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Fix navigation in a message replies section.

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This commit is contained in:
John Preston 2020-08-31 16:14:32 +04:00
parent 1849f01b15
commit c563df7d9d
5 changed files with 61 additions and 25 deletions
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47
Telegram/SourceFiles/data/data_replies_list.cpp
View file

@ -20,7 +20,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
namespace Data {
namespace {
constexpr auto kMessagesPerPage = 4; // #TODO replies
constexpr auto kMessagesPerPage = 16;
} // namespace
@ -94,8 +94,8 @@ bool RepliesList::buildFromData(not_null<Viewer*> viewer) {
const auto around = viewer->around;
if (_list.empty()
|| (!around && _skippedAfter != 0)
|| (around > 0 && around < _list.back())
|| (around > _list.front())) {
|| (around > _list.front() && _skippedAfter != 0)
|| (around > 0 && around < _list.back() && _skippedBefore != 0)) {
loadAround(around);
return false;
}
@ -207,6 +207,13 @@ void RepliesList::loadAround(MsgId id) {
_list.clear();
if (processMessagesIsEmpty(result)) {
_fullCount = _skippedBefore = _skippedAfter = 0;
} else if (id > 0) {
Assert(!_list.empty());
if (_list.front() <= id) {
_skippedAfter = 0;
} else if (_list.back() >= id) {
_skippedBefore = 0;
}
}
}).fail([=](const RPCError &error) {
_beforeId = 0;
@ -312,7 +319,8 @@ void RepliesList::loadAfter() {
bool RepliesList::processMessagesIsEmpty(const MTPmessages_Messages &result) {
const auto guard = gsl::finally([&] { _partLoaded.fire({}); });
_fullCount = result.match([&](const MTPDmessages_messagesNotModified &) {
const auto fullCount = result.match([&](
const MTPDmessages_messagesNotModified &) {
LOG(("API Error: received messages.messagesNotModified! "
"(HistoryWidget::messagesReceived)"));
return 0;
@ -346,7 +354,8 @@ bool RepliesList::processMessagesIsEmpty(const MTPmessages_Messages &result) {
}
const auto id = IdFromMessage(list.front());
const auto toFront = !_list.empty() && (id > _list.front());
const auto wasSize = int(_list.size());
const auto toFront = (wasSize > 0) && (id > _list.front());
const auto clientFlags = MTPDmessage_ClientFlags();
const auto type = NewMessageType::Existing;
auto refreshed = std::vector<MsgId>();
@ -368,11 +377,31 @@ bool RepliesList::processMessagesIsEmpty(const MTPmessages_Messages &result) {
refreshed.insert(refreshed.end(), _list.begin(), _list.end());
_list = std::move(refreshed);
}
if (_fullCount.current() && _skippedBefore && !_skippedAfter) {
_skippedAfter = *_fullCount.current() - *_skippedBefore - _list.size();
} else if (_fullCount.current() && _skippedAfter && !_skippedBefore) {
_skippedBefore = *_fullCount.current() - *_skippedAfter - _list.size();
const auto nowSize = int(_list.size());
auto &decrementFrom = toFront ? _skippedAfter : _skippedBefore;
if (decrementFrom.has_value()) {
*decrementFrom = std::max(
*decrementFrom - (nowSize - wasSize),
0);
}
const auto checkedCount = std::max(fullCount, nowSize);
if (_skippedBefore && _skippedAfter) {
auto &correct = toFront ? _skippedBefore : _skippedAfter;
*correct = std::max(
checkedCount - *decrementFrom - nowSize,
0);
*decrementFrom = *_fullCount.current() - *correct - nowSize;
Assert(*decrementFrom >= 0);
} else if (_skippedBefore) {
*_skippedBefore = std::min(*_skippedBefore, checkedCount - nowSize);
_skippedAfter = checkedCount - *_skippedBefore - nowSize;
} else if (_skippedAfter) {
*_skippedAfter = std::min(*_skippedAfter, checkedCount - nowSize);
_skippedBefore = checkedCount - *_skippedAfter - nowSize;
}
_fullCount = checkedCount;
return false;
}

13
Telegram/SourceFiles/history/view/history_view_list_widget.cpp
View file

@ -455,6 +455,15 @@ void ListWidget::highlightMessage(FullMsgId itemId) {
}
}
void ListWidget::showAroundPosition(
Data::MessagePosition position,
Fn<bool()> overrideInitialScroll) {
_aroundPosition = position;
_aroundIndex = -1;
_overrideInitialScroll = std::move(overrideInitialScroll);
refreshViewer();
}
void ListWidget::updateHighlightedMessage() {
if (const auto item = session().data().message(_highlightedMessageId)) {
if (const auto view = viewForItem(item)) {
@ -486,7 +495,9 @@ void ListWidget::saveScrollState() {
}
void ListWidget::restoreScrollState() {
if (_items.empty()) {
if (_items.empty()
|| (_overrideInitialScroll
&& base::take(_overrideInitialScroll)())) {
return;
}
if (!_scrollTopState.item) {

4
Telegram/SourceFiles/history/view/history_view_list_widget.h
View file

@ -164,6 +164,9 @@ public:
bool isAbovePosition(Data::MessagePosition position) const;
bool isBelowPosition(Data::MessagePosition position) const;
void highlightMessage(FullMsgId itemId);
void showAroundPosition(
Data::MessagePosition position,
Fn<bool()> overrideInitialScroll);
TextForMimeData getSelectedText() const;
MessageIdsList getSelectedItems() const;
@ -472,6 +475,7 @@ private:
int _visibleTopFromItem = 0;
ScrollTopState _scrollTopState;
Ui::Animations::Simple _scrollToAnimation;
Fn<bool()> _overrideInitialScroll;
bool _scrollDateShown = false;
Ui::Animations::Simple _scrollDateOpacity;

20
Telegram/SourceFiles/history/view/history_view_replies_section.cpp
View file

@ -780,19 +780,10 @@ void RepliesWidget::scrollDownClicked() {
}
void RepliesWidget::showAtPosition(Data::MessagePosition position) {
if (showAtPositionNow(position)) {
if (const auto highlight = base::take(_highlightMessageId)) {
_inner->highlightMessage(highlight);
}
} else {
_nextAnimatedScrollPosition = position;
_nextAnimatedScrollDelta = _inner->isBelowPosition(position)
? -_scroll->height()
: _inner->isAbovePosition(position)
? _scroll->height()
: 0;
auto memento = HistoryView::ListMemento(position);
_inner->restoreState(&memento);
if (!showAtPositionNow(position)) {
_inner->showAroundPosition(position, [=] {
return showAtPositionNow(position);
});
}
}
@ -810,6 +801,9 @@ bool RepliesWidget::showAtPositionNow(Data::MessagePosition position) {
(std::abs(fullDelta) > limit
? HistoryView::ListWidget::AnimatedScroll::Part
: HistoryView::ListWidget::AnimatedScroll::Full));
if (const auto highlight = base::take(_highlightMessageId)) {
_inner->highlightMessage(highlight);
}
return true;
}
return false;

2
Telegram/SourceFiles/history/view/history_view_replies_section.h
View file

@ -213,8 +213,6 @@ private:
bool _skipScrollEvent = false;
FullMsgId _highlightMessageId;
std::optional<Data::MessagePosition> _nextAnimatedScrollPosition;
int _nextAnimatedScrollDelta = 0;
Ui::Animations::Simple _scrollDownShown;
bool _scrollDownIsShown = false;