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High-Order Components を使って 再利用性が高いコードを書く
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Ryunosuke Watanabe
January 30, 2019
Programming
4
800
High-Order Components を使って 再利用性が高いコードを書く
Reactのコンポーネントを再利用するテクニック「High-Order Components(HOC)」をFlutterで使う方法を簡単な例で説明します。
Ryunosuke Watanabe
January 30, 2019
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Transcript
High-Order Components Λͬͯ ࠶ར༻ੑ͕ߴ͍ίʔυΛॻ͘ ᬒ ཾ೭հ @HeavenOSK
ࣗݾհ • ᬒ ཾ೭հʢΘͨͳɹΓΎ͏ͷ͚͢ʣ • Twitter - @HeavenOSK • ༻ݴޠɿDart/Swift/Kotlin
• FlutterΤϯδχΞʢΤψ࣍ݩגࣜձࣾʣ
ຊ
High-Order Components ͬͯԿʁ
High-Order Components(HOC) • Reactʹ͓͚ΔɺίϯϙʔωϯτΛ࠶ར༻͢ΔͨΊͷςΫ χοΫ • https://reactjs.org/docs/higher-order-components.html • ίϯϙʔωϯτΛऔಘͯ͠ɺ৽͍͠ίϯϙʔωϯτΛฦ͢ ؔ
FlutterReactʹӨڹΛड͚͍ͯΔ • FlutterͷઃܭίϯϙʔωϯτࢦͰɺReactʹӨڹΛड ͚͍ͯΔ • https://flutter.io/docs/resources/faq#does-flutter-come-with-a- framework • Reactͷ։ൃςΫχοΫɺFlutterͰద༻Ͱ͖Δ߹͕͋Δ •
Redux…΄͔ • High-Order Components - HOCɺFlutterͰద༻Ͱ͖Δ
HOCΛͲ͏͍͍͑Μ ͩΖ͏
ը໘ͷྫΛݟͳ͕Βߟ͑ͯΈ ·͢
ը໘༷ • ઃఆը໘ • Ϧετܗࣜ • ϦετΞΠςϜҰͭʹର ͯ͠ɺҰͭͷઃఆ߲
ը໘༷ʢৄࡉʣ • શମColumn͔ListView • ֤ߦ • ࠨଆTextʢڞ௨ͷελΠ ϧʣ • ӈଆ৭ʑ
• ButtonɺSwitchɺText
HOCΛΘͣʹ࣮ͨ͠ ίʔυΛݟͯΈ·͢ https://github.com/HeavenOSK/flutter_high_order_components/ commit/d3a8f61617e87f3a81accc2b9fa414f3e0f0c3cf
1.όʔδϣϯ൪߸ͷߦ Widget _buildVersionNumberRow() { return Container( height: 70.0, child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween, children: <Widget>[ Text( 'όʔδϣϯ', style: _LabelTextStyle, ), Text( '1.0.0', style: _InformationTextStyle, ), ], ), padding: EdgeInsets.symmetric(horizontal: 12.0), decoration: BoxDecoration( border: Border( bottom: BorderSide( width: 1.0, color: _BorderColor, ), ), ), ); }
2.ΞϓϦ࿈ܞͷߦ Widget _buildApplicationConnectionRow() { return Container( height: 70.0, child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween, children: <Widget>[ Text( 'ΞϓϦ࿈ܞ', style: _LabelTextStyle, ), Switch( value: false, onChanged: (currentValue) {}, ), ], ), padding: EdgeInsets.symmetric(horizontal: 12.0), decoration: BoxDecoration( border: Border( bottom: BorderSide( width: 1.0, color: _BorderColor, ), ), ), ); } Մม
Մม෦͚ͩ
HOCͰڞ௨Խͯ͠ΈΔ https://github.com/HeavenOSK/flutter_high_order_components
• Container, Row, Textڞ௨ • ӈଆͷ෦͚͕ͩՄมͰʮԿ͔ͷWidgetʯ͕ೖΔ • FlutterͰʮ͕ͯ͢Widgetʯ • ͭ·ΓӈଆʹʮWidgetΫϥεͷԿ͔ʯ͕ೖΔ
• (WidgetΛδΣωϦοΫͳίϯϙʔωϯτͷܕͱߟ͑Δ) ϙΠϯτ
֤ߦΛग़ྗ͢ΔHOC Widget _buildSettingsListItem(String label, {Widget rightSideWidget}) { final children =
List<Widget>(); children.add( Text(label, style: _LabelTextStyle), ); if (rightSideWidget != null) { children.add(rightSideWidget); } return Container( height: 70.0, child: Row( mainAxisAlignment: MainAxisAlignment.spaceBetween, children: children, ), padding: EdgeInsets.symmetric(horizontal: 12.0), decoration: BoxDecoration( border: Border( bottom: BorderSide( width: 1.0, color: _BorderColor, ), ), ), ); }
ݺͼग़͠ଆͷίʔυ _buildSettingsList() { return ListView( children: <Widget>[ _buildSettingsListItem( 'ΞϓϦ࿈ܞ', rightSideWidget:
Switch( value: false, onChanged: (currentValue) {}, ), ), _buildSettingsListItem( 'όʔδϣϯ', rightSideWidget: Text( '1.0.0', style: _InformationTextStyle, ), ), ], ); }
HOCʹͨ݁͠Ռ • ίʔυͷ΄ͱΜͲͷ෦Λڞ௨ԽͰ͖ͨ • ίʔυ͕ಡΈ͘͢ͳͬͨ • Ͳͷ෦͕ڞ௨෦͔ɺՄม෦͔ҰͰ͔Δ • →ίʔυͷϝϯςφϯε͕͍͢͠
·ͱΊ • Flutterʹ͓͚ΔHOCʮWidgetΛऔಘͯ͠ɺ৽͍͠WidgetΛ ฦؔ͢ʯ • Flutterͷඪ४ϥΠϒϥϦͰɺHOCΑ͘ΘΕ͍ͯΔ • ContainerColumnͳͲͷίϯετϥΫλɺchild/ childrenҾͰWidgetΛऔಘͯ͠ɺ৽ͨͳWidgetΛฦ͢ HOC
• ϥΠϒϥϦ࣮͚ͩͰͳ͘ɺΞϓϦͷϓϩάϥϜͰͬͯ ͍͖͍ͨ
͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝ ·ͨ͠ ᬒ ཾ೭հ @HeavenOSK