Flutter图片编辑插件easy_image_editor的使用
Flutter 图片编辑插件 easy_image_editor 的使用
Easy Image Editor
EasyImageEditor 可以在背景图像或颜色上添加任何类型的部件,并移动这些部件、调整大小、旋转。
特性
- 更改编辑器背景颜色。
- 在编辑器中添加任何部件作为背景。
- 在编辑器上添加任何部件。
- 移动、调整大小、翻转、缩放和旋转已添加的部件。
- 使用另一个部件更新已添加的部件。
- 允许撤销和重做。
- 允许单选和多选。
- 允许更改边框颜色和移除图标。
- 删除已添加的部件。
- 手动处理所有操作。
开始使用
首先,在 pubspec.yaml
文件中将 easy_image_editor
添加为依赖项。
然后,在文件中导入 easy_image_editor
包:
import 'package:easy_image_editor/easy_image_editor.dart';
使用示例
以下是一个完整的示例代码,展示了如何使用 easy_image_editor
插件来编辑图片。
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'package:easy_image_editor/easy_image_editor.dart';
import 'dart:io';
import 'result.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
[@override](/user/override)
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: const MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key, required this.title}) : super(key: key);
final String title;
[@override](/user/override)
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
late EasyImageEditorController _easyImageEditorController;
final ImagePicker _picker = ImagePicker();
final List<Color> _colorArray = [
Colors.red,
Colors.black,
Colors.white,
Colors.amber,
Colors.black38,
Colors.yellow,
Colors.orange,
Colors.deepOrange,
Colors.pink,
Colors.blue,
Colors.cyan,
Colors.deepPurple,
Colors.teal,
];
[@override](/user/override)
void initState() {
super.initState();
}
[@override](/user/override)
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
actions: [
IconButton(
onPressed: () => _easyImageEditorController.canEditMultipleView(false),
icon: const Icon(Icons.photo_size_select_large),
),
IconButton(
onPressed: () => _easyImageEditorController.canEditMultipleView(true),
icon: const Icon(Icons.select_all),
),
IconButton(
onPressed: () => _easyImageEditorController.undo(),
icon: const Icon(Icons.undo),
),
IconButton(
onPressed: () => _easyImageEditorController.redo(),
icon: const Icon(Icons.redo),
),
IconButton(
onPressed: () {
_easyImageEditorController.saveEditing().then((value) {
if (value != null) {
Navigator.push(
context,
MaterialPageRoute(
builder: (builder) => Result(uint8list: value)));
}
});
},
icon: const Icon(Icons.done_all),
),
],
),
body: EditorView(
borderColor: Colors.red,
clickToFocusAndMove: false,
onInitialize: (controller) {
setState(() {
_easyImageEditorController = controller;
});
},
removeIcon: const Icon(
Icons.cancel_outlined,
size: 20.0,
),
onViewTouchOver: (position, widget, widgetType) {
debugPrint("onViewTouch: $position, $widgetType");
},
onClick: (position, widget, widgetType) {
debugPrint("onViewClick");
if (widgetType == "text") {
Text _text = widget as Text;
_addText(position, _text);
}
},
),
bottomNavigationBar: BottomNavigationBar(
items: const [
BottomNavigationBarItem(
icon: Icon(Icons.text_fields),
label: "Add Text",
),
BottomNavigationBarItem(
icon: Icon(Icons.image),
label: "Add Image",
),
BottomNavigationBarItem(
icon: Icon(Icons.color_lens),
label: "Add Color",
),
],
onTap: (position) {
switch (position) {
case 0:
_addText(null, null);
break;
case 1:
_addImage();
break;
case 2:
_addBg();
break;
}
},
),
);
}
void _addText(int? position, Text? text) {
final textEditController = TextEditingController(text: text?.data);
Color? textColor = text?.style?.color;
showModalBottomSheet(
context: context,
builder: (BuildContext context) {
return StatefulBuilder(builder: (context, stateSetter) {
return Column(
children: [
Padding(
padding: const EdgeInsets.all(10.0),
child: TextField(
controller: textEditController,
keyboardType: TextInputType.text,
textInputAction: TextInputAction.done,
decoration: const InputDecoration(
hintText: "Enter Text",
),
style: TextStyle(color: textColor),
),
),
SizedBox(
height: 60,
child: ListView.builder(
shrinkWrap: true,
itemCount: _colorArray.length,
scrollDirection: Axis.horizontal,
itemBuilder: (context, index) {
return InkWell(
onTap: () {
stateSetter(() {
textColor = _colorArray[index];
});
},
child: Container(
height: 50.0,
width: 50.0,
color: _colorArray[index],
),
);
},
),
),
InkWell(
onTap: () {
if (textEditController.text.isNotEmpty) {
Navigator.pop(context);
if (text == null) {
_easyImageEditorController.addView(
Text(
textEditController.text,
style: TextStyle(
fontSize: 20.0,
color: textColor,
),
),
widgetType: "text",
);
} else {
_easyImageEditorController.updateView(
position!,
Text(
textEditController.text,
style: TextStyle(
fontSize: 20.0,
color: textColor,
fontWeight: FontWeight.bold,
),
),
);
}
}
},
child: Container(
width: 100.0,
margin: const EdgeInsets.all(20.0),
padding: const EdgeInsets.all(10.0),
decoration: BoxDecoration(
color: Theme.of(context).primaryColor,
borderRadius:
const BorderRadius.all(Radius.circular(10))),
child: const Center(
child: Text("Add"),
),
),
),
],
);
});
});
}
_addBg() {
showModalBottomSheet(
context: context,
builder: (context) {
return SizedBox(
height: 60,
child: ListView.builder(
shrinkWrap: true,
itemCount: _colorArray.length,
scrollDirection: Axis.horizontal,
itemBuilder: (context, index) {
return InkWell(
onTap: () {
Navigator.pop(context);
_easyImageEditorController
.addBackgroundColor(_colorArray[index]);
},
child: Container(
height: 50.0,
width: 50.0,
color: _colorArray[index],
),
);
},
),
);
});
}
_addImage() {
showModalBottomSheet(
context: context,
builder: (context) {
return Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
InkWell(
onTap: () async {
final XFile? image =
await _picker.pickImage(source: ImageSource.gallery);
if (image != null) {
Navigator.pop(context);
_easyImageEditorController
.addBackgroundView(Image.file(File(image.path)));
}
},
child: const Padding(
padding: EdgeInsets.all(20),
child: Text(
"Set Background",
style: TextStyle(fontSize: 18.0),
),
),
),
InkWell(
onTap: () async {
final XFile? image =
await _picker.pickImage(source: ImageSource.gallery);
if (image != null) {
Navigator.pop(context);
_easyImageEditorController.addView(
Image.file(
File(image.path),
height: 200,
width: 200,
),
widgetType: "image");
}
},
child: const Padding(
padding: EdgeInsets.all(20),
child: Text(
"Add View",
style: TextStyle(fontSize: 18.0),
),
),
),
],
);
});
}
}
更多关于Flutter图片编辑插件easy_image_editor的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
更多关于Flutter图片编辑插件easy_image_editor的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
当然,以下是如何在Flutter项目中使用easy_image_editor
插件的示例代码。这个插件允许你对图片进行基本的编辑操作,比如裁剪、旋转、滤镜等。
首先,你需要在你的pubspec.yaml
文件中添加easy_image_editor
依赖:
dependencies:
flutter:
sdk: flutter
easy_image_editor: ^latest_version # 请替换为最新版本号
然后运行flutter pub get
来安装依赖。
接下来,你可以在你的Flutter项目中使用EasyImageEditor
组件。以下是一个完整的示例代码,展示了如何使用这个插件:
import 'package:flutter/material.dart';
import 'package:easy_image_editor/easy_image_editor.dart';
import 'package:image_picker/image_picker.dart'; // 用于选择图片
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Image Editor Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: ImageEditorScreen(),
);
}
}
class ImageEditorScreen extends StatefulWidget {
@override
_ImageEditorScreenState createState() => _ImageEditorScreenState();
}
class _ImageEditorScreenState extends State<ImageEditorScreen> {
File? imageFile;
final ImagePicker _picker = ImagePicker();
Future<void> pickImage() async {
final pickedFile = await _picker.pickImage(source: ImageSource.camera);
if (pickedFile != null) {
setState(() {
imageFile = File(pickedFile.path);
});
}
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Image Editor Demo'),
),
body: Center(
child: imageFile == null
? Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text('No image selected.'),
ElevatedButton(
onPressed: pickImage,
child: Text('Pick Image'),
),
],
)
: EasyImageEditor(
image: imageFile!,
cropAspectRatioPresets: [
CropAspectRatioPreset.square,
CropAspectRatioPreset.ratio3x2,
CropAspectRatioPreset.original,
CropAspectRatioPreset.ratio4x3,
CropAspectRatioPreset.ratio16x9
],
onSave: (File editedImage) async {
// 处理保存后的图片
print('Saved image path: ${editedImage.path}');
// 可以在这里将图片上传到服务器或保存到本地
},
),
),
);
}
}
在这个示例中:
- 我们首先使用
ImagePicker
从相机或图库中选择一张图片。 - 选择完图片后,我们将图片文件传递给
EasyImageEditor
组件。 EasyImageEditor
组件允许用户对图片进行编辑,比如裁剪、旋转等。- 用户完成编辑后,可以通过
onSave
回调获取编辑后的图片文件。
请确保你已经添加了image_picker
插件的依赖,因为它用于从设备中选择图片。同样,easy_image_editor
的最新版本号可以在pub.dev网站上找到,并替换示例中的latest_version
。
这个示例展示了基本的图片编辑功能,你可以根据需求进一步扩展和自定义编辑功能。