qtsd-fork/example/node_modules/dnd-core/lib/reducers/dragOffset.js

Do not use this please

'use strict';

Object.defineProperty(exports, "__esModule", {
	value: true
});

var _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; };

exports.default = dragOffset;
exports.getSourceClientOffset = getSourceClientOffset;
exports.getDifferenceFromInitialOffset = getDifferenceFromInitialOffset;

var _dragDrop = require('../actions/dragDrop');

var initialState = {
	initialSourceClientOffset: null,
	initialClientOffset: null,
	clientOffset: null
};

function areOffsetsEqual(offsetA, offsetB) {
	if (offsetA === offsetB) {
		return true;
	}
	return offsetA && offsetB && offsetA.x === offsetB.x && offsetA.y === offsetB.y;
}

function dragOffset() {
	var state = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : initialState;
	var action = arguments[1];

	switch (action.type) {
		case _dragDrop.BEGIN_DRAG:
			return {
				initialSourceClientOffset: action.sourceClientOffset,
				initialClientOffset: action.clientOffset,
				clientOffset: action.clientOffset
			};
		case _dragDrop.HOVER:
			if (areOffsetsEqual(state.clientOffset, action.clientOffset)) {
				return state;
			}
			return _extends({}, state, {
				clientOffset: action.clientOffset
			});
		case _dragDrop.END_DRAG:
		case _dragDrop.DROP:
			return initialState;
		default:
			return state;
	}
}

function getSourceClientOffset(state) {
	var clientOffset = state.clientOffset,
	    initialClientOffset = state.initialClientOffset,
	    initialSourceClientOffset = state.initialSourceClientOffset;

	if (!clientOffset || !initialClientOffset || !initialSourceClientOffset) {
		return null;
	}
	return {
		x: clientOffset.x + initialSourceClientOffset.x - initialClientOffset.x,
		y: clientOffset.y + initialSourceClientOffset.y - initialClientOffset.y
	};
}

function getDifferenceFromInitialOffset(state) {
	var clientOffset = state.clientOffset,
	    initialClientOffset = state.initialClientOffset;

	if (!clientOffset || !initialClientOffset) {
		return null;
	}
	return {
		x: clientOffset.x - initialClientOffset.x,
		y: clientOffset.y - initialClientOffset.y
	};
}