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144 lines
3.5 KiB
144 lines
3.5 KiB
/*
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** Zabbix
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** Copyright (C) 2001-2023 Zabbix SIA
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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**/
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/**
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* A stack implementation for identified overlay objects.
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*
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* @prop {int} length Overlay collection size.
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* @prop {array} stack Array of overlay identifiers.
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* @prop {object} map Overlay objects keyed by their identifiers.
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*/
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function OverlayCollection() {
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this.stack = [];
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this.map = {};
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}
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Object.defineProperty(OverlayCollection.prototype, 'length', {
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get: function () {
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return this.stack.length;
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},
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writeable: false
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});
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/**
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* Fetches overlay object positioned at top of stack.
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*
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* @return {object|undefined} Overlay object currently in top of stack.
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*/
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OverlayCollection.prototype.end = function() {
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return this.getById(this.stack[this.length - 1]);
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};
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/**
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* Retrieve overlay by it's ID.
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*
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* @param {string} id Overlay identifier.
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*
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* @return {Overlay|undefined} Overlay object.
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*/
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OverlayCollection.prototype.getById = function(id) {
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return this.map[id];
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};
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/**
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* Adds new overlay to the stack or, if it already exists, moves it to the top of the stack.
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*
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* @param {object} Overlay object.
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*/
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OverlayCollection.prototype.pushUnique = function(overlay) {
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if (this.map[overlay.dialogueid]) {
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this._restackEnd(overlay.dialogueid);
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}
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else {
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this._write(overlay, this.length);
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}
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};
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/**
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* Removes an overlay object, returns a reference.
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*
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* @param {string} id An overlay identifier.
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*
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* @return {object|undefined} Overlay object that is no longer in this stack.
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*/
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OverlayCollection.prototype.removeById = function(id) {
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var overlay = this.getById(id);
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if (overlay) {
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delete this.map[id];
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this.stack.splice(this._fetchIndex(id), 1);
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}
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return overlay;
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};
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/**
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* Get unused overlay id.
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*
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* @return {string}
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*/
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OverlayCollection.prototype.getNextId = function() {
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var overlayid = Math.random().toString(36).substring(7);
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while (this.stack.indexOf(overlayid) !== -1) {
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overlayid = Math.random().toString(36).substring(7);
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}
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return overlayid;
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};
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/**
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* Retrieves overlay Z-index by ID.
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*
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* @param {string} id Overlay object identifier.
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*
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* @throws Error
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*
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* @return {int} Position in stack.
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*/
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OverlayCollection.prototype._fetchIndex = function(id) {
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for (var i = this.length - 1; i >= 0; i--) {
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if (this.stack[i] == id) {
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return i;
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}
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}
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throw new Error('Fetching nonexistent overlay: ' + id);
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};
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/**
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* Moves an overlay to the top of stack.
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*
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* @param {string} id An overlay identifier.
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*/
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OverlayCollection.prototype._restackEnd = function(id) {
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this.stack.splice(this._fetchIndex(id), 1);
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this.stack.push(id);
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};
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/**
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* @param {object} overlay Overlay object.
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* @param {int} position Z-index for overlay object.
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*/
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OverlayCollection.prototype._write = function(overlay, position) {
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this.stack[position] = overlay.dialogueid;
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this.map[overlay.dialogueid] = overlay;
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};
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