Qt快速应用开发指南：桌面版

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"QtQuickApplicationGuide4Desktop 是一份关于在桌面平台上使用Qt Quick进行应用程序开发的指南，由Nokia发布，适用于Qt Quick 4。该文档涵盖了从原型设计到功能实现，再到动态管理对象和本地数据存储，以及添加动画和提升用户界面体验等多个方面。\n\n1. 关于本指南\n本指南旨在帮助开发者了解为什么选择Qt Quick来构建桌面应用，提供源代码和不同格式的指南获取方式，并鼓励用户参与反馈，共同改进。文档遵循特定的开源许可证。\n\n2. 原型设计与初步设计\n该部分介绍了如何通过QML组件创建用户界面元素，如NoteApp应用的概述。讲解了如何锚定QML项目、实现QML组件，使用Repeater和Delegate创建列表标记，并最终完成原型的构建。\n\n3. 实现UI并添加功能\n这部分深入到页面面板组件的创建，用于管理页面。详细阐述了如何将MarkerItem与Repeater中的PageItem绑定，以及如何添加图形，比较Image和BorderImage元素的使用。\n\n4. 动态管理笔记对象及本地存储\n本章介绍如何动态地创建和管理NoteItem对象，以及如何使用JavaScript操作数据库来存储和加载数据。这对于实现应用的数据持久化至关重要。\n\n5. 添加动画和增强视觉效果\n这部分指导开发者使用Behavior元素为NoteToolbar添加动画效果，同时探讨了如何利用States和Transitions来改变组件状态，提升应用的视觉吸引力和用户体验。\n\nQtQuickApplicationGuide4Desktop是为桌面应用开发者准备的一份全面教程，涵盖了Qt Quick 4在桌面平台上的各个方面，从基础设计到高级功能实现，对于想要深入了解和熟练运用Qt Quick进行桌面应用开发的人来说极具价值。"

Qt Quick Application Developer Guide for Desktop, Release 1.0

The picture above gives us a good idea of what the user expects to see from the UI perspective,

but it also can help you identify possible UI elements and interactions that could be imple-

mented later on.

2.1.2 UI Flows

As mentioned previously, there are three Pages that contain Note items. We can also see the

Marker items on the right side. There is a toolbar on the left in NoteApp. It contains two tools:

the New Note tool for creating new notes and the Clear All for clearing the entire page. The

page markers that enable the user to switch between pages are on the right. Note items have a

toolbar that can be used to drag notes within the page by moving the mouse while holding the

left-click button down. Additionally, there is a delete tool in the note toolbar that enables the

user to delete the note.

What’s Next?

Next we will work on identifying the QML Components needed to implement our features and

learn how to create them.

2.1. Overview of the NoteApp Application 9

Qt Quick Application Developer Guide for Desktop, Release 1.0

2.2 Creating a QML Component for UI Elements

Once we have properly deﬁned the feature-set and UI concepts for the NoteApp application and

we have also identiﬁed basic initial UI elements, we can safely start to implement and prototype

some initial work.

The prototype will be a very basic UI with no functionality whatsoever, but it will provide an

overview of how the application might look when ﬁnished as we go through implementation

iterations.

In this step, you will ﬁnd details about how to create your ﬁrst Qt Quick UI using Qt Creator,

but most importantly, how to identify and create a QML Component.

2.2.1 Creating a Qt Quick UI Project in QtCreator

When working on the prototype phase, it is important to understand that creating a Qt Quick

UI project with Qt Creator is the most recommended and efﬁcient approach. In this way,

prototyping, especially developing and testing each individual QML Component, becomes so

much easier. Testing each newly created component individually is very important as you are

able to spot issues right away and using a Qt Quick UI project makes it easier.

Please refer to the Creating a Qt Quick UI

with QtCreator for details on how to create a project.

Note: There is always a single QML ﬁle that is identiﬁed as the the main ﬁle to load and run

in order to start the application. For NoteApp, we have the main.qml ﬁle, which has in fact been

generated by Qt Creator.

2.2.2 Identifying QML Components as UI Elements

If you want to make an analogy with object oriented programing, then QML Components

could be considered as classes that are used to declare and instantiate objects. You could

potentially write a simple application entirely in one big QML ﬁle, but that would certainly

increase complexity and make code re-usability and maintenance quite difﬁcult - sometimes

even impossible.

QML Component can be identiﬁed as a group of common UI elements. More often, it repre-

sents a single UI element with its predeﬁned actions and properties.

Based on our UI Concept and Design, here is brief list of identiﬁed components that are obvious

at ﬁrst and come naturally in mind, but more will come later on as we go in the next iteration.

Note: Each QML Component sits in its own QML ﬁle (.qml) that has the same name as the

component. For instance, Note component would be in a ﬁle named Note.qml .

• Note - that represents a note item

http://doc.qt.nokia.com/qtcreator-snapshot/quick-projects.html#creating-qt-quick-ui-projects

10 Chapter 2. Prototyping and Initial Design

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Qt快速应用开发指南：桌面版

QtQuickApplicationGuide4Desktop.pdf

NoteApp:QML 指南中的 NoteApp --“QtQuickApplicationGuide4Desktop”，在 Qt 5.3.2 中构建，可以根据需要运行

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