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LibLine: Properly handle window resize by not spamming DSRs

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We have all the information necessary to find our new origin when a
window size change occurs.
This commit is contained in:
AnotherTest 2020-04-11 14:06:46 +04:30 • committed by Andreas Kling
parent 173c65660a
commit f946d6ce79
2 changed files with 18 additions and 1 deletions
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18
Libraries/LibLine/Editor.cpp
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@ -407,6 +407,22 @@ String Editor::get_line(const String& prompt)
}
}
void Editor::recalculate_origin()
{
// changing the columns can affect our origin if
// the new size is smaller than our prompt, which would
// cause said prompt to take up more space, so we should
// compensate for that
if (m_cached_prompt_length >= m_num_columns) {
auto added_lines = (m_cached_prompt_length + 1) / m_num_columns - 1;
dbg() << "added lines: " << added_lines;
m_origin_x += added_lines;
}
// we also need to recalculate our cursor position
// but that will be calculated and applied at the next
// refresh cycle
}
void Editor::refresh_display()
{
auto cleanup = [&] {
@ -436,8 +452,8 @@ void Editor::refresh_display()
m_cached_prompt_valid = false;
m_refresh_needed = true;
swap(previous_num_columns, m_num_columns);
recalculate_origin();
cleanup();
set_origin();
swap(previous_num_columns, m_num_columns);
has_cleaned_up = true;
}