public NavigationRailTheme(
Key key = null,
NavigationRailThemeData data = null,
Widget child = null
) : base(key: key, child: child)
{
D.assert(data != null);
this.data = data;
}
public override Widget build(BuildContext context)
{
ThemeData theme = Theme.of(context);
NavigationRailThemeData navigationRailTheme = NavigationRailTheme.of(context);
MaterialLocalizations localizations = MaterialLocalizations.of(context);
Color backgroundColor =
widget.backgroundColor ?? navigationRailTheme.backgroundColor ?? theme.colorScheme.surface;
float elevation = widget.elevation ?? navigationRailTheme.elevation ?? 0;
float minWidth = widget.minWidth ?? material_._minRailWidth;
float minExtendedWidth = widget.minExtendedWidth ?? material_._minExtendedRailWidth;
Color baseSelectedColor = theme.colorScheme.primary;
Color baseColor = theme.colorScheme.onSurface.withOpacity(0.64f);
IconThemeData defaultUnselectedIconTheme =
widget.unselectedIconTheme ?? navigationRailTheme.unselectedIconTheme;
IconThemeData unselectedIconTheme = new IconThemeData(
size: defaultUnselectedIconTheme?.size ?? 24.0f,
color: defaultUnselectedIconTheme?.color ?? theme.colorScheme.onSurface,
opacity: defaultUnselectedIconTheme?.opacity ?? 1.0f
);
IconThemeData defaultSelectedIconTheme = widget.selectedIconTheme ?? navigationRailTheme.selectedIconTheme;
IconThemeData selectedIconTheme = new IconThemeData(
size: defaultSelectedIconTheme?.size ?? 24.0f,
color: defaultSelectedIconTheme?.color ?? theme.colorScheme.primary,
opacity: defaultSelectedIconTheme?.opacity ?? 0.64f
);
TextStyle unselectedLabelTextStyle = theme.textTheme.bodyText1.copyWith(color: baseColor)
.merge(widget.unselectedLabelTextStyle ?? navigationRailTheme.unselectedLabelTextStyle);
TextStyle selectedLabelTextStyle = theme.textTheme.bodyText1.copyWith(color: baseSelectedColor)
.merge(widget.selectedLabelTextStyle ?? navigationRailTheme.selectedLabelTextStyle);
float groupAlignment = widget.groupAlignment ?? navigationRailTheme.groupAlignment ?? -1.0f;
NavigationRailLabelType labelType =
widget.labelType ?? navigationRailTheme.labelType ?? NavigationRailLabelType.none;
var materialChildren = new List <Widget>();
materialChildren.Add(material_._verticalSpacer);
if (widget.leading != null)
{
materialChildren.AddRange(new List <Widget>()
{
new ConstrainedBox(
constraints: new BoxConstraints(
minWidth: MathUtils.lerpNullableFloat(minWidth, minExtendedWidth, _extendedAnimation.value)
),
child: widget.leading
),
material_._verticalSpacer,
});
}
var alignChildren = new List <Widget>();
for (int i = 0; i < widget.destinations.Count; i += 1)
{
alignChildren.Add(new _RailDestination(
minWidth: minWidth,
minExtendedWidth: minExtendedWidth,
extendedTransitionAnimation: _extendedAnimation,
selected: widget.selectedIndex == i,
icon: widget.selectedIndex == i ? widget.destinations[i].selectedIcon : widget.destinations[i].icon,
label: widget.destinations[i].label,
destinationAnimation: _destinationAnimations[i],
labelType: labelType,
iconTheme: widget.selectedIndex == i ? selectedIconTheme : unselectedIconTheme,
labelTextStyle: widget.selectedIndex == i ? selectedLabelTextStyle : unselectedLabelTextStyle,
onTap: () => { widget.onDestinationSelected(i); },
indexLabel: localizations.tabLabel(
tabIndex: i + 1,
tabCount: widget.destinations.Count
)
));
}
if (widget.trailing != null)
{
alignChildren.Add(new ConstrainedBox(
constraints: new BoxConstraints(
minWidth: MathUtils.lerpNullableFloat(minWidth, minExtendedWidth, _extendedAnimation.value)
),
child: widget.trailing
));
}
materialChildren.Add(new Expanded(
child: new Align(
alignment: new Alignment(0, groupAlignment),
child: new Column(
mainAxisSize: MainAxisSize.min,
children: alignChildren
)
)
));
return(new _ExtendedNavigationRailAnimation(
animation: _extendedAnimation,
child: new Material(
elevation: elevation,
color: backgroundColor,
child: new Column(
children: materialChildren
)
)
));
}