dartterm/lib/terminal/cursor.dart

part of '../terminal.dart';

var _nextHighlightGroup = 0;

class Cursor {
  final Terminal t;
  int x, y;
  Color? _bg, _fg;
  Font font = Font.normal;
  int? highlightGroup;
  final List<Act> _acts = [];

  // TODO: Clip

  Cursor({required this.t, required this.x, required this.y});

  void clear() {
    t._tiles = [for (var i = 0; i < nTiles; i += 1) Tile()];
  }

  void putc(int c) {
    for (var dx = 0; dx < font.cellWidth; dx += 1) {
      for (var dy = 0; dy < font.cellHeight; dy += 1) {
        var i = t._fromXY(x + dx, y + dy);

        if (i != null) {
          final (sourceCx, sourceCy) = (
            (c % font.nCellsW) * font.cellWidth + dx,
            (c ~/ font.nCellsW) * font.cellHeight + dy
          );

          t._tiles[i].content = Content(font.imageName, sourceCx, sourceCy);

          final (bg, fg) = (_bg, _fg);
          if (bg != null) {
            t._tiles[i].bg = bg;
          }
          if (fg != null) {
            t._tiles[i].fg = fg;
          }
          if (highlightGroup != null) {
            t._tiles[i].highlightGroup = highlightGroup;
          }

          t._tiles[i].actions.addAll(_acts);
        }
      }
    }
  }

  void puts(String s) {
    var startX = x;
    for (final c in toCp437String(s)) {
      if (c == 10) {
        // newline
        x = startX;
        y += font.cellHeight;
        continue;
      }
      if (c == 13) {
        // carriage return
        x = startX;
        continue;
      }
      putc(c);
      x += font.cellWidth;
    }
  }

  Cursor fg(Color c) {
    _fg = c;
    return this;
  }

  Cursor bg(Color c) {
    _bg = c;
    return this;
  }

  Cursor small() {
    font = Font.small;
    return this;
  }

  Cursor normal() {
    font = Font.normal;
    return this;
  }

  Cursor big() {
    font = Font.big;
    return this;
  }

  Cursor highlight() {
    highlightGroup = _nextHighlightGroup;
    _nextHighlightGroup += 1;
    return this;
  }

  Cursor act(Act a) {
    _acts.add(a);
    return this;
  }
}