_allHeroesFor(BuildContext context, bool isUserGestureTransition, NavigatorState navigator)
{
D.assert(context != null);
D.assert(navigator != null);
Dictionary <object, _HeroState> result = new Dictionary <object, _HeroState> {
};
void addHero(StatefulElement hero, object tag)
{
D.assert(() => {
if (result.ContainsKey(tag))
{
throw new UIWidgetsError(
"There are multiple heroes that share the same tag within a subtree.\n" +
"Within each subtree for which heroes are to be animated (typically a PageRoute subtree), " +
"each Hero must have a unique non-null tag.\n" +
$"In this case, multiple heroes had the following tag: {tag}\n" +
"Here is the subtree for one of the offending heroes:\n" +
$"{hero.toStringDeep(prefixLineOne: "# ")}"
);
}
return(true);
});
_HeroState heroState = (_HeroState)hero.state;
result[tag] = heroState;
}
void visitor(Element element)
{
if (element.widget is Hero)
{
StatefulElement hero = (StatefulElement)element;
Hero heroWidget = (Hero)element.widget;
if (!isUserGestureTransition || heroWidget.transitionOnUserGestures)
{
object tag = heroWidget.tag;
D.assert(tag != null);
if (Navigator.of(hero) == navigator)
{
addHero(hero, tag);
}
else
{
ModalRoute heroRoute = ModalRoute.of(hero);
if (heroRoute != null && heroRoute is PageRoute && heroRoute.isCurrent)
{
addHero(hero, tag);
}
}
}
}
element.visitChildren(visitor);
}
context.visitChildElements(visitor);
return(result);
}
public static bool canPop(BuildContext context)
{
NavigatorState navigator = Navigator.of(context, nullOk: true);
return(navigator != null && navigator.canPop());
}
protected internal virtual void dispose()
{
this._navigator = null;
}
internal static Dictionary <object, _HeroState> _allHeroesFor(
BuildContext context,
bool isUserGestureTransition,
NavigatorState navigator)
{
D.assert(context != null);
D.assert(navigator != null);
Dictionary <object, _HeroState> result = new Dictionary <object, _HeroState> {
};
void inviteHero(StatefulElement hero, object tag)
{
D.assert(() => {
if (result.ContainsKey(tag))
{
throw new UIWidgetsError(
new List <DiagnosticsNode>()
{
new ErrorSummary("There are multiple heroes that share the same tag within a subtree."),
new ErrorDescription(
"Within each subtree for which heroes are to be animated (i.e. a PageRoute subtree), " +
"each Hero must have a unique non-null tag.\n" +
$"In this case, multiple heroes had the following tag: {tag}\n"
),
new DiagnosticsProperty <StatefulElement>("Here is the subtree for one of the offending heroes", hero, linePrefix: "# ", style: DiagnosticsTreeStyle.dense),
});
}
return(true);
});
Hero heroWidget = hero.widget as Hero;
_HeroState heroState = hero.state as _HeroState;
if (!isUserGestureTransition || heroWidget.transitionOnUserGestures)
{
result[tag] = heroState;
}
else
{
heroState.ensurePlaceholderIsHidden();
}
}
void visitor(Element element)
{
Widget widget = element.widget;
if (widget is Hero)
{
StatefulElement hero = element as StatefulElement;
object tag = ((Hero)widget).tag;
D.assert(tag != null);
if (Navigator.of(hero) == navigator)
{
inviteHero(hero, tag);
}
else
{
ModalRoute heroRoute = ModalRoute.of(hero);
if (heroRoute != null && heroRoute is PageRoute && heroRoute.isCurrent)
{
inviteHero(hero, tag);
}
}
}
element.visitChildren(visitor);
}
context.visitChildElements(visitor);
return(result);
}