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Window: try to show as much of the selection as possible

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This commit is contained in:
Maxime Coste 2013-02-12 19:01:25 +01:00
parent cb26948ad3
commit 4eea0a4ce1
1 changed files with 27 additions and 16 deletions
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43
src/window.cc
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@ -82,21 +82,27 @@ void Window::set_dimensions(const DisplayCoord& dimensions)
void Window::scroll_to_keep_cursor_visible_ifn() void Window::scroll_to_keep_cursor_visible_ifn()
{ {
const BufferIterator cursor = selections().back().last(); const BufferIterator first = selections().back().first();
const BufferIterator last = selections().back().last();
// scroll lines if needed // scroll lines if needed
if (cursor.line() < m_position.line) if (first.line() < m_position.line)
m_position.line = cursor.line(); m_position.line = first.line();
else if (cursor.line() >= m_position.line + m_dimensions.line) else if (first.line() >= m_position.line + m_dimensions.line)
m_position.line = cursor.line() - (m_dimensions.line - 1); m_position.line = first.line() - (m_dimensions.line - 1);
if (last.line() < m_position.line)
m_position.line = last.line();
else if (last.line() >= m_position.line + m_dimensions.line)
m_position.line = last.line() - (m_dimensions.line - 1);
// highlight only the line containing the cursor // highlight only the line containing the cursor
DisplayBuffer display_buffer; DisplayBuffer display_buffer;
DisplayBuffer::LineList& lines = display_buffer.lines(); DisplayBuffer::LineList& lines = display_buffer.lines();
lines.push_back(DisplayLine(cursor.line())); lines.push_back(DisplayLine(last.line()));
BufferIterator line_begin = buffer().iterator_at_line_begin(cursor); BufferIterator line_begin = buffer().iterator_at_line_begin(last);
BufferIterator line_end = buffer().iterator_at_line_end(cursor); BufferIterator line_end = buffer().iterator_at_line_end(last);
lines.back().push_back(DisplayAtom(AtomContent(line_begin, line_end))); lines.back().push_back(DisplayAtom(AtomContent(line_begin, line_end)));
display_buffer.compute_range(); display_buffer.compute_range();
@ -110,18 +116,23 @@ void Window::scroll_to_keep_cursor_visible_ifn()
for (auto& atom : lines.back()) for (auto& atom : lines.back())
{ {
if (atom.content.has_buffer_range() and if (atom.content.has_buffer_range() and
atom.content.begin() <= cursor and atom.content.end() > cursor) atom.content.begin() <= last and atom.content.end() > last)
{ {
if (atom.content.type() == AtomContent::BufferRange) if (atom.content.type() == AtomContent::BufferRange)
column += utf8::distance(atom.content.begin(), cursor); column += utf8::distance(atom.content.begin(), last);
else else
column += atom.content.content().char_length(); column += atom.content.content().char_length();
CharCount cursor_col = utf8::distance(line_begin, cursor); CharCount first_col = first.line() == last.line() ?
// we could early out on this, but having scrolling left utf8::distance(line_begin, first) : 0_char;
// faster than not scrolling at all is not really useful. if (first_col < m_position.column)
if (cursor_col < m_position.column) m_position.column = first_col;
m_position.column = cursor_col; else if (column >= m_position.column + m_dimensions.column)
m_position.column = column - (m_dimensions.column - 1);
CharCount last_col = utf8::distance(line_begin, last);
if (last_col < m_position.column)
m_position.column = last_col;
else if (column >= m_position.column + m_dimensions.column) else if (column >= m_position.column + m_dimensions.column)
m_position.column = column - (m_dimensions.column - 1); m_position.column = column - (m_dimensions.column - 1);
@ -129,7 +140,7 @@ void Window::scroll_to_keep_cursor_visible_ifn()
} }
column += atom.content.content().char_length(); column += atom.content.content().char_length();
} }
if (cursor != buffer().end()) if (last != buffer().end())
{ {
// the cursor should always be visible. // the cursor should always be visible.
assert(false); assert(false);