Class TouchBackendImpl

packages/backend-touch/src/TouchBackendImpl.ts:45–629

}

export class TouchBackendImpl implements Backend {
	private options: OptionsReader

	// React-DnD Dependencies
	private actions: DragDropActions
	private monitor: DragDropMonitor

	// Internal State
	private static isSetUp: boolean
	public sourceNodes: Map<Identifier, HTMLElement>
	public sourcePreviewNodes: Map<string, HTMLElement>
	public sourcePreviewNodeOptions: Map<string, any>
	public targetNodes: Map<string, HTMLElement>
	private _mouseClientOffset: Partial<XYCoord>
	private _isScrolling: boolean
	private listenerTypes: ListenerType[]
	private moveStartSourceIds: string[] | undefined
	private waitingForDelay: boolean | undefined
	private timeout: ReturnType<typeof setTimeout> | undefined
	private dragOverTargetIds: string[] | undefined
	private draggedSourceNode: HTMLElement | undefined
	private draggedSourceNodeRemovalObserver: MutationObserver | undefined

	// Patch for iOS 13, discussion over #1585
	private lastTargetTouchFallback: Touch | undefined

	public constructor(
		manager: DragDropManager,
		context: TouchBackendContext,
		options: Partial<TouchBackendOptions>,
	) {
		this.options = new OptionsReader(options, context)
		this.actions = manager.getActions()
		this.monitor = manager.getMonitor()

		this.sourceNodes = new Map()
		this.sourcePreviewNodes = new Map()
		this.sourcePreviewNodeOptions = new Map()
		this.targetNodes = new Map()
		this.listenerTypes = []
		this._mouseClientOffset = {}
		this._isScrolling = false

		if (this.options.enableMouseEvents) {
			this.listenerTypes.push(ListenerType.mouse)
		}

		if (this.options.enableTouchEvents) {
			this.listenerTypes.push(ListenerType.touch)
		}

		if (this.options.enableKeyboardEvents) {
			this.listenerTypes.push(ListenerType.keyboard)
		}
	}

	/**
	 * Generate profiling statistics for the HTML5Backend.