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Highlight text in bottom of a long bubble.

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This commit is contained in:
John Preston 2024-12-09 14:59:59 +04:00
parent 3565215c81
commit 4701badb2a
1 changed files with 43 additions and 0 deletions
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43
Telegram/SourceFiles/history/history_widget.cpp
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@ -1433,6 +1433,49 @@ int HistoryWidget::itemTopForHighlight(
const auto heightLeft = (visibleAreaHeight - viewHeight); const auto heightLeft = (visibleAreaHeight - viewHeight);
if (heightLeft >= 0) { if (heightLeft >= 0) {
return std::max(itemTop - (heightLeft / 2), 0); return std::max(itemTop - (heightLeft / 2), 0);
} else if (const auto sel = itemHighlight(item).range; !sel.empty()) {
auto request = HistoryView::StateRequest();
request.flags = Ui::Text::StateRequest::Flag::LookupSymbol;
const auto single = st::messageTextStyle.font->height;
const auto findy = [&](int symbol, int yfrom = 0) {
const auto fory = [&](int y) {
return view->textState(QPoint(0, y), request).symbol;
};
auto ytill = view->height() - 1;
auto symbolfrom = fory(yfrom);
auto symboltill = fory(ytill);
if ((yfrom >= ytill) || (symbolfrom >= symbol)) {
return yfrom;
} else if (symboltill <= symbol) {
return ytill;
}
while (ytill - yfrom >= 2 * single) {
const auto middle = (yfrom + ytill) / 2;
const auto found = fory(middle);
if (found == symbol
|| symbolfrom > found
|| symboltill < found) {
return middle;
} else if (found < symbol) {
yfrom = middle;
symbolfrom = found;
} else {
ytill = middle;
symboltill = found;
}
}
return (yfrom + ytill) / 2;
};
const auto begin = findy(sel.from) - single;
const auto end = findy(sel.to, begin + single) + 2 * single;
auto result = itemTop;
if (end > visibleAreaHeight) {
result = std::max(result, itemTop + end - visibleAreaHeight);
}
if (itemTop + begin < result) {
result = itemTop + begin;
}
return result;
} else if (reactionCenter >= 0) { } else if (reactionCenter >= 0) {
const auto maxSize = st::reactionInlineImage; const auto maxSize = st::reactionInlineImage;