Mon 21 Jul 22:43:21 CEST 2025
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js/term/widgets/node.js
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308
js/term/widgets/node.js
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/**
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** ==============================
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** O O O OOOO
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** O O O O O O
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** O O O O O O
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** OOOO OOOO O OOO OOOO
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** O O O O O O O
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** O O O O O O O
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** OOOO OOOO O O OOOO
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** ==============================
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** Dr. Stefan Bosse http://www.bsslab.de
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**
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** COPYRIGHT: THIS SOFTWARE, EXECUTABLE AND SOURCE CODE IS OWNED
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** BY THE AUTHOR(S).
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** THIS SOURCE CODE MAY NOT BE COPIED, EXTRACTED,
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** MODIFIED, OR OTHERWISE USED IN A CONTEXT
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** OUTSIDE OF THE SOFTWARE SYSTEM.
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**
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** $AUTHORS: Christopher Jeffrey and contributors, Stefan Bosse
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** $INITIAL: (C) 2013-2015, Christopher Jeffrey and contributors
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** $MODIFIED: sbosse (2017-2021).
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** $VERSION: 1.2.1
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**
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** $INFO:
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*
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* node.js - base abstract node for blessed
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*
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** $ENDOFINFO
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*/
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/**
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* Modules
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*/
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var Comp = Require('com/compat');
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var EventEmitter = Require('term/events').EventEmitter;
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/**
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* Node
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*/
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function Node(options) {
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var self = this;
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var Screen = Require('term/widgets/screen');
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if (!instanceOf(this,Node)) {
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return new Node(options);
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}
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EventEmitter.call(this);
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options = options || {};
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this.options = options;
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this.screen = this.screen || options.screen;
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if (!this.screen) {
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if (this.type === 'screen') {
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this.screen = this;
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} else if (Screen.total === 1) {
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this.screen = Screen.global;
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} else if (options.parent) {
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this.screen = options.parent;
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while (this.screen && this.screen.type !== 'screen') {
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this.screen = this.screen.parent;
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}
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} else if (Screen.total) {
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// This _should_ work in most cases as long as the element is appended
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// synchronously after the screen's creation. Throw error if not.
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this.screen = Screen.instances[Screen.instances.length - 1];
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process.nextTick(function() {
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if (!self.parent) {
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throw new Error('Element (' + self.type + ')'
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+ ' was not appended synchronously after the'
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+ ' screen\'s creation. Please set a `parent`'
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+ ' or `screen` option in the element\'s constructor'
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+ ' if you are going to use multiple screens and'
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+ ' append the element later.');
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}
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});
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} else {
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throw new Error('No active screen.');
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}
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}
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this.parent = options.parent || null;
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this.children = [];
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this.$ = this._ = this.data = {};
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this.uid = Node.uid++;
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this.index = this.index != null ? this.index : -1;
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if (this.type !== 'screen') {
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this.detached = true;
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}
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if (this.parent) {
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this.parent.append(this);
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}
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(options.children || []).forEach(this.append.bind(this));
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}
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Node.uid = 0;
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//Node.prototype.__proto__ = EventEmitter.prototype;
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inheritPrototype(Node,EventEmitter);
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Node.prototype.type = 'node';
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Node.prototype.insert = function(element, i) {
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var self = this;
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if (element.screen && element.screen !== this.screen) {
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throw new Error('Cannot switch a node\'s screen.');
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}
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element.detach();
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element.parent = this;
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element.screen = this.screen;
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if (i === 0) {
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this.children.unshift(element);
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} else if (i === this.children.length) {
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this.children.push(element);
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} else {
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this.children.splice(i, 0, element);
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}
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element.emit('reparent', this);
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this.emit('adopt', element);
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(function emit(el) {
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var n = el.detached !== self.detached;
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el.detached = self.detached;
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if (n) el.emit('attach');
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el.children.forEach(emit);
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})(element);
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if (!this.screen.focused) {
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this.screen.focused = element;
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}
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};
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Node.prototype.prepend = function(element) {
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this.insert(element, 0);
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};
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Node.prototype.append = function(element) {
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this.insert(element, this.children.length);
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};
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Node.prototype.insertBefore = function(element, other) {
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var i = this.children.indexOf(other);
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if (~i) this.insert(element, i);
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};
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Node.prototype.insertAfter = function(element, other) {
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var i = this.children.indexOf(other);
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if (~i) this.insert(element, i + 1);
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};
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Node.prototype.remove = function(element) {
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if (element.parent !== this) return;
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var i = this.children.indexOf(element);
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if (!~i) return;
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element.clearPos();
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element.parent = null;
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this.children.splice(i, 1);
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i = this.screen.clickable.indexOf(element);
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if (~i) this.screen.clickable.splice(i, 1);
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i = this.screen.keyable.indexOf(element);
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if (~i) this.screen.keyable.splice(i, 1);
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element.emit('reparent', null);
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this.emit('remove', element);
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(function emit(el) {
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var n = el.detached !== true;
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el.detached = true;
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if (n) el.emit('detach');
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el.children.forEach(emit);
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})(element);
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if (this.screen.focused === element) {
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this.screen.rewindFocus();
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}
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};
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Node.prototype.detach = function() {
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if (this.parent) this.parent.remove(this);
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};
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Node.prototype.free = function() {
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return;
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};
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Node.prototype.destroy = function() {
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this.detach();
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this.forDescendants(function(el) {
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el.free();
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el.destroyed = true;
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el.emit('destroy');
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}, this);
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};
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Node.prototype.forDescendants = function(iter, s) {
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if (s) iter(this);
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this.children.forEach(function emit(el) {
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iter(el);
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el.children.forEach(emit);
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});
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};
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Node.prototype.forAncestors = function(iter, s) {
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var el = this;
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if (s) iter(this);
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while (el = el.parent) {
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iter(el);
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}
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};
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Node.prototype.collectDescendants = function(s) {
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var out = [];
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this.forDescendants(function(el) {
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out.push(el);
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}, s);
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return out;
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};
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Node.prototype.collectAncestors = function(s) {
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var out = [];
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this.forAncestors(function(el) {
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out.push(el);
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}, s);
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return out;
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};
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Node.prototype.emitDescendants = function() {
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var args = Array.prototype.slice(arguments)
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, iter;
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if (typeof args[args.length - 1] === 'function') {
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iter = args.pop();
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}
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return this.forDescendants(function(el) {
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if (iter) iter(el);
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el.emit.apply(el, args);
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}, true);
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};
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Node.prototype.emitAncestors = function() {
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var args = Array.prototype.slice(arguments)
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, iter;
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if (typeof args[args.length - 1] === 'function') {
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iter = args.pop();
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}
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return this.forAncestors(function(el) {
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if (iter) iter(el);
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el.emit.apply(el, args);
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}, true);
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};
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Node.prototype.hasDescendant = function(target) {
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return (function find(el) {
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for (var i = 0; i < el.children.length; i++) {
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if (el.children[i] === target) {
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return true;
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}
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if (find(el.children[i]) === true) {
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return true;
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}
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}
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return false;
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})(this);
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};
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Node.prototype.hasAncestor = function(target) {
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var el = this;
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while (el = el.parent) {
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if (el === target) return true;
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}
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return false;
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};
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Node.prototype.get = function(name, value) {
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if (this.data.hasOwnProperty(name)) {
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return this.data[name];
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}
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return value;
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};
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Node.prototype.set = function(name, value) {
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return this.data[name] = value;
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};
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/**
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* Expose
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*/
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module.exports = Node;
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