Class EmptyBackendContext

constructor

• new EmptyBackendContext(): EmptyBackendContext

• Returns EmptyBackendContext

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

createFragment

• createFragment(): EmptyBackendElement

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

  Returns EmptyBackendElement

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(): EmptyBackendShadowRootContext

• Get the root node. In Shadow Mode, the root node must be a component root node.

  Returns EmptyBackendShadowRootContext

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(_createEvent, _listener): void

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

  Parameters

  • _createEvent: ((type, detail, options) => Event<unknown>)

    Creates an event object from the given type, detail, and options.

    • • (type, detail, options): Event<unknown>

      • Parameters

        • type: string
        • detail: unknown
        • options: EventOptions

        Returns Event<unknown>

  • _listener: ((event, currentTarget, mark, target, isCapture) => EventBubbleStatus)

    Called when an event occurs.

    • • (event, currentTarget, mark, target, isCapture): EventBubbleStatus

      • Parameters

        • event: Event<unknown>
        • currentTarget: glassEasel.Element
        • mark: null | Record<string, unknown>
        • target: glassEasel.Element
        • isCapture: boolean

        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