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Improve animated scroll to message.

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Use it in replies navigation and in jumping to message history end.
This commit is contained in:
John Preston 2017-05-24 16:22:27 +03:00
parent 25587d7e8e
commit 972b5078f6
2 changed files with 86 additions and 26 deletions
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110
Telegram/SourceFiles/historywidget.cpp
View File

@ -668,20 +668,82 @@ void HistoryWidget::scrollToCurrentVoiceMessage(FullMsgId fromId, FullMsgId toId
auto scrollBottom = scrollTop + _scroll->height();
auto toBottom = toTop + to->height();
if ((toTop < scrollTop && toBottom < scrollBottom) || (toTop > scrollTop && toBottom > scrollBottom)) {
auto scrollTo = snap(itemTopForHighlight(to), 0, _scroll->scrollTopMax());
_scrollToMediaMessageAnimation.finish();
_scrollToMediaMessageAnimation.start([this, toId] {
auto toTop = _list->itemTop(App::histItemById(toId));
if (toTop < 0) {
_scrollToMediaMessageAnimation.finish();
} else {
synteticScrollToY(qRound(_scrollToMediaMessageAnimation.current()) + toTop);
}
}, scrollTop - toTop, scrollTo - toTop, 200, anim::sineInOut);
animatedScrollToItem(to->id);
}
}
}
void HistoryWidget::animatedScrollToItem(MsgId msgId) {
Expects(_history != nullptr);
auto animatedScrollAttachedToItem = [this](HistoryItem *item, int scrollTo) {
auto itemTop = _list->itemTop(item);
if (itemTop < 0) {
return false;
}
auto maxAnimatedDelta = _scroll->height();
auto transition = anim::sineInOut;
auto scrollTop = _scroll->scrollTop();
if (scrollTo > scrollTop + maxAnimatedDelta) {
scrollTop = scrollTo - maxAnimatedDelta;
synteticScrollToY(scrollTop);
transition = anim::easeOutCubic;
} else if (scrollTo + maxAnimatedDelta < scrollTop) {
scrollTop = scrollTo + maxAnimatedDelta;
synteticScrollToY(scrollTop);
transition = anim::easeOutCubic;
}
_scrollToMediaMessageAnimation.finish();
_scrollToMediaMessageAnimation.start([this, itemId = item->fullId()] {
auto itemTop = _list->itemTop(App::histItemById(itemId));
if (itemTop < 0) {
_scrollToMediaMessageAnimation.finish();
} else {
synteticScrollToY(qRound(_scrollToMediaMessageAnimation.current()) + itemTop);
}
}, scrollTop - itemTop, scrollTo - itemTop, st::slideDuration, anim::sineInOut);
return true;
};
if (msgId == ShowAtUnreadMsgId) {
// Special case "scroll to bottom".
auto scrollTo = _scroll->scrollTopMax();
// Attach our scroll animation to some item.
auto item = _history->isEmpty() ? nullptr : _history->blocks.back()->items.back();
if (animatedScrollAttachedToItem(item, scrollTo)) {
return;
}
// If something went wrong we just scroll without animation.
synteticScrollToY(scrollTo);
return;
}
auto to = App::histItemById(_channel, msgId);
auto scrollTo = snap(itemTopForHighlight(to), 0, _scroll->scrollTopMax());
animatedScrollAttachedToItem(to, scrollTo);
}
void HistoryWidget::highlightMessage(HistoryItem *context) {
Expects(_list != nullptr);
_animActiveStart = getms();
_animActiveTimer.start(AnimationTimerDelta);
_activeAnimMsgId = _showAtMsgId;
if (context
&& context->history() == _history
&& context->isGroupMigrate()
&& _migrated
&& !_migrated->isEmpty()
&& _migrated->loadedAtBottom()
&& _migrated->blocks.back()->items.back()->isGroupMigrate()
&& _list->historyTop() != _list->historyDrawTop()) {
_activeAnimMsgId = -_migrated->blocks.back()->items.back()->id;
}
}
int HistoryWidget::itemTopForHighlight(HistoryItem *item) const {
auto itemTop = _list->itemTop(item);
auto heightLeft = (_scroll->height() - item->height());
@ -1707,6 +1769,9 @@ void HistoryWidget::showHistory(const PeerId &peerId, MsgId showAtMsgId, bool re
bool canShowNow = _history->isReadyFor(showAtMsgId);
if (!canShowNow) {
delayedShowAt(showAtMsgId);
App::main()->dlgUpdated(wasHistory ? wasHistory->peer : nullptr, wasMsgId);
emit historyShown(_history, _showAtMsgId);
} else {
_history->forgetScrollState();
if (_migrated) {
@ -1722,13 +1787,14 @@ void HistoryWidget::showHistory(const PeerId &peerId, MsgId showAtMsgId, bool re
}
}
_showAtMsgId = showAtMsgId;
_histInited = false;
historyLoaded();
setMsgId(showAtMsgId);
if (_histInited) {
animatedScrollToItem(_showAtMsgId);
highlightMessage(App::histItemById(_channel, _showAtMsgId));
} else {
historyLoaded();
}
}
App::main()->dlgUpdated(wasHistory ? wasHistory->peer : nullptr, wasMsgId);
emit historyShown(_history, _showAtMsgId);
_topBar->update();
update();
@ -2452,7 +2518,6 @@ void HistoryWidget::messagesReceived(PeerData *peer, const MTPmessages_Messages
setMsgId(_delayedShowAtMsgId);
_histInited = false;
historyLoaded();
}
}
@ -4841,9 +4906,7 @@ void HistoryWidget::updateListSize(bool initial, bool loadedDown, const ScrollCh
return updateListSize(initial, false, change);
} else {
toY = itemTopForHighlight(item);
_animActiveStart = getms();
_animActiveTimer.start(AnimationTimerDelta);
_activeAnimMsgId = _showAtMsgId;
highlightMessage(item);
}
} else if (initial && _showAtMsgId > 0) {
auto item = App::histItemById(_channel, _showAtMsgId);
@ -4854,12 +4917,7 @@ void HistoryWidget::updateListSize(bool initial, bool loadedDown, const ScrollCh
return updateListSize(initial, false, change);
} else {
toY = itemTopForHighlight(item);
_animActiveStart = getms();
_animActiveTimer.start(AnimationTimerDelta);
_activeAnimMsgId = _showAtMsgId;
if (item->isGroupMigrate() && _migrated && !_migrated->isEmpty() && _migrated->loadedAtBottom() && _migrated->blocks.back()->items.back()->isGroupMigrate() && _list->historyTop() != _list->historyDrawTop()) {
_activeAnimMsgId = -_migrated->blocks.back()->items.back()->id;
}
highlightMessage(item);
}
} else if (initial && (_history->unreadBar || (_migrated && _migrated->unreadBar))) {
toY = unreadBarTop();

2
Telegram/SourceFiles/historywidget.h
View File

@ -698,6 +698,8 @@ private:
setFieldText(TextWithTags(), events, undoHistoryAction);
}
void animatedScrollToItem(MsgId msgId);
void highlightMessage(HistoryItem *context);
void updateDragAreas();
// when scroll position or scroll area size changed this method