@angular/fire
Version:
The official Angular library for Firebase.
85 lines • 11.7 kB
JavaScript
import { fromRef } from '../observable/fromRef';
import { merge, of } from 'rxjs';
import { isNil } from '../utils';
import { distinctUntilChanged, scan, switchMap } from 'rxjs/operators';
export function listChanges(ref, events, scheduler) {
return fromRef(ref, 'value', 'once', scheduler).pipe(switchMap(snapshotAction => {
const childEvent$ = [of(snapshotAction)];
events.forEach(event => childEvent$.push(fromRef(ref, event, 'on', scheduler)));
return merge(...childEvent$).pipe(scan(buildView, []));
}), distinctUntilChanged());
}
function positionFor(changes, key) {
const len = changes.length;
for (let i = 0; i < len; i++) {
if (changes[i].payload.key === key) {
return i;
}
}
return -1;
}
function positionAfter(changes, prevKey) {
if (isNil(prevKey)) {
return 0;
}
else {
const i = positionFor(changes, prevKey);
if (i === -1) {
return changes.length;
}
else {
return i + 1;
}
}
}
function buildView(current, action) {
const { payload, prevKey, key } = action;
const currentKeyPosition = positionFor(current, key);
const afterPreviousKeyPosition = positionAfter(current, prevKey);
switch (action.type) {
case 'value':
if (action.payload && action.payload.exists()) {
let prevKey = null;
action.payload.forEach(payload => {
const action = { payload, type: 'value', prevKey, key: payload.key };
prevKey = payload.key;
current = [...current, action];
return false;
});
}
return current;
case 'child_added':
if (currentKeyPosition > -1) {
// check that the previouskey is what we expect, else reorder
const previous = current[currentKeyPosition - 1];
if ((previous && previous.key || null) !== prevKey) {
current = current.filter(x => x.payload.key !== payload.key);
current.splice(afterPreviousKeyPosition, 0, action);
}
}
else if (prevKey == null) {
return [action, ...current];
}
else {
current = current.slice();
current.splice(afterPreviousKeyPosition, 0, action);
}
return current;
case 'child_removed':
return current.filter(x => x.payload.key !== payload.key);
case 'child_changed':
return current.map(x => x.payload.key === key ? action : x);
case 'child_moved':
if (currentKeyPosition > -1) {
const data = current.splice(currentKeyPosition, 1)[0];
current = current.slice();
current.splice(afterPreviousKeyPosition, 0, data);
return current;
}
return current;
// default will also remove null results
default:
return current;
}
}
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i < len; i++) {\n    if (changes[i].payload.key === key) {\n      return i;\n    }\n  }\n  return -1;\n}\n\nfunction positionAfter<T>(changes: SnapshotAction<T>[], prevKey?: string) {\n  if (isNil(prevKey)) {\n    return 0;\n  } else {\n    const i = positionFor(changes, prevKey);\n    if (i === -1) {\n      return changes.length;\n    } else {\n      return i + 1;\n    }\n  }\n}\n\nfunction buildView(current, action) {\n  const { payload, prevKey, key } = action;\n  const currentKeyPosition = positionFor(current, key);\n  const afterPreviousKeyPosition = positionAfter(current, prevKey);\n  switch (action.type) {\n    case 'value':\n      if (action.payload && action.payload.exists()) {\n        let prevKey = null;\n        action.payload.forEach(payload => {\n          const action = { payload, type: 'value', prevKey, key: payload.key };\n          prevKey = payload.key;\n          current = [...current, action];\n          return false;\n        });\n      }\n      return current;\n    case 'child_added':\n      if (currentKeyPosition > -1) {\n        // check that the previouskey is what we expect, else reorder\n        const previous = current[currentKeyPosition - 1];\n        if ((previous && previous.key || null) !== prevKey) {\n          current = current.filter(x => x.payload.key !== payload.key);\n          current.splice(afterPreviousKeyPosition, 0, action);\n        }\n      } else if (prevKey == null) {\n        return [action, ...current];\n      } else {\n        current = current.slice();\n        current.splice(afterPreviousKeyPosition, 0, action);\n      }\n      return current;\n    case 'child_removed':\n      return current.filter(x => x.payload.key !== payload.key);\n    case 'child_changed':\n      return current.map(x => x.payload.key === key ? action : x);\n    case 'child_moved':\n      if (currentKeyPosition > -1) {\n        const data = current.splice(currentKeyPosition, 1)[0];\n        current = current.slice();\n        current.splice(afterPreviousKeyPosition, 0, data);\n        return current;\n      }\n      return current;\n    // default will also remove null results\n    default:\n      return current;\n  }\n}\n"]}