Flutter Screenshot Example

---

在 Flutter 中利用 RepaintBoundary 和 GlobalKey 將 Widget 截圖轉成圖片 (PNG)。
轉成 Uint8List 後，就可以做到：

• 顯示：使用 Image.memory 預覽
• 儲存：透過 gal 套件存入相簿
• 分享：透過 share_plus 分享到其他 App
• 上傳：透過 dio 傳到伺服器

---

功能

App 內提供四個按鈕，對截圖結果進行操作：

• 顯示 – 在 Dialog 中預覽截圖
• 儲存 – 存到相簿
• 分享 – 呼叫系統分享功能
• 上傳 – 透過 API 上傳到後端

---

使用場景

• 問題回報 – 回報錯誤時附帶螢幕截圖，方便除錯
• 邀請卡片 – 自動生成含 QR Code 的分享卡片
• 簽名截圖 – 將手寫簽名或筆跡存成圖片
• 輸出海報 – 將動態組合的 Widget 輸出成 PNG 分享

---

This project demonstrates how to capture a Flutter widget as an image (PNG) using RepaintBoundary and GlobalKey.
Once the widget is converted to Uint8List, you can easily:

• Preview it with Image.memory
• Save it to the gallery with gal
• Share it with share_plus
• Upload it to a server with dio

---

Features

The app includes four built-in actions for the captured image:

• Preview – show the screenshot in a dialog
• Save – store the image in the photo gallery
• Share – share the image with other apps
• Upload – send the image to a backend via API

---

Use Cases

• Bug reporting – attach a screenshot when submitting issues
• Invitation cards – generate a shareable card with QR code
• Signature capture – save handwritten signatures as images
• Poster generator – export dynamically built widgets as PNGs to share