fis_lib_measure/lib/process/annotations/label_annotation.dart

import 'dart:ui' as ui;

import 'package:fis_measure/interfaces/date_types/point.dart';
import 'package:fis_measure/interfaces/enums/annotation.dart';
import 'package:fis_measure/interfaces/process/visuals/visual_area.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:flutter/material.dart';
import 'package:flutter/painting.dart';
import 'package:get/get.dart';

import 'annotation.dart';

/// 文本标签注释
class LabelAnnotation extends AnnotationItem<LabelAnnotationItemFeature> {
  LabelAnnotation() : super(AnnotationType.label);

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

  @override
  bool onExecuteTouch(PointInfo args) {
    if (state == AnnotationStates.finish || state == AnnotationStates.waiting) {
      if (args.pointType == PointInfoType.touchMove) {
        state = AnnotationStates.running;
      }
      return false;
    }
    if (state == AnnotationStates.running) {
      if (args.pointType == PointInfoType.touchMove) return false;
      if (args.pointType == PointInfoType.touchUp) {
        feature = LabelAnnotationItemFeature(this, args);
        if (feature != null) {
          doFeatureFinish();
        }
      }
    }
    return true;
  }
}

class LabelAnnotationItemFeature extends AnnotationItemFeature {
  late final String? text;
  late final IVisualArea? visualArea;
  LabelAnnotationItemFeature(LabelAnnotation ref, PointInfo pointInfo)
      : super(ref) {
    text = ref.text;
    visualArea = pointInfo.hostVisualArea;
    points.add(pointInfo);
  }

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