void showButtonMenu()
{
PopupMenuThemeData popupMenuTheme = PopupMenuTheme.of(context);
RenderBox button = (RenderBox)context.findRenderObject();
RenderBox overlay = (RenderBox)Overlay.of(context).context.findRenderObject();
RelativeRect position = RelativeRect.fromRect(
Rect.fromPoints(
button.localToGlobal(widget.offset, ancestor: overlay),
button.localToGlobal(button.size.bottomRight(Offset.zero), ancestor: overlay)
),
Offset.zero & overlay.size
);
List <PopupMenuEntry <T> > items = widget.itemBuilder(context);
if (items.isNotEmpty())
{
material_.showMenu <T>(
context: context,
elevation: widget.elevation ?? popupMenuTheme.elevation,
items: items,
initialValue: widget.initialValue,
position: position,
shape: widget.shape ?? popupMenuTheme.shape,
color: widget.color ?? popupMenuTheme.color,
captureInheritedThemes: widget.captureInheritedThemes
)
.then(newValue => {
if (!mounted)
{
return;
}
if (newValue == null)
{
if (widget.onCanceled != null)
{
widget.onCanceled();
}
return;
}
if (widget.onSelected != null)
{
widget.onSelected((T)newValue);
}
});
}
}
public override Widget build(BuildContext context)
{
ThemeData theme = Theme.of(context);
PopupMenuThemeData popupMenuTheme = PopupMenuTheme.of(context);
TextStyle style = widget.textStyle ?? popupMenuTheme.textStyle ?? theme.textTheme.subtitle1;
if (!widget.enabled)
{
style = style.copyWith(color: theme.disabledColor);
}
Widget item = new AnimatedDefaultTextStyle(
style: style,
duration: material_.kThemeChangeDuration,
child: new Container(
alignment: AlignmentDirectional.centerStart,
constraints: new BoxConstraints(minHeight: widget.height),
padding: EdgeInsets.symmetric(horizontal: material_._kMenuHorizontalPadding),
child: buildChild()
)
);
if (!widget.enabled)
{
bool isDark = theme.brightness == Brightness.dark;
item = IconTheme.merge(
data: new IconThemeData(opacity: isDark ? 0.5f : 0.38f),
child: item
);
}
return(new InkWell(
onTap: widget.enabled?handleTap: (GestureTapCallback)null,
canRequestFocus: widget.enabled,
child: item
));
}
public override Widget build(BuildContext context)
{
float unit = 1.0f / (route.items.Count + 1.5f);
List <Widget> children = new List <Widget>();
PopupMenuThemeData popupMenuTheme = PopupMenuTheme.of(context);
for (int i = 0; i < route.items.Count; i += 1)
{
int index = i;
float start = (index + 1) * unit;
float end = (start + 1.5f * unit).clamp(0.0f, 1.0f);
CurvedAnimation opacityCurvedAnimation = new CurvedAnimation(
parent: route.animation,
curve: new Interval(start, end)
);
Widget item = route.items[index];
if (route.initialValue != null && route.items[index].represents((T)route.initialValue))
{
item = new Container(
color: Theme.of(context).highlightColor,
child: item
);
}
children.Add(
new _MenuItem(
onLayout: (Size size) => { route.itemSizes[index] = size; },
child: new FadeTransition(
opacity: opacityCurvedAnimation,
child: item
)
)
);
}
CurveTween opacity = new CurveTween(curve: new Interval(0.0f, 1.0f / 3.0f));
CurveTween width = new CurveTween(curve: new Interval(0.0f, unit));
CurveTween height = new CurveTween(curve: new Interval(0.0f, unit * route.items.Count));
Widget child = new ConstrainedBox(
constraints: new BoxConstraints(
minWidth: material_._kMenuMinWidth,
maxWidth: material_._kMenuMaxWidth
),
child: new IntrinsicWidth(
stepWidth: material_._kMenuWidthStep,
child: new SingleChildScrollView(
padding: EdgeInsets.symmetric(
vertical: material_._kMenuVerticalPadding
),
child: new ListBody(children: children)
)
)
);
return(new AnimatedBuilder(
animation: route.animation,
builder: (_, builderChild) => {
return new Opacity(
opacity: opacity.evaluate(route.animation),
child: new Material(
shape: route.shape ?? popupMenuTheme.shape,
color: route.color ?? popupMenuTheme.color,
type: MaterialType.card,
elevation: route.elevation ?? popupMenuTheme.elevation ?? 8.0f,
child: new Align(
alignment: Alignment.topRight,
widthFactor: width.evaluate(route.animation),
heightFactor: height.evaluate(route.animation),
child: builderChild
)
)
);
},
child: child
));
}
public override Widget wrap(BuildContext context, Widget child)
{
PopupMenuTheme ancestorTheme = context.findAncestorWidgetOfExactType <PopupMenuTheme>();
return(ReferenceEquals(this, ancestorTheme) ? child : new PopupMenuTheme(data: data, child: child));
}
public static PopupMenuThemeData of(BuildContext context)
{
PopupMenuTheme popupMenuTheme = context.dependOnInheritedWidgetOfExactType <PopupMenuTheme>();
return(popupMenuTheme?.data ?? Theme.of(context).popupMenuTheme);
}
