public CupertinoPicker(
List <Widget> children,
float itemExtent,
Key key = null,
float?diameterRatio = null,
Color backgroundColor = null,
float offAxisFraction = 0.0f,
bool useMagnifier = false,
float magnification = 1.0f,
FixedExtentScrollController scrollController = null,
float?squeeze = null,
ValueChanged <int> onSelectedItemChanged = null,
bool looping = false
) : base(key: key)
{
diameterRatio = diameterRatio == null ? CupertinoPickerUtils._kDefaultDiameterRatio : diameterRatio;
squeeze = squeeze == null ? CupertinoPickerUtils._kSqueeze : squeeze;
// D.assert(children != null);
D.assert(diameterRatio > 0.0f, () => RenderListWheelViewport.diameterRatioZeroMessage);
D.assert(magnification > 0);
D.assert(itemExtent > 0);
D.assert(squeeze > 0);
this.diameterRatio = diameterRatio;
this.backgroundColor = backgroundColor;
this.offAxisFraction = offAxisFraction;
this.useMagnifier = useMagnifier;
this.magnification = magnification;
this.scrollController = scrollController;
this.squeeze = squeeze;
this.itemExtent = itemExtent;
this.onSelectedItemChanged = onSelectedItemChanged;
childDelegate = looping
? (ListWheelChildDelegate) new ListWheelChildLoopingListDelegate(children: children)
: new ListWheelChildListDelegate(children: children);
}
public CupertinoPicker(
float itemExtent,
Key key = null,
float?diameterRatio = null,
Color backgroundColor = null,
float offAxisFraction = 0.0f,
bool useMagnifier = false,
float magnification = 1.0f,
FixedExtentScrollController scrollController = null,
float?squeeze = null,
ValueChanged <int> onSelectedItemChanged = null,
IndexedWidgetBuilder itemBuilder = null,
int?childCount = null
)
{
diameterRatio = diameterRatio == null ? CupertinoPickerUtils._kDefaultDiameterRatio : diameterRatio;
squeeze = squeeze == null ? CupertinoPickerUtils._kSqueeze : squeeze;
D.assert(itemBuilder != null);
D.assert(diameterRatio > 0.0f, () => RenderListWheelViewport.diameterRatioZeroMessage);
D.assert(magnification > 0);
D.assert(itemExtent > 0);
D.assert(squeeze > 0);
this.diameterRatio = diameterRatio;
this.backgroundColor = backgroundColor;
this.offAxisFraction = offAxisFraction;
this.useMagnifier = useMagnifier;
this.magnification = magnification;
this.scrollController = scrollController;
this.squeeze = squeeze;
this.itemExtent = itemExtent;
this.onSelectedItemChanged = onSelectedItemChanged;
childDelegate = new ListWheelChildBuilderDelegate(builder: itemBuilder, childCount: childCount);
}
public static CupertinoPicker builder(
float itemExtent,
ValueChanged <int> onSelectedItemChanged,
IndexedWidgetBuilder itemBuilder,
Key key = null,
float diameterRatio = CupertinoPickerUtils._kDefaultDiameterRatio,
Color backgroundColor = null,
float offAxisFraction = 0.0f,
bool useMagnifier = false,
float magnification = 1.0f,
FixedExtentScrollController scrollController = null,
int?childCount = null
)
{
D.assert(itemBuilder != null);
D.assert(diameterRatio > 0.0f, () => RenderListWheelViewport.diameterRatioZeroMessage);
D.assert(magnification > 0);
D.assert(itemExtent > 0);
return(new CupertinoPicker(
itemExtent: itemExtent,
onSelectedItemChanged: onSelectedItemChanged,
key: key,
diameterRatio: diameterRatio,
backgroundColor: backgroundColor,
offAxisFraction: offAxisFraction,
useMagnifier: useMagnifier,
magnification: magnification,
scrollController: scrollController,
childDelegate: new ListWheelChildBuilderDelegate(builder: itemBuilder, childCount: childCount)
));
}
public CupertinoPicker(
float itemExtent,
ValueChanged <int> onSelectedItemChanged,
List <Widget> children = null,
Key key = null,
float diameterRatio = CupertinoPickerUtils._kDefaultDiameterRatio,
Color backgroundColor = null,
float offAxisFraction = 0.0f,
bool useMagnifier = false,
float magnification = 1.0f,
FixedExtentScrollController scrollController = null,
bool looping = false,
ListWheelChildDelegate childDelegate = null
) : base(key: key)
{
D.assert(children != null || childDelegate != null);
D.assert(diameterRatio > 0.0, () => RenderListWheelViewport.diameterRatioZeroMessage);
D.assert(magnification > 0);
D.assert(itemExtent > 0);
this.childDelegate = childDelegate ?? (looping
? (ListWheelChildDelegate) new ListWheelChildLoopingListDelegate(
children: children)
: (ListWheelChildDelegate) new ListWheelChildListDelegate(children: children));
this.itemExtent = itemExtent;
this.onSelectedItemChanged = onSelectedItemChanged;
this.diameterRatio = diameterRatio;
this.backgroundColor = backgroundColor ?? CupertinoPickerUtils._kDefaultBackground;
this.offAxisFraction = offAxisFraction;
this.useMagnifier = useMagnifier;
this.magnification = magnification;
this.scrollController = scrollController;
}
public _CupertinoPickerSemantics(
Key key = null,
Widget child = null,
FixedExtentScrollController scrollController = null
) : base(key: key, child: child)
{
this.scrollController = scrollController;
}
public override void initState()
{
base.initState();
if (widget.scrollController == null)
{
_controller = new FixedExtentScrollController();
}
}
Widget _buildColorPicker(BuildContext context)
{
FixedExtentScrollController scrollController =
new FixedExtentScrollController(initialItem: this._selectedColorIndex);
List <Widget> generateList()
{
var list = new List <Widget>();
foreach (var item in CupertinoNavigationDemoUtils.coolColorNames)
{
list.Add(new Center(child:
new Text(item)
));
}
return(list);
}
return(new GestureDetector(
onTap: () => {
CupertinoRouteUtils.showCupertinoModalPopup(
context: context,
builder: (BuildContext _context) => {
return this._buildBottomPicker(
new CupertinoPicker(
scrollController: scrollController,
itemExtent: CupertinoPickerDemoUtils._kPickerItemHeight,
backgroundColor: CupertinoColors.white,
onSelectedItemChanged: (int index) => {
this.setState(() => this._selectedColorIndex = index);
},
children: generateList()
)
);
}
);
},
child: this._buildMenu(new List <Widget> {
new Text("Favorite Color"),
new Text(
CupertinoNavigationDemoUtils.coolColorNames[this._selectedColorIndex],
style: new TextStyle(
color: CupertinoColors.inactiveGray
)
)
}
)
));
}
public override void didUpdateWidget(StatefulWidget oldWidget)
{
if (this.widget.scrollController != null && ((CupertinoPicker)oldWidget).scrollController == null)
{
this._controller = null;
}
else if (this.widget.scrollController == null && ((CupertinoPicker)oldWidget).scrollController != null)
{
D.assert(this._controller == null);
this._controller = new FixedExtentScrollController();
}
base.didUpdateWidget(oldWidget);
}
Widget _buildColorPicker(BuildContext context)
{
FixedExtentScrollController scrollController = new FixedExtentScrollController(initialItem: _selectedColorIndex);
List <Widget> widgets = new List <Widget>();
for (int i = 0; i < CupertinoPickerDemoUtils.coolColorNames.Count; i++)
{
widgets.Add(new Center(
child: new Text(CupertinoPickerDemoUtils.coolColorNames[i])
));
}
return(new GestureDetector(
onTap: () => {
CupertinoRouteUtils.showCupertinoModalPopup(
context: context,
semanticsDismissible: true,
builder: (BuildContext context1) => {
return new _BottomPicker(
child: new CupertinoPicker(
scrollController: scrollController,
itemExtent: CupertinoPickerDemoUtils._kPickerItemHeight,
backgroundColor: CupertinoColors.systemBackground.resolveFrom(context1),
onSelectedItemChanged: (int index) => {
setState(() => _selectedColorIndex = index);
},
children: widgets
)
);
}
);
},
child: new _Menu(
children: new List <Widget> {
new Text("Favorite Color"),
new Text(
CupertinoPickerDemoUtils.coolColorNames[_selectedColorIndex],
style: new TextStyle(color: CupertinoDynamicColor.resolve(CupertinoColors.inactiveGray, context))
)
}
)
));
}
public _RenderCupertinoPickerSemantics(FixedExtentScrollController controller, TextDirection textDirection)
{
this.controller = controller;
_textDirection = textDirection;
}