325 lines
9.6 KiB
C++
325 lines
9.6 KiB
C++
#include "BufferPane.h"
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BufferPane::BufferPane(Window * window, std::shared_ptr<Buffer> buffer)
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: m_window(window), m_buffer(buffer)
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{
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m_cursor_screen_row = 0;
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m_scroll_offset = 5;
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m_iterator = buffer->add_iterator();
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}
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void BufferPane::resize(int width, int height)
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{
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Pane::resize(width, height);
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m_columns = std::max(1, m_width / m_window->font()->get_advance());
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m_rows = std::max(1, m_height / m_window->font()->get_line_height());
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}
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void BufferPane::walk_line(const Buffer::Iterator & start_of_line, std::function<void(int, int, int, int, const Buffer::Iterator &)> callback)
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{
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int row_offset = 0;
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int screen_column = 0;
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int virtual_column = 0;
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Buffer::Iterator i = start_of_line;
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for (;;)
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{
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uint32_t code_point = *i;
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if ((code_point == '\n') || (!i.valid()))
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{
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callback(row_offset, screen_column, virtual_column, 0, i);
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break;
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}
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int c_width;
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if (code_point == '\t')
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{
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uint8_t tabstop = m_buffer->tabstop();
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c_width = tabstop - screen_column % tabstop;
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}
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else
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{
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c_width = character_width(code_point);
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}
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if (((screen_column + c_width) > m_columns) &&
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(screen_column > 0))
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{
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row_offset++;
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screen_column = 0;
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}
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callback(row_offset, screen_column, virtual_column, c_width, i);
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virtual_column += c_width;
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if (code_point == '\t')
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{
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screen_column += c_width;
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while (screen_column >= m_columns)
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{
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screen_column -= m_columns;
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row_offset++;
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}
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}
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else
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{
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if ((screen_column + c_width) >= m_columns)
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{
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row_offset++;
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screen_column = 0;
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}
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else
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{
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screen_column += c_width;
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}
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}
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i.go_forward();
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}
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}
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int BufferPane::rows_in_line(const Buffer::Iterator & start_of_line)
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{
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int saved_row_offset = 0;
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walk_line(start_of_line, [&saved_row_offset](int row_offset, int screen_column, int virtual_column, int character_width, const Buffer::Iterator & i) {
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uint32_t code_point = *i;
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if ((code_point != '\n') && (code_point != 0xFFFFFFFFu))
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{
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saved_row_offset = row_offset;
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}
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});
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return saved_row_offset + 1;
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}
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int BufferPane::rows_in_line_with_iterator_offset(const Buffer::Iterator & start_of_line, const Buffer::Iterator & reference, int * iterator_row_offset)
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{
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int saved_row_offset = 0;
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walk_line(start_of_line, [&saved_row_offset, &reference, &iterator_row_offset](int row_offset, int screen_column, int virtual_column, int character_width, const Buffer::Iterator & i) {
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uint32_t code_point = *i;
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if (i == reference)
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{
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*iterator_row_offset = row_offset;
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}
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if ((code_point != '\n') && (code_point != 0xFFFFFFFFu))
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{
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saved_row_offset = row_offset;
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}
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});
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return saved_row_offset + 1;
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}
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int BufferPane::screen_rows_below_line(const Buffer::Iterator & line)
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{
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Buffer::Iterator i = line;
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int rows = 0;
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while ((rows < m_rows) && i.go_next_line())
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{
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rows += rows_in_line(i);
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}
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return rows;
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}
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int BufferPane::screen_rows_above_line(const Buffer::Iterator & line, std::list<std::pair<int, Buffer::Iterator>> & backward_lines)
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{
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Buffer::Iterator i = line;
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int rows = 0;
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while ((rows < m_rows) && i.go_previous_line())
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{
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int rows_in_this_line = rows_in_line(i);
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rows += rows_in_this_line;
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backward_lines.push_back(std::pair<int, Buffer::Iterator>(rows_in_this_line, i));
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}
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return rows;
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}
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int BufferPane::update_cursor_row(std::list<std::pair<int, Buffer::Iterator>> & backward_lines)
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{
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Buffer::Iterator start_of_line = *m_iterator;
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start_of_line.go_start_of_line();
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int cursor_row_offset;
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int rows_in_cursor_line = rows_in_line_with_iterator_offset(start_of_line, *m_iterator, &cursor_row_offset);
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int so = effective_scroll_offset();
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int rows_above = screen_rows_above_line(*m_iterator, backward_lines) + cursor_row_offset;
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int rows_below = screen_rows_below_line(*m_iterator) + std::max(0, rows_in_cursor_line - cursor_row_offset - 1);
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int min_rows_to_leave_above = std::min(rows_above, so);
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int min_rows_to_leave_below = std::min(rows_below, so);
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m_cursor_screen_row = std::min(m_rows - min_rows_to_leave_below - 1, m_cursor_screen_row);
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m_cursor_screen_row = std::max(min_rows_to_leave_above, m_cursor_screen_row);
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m_cursor_screen_row = std::max(m_rows - rows_below - 1, m_cursor_screen_row);
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m_cursor_screen_row = std::min(rows_above, m_cursor_screen_row);
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return cursor_row_offset;
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}
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void BufferPane::draw()
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{
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if (m_iterator->valid())
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{
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std::list<std::pair<int, Buffer::Iterator>> backward_lines;
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int cursor_row_offset_in_current_line = update_cursor_row(backward_lines);
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int screen_row = m_cursor_screen_row - cursor_row_offset_in_current_line;
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Buffer::Iterator i = *m_iterator;
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if (screen_row <= 0)
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{
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i.go_start_of_line();
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}
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else for (auto rows_iterator_pair : backward_lines)
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{
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screen_row -= rows_iterator_pair.first;
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i = rows_iterator_pair.second;
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if (screen_row <= 0)
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{
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break;
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}
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}
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while (screen_row <= m_rows)
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{
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screen_row += draw_buffer_line(screen_row, i);
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if (!i.go_next_line())
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{
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break;
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}
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}
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}
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else
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{
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draw_cursor(col_x(0), row_y(0), false);
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}
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}
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int BufferPane::draw_buffer_line(int screen_row, const Buffer::Iterator & start_of_line)
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{
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int saved_row_offset = 0;
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walk_line(start_of_line, [this, &saved_row_offset, &screen_row](int row_offset, int screen_column, int virtual_column, int character_width, const Buffer::Iterator & i) {
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uint32_t code_point = *i;
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int draw_row = screen_row + row_offset;
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int x = col_x(screen_column);
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int y = row_y(draw_row);
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if ((draw_row >= 0) && (draw_row <= m_rows))
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{
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if (i == *m_iterator)
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{
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/* TODO: highlight multi-column characters */
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draw_cursor(x, y, false);
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}
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if ((code_point == '\n') || (code_point == 0xFFFFFFFFu))
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{
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}
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else
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{
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saved_row_offset = row_offset;
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if ((code_point != '\t') && (code_point != ' '))
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{
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m_window->gl()->draw_character(win_x(x), win_y(y), code_point, *m_window->font());
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}
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}
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}
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});
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return saved_row_offset + 1;
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}
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int BufferPane::character_width(uint32_t character)
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{
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if (character < 0x20u)
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{
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return 2;
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}
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else if (character < 0x80u)
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{
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return 1u;
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}
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else
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{
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return std::max(1, m_window->font()->get_glyph(character)->get_advance() / m_window->font()->get_advance());
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}
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}
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void BufferPane::draw_buffer_character(int screen_column, int screen_row, uint32_t character)
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{
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if (character < 0x20u)
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{
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m_window->gl()->draw_character(win_x(col_x(screen_column)), win_y(row_y(screen_row)),
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'^', *m_window->font());
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m_window->gl()->draw_character(win_x(col_x(screen_column + 1)), win_y(row_y(screen_row)),
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(character - 0x20u + 'A'), *m_window->font());
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}
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else
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{
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m_window->gl()->draw_character(win_x(col_x(screen_column)), win_y(row_y(screen_row)),
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character, *m_window->font());
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}
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}
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void BufferPane::draw_cursor(int x, int y, bool insert_mode)
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{
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int width = insert_mode ? 1 : m_window->font()->get_advance();
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int height = m_window->font()->get_line_height();
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m_window->gl()->draw_rect(win_x(x), win_y(y), width, height, 1.0, 0.2, 1.0, 1.0);
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}
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void BufferPane::handle_key(uint32_t keyval)
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{
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#if 0
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if (m_buffer->piece_table->in_insert_mode())
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{
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if (keyval == '\033')
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{
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m_buffer->piece_table->end_insert();
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}
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else if (keyval <= 0xFFu)
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{
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m_buffer->piece_table->insert_code_point(keyval);
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}
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redraw();
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}
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else
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#endif
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{
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switch (keyval)
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{
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case '0':
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cursor_move(CursorMovement::SOL);
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break;
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case '$':
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cursor_move(CursorMovement::EOL);
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break;
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case 'h':
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cursor_move(CursorMovement::LEFT);
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break;
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case 'j':
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cursor_move(CursorMovement::DOWN);
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break;
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case 'k':
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cursor_move(CursorMovement::UP);
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break;
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case 'l':
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cursor_move(CursorMovement::RIGHT);
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break;
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}
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}
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}
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void BufferPane::cursor_move(CursorMovement which)
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{
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bool moved = false;
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switch (which)
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{
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case CursorMovement::LEFT:
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moved = m_iterator->go_left_in_line();
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break;
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case CursorMovement::RIGHT:
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moved = m_iterator->go_right_in_line(false);
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break;
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case CursorMovement::UP:
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moved = m_iterator->go_previous_line();
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break;
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case CursorMovement::DOWN:
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moved = m_iterator->go_next_line();
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break;
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case CursorMovement::SOL:
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moved = m_iterator->go_start_of_line();
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break;
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case CursorMovement::EOL:
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moved = m_iterator->go_end_of_line(false);
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break;
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}
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if (moved)
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{
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m_window->request_redraw();
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}
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}
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