public override Widget build(BuildContext context)
{
Color fixColor = this.color ?? Colors.transparent;
Color fixSelectedColor = this.selectedColor ?? Theme.of(context).accentColor;
ColorTween selectedColorTween = new ColorTween(begin: fixColor, end: fixSelectedColor);
ColorTween previousColorTween = new ColorTween(begin: fixSelectedColor, end: fixColor);
TabController tabController = this.controller ?? DefaultTabController.of(context);
D.assert(() => {
if (tabController == null)
{
throw new UIWidgetsError(
"No TabController for " + this.GetType() + ".\n" +
"When creating a " + this.GetType() + ", you must either provide an explicit TabController " +
"using the \"controller\" property, or you must ensure that there is a " +
"DefaultTabController above the " + this.GetType() + ".\n" +
"In this case, there was neither an explicit controller nor a default controller."
);
}
return(true);
});
Animation <float> animation = new CurvedAnimation(
parent: tabController.animation,
curve: Curves.fastOutSlowIn
);
return(new AnimatedBuilder(
animation: animation,
builder: (BuildContext subContext, Widget child) => {
List <Widget> children = new List <Widget>();
for (int tabIndex = 0; tabIndex < tabController.length; tabIndex++)
{
children.Add(this._buildTabIndicator(
tabIndex,
tabController,
selectedColorTween,
previousColorTween)
);
}
return new Row(
mainAxisSize: MainAxisSize.min,
children: children
);
}
));
}
void _updateTabController()
{
TabController newController = this.widget.controller ?? DefaultTabController.of(this.context);
D.assert(() => {
if (newController == null)
{
throw new UIWidgetsError(
"No TabController for " + this.widget.GetType() + ".\n" +
"When creating a " + this.widget.GetType() + ", you must either provide an explicit " +
"TabController using the \"controller\" property, or you must ensure that there " +
"is a DefaultTabController above the " + this.widget.GetType() + ".\n" +
"In this case, there was neither an explicit controller nor a default controller."
);
}
return(true);
});
if (newController == this._controller)
{
return;
}
if (this._controller != null)
{
this._controller.animation.removeListener(this._handleTabControllerAnimationTick);
this._controller.removeListener(this._handleTabControllerTick);
}
this._controller = newController;
if (this._controller != null)
{
this._controller.animation.addListener(this._handleTabControllerAnimationTick);
this._controller.addListener(this._handleTabControllerTick);
this._currentIndex = this._controller.index;
}
}