目前,您使用的库还没有内置的相机叠加支持。我创建了一个小部件,它位于CameraPreview堆栈中,可复制叠加效果。
@override
Widget build(BuildContext context) {
return AspectRatio(
aspectRatio: _controller.value.aspectRatio,
child: Stack(fit: StackFit.expand, children: [
CameraPreview(_controller),
cameraOverlay(
padding: 50, aspectRatio: 1, color: Color(0x55000000))
]));
}
Widget cameraOverlay({required double padding, required double aspectRatio, required Color color}) {
return LayoutBuilder(builder: (context, constraints) {
double parentAspectRatio = constraints.maxWidth / constraints.maxHeight;
double horizontalPadding;
double verticalPadding;
if (parentAspectRatio < aspectRatio) {
horizontalPadding = padding;
verticalPadding = (constraints.maxHeight -
((constraints.maxWidth - 2 * padding) / aspectRatio)) /
2;
} else {
verticalPadding = padding;
horizontalPadding = (constraints.maxWidth -
((constraints.maxHeight - 2 * padding) * aspectRatio)) /
2;
}
return Stack(fit: StackFit.expand, children: [
Align(
alignment: Alignment.centerLeft,
child: Container(width: horizontalPadding, color: color)),
Align(
alignment: Alignment.centerRight,
child: Container(width: horizontalPadding, color: color)),
Align(
alignment: Alignment.topCenter,
child: Container(
margin: EdgeInsets.only(
left: horizontalPadding, right: horizontalPadding),
height: verticalPadding,
color: color)),
Align(
alignment: Alignment.bottomCenter,
child: Container(
margin: EdgeInsets.only(
left: horizontalPadding, right: horizontalPadding),
height: verticalPadding,
color: color)),
Container(
margin: EdgeInsets.symmetric(
horizontal: horizontalPadding, vertical: verticalPadding),
decoration: BoxDecoration(border: Border.all(color: Colors.cyan)),
)
]);
});
}
Camera(
mode: CameraMode.normal,
imageMask: CameraFocus.rectangle(
color: Colors.black.withOpacity(0.5),
),
)