window: cursor position is now stored in window coordinate

It was stored in buffer coordinates. Conversion methods added

2 files changed, 53 insertions, 10 deletions

diff --git a/src/window.cc b/src/window.cc
index 4a889c00..09b7be7e 100644
--- a/src/window.cc
+++ b/src/window.cc
@@ -8,7 +8,8 @@ namespace Kakoune
 Window::Window(const std::shared_ptr<Buffer> buffer)
     : m_buffer(buffer),
       m_position(0, 0),
-      m_cursor(0, 0)
+      m_cursor(0, 0),
+      m_dimensions(0, 0)
 {
 }
 
@@ -16,7 +17,7 @@ void Window::erase()
 {
     if (m_selections.empty())
     {
-        BufferIterator cursor = m_buffer->iterator_at(m_cursor);
+        BufferIterator cursor = iterator_at(m_cursor);
         m_buffer->erase(cursor, cursor+1);
     }
 
@@ -47,7 +48,7 @@ void Window::insert(const String& string)
 {
     if (m_selections.empty())
     {
-        m_buffer->insert(m_buffer->iterator_at(m_cursor), string);
+        m_buffer->insert(iterator_at(m_cursor), string);
         move_cursor(measure_string(string));
     }
 
@@ -73,6 +74,28 @@ void Window::append(const String& string)
     }
 }
 
+LineAndColumn Window::window_to_buffer(const LineAndColumn& window_pos) const
+{
+    return LineAndColumn(m_position.line + window_pos.line,
+                         m_position.column + window_pos.column);
+}
+
+LineAndColumn Window::buffer_to_window(const LineAndColumn& buffer_pos) const
+{
+    return LineAndColumn(buffer_pos.line - m_position.line,
+                         buffer_pos.column - m_position.column);
+}
+
+BufferIterator Window::iterator_at(const LineAndColumn& window_pos) const
+{
+    return m_buffer->iterator_at(window_to_buffer(window_pos));
+}
+
+LineAndColumn Window::line_and_column_at(const BufferIterator& iterator) const
+{
+    return buffer_to_window(m_buffer->line_and_column_at(iterator));
+}
+
 void Window::empty_selections()
 {
     m_selections.clear();
@@ -83,7 +106,7 @@ void Window::select(bool append, const Selector& selector)
     if (not append or m_selections.empty())
     {
         empty_selections();
-        m_selections.push_back(selector(m_buffer->iterator_at(m_cursor)));
+        m_selections.push_back(selector(iterator_at(m_cursor)));
     }
     else
     {
@@ -92,13 +115,19 @@ void Window::select(bool append, const Selector& selector)
             sel->end = selector(sel->end).end;
         }
     }
-    m_cursor = m_buffer->line_and_column_at(m_selections.back().end);
+    m_cursor = line_and_column_at(m_selections.back().end);
+    scroll_to_keep_cursor_visible_ifn();
 }
 
 void Window::move_cursor(const LineAndColumn& offset)
 {
-    m_cursor = m_buffer->clamp(LineAndColumn(m_cursor.line + offset.line,
-                                             m_cursor.column + offset.column));
+    LineAndColumn target_position =
+        window_to_buffer(LineAndColumn(m_cursor.line + offset.line,
+                                       m_cursor.column + offset.column));
+
+    m_cursor = buffer_to_window(m_buffer->clamp(target_position));
+
+    scroll_to_keep_cursor_visible_ifn();
 }
 
 void Window::update_display_buffer()
@@ -109,7 +138,7 @@ void Window::update_display_buffer()
     std::sort(sorted_selections.begin(), sorted_selections.end(),
               [](const Selection& lhs, const Selection& rhs) { return lhs.begin < rhs.begin; });
 
-    BufferIterator current_position = m_buffer->begin();
+    BufferIterator current_position = m_buffer->iterator_at(m_position);
 
     for (Selection& sel : sorted_selections)
     {
@@ -136,4 +165,9 @@ void Window::update_display_buffer()
     }
 }
 
+void Window::set_dimensions(const LineAndColumn& dimensions)
+{
+    m_dimensions = dimensions;
+}
+
 }
diff --git a/src/window.hh b/src/window.hh
index 6df0cd70..6fe86cef 100644
--- a/src/window.hh
+++ b/src/window.hh
@@ -35,18 +35,27 @@ public:
 
     const LineAndColumn& position() const { return m_position; }
     const LineAndColumn& cursor_position() const { return m_cursor; }
+
     const std::shared_ptr<Buffer>& buffer() const { return m_buffer; }
+    LineAndColumn  window_to_buffer(const LineAndColumn& window_pos) const;
+    LineAndColumn  buffer_to_window(const LineAndColumn& buffer_pos) const;
+
+    BufferIterator iterator_at(const LineAndColumn& window_pos) const;
+    LineAndColumn  line_and_column_at(const BufferIterator& iterator) const;
 
     void move_cursor(const LineAndColumn& offset);
 
     const SelectionList& selections() const { return m_selections; }
 
-    void  empty_selections();
-    void  select(bool append, const Selector& selector);
+    void empty_selections();
+    void select(bool append, const Selector& selector);
+
+    void set_dimensions(const LineAndColumn& dimensions);
 
     const DisplayBuffer& display_buffer() const { return m_display_buffer; }
 
     void update_display_buffer();
+
 private:
 
     std::shared_ptr<Buffer> m_buffer;