fis_lib_measure/lib/view/gesture/touch_gesture.dart

import 'package:fis_measure/interfaces/date_types/point.dart';
import 'package:fis_measure/interfaces/date_types/rect.dart';
import 'package:fis_measure/interfaces/date_types/rect_region.dart';
import 'package:fis_measure/interfaces/process/workspace/application.dart';
import 'package:fis_measure/interfaces/process/workspace/point_info.dart';
import 'package:fis_measure/view/gesture/cross_position_indicator.dart';
import 'package:fis_measure/view/gesture/mouse_gesture.dart';
import 'package:fis_measure/view/gesture/positioned_touch_cursor.dart';
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:vid/us/vid_us_visual_area_type.dart';

class MeasureTouchGesturePanel extends StatefulWidget {
  const MeasureTouchGesturePanel({Key? key}) : super(key: key);

  @override
  State<StatefulWidget> createState() => _MeasureTouchGesturePanelState();
}

class _MeasureTouchGesturePanelState extends State<MeasureTouchGesturePanel> {
  late final application = Get.find<IApplication>();

  final touchState = Get.find<ITouchPointState>();

  CursorDisplayType displayType = CursorDisplayType.none;
  RectRegion tissueTMPixelRegion = RectRegion();
  bool ifContainerTissueTM = false;
  Offset _lastPosition = Offset.zero;

  @override
  void initState() {
    _findMultiRegions();
    super.initState();
  }

  @override
  void dispose() {
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      behavior: HitTestBehavior.opaque,
      onTapDown: (details) {
        touchState.mousePosition = details.localPosition;
        _handleAreaChange(details.localPosition);
        application.createPointInfo(
          details.localPosition,
          PointInfoType.touchDown,
        );
      },
      onPanDown: (details) {
        touchState.mousePosition = details.localPosition;
        _handleAreaChange(details.localPosition);
        application.createPointInfo(
          details.localPosition,
          PointInfoType.touchDown,
        );
      },
      onPanUpdate: (details) {
        touchState.mousePosition = details.localPosition;
        _handleAreaChange(details.localPosition);
        _lastPosition = details.localPosition;
        application.createPointInfo(
          details.localPosition,
          PointInfoType.touchMove,
        );
      },
      onTapUp: (details) {
        touchState.mousePosition = details.localPosition;
        setState(() {
          displayType = CursorDisplayType.normal;
        });
        application.createPointInfo(
          details.localPosition,
          PointInfoType.touchUp,
        );
      },
      onPanEnd: (details) {
        application.createPointInfo(
          _lastPosition,
          PointInfoType.touchUp,
        );
        setState(() {
          displayType = CursorDisplayType.normal;
        });
      },
      child: _buildCursor(),
    );
  }

  Widget _buildCursor() {
    switch (displayType) {
      case CursorDisplayType.none:
        return Container();
      case CursorDisplayType.normal:
        return Container();
      case CursorDisplayType.cross:
        return Stack(
          children: [
            MobileCrossIndicator(
              areaRegion: Rect.fromLTRB(
                  tissueTMPixelRegion.left,
                  tissueTMPixelRegion.top,
                  tissueTMPixelRegion.right,
                  tissueTMPixelRegion.bottom),
            ),
          ],
        );
    }
  }

  void _handleAreaChange(Offset pointerOffset) {
    if (ifContainerTissueTM) {
      if (tissueTMPixelRegion
          .containsPoint(DPoint.parseOffset(pointerOffset))) {
        if (displayType != CursorDisplayType.cross) {
          setState(() {
            displayType = CursorDisplayType.cross;
          });
        }
      } else {
        if (displayType != CursorDisplayType.normal) {
          setState(() {
            displayType = CursorDisplayType.normal;
          });
        }
      }
    }
  }

  void _findMultiRegions() {
    final displaySize = application.displaySize;
    for (var visual in application.visuals) {
      for (var area in visual.visualAreas) {
        if (area.visualAreaType == VidUsVisualAreaType.TissueTimeMotion ||
            area.visualAreaType == VidUsVisualAreaType.Doppler) {
          ifContainerTissueTM = true;

          ///TODO 由于布局问题 Left 定位给不准，这里放宽到边界
          tissueTMPixelRegion = RectRegion.rect(DRect(
            // area.displayRegion.left * displaySize.width,
            0,
            area.displayRegion.top * displaySize.height,
            // area.displayRegion.width * displaySize.width,
            displaySize.width,
            area.displayRegion.height * displaySize.height,
          ));
        }
      }
    }
  }
}