136 lines
3.4 KiB
C
136 lines
3.4 KiB
C
#include <stdbool.h>
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#include "commands.h"
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#include "input.h"
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#include "kilo.h"
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#include "buffer.h"
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#include "utils.h"
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static void cursor_adjust_viewport(void);
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static void cursor_check_file_bounds(bool horizontal);
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static void cursor_update_rx(bool horizontal);
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void command_move_cursor(KEY key) {
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struct erow *rows = E.current_buf->rows;
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int n_rows = E.current_buf->n_rows;
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struct erow *current_row = (rows && E.cy < n_rows ? rows + E.cy : NULL);
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int max_x = (current_row ? current_row->n_chars : 0);
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switch (key) {
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case ARROW_LEFT:
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E.cx--;
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break;
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case ARROW_DOWN:
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E.cy++;
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break;
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case ARROW_UP:
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E.cy--;
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break;
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case ARROW_RIGHT:
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E.cx++;
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break;
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case HOME:
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E.cx = 0;
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break;
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case END:
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E.cx = max_x;
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break;
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case PG_UP:
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E.cy -= E.screenrows;
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break;
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case PG_DOWN:
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E.cy += E.screenrows;
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break;
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}
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bool horizontal = (key == ARROW_LEFT ||
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key == ARROW_RIGHT ||
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key == HOME ||
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key == END);
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cursor_check_file_bounds(horizontal);
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cursor_update_rx(horizontal);
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cursor_adjust_viewport();
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}
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void command_insert_char(char c) {
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if (E.cy == E.current_buf->n_rows)
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buffer_append_row(E.current_buf, NULL, 0);
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erow_insert_char(E.current_buf->rows+E.cy, E.cx++, c);
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E.rx = erow_cx_to_rx(E.current_buf->rows+E.cy, E.cx);
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}
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void command_save_buffer(void) {
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ERRCODE errcode = buffer_write_file(E.current_buf);
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if (errcode == 0)
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editor_set_message("Saved file %s", E.current_buf->filename);
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else if (errcode == -1)
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editor_set_message("Save failed, no filename");
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}
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static void cursor_check_file_bounds(bool horizontal) {
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struct erow *rows = E.current_buf->rows;
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int n_rows = E.current_buf->n_rows;
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struct erow *current_row = (rows && E.cy < n_rows ? rows + E.cy : NULL);
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int max_x = (current_row ? current_row->n_chars : 0);
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if (E.cy < 0)
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E.cy = 0;
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if (E.cy > n_rows)
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E.cy = n_rows;
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if (E.cx < 0) {
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if (E.cy > 0 && horizontal) E.cx = rows[--E.cy].n_chars;
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else E.cx = 0;
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}
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if (E.cx > max_x) {
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if (E.cy < n_rows && horizontal) {
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E.cx = 0;
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E.cy++;
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} else E.cx = max_x;
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}
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}
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static void cursor_update_rx(bool horizontal) {
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struct erow *rows = E.current_buf->rows;
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int n_rows = E.current_buf->n_rows;
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struct erow *current_row = (rows && E.cy < n_rows ? rows + E.cy : NULL);
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int max_x = (current_row ? current_row->n_chars : 0);
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static int saved_rx = 0;
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if (horizontal) saved_rx = erow_cx_to_rx(current_row, E.cx);
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else {
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E.cx = erow_rx_to_cx(current_row, saved_rx);
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if (E.cx > max_x)
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E.cx = max_x;
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}
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E.rx = erow_cx_to_rx(rows + E.cy, E.cx);
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}
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static void cursor_adjust_viewport(void) {
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int max_row_off = E.cy;
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if (E.row_off > max_row_off)
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E.row_off = max_row_off;
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int max_col_off = E.rx;
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if (E.col_off > max_col_off)
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E.col_off = max_col_off;
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int min_row_off = E.cy - (E.screenrows - 1);
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if (E.row_off < min_row_off)
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E.row_off = min_row_off;
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int min_col_off = E.rx - (E.screencols - 1);
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if (E.col_off < min_col_off)
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E.col_off = min_col_off;
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}
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