379 lines
9.6 KiB
JavaScript
379 lines
9.6 KiB
JavaScript
import { utilitiesInstance } from "./Utilities.js";
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import { $el } from "/scripts/ui.js";
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export class ModalOptions {
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constructor(
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bIsImageContainer = false,
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imageIndex = undefined
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) {
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this.bIsImageContainer = bIsImageContainer;
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this.imageIndex = imageIndex;
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}
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}
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export class ModalManager {
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constructor(imageDrawerInstance, modalOptions = new ModalOptions()) {
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this.imageDrawerInstance = imageDrawerInstance;
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// If this modal is representing an image in imageList,
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// add functionality to switch to neighboring images or
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// enable auto mode / slideshows, among other things
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this._modalOptions = modalOptions;
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// Zoom and Pan functionality
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this._scale = 1;
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this._translateX = -50; // Initial translate X percentage
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this._translateY = -50; // Initial translate Y percentage
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this._bIsPanningActive = false;
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this._bHasPanned = false;
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this._startX = 0;
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this._startY = 0;
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this._modalContainer;
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this._modalContent;
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this.handleKeyDownFunction;
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this._bButtonPressed = false;
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}
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createModal(modalContent) {
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if (!modalContent) { return; }
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this._modalContent = modalContent;
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this._setModalContentStyle();
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// Append modal content to modal container
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this._getOrCreateModalContainer().appendChild(this._modalContent);
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this._createModalControlButtons();
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this.handleKeyDownFunction = (event) => { this._handleKeyDown(event); };
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// Add key event listeners
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document.addEventListener("keydown", this.handleKeyDownFunction);
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return this._getOrCreateModalContainer();
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}
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createModalReadyImage(href) {
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return $el("img", {
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src: href,
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style: {
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position: 'relative',
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width: '99vw',
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height: '99vh',
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objectFit: 'contain',
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display: 'block',
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margin: 'auto',
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},
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});
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}
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_setModalContentStyle() {
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this._modalContent.style.position = 'absolute';
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this._modalContent.style.left = "50%";
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this._modalContent.style.top = "50%";
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this._modalContent.style.transform = "translate(-50%, -50%)";
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this._modalContent.style.maxWidth = "99%";
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this._modalContent.style.maxHeight = "99%";
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this._modalContent.style.overflow = "hidden";
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// Prevent drag & drop operation
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this._modalContent.draggable = false;
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}
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_createAndOpenModalContainer() {
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this._modalContainer = $el("div",
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{
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style: {
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display: "block",
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position: "fixed",
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zIndex: "10000",
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left: "0%",
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top: "0%",
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width: "100%",
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height: "100%",
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maxWidth: "100%",
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maxHeight: "100%",
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overflow: "auto",
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backgroundColor: "rgba(0,0,0,0.7)",
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}
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}
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);
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this._modalContainer.addEventListener("wheel", (event) => {
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if (this._modalOptions.bIsImageContainer) {
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event.preventDefault();
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this._zoom(event);
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}
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});
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this._modalContainer.addEventListener("mousedown", (event) => {
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if (this._modalOptions.bIsImageContainer) {
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event.preventDefault();
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this._startPan(event);
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}
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});
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this._modalContainer.addEventListener("mousemove", (event) => {
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if (this._modalOptions.bIsImageContainer) {
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event.preventDefault();
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this._pan(event);
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}
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});
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this._modalContainer.addEventListener("mouseup", (event) => {
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if (this._modalOptions.bIsImageContainer) {
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event.preventDefault();
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}
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this._onMouseUp(event);
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});
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this._modalContainer.addEventListener("mouseleave", (event) => {
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if (this._modalOptions.bIsImageContainer) {
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event.preventDefault();
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this._endPan();
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}
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});
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// Prevent drag & drop operation
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this._modalContainer.addEventListener("dragstart", (event) => {
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if (this._modalOptions.bIsImageContainer) {
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event.preventDefault();
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}
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});
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this._modalContainer.draggable = false;
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this._modalContainer.data = this;
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// Append modal container to the document body
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document.body.appendChild(this._modalContainer);
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}
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_getOrCreateModalContainer() {
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if (!this._modalContainer) {
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this._createAndOpenModalContainer();
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}
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return this._modalContainer;
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}
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_createModalControlButtons() {
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const createButton = (text, tooltip, clickFunction) => {
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const button = $el("button", {
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title: tooltip,
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textContent: text,
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style: {
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background: "none",
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border: "none",
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padding: "0px",
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color: "white",
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fontWeight: "bolder",
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fontSize: "400%",
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cursor: 'pointer',
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position: "absolute",
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filter: "drop-shadow(13px 0px black)",
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},
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onmousedown: () => {
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this._bButtonPressed = true;
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},
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onclick: clickFunction,
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});
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button.classList.add("JNodes-interactive-container");
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return button;
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}
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// Count
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if (this._modalOptions.imageIndex != undefined) {
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const previousImageButton = createButton("<", "See previous image", () => { this._displayNeighbouringImage(-1); });
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previousImageButton.style.left = "2.5%";
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previousImageButton.style.top = "50%";
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this._getOrCreateModalContainer().appendChild(previousImageButton);
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const nextImageButton = createButton(">", "See next image", () => { this._displayNeighbouringImage(1); });
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nextImageButton.style.right = "2.5%";
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nextImageButton.style.top = "50%";
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this._getOrCreateModalContainer().appendChild(nextImageButton);
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const imageDrawerListInstance = this.imageDrawerInstance.getComponentByName("ImageDrawerList");
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const currentListChildren = imageDrawerListInstance.getVisibleImageListChildren();
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const countWidget = $el("label", {
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textContent: `${this._modalOptions.imageIndex + 1}/${currentListChildren.length}`,
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style: {
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background: "rgba(0,0,0,0.5)",
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color: "white",
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fontWeight: "bolder",
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fontSize: "100%",
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fontFamily: "arial",
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position: "absolute",
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right: "1%",
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top: "1%"
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}
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});
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this._getOrCreateModalContainer().appendChild(countWidget);
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}
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}
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// Function to close the modal and destroy the class instance
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closeModal() {
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if (this._modalContainer && this._modalContainer.parentNode) {
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this._modalContainer.parentNode.removeChild(this._modalContainer);
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}
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document.removeEventListener("keydown", this.handleKeyDownFunction);
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delete this;
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}
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_handleKeyDown(event) {
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if (event.key === "Escape") {
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event.preventDefault();
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this.closeModal();
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} else if (event.key === "ArrowLeft") {
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if (this._modalOptions.bIsImageContainer){
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event.preventDefault();
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this._displayNeighbouringImage(-1);
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}
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} else if (event.key === "ArrowRight") {
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if (this._modalOptions.bIsImageContainer){
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event.preventDefault();
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this._displayNeighbouringImage(1);
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}
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}
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}
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_zoom(event) {
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if (!this._modalOptions.bIsImageContainer) { return; }
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event.preventDefault(); // Prevent the default scroll behavior
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const zoomSpeed = 0.1;
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const delta = event.deltaY;
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// Adjust the scale based on scroll direction
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if (delta > 0) {
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this._scale = Math.max(0.1, this._scale - zoomSpeed); // Zoom out
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} else {
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this._scale = Math.min(5, this._scale + zoomSpeed); // Zoom in
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}
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// Apply the scale and initial translate to the modal content
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this._modalContent.style.transform = `translate(${this._translateX}%, ${this._translateY}%) scale(${this._scale})`;
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}
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_startPan(event) {
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if (!this._modalOptions.bIsImageContainer) { return; }
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this._bIsPanningActive = true;
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this._getOrCreateModalContainer().style.cursor = "grabbing";
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this._startX = event.clientX;
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this._startY = event.clientY;
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}
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_pan(event) {
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if (!this._modalOptions.bIsImageContainer) { return; }
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if (!this._bIsPanningActive) return;
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const dx = event.clientX - this._startX;
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const dy = event.clientY - this._startY;
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// Adjust translate values
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this._translateX += (dx / this._getOrCreateModalContainer().clientWidth) * 100;
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this._translateY += (dy / this._getOrCreateModalContainer().clientHeight) * 100;
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// Update start positions for next movement
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this._startX = event.clientX;
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this._startY = event.clientY;
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// Apply the transformation
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this._modalContent.style.transform = `translate(${this._translateX}%, ${this._translateY}%) scale(${this._scale})`;
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this._bHasPanned = true;
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}
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_endPan() {
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if (!this._modalOptions.bIsImageContainer) { return; }
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this._bIsPanningActive = false;
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this._getOrCreateModalContainer().style.cursor = "grab";
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}
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_onMouseUp(event) {
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this._endPan();
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if (this._bButtonPressed == true) {
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this._bButtonPressed = false;
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return;
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}
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if (this._bHasPanned) {
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this._bHasPanned = false;
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} else if (event.button == 0) { // Left mouse button only can close
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if (!this._modalOptions.bIsImageContainer &&
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(event.target == this._modalContent ||
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utilitiesInstance.hasAncestor(event.target, this._modalContent))
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) {
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return;
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}
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this.closeModal();
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}
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}
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_displayNeighbouringImage(offset = 0) {
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if (this._modalOptions.imageIndex !== undefined) {
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const imageDrawerListInstance = this.imageDrawerInstance.getComponentByName("ImageDrawerList");
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const currentListChildren = imageDrawerListInstance.getVisibleImageListChildren();
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let newImageIndex = this._modalOptions.imageIndex;
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let newImage;
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// Loop until we find an image format child
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do {
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newImageIndex += offset;
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// Wrap index to first or last index at the extremes
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newImageIndex = ((newImageIndex % currentListChildren.length) + currentListChildren.length) % currentListChildren.length;
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newImage = currentListChildren[newImageIndex];
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// Break if we round back to the original image index
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if (newImageIndex == this._modalOptions.imageIndex) {
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break;
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}
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} while (newImage?.bIsVideoFormat);
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const modalManager = new ModalManager(
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this.imageDrawerInstance,
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new ModalOptions(
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this._modalOptions.bIsImageContainer,
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newImageIndex
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)
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);
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modalManager.createModal(modalManager.createModalReadyImage(newImage.fileInfo.imageHref));
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this.closeModal();
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}
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}
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} |