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Body of the app
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@override | |
Widget build(BuildContext context) { | |
return Scaffold( | |
appBar: AppBar( | |
title: Text('Button Tabs (IOS Style)'), | |
), | |
backgroundColor: Colors.white, | |
body: Column(children: <Widget>[ | |
// this is the TabBar | |
Container( | |
height: 49.0, | |
// this generates our tabs buttons | |
child: ListView.builder( | |
// this gives the TabBar a bounce effect when scrolling farther than it's size | |
physics: BouncingScrollPhysics(), | |
controller: _scrollController, | |
// make the list horizontal | |
scrollDirection: Axis.horizontal, | |
// number of tabs | |
itemCount: _icons.length, | |
itemBuilder: (BuildContext context, int index) { | |
return Padding( | |
// each button's key | |
key: _keys[index], | |
// padding for the buttons | |
padding: EdgeInsets.all(6.0), | |
child: ButtonTheme( | |
child: AnimatedBuilder( | |
animation: _colorTweenBackgroundOn, | |
builder: (context, child) => FlatButton( | |
// get the color of the button's background (dependent of its state) | |
color: _getBackgroundColor(index), | |
// make the button a rectangle with round corners | |
shape: RoundedRectangleBorder( | |
borderRadius: new BorderRadius.circular(7.0)), | |
onPressed: () { | |
setState(() { | |
_buttonTap = true; | |
// trigger the controller to change between Tab Views | |
_controller.animateTo(index); | |
// set the current index | |
_setCurrentIndex(index); | |
// scroll to the tapped button (needed if we tap the active button and it's not on its position) | |
_scrollTo(index); | |
}); | |
}, | |
child: Icon( | |
// get the icon | |
_icons[index], | |
// get the color of the icon (dependent of its state) | |
color: _getForegroundColor(index), | |
)), | |
))); | |
})), | |
Flexible( | |
// this will host our Tab Views | |
child: TabBarView( | |
// and it is controlled by the controller | |
controller: _controller, | |
children: <Widget>[ | |
// our Tab Views | |
Icon(_icons[0]), | |
Icon(_icons[1]), | |
Icon(_icons[2]), | |
Icon(_icons[3]), | |
Icon(_icons[4]), | |
Icon(_icons[5]) | |
], | |
)), | |
])); | |
} | |
... | |
_getBackgroundColor(int index) { | |
if (index == _currentIndex) { | |
// if it's active button | |
return _colorTweenBackgroundOn.value; | |
} else if (index == _prevControllerIndex) { | |
// if it's the previous active button | |
return _colorTweenBackgroundOff.value; | |
} else { | |
// if the button is inactive | |
return _backgroundOff; | |
} | |
} | |
_getForegroundColor(int index) { | |
// the same as the above | |
if (index == _currentIndex) { | |
return _colorTweenForegroundOn.value; | |
} else if (index == _prevControllerIndex) { | |
return _colorTweenForegroundOff.value; | |
} else { | |
return _foregroundOff; | |
} | |
} |
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