The Qt QML module provides the definition and implementation of various convenience types which can be used with the QML language, including some elementary QML types which can provide the basis for further extensions to the QML language. The QtObject and Component object types are non-visual and provide building-blocks for extensions to QML.
类型提供通过
QtQml
module are only available in a QML document if that document imports the
QtQml
namespace (or if the document imports the
QtQuick
namespace, as noted below).
当前版本的
QtQml
module is version 2.2, and thus it may be imported via the following statement:
import QtQml 2.2
Most clients will never need to use the
QtQml
import, as all of the types are also provided by the
QtQuick
namespace which may be imported as follows:
import QtQuick 2.7
见
Qt Quick
module documentation for more information about the
QtQuick
namespace and what it provides to QML application developers.
The QML types for creating lists and models, such as
ListModel
and
ListElement
, are moved to a submodule,
QtQml.Models
。
Qt QML Models
页面有更多信息。
The documentation for the types below applies equally to the types of the same name provided by the Qt Quick module, as they are in fact identical.
下列 QML basic types 有提供：
| date | 日期值 |
| point | 具有 X 和 Y 属性的值 |
| rect | 具有 X、Y、宽度及高度属性的值 |
| size | 具有宽度和高度属性的值 |
下列 QML 对象类型 有提供：
| Date | 提供日期函数 |
| Number | 提供表示数字值的对象 |
| String | 表示字符串值的对象 |
| Component | 封装 QML 组件定义 |
| Qt | 提供带有有用 Qt 枚举和函数的全局对象 |
| QtObject | 基本 QML 类型 |
| Locale | 提供特定区域设置的特性和格式化数据 |
| LoggingCategory | 定义 QML 日志类别 |
| Binding | 使能够创建任意特性绑定 |
| Connections | 描述信号的一般化连接 |
| Instantiator | 动态创建对象 |
| Timer | 按指定间隔触发处理程序 |
