型，学习如何处理用户输入事件，以及利用信号与槽机制实现组件间的通信。 4. **图形视图框架**：探讨如何使用QGraphicsView和QGraphicsItem来创建复杂的2D图形界面，支持缩放、旋转等交互操作。 5. **模型/视图编程**：介绍模型-视图-控制器（MVC）设计模式在Qt中的应用，如何使用QModel、QTableView等类实现数据的显示和编辑。 6. **网络编程**：学习使用Qt的网络模块进行HTTP请求、TCP/IP通信，以及数据的上传和下载。 7. **数据库集成**：讲解如何连接和操作SQL数据库，使用QSqlQuery、QSqlTableModel等类进行数据查询和操作。 8. **国际化和本地化**：了解如何使用Qt的翻译工具进行多语言支持，以及根据用户地区设置本地化内容。 9. **QML和Qt Quick**：介绍Qt Quick的QML语言，用于创建现代、动态的用户界面，以及如何与C++代码集成。 10. **性能优化和调试技巧**：提供关于提高程序性能的方法，以及使用Qt Creator进行调试的技巧。此外，书中还会涵盖错误处理、单元测试、打包与发布应用等内容，旨在让读者不仅能够掌握Qt5的基本用法，还能灵活应对各种复杂的GUI编程挑战。通过这本书的学习，读者将能够运用Qt5高效地开发出专业级别的跨平台GUI应用。

Preface

You can also download the code les by clicking on the Code Files button on the book's

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The code bundle for the book is also hosted on GitHub at https://github.com/

PacktPublishing/Qt5-C-GUI-Programming-Cookbook

. We also have other code

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PacktPublishing/

. Check them out!

Downloading the color images of this book

We also provide you with a PDF le that has color images of the screenshots/diagrams used

in this book. The color images will help you better understand the changes in the output.

You can download this le from http://www.packtpub.com/sites/default/files/

downloads/Qt5CGUIProgrammingCookbook_ColorImages.pdf

Errata

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Look and Feel Customization

Use style sheets with Qt Designer

In this example, we will learn how to change the look and feel of our program and make it look

more professional by using style sheets and resources. Qt allows you to decorate your Graphical

User Interfaces (GUIs) using a style sheet language called Qt Style Sheets, which is very similar

to Cascading Style Sheets (CSS) used by web designers to decorate their websites.

How to do it…

1. The rst thing we need to do is open up Qt Creator and create a new project. If this is

the rst time you have used Qt Creator, you can either click the big button that says

New Project with a + sign, or simply go to File | New File or New Project.

2. Then, select Application under the Project window and select Qt Widgets Application.

3. After that, click the Choose button at the bottom. A window will then pop out and

ask you to insert the project name and its location.

4. Once you're done with that, click Next several times and click the Finish button

to create the project. We will just stick to all the default settings for now. Once the

project has been created, the rst thing you will see is the panel with tons of big icons

on the left side of the window that is called the Mode Selector panel; we will discuss

this more later in the How it works... section.

5. Then, you will also see all your source les listed on the Side Bar panel which is

located right next to the Mode Selector panel. This is where you can select which le

you want to edit, which, in this case, is mainwindow.ui because we are about to

start designing the program's UI!

6. Double-click

mainwindow.ui and you will see an entirely different interface

appearing out of nowhere. Qt Creator actually helped you to switch from the script

editor to the UI editor (Qt Designer) because it detected the .ui extension on the le

you're trying to open.

7. You will also notice that the highlighted button on the Mode Selector panel has

changed from the Edit button to the Design button. You can switch back to the script

editor or change to any other tools by clicking one of the buttons located in the upper

half of the Mode Selector panel.

8. Let's go back to the Qt Designer and look at the

mainwindow.ui le. This is basically

the main window of our program (as the lename implies) and it's empty by default,

without any widget on it. You can try to compile and run the program by pressing the

Run button (green arrow button) at the bottom of the Mode Selector panel, and you

will see an empty window popping up once the compilation is complete:

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