Flutter插件saw的介绍与使用

Flutter插件saw的介绍与使用

Flutter插件saw的简介

本文档将介绍如何在Flutter中使用一个名为saw的未知功能插件。虽然插件的具体功能尚未明确，但根据其名称推测，它可能与系统窗口或通知栏相关。以下是基于假设的功能实现的一个示例。

示例代码

以下是一个完整的示例代码，展示了如何使用该插件来创建、更新和关闭系统弹窗。

文件结构
example/
├── lib/
│   ├── main.dart
│   └── system_back_window.dart
└── assets/
    └── images/
        └── test.png
lib/main.dart
import 'dart:io';
import 'dart:typed_data';

import 'package:flutter/material.dart';
import 'dart:async';

import 'package:flutter/services.dart';
import 'package:saw/system_alert_window.dart'; // 假设插件名为"saw"
import 'package:system_back_window/system_back_window.dart'; // 自定义类
import 'package:url_launcher/url_launcher.dart';

void main() => runApp(MyApp());

class MyApp extends StatefulWidget {
  [@override](/user/override)
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String _platformVersion = 'Unknown';
  bool _isShowingWindow = false;
  bool _isUpdatedWindow = false;
  SystemWindowPrefMode prefMode = SystemWindowPrefMode.OVERLAY;

  [@override](/user/override)
  void initState() {
    super.initState();
    _initPlatformState();
    _requestPermissions();
    BackendWindow()
        .show(title: "'gameMode')", duration: "2000", btns: [
      WindowBtnParam(tag: 'plus', imgpath: 'assets/images/test.png'),
      WindowBtnParam(tag: 'subtract', imgpath: 'assets/images/test.png'),
      WindowBtnParam(tag: 'back', imgpath: 'assets/images/test.png')
    ], texts: [
      WindowTextParam(text: 'a'),
      WindowTextParam(
          text: '2'),
      WindowTextParam(
          text: '3'),
    ]);
    // SystemAlertWindow.registerOnClickListener(callBack);
  }

  // 初始化平台状态
  Future<void> _initPlatformState() async {
    String platformVersion;
    try {
      platformVersion = await SystemAlertWindow.platformVersion;
    } on PlatformException {
      platformVersion = 'Failed to get platform version.';
    }
    if (!mounted) return;
    setState(() {
      _platformVersion = platformVersion;
    });
  }

  // 请求权限
  Future<void> _requestPermissions() async {
    await SystemAlertWindow.requestPermissions(prefMode: prefMode);
  }

  // 显示系统弹窗
  void _showOverlayWindow() async {
    if (await canLaunch('youkuad://')) {
      Future.delayed(Duration(seconds: 2), () async {
        await launch('youkuad://');
      });
    }
    Uint8List uint8list =
        (await rootBundle.load('assets/images/test.png')).buffer.asUint8List();

    if (!_isShowingWindow) {
      SystemWindowBody body = SystemWindowBody(
        rows: [
          EachRow(columns: [
            EachColumn(
                text: SystemWindowText(
                    text: "自由模式",
                    fontSize: 12,
                    textColor: Colors.black87,
                    fontWeight: FontWeight.BOLD),
                padding: SystemWindowPadding.setSymmetricPadding(6, 8),
                decoration: SystemWindowDecoration(
                    startColor: Colors.black12, borderRadius: 25.0),
                margin: SystemWindowMargin(top: 4)),
          ], gravity: ContentGravity.CENTER),
          EachRow(
            margin: SystemWindowMargin.setSymmetricMargin(20, 0),
            columns: [
              EachColumn(
                  widgetStyle: 1,
                  margin: SystemWindowMargin.setSymmetricMargin(0, 10),
                  imgBtn: SystemWindowImageButton(
                      width: 25,
                      height: 25,
                      image: uint8list,
                      size: 30,
                      tag: 'simple_button')),
              EachColumn(
                  widgetStyle: 1,
                  margin: SystemWindowMargin.setSymmetricMargin(0, 10),
                  imgBtn: SystemWindowImageButton(
                      width: 25,
                      height: 25,
                      image: uint8list,
                      size: 30,
                      tag: 'simple_button')),
              EachColumn(
                  widgetStyle: 1,
                  margin: SystemWindowMargin.setSymmetricMargin(0, 10),
                  imgBtn: SystemWindowImageButton(
                      width: 25,
                      height: 25,
                      image: uint8list,
                      size: 30,
                      tag: 'simple_button')),
            ],
            gravity: ContentGravity.CENTER,
          ),
          EachRow(
            columns: [
              EachColumn(
                margin: SystemWindowMargin.setSymmetricMargin(0, 10),
                text: SystemWindowText(
                    text: "00\n\n力量", fontSize: 10, textColor: Colors.black45),
              ),
              EachColumn(
                margin: SystemWindowMargin.setSymmetricMargin(0, 10),
                text: SystemWindowText(
                    text: "00\n\n力量", fontSize: 10, textColor: Colors.black45),
              ),
              EachColumn(
                margin: SystemWindowMargin.setSymmetricMargin(0, 10),
                text: SystemWindowText(
                    text: "00\n\n力量", fontSize: 10, textColor: Colors.black45),
              ),
            ],
            gravity: ContentGravity.CENTER,
          )
        ],
        padding: SystemWindowPadding(left: 16, right: 16, bottom: 12, top: 12),
      );

      SystemAlertWindow.showSystemWindow(
          height: 160,
          width: 220,
          body: body,
          margin: SystemWindowMargin(left: 8, right: 8, top: 200, bottom: 0),
          gravity: SystemWindowGravity.CENTER,
          notificationTitle: "Incoming Call",
          notificationBody: "+1 646 980 4741",
          prefMode: prefMode);

      setState(() {
        _isShowingWindow = true;
      });
    } else if (!_isUpdatedWindow) {
      SystemWindowBody body = SystemWindowBody(
        rows: [
          EachRow(
            columns: [
              EachColumn(
                text: SystemWindowText(
                    text: "Updated body",
                    fontSize: 12,
                    textColor: Colors.black45),
              ),
            ],
            gravity: ContentGravity.CENTER,
          ),
          EachRow(columns: [
            EachColumn(
                text: SystemWindowText(
                    text: "Updated long data of the body",
                    fontSize: 12,
                    textColor: Colors.black87,
                    fontWeight: FontWeight.BOLD),
                padding: SystemWindowPadding.setSymmetricPadding(6, 8),
                decoration: SystemWindowDecoration(
                    startColor: Colors.black12, borderRadius: 25.0),
                margin: SystemWindowMargin(top: 4)),
          ], gravity: ContentGravity.CENTER),
          EachRow(
            columns: [
              EachColumn(
                text: SystemWindowText(
                    text: "Notes", fontSize: 10, textColor: Colors.black45),
              ),
            ],
            gravity: ContentGravity.LEFT,
            margin: SystemWindowMargin(top: 8),
          ),
          EachRow(
            columns: [
              EachColumn(
                text: SystemWindowText(
                    text: "Updated random notes.",
                    fontSize: 13,
                    textColor: Colors.black54,
                    fontWeight: FontWeight.BOLD),
              ),
            ],
            gravity: ContentGravity.LEFT,
          ),
        ],
        padding: SystemWindowPadding(left: 16, right: 16, bottom: 12, top: 12),
      );

      SystemAlertWindow.updateSystemWindow(
          height: 230,
          body: body,
          margin: SystemWindowMargin(left: 8, right: 8, top: 200, bottom: 0),
          gravity: SystemWindowGravity.TOP,
          notificationTitle: "Outgoing Call",
          notificationBody: "+1 646 980 4741",
          prefMode: prefMode);

      setState(() {
        _isUpdatedWindow = true;
      });
    } else {
      setState(() {
        _isShowingWindow = false;
        _isUpdatedWindow = false;
      });
      SystemAlertWindow.closeSystemWindow(prefMode: prefMode);
    }
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('System Alert Window Example App'),
        ),
        body: Center(
          child: Column(
            children: <Widget>[
              Text('Running on: $_platformVersion\n'),
              Padding(
                padding: const EdgeInsets.symmetric(vertical: 8.0),
                child: MaterialButton(
                  onPressed: _showOverlayWindow,
                  textColor: Colors.white,
                  child: !_isShowingWindow
                      ? Text("Show system alert window")
                      : !_isUpdatedWindow
                          ? Text("Update system alert window")
                          : Text("Close system alert window"),
                  color: Colors.deepOrange,
                  padding: const EdgeInsets.symmetric(vertical: 8.0),
                ),
              )
            ],
          ),
        ),
      ),
    );
  }
}

// 按钮点击回调
void callBack(String tag) {
  print(tag);
  switch (tag) {
    case "simple_button":
    case "updated_simple_button":
      SystemAlertWindow.closeSystemWindow(
          prefMode: SystemWindowPrefMode.OVERLAY);
      break;
    case "focus_button":
      print("Focus button has been called");
      break;
    default:
      print("OnClick event of $tag");
  }
}

更多关于Flutter插件saw的介绍与使用的实战教程也可以访问 https://www.itying.com/category-92-b0.html

1 回复

更多关于Flutter插件saw的介绍与使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html


由于插件 saw 的功能介绍为 undefined，我们无法直接了解其具体用途。但是，我们可以通过插件的名称进行合理推测，并结合 Flutter 开发中的常见需求，提供一些可能的使用场景和示例代码。

1. 推测插件功能

Saw 在英文中有“锯子”或“切割”的意思，因此可以推测该插件可能与以下功能相关：

  • 图像处理：如裁剪、分割图像。
  • 音视频处理：如切割音视频文件。
  • 数据分割：如将数据分割成多个部分进行处理。
  • UI 组件：如提供类似“锯子”效果的 UI 组件（例如锯齿形边框）。

2. 假设插件功能为图像裁剪

假设 saw 插件用于图像裁剪，我们可以提供以下示例代码：

import 'package:flutter/material.dart';
import 'package:saw/saw.dart'; // 假设插件导入路径

class ImageCropPage extends StatefulWidget {
  [@override](/user/override)
  _ImageCropPageState createState() => _ImageCropPageState();
}

class _ImageCropPageState extends State<ImageCropPage> {
  ImageProvider? _croppedImage;

  Future<void> _cropImage() async {
    // 假设插件提供了 cropImage 方法
    final croppedImage = await Saw.cropImage(
      imagePath: 'assets/example.jpg',
      cropRect: Rect.fromLTWH(50, 50, 200, 200), // 裁剪区域
    );
    setState(() {
      _croppedImage = croppedImage;
    });
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Image Crop with Saw'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            if (_croppedImage != null)
              Image(image: _croppedImage!)
            else
              Text('No image cropped yet.'),
            SizedBox(height: 20),
            ElevatedButton(
              onPressed: _cropImage,
              child: Text('Crop Image'),
            ),
          ],
        ),
      ),
    );
  }
}

void main() {
  runApp(MaterialApp(
    home: ImageCropPage(),
  ));
}

3. 假设插件功能为音视频切割

假设 saw 插件用于音视频切割，我们可以提供以下示例代码：

import 'package:flutter/material.dart';
import 'package:saw/saw.dart'; // 假设插件导入路径

class AudioVideoCutPage extends StatefulWidget {
  [@override](/user/override)
  _AudioVideoCutPageState createState() => _AudioVideoCutPageState();
}

class _AudioVideoCutPageState extends State<AudioVideoCutPage> {
  String? _cutFilePath;

  Future<void> _cutAudioVideo() async {
    // 假设插件提供了 cutAudioVideo 方法
    final cutFilePath = await Saw.cutAudioVideo(
      filePath: 'assets/example.mp4',
      startTime: Duration(seconds: 10), // 开始时间
      endTime: Duration(seconds: 20),   // 结束时间
    );
    setState(() {
      _cutFilePath = cutFilePath;
    });
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Audio/Video Cut with Saw'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            if (_cutFilePath != null)
              Text('Cut file saved at: $_cutFilePath')
            else
              Text('No file cut yet.'),
            SizedBox(height: 20),
            ElevatedButton(
              onPressed: _cutAudioVideo,
              child: Text('Cut Audio/Video'),
            ),
          ],
        ),
      ),
    );
  }
}

void main() {
  runApp(MaterialApp(
    home: AudioVideoCutPage(),
  ));
}
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