掌握PySide 2：开发动态跨平台GUI应用全攻略

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"《Pyside GUI Application Development (2nd Edition, 2016)》是一本由GoPinath Jaganmohan和Venkateshwaran Loganathan合著的专业书籍，由Packt Publishing出版。该书专为Python开发者设计，旨在帮助他们利用开源跨平台用户界面框架PySide创建动态且健壮的图形用户界面（GUI）应用。PySide结合了Qt框架的威力与Python的易用性，为Python开发者提供了访问Qt的强大工具，并作为一个优秀的快速应用程序开发平台。本书分为多个章节，首先引导读者安装和配置PySide，以便在不同操作系统如Windows、Linux和Mac OS上运行。接着，作者会深入讲解GUI编程的基础知识，包括事件管理、信号与槽机制，以及PySide提供的各种控件和对话框的使用。书中还涵盖了数据库交互和数据处理的内容，让开发者能够熟练地构建应用程序并与数据进行高效互动。通过阅读本书，读者不仅能掌握如何高效编写GUI程序，还能学会如何创建自己的应用程序，并确保它们能够在不同平台上无缝运行。值得注意的是，版权方面，所有内容未经Packt Publishing的书面许可不得复制或传播，且书中的信息虽已尽最大努力确保准确性，但并不保证无误，且作者和出版商不对因本书产生的直接或间接损失负责。此外，书中还包含了关于书中提及的所有公司和产品的商标信息，展示了Packt Publishing在尊重知识产权方面的专业态度。《Pyside GUI Application Development (2nd Edition, 2016)》是一本实用且全面的指南，是任何希望提升Python GUI开发技能的开发者的宝贵资源。"

Preface

[ vii ]

Any command-line input or output is written as follows:

brew install pyside

port-install pyXX-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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