public override Widget build(BuildContext context)
{
D.assert(material_.debugCheckHasMaterial(context));
D.assert(material_.debugCheckHasMaterialLocalizations(context));
Orientation?newOrientation = _getOrientation(context);
_lastOrientation = _lastOrientation ?? newOrientation;
if (newOrientation != _lastOrientation)
{
_removeDropdownRoute();
_lastOrientation = newOrientation;
}
List <Widget> items = null;
if (_enabled)
{
items = widget.selectedItemBuilder == null
? new List <Widget>(widget.items)
: widget.selectedItemBuilder(context);
}
else
{
items = widget.selectedItemBuilder == null
? new List <Widget>()
: widget.selectedItemBuilder(context);
}
int hintIndex = 0;
if (widget.hint != null || (!_enabled && widget.disabledHint != null))
{
Widget displayedHint = _enabled ? widget.hint : widget.disabledHint ?? widget.hint;
if (widget.selectedItemBuilder == null)
{
displayedHint = new _DropdownMenuItemContainer(child: displayedHint);
}
hintIndex = items.Count;
items.Add(new DefaultTextStyle(
style: _textStyle.copyWith(color: Theme.of(context).hintColor),
child: new IgnorePointer(
child: displayedHint
)
));
}
EdgeInsetsGeometry padding = ButtonTheme.of(context).alignedDropdown
? material_._kAlignedButtonPadding
: material_._kUnalignedButtonPadding;
int index = _enabled ? (_selectedIndex ?? hintIndex) : hintIndex;
Widget innerItemsWidget = null;
if (items.isEmpty())
{
innerItemsWidget = new Container();
}
else
{
innerItemsWidget = new IndexedStack(
index: index,
alignment: AlignmentDirectional.centerStart,
children: widget.isDense
? items
: LinqUtils <Widget> .SelectList(items, (Widget item) => {
return(widget.itemHeight != null
? new SizedBox(height: widget.itemHeight, child: item)
: (Widget) new Column(mainAxisSize: MainAxisSize.min,
children: new List <Widget>()
{
item
}));
}));
}
Icon defaultIcon = new Icon(Icons.arrow_drop_down);
Widget result = new DefaultTextStyle(
style: _textStyle,
child: new Container(
decoration: _showHighlight ?? false
? new BoxDecoration(
color: widget.focusColor ?? Theme.of(context).focusColor,
borderRadius: BorderRadius.all(Radius.circular(4.0f))
)
: null,
padding: padding,
height: widget.isDense ? _denseButtonHeight : null,
child: new Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
mainAxisSize: MainAxisSize.min,
children: new List <Widget> {
widget.isExpanded ? new Expanded(child: innerItemsWidget) : (Widget)innerItemsWidget,
new IconTheme(
data: new IconThemeData(
color: _iconColor,
size: widget.iconSize
),
child: widget.icon ?? defaultIcon
)
}
)
)
);
if (!DropdownButtonHideUnderline.at(context))
{
float bottom = widget.isDense || widget.itemHeight == null ? 0.0f : 8.0f;
result = new Stack(
children: new List <Widget> {
result,
new Positioned(
left: 0.0f,
right: 0.0f,
bottom: bottom,
child: widget.underline ?? new Container(
height: 1.0f,
decoration: new BoxDecoration(
border: new Border(
bottom: new BorderSide(color: new Color(0xFFBDBDBD), width: 0.0f))
)
)
)
}
);
}
return(new Focus(
canRequestFocus: _enabled,
focusNode: focusNode,
autofocus: widget.autofocus,
child: new GestureDetector(
onTap: _enabled ? (GestureTapCallback)_handleTap : null,
behavior: HitTestBehavior.opaque,
child: result
)
));
}
public override Widget build(BuildContext context)
{
D.assert(MaterialD.debugCheckHasMaterial(context));
D.assert(MaterialD.debugCheckHasMaterialLocalizations(context));
List <Widget> items = this._enabled ? new List <Widget>(this.widget.items) : new List <Widget>();
int hintIndex = 0;
if (this.widget.hint != null || (!this._enabled && this.widget.disabledHint != null))
{
Widget emplacedHint =
this._enabled
? this.widget.hint
: new DropdownMenuItem <Widget>(child: this.widget.disabledHint ?? this.widget.hint);
hintIndex = items.Count;
items.Add(new DefaultTextStyle(
style: this._textStyle.copyWith(color: Theme.of(context).hintColor),
child: new IgnorePointer(
child: emplacedHint
)
));
}
EdgeInsets padding = ButtonTheme.of(context).alignedDropdown
? DropdownConstants._kAlignedButtonPadding
: DropdownConstants._kUnalignedButtonPadding;
IndexedStack innerItemsWidget = new IndexedStack(
index: this._enabled ? (this._selectedIndex ?? hintIndex) : hintIndex,
alignment: Alignment.centerLeft,
children: items
);
Widget result = new DefaultTextStyle(
style: this._textStyle,
child: new Container(
padding: padding,
height: this.widget.isDense ? this._denseButtonHeight : null,
child: new Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
mainAxisSize: MainAxisSize.min,
children: new List <Widget> {
this.widget.isExpanded ? new Expanded(child: innerItemsWidget) : (Widget)innerItemsWidget,
new Icon(Icons.arrow_drop_down,
size: this.widget.iconSize,
color: this._downArrowColor
)
}
)
)
);
if (!DropdownButtonHideUnderline.at(context))
{
float bottom = this.widget.isDense ? 0.0f : 8.0f;
result = new Stack(
children: new List <Widget> {
result,
new Positioned(
left: 0.0f,
right: 0.0f,
bottom: bottom,
child: new Container(
height: 1.0f,
decoration: new BoxDecoration(
border: new Border(
bottom: new BorderSide(color: new Color(0xFFBDBDBD), width: 0.0f))
)
)
)
}
);
}
return(new GestureDetector(
onTap: this._enabled ? (GestureTapCallback)this._handleTap : null,
behavior: HitTestBehavior.opaque,
child: result
));
}
