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The OpenHarmony JS UI framework provides basic, container, and canvas UI components and standard CSS animation capabilities. It supports the web-development-like programming paradigm.
The JS UI framework consists of the application, framework, engine, and porting layers.
Parses UI pages and provides the Model-View-ViewModel (MVVM), page routing, custom components and more for front end development.
Accomplishes animation parsing, Document Object Model (DOM) building, layout computing, rendering command building and drawing, and event management.
Abstracts the platform layer to provide abstract interfaces to connect to the platform. For example, event interconnection, rendering pipeline interconnection, and lifecycle interconnection.
The source code of the framework is stored in /foundation/ace/ace_engine. The following shows the directory structure.
/foundation/ace/ace_engine ├── adapter # Platform adaptation code │ ├── common │ └── ohos ├── frameworks # Framework code │ ├── base # Basic libraries │ ├── bridge # Bridging layer for frontend and backend components │ └── core # Core components
JS UI framework provides various UI components with rich functionalities and style definitions. You can use and reuse any component anywhere as needed. You can customize new components by combining existing ones to simplify development.
Table 1 Components provided by the framework
button, text, input, label, image, progress, rating, span, marquee, image-animator, divider, menu, chart, option, picker, picker-view, piece, qrcode, select, slider, switch, toolbar, toolbar-item, toggle
JS UI framework