精通PySide开发动态GUI应用

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"Pyside.GUI.Application.Development.2nd.Edition.178528" 本书《PySide GUI 应用开发第二版》是面向初学者的指南，旨在帮助读者掌握使用PySide开发GUI应用的技能。PySide是一个开源的跨平台UI框架，为Python提供Qt框架的绑定，结合了Qt的强大功能和Python的易用性，成为Python开发者进行快速应用开发的优秀平台。在本书中，你可以学习到以下内容： 1. **安装与设置PySide**：了解如何在不同的操作系统上下载和安装PySide，以便开始GUI应用的开发工作。 2. **基础GUI编程**：掌握GUI编程的基本概念，包括窗口、菜单、工具栏、状态栏和子窗口的创建。 3. **事件管理**：学习处理用户输入和其他事件，理解事件循环和事件处理机制。 4. **信号与槽**：深入理解PySide中的信号和槽机制，这是Qt框架中实现组件间通信的关键。 5. **控件与对话框**：创建和定制各种控件（widgets）和对话框（dialogs），提升应用的交互性和用户体验。 6. **数据库集成**：将你的GUI应用连接到数据库，学会执行SQL查询，实现数据的管理和操作。 7. **跨平台开发**：了解如何编写可以在不同操作系统上运行的应用程序，充分利用PySide的跨平台特性。书中的章节安排如下： - 第1章：PySide入门，介绍PySide的基础知识和环境搭建。 - 第2章：通过窗口进入，讲解如何创建和管理主窗口。 - 第3章：主窗口与布局管理，讨论窗口布局的重要性以及如何有效管理。 - 第4章：事件与信号，详细阐述事件处理和信号槽的使用。 - 第5章：对话框与控件，教授如何创建和使用各种对话框和自定义控件。 - 第6章：数据库处理，涵盖数据库连接、查询和操作的实现方法。本书采用平易近人且实践性强的方式，适合Python程序员和熟悉面向对象编程的初学者。通过阅读和实践书中的例子，你将能够高效地编写GUI应用程序，并具备开发跨平台应用的能力。

Preface

[ vii ]

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brew install pyside

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Getting Started with PySide

[ 2 ]

Introducing PySide

Many of the modern programming languages are backed up by a set of libraries

(commonly referred to as toolkits) to create GUI applications, such as Qt, Tcl/Tk, and

so on. PySide is a Python binding of the cross-platform GUI toolkit Qt, and it runs on

all platforms that are supported by Qt, including Windows, Mac OS X, and Linux. It

is one of the alternatives to toolkits such as Tkinter for GUI programming in Python.

PySide combines the advantages of Qt and Python. A PySide programmer has

all the power of Qt, but it is able to exploit it with the simplicity of Python.

PySide is licensed under the LGPL version 2.1 license, allowing both Free/Open

Source software and proprietary software development. PySide is evolving

continuously, like any other open source product, and you are free to contribute

to its development. Some of the applications, such as matplotlib, PhotoGrabber,

QBitTorrent, Lucas Chess, Fminer and so on, certify the wide spread usage of PySide

in the software industry.

The IRC channel for PySide is #pyside at Freenode.

PySide has also become an enabler of mobile development. Qt Mobility is a project

that is creating a new suite of Qt APIs for mobile device functionality. The project

Pyside Mobility is a set of bindings that allows Python to access the Qt Mobility

API. The Qt Mobility API enables the developer to access the bread and butter of

services provided by the underlying operating system that are essential for any

mobile application. Learning PySide, you learn this for free. Without further ado,

let's get hacking!

Hello, GUI

In computing terms, GUI (pronounced as gooey, or Graphical User Interface) is

used to denote a set of interfaces with computing systems that involves user-friendly

images rather than boring text commands. GUI comes to the rescue of the numerous

command-line interfaces that have always been coupled with a steep learning curve

because learning and mastering commands requires a lot of effort due to their

nonintuitive nature. Moreover, GUI layers make it easy for the end users to fulll

their needs without knowing much about the underlying implementation, which is

unnecessary for them.

Chapter 1

[ 3 ]

Every other application in the modern world is designed with interactive graphics

to attract the end users. Simplicity and usability are the two main ingredients for

a successful GUI system. The demanding feature of a GUI is to allow the user to

concentrate on the task at hand. To achieve this, it must serve the interaction between

the human and the computer, and make it no less than seamless and owing.

Therefore, learning to create GUIs will not only make you a successful developer, but

it will also help in getting some revenue for yourself.

At a very basic level, a GUI is seen as a window (visibly noticeable or not) consisting

of the following parts: controls, menu, layout, and interaction. A GUI is represented

as a window on the screen and contains a number of different controls, as follows:

• Controls: These can, for example, be labels, buttons or text boxes.

• Menu: This is usually situated under the top frame of the GUI window and

presents to the users some choices to control the application. The top frame

can also have buttons to hide, resize, or destroy the windows, which are,

again, controls.

• Layout: This is the way that the controls are positioned, which is very

important in good GUI design.

• Interaction: This happens in the way of I/O devices, such as a mouse and

keyboard.

Development of a GUI application revolves around dening and controlling these

components, and designing the area of interaction is the most challenging part of

all. The correct exploitation of events, listeners, and handlers will help in developing

better GUI applications. Many frameworks have been developed to support GUI

development, such as the Model-View-Controller framework that is used in many

web-based applications. Using some of these frameworks can make the GUI

programming easier and will come in handy for future implementations. A good

user-interface design relates to the user, not to the system architecture.

Usually, GUIs are characterized by 2W's, namely WIMP and WYSIWYG.

They are acronyms for Windows, Icons, Menus, Pointing devices (mouse,

joystick, and so on) and What You See Is What You Get.

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