62 lines
1.9 KiB
Dart
62 lines
1.9 KiB
Dart
 
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import 'dart:async';
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import 'package:flutter/gestures.dart';
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import 'package:flutter/material.dart';
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import '../models/ink_point.dart';
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import '../models/pen_tool.dart';
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import '../models/pointer_device_kind.dart';
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class PenInputService {
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final StreamController<InkPoint> _pointController =
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StreamController<InkPoint>.broadcast();
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Stream<InkPoint> get pointStream => _pointController.stream;
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PenTool currentTool = PenTool.pen;
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Color currentColor = Colors.black;
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double currentStrokeWidth = 2.0;
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void addPoint(InkPoint point) {
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_pointController.add(point);
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}
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InputDeviceKind mapFlutterKind(PointerDeviceKind kind) {
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switch (kind) {
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case PointerDeviceKind.touch:
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return InputDeviceKind.touch;
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case PointerDeviceKind.mouse:
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return InputDeviceKind.mouse;
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case PointerDeviceKind.stylus:
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return InputDeviceKind.stylus;
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case PointerDeviceKind.invertedStylus:
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return InputDeviceKind.invertedStylus;
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case PointerDeviceKind.trackpad:
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return InputDeviceKind.trackpad;
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case PointerDeviceKind.unknown:
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return InputDeviceKind.unknown;
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}
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}
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InkPoint fromPointerEvent(PointerEvent event) {
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// Devices without real pressure support (mouse, basic touch) report a
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// degenerate range where pressureMin == pressureMax, which can yield a
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// pressure of 0.0 and produce zero-width strokes. In that case fall back
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// to a neutral mid-pressure value so strokes remain visible.
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final pressure = event.pressureMin == event.pressureMax
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? 0.5
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: event.pressure;
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return InkPoint(
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x: event.localPosition.dx,
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y: event.localPosition.dy,
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pressure: pressure,
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tilt: event is PointerMoveEvent ? event.tilt : 0.0,
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timestamp: event.timeStamp.inMicroseconds,
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pointerDeviceKind: mapFlutterKind(event.kind),
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);
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}
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void dispose() {
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_pointController.close();
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}
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}
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