Class EmptyComposedBackendContext

constructor

• new EmptyComposedBackendContext(): EmptyComposedBackendContext

• Returns EmptyComposedBackendContext

mode

appendStyleSheetPath

• appendStyleSheetPath(_path, _styleScope?): number

• Insert a style sheet item whose content comes from the specified path. styleScope is an optional scope identifier. Returns the new style sheet index. If styleScope is not a positive integer, it is treated as empty (globally effective).

  Parameters

  • _path: string
  • Optional _styleScope: number

  Returns number

createElement

• createElement(_tagName, _stylingName): EmptyComposedBackendElement

• Create a normal node. Composed Mode only.

  Parameters

  • _tagName: string

    The node's own defined name.
  • _stylingName: string

    The alias set when used.

  Returns EmptyComposedBackendElement

createFragment

• createFragment(): EmptyComposedBackendElement

• Create a fragment node. Used to represent a node array for batch insertion and removal.

  Returns EmptyComposedBackendElement

createMediaQueryObserver

• createMediaQueryObserver(_status, _listener): Observer

• Parameters

  • _status: MediaQueryStatus
  • _listener: ((res) => void)
    • • (res): void

      • Parameters

        • res: {
              matches: boolean;
          }

          • matches: boolean

        Returns void

  Returns Observer

createTextNode

• createTextNode(_tagName): EmptyComposedBackendElement

• Create a text node. Composed Mode only.

  Parameters

  • _tagName: string

  Returns EmptyComposedBackendElement

destroy

• destroy(): void

• Destroy this Context instance. glass-easel does not call this directly; other modules should call it.

  Returns void

disableStyleSheet

• disableStyleSheet(_index): void

• Disable an inserted style sheet.

  Parameters

  • _index: number

  Returns void

getDevicePixelRatio

• getDevicePixelRatio(): number

• Get the device pixel ratio of this Context.

  Returns number

getRootNode

• getRootNode(): EmptyComposedBackendElement

• Get the root node. In Composed Mode, the root node must be a normal node.

  Returns EmptyComposedBackendElement

getTheme

• getTheme(): string

• Get the current theme of this Context, typically "light" or "dark".

  Returns string

getWindowHeight

• getWindowHeight(): number

• Get the display area height of this Context.

  Returns number

getWindowWidth

• getWindowWidth(): number

• Get the display area width of this Context.

  Returns number

onEvent

• onEvent(_listener): void

• Set the global event callback. This callback is the only one. Composed Mode only; for Shadow Mode see the other onEvent signature.

  Parameters

  • _listener: ((element, type, detail, options, target) => EventBubbleStatus)

    Called when an event occurs.

    • • (element, type, detail, options, target): EventBubbleStatus

      • Parameters

        • element: glassEasel.Element
        • type: string
        • detail: unknown
        • options: EventOptions
        • target: EmptyComposedBackendElement

        Returns EventBubbleStatus

  Returns void

registerStyleSheetContent

• registerStyleSheetContent(_path, _content): void

• Register a style sheet. path is the style sheet path, content is the corresponding CSS style sheet in a format the backend can interpret. If the CSS contains @import or similar references, the referenced content may also be registered via another registerStyleSheetContent call, either before or after this one.

  Parameters

  • _path: string
  • _content: unknown

  Returns void

render

• render(cb): void

• Wait for the next render to complete (align with the backend vsync). The backend must ensure the callback is asynchronous. Setting new properties inside the callback should trigger CSS transitions.

  Parameters

  • cb: ((err) => void)
    • • (err): void

      • Parameters

        • err: null | Error

        Returns void

  Returns void