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Window: cursors are now implicit, taken from current selections

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Window hence guarantees that there is always at least one selection.
This commit is contained in:
Maxime Coste 2011-09-27 18:45:22 +00:00
parent 610acb3c0e
commit 309b722df9
3 changed files with 76 additions and 90 deletions
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2
src/main.cc
View File

@ -228,7 +228,7 @@ void do_insert(Window& window, bool append = false)
draw_window(window);
while(true)
{
const WindowCoord& pos = inserter.cursors().back();
const WindowCoord& pos = window.cursor_position();
move(pos.line, pos.column);
char c = getch();

135
src/window.cc
View File

@ -36,28 +36,37 @@ private:
Window::Window(Buffer& buffer)
: m_buffer(buffer),
m_position(0, 0),
m_cursor(0, 0),
m_dimensions(0, 0),
m_current_inserter(nullptr)
{
m_selections.push_back(Selection(buffer.begin(), buffer.begin()));
}
void Window::check_invariant() const
{
assert(not m_selections.empty());
}
WindowCoord Window::cursor_position() const
{
check_invariant();
return line_and_column_at(m_selections.back().last());
}
void Window::erase()
{
scoped_undo_group undo_group(m_buffer);
if (m_selections.empty())
{
BufferIterator cursor = iterator_at(m_cursor);
m_buffer.erase(cursor, cursor+1);
}
erase_noundo();
}
void Window::erase_noundo()
{
check_invariant();
for (auto& sel : m_selections)
{
m_buffer.erase(sel.begin(), sel.end());
sel = Selection(sel.begin(), sel.begin());
}
if (not m_selections.empty())
m_cursor = line_and_column_at(m_selections.back().last());
}
static WindowCoord measure_string(const Window::String& string)
@ -79,13 +88,11 @@ static WindowCoord measure_string(const Window::String& string)
void Window::insert(const String& string)
{
scoped_undo_group undo_group(m_buffer);
insert_noundo(string);
}
if (m_selections.empty())
{
m_buffer.insert(iterator_at(m_cursor), string);
move_cursor(measure_string(string));
}
void Window::insert_noundo(const String& string)
{
for (auto& sel : m_selections)
{
m_buffer.insert(sel.begin(), string);
@ -95,19 +102,14 @@ void Window::insert(const String& string)
void Window::append(const String& string)
{
if (m_selections.empty())
{
move_cursor(WindowCoord(0 , 1));
insert(string);
}
else
{
scoped_undo_group undo_group(m_buffer);
append_noundo(string);
}
void Window::append_noundo(const String& string)
{
for (auto& sel : m_selections)
{
m_buffer.insert(sel.end(), string);
}
}
}
bool Window::undo()
@ -144,15 +146,22 @@ WindowCoord Window::line_and_column_at(const BufferIterator& iterator) const
void Window::empty_selections()
{
check_invariant();
Selection sel = Selection(m_selections.back().last(),
m_selections.back().last());
m_selections.clear();
m_selections.push_back(std::move(sel));
}
void Window::select(bool append, const Selector& selector)
{
if (not append or m_selections.empty())
check_invariant();
if (not append)
{
empty_selections();
m_selections.push_back(selector(iterator_at(m_cursor)));
Selection sel = selector(m_selections.back().last());
m_selections.clear();
m_selections.push_back(std::move(sel));
}
else
{
@ -161,32 +170,27 @@ void Window::select(bool append, const Selector& selector)
sel = Selection(sel.first(), selector(sel.last()).last());
}
}
m_cursor = line_and_column_at(m_selections.back().last());
scroll_to_keep_cursor_visible_ifn();
}
BufferString Window::selection_content() const
{
if (m_selections.empty())
{
BufferIterator it = iterator_at(m_cursor);
return m_buffer.string(it, it+1);
}
else
check_invariant();
return m_buffer.string(m_selections.back().begin(),
m_selections.back().end());
}
void Window::move_cursor(const WindowCoord& offset)
{
move_cursor_to(m_cursor + offset);
move_cursor_to(cursor_position() + offset);
}
void Window::move_cursor_to(const WindowCoord& new_pos)
{
BufferCoord target_position = window_to_buffer(new_pos);
m_cursor = buffer_to_window(m_buffer.clamp(target_position));
BufferIterator target = iterator_at(new_pos);
m_selections.clear();
m_selections.push_back(Selection(target, target));
scroll_to_keep_cursor_visible_ifn();
}
@ -234,26 +238,25 @@ void Window::set_dimensions(const WindowCoord& dimensions)
void Window::scroll_to_keep_cursor_visible_ifn()
{
if (m_cursor.line < 0)
check_invariant();
WindowCoord cursor = line_and_column_at(m_selections.back().last());
if (cursor.line < 0)
{
m_position.line = std::max(m_position.line + m_cursor.line, 0);
m_cursor.line = 0;
m_position.line = std::max(m_position.line + cursor.line, 0);
}
else if (m_cursor.line >= m_dimensions.line)
else if (cursor.line >= m_dimensions.line)
{
m_position.line += m_cursor.line - (m_dimensions.line - 1);
m_cursor.line = m_dimensions.line - 1;
m_position.line += cursor.line - (m_dimensions.line - 1);
}
if (m_cursor.column < 0)
if (cursor.column < 0)
{
m_position.column = std::max(m_position.column + m_cursor.column, 0);
m_cursor.column = 0;
m_position.column = std::max(m_position.column + cursor.column, 0);
}
else if (m_cursor.column >= m_dimensions.column)
else if (cursor.column >= m_dimensions.column)
{
m_position.column += m_cursor.column - (m_dimensions.column - 1);
m_cursor.column = m_dimensions.column - 1;
m_position.column += cursor.column - (m_dimensions.column - 1);
}
}
@ -262,21 +265,12 @@ IncrementalInserter::IncrementalInserter(Window& window, bool append)
{
assert(not m_window.m_current_inserter);
m_window.m_current_inserter = this;
m_window.check_invariant();
if (m_window.m_selections.empty())
{
WindowCoord pos = m_window.m_cursor;
if (append)
pos += WindowCoord(0, 1);
m_cursors.push_back(pos);
}
else
{
for (auto& sel : m_window.m_selections)
{
const BufferIterator& pos = append ? sel.end() : sel.begin();
m_cursors.push_back(m_window.line_and_column_at(pos));
}
sel = Selection(pos, pos);
}
m_window.m_buffer.begin_undo_group();
}
@ -291,29 +285,22 @@ IncrementalInserter::~IncrementalInserter()
void IncrementalInserter::insert(const Window::String& string)
{
for (auto& cursor : m_cursors)
{
m_window.m_buffer.insert(m_window.iterator_at(cursor), string);
move_cursor(measure_string(string));
}
m_window.insert_noundo(string);
}
void IncrementalInserter::erase()
{
for (auto& cursor : m_cursors)
{
BufferIterator pos = m_window.iterator_at(cursor);
m_window.m_buffer.erase(pos - 1, pos);
move_cursor(WindowCoord(0, -1));
}
m_window.erase_noundo();
}
void IncrementalInserter::move_cursor(const WindowCoord& offset)
{
for (auto& cursor : m_cursors)
for (auto& sel : m_window.m_selections)
{
BufferCoord target = m_window.window_to_buffer(cursor + offset);
cursor = m_window.buffer_to_window(m_window.m_buffer.clamp(target));
WindowCoord pos = m_window.line_and_column_at(sel.last());
BufferIterator it = m_window.iterator_at(pos + offset);
sel = Selection(it, it);
}
}

13
src/window.hh
View File

@ -50,7 +50,7 @@ public:
void append(const String& string);
const BufferCoord& position() const { return m_position; }
const WindowCoord& cursor_position() const { return m_cursor; }
WindowCoord cursor_position() const;
Buffer& buffer() const { return m_buffer; }
@ -82,14 +82,18 @@ private:
Window(Buffer& buffer);
Window(const Window&) = delete;
void check_invariant() const;
void scroll_to_keep_cursor_visible_ifn();
void erase_noundo();
void insert_noundo(const String& string);
void append_noundo(const String& string);
friend class IncrementalInserter;
IncrementalInserter* m_current_inserter;
Buffer& m_buffer;
BufferCoord m_position;
WindowCoord m_cursor;
WindowCoord m_dimensions;
SelectionList m_selections;
DisplayBuffer m_display_buffer;
@ -98,8 +102,6 @@ private:
class IncrementalInserter
{
public:
typedef std::vector<WindowCoord> CursorList;
IncrementalInserter(Window& window, bool append = false);
~IncrementalInserter();
@ -107,11 +109,8 @@ public:
void erase();
void move_cursor(const WindowCoord& offset);
const CursorList& cursors() const { return m_cursors; }
private:
Window& m_window;
std::vector<WindowCoord> m_cursors;
};
}