onPanStart method

Implementation

void onPanStart(DragStartDetails details) {
  if (widget.controller.isEdit) {
    var x = details.localPosition.dx;
    var y = details.localPosition.dy;
    var handle = widget.controller.radius * 2;
    for (var j = widget.controller.lines.length - 1; j >= 0; j--) {
      var m = widget.controller.lines[j];
      for (var i = 0; i < m.line.length; i++) {
        var line = m.line[i];
        if (x > line.dx - handle &&
            x < line.dx + handle &&
            y > line.dy - handle &&
            y < line.dy + handle) {
          lineIndex = i;
          pathIndex = j;
          dragDot = true;
          break;
        }
      }
      if (lineIndex == -1 && pathIndex == -1) {
        if (m.contain(details.localPosition)) {
          dragDot = false;
          pathIndex = j;
          widget.controller.selectPathIndex = j;
          break;
        }
      }
    }
  } else {
    List<PathBean> lines = [];
    for (var m in widget.controller.lines) {
      Path path = Path();
      for (var j = 0; j < m.line.length; j++) {
        var line = m.line[j];
        if (j == 0) {
          path.moveTo(line.dx, line.dy);
        } else {
          path.lineTo(line.dx, line.dy);
        }
      }
      path.close();
      if (path.contains(details.localPosition)) {
        lines.add(m);
      }
    }

    widget.onShapeTap?.call(lines);
  }
}