Flutter Platform Widgets

Target the specific design of Material for Android and Cupertino for iOS widgets through a common set of Platform aware widgets.

This project is an attempt to see if it is possible to create widgets that are platform aware. Currently in order to render targted Android or iOS device specific styles, you need to either conditionaly check the platform or create a set of widgets to render differently depending on the running platform.

Widgets

These set of widgets allow for rendering based on the target platform using a single cross platform set of widget.

Each PlatformWidget provides common properties directly as constructor arguments. If required further customization can be achieved by using the platform widget builder. See the Enhance section of each widget.

PlatformWidget

A widget that will render either the android widget or cupertino widget based on the target platform. The widgets themselves do not need to be specifically Material or Cupertino.

return PlatformWidget(
  ios: (_) => Icon(CupertinoIcons.flag),
  android: (_) => Icon(Icons.flag),
);

Dart

PlatformText

A widget that will render uppercase for Android. iOS will remain unchanged.

return PlatformText('Cancel');  

Dart

PlatformButton

A button that will render a RaisedButton for android or a CupertinoButton for iOS.

return PlatformButton(
  onPressed: () => print('send'),
  child: PlatformText('Send'),
);

Dart

Enhance

Extend with WidgetBuilder for android or iOS.

return PlatformButton(
  onPressed: () => print('send'),
  child: PlatformText('Send'),
  android: (_) => MaterialRaisedButtonData(...),
  ios: (_) => CupertinoButtonData(...)
);

Dart

PlatformIconButton

A clickable (tappable) button with an icon. Uses IconButton for android or CupertinoButton for ios.

return PlatformIconButton(
  onPressed: () => print('info pressed'),
  iosIcon: Icon(
    CupertinoIcons.info,
    size: 28.0,
  ),
  androidIcon: Icon(Icons.info)
);

Dart

Enhance

Extend with WidgetBuilder for android or iOS.

Widget infoIconButton() {
  return PlatformIconButton(
    onPressed: () => print('info pressed'),
    iosIcon: Icon(CupertinoIcons.info),
    androidIcon: Icon(Icons.info),
    android: (_) => MaterialIconButtonData(...),
    ios: (_) => CupertinoIconButtonData(...),
  );
}

Dart

PlatformScaffold

A Scaffold that provides the correctly hosted header (AppBar) and navigation bar (Bottom Bar) for each platform. Uses Scaffold for android or CupertinoTabScaffold for ios with bottom tabs or CupertinoPageScaffold for ios without bottom tabs.

return PlatformScaffold(
  appBar: PlatformAppBar()
  body: _buildContent(),
  bottomNavBar: PlatformNavBar(),
  iosContentPadding: false
);

Dart

Note that the use of iosContentPadding = true is only required if the content is being obstruced behind the appBar

Enhance

Extend with WidgetBuilder for android or iOS.

return PlatformScaffold(
  appBar: PlatformAppBar()
  body: _buildContent(),
  bottomNavBar: PlatformNavBar(),
  android: (_) => MaterialScaffoldData(...)
  ios: (_) => CupertinoScaffoldData(...);
);

Dart

PlatformAppBar

The AppBar is the top Header bar with a title, leftside or rightside buttons. Uses AppBar for android or CupertinoNavigationBar for ios.

return PlatformAppBar(
    title: new Text('Platform Widgets'),
    leading: PlatformIconButton()),
    trailingActions: <Widget>[
      PlatformIconButton(),
    ],
  );

Dart

Enhance

Extend with WidgetBuilder for android or iOS.

return PlatformAppBar(
  title: new Text('Platform Widgets'),
  leading: PlatformIconButton()),
  trailingActions: <Widget>[
    PlatformIconButton(),
  ],
  android: (_) => MaterialAppBarData(...),
  ios: (_)=> CupertinoNavigationBarData(...),
);

Dart

PlatformNavBar

Note: hasNotch has been removed to allow for the widget to work with the change on the development branch of flutter. To work around the breaking change either use the Material BottomAppBar directly or cast the result from PlatformNavBar to BottomAppBar for android builds and set the hasNotch property. Otherwise target version 0.2.0

The NavBar is placed at the bottom of the page with a set of buttons that typically navigate between screens. Implementing this widget requires the parent widget to manage the currentIndex of the page and to set PlatformNavBar.currrentIndex. Uses BottomAppBar with BottomNavigationBar for android or CupertinoTabBar for ios.

return PlatformNavBar(
  currentIndex: _selectedTabIndex,
  itemChanged: (index) => setState(
        () {
          _selectedTabIndex = index;
        },
      ),
  items: [
    BottomNavigationBarItem(),
    BottomNavigationBarItem(),
  ],
);

Dart

Enhance

Extend with WidgetBuilder for android or iOS.

return PlatformNavBar(
  currentIndex: _selectedTabIndex,
  itemChanged: (index) => setState(
        () {
          _selectedTabIndex = index;
        },
      ),
  items: [
    BottomNavigationBarItem(),
    BottomNavigationBarItem(),
  ],
  android: (_) => MaterialNavBarData(...);
  ios: (_) => CupertinoTabBarData(...),
);

Dart

PlatformAlertDialog

The AlertDialog will render a caption/title, body/text and a set of action buttons specific for the platform. Uses AlertDialog for android or CupertinoAlertDialog for ios.

Note that showDialog from the material package needs to be used to make it easy to render.

showDialog(
  context: context,
  builder: (_) => PlatformAlertDialog(
    title: Text('Alert'),
    content: Text('Some content'),
    actions: <Widget>[
      PlatformDialogAction(),
      PlatformDialogAction(),
    ],
  ),
);

Dart

Enhance

Extend with WidgetBuilder for android or iOS.

showDialog(
  context: context,
  builder: (_) => PlatformAlertDialog(...);
  ios: (_) => CupertinoAlertDialogData(...),
  android: (_) => MaterialAlertDialogData(...),
)

Dart

PlatformDialogAction

The DialogAction widget is used to describe the set of buttons on the AlertDialog. Uses FlatButton for android or CupertinoDialogAction for ios.

PlatformDialogAction(
  child: PlatformText('Cancel'),
  onPressed: () => Navigator.pop(context),
),

Dart

Enhance

Extend with WidgetBuilder for android or iOS.

PlatformDialogAction(
  child: PlatformText('Cancel'),
  onPressed: () => Navigator.pop(context),
  android: (_) => MaterialDialogActionData(...),
  ios: (_) => CupertinoDialogActionData(...),
),

Dart

PlatformCircularProgressIndicator

A circular looking progress indicator. Uses CircularProgressIndicator for android or CupertinoActivityIndicator for ios.

return PlatformCircularProgressIndicator();

Dart

Enhance

Extend with WidgetBuilder for android or iOS.

return PlatformCircularProgressIndicator(
  android: (_) => MaterialProgressIndicatorData(...),
  ios: (_)=> CupertinoProgressIndicatorData(...),
);

Dart

TODO

  • UI / Unit Tests.
  • Code documentation

The following are a list more platform aware widgets needing to be added.

Changing / Checking Platform

When importing flutter_platform_widgets you can check isMaterial or isCupertino to determine what style will be used. This is independent to Platform.isAndroid or Platform.isIOS from 'import 'dart:io'

See the example code for how this is used.

Known Limitations

Best to set to fixed if the number of navigation items are 4 or more.

return PlatformNavBar(
   android: (_) => MaterialNavBarData(
      type: BottomNavigationBarType.fixed,
    ),

Dart

  • Setting BottomNavigationBar.fixedColor to anything has no effect.
  • If using the Cupertino widgets it may complain that there is no Material parent when using material widgets further doen the widget tree. If this is the case you need to place Material as a child widget
return PlatformScaffold(
  body: Material(
    color: Colors.white,
    child: _theBodyOfThePageWithMaterialWidgets(),
  );
);

Dart

Note: You may fine without setting the color of the Material widget there will be a slight grey color appear as the background. You may need to explicitly set the color to match the rest of the page

  • Cupertino widgets do not pick up the Theme in all cases. In particular the Text() widget needs to have a DefaultTheme set otherwise all Text() widgets need to have their style property set.
return DefaultTextStyle(
  style: Theme.of(context).textTheme.body1,
  child: Center(
     child: Column(
       children: <Widget>[
         PlatformText('Text 1'),
         PlatformText('Text 2'),
         PlatformText('Text 3'),
       ],
     ),
   ),
 );

Get This Source Code on GitHub: