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LibVT+Terminal: Implement line wrapping

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This commit implements line wrapping in the terminal, and tries its best
to move the cursor to the "correct" position.
This commit is contained in:
Ali Mohammad Pur 2021-06-19 03:53:03 +04:30 • committed by Andreas Kling
parent 424965954f
commit 2f2b7814d1
5 changed files with 206 additions and 22 deletions
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18
Userland/Libraries/LibVT/Line.h
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@ -10,6 +10,7 @@
#include <AK/String.h>
#include <AK/Vector.h>
#include <LibVT/Attribute.h>
#include <LibVT/Position.h>
#include <LibVT/XtermColors.h>
namespace VT {
@ -25,6 +26,8 @@ public:
struct Cell {
u32 code_point { ' ' };
Attribute attribute;
bool operator!=(Cell const& other) const { return code_point != other.code_point || attribute != other.attribute; }
};
const Attribute& attribute_at(size_t index) const { return m_cells[index].attribute; }
@ -41,8 +44,16 @@ public:
void clear_range(size_t first_column, size_t last_column, const Attribute& attribute = Attribute());
bool has_only_one_background_color() const;
size_t length() const { return m_cells.size(); }
void set_length(size_t);
bool is_empty() const
{
return !any_of(m_cells.begin(), m_cells.end(), [](auto& cell) { return cell != Cell(); });
}
size_t length() const
{
return m_cells.size();
}
void set_length(size_t, Line* next_line, CursorPosition* cursor, bool cursor_is_on_next_line = true);
u32 code_point(size_t index) const
{
@ -67,6 +78,9 @@ public:
void set_terminated(u16 column) { m_terminated_at = column; }
private:
void take_cells_from_next_line(size_t old_length, size_t new_length, Line* next_line, bool cursor_is_on_next_line, CursorPosition* cursor);
void push_cells_into_next_line(size_t old_length, size_t new_length, Line* next_line, bool cursor_is_on_next_line, CursorPosition* cursor);
Vector<Cell> m_cells;
bool m_dirty { false };
// Note: The alignment is 8, so this member lives in the padding (that already existed before it was introduced)