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import EmitterMixin from '../common/EmitterMixin'
/*
An abstraction for a dragging interaction originating on an event.
Does higher-level things than PointerDragger, such as possibly:
- a "mirror" that moves with the pointer
- a minimum number of pixels or other criteria for a true drag to begin
subclasses must emit:
- pointerdown
- dragstart
- dragmove
- pointerup
- dragend
*/
export default abstract class ElementDragging { // TODO: rename to *Interface?
emitter: EmitterMixin
constructor(el: HTMLElement) {
this.emitter = new EmitterMixin()
}
destroy() {
}
// if given true, should prevent dragstart+dragmove+dragend from firing
abstract setIgnoreMove(bool: boolean): void
setMirrorIsVisible(bool: boolean) {
// optional if subclass doesn't want to support a mirror
}
setMirrorNeedsRevert(bool: boolean) {
// optional if subclass doesn't want to support a mirror
}
setAutoScrollEnabled(bool: boolean) {
// optional
}
}
export type ElementDraggingClass = { new(el: HTMLElement): ElementDragging }