Vihren Atlas

observableFromEvent.ts ×5

Code frontier

unlabeled · c_0b19ee158d8d

160 tests · 6639 LOC · 59 files · introduces 0 tests · 28 LOC · 1 file

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Code
5 ranges28 lines · 1 files
Tests
0 tests

Contains — complete concept membership

All code (extent)
986 ranges6639 lines · 59 files · Browse complete extent
All tests (intent)
160 testsBrowse complete intent

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Introduced tests

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No tests are introduced at this concept. Its intent tests are introduced by other concepts.

Introduced code

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1 file ranked by introduced lines: 28 introduced LOC across 5 ranges. Expand a file to inspect source; the > gutter marks introduced lines.

src/vs/base/common/observableInternal/observables/observableFromEvent.ts 28 introduced LOC · 5 ranges

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93
94 protected override onFirstObserverAdded(): void {
95 > this._subscription = this.event(this.handleEvent); observableFromEvent.ts
96 > }
97
98 private readonly handleEvent = (args: TArgs | undefined) => {
99 > const newValue = this._getValue(args); observableFromEvent.ts
100 > const oldValue = this._value;
101 >
102 > const didChange = !this._hasValue || !(this._equalityComparator(oldValue!, newValue));
103 > let didRunTransaction = false;
104 >
105 > if (didChange) {
106 > this._value = newValue;
107 >
108 > if (this._hasValue) {
109 didRunTransaction = true;
110 subtransaction(
124 );
125 }
126 > this._hasValue = true; observableFromEvent.ts
127 > }
128 >
129 > if (!didRunTransaction) {
130 > getLogger()?.handleObservableUpdated(this, { oldValue, newValue, change: undefined, didChange, hadValue: this._hasValue });
131 > }
132 > };
133
134 protected override onLastObserverRemoved(): void {
135 > this._subscription!.dispose(); observableFromEvent.ts
136 > this._subscription = undefined;
137 > this._hasValue = false;
138 > this._value = undefined;
139 > }
140
141 public get(): T {
142 if (this._subscription) {
143 > if (!this._hasValue) { observableFromEvent.ts
144 > this.handleEvent(undefined);
145 > }
146 > return this._value!;
147 } else {
148 // no cache, as there are no subscribers to keep it updated

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