fis_lib_measure/lib/view/gesture/mouse_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:flutter/material.dart';
import 'package:get/get.dart';
import 'package:vid/us/vid_us_visual_area_type.dart';

import 'positioned_cursor.dart';

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

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

class _MeasureMouseGesturePanelState extends State<MeasureMouseGesturePanel> {
  Offset? mousePosition;
  Offset? cursorPosition;

  final mouseState = Get.put<IMouseState>(MouseState());
  late final application = Get.find<IApplication>();
  bool ifContainerTissueTM = false;
  CursorDisplayType displayType = CursorDisplayType.none;
  RectRegion tissueTMPixelRegion = RectRegion();

  @override
  void initState() {
    // TODO: from config
    mouseState.cursorSize = 32;
    _findMultiRegions();
    super.initState();
  }

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

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTapDown: (details) {
        application.createPointInfo(
          details.localPosition,
          PointInfoType.mouseDown,
        );
      },
      onPanDown: (details) {
        // application.createPointInfo(
        //   details.localPosition,
        //   PointInfoType.mouseDown,
        // );
      },
      onPanUpdate: (details) {
        mouseState.mousePosition = details.localPosition;
        application.createPointInfo(
          details.localPosition,
          PointInfoType.mouseMove,
        );
      },
      child: MouseRegion(
        cursor: SystemMouseCursors.none,
        onHover: (event) {
          mouseState.mousePosition = event.localPosition;
          application.createPointInfo(
            event.localPosition,
            PointInfoType.mouseMove,
          );
          _handleAreaChange(event.localPosition);
        },
        onEnter: (e) {
          setState(() {
            displayType = CursorDisplayType.normal;
          });
        },
        onExit: (e) {
          setState(() {
            displayType = CursorDisplayType.none;
          });
        },
        child: Stack(
          children: [
            _buildCursor(),
          ],
        ),
      ),
    );
  }

  Widget _buildCursor() {
    switch (displayType) {
      case CursorDisplayType.none:
        return Container();
      case CursorDisplayType.normal:
        return const PositionedCursor();
      case CursorDisplayType.cross:
        return CrossIndicator(
          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) {
          ifContainerTissueTM = true;

          ///TODO 此处选择用严格区域来作为 TissueTM 区域，也可以放宽到边界，以获得更好的体验
          ///TODO Left 好像不准？需要其他相关组进行调整
          tissueTMPixelRegion = RectRegion.rect(DRect(
            // area.displayRegion.left * displaySize.width,
            0,
            area.displayRegion.top * displaySize.height,
            area.displayRegion.width * displaySize.width,
            area.displayRegion.height * displaySize.height,
          ));
        }
      }
    }
  }
}

enum CursorDisplayType {
  none,
  cross,
  normal,
}