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![](https://lively-kernel.org/lively4/lively4-core/demos/lively-simulation/screenshots/state.png){width=500px}\nMD*/\n\n\"enable aexpr\";\n\nimport Morph from 'src/components/widgets/lively-morph.js';\nimport _ from 'src/external/lodash/lodash.js';\n\nconst DEFAULT_STATE = '{}';\n\nexport default class LivelySimulationState extends Morph {\n\n constructor() {\n super();\n this.state = DEFAULT_STATE;\n }\n \n // life cycle\n initialize() {\n this.initializeEntries();\n this.initializeSaveDiscard();\n }\n \n initializeEntries() {\n const entries = this.get('#entries');\n entries.addEventListener('focusin', () => this.handleFocusIn());\n }\n\n initializeState(state = DEFAULT_STATE) {\n this.isEditing = false;\n this.setStateFromJSON(state);\n }\n\n initializeSaveDiscard() {\n const save = this.get('#save');\n save.addEventListener('click', () => this.handleSaveDiscard(true));\n const discard = this.get('#discard');\n discard.addEventListener('click', () => this.handleSaveDiscard(false));\n }\n\n // event listener\n handleFocusIn() {\n if (!this.isEditing) {\n this.isEditing = true;\n this.checkpoint = this.entriesToStateJSON();\n this.get('#saveDiscard').classList.add('show');\n this.get('#entries').classList.add('edit');\n }\n }\n\n handleSaveDiscard(save) {\n this.get('#saveDiscard').classList.remove('show');\n this.get('#entries').classList.remove('edit');\n this.isEditing = false;\n if (save) this.save();\n else this.discard();\n }\n \n handleDelete(entry) {\n entry.remove();\n if (!this.hasEmptyEntry()) this.addEmptyEntry();\n }\n\n // other\n save() {\n try {\n this.setState(this.entriesToState());\n const codeView = this.getCodeView();\n if (codeView && codeView.preCompile) codeView.preCompile(); \n this.clearError();\n } catch ({ message }) {\n this.setError(message);\n }\n }\n\n discard() {\n this.setStateFromJSON(this.checkpoint);\n }\n\n getState() {\n return this.state;\n }\n\n get(selector) {\n const { shadowRoot } = this;\n return shadowRoot.querySelector(selector);\n }\n\n setState(state) {\n const stateWithUnits = _.mapValues(state, (entry, key) => ({\n unit: _.isObject(entry) ? _.get(entry, 'unit', '') : this.state[key] && this.state[key].unit || '',\n value: _.isObject(entry) ? _.get(entry, 'value', 0) : entry\n }));\n this.state = stateWithUnits;\n if (this.isEditing) return;\n this.updateEntries();\n }\n\n setStateFromJSON(json) {\n const state = JSON.parse(json);\n this.setState(state);\n }\n\n setError(error) {\n const status = this.get('#status');\n status.innerText = error;\n status.classList.add('error');\n }\n\n clearError() {\n const status = this.get('#status');\n status.innerText = '';\n status.classList.remove('error');\n }\n\n isFocused() {\n const { shadowRoot } = this;\n return _.some(shadowRoot.querySelectorAll('input'), input => this.isChildFocused(input));\n }\n\n isChildFocused(child, doc = document) {\n if (doc.activeElement === child) return true;\n if (doc.activeElement && doc.activeElement.shadowRoot)\n\t\t\treturn this.isChildFocused(child, doc.activeElement.shadowRoot)\n return false;\n }\n \n entriesToState() {\n const json = this.entriesToStateJSON();\n return json && JSON.parse(json);\n }\n \n entriesToStateJSON() {\n const entries = _.map([...this.get('#entries').children], entry => ([\n entry.getKey(), \n {\n value: isNaN(entry.getValue()) ? entry.getValue() : parseFloat(entry.getValue()),\n unit: entry.getUnit()\n }\n ]));\n const filteredEntries = _.reject(entries, ([ key ]) => _.isEmpty(key.trim()));\n const entriesAsJson = _.map(filteredEntries, (entry) => JSON.stringify(_.fromPairs([entry])).slice(1, -1));\n return `{\n ${\n _.join(entriesAsJson, ',\\n')\n }\n }`;\n }\n \n updateEntries() {\n const { state } = this;\n const entriesState = this.entriesToState();\n if (_.isEqual(state, entriesState) && this.hasEmptyEntry()) return;\n if (_.isEqual(_.keys(state), _.keys(entriesState))) this.updateEntryValues();\n else this.replaceEntries();\n }\n \n updateEntryValues() {\n const { state } = this;\n if (_.isEqual(state, {})) return this.addEmptyEntry();\n const entries = _.reject([...this.get('#entries').children], entry => _.isEmpty(entry.getKey().trim()));\n _.forEach(entries, entry => {\n const value = state[entry.getKey()].value;\n entry.setValue(isNaN(value) ? value : parseFloat(value.toFixed(3)));\n });\n this.ensureEmpty();\n }\n \n replaceEntries() {\n const { state } = this;\n const entries = this.get('#entries');\n entries.innerHTML = ''; // no diffing, just plain remove all + add\n const newEntries = _.map(_.toPairs(state), ([key, { unit, value }]) => this.createEntry(key, isNaN(value) ? value : parseFloat(value.toFixed(3)), unit));\n _.forEach(newEntries, (entry) => entries.appendChild(entry));\n this.addEmptyEntry();\n }\n \n hasEmptyEntry() {\n return _.some([...this.get('#entries').children], entry => _.isEmpty(entry.getKey().trim()) && _.isEmpty(entry.getValue().trim()));\n }\n \n addEmptyEntry() {\n const entries = this.get('#entries');\n entries.appendChild(this.createEntry('', '', ''));\n }\n \n ensureEmpty(entry) {\n if (!this.hasEmptyEntry()) this.addEmptyEntry();\n if (entry) entry.focus();\n }\n \n createEntry(key, value, unit) {\n const entry = (\n
\n \n \n \n \n
\n );\n entry.children[0].addEventListener('input', () => this.ensureEmpty(entry));\n entry.children[1].addEventListener('input', () => this.ensureEmpty(entry));\n entry.children[2].addEventListener('input', () => this.ensureEmpty(entry));\n entry.children[3].addEventListener('mousedown', () => this.handleDelete(entry));\n entry.getKey = () => entry.children[0].value;\n entry.getValue = () => entry.children[1].value;\n entry.getUnit = () => entry.children[2].value;\n entry.setValue = (value) => entry.children[1].value = value;\n return entry;\n }\n \n getCodeView() {\n return this.getRootNode().host;\n }\n}\n"]}