gradum-kit - v0.1.0
    Preparing search index...

    Class GradumWheelEvent

    GradumWheelEvent

    The event fired for gradum-scroll and gradum-pinch. Wheel events carry no pointer position, so GradumEvent.position is null — read GradumWheelEvent.delta instead.

    Hierarchy (View Summary)

    Index
    constructor
    eventManager toolName eventName clickMode inputDevice keys position authorizeScaling scalePosition delta
    tool target scaledPosition scalingAuthorized
    closest scalePositionsMap
    eventManager: GradumEventManager

    The event manager that fired this event.

    toolName: string

    The name of the tool this event is attributed to, or undefined when no tool was current. Resolve it to the tool itself with GradumEvent.tool.

    eventName: GradumEventNameEntry

    The name this event was dispatched under, such as gradum-click.

    clickMode: ClickMode

    The pointer button or input mode this event belongs to.

    inputDevice: InputDevice

    The device that produced this event.

    keys: string[]

    The keys held down when the event fired.

    position: Point

    The screen position the event was fired from.

    authorizeScaling: boolean | (() => boolean)

    Whether GradumEvent.scaledPosition and its per-pointer equivalents actually scale, or hand back the raw position. Assign a callback to decide per read — useful when a canvas is only sometimes transformed. Defaults to true.

    scalePosition: (position: Point) => Point

    How a screen position is mapped into document space. Assign it to make events aware of a panned or zoomed canvas. Defaults to returning the position unchanged.

    delta: Point

    How far the wheel or trackpad moved on each axis since the last event.

    • get tool(): Node

      Returns Node

      The tool associated with this event, or null if the event carries no tool name.

    • get target(): Element | Document

      Returns Element | Document

      The element the event was fired on, or the document when there is no element target.

    • get scaledPosition(): Point

      Returns Point

      The event position in document space, obtained by running GradumEvent.position through scalePosition. Falls back to the raw position when scaling is not authorized.

    • get scalingAuthorized(): boolean

      Returns boolean

      Whether scaled positions are computed for this event. Resolves authorizeScaling, calling it first if it is a callback.

    • Function

      closest

      Type Parameters

      • T extends Element

        The type of element to look for.

      Parameters

      • type: new (...args: any[]) => T

        The constructor to match against.

      • Optionalstrict: boolean | Element

        When true, the match must also contain the event position, so an ancestor the pointer has left is rejected. Pass an Element to test against that element's bounds instead, or false to skip the check.

      • Optionalfrom: ClosestOrigin

        Where to start searching from.

      Returns T

      The nearest matching element, or null if there is none.

      Find the nearest element of the given class, starting from the event target or the event position and walking up. Matching is by instanceof.

    • Function

      closest

      Parameters

      • type: string

        A custom-element tag name, or a CSS selector.

      • Optionalstrict: boolean | Element

        When true, the match must also contain the event position. Pass an Element to test against that element's bounds instead, or false to skip it.

      • Optionalfrom: ClosestOrigin

        Where to start searching from.

      Returns Element

      The nearest matching element, or null if there is none.

      Find the nearest element matching the given string. A registered custom-element tag such as "my-component" is resolved to its constructor and matched by instanceof; anything else is treated as a CSS selector.

    • Protected Function

      scalePositionsMap

      Parameters

      • Optionalpositions: GradumMap<number, Point>

        Positions keyed by pointer id.

      Returns GradumMap<number, Point>

      A new map with each position scaled. The input is unchanged.

      Map every point in a per-pointer map into document space. Used by GradumDragEvent to expose scaled variants of its position maps.

    Settings
    Member Visibility

    On This Page
    Constructors
    Properties
    Accessors
    Methods