├── .gitignore ├── .metadata ├── README.md ├── android ├── app │ ├── build.gradle │ └── src │ │ ├── debug │ │ └── AndroidManifest.xml │ │ ├── main │ │ ├── AndroidManifest.xml │ │ ├── java │ │ │ └── com │ │ │ │ └── example │ │ │ │ └── appbar_gradient │ │ │ │ └── MainActivity.java │ │ └── res │ │ │ ├── drawable │ │ │ └── launch_background.xml │ │ │ ├── mipmap-hdpi │ │ │ └── ic_launcher.png │ │ │ ├── mipmap-mdpi │ │ │ └── ic_launcher.png │ │ │ ├── mipmap-xhdpi │ │ │ └── ic_launcher.png │ │ │ ├── mipmap-xxhdpi │ │ │ └── ic_launcher.png │ │ │ ├── mipmap-xxxhdpi │ │ │ └── ic_launcher.png │ │ │ └── values │ │ │ └── styles.xml │ │ └── profile │ │ └── AndroidManifest.xml ├── build.gradle ├── gradle.properties ├── gradle │ └── wrapper │ │ └── gradle-wrapper.properties └── settings.gradle ├── ios ├── Flutter │ ├── AppFrameworkInfo.plist │ ├── Debug.xcconfig │ └── Release.xcconfig ├── Runner.xcodeproj │ ├── project.pbxproj │ ├── project.xcworkspace │ │ └── contents.xcworkspacedata │ └── xcshareddata │ │ └── xcschemes │ │ └── Runner.xcscheme ├── Runner.xcworkspace │ └── contents.xcworkspacedata └── Runner │ ├── AppDelegate.h │ ├── AppDelegate.m │ ├── Assets.xcassets │ ├── AppIcon.appiconset │ │ ├── Contents.json │ │ ├── Icon-App-1024x1024@1x.png │ │ ├── Icon-App-20x20@1x.png │ │ ├── Icon-App-20x20@2x.png │ │ ├── Icon-App-20x20@3x.png │ │ ├── Icon-App-29x29@1x.png │ │ ├── Icon-App-29x29@2x.png │ │ ├── Icon-App-29x29@3x.png │ │ ├── Icon-App-40x40@1x.png │ │ ├── Icon-App-40x40@2x.png │ │ ├── Icon-App-40x40@3x.png │ │ ├── Icon-App-60x60@2x.png │ │ ├── Icon-App-60x60@3x.png │ │ ├── Icon-App-76x76@1x.png │ │ ├── Icon-App-76x76@2x.png │ │ └── Icon-App-83.5x83.5@2x.png │ └── LaunchImage.imageset │ │ ├── Contents.json │ │ ├── LaunchImage.png │ │ ├── LaunchImage@2x.png │ │ ├── LaunchImage@3x.png │ │ └── README.md │ ├── Base.lproj │ ├── LaunchScreen.storyboard │ └── Main.storyboard │ ├── Info.plist │ └── main.m ├── lib ├── appbar_gradient.dart └── main.dart ├── pubspec.lock ├── pubspec.yaml └── test └── widget_test.dart /.gitignore: -------------------------------------------------------------------------------- 1 | # Miscellaneous 2 | *.class 3 | *.log 4 | *.pyc 5 | *.swp 6 | .DS_Store 7 | .atom/ 8 | .buildlog/ 9 | .history 10 | .svn/ 11 | 12 | # IntelliJ related 13 | *.iml 14 | *.ipr 15 | *.iws 16 | .idea/ 17 | 18 | # Visual Studio Code related 19 | .vscode/ 20 | 21 | # Flutter/Dart/Pub related 22 | **/doc/api/ 23 | .dart_tool/ 24 | .flutter-plugins 25 | .packages 26 | .pub-cache/ 27 | .pub/ 28 | /build/ 29 | 30 | # Android related 31 | **/android/**/gradle-wrapper.jar 32 | **/android/.gradle 33 | **/android/captures/ 34 | **/android/gradlew 35 | **/android/gradlew.bat 36 | **/android/local.properties 37 | **/android/**/GeneratedPluginRegistrant.java 38 | 39 | # iOS/XCode related 40 | **/ios/**/*.mode1v3 41 | **/ios/**/*.mode2v3 42 | **/ios/**/*.moved-aside 43 | **/ios/**/*.pbxuser 44 | **/ios/**/*.perspectivev3 45 | **/ios/**/*sync/ 46 | **/ios/**/.sconsign.dblite 47 | **/ios/**/.tags* 48 | **/ios/**/.vagrant/ 49 | **/ios/**/DerivedData/ 50 | **/ios/**/Icon? 51 | **/ios/**/Pods/ 52 | **/ios/**/.symlinks/ 53 | **/ios/**/profile 54 | **/ios/**/xcuserdata 55 | **/ios/.generated/ 56 | **/ios/Flutter/App.framework 57 | **/ios/Flutter/Flutter.framework 58 | **/ios/Flutter/Generated.xcconfig 59 | **/ios/Flutter/app.flx 60 | **/ios/Flutter/app.zip 61 | **/ios/Flutter/flutter_assets/ 62 | **/ios/ServiceDefinitions.json 63 | **/ios/Runner/GeneratedPluginRegistrant.* 64 | 65 | # Exceptions to above rules. 66 | !**/ios/**/default.mode1v3 67 | !**/ios/**/default.mode2v3 68 | !**/ios/**/default.pbxuser 69 | !**/ios/**/default.perspectivev3 70 | !/packages/flutter_tools/test/data/dart_dependencies_test/**/.packages 71 | -------------------------------------------------------------------------------- /.metadata: -------------------------------------------------------------------------------- 1 | # This file tracks properties of this Flutter project. 2 | # Used by Flutter tool to assess capabilities and perform upgrades etc. 3 | # 4 | # This file should be version controlled and should not be manually edited. 5 | 6 | version: 7 | revision: 8661d8aecd626f7f57ccbcb735553edc05a2e713 8 | channel: stable 9 | 10 | project_type: app 11 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | ## Flutter 来定义一个渐变色的 AppBar（源码分析） 2 | 3 | ## 写在前面 4 | 实现渐变色 AppBar 最简单的办法是: 5 | ``` 6 | flexibleSpace: Container( 7 | decoration: BoxDecoration( 8 | gradient: LinearGradient( 9 | colors: [Colors.cyan, Colors.blue, Colors.blueAccent], 10 | ), 11 | ), 12 | ), 13 | ``` 14 | 如果只是简单的渐变色需求，直接使用即可。 15 | 笔者的思路是flexibleSpace单独处理关于AppBar尺寸变动的情况，就像AppBar源码中对flexibleSpace的注释，A flexible space isn't actually flexible unless the [AppBar]'s container changes the [AppBar]'s size. A [SliverAppBar] in a [CustomScrollView] changes the [AppBar]'s height when scrolled. 16 | 后面有折叠效果，也方便扩展。 17 | 18 | ## 问题 19 | 20 | 最近项目组决定使用 Flutter 来做新的App，在开发过程中遇到了这样的一个需求，渐变色的AppBar。 21 | 22 | 就是这样的，类似于 QQ ，iOS首页AppBar，Android中几乎所有的AppBar: 23 | 24 | ![]() 25 | 26 | 27 | 28 | 像 Flutter 这样强大的 UI 库，先看一下AppBar的属性。 29 | 30 | 31 | ```dart 32 | AppBar({ 33 | Key key, 34 | this.leading, 35 | this.automaticallyImplyLeading = true, 36 | this.title, 37 | this.actions, 38 | this.flexibleSpace, 39 | this.bottom, 40 | this.elevation, 41 | this.backgroundColor, 42 | this.brightness, 43 | this.iconTheme, 44 | this.textTheme, 45 | this.primary = true, 46 | this.centerTitle, 47 | this.titleSpacing = NavigationToolbar.kMiddleSpacing, 48 | this.toolbarOpacity = 1.0, 49 | this.bottomOpacity = 1.0, 50 | }) : assert(automaticallyImplyLeading != null), 51 | assert(elevation == null || elevation >= 0.0), 52 | assert(primary != null), 53 | assert(titleSpacing != null), 54 | assert(toolbarOpacity != null), 55 | assert(bottomOpacity != null), 56 | preferredSize = Size.fromHeight(kToolbarHeight + (bottom?.preferredSize?.height ?? 0.0)), 57 | super(key: key); 58 | ``` 59 | 60 | 61 | 62 | 有个 backgroundColor 属性， 63 | 64 | 65 | ```dart 66 | final Color backgroundColor; 67 | ``` 68 | 69 | 凉凉，Color 类型。接下来，看一下网上帖子给的方案。 70 | 71 | How to add gradient color in AppBar in flutter 72 | 73 | [https://stackoverflow.com/questions/50412484/how-to-add-gradient-color-in-appbar-in-flutter](https://stackoverflow.com/questions/50412484/how-to-add-gradient-color-in-appbar-in-flutter) 74 | 75 | 大体思路就是继承一个 PreferredSize 类，内部通过 Container + decoration 实现自己需要的效果。（在 Scaffold 类中 appBar 参数需要一个 PreferredSize 类型的对象） 76 | 77 | 文章中的代码这里贴出来 78 | 79 | 80 | 81 | ```dart 82 | Widget build(BuildContext context) { 83 | return new Scaffold( 84 | appBar: new PreferredSize( 85 | child: new Container( 86 | padding: new EdgeInsets.only( 87 | top: MediaQuery.of(context).padding.top 88 | ), 89 | child: new Padding( 90 | padding: const EdgeInsets.only( 91 | left: 30.0, 92 | top: 20.0, 93 | bottom: 20.0 94 | ), 95 | child: new Text( 96 | 'Arnold Parge', 97 | style: new TextStyle( 98 | fontSize: 20.0, 99 | fontWeight: FontWeight.w500, 100 | color: Colors.white 101 | ), 102 | ), 103 | ), 104 | decoration: new BoxDecoration( 105 | gradient: new LinearGradient( 106 | colors: [ 107 | Colors.red, 108 | Colors.yellow 109 | ] 110 | ), 111 | boxShadow: [ 112 | new BoxShadow( 113 | color: Colors.grey[500], 114 | blurRadius: 20.0, 115 | spreadRadius: 1.0, 116 | ) 117 | ] 118 | ), 119 | ), 120 | preferredSize: new Size( 121 | MediaQuery.of(context).size.width, 122 | 150.0 123 | ), 124 | ), 125 | body: new Center( 126 | child: new Text('Hello'), 127 | ), 128 | ); 129 | } 130 | ``` 131 | 132 | 效果不是很满意，我还是想用AppBar中的特性啊，leading ，title 还是很好用的。那我们就自己来实现一个吧。 133 | 134 | 135 | 136 | ## AppBar内部实现 137 | 138 | ```dart 139 | class AppBar extends StatefulWidget implements PreferredSizeWidget 140 | ``` 141 | 142 | Appbar 继承了 StatefulWidget 实现了 PreferredSizeWidget ，所以我们直接看它的 State -> _AppBarState 。 143 | 144 | 直接去看 build 方法的返回，从后向前，看 AppBar 是如何实现的。 145 | 146 | ```dart 147 | @override 148 | Widget build(BuildContext context) { 149 | // 省略部分代码，后面来看 150 | ... 151 | 152 | final Brightness brightness = widget.brightness 153 | ?? appBarTheme.brightness 154 | ?? themeData.primaryColorBrightness; 155 | final SystemUiOverlayStyle overlayStyle = brightness == Brightness.dark 156 | ? SystemUiOverlayStyle.light 157 | : SystemUiOverlayStyle.dark; 158 | 159 | return Semantics( // 辅助功能相关 160 | container: true, 161 | child: AnnotatedRegion( // 处理主题相关，状态栏文字颜色 162 | value: overlayStyle, 163 | child: Material( // Material 控件，处理颜色，阴影等效果 164 | color: widget.backgroundColor 165 | ?? appBarTheme.color 166 | ?? themeData.primaryColor, 167 | elevation: widget.elevation 168 | ?? appBarTheme.elevation 169 | ?? _defaultElevation, 170 | child: Semantics( // child里面才是真正的内容，我们看内部的appBar的实现。 171 | explicitChildNodes: true, 172 | child: appBar, 173 | ), 174 | ), 175 | ), 176 | ); 177 | } 178 | ``` 179 | 180 | 返回了一个控件，处理了明暗主题，颜色，阴影，子控件，这里我们不想用这个颜色，再通过查看 child 能否设置颜色。 181 | 182 | 这里的 appBar 是在上面定义的： 183 | 184 | ```Dart 185 | Widget appBar = ClipRect( // 用矩形剪辑其子widget 186 | child: CustomSingleChildLayout( // 通过deleagate 来约束子widget 187 | delegate: const _ToolbarContainerLayout(), // 这里的布局是一个宽充满，高度为kkToolbarHeight高度 188 | child: IconTheme.merge( // 处理IconTheme 189 | data: appBarIconTheme,// 通过判断，处理iconTheme的取值 190 | child: DefaultTextStyle( // 文字样式 191 | style: sideStyle, // 通过判断传入的textTheme处理style取值 192 | child: toolbar, 193 | ), 194 | ), 195 | ), 196 | ); 197 | ``` 198 | 199 | 这里可以看到，这里就是包装了一个 toolbar ，我们继续看 toolbar ： 200 | 201 | ```dart 202 | // 这里是一个NavigationToolbar，我们设置的leading，title在这里使用 203 | final Widget toolbar = NavigationToolbar( 204 | leading: leading, 205 | middle: title, 206 | trailing: actions, 207 | centerMiddle: widget._getEffectiveCenterTitle(themeData), 208 | middleSpacing: widget.titleSpacing, 209 | ); 210 | ``` 211 | 212 | 关于 appBar 内部还进行一些处理，如处理 bottom ，增加 SafeArea 等处理，这里不做展开了 213 | 214 | ```dart 215 | if (widget.bottom != null) { // bottom 216 | appBar = Column( 217 | mainAxisAlignment: MainAxisAlignment.spaceBetween, 218 | children: [ 219 | Flexible( 220 | child: ConstrainedBox( 221 | constraints: const BoxConstraints(maxHeight: kToolbarHeight), 222 | child: appBar, 223 | ), 224 | ), 225 | widget.bottomOpacity == 1.0 ? widget.bottom : Opacity( 226 | opacity: const Interval(0.25, 1.0, curve: Curves.fastOutSlowIn).transform(widget.bottomOpacity), 227 | child: widget.bottom, 228 | ), 229 | ], 230 | ); 231 | } 232 | 233 | // The padding applies to the toolbar and tabbar, not the flexible space. 234 | if (widget.primary) { // SafeArea 235 | appBar = SafeArea( 236 | top: true, 237 | child: appBar, 238 | ); 239 | } 240 | 241 | appBar = Align( // Alignment.topCenter 242 | alignment: Alignment.topCenter, 243 | child: appBar, 244 | ); 245 | 246 | if (widget.flexibleSpace != null) { // flexibleSpace效果 247 | appBar = Stack( 248 | fit: StackFit.passthrough, 249 | children: [ 250 | widget.flexibleSpace, 251 | appBar, 252 | ], 253 | ); 254 | } 255 | ``` 256 | 257 | 通过这里我们知道了，其实 AppBar 中，颜色是在 Material 中设置的，我们常用的设置是在 toolbar 中进行使用的，所以最简单的渐变色处理方式就是将 Material 的child 包一层做颜色处理，不去修改现有部分。 258 | 259 | ## 代码实现 260 | 261 | 代码很简单，将AppBar的代码拷贝出来进行修改，这里的类名为GradientAppBar。 262 | 263 | 在自定义的 GradientAppBar 的构造方法中增加渐变颜色的初始值，和终止值。 264 | 265 | ```dart 266 | GradientAppBar({ 267 | ... 268 | this.gradientStart, 269 | this.gradientEnd, 270 | }) : assert(automaticallyImplyLeading != null), 271 | ... 272 | super(key: key); 273 | 274 | final Color gradientStart; 275 | final Color gradientEnd; 276 | ``` 277 | 278 | 再将 _AppBarState 类的代码拷贝出来，这里的类名是 _GradientAppBarState （记得修改 createState 方法）。 279 | 280 | 然后在修改对 build 方法 return 中 child 进行包装，使用传入的颜色作为渐变色背景。 281 | 282 | ```dart 283 | // 添加到build方法最后，return之前，通过使用decoration实现颜色的渐变 284 | if (widget.gradientStart != null && widget.gradientEnd != null) { 285 | appBar = Container( 286 | decoration: BoxDecoration( 287 | gradient: LinearGradient( 288 | colors: [widget.gradientStart, widget.gradientEnd]), 289 | ), 290 | child: appBar, 291 | ); 292 | } 293 | ``` 294 | 295 | 再进行处理 Material 的 颜色 296 | 297 | ```dart 298 | return Material( 299 | // 判断是否使用渐变色 300 | color: widget.gradientStart != null && widget.gradientEnd != null 301 | ? Colors.transparent 302 | : widget.backgroundColor ?? 303 | appBarTheme.color ?? 304 | themeData.primaryColor, 305 | elevation: widget.elevation ?? appBarTheme.elevation ?? _defaultElevation, 306 | child: appBar, // 使用包装后的appBar 307 | ); 308 | ``` 309 | 310 | 这样就实现了渐变效果。 311 | 312 | 使用 GradientAppBar ，就是将原来使用 AppBar 替换为 GradientAppBar 。 313 | 314 | ```dart 315 | return Scaffold( 316 | appBar: PreferredSize( 317 | child: GradientAppBar( 318 | gradientStart: Color(0xFF49A2FC), 319 | gradientEnd: Color(0xFF2171F5), 320 | title: Text(widget.title), 321 | leading: Icon(Icons.ac_unit), 322 | ), 323 | preferredSize: Size.fromHeight(400), 324 | ), 325 | body: Center( 326 | child: Column( 327 | mainAxisAlignment: MainAxisAlignment.center, 328 | children: [ 329 | Text( 330 | 'You have pushed the button this many times:', 331 | ), 332 | Text( 333 | '$_counter', 334 | style: Theme.of(context).textTheme.display1, 335 | ), 336 | ], 337 | ), 338 | ), 339 | floatingActionButton: FloatingActionButton( 340 | onPressed: _incrementCounter, 341 | tooltip: 'Increment', 342 | child: Icon(Icons.add), 343 | ), // This trailing comma makes auto-formatting nicer for build methods. 344 | ); 345 | ``` 346 | 347 | 效果图： 348 | 349 | ![]() 350 | 351 | 352 | 353 | 项目源码: [https://github.com/loosaSH/flutter-appbar](https://github.com/loosaSH/flutter-appbar) 354 | 355 | 356 | 357 | 358 | 359 | 360 | 361 | -------------------------------------------------------------------------------- /android/app/build.gradle: -------------------------------------------------------------------------------- 1 | def localProperties = new Properties() 2 | def localPropertiesFile = rootProject.file('local.properties') 3 | if (localPropertiesFile.exists()) { 4 | localPropertiesFile.withReader('UTF-8') { reader -> 5 | localProperties.load(reader) 6 | } 7 | } 8 | 9 | def flutterRoot = localProperties.getProperty('flutter.sdk') 10 | if (flutterRoot == null) { 11 | throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.") 12 | } 13 | 14 | def flutterVersionCode = localProperties.getProperty('flutter.versionCode') 15 | if (flutterVersionCode == null) { 16 | flutterVersionCode = '1' 17 | } 18 | 19 | def flutterVersionName = localProperties.getProperty('flutter.versionName') 20 | if (flutterVersionName == null) { 21 | flutterVersionName = '1.0' 22 | } 23 | 24 | apply plugin: 'com.android.application' 25 | apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle" 26 | 27 | android { 28 | compileSdkVersion 28 29 | 30 | lintOptions { 31 | disable 'InvalidPackage' 32 | } 33 | 34 | defaultConfig { 35 | // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html). 36 | applicationId "com.example.appbar_gradient" 37 | minSdkVersion 16 38 | targetSdkVersion 28 39 | versionCode flutterVersionCode.toInteger() 40 | versionName flutterVersionName 41 | testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" 42 | } 43 | 44 | buildTypes { 45 | release { 46 | // TODO: Add your own signing config for the release build. 47 | // Signing with the debug keys for now, so `flutter run --release` works. 48 | signingConfig signingConfigs.debug 49 | } 50 | } 51 | } 52 | 53 | flutter { 54 | source '../..' 55 | } 56 | 57 | dependencies { 58 | testImplementation 'junit:junit:4.12' 59 | androidTestImplementation 'com.android.support.test:runner:1.0.2' 60 | androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2' 61 | } 62 | -------------------------------------------------------------------------------- /android/app/src/debug/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 3 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /android/app/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 3 | 4 | 9 | 13 | 20 | 24 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | -------------------------------------------------------------------------------- /android/app/src/main/java/com/example/appbar_gradient/MainActivity.java: -------------------------------------------------------------------------------- 1 | package com.example.appbar_gradient; 2 | 3 | import android.os.Bundle; 4 | import io.flutter.app.FlutterActivity; 5 | import io.flutter.plugins.GeneratedPluginRegistrant; 6 | 7 | public class MainActivity extends FlutterActivity { 8 | @Override 9 | protected void onCreate(Bundle savedInstanceState) { 10 | super.onCreate(savedInstanceState); 11 | GeneratedPluginRegistrant.registerWith(this); 12 | } 13 | } 14 | -------------------------------------------------------------------------------- /android/app/src/main/res/drawable/launch_background.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 12 | 13 | -------------------------------------------------------------------------------- /android/app/src/main/res/mipmap-hdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/loosaSH/flutter-appbar/e544dc2862d37ff5c96e59f81a2361c7c8574de2/android/app/src/main/res/mipmap-hdpi/ic_launcher.png -------------------------------------------------------------------------------- /android/app/src/main/res/mipmap-mdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/loosaSH/flutter-appbar/e544dc2862d37ff5c96e59f81a2361c7c8574de2/android/app/src/main/res/mipmap-mdpi/ic_launcher.png -------------------------------------------------------------------------------- /android/app/src/main/res/mipmap-xhdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/loosaSH/flutter-appbar/e544dc2862d37ff5c96e59f81a2361c7c8574de2/android/app/src/main/res/mipmap-xhdpi/ic_launcher.png -------------------------------------------------------------------------------- /android/app/src/main/res/mipmap-xxhdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/loosaSH/flutter-appbar/e544dc2862d37ff5c96e59f81a2361c7c8574de2/android/app/src/main/res/mipmap-xxhdpi/ic_launcher.png -------------------------------------------------------------------------------- /android/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/loosaSH/flutter-appbar/e544dc2862d37ff5c96e59f81a2361c7c8574de2/android/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png -------------------------------------------------------------------------------- /android/app/src/main/res/values/styles.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 8 | 9 | -------------------------------------------------------------------------------- /android/app/src/profile/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 3 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /android/build.gradle: -------------------------------------------------------------------------------- 1 | buildscript { 2 | repositories { 3 | google() 4 | jcenter() 5 | } 6 | 7 | dependencies { 8 | classpath 'com.android.tools.build:gradle:3.2.1' 9 | } 10 | } 11 | 12 | allprojects { 13 | repositories { 14 | google() 15 | jcenter() 16 | } 17 | } 18 | 19 | rootProject.buildDir = '../build' 20 | subprojects { 21 | project.buildDir = "${rootProject.buildDir}/${project.name}" 22 | } 23 | subprojects { 24 | project.evaluationDependsOn(':app') 25 | } 26 | 27 | task clean(type: Delete) { 28 | delete rootProject.buildDir 29 | } 30 | -------------------------------------------------------------------------------- /android/gradle.properties: -------------------------------------------------------------------------------- 1 | org.gradle.jvmargs=-Xmx1536M 2 | -------------------------------------------------------------------------------- /android/gradle/wrapper/gradle-wrapper.properties: -------------------------------------------------------------------------------- 1 | #Fri Jun 23 08:50:38 CEST 2017 2 | distributionBase=GRADLE_USER_HOME 3 | distributionPath=wrapper/dists 4 | zipStoreBase=GRADLE_USER_HOME 5 | zipStorePath=wrapper/dists 6 | distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.2-all.zip 7 | -------------------------------------------------------------------------------- /android/settings.gradle: -------------------------------------------------------------------------------- 1 | include ':app' 2 | 3 | def flutterProjectRoot = rootProject.projectDir.parentFile.toPath() 4 | 5 | def plugins = new Properties() 6 | def pluginsFile = new File(flutterProjectRoot.toFile(), '.flutter-plugins') 7 | if (pluginsFile.exists()) { 8 | pluginsFile.withReader('UTF-8') { reader -> plugins.load(reader) } 9 | } 10 | 11 | plugins.each { name, path -> 12 | def pluginDirectory = flutterProjectRoot.resolve(path).resolve('android').toFile() 13 | include ":$name" 14 | project(":$name").projectDir = pluginDirectory 15 | } 16 | -------------------------------------------------------------------------------- /ios/Flutter/AppFrameworkInfo.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | CFBundleDevelopmentRegion 6 | en 7 | CFBundleExecutable 8 | App 9 | CFBundleIdentifier 10 | io.flutter.flutter.app 11 | CFBundleInfoDictionaryVersion 12 | 6.0 13 | CFBundleName 14 | App 15 | CFBundlePackageType 16 | FMWK 17 | CFBundleShortVersionString 18 | 1.0 19 | CFBundleSignature 20 | ???? 21 | CFBundleVersion 22 | 1.0 23 | MinimumOSVersion 24 | 8.0 25 | 26 | 27 | -------------------------------------------------------------------------------- /ios/Flutter/Debug.xcconfig: -------------------------------------------------------------------------------- 1 | #include "Generated.xcconfig" 2 | -------------------------------------------------------------------------------- /ios/Flutter/Release.xcconfig: -------------------------------------------------------------------------------- 1 | #include "Generated.xcconfig" 2 | -------------------------------------------------------------------------------- /ios/Runner.xcodeproj/project.pbxproj: -------------------------------------------------------------------------------- 1 | // !$*UTF8*$! 2 | { 3 | archiveVersion = 1; 4 | classes = { 5 | }; 6 | objectVersion 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/ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata: -------------------------------------------------------------------------------- 1 | 2 | 4 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme: -------------------------------------------------------------------------------- 1 | 2 | 5 | 8 | 9 | 15 | 21 | 22 | 23 | 24 | 25 | 31 | 32 | 33 | 34 | 40 | 41 | 42 | 43 | 44 | 45 | 56 | 58 | 64 | 65 | 66 | 67 | 68 | 69 | 75 | 77 | 83 | 84 | 85 | 86 | 88 | 89 | 92 | 93 | 94 | -------------------------------------------------------------------------------- /ios/Runner.xcworkspace/contents.xcworkspacedata: -------------------------------------------------------------------------------- 1 | 2 | 4 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /ios/Runner/AppDelegate.h: -------------------------------------------------------------------------------- 1 | #import 2 | #import 3 | 4 | @interface AppDelegate : FlutterAppDelegate 5 | 6 | @end 7 | -------------------------------------------------------------------------------- /ios/Runner/AppDelegate.m: -------------------------------------------------------------------------------- 1 | #include "AppDelegate.h" 2 | #include "GeneratedPluginRegistrant.h" 3 | 4 | @implementation AppDelegate 5 | 6 | - (BOOL)application:(UIApplication *)application 7 | didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 8 | [GeneratedPluginRegistrant registerWithRegistry:self]; 9 | // Override point for customization after application launch. 10 | return [super application:application didFinishLaunchingWithOptions:launchOptions]; 11 | } 12 | 13 | @end 14 | -------------------------------------------------------------------------------- /ios/Runner/Assets.xcassets/AppIcon.appiconset/Contents.json: -------------------------------------------------------------------------------- 1 | { 2 | "images" : [ 3 | { 4 | "size" : "20x20", 5 | "idiom" : "iphone", 6 | "filename" : "Icon-App-20x20@2x.png", 7 | "scale" : "2x" 8 | }, 9 | { 10 | "size" : "20x20", 11 | "idiom" : "iphone", 12 | "filename" : "Icon-App-20x20@3x.png", 13 | "scale" : "3x" 14 | }, 15 | { 16 | "size" : "29x29", 17 | "idiom" : "iphone", 18 | "filename" : "Icon-App-29x29@1x.png", 19 | "scale" : "1x" 20 | }, 21 | { 22 | "size" : "29x29", 23 | "idiom" : "iphone", 24 | "filename" : "Icon-App-29x29@2x.png", 25 | "scale" : "2x" 26 | }, 27 | { 28 | "size" : "29x29", 29 | "idiom" : "iphone", 30 | "filename" : "Icon-App-29x29@3x.png", 31 | "scale" : "3x" 32 | }, 33 | { 34 | "size" : "40x40", 35 | "idiom" : "iphone", 36 | "filename" : "Icon-App-40x40@2x.png", 37 | "scale" : "2x" 38 | }, 39 | { 40 | "size" : "40x40", 41 | "idiom" : "iphone", 42 | "filename" : "Icon-App-40x40@3x.png", 43 | "scale" : "3x" 44 | }, 45 | { 46 | "size" : "60x60", 47 | "idiom" : "iphone", 48 | "filename" : "Icon-App-60x60@2x.png", 49 | "scale" : "2x" 50 | }, 51 | { 52 | "size" : "60x60", 53 | "idiom" : "iphone", 54 | "filename" : "Icon-App-60x60@3x.png", 55 | "scale" : "3x" 56 | }, 57 | { 58 | "size" : "20x20", 59 | "idiom" : "ipad", 60 | "filename" : "Icon-App-20x20@1x.png", 61 | "scale" : "1x" 62 | }, 63 | { 64 | "size" : "20x20", 65 | "idiom" : "ipad", 66 | "filename" : "Icon-App-20x20@2x.png", 67 | "scale" : "2x" 68 | }, 69 | { 70 | "size" : "29x29", 71 | "idiom" : "ipad", 72 | "filename" : "Icon-App-29x29@1x.png", 73 | "scale" : "1x" 74 | }, 75 | { 76 | "size" : "29x29", 77 | "idiom" : "ipad", 78 | "filename" : "Icon-App-29x29@2x.png", 79 | "scale" : "2x" 80 | }, 81 | { 82 | "size" : "40x40", 83 | "idiom" : "ipad", 84 | "filename" : "Icon-App-40x40@1x.png", 85 | "scale" : "1x" 86 | }, 87 | { 88 | "size" : "40x40", 89 | "idiom" : "ipad", 90 | "filename" : "Icon-App-40x40@2x.png", 91 | "scale" : "2x" 92 | }, 93 | { 94 | "size" : "76x76", 95 | "idiom" : "ipad", 96 | "filename" : "Icon-App-76x76@1x.png", 97 | "scale" : "1x" 98 | }, 99 | { 100 | "size" : "76x76", 101 | "idiom" : "ipad", 102 | "filename" : "Icon-App-76x76@2x.png", 103 | "scale" : "2x" 104 | }, 105 | { 106 | "size" : "83.5x83.5", 107 | "idiom" : "ipad", 108 | "filename" : "Icon-App-83.5x83.5@2x.png", 109 | "scale" : "2x" 110 | }, 111 | { 112 | "size" : "1024x1024", 113 | "idiom" : "ios-marketing", 114 | "filename" : "Icon-App-1024x1024@1x.png", 115 | "scale" : "1x" 116 | } 117 | ], 118 | "info" : { 119 | "version" : 1, 120 | "author" : "xcode" 121 | } 122 | } 123 | -------------------------------------------------------------------------------- /ios/Runner/Assets.xcassets/AppIcon.appiconset/Icon-App-1024x1024@1x.png: -------------------------------------------------------------------------------- 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https://raw.githubusercontent.com/loosaSH/flutter-appbar/e544dc2862d37ff5c96e59f81a2361c7c8574de2/ios/Runner/Assets.xcassets/LaunchImage.imageset/LaunchImage@3x.png -------------------------------------------------------------------------------- /ios/Runner/Assets.xcassets/LaunchImage.imageset/README.md: -------------------------------------------------------------------------------- 1 | # Launch Screen Assets 2 | 3 | You can customize the launch screen with your own desired assets by replacing the image files in this directory. 4 | 5 | You can also do it by opening your Flutter project's Xcode project with `open ios/Runner.xcworkspace`, selecting `Runner/Assets.xcassets` in the Project Navigator and dropping in the desired images. -------------------------------------------------------------------------------- /ios/Runner/Base.lproj/LaunchScreen.storyboard: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | -------------------------------------------------------------------------------- /ios/Runner/Base.lproj/Main.storyboard: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | -------------------------------------------------------------------------------- /ios/Runner/Info.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | CFBundleDevelopmentRegion 6 | en 7 | CFBundleExecutable 8 | $(EXECUTABLE_NAME) 9 | CFBundleIdentifier 10 | $(PRODUCT_BUNDLE_IDENTIFIER) 11 | CFBundleInfoDictionaryVersion 12 | 6.0 13 | CFBundleName 14 | appbar_gradient 15 | CFBundlePackageType 16 | APPL 17 | CFBundleShortVersionString 18 | $(FLUTTER_BUILD_NAME) 19 | CFBundleSignature 20 | ???? 21 | CFBundleVersion 22 | $(FLUTTER_BUILD_NUMBER) 23 | LSRequiresIPhoneOS 24 | 25 | UILaunchStoryboardName 26 | LaunchScreen 27 | UIMainStoryboardFile 28 | Main 29 | UISupportedInterfaceOrientations 30 | 31 | UIInterfaceOrientationPortrait 32 | UIInterfaceOrientationLandscapeLeft 33 | UIInterfaceOrientationLandscapeRight 34 | 35 | UISupportedInterfaceOrientations~ipad 36 | 37 | UIInterfaceOrientationPortrait 38 | UIInterfaceOrientationPortraitUpsideDown 39 | UIInterfaceOrientationLandscapeLeft 40 | UIInterfaceOrientationLandscapeRight 41 | 42 | UIViewControllerBasedStatusBarAppearance 43 | 44 | 45 | 46 | -------------------------------------------------------------------------------- /ios/Runner/main.m: -------------------------------------------------------------------------------- 1 | #import 2 | #import 3 | #import "AppDelegate.h" 4 | 5 | int main(int argc, char* argv[]) { 6 | @autoreleasepool { 7 | return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class])); 8 | } 9 | } 10 | -------------------------------------------------------------------------------- /lib/appbar_gradient.dart: -------------------------------------------------------------------------------- 1 | import 'package:flutter/material.dart'; 2 | 3 | import 'package:flutter/foundation.dart'; 4 | import 'package:flutter/services.dart'; 5 | 6 | const double _kLeadingWidth = 7 | kToolbarHeight; // So the leading button is square. 8 | 9 | class GradientAppBar extends StatefulWidget implements PreferredSizeWidget { 10 | GradientAppBar({ 11 | Key key, 12 | this.leading, 13 | this.automaticallyImplyLeading = true, 14 | this.title, 15 | this.actions, 16 | this.flexibleSpace, 17 | this.bottom, 18 | this.elevation, 19 | this.backgroundColor, 20 | this.brightness, 21 | this.iconTheme, 22 | this.textTheme, 23 | this.primary = true, 24 | this.centerTitle, 25 | this.titleSpacing = NavigationToolbar.kMiddleSpacing, 26 | this.toolbarOpacity = 1.0, 27 | this.bottomOpacity = 1.0, 28 | this.gradientStart, 29 | this.gradientEnd, 30 | }) : assert(automaticallyImplyLeading != null), 31 | assert(elevation == null || elevation >= 0.0), 32 | assert(primary != null), 33 | assert(titleSpacing != null), 34 | assert(toolbarOpacity != null), 35 | assert(bottomOpacity != null), 36 | preferredSize = Size.fromHeight( 37 | kToolbarHeight + (bottom?.preferredSize?.height ?? 0.0)), 38 | super(key: key); 39 | 40 | final Widget leading; 41 | final bool automaticallyImplyLeading; 42 | final Widget title; 43 | final List actions; 44 | final Widget flexibleSpace; 45 | final PreferredSizeWidget bottom; 46 | final double elevation; 47 | final Color backgroundColor; 48 | final Brightness brightness; 49 | final IconThemeData iconTheme; 50 | final TextTheme textTheme; 51 | final bool primary; 52 | final bool centerTitle; 53 | final double titleSpacing; 54 | final double toolbarOpacity; 55 | final double bottomOpacity; 56 | 57 | final Color gradientStart; 58 | final Color gradientEnd; 59 | 60 | @override 61 | final Size preferredSize; 62 | 63 | bool _getEffectiveCenterTitle(ThemeData themeData) { 64 | if (centerTitle != null) return centerTitle; 65 | assert(themeData.platform != null); 66 | switch (themeData.platform) { 67 | case TargetPlatform.android: 68 | case TargetPlatform.fuchsia: 69 | return false; 70 | case TargetPlatform.iOS: 71 | return actions == null || actions.length < 2; 72 | } 73 | return null; 74 | } 75 | 76 | @override 77 | _GradientAppBarState createState() => _GradientAppBarState(); 78 | } 79 | 80 | class _GradientAppBarState extends State { 81 | static const double _defaultElevation = 4.0; 82 | 83 | void _handleDrawerButton() { 84 | Scaffold.of(context).openDrawer(); 85 | } 86 | 87 | void _handleDrawerButtonEnd() { 88 | Scaffold.of(context).openEndDrawer(); 89 | } 90 | 91 | @override 92 | Widget build(BuildContext context) { 93 | final ThemeData themeData = Theme.of(context); 94 | final AppBarTheme appBarTheme = AppBarTheme.of(context); 95 | final ScaffoldState scaffold = Scaffold.of(context, nullOk: true); 96 | final ModalRoute parentRoute = ModalRoute.of(context); 97 | 98 | final bool hasDrawer = scaffold?.hasDrawer ?? false; 99 | final bool hasEndDrawer = scaffold?.hasEndDrawer ?? false; 100 | final bool canPop = parentRoute?.canPop ?? false; 101 | final bool useCloseButton = 102 | parentRoute is PageRoute && parentRoute.fullscreenDialog; 103 | 104 | IconThemeData appBarIconTheme = 105 | widget.iconTheme ?? appBarTheme.iconTheme ?? themeData.primaryIconTheme; 106 | TextStyle centerStyle = widget.textTheme?.title ?? 107 | appBarTheme.textTheme?.title ?? 108 | themeData.primaryTextTheme.title; 109 | TextStyle sideStyle = widget.textTheme?.body1 ?? 110 | appBarTheme.textTheme?.body1 ?? 111 | themeData.primaryTextTheme.body1; 112 | 113 | Widget leading = widget.leading; 114 | if (leading == null && widget.automaticallyImplyLeading) { 115 | if (hasDrawer) { 116 | leading = IconButton( 117 | icon: const Icon(Icons.menu), 118 | onPressed: _handleDrawerButton, 119 | tooltip: MaterialLocalizations.of(context).openAppDrawerTooltip, 120 | ); 121 | } else { 122 | if (canPop) 123 | leading = useCloseButton ? const CloseButton() : const BackButton(); 124 | } 125 | } 126 | if (leading != null) { 127 | leading = ConstrainedBox( 128 | constraints: const BoxConstraints.tightFor(width: _kLeadingWidth), 129 | child: leading, 130 | ); 131 | } 132 | 133 | Widget title = widget.title; 134 | if (title != null) { 135 | bool namesRoute; 136 | switch (defaultTargetPlatform) { 137 | case TargetPlatform.android: 138 | case TargetPlatform.fuchsia: 139 | namesRoute = true; 140 | break; 141 | case TargetPlatform.iOS: 142 | break; 143 | } 144 | title = DefaultTextStyle( 145 | style: centerStyle, 146 | softWrap: false, 147 | overflow: TextOverflow.ellipsis, 148 | child: Semantics( 149 | namesRoute: namesRoute, 150 | child: title, 151 | header: true, 152 | ), 153 | ); 154 | } 155 | 156 | Widget actions; 157 | if (widget.actions != null && widget.actions.isNotEmpty) { 158 | actions = Row( 159 | mainAxisSize: MainAxisSize.min, 160 | crossAxisAlignment: CrossAxisAlignment.stretch, 161 | children: widget.actions, 162 | ); 163 | } else if (hasEndDrawer) { 164 | actions = IconButton( 165 | icon: const Icon(Icons.menu), 166 | onPressed: _handleDrawerButtonEnd, 167 | tooltip: MaterialLocalizations.of(context).openAppDrawerTooltip, 168 | ); 169 | } 170 | 171 | final Widget toolbar = NavigationToolbar( 172 | leading: leading, 173 | middle: title, 174 | trailing: actions, 175 | centerMiddle: widget._getEffectiveCenterTitle(themeData), 176 | middleSpacing: widget.titleSpacing, 177 | ); 178 | 179 | Widget appBar = ClipRect( 180 | child: CustomSingleChildLayout( 181 | delegate: const _ToolbarContainerLayout(), 182 | child: IconTheme.merge( 183 | data: appBarIconTheme, 184 | child: DefaultTextStyle( 185 | style: sideStyle, 186 | child: toolbar, 187 | ), 188 | ), 189 | ), 190 | ); 191 | if (widget.bottom != null) { 192 | appBar = Column( 193 | mainAxisAlignment: MainAxisAlignment.spaceBetween, 194 | children: [ 195 | Flexible( 196 | child: ConstrainedBox( 197 | constraints: const BoxConstraints(maxHeight: kToolbarHeight), 198 | child: appBar, 199 | ), 200 | ), 201 | widget.bottomOpacity == 1.0 202 | ? widget.bottom 203 | : Opacity( 204 | opacity: 205 | const Interval(0.25, 1.0, curve: Curves.fastOutSlowIn) 206 | .transform(widget.bottomOpacity), 207 | child: widget.bottom, 208 | ), 209 | ], 210 | ); 211 | } 212 | 213 | if (widget.primary) { 214 | appBar = SafeArea( 215 | top: true, 216 | child: appBar, 217 | ); 218 | } 219 | 220 | appBar = Align( 221 | alignment: Alignment.topCenter, 222 | child: appBar, 223 | ); 224 | 225 | if (widget.flexibleSpace != null) { 226 | appBar = Stack( 227 | fit: StackFit.passthrough, 228 | children: [ 229 | widget.flexibleSpace, 230 | appBar, 231 | ], 232 | ); 233 | } 234 | 235 | if (widget.gradientStart != null && widget.gradientEnd != null) { 236 | appBar = Container( 237 | decoration: BoxDecoration( 238 | gradient: LinearGradient( 239 | colors: [widget.gradientStart, widget.gradientEnd]), 240 | ), 241 | child: appBar, 242 | ); 243 | } 244 | 245 | final Brightness brightness = widget.brightness ?? 246 | appBarTheme.brightness ?? 247 | themeData.primaryColorBrightness; 248 | final SystemUiOverlayStyle overlayStyle = brightness == Brightness.dark 249 | ? SystemUiOverlayStyle.light 250 | : SystemUiOverlayStyle.dark; 251 | 252 | return Material( 253 | color: widget.gradientStart != null && widget.gradientEnd != null 254 | ? Colors.transparent 255 | : widget.backgroundColor ?? 256 | appBarTheme.color ?? 257 | themeData.primaryColor, 258 | elevation: widget.elevation ?? appBarTheme.elevation ?? _defaultElevation, 259 | child: appBar, 260 | ); 261 | } 262 | } 263 | 264 | class _ToolbarContainerLayout extends SingleChildLayoutDelegate { 265 | const _ToolbarContainerLayout(); 266 | 267 | @override 268 | BoxConstraints getConstraintsForChild(BoxConstraints constraints) { 269 | return constraints.tighten(height: kToolbarHeight); 270 | } 271 | 272 | @override 273 | Size getSize(BoxConstraints constraints) { 274 | return Size(constraints.maxWidth, kToolbarHeight); 275 | } 276 | 277 | @override 278 | Offset getPositionForChild(Size size, Size childSize) { 279 | return Offset(0.0, size.height - childSize.height); 280 | } 281 | 282 | @override 283 | bool shouldRelayout(_ToolbarContainerLayout oldDelegate) => false; 284 | } 285 | -------------------------------------------------------------------------------- /lib/main.dart: -------------------------------------------------------------------------------- 1 | import 'package:flutter/material.dart'; 2 | import 'package:appbar_gradient/appbar_gradient.dart'; 3 | 4 | void main() => runApp(MyApp()); 5 | 6 | class MyApp extends StatelessWidget { 7 | // This widget is the root of your application. 8 | @override 9 | Widget build(BuildContext context) { 10 | return MaterialApp( 11 | title: 'Flutter Demo', 12 | theme: ThemeData( 13 | // This is the theme of your application. 14 | // 15 | // Try running your application with "flutter run". You'll see the 16 | // application has a blue toolbar. Then, without quitting the app, try 17 | // changing the primarySwatch below to Colors.green and then invoke 18 | // "hot reload" (press "r" in the console where you ran "flutter run", 19 | // or simply save your changes to "hot reload" in a Flutter IDE). 20 | // Notice that the counter didn't reset back to zero; the application 21 | // is not restarted. 22 | primarySwatch: Colors.blue, 23 | ), 24 | home: MyHomePage(title: 'Flutter Demo Home Page'), 25 | ); 26 | } 27 | } 28 | 29 | class MyHomePage extends StatefulWidget { 30 | MyHomePage({Key key, this.title}) : super(key: key); 31 | 32 | // This widget is the home page of your application. It is stateful, meaning 33 | // that it has a State object (defined below) that contains fields that affect 34 | // how it looks. 35 | 36 | // This class is the configuration for the state. It holds the values (in this 37 | // case the title) provided by the parent (in this case the App widget) and 38 | // used by the build method of the State. Fields in a Widget subclass are 39 | // always marked "final". 40 | 41 | final String title; 42 | 43 | @override 44 | _MyHomePageState createState() => _MyHomePageState(); 45 | } 46 | 47 | class _MyHomePageState extends State { 48 | int _counter = 0; 49 | 50 | void _incrementCounter() { 51 | setState(() { 52 | // This call to setState tells the Flutter framework that something has 53 | // changed in this State, which causes it to rerun the build method below 54 | // so that the display can reflect the updated values. If we changed 55 | // _counter without calling setState(), then the build method would not be 56 | // called again, and so nothing would appear to happen. 57 | _counter++; 58 | }); 59 | } 60 | 61 | @override 62 | Widget build(BuildContext context) { 63 | // This method is rerun every time setState is called, for instance as done 64 | // by the _incrementCounter method above. 65 | // 66 | // The Flutter framework has been optimized to make rerunning build methods 67 | // fast, so that you can just rebuild anything that needs updating rather 68 | // than having to individually change instances of widgets. 69 | return Scaffold( 70 | appBar: GradientAppBar( 71 | // Here we take the value from the MyHomePage object that was created by 72 | // the App.build method, and use it to set our appbar title. 73 | gradientStart: Color(0xFF2171F5), 74 | gradientEnd: Color(0xFF49A2FC), 75 | title: Text(widget.title), 76 | leading: Icon(Icons.ac_unit), 77 | ), 78 | body: Center( 79 | // Center is a layout widget. It takes a single child and positions it 80 | // in the middle of the parent. 81 | child: Column( 82 | // Column is also layout widget. It takes a list of children and 83 | // arranges them vertically. By default, it sizes itself to fit its 84 | // children horizontally, and tries to be as tall as its parent. 85 | // 86 | // Invoke "debug painting" (press "p" in the console, choose the 87 | // "Toggle Debug Paint" action from the Flutter Inspector in Android 88 | // Studio, or the "Toggle Debug Paint" command in Visual Studio Code) 89 | // to see the wireframe for each widget. 90 | // 91 | // Column has various properties to control how it sizes itself and 92 | // how it positions its children. Here we use mainAxisAlignment to 93 | // center the children vertically; the main axis here is the vertical 94 | // axis because Columns are vertical (the cross axis would be 95 | // horizontal). 96 | mainAxisAlignment: MainAxisAlignment.center, 97 | children: [ 98 | Text( 99 | 'You have pushed the button this many times:', 100 | ), 101 | Text( 102 | '$_counter', 103 | style: Theme.of(context).textTheme.display1, 104 | ), 105 | ], 106 | ), 107 | ), 108 | floatingActionButton: FloatingActionButton( 109 | onPressed: _incrementCounter, 110 | tooltip: 'Increment', 111 | child: Icon(Icons.add), 112 | ), // This trailing comma makes auto-formatting nicer for build methods. 113 | ); 114 | } 115 | } 116 | -------------------------------------------------------------------------------- /pubspec.lock: -------------------------------------------------------------------------------- 1 | # Generated by pub 2 | # See https://www.dartlang.org/tools/pub/glossary#lockfile 3 | packages: 4 | async: 5 | dependency: transitive 6 | description: 7 | name: async 8 | url: "https://pub.dartlang.org" 9 | source: hosted 10 | version: "2.0.8" 11 | boolean_selector: 12 | dependency: transitive 13 | description: 14 | name: boolean_selector 15 | url: "https://pub.dartlang.org" 16 | source: hosted 17 | version: "1.0.4" 18 | charcode: 19 | dependency: transitive 20 | description: 21 | name: charcode 22 | url: "https://pub.dartlang.org" 23 | source: hosted 24 | version: "1.1.2" 25 | collection: 26 | dependency: transitive 27 | description: 28 | name: collection 29 | url: "https://pub.dartlang.org" 30 | source: hosted 31 | version: "1.14.11" 32 | cupertino_icons: 33 | dependency: "direct main" 34 | description: 35 | name: cupertino_icons 36 | url: "https://pub.dartlang.org" 37 | source: hosted 38 | version: "0.1.2" 39 | flutter: 40 | dependency: "direct main" 41 | description: flutter 42 | source: sdk 43 | version: "0.0.0" 44 | flutter_test: 45 | dependency: "direct dev" 46 | description: flutter 47 | source: sdk 48 | version: "0.0.0" 49 | matcher: 50 | dependency: transitive 51 | description: 52 | name: matcher 53 | url: "https://pub.dartlang.org" 54 | source: hosted 55 | version: "0.12.3+1" 56 | meta: 57 | dependency: transitive 58 | description: 59 | name: meta 60 | url: "https://pub.dartlang.org" 61 | source: hosted 62 | version: "1.1.6" 63 | path: 64 | dependency: transitive 65 | description: 66 | name: path 67 | url: "https://pub.dartlang.org" 68 | source: hosted 69 | version: "1.6.2" 70 | pedantic: 71 | dependency: transitive 72 | description: 73 | name: pedantic 74 | url: "https://pub.dartlang.org" 75 | source: hosted 76 | version: "1.4.0" 77 | quiver: 78 | dependency: transitive 79 | description: 80 | name: quiver 81 | url: "https://pub.dartlang.org" 82 | source: hosted 83 | version: "2.0.1" 84 | sky_engine: 85 | dependency: transitive 86 | description: flutter 87 | source: sdk 88 | version: "0.0.99" 89 | source_span: 90 | dependency: transitive 91 | description: 92 | name: source_span 93 | url: "https://pub.dartlang.org" 94 | source: hosted 95 | version: "1.5.4" 96 | stack_trace: 97 | dependency: transitive 98 | description: 99 | name: stack_trace 100 | url: "https://pub.dartlang.org" 101 | source: hosted 102 | version: "1.9.3" 103 | stream_channel: 104 | dependency: transitive 105 | description: 106 | name: stream_channel 107 | url: "https://pub.dartlang.org" 108 | source: hosted 109 | version: "1.6.8" 110 | string_scanner: 111 | dependency: transitive 112 | description: 113 | name: string_scanner 114 | url: "https://pub.dartlang.org" 115 | source: hosted 116 | version: "1.0.4" 117 | term_glyph: 118 | dependency: transitive 119 | description: 120 | name: term_glyph 121 | url: "https://pub.dartlang.org" 122 | source: hosted 123 | version: "1.1.0" 124 | test_api: 125 | dependency: transitive 126 | description: 127 | name: test_api 128 | url: "https://pub.dartlang.org" 129 | source: hosted 130 | version: "0.2.2" 131 | typed_data: 132 | dependency: transitive 133 | description: 134 | name: typed_data 135 | url: "https://pub.dartlang.org" 136 | source: hosted 137 | version: "1.1.6" 138 | vector_math: 139 | dependency: transitive 140 | description: 141 | name: vector_math 142 | url: "https://pub.dartlang.org" 143 | source: hosted 144 | version: "2.0.8" 145 | sdks: 146 | dart: ">=2.1.0 <3.0.0" 147 | -------------------------------------------------------------------------------- /pubspec.yaml: -------------------------------------------------------------------------------- 1 | name: appbar_gradient 2 | description: A new Flutter project. 3 | 4 | # The following defines the version and build number for your application. 5 | # A version number is three numbers separated by dots, like 1.2.43 6 | # followed by an optional build number separated by a +. 7 | # Both the version and the builder number may be overridden in flutter 8 | # build by specifying --build-name and --build-number, respectively. 9 | # In Android, build-name is used as versionName while build-number used as versionCode. 10 | # Read more about Android versioning at https://developer.android.com/studio/publish/versioning 11 | # In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion. 12 | # Read more about iOS versioning at 13 | # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html 14 | version: 1.0.0+1 15 | 16 | environment: 17 | sdk: ">=2.1.0 <3.0.0" 18 | 19 | dependencies: 20 | flutter: 21 | sdk: flutter 22 | 23 | # The following adds the Cupertino Icons font to your application. 24 | # Use with the CupertinoIcons class for iOS style icons. 25 | cupertino_icons: ^0.1.2 26 | 27 | dev_dependencies: 28 | flutter_test: 29 | sdk: flutter 30 | 31 | 32 | # For information on the generic Dart part of this file, see the 33 | # following page: https://www.dartlang.org/tools/pub/pubspec 34 | 35 | # The following section is specific to Flutter. 36 | flutter: 37 | 38 | # The following line ensures that the Material Icons font is 39 | # included with your application, so that you can use the icons in 40 | # the material Icons class. 41 | uses-material-design: true 42 | 43 | # To add assets to your application, add an assets section, like this: 44 | # assets: 45 | # - images/a_dot_burr.jpeg 46 | # - images/a_dot_ham.jpeg 47 | 48 | # An image asset can refer to one or more resolution-specific "variants", see 49 | # https://flutter.io/assets-and-images/#resolution-aware. 50 | 51 | # For details regarding adding assets from package dependencies, see 52 | # https://flutter.io/assets-and-images/#from-packages 53 | 54 | # To add custom fonts to your application, add a fonts section here, 55 | # in this "flutter" section. Each entry in this list should have a 56 | # "family" key with the font family name, and a "fonts" key with a 57 | # list giving the asset and other descriptors for the font. For 58 | # example: 59 | # fonts: 60 | # - family: Schyler 61 | # fonts: 62 | # - asset: fonts/Schyler-Regular.ttf 63 | # - asset: fonts/Schyler-Italic.ttf 64 | # style: italic 65 | # - family: Trajan Pro 66 | # fonts: 67 | # - asset: fonts/TrajanPro.ttf 68 | # - asset: fonts/TrajanPro_Bold.ttf 69 | # weight: 700 70 | # 71 | # For details regarding fonts from package dependencies, 72 | # see https://flutter.io/custom-fonts/#from-packages 73 | -------------------------------------------------------------------------------- /test/widget_test.dart: -------------------------------------------------------------------------------- 1 | // This is a basic Flutter widget test. 2 | // 3 | // To perform an interaction with a widget in your test, use the WidgetTester 4 | // utility that Flutter provides. For example, you can send tap and scroll 5 | // gestures. You can also use WidgetTester to find child widgets in the widget 6 | // tree, read text, and verify that the values of widget properties are correct. 7 | 8 | import 'package:flutter/material.dart'; 9 | import 'package:flutter_test/flutter_test.dart'; 10 | 11 | import 'package:appbar_gradient/main.dart'; 12 | 13 | void main() { 14 | testWidgets('Counter increments smoke test', (WidgetTester tester) async { 15 | // Build our app and trigger a frame. 16 | await tester.pumpWidget(MyApp()); 17 | 18 | // Verify that our counter starts at 0. 19 | expect(find.text('0'), findsOneWidget); 20 | expect(find.text('1'), findsNothing); 21 | 22 | // Tap the '+' icon and trigger a frame. 23 | await tester.tap(find.byIcon(Icons.add)); 24 | await tester.pump(); 25 | 26 | // Verify that our counter has incremented. 27 | expect(find.text('0'), findsNothing); 28 | expect(find.text('1'), findsOneWidget); 29 | }); 30 | } 31 | --------------------------------------------------------------------------------