public override Widget build(BuildContext context)
{
List <MergeableMaterialItem> items = new List <MergeableMaterialItem>();
EdgeInsets kExpandedEdgeInsets = EdgeInsets.symmetric(
vertical: ExpansionPanelUtils._kPanelHeaderExpandedHeight -
ExpansionPanelUtils._kPanelHeaderCollapsedHeight);
for (int index = 0; index < this.widget.children.Count; index++)
{
int expandIndex = index;
if (this._isChildExpanded(index) && index != 0 && !this._isChildExpanded(index - 1))
{
items.Add(new MaterialGap(
key: new _SaltedKey <BuildContext, int>(context, index * 2 - 1)));
}
ExpansionPanel child = this.widget.children[index];
Row header = new Row(
children: new List <Widget> {
new Expanded(
child: new AnimatedContainer(
duration: this.widget.animationDuration,
curve: Curves.fastOutSlowIn,
margin: this._isChildExpanded(index) ? kExpandedEdgeInsets : EdgeInsets.zero,
child: new ConstrainedBox(
constraints: new BoxConstraints(
minHeight: ExpansionPanelUtils._kPanelHeaderCollapsedHeight),
child: child.headerBuilder(
context,
this._isChildExpanded(index))
)
)
),
new Container(
margin: EdgeInsets.fromLTRB(0, 0, 8, 0),
child: new ExpandIcon(
isExpanded: this._isChildExpanded(index),
padding: EdgeInsets.all(16.0),
onPressed: (bool isExpanded) => this._handlePressed(isExpanded, expandIndex)
)
)
}
);
items.Add(new MaterialSlice(
key: new _SaltedKey <BuildContext, int>(context, index * 2),
child: new Column(
children: new List <Widget> {
header,
new AnimatedCrossFade(
firstChild: new Container(height: 0.0),
secondChild: child.body,
firstCurve: new Interval(0.0, 0.6, curve: Curves.fastOutSlowIn),
secondCurve: new Interval(0.4, 1.0, curve: Curves.fastOutSlowIn),
sizeCurve: Curves.fastOutSlowIn,
crossFadeState: this._isChildExpanded(index)
? CrossFadeState.showSecond
: CrossFadeState.showFirst,
duration: this.widget.animationDuration
)
}
)
)
);
if (this._isChildExpanded(index) && index != this.widget.children.Count - 1)
{
items.Add(new MaterialGap(
key: new _SaltedKey <BuildContext, int>(context, index * 2 + 1)));
}
}
return(new MergeableMaterial(
hasDividers: true,
children: items));
}
public override Widget build(BuildContext context)
{
List <MergeableMaterialItem> items = new List <MergeableMaterialItem>();
for (int i = 0; i < widget.children.Count; i++)
{
int expandIndex = i;
if (_isChildExpanded(expandIndex) && expandIndex != 0 && !_isChildExpanded(expandIndex - 1))
{
items.Add(new MaterialGap(
key: new _SaltedKey <BuildContext, int>(context, expandIndex * 2 - 1)));
}
ExpansionPanel child = widget.children[expandIndex];
Widget headerWidget = child.headerBuilder(
context,
_isChildExpanded(expandIndex)
);
Widget expandIconContainer = new Container(
margin: EdgeInsetsDirectional.only(end: 8.0f),
child: new ExpandIcon(
isExpanded: _isChildExpanded(expandIndex),
padding: EdgeInsets.all(16.0f),
onPressed: !child.canTapOnHeader
? (bool isExpanded) => _handlePressed(isExpanded, expandIndex)
: (ValueChanged <bool>)null
)
);
Widget header = new Row(
children: new List <Widget> {
new Expanded(
child: new AnimatedContainer(
duration: widget.animationDuration,
curve: Curves.fastOutSlowIn,
margin: _isChildExpanded(expandIndex) ? widget.expandedHeaderPadding : EdgeInsets.zero,
child: new ConstrainedBox(
constraints: new BoxConstraints(
minHeight: material_._kPanelHeaderCollapsedHeight),
child: headerWidget
)
)
),
expandIconContainer,
}
);
if (child.canTapOnHeader)
{
header = new InkWell(
onTap: () => _handlePressed(_isChildExpanded(expandIndex), expandIndex),
child: header
);
}
items.Add(new MaterialSlice(
key: new _SaltedKey <BuildContext, int>(context, expandIndex * 2),
child: new Column(
children: new List <Widget> {
header,
new AnimatedCrossFade(
firstChild: new Container(height: 0.0f),
secondChild: child.body,
firstCurve: new Interval(0.0f, 0.6f, curve: Curves.fastOutSlowIn),
secondCurve: new Interval(0.4f, 1.0f, curve: Curves.fastOutSlowIn),
sizeCurve: Curves.fastOutSlowIn,
crossFadeState: _isChildExpanded(expandIndex)
? CrossFadeState.showSecond
: CrossFadeState.showFirst,
duration: widget.animationDuration
)
}
)
)
);
if (_isChildExpanded(expandIndex) && expandIndex != widget.children.Count - 1)
{
items.Add(new MaterialGap(
key: new _SaltedKey <BuildContext, int>(context, expandIndex * 2 + 1)));
}
}
return(new MergeableMaterial(
hasDividers: true,
children: items));
}
