public _DropdownRoutePage(
Key key = null,
_DropdownRoute <T> route = null,
BoxConstraints constraints = null,
List <_MenuItem <T> > items = null,
EdgeInsetsGeometry padding = null,
Rect buttonRect = null,
int?selectedIndex = null,
int elevation = 0,
ThemeData theme = null,
TextStyle style = null,
Color dropdownColor = null
) : base(key: key)
{
this.route = route;
this.constraints = constraints;
this.items = items;
this.padding = padding;
this.buttonRect = buttonRect;
this.selectedIndex = selectedIndex;
this.elevation = elevation;
this.theme = theme;
this.style = style;
this.dropdownColor = dropdownColor;
}
void _handleTap()
{
RenderBox itemBox = (RenderBox)this.context.findRenderObject();
Rect itemRect = itemBox.localToGlobal(Offset.zero) & itemBox.size;
EdgeInsets menuMargin = ButtonTheme.of(this.context).alignedDropdown
? DropdownConstants._kAlignedMenuMargin
: DropdownConstants._kUnalignedMenuMargin;
D.assert(this._dropdownRoute == null);
this._dropdownRoute = new _DropdownRoute <T>(
items: this.widget.items,
buttonRect: menuMargin.inflateRect(itemRect),
padding: DropdownConstants._kMenuItemPadding,
selectedIndex: this._selectedIndex ?? 0,
elevation: this.widget.elevation,
theme: Theme.of(this.context, shadowThemeOnly: true),
style: this._textStyle,
barrierLabel: MaterialLocalizations.of(this.context).modalBarrierDismissLabel
);
Navigator.push(this.context, this._dropdownRoute).Then(newValue => {
_DropdownRouteResult <T> value = newValue as _DropdownRouteResult <T>;
this._dropdownRoute = null;
if (!this.mounted || newValue == null)
{
return;
}
if (this.widget.onChanged != null)
{
this.widget.onChanged(value.result);
}
});
}
void _handleTap()
{
RenderBox itemBox = (RenderBox)context.findRenderObject();
Rect itemRect = itemBox.localToGlobal(Offset.zero) & itemBox.size;
TextDirection textDirection = Directionality.of(context);
EdgeInsetsGeometry menuMargin = ButtonTheme.of(context).alignedDropdown
? material_._kAlignedMenuMargin
: material_._kUnalignedMenuMargin;
List <_MenuItem <T> > menuItems = new List <_MenuItem <T> >(new _MenuItem <T> [widget.items.Count]);
for (int index = 0; index < widget.items.Count; index += 1)
{
var pindex = index;
menuItems[pindex] = new _MenuItem <T>(
item: widget.items[pindex],
onLayout: (Size size) => {
if (_dropdownRoute == null)
{
return;
}
_dropdownRoute.itemHeights[pindex] = size.height;
}
);
}
D.assert(_dropdownRoute == null);
_dropdownRoute = new _DropdownRoute <T>(
items: menuItems,
buttonRect: menuMargin.resolve(textDirection).inflateRect(itemRect),
padding: material_._kMenuItemPadding.resolve(textDirection),
selectedIndex: _selectedIndex ?? 0,
elevation: widget.elevation,
theme: Theme.of(context, shadowThemeOnly: true),
style: _textStyle,
barrierLabel: MaterialLocalizations.of(context).modalBarrierDismissLabel,
itemHeight: widget.itemHeight,
dropdownColor: widget.dropdownColor
);
Navigator.push <T>(context, _dropdownRoute).then(newValue => {
_DropdownRouteResult <T> value = newValue as _DropdownRouteResult <T>;
_removeDropdownRoute();
if (!mounted || newValue == null)
{
return;
}
if (widget.onChanged != null)
{
widget.onChanged(value.result);
}
});
if (widget.onTap != null)
{
widget.onTap();
}
}
public _DropdownMenu(
Key key = null,
EdgeInsets padding = null,
_DropdownRoute <T> route = null
) : base(key: key)
{
this.route = route;
this.padding = padding;
}
public _DropdownMenuRouteLayout(
Rect buttonRect,
_DropdownRoute <T> route = null,
TextDirection?textDirection = null
)
{
this.buttonRect = buttonRect;
this.route = route;
this.textDirection = textDirection;
}
public _DropdownMenu(
Key key = null,
EdgeInsets padding = null,
_DropdownRoute <T> route = null,
Rect buttonRect = null,
BoxConstraints constraints = null,
Color dropdownColor = null
) : base(key: key)
{
this.route = route;
this.padding = padding;
this.buttonRect = buttonRect;
this.constraints = constraints;
this.dropdownColor = dropdownColor;
}
internal _DropdownMenuItemButton(
Key key = null,
_DropdownRoute <T> route = null,
EdgeInsets padding = null,
Rect buttonRect = null,
BoxConstraints constraints = null,
int?itemIndex = null
) : base(key: key)
{
this.route = route;
this.padding = padding;
this.buttonRect = buttonRect;
this.constraints = constraints;
this.itemIndex = itemIndex;
}
public override Widget build(BuildContext context)
{
D.assert(material_.debugCheckHasMaterialLocalizations(context));
MaterialLocalizations localizations = MaterialLocalizations.of(context);
_DropdownRoute <T> route = widget.route;
List <Widget> children = new List <Widget>();
for (int itemIndex = 0; itemIndex < route.items.Count; ++itemIndex)
{
children.Add(new _DropdownMenuItemButton <T>(
route: widget.route,
padding: widget.padding,
buttonRect: widget.buttonRect,
constraints: widget.constraints,
itemIndex: itemIndex
));
}
return(new FadeTransition(
opacity: _fadeOpacity,
child: new CustomPaint(
painter: new _DropdownMenuPainter(
color: widget.dropdownColor ?? Theme.of(context).canvasColor,
elevation: route.elevation,
selectedIndex: route.selectedIndex,
resize: _resize,
getSelectedItemOffset: () => route.getItemOffset(route.selectedIndex ?? 0)
),
child: new Material(
type: MaterialType.transparency,
textStyle: route.style,
child: new ScrollConfiguration(
behavior: new _DropdownScrollBehavior(),
child: new Scrollbar(
child: new ListView(
controller: widget.route.scrollController,
padding: material_.kMaterialListPadding,
shrinkWrap: true,
children: children
)
)
)
)
)
));
}
void _removeDropdownRoute()
{
_dropdownRoute?._dismiss();
_dropdownRoute = null;
_lastOrientation = null;
}
void _removeDropdownRoute()
{
this._dropdownRoute?._dismiss();
this._dropdownRoute = null;
}
public override Widget build(BuildContext context)
{
D.assert(MaterialD.debugCheckHasMaterialLocalizations(context));
MaterialLocalizations localizations = MaterialLocalizations.of(context);
_DropdownRoute <T> route = this.widget.route;
float unit = 0.5f / (route.items.Count + 1.5f);
List <Widget> children = new List <Widget>();
for (int itemIndex = 0; itemIndex < route.items.Count; ++itemIndex)
{
CurvedAnimation opacity;
if (itemIndex == route.selectedIndex)
{
opacity = new CurvedAnimation(parent: route.animation, curve: new Threshold(0.0f));
}
else
{
float start = (0.5f + (itemIndex + 1) * unit).clamp(0.0f, 1.0f);
float end = (start + 1.5f * unit).clamp(0.0f, 1.0f);
opacity = new CurvedAnimation(parent: route.animation, curve: new Interval(start, end));
}
var index = itemIndex;
children.Add(new FadeTransition(
opacity: opacity,
child: new InkWell(
child: new Container(
padding: this.widget.padding,
child: route.items[itemIndex]
),
onTap: () => Navigator.pop(
context,
new _DropdownRouteResult <T>(route.items[index].value)
)
)
));
}
return(new FadeTransition(
opacity: this._fadeOpacity,
child: new CustomPaint(
painter: new _DropdownMenuPainter(
color: Theme.of(context).canvasColor,
elevation: route.elevation,
selectedIndex: route.selectedIndex,
resize: this._resize
),
child: new Material(
type: MaterialType.transparency,
textStyle: route.style,
child: new ScrollConfiguration(
behavior: new _DropdownScrollBehavior(),
child: new Scrollbar(
child: new ListView(
controller: this.widget.route.scrollController,
padding: Constants.kMaterialListPadding,
itemExtent: DropdownConstants._kMenuItemHeight,
shrinkWrap: true,
children: children
)
)
)
)
)
));
}