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Code Issues Releases Wiki Activity

Move function to a private function

pull/21833/head
Travis Ralston 2020-06-07 13:08:25 -06:00
parent a7fe7cb28d
commit 760333a0ae
1 changed files with 63 additions and 60 deletions
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123
src/stores/room-list/algorithms/list-ordering/Algorithm.ts
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@ -65,66 +65,8 @@ export abstract class Algorithm extends EventEmitter {
}
public set stickyRoom(val: Room) {
// We wrap this in a closure because we can't use async setters.
// We need async so we can wait for handleRoomUpdate() to do its thing, otherwise
// we risk duplicating rooms.
(async () => {
// It's possible to have no selected room. In that case, clear the sticky room
if (!val) {
if (this._stickyRoom) {
// Lie to the algorithm and re-add the room to the algorithm
await this.handleRoomUpdate(this._stickyRoom.room, RoomUpdateCause.NewRoom);
}
this._stickyRoom = null;
return;
}
// When we do have a room though, we expect to be able to find it
const tag = this.roomIdsToTags[val.roomId][0];
if (!tag) throw new Error(`${val.roomId} does not belong to a tag and cannot be sticky`);
let position = this.cachedRooms[tag].indexOf(val);
if (position < 0) throw new Error(`${val.roomId} does not appear to be known and cannot be sticky`);
// 🐉 Here be dragons.
// Before we can go through with lying to the underlying algorithm about a room
// we need to ensure that when we do we're ready for the innevitable sticky room
// update we'll receive. To prepare for that, we first remove the sticky room and
// recalculate the state ourselves so that when the underlying algorithm calls for
// the same thing it no-ops. After we're done calling the algorithm, we'll issue
// a new update for ourselves.
const lastStickyRoom = this._stickyRoom;
console.log(`Last sticky room:`, lastStickyRoom);
this._stickyRoom = null;
this.recalculateStickyRoom();
// When we do have the room, re-add the old room (if needed) to the algorithm
// and remove the sticky room from the algorithm. This is so the underlying
// algorithm doesn't try and confuse itself with the sticky room concept.
if (lastStickyRoom) {
// Lie to the algorithm and re-add the room to the algorithm
await this.handleRoomUpdate(lastStickyRoom.room, RoomUpdateCause.NewRoom);
}
// Lie to the algorithm and remove the room from it's field of view
await this.handleRoomUpdate(val, RoomUpdateCause.RoomRemoved);
// Now that we're done lying to the algorithm, we need to update our position
// marker only if the user is moving further down the same list. If they're switching
// lists, or moving upwards, the position marker will splice in just fine but if
// they went downwards in the same list we'll be off by 1 due to the shifting rooms.
if (lastStickyRoom && lastStickyRoom.tag === tag && lastStickyRoom.position <= position) {
position++;
}
this._stickyRoom = {
room: val,
position: position,
tag: tag,
};
this.recalculateStickyRoom();
// Finally, trigger an update
this.emit(LIST_UPDATED_EVENT);
})();
// setters can't be async, so we call a private function to do the work
this.updateStickyRoom(val);
}
protected get hasFilters(): boolean {
@ -175,6 +117,67 @@ export abstract class Algorithm extends EventEmitter {
}
}
private async updateStickyRoom(val: Room) {
// Note throughout: We need async so we can wait for handleRoomUpdate() to do its thing,
// otherwise we risk duplicating rooms.
// It's possible to have no selected room. In that case, clear the sticky room
if (!val) {
if (this._stickyRoom) {
// Lie to the algorithm and re-add the room to the algorithm
await this.handleRoomUpdate(this._stickyRoom.room, RoomUpdateCause.NewRoom);
}
this._stickyRoom = null;
return;
}
// When we do have a room though, we expect to be able to find it
const tag = this.roomIdsToTags[val.roomId][0];
if (!tag) throw new Error(`${val.roomId} does not belong to a tag and cannot be sticky`);
let position = this.cachedRooms[tag].indexOf(val);
if (position < 0) throw new Error(`${val.roomId} does not appear to be known and cannot be sticky`);
// 🐉 Here be dragons.
// Before we can go through with lying to the underlying algorithm about a room
// we need to ensure that when we do we're ready for the innevitable sticky room
// update we'll receive. To prepare for that, we first remove the sticky room and
// recalculate the state ourselves so that when the underlying algorithm calls for
// the same thing it no-ops. After we're done calling the algorithm, we'll issue
// a new update for ourselves.
const lastStickyRoom = this._stickyRoom;
console.log(`Last sticky room:`, lastStickyRoom);
this._stickyRoom = null;
this.recalculateStickyRoom();
// When we do have the room, re-add the old room (if needed) to the algorithm
// and remove the sticky room from the algorithm. This is so the underlying
// algorithm doesn't try and confuse itself with the sticky room concept.
if (lastStickyRoom) {
// Lie to the algorithm and re-add the room to the algorithm
await this.handleRoomUpdate(lastStickyRoom.room, RoomUpdateCause.NewRoom);
}
// Lie to the algorithm and remove the room from it's field of view
await this.handleRoomUpdate(val, RoomUpdateCause.RoomRemoved);
// Now that we're done lying to the algorithm, we need to update our position
// marker only if the user is moving further down the same list. If they're switching
// lists, or moving upwards, the position marker will splice in just fine but if
// they went downwards in the same list we'll be off by 1 due to the shifting rooms.
if (lastStickyRoom && lastStickyRoom.tag === tag && lastStickyRoom.position <= position) {
position++;
}
this._stickyRoom = {
room: val,
position: position,
tag: tag,
};
this.recalculateStickyRoom();
// Finally, trigger an update
this.emit(LIST_UPDATED_EVENT);
}
protected recalculateFilteredRooms() {
if (!this.hasFilters) {
return;