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110 行
3.9 KiB

using Unity.UIWidgets.foundation;
using Unity.UIWidgets.painting;
using Unity.UIWidgets.rendering;
using Unity.UIWidgets.ui;
using Unity.UIWidgets.widgets;
namespace Unity.UIWidgets.material {
public class BottomAppBar : StatefulWidget {
public BottomAppBar(
Key key = null,
Color color = null,
float? elevation = null,
NotchedShape shape = null,
Clip clipBehavior = Clip.none,
float notchMargin = 4.0f,
Widget child = null
) : base(key: key) {
D.assert(elevation == null || elevation >= 0.0f);
this.child = child;
this.color = color;
this.elevation = elevation;
this.shape = shape;
this.clipBehavior = clipBehavior;
this.notchMargin = notchMargin;
}
public readonly Widget child;
public readonly Color color;
public readonly float? elevation;
public readonly NotchedShape shape;
public readonly Clip clipBehavior;
public readonly float notchMargin;
public override State createState() {
return new _BottomAppBarState();
}
}
class _BottomAppBarState : State<BottomAppBar> {
ValueListenable<ScaffoldGeometry> geometryListenable;
const float _defaultElevation = 8.0f;
public override void didChangeDependencies() {
base.didChangeDependencies();
geometryListenable = Scaffold.geometryOf(context);
}
public override Widget build(BuildContext context) {
BottomAppBarTheme babTheme = BottomAppBarTheme.of(context);
NotchedShape notchedShape = widget.shape ?? babTheme.shape;
CustomClipper<Path> clipper = notchedShape != null
? (CustomClipper<Path>) new _BottomAppBarClipper(
geometry: geometryListenable,
shape: notchedShape,
notchMargin: widget.notchMargin
)
: new ShapeBorderClipper(shape: new RoundedRectangleBorder());
return new PhysicalShape(
clipper: clipper,
elevation: widget.elevation ?? babTheme.elevation ?? _defaultElevation,
color: widget.color ?? babTheme.color ?? Theme.of(context).bottomAppBarColor,
clipBehavior: widget.clipBehavior,
child: new Material(
type: MaterialType.transparency,
child: widget.child == null
? null
: new SafeArea(child: widget.child)
)
);
}
}
class _BottomAppBarClipper : CustomClipper<Path> {
public _BottomAppBarClipper(
ValueListenable<ScaffoldGeometry> geometry,
NotchedShape shape,
float notchMargin
) : base(reclip: geometry) {
D.assert(geometry != null);
D.assert(shape != null);
this.geometry = geometry;
this.shape = shape;
this.notchMargin = notchMargin;
}
public readonly ValueListenable<ScaffoldGeometry> geometry;
public readonly NotchedShape shape;
public readonly float notchMargin;
public override Path getClip(Size size) {
Rect button = geometry.value.floatingActionButtonArea?.translate(
0.0f,
(geometry.value.bottomNavigationBarTop ?? 0.0f) * -1.0f
);
return shape.getOuterPath(Offset.zero & size, button?.inflate(notchMargin));
}
public override bool shouldReclip(CustomClipper<Path> _oldClipper) {
_BottomAppBarClipper oldClipper = _oldClipper as _BottomAppBarClipper;
return oldClipper.geometry != geometry
|| oldClipper.shape != shape
|| oldClipper.notchMargin != notchMargin;
}
}
}