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Try to keep the selection start visible if possible

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This commit is contained in:
Maxime Coste 2013-07-24 01:34:00 +02:00
parent c7e52a650d
commit 8633a37dad
2 changed files with 35 additions and 40 deletions
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2
src/display_buffer.hh
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@ -122,11 +122,11 @@ struct DisplayAtom
};
using BufferRange = std::pair<BufferCoord, BufferCoord>;
using AtomList = std::vector<DisplayAtom>;
class DisplayLine
{
public:
using AtomList = std::vector<DisplayAtom>;
using iterator = AtomList::iterator;
using const_iterator = AtomList::const_iterator;

73
src/window.cc
View File

@ -69,8 +69,7 @@ void Window::update_display_buffer()
LineCount buffer_line = m_position.line + line;
if (buffer_line >= buffer().line_count())
break;
lines.emplace_back();
lines.back().push_back(DisplayAtom(AtomContent(buffer(), buffer_line, buffer_line+1)));
lines.emplace_back(AtomList{ {AtomContent(buffer(), buffer_line, buffer_line+1)} });
}
m_display_buffer.compute_range();
@ -108,6 +107,31 @@ static LineCount adapt_view_pos(LineCount line, LineCount offset,
return view_pos;
}
static CharCount adapt_view_pos(const DisplayLine& line, BufferCoord pos, CharCount view_pos, CharCount view_size)
{
CharCount buffer_column = 0;
CharCount non_buffer_column = 0;
for (auto& atom : line)
{
if (atom.content.has_buffer_range())
{
if (atom.content.begin() <= pos and atom.content.end() > pos)
{
if (buffer_column < view_pos)
return buffer_column;
auto last_column = buffer_column + atom.content.length();
if (last_column >= view_pos + view_size - non_buffer_column)
return last_column - view_size + non_buffer_column;
}
buffer_column += atom.content.length();
}
else
non_buffer_column += atom.content.length();
}
return view_pos;
}
void Window::scroll_to_keep_cursor_visible_ifn()
{
const auto& first = main_selection().first();
@ -125,9 +149,7 @@ void Window::scroll_to_keep_cursor_visible_ifn()
// highlight only the line containing the cursor
DisplayBuffer display_buffer;
DisplayBuffer::LineList& lines = display_buffer.lines();
lines.emplace_back();
lines.back().push_back(DisplayAtom(AtomContent(buffer(), last.line, last.line+1)));
lines.emplace_back(AtomList{ AtomContent(buffer(), last.line, last.line+1) });
display_buffer.compute_range();
m_highlighters(*this, display_buffer);
@ -137,34 +159,11 @@ void Window::scroll_to_keep_cursor_visible_ifn()
// (this is only valid if highlighting one line and multiple lines put
// the cursor in the same position, however I do not find any sane example
// of highlighters not doing that)
auto cursor = buffer().iterator_at(last);
CharCount buffer_column = 0;
CharCount non_buffer_column = 0;
for (auto& atom : lines.back())
{
if (atom.content.has_buffer_range())
{
if (atom.content.begin() <= last and atom.content.end() > last)
{
if (buffer_column < m_position.column)
m_position.column = buffer_column;
auto last_column = buffer_column + atom.content.length();
if (last_column >= m_position.column + m_dimensions.column - non_buffer_column)
m_position.column = last_column - m_dimensions.column + non_buffer_column;
return;
}
buffer_column += atom.content.length();
}
else
non_buffer_column += atom.content.length();
}
if (not buffer().is_end(last))
{
// the cursor should always be visible.
kak_assert(false);
}
m_position.column = adapt_view_pos(lines.back(),
first.line == last.line ? first : last.line,
m_position.column, m_dimensions.column);
m_position.column = adapt_view_pos(lines.back(), last,
m_position.column, m_dimensions.column);
}
namespace
@ -228,12 +227,8 @@ BufferCoord Window::offset_coord(const BufferCoord& coord, LineCount offset)
auto line = clamp(coord.line + offset, 0_line, buffer().line_count()-1);
DisplayBuffer display_buffer;
DisplayBuffer::LineList& lines = display_buffer.lines();
{
lines.emplace_back();
lines.back().push_back({AtomContent(buffer(), coord.line, coord.line+1)});
lines.emplace_back();
lines.back().push_back({AtomContent(buffer(), line, line+1)});
}
lines.emplace_back(AtomList{ {AtomContent(buffer(), coord.line, coord.line+1)} });
lines.emplace_back(AtomList{ {AtomContent(buffer(), line, line+1)} });
display_buffer.compute_range();
m_highlighters(*this, display_buffer);
m_builtin_highlighters(*this, display_buffer);