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Make onFillRequest always return a promise
This commit is contained in:
Richard van der Hoff 2016-01-04 16:28:32 +00:00
parent 89fcf019e1
commit b5eae891b4
2 changed files with 77 additions and 44 deletions
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33
src/components/structures/RoomView.js
View file

@ -43,6 +43,13 @@ var INITIAL_SIZE = 20;
var DEBUG_SCROLL = false;
if (DEBUG_SCROLL) {
// using bind means that we get to keep useful line numbers in the console
var debuglog = console.log.bind(console);
} else {
var debuglog = function () {};
}
module.exports = React.createClass({
displayName: 'RoomView',
propTypes: {
@ -344,7 +351,7 @@ module.exports = React.createClass({
},
_paginateCompleted: function() {
if (DEBUG_SCROLL) console.log("paginate complete");
debuglog("paginate complete");
this.setState({
room: MatrixClientPeg.get().getRoom(this.props.roomId)
@ -355,34 +362,34 @@ module.exports = React.createClass({
onSearchResultsFillRequest: function(backwards) {
if (!backwards)
return false;
return q(false);
if (this.nextSearchBatch) {
if (DEBUG_SCROLL) console.log("requesting more search results");
debuglog("requesting more search results");
return this._getSearchBatch(this.state.searchTerm,
this.state.searchScope).then(true);
} else {
if (DEBUG_SCROLL) console.log("no more search results");
return false;
debuglog("no more search results");
return q(false);
}
},
// set off a pagination request.
onMessageListFillRequest: function(backwards) {
if (!backwards)
return;
return q(false);
// Either wind back the message cap (if there are enough events in the
// timeline to do so), or fire off a pagination request.
if (this.state.messageCap < this.state.room.timeline.length) {
var cap = Math.min(this.state.messageCap + PAGINATE_SIZE, this.state.room.timeline.length);
if (DEBUG_SCROLL) console.log("winding back message cap to", cap);
debuglog("winding back message cap to", cap);
this.setState({messageCap: cap});
return true;
return q(true);
} else if(this.state.room.oldState.paginationToken) {
var cap = this.state.messageCap + PAGINATE_SIZE;
if (DEBUG_SCROLL) console.log("starting paginate to cap", cap);
debuglog("starting paginate to cap", cap);
this.setState({messageCap: cap, paginating: true});
return MatrixClientPeg.get().scrollback(this.state.room, PAGINATE_SIZE).
finally(this._paginateCompleted).then(true);
@ -492,7 +499,7 @@ module.exports = React.createClass({
}
this.nextSearchBatch = null;
this._getSearchBatch(term, scope);
this._getSearchBatch(term, scope).done();
},
// fire off a request for a batch of search results
@ -509,11 +516,11 @@ module.exports = React.createClass({
var self = this;
if (DEBUG_SCROLL) console.log("sending search request");
debuglog("sending search request");
return MatrixClientPeg.get().search({ body: this._getSearchCondition(term, scope),
next_batch: this.nextSearchBatch })
.then(function(data) {
if (DEBUG_SCROLL) console.log("search complete");
debuglog("search complete");
if (!self.state.searching || self.searchId != searchId) {
console.error("Discarding stale search results");
return;
@ -559,7 +566,7 @@ module.exports = React.createClass({
self.setState({
searchInProgress: false
});
}).done();
});
},
_getSearchCondition: function(term, scope) {

88
src/components/structures/ScrollPanel.js
View file

@ -21,6 +21,13 @@ var q = require("q");
var DEBUG_SCROLL = false;
if (DEBUG_SCROLL) {
// using bind means that we get to keep useful line numbers in the console
var debuglog = console.log.bind(console);
} else {
var debuglog = function () {};
}
/* This component implements an intelligent scrolling list.
*
* It wraps a list of <li> children; when items are added to the start or end
@ -54,13 +61,14 @@ module.exports = React.createClass({
* the user nears the start (backwards = true) or end (backwards =
* false) of the list.
*
* This should return true if the pagination was successful, or false if
* there is no more data in this directon (at this time) - which will
* stop the pagination cycle until the user scrolls again.
* This should return a promise; no more calls will be made until the
* promise completes.
*
* This can return a promise; if it does, no more calls will be made
* until the promise completes. The promise should resolve to true or
* false as above.
* The promise should resolve to true if there is more data to be
* retrieved in this direction (in which case onFillRequest may be
* called again immediately), or false if there is no more data in this
* directon (at this time) - which will stop the pagination cycle until
* the user scrolls again.
*/
onFillRequest: React.PropTypes.func,
@ -80,7 +88,7 @@ module.exports = React.createClass({
getDefaultProps: function() {
return {
stickyBottom: true,
onFillRequest: function(backwards) {},
onFillRequest: function(backwards) { return q(false); },
onScroll: function() {},
};
},
@ -106,7 +114,7 @@ module.exports = React.createClass({
onScroll: function(ev) {
var sn = this._getScrollNode();
if (DEBUG_SCROLL) console.log("Scroll event: offset now:", sn.scrollTop, "recentEventScroll:", this.recentEventScroll);
debuglog("Scroll event: offset now:", sn.scrollTop, "recentEventScroll:", this.recentEventScroll);
// Sometimes we see attempts to write to scrollTop essentially being
// ignored. (Or rather, it is successfully written, but on the next
@ -130,7 +138,7 @@ module.exports = React.createClass({
}
this.scrollState = this._calculateScrollState();
if (DEBUG_SCROLL) console.log("Saved scroll state", this.scrollState);
debuglog("Saved scroll state", this.scrollState);
this.props.onScroll(ev);
@ -145,12 +153,36 @@ module.exports = React.createClass({
checkFillState: function() {
var sn = this._getScrollNode();
// if there is less than a screenful of messages above or below the
// viewport, try to get some more messages.
//
// scrollTop is the number of pixels between the top of the content and
// the top of the viewport.
//
// scrollHeight is the total height of the content.
//
// clientHeight is the height of the viewport (excluding borders,
// margins, and scrollbars).
//
//
// .---------. - -
// | | | scrollTop |
// .-+---------+-. - - |
// | | | | | |
// | | | | | clientHeight | scrollHeight
// | | | | | |
// `-+---------+-' - |
// | | |
// | | |
// `---------' -
//
if (sn.scrollTop < sn.clientHeight) {
// there's less than a screenful of messages left - try to get some
// more messages.
// need to back-fill
this._maybeFill(true);
}
if (sn.scrollTop > sn.scrollHeight - sn.clientHeight * 2) {
// need to forward-fill
this._maybeFill(false);
}
},
@ -159,36 +191,30 @@ module.exports = React.createClass({
_maybeFill: function(backwards) {
var dir = backwards ? 'b' : 'f';
if (this._pendingFillRequests[dir]) {
if (DEBUG_SCROLL) {
console.log("ScrollPanel: Already a "+dir+" fill in progress - not starting another");
}
debuglog("ScrollPanel: Already a "+dir+" fill in progress - not starting another");
return;
}
if (DEBUG_SCROLL) {
console.log("ScrollPanel: starting "+dir+" fill");
}
debuglog("ScrollPanel: starting "+dir+" fill");
// onFillRequest can end up calling us recursively (via onScroll
// events) so make sure we set this before firing off the call. That
// does present the risk that we might not ever actually fire off the
// fill request, so wrap it in a try/catch.
this._pendingFillRequests[dir] = true;
var r;
var fillPromise;
try {
r = this.props.onFillRequest(backwards);
fillPromise = this.props.onFillRequest(backwards);
} catch (e) {
this._pendingFillRequests[dir] = false;
throw e;
}
q.finally(r, () => {
if (DEBUG_SCROLL) {
console.log("ScrollPanel: "+dir+" fill complete");
}
q.finally(fillPromise, () => {
debuglog("ScrollPanel: "+dir+" fill complete");
this._pendingFillRequests[dir] = false;
}).then((res) => {
if (res) {
}).then((hasMoreResults) => {
if (hasMoreResults) {
// further pagination requests have been disabled until now, so
// it's time to check the fill state again in case the pagination
// was insufficient.
@ -218,13 +244,13 @@ module.exports = React.createClass({
scrollToTop: function() {
this._getScrollNode().scrollTop = 0;
if (DEBUG_SCROLL) console.log("Scrolled to top");
debuglog("Scrolled to top");
},
scrollToBottom: function() {
var scrollNode = this._getScrollNode();
scrollNode.scrollTop = scrollNode.scrollHeight;
if (DEBUG_SCROLL) console.log("Scrolled to bottom; offset now", scrollNode.scrollTop);
debuglog("Scrolled to bottom; offset now", scrollNode.scrollTop);
},
// scroll the message list to the node with the given scrollToken. See
@ -261,10 +287,10 @@ module.exports = React.createClass({
this.recentEventScroll = scrollNode.scrollTop;
}
if (DEBUG_SCROLL) {
console.log("Scrolled to token", node.dataset.scrollToken, "+", pixelOffset+":", scrollNode.scrollTop, "(delta: "+scrollDelta+")");
console.log("recentEventScroll now "+this.recentEventScroll);
}
debuglog("Scrolled to token", node.dataset.scrollToken, "+",
pixelOffset+":", scrollNode.scrollTop,
"(delta: "+scrollDelta+")");
debuglog("recentEventScroll now "+this.recentEventScroll);
},
_calculateScrollState: function() {