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fix(flutter): reduce accidental horizontal trackpad scrolling during vertical pan (#14460)

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* fix(flutter): reduce accidental horizontal trackpad scrolling during vertical pan

Signed-off-by: fufesou <linlong1266@gmail.com>

* refact: comments

Signed-off-by: fufesou <linlong1266@gmail.com>

---------

Signed-off-by: fufesou <linlong1266@gmail.com>
This commit is contained in:
fufesou
2026-03-05 23:10:39 +08:00
committed by GitHub
parent 1abc897c45
commit 0d3016fcd8
1 changed files with 25 additions and 0 deletions
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25
flutter/lib/models/input_model.dart
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@@ -348,6 +348,12 @@ class InputModel {
final _trackpadAdjustPeerLinux = 0.06;
// This is an experience value.
final _trackpadAdjustMacToWin = 2.50;
// Ignore directional locking for very small deltas on both axes (including
// tiny single-axis movement) to avoid over-filtering near zero.
static const double _trackpadAxisNoiseThreshold = 0.2;
// Lock to dominant axis only when one axis is clearly stronger.
// 1.6 means the dominant axis must be >= 60% larger than the other.
static const double _trackpadAxisLockRatio = 1.6;
int _trackpadSpeed = kDefaultTrackpadSpeed;
double _trackpadSpeedInner = kDefaultTrackpadSpeed / 100.0;
var _trackpadScrollUnsent = Offset.zero;
@@ -1172,6 +1178,7 @@ class InputModel {
if (isMacOS && peerPlatform == kPeerPlatformWindows) {
delta *= _trackpadAdjustMacToWin;
}
delta = _filterTrackpadDeltaAxis(delta);
_trackpadLastDelta = delta;
var x = delta.dx.toInt();
@@ -1204,6 +1211,24 @@ class InputModel {
}
}
Offset _filterTrackpadDeltaAxis(Offset delta) {
final absDx = delta.dx.abs();
final absDy = delta.dy.abs();
// Keep diagonal intent when movement is tiny on both axes.
if (absDx < _trackpadAxisNoiseThreshold &&
absDy < _trackpadAxisNoiseThreshold) {
return delta;
}
// Dominant-axis lock to reduce accidental cross-axis scrolling noise.
if (absDy >= absDx * _trackpadAxisLockRatio) {
return Offset(0, delta.dy);
}
if (absDx >= absDy * _trackpadAxisLockRatio) {
return Offset(delta.dx, 0);
}
return delta;
}
void _scheduleFling(double x, double y, int delay) {
if (isViewCamera) return;
if ((x == 0 && y == 0) || _stopFling) {