fis_lib_measure/lib/process/annotations/input_annotation.dart

import 'package:flutter/painting.dart';
import 'package:fis_measure/interfaces/date_types/point.dart';
import 'package:fis_measure/interfaces/enums/annotation.dart';
import 'package:fis_measure/interfaces/process/workspace/application.dart';
import 'package:fis_measure/interfaces/process/workspace/point_info.dart';
import 'package:fis_measure/utils/canvas.dart';
import 'package:fis_measure/values/colors.dart';
import 'package:get/get.dart';

import 'annotation.dart';

/// 自定义文本注释
class InputAnnotation extends AnnotationItem<InputAnnotationItemFeature> {
  InputAnnotation() : super(AnnotationType.input);

  @override
  bool onExecuteMouse(PointInfo args) {
    if (state == AnnotationStates.finish || state == AnnotationStates.waiting) {
      if (args.pointType == PointInfoType.mouseDown) {
        feature = InputAnnotationItemFeature(this, args);
        state = AnnotationStates.running;
      }
      return false;
    }
    if (state == AnnotationStates.running) {
      if (args.pointType != PointInfoType.mouseDown) return false;

      _finishOnce();
      feature = InputAnnotationItemFeature(this, args);
      state = AnnotationStates.running;
    }
    return true;
  }

  @override
  bool onExecuteTouch(PointInfo args) {
    // TODO: implement onExecuteTouch
    throw UnimplementedError();
  }

  void _finishOnce() {
    if (text != null && text!.isNotEmpty) {
      if (feature != null) {
        feature!.text = text;
        doFeatureFinish(true);
      } else {
        doFeatureFinish(false);
      }
    } else {
      doFeatureFinish(false);
    }
    text = null;
  }

  @override
  void finishLast() {
    _finishOnce();
  }
}

class InputAnnotationItemFeature extends AnnotationItemFeature {
  String? text;

  InputAnnotationItemFeature(InputAnnotation ref, DPoint offset) : super(ref) {
    text = ref.text;
    points.add(offset);
  }

  @override
  void paint(Canvas canvas, Size size) {
    if (text == null) return;
    double fontSize = 14 * Get.find<IApplication>().displayScaleRatio;
    final style = TextStyle(
      fontSize: fontSize,
      color: MeasureColors.Primary,
    );
    final offset = convert2ViewPoint(size, position);
    canvas.drawText(
      text!,
      offset.toOffset(),
      style: style,
    );
  }
}