Learn-QML
所属分类：collect
开发工具：QML
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上传日期：2021-11-25 03:25:00
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sh-1993
说明： 一个存储库，用于展示我对QML编程语言的知识，并继续学习该语言。，
(A repository for showcasing my knowledge of the QML programming language, and continuing to learn the language.,)
文件列表:
.editorconfig (1327, 2021-11-24)
AUTHORS (272, 2021-11-24)
CONTRIBUTING.md (244762, 2021-11-24)
COPYINGL (1364, 2021-11-24)
CREDITS (696, 2021-11-24)
DRM-free_label.en.svg (5829, 2021-11-24)
INSTALL (1237, 2021-11-24)
... ...
***
### Learning QML
I am not too experienced with QML at the moment. This document will go over my knowledge of the QT Modeling Language (QML) so far.
#### Importing libraries in QML
I only know 1 library that needs to be imported, I don't know if it is mandatory for QML.
##### QtQuick 2.9 library in QML
```qml
import QtQuick 2.9 // import from Qt 5.9
```
#### Comments in QML
Comments in QML are the same as comments in languages such as C, C++, CSS, Java, and Go.
```qml
// This is a single line comment
/* This is
a multi-
line
comment */
/* This is
* also a
* multi-
* line
* comment */
```
#### Break keyword in QML
```qml
break
```
To this day, I am still not entirely sure what the `break` keyword does, but most languages support it.
_/!\ This example has not been tested yet, and may not work_
#### Hello World in QML
A hello world program in QML is pretty simple. It uses this weird keyword known as `qsTr` which I don't know what it stands for. This example is likely broken.
```qml
helloWorld: qsTr("Hello world")
```
_/!\ This example has not been tested yet, and may not work_
#### Defining shapes in QML
##### Rectangles in QML
This is how you make a rectangle in QML:
```qml
Rectangle {
id: myRect
width: 120
height: 100
}
```
_/!\ This example has not been tested yet, and may not work_
However, it may require nesting in another object, so I can confirm the next example works:
```qml
Item {
Rectangle {
id: myRect
width: 120
height: 100
}
Rectangle {
width: myRect.width
height: 200
}
}
```
This example was taken from Wikipedia/QML (revision: [1000315038](https://github.comhttps://en.wikipedia.org/w/index.php?title=QML&oldid=1000315038) main article: [link](https://github.comhttps://en.wikipedia.org/wiki/QML))
#### Images in QML
This example comes from Wikipedia.
```qml
import QtQuick 2.9 // import from Qt 5.9
Rectangle {
id: canvas
width: 250
height: 200
color: "blue"
Image {
id: logo
source: "pics/logo.png"
anchors.centerIn: parent
x: canvas.height / 5
}
}
```
This example was taken from Wikipedia/QML (revision: [1000315038](https://github.comhttps://en.wikipedia.org/w/index.php?title=QML&oldid=1000315038) main article: [link](https://github.comhttps://en.wikipedia.org/wiki/QML))
#### Other knowledge of QML
1. QML is a curly bracket language, but does not use semicolons at the end of each line
2. QML is a modeling language, more of a stylesheet language than a functional one (need confirmation)
3. QML is short for **Q**T **M**odeling **L**anguage
4. QML is designed for the QT framework
5. QML is in use by many Linux projects, including KDE, Tizen, etc.
6. QT has a restrictive license, and is a bit problematic
7. QML uses the `.qml` file extension
8. No other knowledge of QML at the moment.
***
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