【Flutter 專題】125 圖解自傳 ACE_ICON.ttf 圖示庫

阿策小和尚發表於2021-05-29

Flutter圖解

小菜在學習過程中通常會需要大量的小圖示，而多數的 Icon 都是經過設計同學優化過的，而如何採用類似系統 Icons 方式，此時可以通過自傳類似字型庫的 ttf 圖示庫的方式來完成；

ACE_ICON

小菜推薦兩個網站可以用來生成圖示庫；

1. 生成 ACE_ICON.ttf 圖示庫

小菜以 https://www.fluttericon.com/ 為例來生成圖示庫；在這個圖示庫中有很多成套的圖示，在這裡可以選中需要的圖示，也可以將本地生成的 .svg 檔案拖拽進庫中；

其中設定完圖示庫名稱後，通過工具選擇下載不同的檔案，包括 ttf 圖示庫、config 配置檔案以及 mapping 對映檔案；

2. 整合 ttf 圖示庫

將 ACE_ICON.ttf 庫檔案新增到 project 資原始檔中；

在 pubspec.yaml 檔案中宣告 ACE_ICON.tt 檔案庫；宣告方式與字型庫等一致，注意 family 與 font 名稱一致；在此可以宣告引入多個資源庫檔案；之後 pub get 即可；

fonts:
  - family: DancingScript
    fonts:
      - asset: assets/DancingScript-Regular.ttf
  - family: ACE_ICON
    fonts:
      - asset: images/ACE_ICON.ttf
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將 mapping 檔案新增到 project 中，用於對映 ACE_ICON 圖示庫中各 Icons 檔案；

class ACE_ICON {
  ACE_ICON._();

  static const _kFontFam = 'ACE_ICON';
  static const String _kFontPkg = null;

  static const IconData emo_happy = IconData(0xe800, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_wink = IconData(0xe801, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_unhappy = IconData(0xe802, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_sleep = IconData(0xe803, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_thumbsup = IconData(0xe804, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_devil = IconData(0xe805, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_surprised = IconData(0xe806, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_tongue = IconData(0xe807, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_coffee = IconData(0xe808, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_sunglasses = IconData(0xe809, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_displeased = IconData(0xe80a, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_beer = IconData(0xe80b, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_grin = IconData(0xe80c, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_angry = IconData(0xe80d, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_saint = IconData(0xe80e, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_cry = IconData(0xe80f, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_shoot = IconData(0xe810, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_squint = IconData(0xe811, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_laugh = IconData(0xe812, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData emo_wink2 = IconData(0xe813, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData book_story = IconData(0xe814, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData book_type = IconData(0xe815, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData book_user = IconData(0xe816, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData crown = IconData(0xe844, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData crown_plus = IconData(0xe845, fontFamily: _kFontFam, fontPackage: _kFontPkg);
  static const IconData crown_minus = IconData(0xe846, fontFamily: _kFontFam, fontPackage: _kFontPkg);
}
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3. 圖示庫 IconData

整合之後，使用方式與預設的 Icon 一致，直接獲取 IconData 即可，對於 Icon 的顏色尺寸等其他繪製也不會有影響；

List aceIconData = [
  ACE_ICON.book_story, ACE_ICON.book_type, ACE_ICON.book_user, ACE_ICON.crown,
  ACE_ICON.crown_minus, ACE_ICON.crown_plus, ACE_ICON.emo_angry, ACE_ICON.emo_beer,
  ACE_ICON.emo_coffee, ACE_ICON.emo_cry, ACE_ICON.emo_devil, ACE_ICON.emo_displeased,
  ACE_ICON.emo_grin, ACE_ICON.emo_happy, ACE_ICON.emo_laugh, ACE_ICON.emo_saint,
  ACE_ICON.emo_shoot, ACE_ICON.emo_sleep, ACE_ICON.emo_squint, ACE_ICON.emo_sunglasses,
  ACE_ICON.emo_surprised, ACE_ICON.emo_thumbsup, ACE_ICON.emo_tongue, 
  ACE_ICON.emo_unhappy, ACE_ICON.emo_wink, ACE_ICON.emo_wink2
];

return SliverPadding(
    padding: const EdgeInsets.all(8.0),
    sliver: SliverGrid(
        gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
            crossAxisCount: 6, mainAxisSpacing: 8.0, crossAxisSpacing: 8.0, childAspectRatio: 1.0),
        delegate: SliverChildBuilderDelegate(
            (context, index) => Container(
                decoration: BoxDecoration(color: Colors.grey.withOpacity(0.2), borderRadius: BorderRadius.circular(3.0)),
                child: Center(child: Icon(dataList[index], color: Colors.blue.withOpacity(0.6)))),
            childCount: dataList.length)));
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