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Introduce a RoomScrollStateStore

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to keep the place we're scrolled to in rooms. This mainly eleimates
the extra, superfluous onRoomViewStoreUpdate callback that
happened when the previous room saved back its scroll state.
Moving the scroll state to a separate store means we can have this
not emit events because nothing needs to know when the scroll state
changes.
This commit is contained in:
David Baker
2017-09-07 17:08:36 +01:00
parent d71f15adf4
commit 408b8c18ea
3 changed files with 59 additions and 50 deletions
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42
src/components/structures/RoomView.js
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@ -47,6 +47,7 @@ import KeyCode from '../../KeyCode';
import UserProvider from '../../autocomplete/UserProvider';
import RoomViewStore from '../../stores/RoomViewStore';
import RoomScrollStateStore from '../../stores/RoomScrollStateStore';
let DEBUG = false;
let debuglog = function() {};
@ -163,7 +164,6 @@ module.exports = React.createClass({
roomLoadError: RoomViewStore.getRoomLoadError(),
joining: RoomViewStore.isJoining(),
initialEventId: RoomViewStore.getInitialEventId(),
initialEventPixelOffset: RoomViewStore.getInitialEventPixelOffset(),
isInitialEventHighlighted: RoomViewStore.isInitialEventHighlighted(),
forwardingEvent: RoomViewStore.getForwardingEvent(),
shouldPeek: RoomViewStore.shouldPeek(),
@ -191,18 +191,32 @@ module.exports = React.createClass({
newState.room = MatrixClientPeg.get().getRoom(newState.roomId);
}
if (this.state.roomId !== newState.roomId) {
// Store the scroll state for the previous room so that we can return to this
// position when viewing this room in future.
if (this.state.roomId) {
RoomScrollStateStore.setScrollState(this.state.roomId, this._getScrollState());
}
// ...and get the scroll state for the new room
// If an event ID wasn't specified, default to the one saved for this room
// via update_scroll_state. Assume initialEventPixelOffset should be set.
if (!newState.initialEventId) {
const roomScrollState = RoomScrollStateStore.getScrollState(newState.roomId);
if (roomScrollState) {
newState.initialEventId = roomScrollState.focussedEvent;
newState.initialEventPixelOffset = roomScrollState.pixelOffset;
}
}
}
// Clear the search results when clicking a search result (which changes the
// currently scrolled to event, this.state.initialEventId).
if (this.state.initialEventId !== newState.initialEventId) {
newState.searchResults = null;
}
// Store the scroll state for the previous room so that we can return to this
// position when viewing this room in future.
if (this.state.roomId !== newState.roomId) {
this._updateScrollMap(this.state.roomId);
}
this.setState(newState, () => {
// At this point, this.state.roomId could be null (e.g. the alias might not
// have been resolved yet) so anything called here must handle this case.
@ -340,7 +354,7 @@ module.exports = React.createClass({
this.unmounted = true;
// update the scroll map before we get unmounted
this._updateScrollMap(this.state.roomId);
RoomScrollStateStore.setScrollState(this.state.roomId, this._getScrollState());
if (this.refs.roomView) {
// disconnect the D&D event listeners from the room view. This
@ -617,18 +631,6 @@ module.exports = React.createClass({
});
},
_updateScrollMap(roomId) {
// No point updating scroll state if the room ID hasn't been resolved yet
if (!roomId) {
return;
}
dis.dispatch({
action: 'update_scroll_state',
room_id: roomId,
scroll_state: this._getScrollState(),
});
},
onRoom: function(room) {
if (!room || room.roomId !== this.state.roomId) {
return;