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flutter software mouse cursor
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| class MouseCursorPainter extends CustomPainter { | |
| MouseCursorPainter({required this.offset, this.factor = 64.0}); | |
| final Offset offset; | |
| final double factor; | |
| @override | |
| void paint(Canvas canvas, Size size) { | |
| final path = ui.Path() | |
| ..moveTo(offset.dx, offset.dy) | |
| ..lineTo(offset.dx, offset.dy + 48 * factor / 64) | |
| ..lineTo(offset.dx + 34 * factor / 64, offset.dy + 34 * factor / 64) | |
| ..close(); | |
| canvas.drawPath( | |
| path, | |
| Paint() | |
| ..color = Colors.black | |
| ..style = ui.PaintingStyle.fill, | |
| ); | |
| canvas.drawPath( | |
| path, | |
| Paint() | |
| ..color = Colors.white | |
| ..style = ui.PaintingStyle.stroke | |
| ..strokeJoin = ui.StrokeJoin.miter | |
| ..strokeWidth = 3.5 * factor / 64, | |
| ); | |
| } | |
| @override | |
| bool shouldRepaint(covariant MouseCursorPainter oldDelegate) { | |
| return oldDelegate.offset != offset; | |
| } | |
| } | |
| class SoftwareMouseCursor extends StatelessWidget { | |
| SoftwareMouseCursor({Key? key, required this.child}) : super(key: key); | |
| final cursorPos = ValueNotifier(Offset.zero); | |
| final Widget child; | |
| @override | |
| Widget build(BuildContext context) { | |
| return Listener( | |
| onPointerDown: (event) { | |
| if (event.kind == PointerDeviceKind.mouse) { | |
| cursorPos.value = event.position; | |
| } | |
| }, | |
| onPointerMove: (event) { | |
| if (event.kind == PointerDeviceKind.mouse) { | |
| cursorPos.value = event.position; | |
| } | |
| }, | |
| onPointerUp: (event) { | |
| if (event.kind == PointerDeviceKind.mouse) { | |
| cursorPos.value = event.position; | |
| } | |
| }, | |
| onPointerHover: (event) { | |
| if (event.kind == PointerDeviceKind.mouse) { | |
| cursorPos.value = event.position; | |
| } | |
| }, | |
| behavior: HitTestBehavior.translucent, | |
| child: ValueListenableBuilder<Offset>( | |
| valueListenable: cursorPos, | |
| builder: (context, pos, child) { | |
| return CustomPaint( | |
| foregroundPainter: MouseCursorPainter( | |
| offset: pos, | |
| factor: ui.window.devicePixelRatio * 64, | |
| ), | |
| child: child, | |
| ); | |
| }, | |
| child: RepaintBoundary( | |
| child: child, | |
| ), | |
| ), | |
| ); | |
| } | |
| } |
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