coherent-gameface-interaction-manager
Version:
Library for the most common UI interactions
785 lines (784 loc) • 30.7 kB
JavaScript
(function(global, factory) {
typeof exports === "object" && typeof module !== "undefined" ? module.exports = factory() : typeof define === "function" && define.amd ? define(factory) : (global = typeof globalThis !== "undefined" ? globalThis : global || self, global.dropzone = factory());
})(this, (function() {
"use strict";
class DragBase {
constructor(options) {
this.options = options;
this.draggableElements = [];
this.draggedElement = null;
this.enabled = false;
this.offset = { x: 0, y: 0 };
}
/**
* Get the index of the dragged item in the draggableElements
*/
get draggedItemIndex() {
return [...this.draggableElements].indexOf(this.draggedElement);
}
/**
* Gets the body scroll offset to calculate in the dragging
*/
get bodyScrollOffset() {
return {
x: document.body.scrollLeft,
y: document.body.scrollTop
};
}
setPointerOffset(clientX, clientY, target) {
const { x, y } = target.getBoundingClientRect();
this.offset = {
x: clientX - x,
y: clientY - y
};
}
}
function toDeg(rad) {
return rad * 180 / Math.PI;
}
function createHash() {
return (Math.random() + 1).toString(36).substring(7);
}
function distanceBetweenTwoPoints(x1, y1, x2, y2) {
const a = x1 - x2;
const b = y1 - y2;
return Math.hypot(a, b);
}
function getMidPoint(x1, y1, x2, y2) {
return {
x: (x1 + x2) / 2,
y: (y1 + y2) / 2
};
}
class IM {
constructor() {
this.actions = [];
this.keyboardFunctions = [];
this.gamepadFunctions = [];
}
/**
* Initialize global object
*/
init() {
if (!window._IM) window._IM = new IM();
}
/**
* Get keyboard functions matching the given keys
*/
getKeys(keys) {
return _IM.keyboardFunctions.filter((keyFunction) => keyFunction.keys.every((key) => keys.includes(key)));
}
/**
* Get the index of a keyboard function matching the given keys
*/
getKeysIndex(keys) {
return _IM.keyboardFunctions.findIndex((keyFunction) => keyFunction.keys.every((key) => keys.includes(key)));
}
/**
* Get a gamepad function matching the given button actions and type
*/
getGamepadAction({ actions: actions2, type }) {
return _IM.gamepadFunctions.find((gpFunc) => {
return gpFunc.actions.every((action) => actions2.includes(action)) && gpFunc.type === type && gpFunc.actions.length === actions2.length;
});
}
/**
* Get all gamepad functions matching the given button actions
*/
getGamepadActions(actions2, exactMatch = true) {
return _IM.gamepadFunctions.filter(
(gpFunc) => gpFunc.actions.every((action) => actions2.includes(action)) && (exactMatch ? gpFunc.actions.length === actions2.length : true)
);
}
/**
* Get the index of a gamepad function matching the given button actions
*/
getGamepadActionIndex(actions2) {
return _IM.gamepadFunctions.findIndex((gpFunc) => gpFunc.actions.every((action) => actions2.includes(action)));
}
/**
* Get an action by name
* @param {string} action - Action to search for
*/
getAction(action) {
return _IM.actions.find((actionObj) => actionObj.name === action);
}
/**
* Get the index of an action by name
*/
getActionIndex(action) {
return _IM.actions.findIndex((actionObj) => actionObj.name === action);
}
/**
* Checks if a callback already exists in a registered function entry
*/
hasDuplicateCallback(functionEntry, callback) {
return functionEntry.callbacks.some((cb) => cb === callback);
}
/**
* Adds a callback to an existing function entry if it's not a duplicate
* @param {KeyboardFunction | GamepadFunction} functionEntry - The function entry to add the callback to
* @param {Function | string} callback - The callback to add
* @param {Object} errorContext - Context information for error messages
* @param {string} errorContext.identifier - String identifying the keys/actions (e.g., "Keys: [A, B]")
* @param {string} errorContext.type - The type of action (press, hold, lift)
*/
addCallbackToEntry(functionEntry, callback, errorContext) {
if (this.hasDuplicateCallback(functionEntry, callback)) {
const callbackType = typeof callback === "string" ? "action" : "function";
const callbackName = typeof callback === "string" ? callback : "(anonymous function)";
return console.error(
`Duplicate callback detected!
${errorContext.identifier}
Type: '${errorContext.type}'
Callback: ${callbackName}
This ${callbackType} is already registered for this combination and type. To update it, first remove with the .off() method.`
);
}
return functionEntry.callbacks.push(callback);
}
/**
* Removes a keyboard function entry from the registry
*/
removeKeyboardFunction(functionEntry) {
const index = _IM.keyboardFunctions.indexOf(functionEntry);
if (index !== -1) _IM.keyboardFunctions.splice(index, 1);
}
/**
* Removes a gamepad function entry from the registry
*/
removeGamepadFunction(functionEntry) {
const index = _IM.gamepadFunctions.indexOf(functionEntry);
if (index !== -1) _IM.gamepadFunctions.splice(index, 1);
}
}
const IM$1 = new IM();
class Actions {
/**
* Register an action
*/
register(action, callback) {
if (IM$1.getAction(action)) return console.error(`The following action "${action}" is already registered!`);
_IM.actions.push({ name: action, callback });
}
/**
* Remove a registered action
*/
remove(action) {
const actionIndex = IM$1.getActionIndex(action);
if (actionIndex === -1) return console.error(`${action} is not a registered action!`);
_IM.actions.splice(actionIndex, 1);
}
/**
* Trigger an action
*/
execute(action, value) {
const actionObject = IM$1.getAction(action);
if (!actionObject) return console.error(`${action} is not a registered action!`);
actionObject.callback(value);
}
}
const actions = new Actions();
function getDirection(diffX, diffY) {
const MIN_SWIPE_OFFSET = 200;
if (diffY < 0 && diffX > -MIN_SWIPE_OFFSET && diffX < MIN_SWIPE_OFFSET) return "top";
if (diffY > 0 && diffX > -MIN_SWIPE_OFFSET && diffX < MIN_SWIPE_OFFSET) return "bottom";
if (diffX < 0 && diffY > -MIN_SWIPE_OFFSET && diffY < MIN_SWIPE_OFFSET) return "left";
if (diffX > 0 && diffY > -MIN_SWIPE_OFFSET && diffY < MIN_SWIPE_OFFSET) return "right";
if (diffX <= -MIN_SWIPE_OFFSET && diffY <= -MIN_SWIPE_OFFSET) return "top-left";
if (diffX >= MIN_SWIPE_OFFSET && diffY <= -MIN_SWIPE_OFFSET) return "top-right";
if (diffX <= -MIN_SWIPE_OFFSET && diffY >= MIN_SWIPE_OFFSET) return "bottom-left";
if (diffX >= MIN_SWIPE_OFFSET && diffY >= MIN_SWIPE_OFFSET) return "bottom-right";
}
function getElement(element) {
return element instanceof HTMLElement ? element : document.querySelector(element);
}
const MULTIPLE_TOUCHES_MIN_NUMBER = 2;
class TouchGestures {
constructor() {
this.activeTouches = /* @__PURE__ */ new Map();
}
/**
* Hold gesture - triggers after holding for specified time
* @param {Object} options
* @param {HTMLElement | string} options.element - Element you want to attach the touch event to
* @param {function} options.callback - Function to be executed on touch
* @param {number} [options.time=1000] - Time in milliseconds for the press
*/
hold(options) {
if (!options) return console.error("Options not provided for hold!");
let holdTimer;
const element = getElement(options.element);
if (!element) return console.error("Element not found!");
const onHold = ({ touches }) => {
this.activeTouches.set(touches[0].identifier, touches[0]);
holdTimer = setTimeout(() => {
if (!options.callback) return;
options.callback();
}, options.time || 1e3);
};
const onHoldEnd = ({ touches }) => {
this.activeTouches.delete(touches[0].identifier);
clearTimeout(holdTimer);
};
element.addEventListener("touchstart", onHold);
element.addEventListener("touchend", onHoldEnd);
return {
/**
* Removes the event listeners
*/
remove() {
element.removeEventListener("touchstart", onHold);
element.removeEventListener("touchend", onHoldEnd);
}
};
}
/**
* Tap gesture - single or multi-tap detection
* @param {Object} options
* @param {HTMLElement | string} options.element - Element you want to attach the touch event to
* @param {function} options.callback - Function to be executed on touch
* @param {number} [options.tapsNumber=1] - Number of taps necessary for the callback to be executed
* @param {number} [options.tapTime=200] - Time in milliseconds between putting down the finger and lifting it up
* @param {number} [options.betweenTapsTime=500] - Time in milliseconds between two sequential taps
*/
tap(options) {
if (!options) return console.error("Options not provided for tap!");
let tapTimer, betweenTapsTimer;
let isTap = true;
let tapCount = options.tapsNumber || 1;
const element = getElement(options.element);
if (!element) return console.error("Element not found!");
const onTap = ({ touches }) => {
this.activeTouches.set(touches[0].identifier, touches[0]);
clearTimeout(betweenTapsTimer);
isTap = true;
tapTimer = setTimeout(() => {
isTap = false;
}, options.tapTime || 200);
};
const onTapEnd = ({ touches }) => {
this.activeTouches.delete(touches[0].identifier);
clearTimeout(tapTimer);
if (!isTap) return;
tapCount--;
betweenTapsTimer = setTimeout(() => {
tapCount = options.tapsNumber || 1;
clearTimeout(betweenTapsTimer);
}, options.betweenTapsTime || 500);
if (tapCount !== 0 || !options.callback) return;
options.callback();
isTap = true;
clearTimeout(tapTimer);
tapCount = options.tapsNumber || 1;
};
element.addEventListener("touchstart", onTap);
element.addEventListener("touchend", onTapEnd);
return {
/**
* Removes the event listeners
*/
remove() {
element.removeEventListener("touchstart", onTap);
element.removeEventListener("touchend", onTapEnd);
}
};
}
/**
* Drag gesture - tracks touch movement
* @param {Object} options
* @param {HTMLElement | string} options.element - Element you want to attach the touch event to
* @param {function} options.onDragStart - Function to be executed on drag start
* @param {function} options.onDrag - Function to be executed on drag
* @param {function} options.onDragEnd - Function to be executed on drag end
*/
drag(options) {
if (!options) return console.error("Options not provided for drag!");
const element = getElement(options.element);
if (!element) return console.error("Element not found!");
const onDragStart = ({ touches, target, currentTarget }) => {
this.activeTouches.set(touches[0].identifier, touches[0]);
document.addEventListener("touchmove", onDrag);
document.addEventListener("touchend", onDragEnd);
if (!options.onDragStart) return;
options.onDragStart({ x: touches[0].clientX, y: touches[0].clientY, target, currentTarget });
};
const onDrag = ({ touches }) => {
if (!this.activeTouches.has(touches[0].identifier)) return;
if (!options.onDrag) return;
options.onDrag({ x: touches[0].clientX, y: touches[0].clientY });
};
const onDragEnd = ({ touches }) => {
this.activeTouches.delete(touches[0].identifier);
document.removeEventListener("touchmove", onDrag);
document.removeEventListener("touchend", onDragEnd);
if (!options.onDragEnd) return;
options.onDragEnd({ x: touches[0].clientX, y: touches[0].clientY });
};
element.addEventListener("touchstart", onDragStart);
return {
/**
* Removes the event listeners
*/
remove() {
element.removeEventListener("touchstart", onDragStart);
}
};
}
/**
* Swipe gesture - detects directional swipes
* @param {Object} options
* @param {HTMLElement | string} options.element - Element you want to attach the touch event to
* @param {function} options.callback - Function to be executed on touch- Directions of the swipe
* @param {number} options.touchNumber - Number of fingers necessary for the swipe
*/
swipe(options) {
if (!options) return console.error("Options not provided for swipe!");
let swipeTimer;
let direction;
let distance;
let isSwipe = true;
const SWIPE_MIN_DISTANCE = 100;
options.touchNumber ||= 1;
const element = getElement(options.element);
if (!element) return console.error("Element not found!");
const onSwipeStart = ({ touches }) => {
this.activeTouches.set(touches[0].identifier, touches[0]);
if (this.activeTouches.size > options.touchNumber) {
document.removeEventListener("touchmove", onSwipe);
document.removeEventListener("touchend", onSwipeEnd);
}
if (this.activeTouches.size !== options.touchNumber) return;
swipeTimer = setTimeout(() => {
isSwipe = false;
clearTimeout(swipeTimer);
swipeTimer = null;
}, 1e3);
document.addEventListener("touchmove", onSwipe);
document.addEventListener("touchend", onSwipeEnd);
};
const onSwipe = ({ touches }) => {
if (!this.activeTouches.has(touches[0].identifier)) return;
const startTouch = this.activeTouches.get(touches[0].identifier);
if (!startTouch) return;
const { clientX: startX, clientY: startY } = startTouch;
const diffX = touches[0].clientX - startX;
const diffY = touches[0].clientY - startY;
direction = getDirection(diffX, diffY);
distance = distanceBetweenTwoPoints(startX, startY, touches[0].clientX, touches[0].clientY);
};
const onSwipeEnd = ({ touches }) => {
this.activeTouches.delete(touches[0].identifier);
if (this.activeTouches.size !== 0) return;
document.removeEventListener("touchmove", onSwipe);
document.removeEventListener("touchend", onSwipeEnd);
if (isSwipeComplete()) {
options.callback(direction);
}
clearTimeout(swipeTimer);
isSwipe = true;
swipeTimer = null;
};
const isSwipeComplete = () => {
return isSwipe && direction && distance && distance > SWIPE_MIN_DISTANCE;
};
element.addEventListener("touchstart", onSwipeStart);
return {
/**
* Removes the event listeners
*/
remove() {
element.removeEventListener("touchstart", onSwipeStart);
}
};
}
/**
* Pinch gesture - two-finger pinch zoom
* @param {Object} options
* @param {HTMLElement | string} options.element - Element you want to attach the touch event to
* @param {function} options.callback - Function to be executed on touch
*/
pinch(options) {
if (!options) return console.error("Options not provided for pinch!");
let distance;
const PINCH_DELTA_NUMBER = 40;
const element = getElement(options.element);
if (!element) return console.error("Element not found!");
const onPinchStart = ({ touches }) => {
this.activeTouches.set(touches[0].identifier, touches[0]);
if (this.activeTouches.size < MULTIPLE_TOUCHES_MIN_NUMBER) return;
const touch0 = this.activeTouches.get(0);
const touch1 = this.activeTouches.get(1);
if (!touch0 || !touch1) return;
document.addEventListener("touchmove", onPinch);
document.addEventListener("touchend", onPinchEnd);
distance = distanceBetweenTwoPoints(
touch0.clientX,
touch0.clientY,
touch1.clientX,
touch1.clientY
);
};
const onPinch = ({ touches }) => {
if (this.activeTouches.size !== MULTIPLE_TOUCHES_MIN_NUMBER) return;
this.activeTouches.set(touches[0].identifier, touches[0]);
const touch1 = this.activeTouches.get(0);
const touch2 = this.activeTouches.get(1);
if (!touch1 || !touch2) return;
const newDistance = distanceBetweenTwoPoints(
touch1.clientX,
touch1.clientY,
touch2.clientX,
touch2.clientY
);
const pinchDelta = Math.sign(newDistance - distance) * PINCH_DELTA_NUMBER;
distance = newDistance;
const midpoint = getMidPoint(
touch1.clientX,
touch1.clientY,
touch2.clientX,
touch2.clientY
);
if (options.callback) options.callback({ pinchDelta, midpoint });
};
const onPinchEnd = ({ touches }) => {
this.activeTouches.delete(touches[0].identifier);
if (this.activeTouches.size !== 0) return;
document.removeEventListener("touchmove", onPinch);
document.removeEventListener("touchend", onPinchEnd);
};
element.addEventListener("touchstart", onPinchStart);
return {
/**
* Removes the event listeners
*/
remove() {
element.removeEventListener("touchstart", onPinchStart);
}
};
}
/**
*
* @param {Object} options
* @param {HTMLElement | string} options.element - Element you want to attach the touch event to
* @param {function} options.callback - Function to be executed on touch
*/
rotate(options) {
if (!options) return console.error("Options not provided for rotate!");
let angle = 0;
let initialAngle = 0;
const element = getElement(options.element);
if (!element) return console.error("Element not found!");
const onRotate = ({ touches }) => {
if (this.activeTouches.size < MULTIPLE_TOUCHES_MIN_NUMBER) return;
this.activeTouches.set(touches[0].identifier, touches[0]);
angle = getAngle() - initialAngle;
if (options.callback) options.callback(angle);
};
const onRotateStart = ({ touches }) => {
this.activeTouches.set(touches[0].identifier, touches[0]);
if (this.activeTouches.size !== MULTIPLE_TOUCHES_MIN_NUMBER) return;
initialAngle = getAngle() - angle;
document.addEventListener("touchmove", onRotate);
document.addEventListener("touchend", onRotateEnd);
};
const onRotateEnd = ({ touches }) => {
this.activeTouches.delete(touches[0].identifier);
document.removeEventListener("touchmove", onRotate);
document.removeEventListener("touchend", onRotateEnd);
};
element.addEventListener("touchstart", onRotateStart);
const getAngle = () => {
const fullRotation = 360;
const rotationOffset = 90;
const offsetY = this.activeTouches.get(0).clientY - this.activeTouches.get(1).clientY;
const offsetX = this.activeTouches.get(0).clientX - this.activeTouches.get(1).clientX;
return (toDeg(Math.atan2(offsetY, offsetX)) + fullRotation + rotationOffset) % fullRotation;
};
return {
/**
* Removes the event listeners
*/
remove() {
element.removeEventListener("touchstart", onRotateStart);
}
};
}
}
const touchGestures = new TouchGestures();
class Dropzone extends DragBase {
constructor(options) {
super(options);
this.dropzones = [];
this.draggedOver = null;
this.touchEvents = [];
this._touchEnabled = false;
this.options = options;
const hash = createHash();
this.actionName = `drag-and-drop-${hash}`;
this.automaticAction = `move-to-${hash}`;
this.onMouseDown = this.onMouseDown.bind(this);
this.onMouseMove = this.onMouseMove.bind(this);
this.onMouseUp = this.onMouseUp.bind(this);
this.onMouseEnter = this.onMouseEnter.bind(this);
this.onMouseLeave = this.onMouseLeave.bind(this);
this.init();
}
/**
* Enables or disabled touch events
*/
set touchEnabled(enabled) {
if (this._touchEnabled === enabled) return;
this._touchEnabled = enabled;
this._touchEnabled ? this.addTouchEvents() : this.removeTouchEvents();
}
init() {
if (this.enabled) return;
this.draggableElements = document.querySelectorAll(this.options.element);
if (this.draggableElements.length === 0) {
return console.error(`${this.options.element} is not a valid element selector.`);
}
this.draggableElements.forEach((element) => element.addEventListener("mousedown", this.onMouseDown));
this.createDropzones();
if (this.dropzones.length === 0) return;
this.dropzones.forEach((dropzone) => {
dropzone.addEventListener("mouseenter", this.onMouseEnter);
dropzone.addEventListener("mouseleave", this.onMouseLeave);
});
this.registerDragActions();
this.enabled = true;
}
/**
* Deinitializes the dragging
*/
deinit() {
if (!this.enabled) return;
this.draggableElements.forEach((element) => element.removeEventListener("mousedown", this.onMouseDown));
this.dropzones.forEach((dropzone) => {
dropzone.removeEventListener("mouseenter", this.onMouseEnter);
dropzone.removeEventListener("mouseleave", this.onMouseLeave);
});
this.removeActions();
this.enabled = false;
}
/**
* mousedown event handler
*/
onMouseDown(event) {
this.draggedElement = event.currentTarget;
this.draggedElement.style.position = "absolute";
this.draggedElement.style.pointerEvents = "none";
this.setPointerOffset(event.clientX, event.clientY, this.draggedElement);
actions.execute(this.actionName, {
x: event.clientX + this.bodyScrollOffset.x - this.offset.x,
y: event.clientY + this.bodyScrollOffset.y - this.offset.y,
index: this.draggedItemIndex
});
this.options.dragStyle && this.draggedElement.classList.add(this.options.dragStyle);
this.options.onDragStart && this.options.onDragStart(this.draggedElement);
document.addEventListener("mousemove", this.onMouseMove);
document.addEventListener("mouseup", this.onMouseUp);
}
/**
* mousemove event handler
*/
onMouseMove(event) {
actions.execute(this.actionName, {
x: event.clientX + this.bodyScrollOffset.x - this.offset.x,
y: event.clientY + this.bodyScrollOffset.y - this.offset.y,
index: this.draggedItemIndex
});
}
/**
* mouseup event handler
*/
onMouseUp() {
document.removeEventListener("mousemove", this.onMouseMove);
document.removeEventListener("mouseup", this.onMouseUp);
if (this.draggedElement) {
this.draggedElement.style.position = "";
this.draggedElement.style.pointerEvents = "";
this.draggedElement.style.left = "";
this.draggedElement.style.top = "";
this.options.onDragEnd && this.options.onDragEnd(this.draggedElement);
this.options.dragStyle && this.draggedElement.classList.remove(this.options.dragStyle);
}
this.draggedOver && this.handleDrop();
this.draggedElement = null;
}
/**
* Handler for the mouseenter event
*/
onMouseEnter(event) {
if (!this.draggedElement) return;
this.draggedOver = event.currentTarget;
if (this.options.dropzoneActiveClass) {
this.draggedOver.classList.add(this.options.dropzoneActiveClass);
}
}
/**
* Handler for the mouseleave event
*/
onMouseLeave() {
if (!this.draggedElement) return;
if (this.options.dropzoneActiveClass && this.draggedOver) {
this.draggedOver.classList.remove(this.options.dropzoneActiveClass);
}
this.draggedOver = null;
}
/**
* Register dragging as an action to be able to use it externally
*/
registerDragActions() {
actions.register(this.actionName, ({ x, y, index }) => {
if (!this.draggableElements[index]) return console.error(`There is no draggable element at index ${index}`);
this.draggableElements[index].style.left = `${x}px`;
this.draggableElements[index].style.top = `${y}px`;
this.options.onDragMove && this.options.onDragMove({ x, y });
});
actions.register(this.automaticAction, this.automaticMove.bind(this));
}
/**
* Removes the registered actions
*/
removeActions() {
actions.remove(this.actionName);
actions.remove(this.automaticAction);
}
/* eslint-disable max-lines-per-function*/
/**
* Adds touch events to the draggable elements
*/
addTouchEvents() {
this.draggableElements.forEach((element) => {
this.touchEvents.push(
touchGestures.drag({
element,
onDragStart: (event) => {
this.onMouseDown({ currentTarget: event.currentTarget, clientX: event.x, clientY: event.y });
},
onDrag: ({ x, y }) => {
this.onMouseMove({ clientX: x, clientY: y });
const elementOver = document.elementFromPoint(x, y);
let dropzone = this.options.dropzones.reduce((acc, dropzone2) => {
if (acc || !elementOver) return acc;
return acc = elementOver.closest(dropzone2);
}, null);
if (!dropzone) {
dropzone = this.dropzones.includes(elementOver) ? elementOver : null;
}
if (dropzone) {
this.onMouseEnter({ currentTarget: dropzone });
return;
}
this.onMouseLeave();
},
onDragEnd: () => {
this.onMouseUp();
}
})
);
});
}
/* eslint-enable max-lines-per-function */
/**
* Removes the touch gestures
*/
removeTouchEvents() {
this.touchEvents.forEach((event) => event?.remove());
this.touchEvents = [];
}
/**
* Automatically drags an element to a dropzone
* @param {Object} options
* @param {number} options.elementIndex The index of the element you want to move
* @param {number} options.dropzoneIndex The index of the dropzone you want to move the element to
*/
automaticMove({ elementIndex, dropzoneIndex }) {
const { x, y } = this.dropzones[dropzoneIndex].getBoundingClientRect();
const { x: elementX, y: elementY } = this.draggableElements[elementIndex].getBoundingClientRect();
const direction = {
x: Math.sign(x - elementX),
y: Math.sign(y - elementY)
};
this.draggableElements[elementIndex].style.position = "absolute";
const loop = (newX, newY) => {
if (newX === x && newY === y) {
this.dropzones[dropzoneIndex].appendChild(this.draggableElements[elementIndex]);
this.draggableElements[elementIndex].style.position = "";
return;
}
newX = newX !== x ? direction.x + newX : newX;
newY = newY !== y ? direction.y + newY : newY;
this.draggableElements[elementIndex].style.left = `${newX}px`;
this.draggableElements[elementIndex].style.top = `${newY}px`;
if (newX !== x || newY !== y) requestAnimationFrame(() => loop(newX, newY));
};
loop(elementX, elementY);
}
/**
* Saves the dropzones
*/
createDropzones() {
this.dropzones = this.options.dropzones.reduce((acc, dropzone) => {
const dropzoneElements = [...document.querySelectorAll(dropzone)];
if (dropzoneElements.length === 0) {
console.error(`${dropzone} is not a valid html element to be used as a dropzone`);
}
return acc.concat(dropzoneElements);
}, []);
}
/**
* Handler when you drop the dragged item
*/
handleDrop() {
let dropType = this.options.dropType;
const eventData = {
preventDefault: () => {
dropType = "ignore";
},
target: this.draggedElement,
dropzone: this.draggedOver
};
if (this.options.onDrop) this.options.onDrop(eventData);
if (dropType === "ignore" || !this.draggedOver) return;
if (this.draggedOver.children.length === 0) dropType = "add";
switch (dropType) {
case "add":
this.draggedOver.appendChild(this.draggedElement);
break;
case "shift":
this.shiftElements();
break;
case "switch":
this.draggedElement?.parentNode.appendChild(this.draggedOver.children[0]);
this.draggedOver.appendChild(this.draggedElement);
break;
}
this.onMouseLeave();
}
/**
* Shifts the element to the nearest empty space
*/
shiftElements() {
const dropzoneIndex = this.dropzones.findIndex((dropzone) => dropzone === this.draggedOver);
const dropzoneChildren = this.dropzones.map((dropzone) => {
if (dropzone.children[0] === this.draggedElement) return [];
return [...dropzone.children];
});
const closestEmptyIndex = dropzoneChildren.reduce((acc, el, index) => {
if (el.length === 0) acc = Math.abs(dropzoneIndex - index) < Math.abs(dropzoneIndex - acc) ? index : acc;
return acc;
}, 1e5);
const directionEmpty = Math.sign(dropzoneIndex - closestEmptyIndex) > 0 ? 0 : 1;
const directionDropzone = Math.sign(dropzoneIndex - closestEmptyIndex) < 0 ? 0 : 1;
dropzoneChildren.splice(dropzoneIndex + directionDropzone, 0, [this.draggedElement]);
dropzoneChildren.splice(closestEmptyIndex + directionEmpty, 1);
dropzoneChildren.forEach((children, index) => {
children.forEach((child) => this.dropzones[index].appendChild(child));
});
}
}
IM$1.init();
return Dropzone;
}));