_ChildEntry _newEntry(
Widget child,
AnimatedSwitcherTransitionBuilder builder,
AnimationController controller,
Animation <float> animation
)
{
_ChildEntry entry = new _ChildEntry(
widgetChild: child,
transition: KeyedSubtree.wrap(builder(child, animation), this._childNumber),
animation: animation,
controller: controller
);
animation.addStatusListener((AnimationStatus status) => {
if (status == AnimationStatus.dismissed)
{
this.setState(() => {
D.assert(this.mounted);
D.assert(this._outgoingEntries.Contains(entry));
this._outgoingEntries.Remove(entry);
this._markChildWidgetCacheAsDirty();
});
controller.dispose();
}
});
return(entry);
}
void _updateTransitionForEntry(_ChildEntry entry)
{
entry.transition = new KeyedSubtree(
key: entry.transition.key,
child: this.widget.transitionBuilder(entry.widgetChild, entry.animation)
);
}
void _addEntryForNewChild(bool animate)
{
D.assert(animate || _currentEntry == null);
if (_currentEntry != null)
{
D.assert(animate);
D.assert(!_outgoingEntries.Contains(_currentEntry));
_outgoingEntries.Add(_currentEntry);
_currentEntry.controller.reverse();
_markChildWidgetCacheAsDirty();
_currentEntry = null;
}
if (widget.child == null)
{
return;
}
AnimationController controller = new AnimationController(
duration: widget.duration,
reverseDuration: widget.reverseDuration,
vsync: this
);
Animation <float> animation = new CurvedAnimation(
parent: controller,
curve: widget.switchInCurve,
reverseCurve: widget.switchOutCurve
);
_currentEntry = _newEntry(
child: widget.child,
controller: controller,
animation: animation,
builder: widget.transitionBuilder
);
if (animate)
{
controller.forward();
}
else
{
D.assert(_outgoingEntries.isEmpty);
controller.setValue(1.0f);
}
}
