src/extras/ContextMenu/ContextMenu.js
import {Map} from "../../viewer/scene/utils/Map.js";
const idMap = new Map();
/**
* Internal data class that represents the state of a menu or a submenu.
* @private
*/
class Menu {
constructor(id) {
this.id = id;
this.parentItem = null; // Set to an Item when this Menu is a submenu
this.groups = [];
this.menuElement = null;
this.shown = false;
this.mouseOver = 0;
}
}
/**
* Internal data class that represents a group of Items in a Menu.
* @private
*/
class Group {
constructor() {
this.items = [];
}
}
/**
* Internal data class that represents the state of a menu item.
* @private
*/
class Item {
constructor(id, getTitle, doAction, getEnabled, getShown) {
this.id = id;
this.getTitle = getTitle;
this.doAction = doAction;
this.getEnabled = getEnabled;
this.getShown = getShown;
this.itemElement = null;
this.subMenu = null;
this.enabled = true;
}
}
/**
* @desc A customizable HTML context menu.
*
* [<img src="http://xeokit.io/img/docs/ContextMenu/ContextMenu.gif">](https://xeokit.github.io/xeokit-sdk/examples/#ContextMenu_Canvas_TreeViewPlugin_Custom)
*
* * [[Run this example](https://xeokit.github.io/xeokit-sdk/examples/#ContextMenu_Canvas_TreeViewPlugin_Custom)]
*
* ## Overview
*
* * A pure JavaScript, lightweight context menu
* * Dynamically configure menu items
* * Dynamically enable or disable items
* * Dynamically show or hide items
* * Supports cascading sub-menus
* * Configure custom style with CSS (see examples above)
*
* ## Usage
*
* In the example below we'll create a ````ContextMenu```` that pops up whenever we right-click on an {@link Entity} within
* our {@link Scene}.
*
* First, we'll create the ````ContextMenu````, configuring it with a list of menu items.
*
* Each item has:
*
* * a ````title```` for the item,
* * a ````doAction()```` callback to fire when the item's title is clicked,
* * an optional ````getShown()```` callback that indicates if the item should shown in the menu or not, and
* * an optional ````getEnabled()```` callback that indicates if the item should be shown enabled in the menu or not.
*
* <br>
*
* The ````getShown()```` and ````getEnabled()```` callbacks are invoked whenever the menu is shown.
*
* When an item's ````getShown()```` callback
* returns ````true````, then the item is shown. When it returns ````false````, then the item is hidden. An item without
* a ````getShown()```` callback is always shown.
*
* When an item's ````getEnabled()```` callback returns ````true````, then the item is enabled and clickable (as long as it's also shown). When it
* returns ````false````, then the item is disabled and cannot be clicked. An item without a ````getEnabled()````
* callback is always enabled and clickable.
*
* Note how the ````doAction()````, ````getShown()```` and ````getEnabled()```` callbacks accept a ````context````
* object. That must be set on the ````ContextMenu```` before we're able to we show it. The context object can be anything. In this example,
* we'll use the context object to provide the callbacks with the Entity that we right-clicked.
*
* We'll also initially enable the ````ContextMenu````.
*
* [[Run this example](https://xeokit.github.io/xeokit-sdk/examples/#ContextMenu_Canvas_Custom)]
*
* ````javascript
* const canvasContextMenu = new ContextMenu({
*
* enabled: true,
*
* items: [
* [
* {
* title: "Hide Object",
* getEnabled: (context) => {
* return context.entity.visible; // Can't hide entity if already hidden
* },
* doAction: function (context) {
* context.entity.visible = false;
* }
* }
* ],
* [
* {
* title: "Select Object",
* getEnabled: (context) => {
* return (!context.entity.selected); // Can't select an entity that's already selected
* },
* doAction: function (context) {
* context.entity.selected = true;
* }
* }
* ],
* [
* {
* title: "X-Ray Object",
* getEnabled: (context) => {
* return (!context.entity.xrayed); // Can't X-ray an entity that's already X-rayed
* },
* doAction: (context) => {
* context.entity.xrayed = true;
* }
* }
* ]
* ]
* });
* ````
*
* Next, we'll make the ````ContextMenu```` appear whenever we right-click on an Entity. Whenever we right-click
* on the canvas, we'll attempt to pick the Entity at those mouse coordinates. If we succeed, we'll feed the
* Entity into ````ContextMenu```` via the context object, then show the ````ContextMenu````.
*
* From there, each ````ContextMenu```` item's ````getEnabled()```` callback will be invoked (if provided), to determine if the item should
* be enabled. If we click an item, its ````doAction()```` callback will be invoked with our context object.
*
* Remember that we must set the context on our ````ContextMenu```` before we show it, otherwise it will log an error to the console,
* and ignore our attempt to show it.
*
* ````javascript*
* viewer.scene.canvas.canvas.oncontextmenu = (e) => { // Right-clicked on the canvas
*
* if (!objectContextMenu.enabled) {
* return;
* }
*
* var hit = viewer.scene.pick({ // Try to pick an Entity at the coordinates
* canvasPos: [e.pageX, e.pageY]
* });
*
* if (hit) { // Picked an Entity
*
* objectContextMenu.context = { // Feed entity to ContextMenu
* entity: hit.entity
* };
*
* objectContextMenu.show(e.pageX, e.pageY); // Show the ContextMenu
* }
*
* e.preventDefault();
* });
* ````
*
* Note how we only show the ````ContextMenu```` if it's enabled. We can use that mechanism to switch between multiple
* ````ContextMenu```` instances depending on what we clicked.
*
* ## Dynamic Item Titles
*
* To make an item dynamically regenerate its title text whenever we show the ````ContextMenu````, provide its title with a
* ````getTitle()```` callback. The callback will fire each time you show ````ContextMenu````, which will dynamically
* set the item title text.
*
* In the example below, we'll create a simple ````ContextMenu```` that allows us to toggle the selection of an object
* via its first item, which changes text depending on whether we are selecting or deselecting the object.
*
* [[Run an example](https://xeokit.github.io/xeokit-sdk/examples/#ContextMenu_dynamicItemTitles)]
*
* ````javascript
* const canvasContextMenu = new ContextMenu({
*
* enabled: true,
*
* items: [
* [
* {
* getTitle: (context) => {
* return (!context.entity.selected) ? "Select" : "Undo Select";
* },
* doAction: function (context) {
* context.entity.selected = !context.entity.selected;
* }
* },
* {
* title: "Clear Selection",
* getEnabled: function (context) {
* return (context.viewer.scene.numSelectedObjects > 0);
* },
* doAction: function (context) {
* context.viewer.scene.setObjectsSelected(context.viewer.scene.selectedObjectIds, false);
* }
* }
* ]
* ]
* });
* ````
*
* ## Sub-menus
*
* Each menu item can optionally have a sub-menu, which will appear when we hover over the item.
*
* In the example below, we'll create a much simpler ````ContextMenu```` that has only one item, called "Effects", which
* will open a cascading sub-menu whenever we hover over that item.
*
* Note that our "Effects" item has no ````doAction```` callback, because an item with a sub-menu performs no
* action of its own.
*
* [[Run this example](https://xeokit.github.io/xeokit-sdk/examples/#ContextMenu_subMenus)]
*
* ````javascript
* const canvasContextMenu = new ContextMenu({
* items: [ // Top level items
* [
* {
* getTitle: (context) => {
* return "Effects";
* },
*
* items: [ // Sub-menu
* [
* {
* getTitle: (context) => {
* return (!context.entity.visible) ? "Show" : "Hide";
* },
* doAction: function (context) {
* context.entity.visible = !context.entity.visible;
* }
* },
* {
* getTitle: (context) => {
* return (!context.entity.selected) ? "Select" : "Undo Select";
* },
* doAction: function (context) {
* context.entity.selected = !context.entity.selected;
* }
* },
* {
* getTitle: (context) => {
* return (!context.entity.highlighted) ? "Highlight" : "Undo Highlight";
* },
* doAction: function (context) {
* context.entity.highlighted = !context.entity.highlighted;
* }
* }
* ]
* ]
* }
* ]
* ]
* });
* ````
*/
class ContextMenu {
/**
* Creates a ````ContextMenu````.
*
* The ````ContextMenu```` will be initially hidden.
*
* @param {Object} [cfg] ````ContextMenu```` configuration.
* @param {Object} [cfg.items] The context menu items. These can also be dynamically set on {@link ContextMenu#items}. See the class documentation for an example.
* @param {Object} [cfg.context] The context, which is passed into the item callbacks. This can also be dynamically set on {@link ContextMenu#context}. This must be set before calling {@link ContextMenu#show}.
* @param {Boolean} [cfg.enabled=true] Whether this ````ContextMenu```` is initially enabled. {@link ContextMenu#show} does nothing while this is ````false````.
* @param {Boolean} [cfg.hideOnMouseDown=true] Whether this ````ContextMenu```` automatically hides whenever we mouse-down or tap anywhere in the page.
* @param {Boolean} [cfg.hideOnAction=true] Whether this ````ContextMenu```` automatically hides after we select a menu item. Se false if we want the menu to remain shown and show any updates to its item titles, after we've selected an item.
*/
constructor(cfg = {}) {
this._id = idMap.addItem();
this._context = null;
this._enabled = false; // True when the ContextMenu is enabled
this._itemsCfg = []; // Items as given as configs
this._rootMenu = null; // The root Menu in the tree
this._menuList = []; // List of Menus
this._menuMap = {}; // Menus mapped to their IDs
this._itemList = []; // List of Items
this._itemMap = {}; // Items mapped to their IDs
this._shown = false; // True when the ContextMenu is visible
this._nextId = 0;
/**
* Subscriptions to events fired at this ContextMenu.
* @private
*/
this._eventSubs = {};
if (cfg.hideOnMouseDown !== false) {
document.addEventListener("mousedown", (event) => {
if (!event.target.classList.contains("xeokit-context-menu-item")) {
this.hide();
}
});
document.addEventListener("touchstart", this._canvasTouchStartHandler = (event) => {
if (!event.target.classList.contains("xeokit-context-menu-item")) {
this.hide();
}
});
}
if (cfg.items) {
this.items = cfg.items;
}
this._hideOnAction = (cfg.hideOnAction !== false);
this.context = cfg.context;
this.enabled = cfg.enabled !== false;
this.hide();
}
/**
Subscribes to an event fired at this ````ContextMenu````.
@param {String} event The event
@param {Function} callback Callback fired on the event
*/
on(event, callback) {
let subs = this._eventSubs[event];
if (!subs) {
subs = [];
this._eventSubs[event] = subs;
}
subs.push(callback);
}
/**
Fires an event at this ````ContextMenu````.
@param {String} event The event type name
@param {Object} value The event parameters
*/
fire(event, value) {
const subs = this._eventSubs[event];
if (subs) {
for (let i = 0, len = subs.length; i < len; i++) {
subs[i](value);
}
}
}
/**
* Sets the ````ContextMenu```` items.
*
* These can be updated dynamically at any time.
*
* See class documentation for an example.
*
* @type {Object[]}
*/
set items(itemsCfg) {
this._clear();
this._itemsCfg = itemsCfg || [];
this._parseItems(itemsCfg);
this._createUI();
}
/**
* Gets the ````ContextMenu```` items.
*
* @type {Object[]}
*/
get items() {
return this._itemsCfg;
}
/**
* Sets whether this ````ContextMenu```` is enabled.
*
* Hides the menu when disabling.
*
* @type {Boolean}
*/
set enabled(enabled) {
enabled = (!!enabled);
if (enabled === this._enabled) {
return;
}
this._enabled = enabled;
if (!this._enabled) {
this.hide();
}
}
/**
* Gets whether this ````ContextMenu```` is enabled.
*
* {@link ContextMenu#show} does nothing while this is ````false````.
*
* @type {Boolean}
*/
get enabled() {
return this._enabled;
}
/**
* Sets the ````ContextMenu```` context.
*
* The context can be any object that you need to be provides to the callbacks configured on {@link ContextMenu#items}.
*
* This must be set before calling {@link ContextMenu#show}.
*
* @type {Object}
*/
set context(context) {
this._context = context;
}
/**
* Gets the ````ContextMenu```` context.
*
* @type {Object}
*/
get context() {
return this._context;
}
/**
* Shows this ````ContextMenu```` at the given page coordinates.
*
* Does nothing when {@link ContextMenu#enabled} is ````false````.
*
* Logs error to console and does nothing if {@link ContextMenu#context} has not been set.
*
* Fires a "shown" event when shown.
*
* @param {Number} pageX Page X-coordinate.
* @param {Number} pageY Page Y-coordinate.
*/
show(pageX, pageY) {
if (!this._context) {
console.error("ContextMenu cannot be shown without a context - set context first");
return;
}
if (!this._enabled) {
return;
}
if (this._shown) {
return;
}
this._hideAllMenus();
this._updateItemsTitles();
this._updateItemsEnabledStatus();
this._showMenu(this._rootMenu.id, pageX, pageY);
this._shown = true;
this.fire("shown", {});
}
/**
* Gets whether this ````ContextMenu```` is currently shown or not.
*
* @returns {Boolean} Whether this ````ContextMenu```` is shown.
*/
get shown() {
return this._shown;
}
/**
* Hides this ````ContextMenu````.
*
* Fires a "hidden" event when hidden.
*/
hide() {
if (!this._enabled) {
return;
}
if (!this._shown) {
return;
}
this._hideAllMenus();
this._shown = false;
this.fire("hidden", {});
}
/**
* Destroys this ````ContextMenu````.
*/
destroy() {
this._context = null;
this._clear();
if (this._id !== null) {
idMap.removeItem(this._id);
this._id = null;
}
}
_clear() { // Destroys DOM elements, clears menu data
for (let i = 0, len = this._menuList.length; i < len; i++) {
const menu = this._menuList[i];
const menuElement = menu.menuElement;
menuElement.parentElement.removeChild(menuElement);
}
this._itemsCfg = [];
this._rootMenu = null;
this._menuList = [];
this._menuMap = {};
this._itemList = [];
this._itemMap = {};
}
_parseItems(itemsCfg) { // Parses "items" config into menu data
const visitItems = (itemsCfg) => {
const menuId = this._getNextId();
const menu = new Menu(menuId);
for (let i = 0, len = itemsCfg.length; i < len; i++) {
const itemsGroupCfg = itemsCfg[i];
const group = new Group();
menu.groups.push(group);
for (let j = 0, lenj = itemsGroupCfg.length; j < lenj; j++) {
const itemCfg = itemsGroupCfg[j];
const subItemsCfg = itemCfg.items;
const hasSubItems = (subItemsCfg && (subItemsCfg.length > 0));
const itemId = this._getNextId();
const getTitle = itemCfg.getTitle || (() => {
return (itemCfg.title || "");
});
const doAction = itemCfg.doAction || itemCfg.callback || (() => {
});
const getEnabled = itemCfg.getEnabled || (() => {
return true;
});
const getShown = itemCfg.getShown || (() => {
return true;
});
const item = new Item(itemId, getTitle, doAction, getEnabled, getShown);
item.parentMenu = menu;
group.items.push(item);
if (hasSubItems) {
const subMenu = visitItems(subItemsCfg);
item.subMenu = subMenu;
subMenu.parentItem = item;
}
this._itemList.push(item);
this._itemMap[item.id] = item;
}
}
this._menuList.push(menu);
this._menuMap[menu.id] = menu;
return menu;
};
this._rootMenu = visitItems(itemsCfg);
}
_getNextId() { // Returns a unique ID
return "ContextMenu_" + this._id + "_" + this._nextId++; // Start ID with alpha chars to make a valid DOM element selector
}
_createUI() { // Builds DOM elements for the entire menu tree
const visitMenu = (menu) => {
this._createMenuUI(menu);
const groups = menu.groups;
for (let i = 0, len = groups.length; i < len; i++) {
const group = groups[i];
const groupItems = group.items;
for (let j = 0, lenj = groupItems.length; j < lenj; j++) {
const item = groupItems[j];
const subMenu = item.subMenu;
if (subMenu) {
visitMenu(subMenu);
}
}
}
};
visitMenu(this._rootMenu);
}
_createMenuUI(menu) { // Builds DOM elements for a menu
const groups = menu.groups;
const html = [];
html.push('<div class="xeokit-context-menu ' + menu.id + '" style="z-index:300000; position: absolute;">');
html.push('<ul>');
if (groups) {
for (let i = 0, len = groups.length; i < len; i++) {
const group = groups[i];
const groupIdx = i;
const groupLen = len;
const groupItems = group.items;
if (groupItems) {
for (let j = 0, lenj = groupItems.length; j < lenj; j++) {
const item = groupItems[j];
const itemSubMenu = item.subMenu;
const actionTitle = item.title || "";
if (itemSubMenu) {
html.push(
'<li id="' + item.id + '" class="xeokit-context-menu-item" style="' +
((groupIdx === groupLen - 1) || ((j < lenj - 1)) ? 'border-bottom: 0' : 'border-bottom: 1px solid black') +
'">' +
actionTitle +
' [MORE]' +
'</li>');
} else {
html.push(
'<li id="' + item.id + '" class="xeokit-context-menu-item" style="' +
((groupIdx === groupLen - 1) || ((j < lenj - 1)) ? 'border-bottom: 0' : 'border-bottom: 1px solid black') +
'">' +
actionTitle +
'</li>');
}
}
}
}
}
html.push('</ul>');
html.push('</div>');
const htmlString = html.join("");
document.body.insertAdjacentHTML('beforeend', htmlString);
const menuElement = document.querySelector("." + menu.id);
menu.menuElement = menuElement;
menuElement.style["border-radius"] = 4 + "px";
menuElement.style.display = 'none';
menuElement.style["z-index"] = 300000;
menuElement.style.background = "white";
menuElement.style.border = "1px solid black";
menuElement.style["box-shadow"] = "0 4px 5px 0 gray";
menuElement.oncontextmenu = (e) => {
e.preventDefault();
};
// Bind event handlers
const self = this;
let lastSubMenu = null;
if (groups) {
for (let i = 0, len = groups.length; i < len; i++) {
const group = groups[i];
const groupItems = group.items;
if (groupItems) {
for (let j = 0, lenj = groupItems.length; j < lenj; j++) {
const item = groupItems[j];
const itemSubMenu = item.subMenu;
item.itemElement = document.getElementById(item.id);
if (!item.itemElement) {
console.error("ContextMenu item element not found: " + item.id);
continue;
}
item.itemElement.addEventListener("mouseenter", (event) => {
event.preventDefault();
const subMenu = item.subMenu;
if (!subMenu) {
if (lastSubMenu) {
self._hideMenu(lastSubMenu.id);
lastSubMenu = null;
}
return;
}
if (lastSubMenu && (lastSubMenu.id !== subMenu.id)) {
self._hideMenu(lastSubMenu.id);
lastSubMenu = null;
}
if (item.enabled === false) {
return;
}
const itemElement = item.itemElement;
const subMenuElement = subMenu.menuElement;
const itemRect = itemElement.getBoundingClientRect();
const menuRect = subMenuElement.getBoundingClientRect();
const subMenuWidth = 200; // TODO
const showOnLeft = ((itemRect.right + subMenuWidth) > window.innerWidth);
if (showOnLeft) {
self._showMenu(subMenu.id, itemRect.left - subMenuWidth, itemRect.top - 1);
} else {
self._showMenu(subMenu.id, itemRect.right - 5, itemRect.top - 1);
}
lastSubMenu = subMenu;
});
if (!itemSubMenu) {
// Item without sub-menu
// clicking item fires the item's action callback
item.itemElement.addEventListener("click", (event) => {
event.preventDefault();
if (!self._context) {
return;
}
if (item.enabled === false) {
return;
}
if (item.doAction) {
item.doAction(self._context);
}
if (this._hideOnAction) {
self.hide();
} else {
self._updateItemsTitles();
self._updateItemsEnabledStatus();
}
});
item.itemElement.addEventListener("mouseenter", (event) => {
event.preventDefault();
if (item.enabled === false) {
return;
}
if (item.doHover) {
item.doHover(self._context);
}
});
}
}
}
}
}
}
_updateItemsTitles() { // Dynamically updates the title of each Item to the result of Item#getTitle()
if (!this._context) {
return;
}
for (let i = 0, len = this._itemList.length; i < len; i++) {
const item = this._itemList[i];
const itemElement = item.itemElement;
if (!itemElement) {
continue;
}
const getShown = item.getShown;
if (!getShown || !getShown(this._context)) {
continue;
}
const title = item.getTitle(this._context);
if (item.subMenu) {
itemElement.innerText = title;
} else {
itemElement.innerText = title;
}
}
}
_updateItemsEnabledStatus() { // Enables or disables each Item, depending on the result of Item#getEnabled()
if (!this._context) {
return;
}
for (let i = 0, len = this._itemList.length; i < len; i++) {
const item = this._itemList[i];
const itemElement = item.itemElement;
if (!itemElement) {
continue;
}
const getEnabled = item.getEnabled;
if (!getEnabled) {
continue;
}
const getShown = item.getShown;
if (!getShown) {
continue;
}
const shown = getShown(this._context);
item.shown = shown;
if (!shown) {
itemElement.style.visibility = "hidden";
itemElement.style.height = "0";
itemElement.style.padding = "0";
continue;
} else {
itemElement.style.visibility = "visible";
itemElement.style.height = "auto";
itemElement.style.padding = null;
}
const enabled = getEnabled(this._context);
item.enabled = enabled;
if (!enabled) {
itemElement.classList.add("disabled");
} else {
itemElement.classList.remove("disabled");
}
}
}
_showMenu(menuId, pageX, pageY) { // Shows the given menu, at the specified page coordinates
const menu = this._menuMap[menuId];
if (!menu) {
console.error("Menu not found: " + menuId);
return;
}
if (menu.shown) {
return;
}
const menuElement = menu.menuElement;
if (menuElement) {
this._showMenuElement(menuElement, pageX, pageY);
menu.shown = true;
}
}
_hideMenu(menuId) { // Hides the given menu
const menu = this._menuMap[menuId];
if (!menu) {
console.error("Menu not found: " + menuId);
return;
}
if (!menu.shown) {
return;
}
const menuElement = menu.menuElement;
if (menuElement) {
this._hideMenuElement(menuElement);
menu.shown = false;
}
}
_hideAllMenus() {
for (let i = 0, len = this._menuList.length; i < len; i++) {
const menu = this._menuList[i];
this._hideMenu(menu.id);
}
}
_showMenuElement(menuElement, pageX, pageY) { // Shows the given menu element, at the specified page coordinates
menuElement.style.display = 'block';
const menuHeight = menuElement.offsetHeight;
const menuWidth = menuElement.offsetWidth;
if ((pageY + menuHeight) > window.innerHeight) {
pageY = window.innerHeight - menuHeight;
}
if ((pageX + menuWidth) > window.innerWidth) {
pageX = window.innerWidth - menuWidth;
}
menuElement.style.left = pageX + 'px';
menuElement.style.top = pageY + 'px';
}
_hideMenuElement(menuElement) {
menuElement.style.display = 'none';
}
}
export {ContextMenu};
