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feat: track zoom delta for DelegateInputHandler

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This commit is contained in:
Nick Fisher
2024-10-23 14:10:41 +08:00
parent c6640cef96
commit 4371dbda3c
1 changed files with 23 additions and 4 deletions
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27
thermion_dart/lib/src/input/src/delegate_input_handler.dart
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@@ -266,15 +266,34 @@ class DelegateInputHandler implements InputHandler {
// noop
}
double? _lastScale;
@override
Future<void> onScaleUpdate(Vector2 focalPoint, Vector2 focalPointDelta,
double horizontalScale, double verticalScale, double scale, int pointerCount) async {
Future<void> onScaleUpdate(
Vector2 focalPoint,
Vector2 focalPointDelta,
double horizontalScale,
double verticalScale,
double scale,
int pointerCount) async {
if (pointerCount == 1) {
_inputDeltas[InputType.SCALE1] =
Vector3(focalPointDelta.x, focalPointDelta.y, 0);
} else if (pointerCount == 2) {
_inputDeltas[InputType.SCALE2] =
Vector3(0, 0, max(horizontalScale, verticalScale));
var zoomDelta = 0.0;
if (_lastScale == null) {
if (scale < 0) {
zoomDelta = 1;
} else if (scale > 0) {
zoomDelta = -1;
}
_lastScale = scale;
} else {
zoomDelta = scale < _lastScale! ? 1 : -1;
_lastScale = scale;
}
_inputDeltas[InputType.SCALE2] = Vector3(0, 0, zoomDelta);
} else {
throw UnimplementedError("Only pointerCount <= 2 supported");
}