diff options
Diffstat (limited to 'examples/dte/view.c')
| -rw-r--r-- | examples/dte/view.c | 178 |
1 files changed, 0 insertions, 178 deletions
diff --git a/examples/dte/view.c b/examples/dte/view.c deleted file mode 100644 index cc259c0..0000000 --- a/examples/dte/view.c +++ /dev/null @@ -1,178 +0,0 @@ -#include "view.h" -#include "buffer.h" -#include "indent.h" -#include "util/ascii.h" -#include "util/debug.h" -#include "util/str-util.h" -#include "util/utf8.h" -#include "window.h" - -void view_update_cursor_y(View *view) -{ - Buffer *buffer = view->buffer; - Block *blk; - size_t nl = 0; - block_for_each(blk, &buffer->blocks) { - if (blk == view->cursor.blk) { - nl += count_nl(blk->data, view->cursor.offset); - view->cy = nl; - return; - } - nl += blk->nl; - } - BUG("unreachable"); -} - -void view_update_cursor_x(View *view) -{ - StringView line; - const unsigned int tw = view->buffer->options.tab_width; - const size_t cx = fetch_this_line(&view->cursor, &line); - long cx_char = 0; - long w = 0; - - for (size_t idx = 0; idx < cx; cx_char++) { - CodePoint u = line.data[idx++]; - if (likely(u < 0x80)) { - if (likely(!ascii_iscntrl(u))) { - w++; - } else if (u == '\t') { - w = next_indent_width(w, tw); - } else { - w += 2; - } - } else { - idx--; - u = u_get_nonascii(line.data, line.length, &idx); - w += u_char_width(u); - } - } - - view->cx = cx; - view->cx_char = cx_char; - view->cx_display = w; -} - -static bool view_is_cursor_visible(const View *v) -{ - return v->cy < v->vy || v->cy > v->vy + v->window->edit_h - 1; -} - -static void view_center_to_cursor(View *v) -{ - size_t lines = v->buffer->nl; - Window *window = v->window; - unsigned int hh = window->edit_h / 2; - - if (window->edit_h >= lines || v->cy < hh) { - v->vy = 0; - return; - } - - v->vy = v->cy - hh; - if (v->vy + window->edit_h > lines) { - // -1 makes one ~ line visible so that you know where the EOF is - v->vy -= v->vy + window->edit_h - lines - 1; - } -} - -static void view_update_vx(View *v) -{ - Window *window = v->window; - unsigned int c = 8; - - if (v->cx_display - v->vx >= window->edit_w) { - v->vx = (v->cx_display - window->edit_w + c) / c * c; - } - if (v->cx_display < v->vx) { - v->vx = v->cx_display / c * c; - } -} - -static void view_update_vy(View *v, unsigned int scroll_margin) -{ - Window *window = v->window; - int margin = window_get_scroll_margin(window, scroll_margin); - long max_y = v->vy + window->edit_h - 1 - margin; - - if (v->cy < v->vy + margin) { - v->vy = MAX(v->cy - margin, 0); - } else if (v->cy > max_y) { - v->vy += v->cy - max_y; - max_y = v->buffer->nl - window->edit_h + 1; - if (v->vy > max_y && max_y >= 0) { - v->vy = max_y; - } - } -} - -void view_update(View *v, unsigned int scroll_margin) -{ - view_update_vx(v); - if (v->force_center || (v->center_on_scroll && view_is_cursor_visible(v))) { - view_center_to_cursor(v); - } else { - view_update_vy(v, scroll_margin); - } - v->force_center = false; - v->center_on_scroll = false; -} - -long view_get_preferred_x(View *v) -{ - if (v->preferred_x < 0) { - view_update_cursor_x(v); - v->preferred_x = v->cx_display; - } - return v->preferred_x; -} - -bool view_can_close(const View *view) -{ - const Buffer *buffer = view->buffer; - return !buffer_modified(buffer) || buffer->views.count > 1; -} - -StringView view_do_get_word_under_cursor(const View *view, size_t *offset_in_line) -{ - StringView line; - size_t si = fetch_this_line(&view->cursor, &line); - while (si < line.length) { - size_t i = si; - if (u_is_word_char(u_get_char(line.data, line.length, &i))) { - break; - } - si = i; - } - - if (si == line.length) { - *offset_in_line = 0; - return string_view(NULL, 0); - } - - size_t ei = si; - while (si > 0) { - size_t i = si; - if (!u_is_word_char(u_prev_char(line.data, &i))) { - break; - } - si = i; - } - - while (ei < line.length) { - size_t i = ei; - if (!u_is_word_char(u_get_char(line.data, line.length, &i))) { - break; - } - ei = i; - } - - *offset_in_line = si; - return string_view(line.data + si, ei - si); -} - -StringView view_get_word_under_cursor(const View *view) -{ - size_t offset_in_line; - return view_do_get_word_under_cursor(view, &offset_in_line); -} |