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Improve field fade conditions.

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This commit is contained in:
John Preston 2024-06-10 10:55:44 +04:00
parent c1f36d43d0
commit fa8ed186d8
1 changed files with 15 additions and 5 deletions
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20
Telegram/SourceFiles/chat_helpers/message_field.cpp
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@ -580,11 +580,21 @@ void InitMessageFieldFade(
}, topFade->lifetime());
const auto descent = field->st().style.font->descent;
topFade->show();
bottomFade->showOn(field->scrollTop().value(
) | rpl::map([field, descent](int scroll) {
return (scroll + descent) < field->scrollTopMax();
}) | rpl::distinct_until_changed());
rpl::merge(
field->changes(),
field->scrollTop().changes() | rpl::to_empty,
field->sizeValue() | rpl::to_empty
) | rpl::start_with_next([=] {
const auto topHidden = !field->scrollTop().current();
if (topFade->isHidden() != topHidden) {
topFade->setVisible(!topHidden);
}
const auto adjusted = field->scrollTop().current() + descent;
const auto bottomHidden = (adjusted >= field->scrollTopMax());
if (bottomFade->isHidden() != bottomHidden) {
bottomFade->setVisible(!bottomHidden);
}
}, topFade->lifetime());
}
InlineBotQuery ParseInlineBotQuery(