flutter 水印相机实现，图片编辑

1 效果图

WechatIMG5.jpeg WechatIMG6.jpeg WechatIMG7.jpeg

2 需要插件

  
/// 相机
 camera: ^0.10.3
///图片保存
 image_gallery_saver: ^1.7.1
///权限
 permission_handler: ^10.2.0
///代码tool
 common_utils: ^2.1.0
 flustars: ^2.0.1
///状态管理
 get: ^4.6.5
///获取水印当前位置
 flutter_bmflocation: ^3.3.0
///通知
 event_bus: ^2.0.0
///获取路径
 path_provider: ^2.0.1
///图片
 image: ^3.0.0
///签名
 screenshot: ^1.2.3

2代码实现

import 'dart:io';

import 'package:base_tool/dc_photos/fk_photos.dart';
import 'package:path_provider/path_provider.dart';

import 'camera_page_state.dart';



/// 拍照
void takePicture({required CameraPageState state,callBack}) async {

  if (state.cameraController == null || state.cameraController!.value.isTakingPicture) return;
  XFile file = await state.cameraController!.takePicture();
  state.curFile = file;
  if(callBack != null){
    callBack();
  }
}

/// 切换闪光灯
void toggleFlash({required CameraPageState state}) {
  if (state.cameraController == null) return;
  switch (state.cameraController!.value.flashMode) {
    case FlashMode.auto:
      state.cameraController!.setFlashMode(FlashMode.off);
      state.flashImagePath = "images/water/flash_off.png";
      break;
    case FlashMode.off:
      state.cameraController!.setFlashMode(FlashMode.torch);
      state.flashImagePath = "images/water/flash_on.png";
      break;
    case FlashMode.always:
      // state.cameraController!.setFlashMode(FlashMode.torch);
      // state.flashImagePath = "";
      // break;
    case FlashMode.torch:
      state.cameraController!.setFlashMode(FlashMode.auto);
      state.flashImagePath = "images/water/flash_auto.png";
      break;
  }
}

void toggleCameraLens( CameraPageState state,callBack) {
  final lensDirection = state.cameraController?.description.lensDirection;
  CameraDescription newDescription;
  if (lensDirection == CameraLensDirection.front) {
    newDescription =
        state.availableCameras!.firstWhere((description) => description
            .lensDirection == CameraLensDirection.back);
    callBack(newDescription);
  }
  else {
    newDescription =
        state.availableCameras!.firstWhere((description) => description
            .lensDirection == CameraLensDirection.front);
    callBack(newDescription);
  }
}

/// 生成临时文件
Future<String> generateCameraTempFilePath() async {
  final Directory tempDir = await getTemporaryDirectory();
  final Directory imgTempDir = Directory('${tempDir.path}/IMG_TEMP');
  if (!imgTempDir.existsSync()) {
    await imgTempDir.create();
  }
  final String fileName = "${DateTime.now().millisecondsSinceEpoch}.png" ;
  return '${imgTempDir.path}/$fileName';
}