public FadeTransition transition(BottomNavigationBarType type, BuildContext context)
{
Color iconColor;
if (type == BottomNavigationBarType.shifting)
{
iconColor = this._color;
}
else
{
ThemeData themeData = Theme.of(context);
iconColor = themeData.brightness == Brightness.light
? themeData.primaryColor
: themeData.accentColor;
}
return(new FadeTransition(
opacity: this._animation,
child: new SlideTransition(
position: this._animation.drive(
new OffsetTween(
begin: new Offset(0.0f, 0.02f), // Slightly down.
end: Offset.zero
)
),
child: new IconTheme(
data: new IconThemeData(
color: iconColor,
size: 120.0f
),
child: this._icon
)
)
));
}
public override Widget build(BuildContext context)
{
BottomNavigationBar botNavBar = new BottomNavigationBar(
items: this._navigationViews
.Select <NavigationIconView, BottomNavigationBarItem>((NavigationIconView navigationView) =>
navigationView.item)
.ToList(),
currentIndex: this._currentIndex,
type: this._type,
onTap: (int index) =>
{
this.setState(() =>
{
this._navigationViews[this._currentIndex].controller.reverse();
this._currentIndex = index;
this._navigationViews[this._currentIndex].controller.forward();
});
}
);
return(new Scaffold(
appBar: new AppBar(
title: new Text("Bottom navigation"),
actions: new List <Widget>
{
new MaterialDemoDocumentationButton(BottomNavigationDemo.routeName),
new PopupMenuButton <BottomNavigationBarType>(
onSelected: (BottomNavigationBarType value) =>
{
this.setState(() => { this._type = value; });
},
itemBuilder: (BuildContext subContext) => new List <PopupMenuEntry <BottomNavigationBarType> >
{
new PopupMenuItem <BottomNavigationBarType>(
value: BottomNavigationBarType.fix,
child: new Text("Fixed")
),
new PopupMenuItem <BottomNavigationBarType>(
value: BottomNavigationBarType.shifting,
child: new Text("Shifting")
)
}
)
}
),
body: new Center(
child: this._buildTransitionsStack()
),
bottomNavigationBar: botNavBar
));
}
static bool _defaultShowUnselected(BottomNavigationBarType type)
{
switch (type)
{
case BottomNavigationBarType.shifting:
return(false);
case BottomNavigationBarType.fix:
return(true);
}
D.assert(false);
return(false);
}
