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Fix scrolling flickering on backwards pagination

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This commit is contained in:
Konstantinos Sideris 2017-06-05 19:21:19 +03:00
parent 95c492bad8
commit 36d25951dc
2 changed files with 21 additions and 7 deletions
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6
include/TimelineView.h
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@ -111,12 +111,16 @@ private:
bool isInitialized = false;
bool isTimelineFinished = false;
bool isInitialSync = true;
bool isPaginationScrollPending_ = false;
const int SCROLL_BAR_GAP = 300;
const int SCROLL_BAR_GAP = 400;
int scroll_height_ = 0;
int previous_max_height_ = 0;
int oldPosition_;
int oldHeight_;
QList<PendingMessage> pending_msgs_;
QSharedPointer<MatrixClient> client_;
};

22
src/TimelineView.cc
View file

@ -58,6 +58,15 @@ void TimelineView::sliderRangeChanged(int min, int max)
if (max - scroll_area_->verticalScrollBar()->value() < SCROLL_BAR_GAP)
scroll_area_->verticalScrollBar()->setValue(max);
if (isPaginationScrollPending_) {
isPaginationScrollPending_ = false;
int currentHeight = scroll_widget_->size().height();
int diff = currentHeight - oldHeight_;
scroll_area_->verticalScrollBar()->setValue(oldPosition_ + diff);
}
}
void TimelineView::scrollDown()
@ -88,17 +97,14 @@ void TimelineView::sliderMoved(int position)
return;
// Prevent user from moving up when there is pagination in progress.
if (isPaginationInProgress_) {
scroll_area_->verticalScrollBar()->setValue(SCROLL_BAR_GAP);
// TODO: Keep a map of the event ids to filter out duplicates.
if (isPaginationInProgress_)
return;
}
isPaginationInProgress_ = true;
scroll_height_ = scroll_area_->verticalScrollBar()->value();
previous_max_height_ = scroll_area_->verticalScrollBar()->maximum();
// FIXME: Maybe move this to TimelineViewManager to remove the extra calls?
client_.data()->messages(room_id_, prev_batch_token_);
client_->messages(room_id_, prev_batch_token_);
}
}
@ -130,11 +136,15 @@ void TimelineView::addBackwardsEvents(const QString &room_id, const RoomMessages
// Reverse again to render them.
std::reverse(items.begin(), items.end());
oldPosition_ = scroll_area_->verticalScrollBar()->value();
oldHeight_ = scroll_widget_->size().height();
for (const auto &item : items)
addTimelineItem(item, TimelineDirection::Top);
prev_batch_token_ = msgs.end();
isPaginationInProgress_ = false;
isPaginationScrollPending_ = true;
}
TimelineItem *TimelineView::parseMessageEvent(const QJsonObject &event, TimelineDirection direction)