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[eric] canvas: classify mouse notches by wheelDeltaY tick signature; revert multiplier bump, slider governs

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ciregenz
2026-07-20 18:11:51 -07:00
parent b0606b786f
commit 6eed04b1d3
1 changed files with 5 additions and 2 deletions
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frontend/src/app/pages/Dashboard/hooks/interaction/useCanvasControls.ts
+5 -2
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@@ -23,9 +23,9 @@ const WHEEL_ZOOM_DELTA_CAP = 24;
const WHEEL_STREAM_GAP_MS = 150;
const MOUSE_NOTCH_MIN_DELTA = 40;
// Maps the 1 to 100 user setting to an internal multiplier (50 default = 0.005; a mouse notch = ~8% zoom step).
// Maps the 1 to 100 user setting to an internal multiplier (50 default = 0.004).
function sensitivityToMultiplier(setting: number): number {
return 0.0001 * setting;
return 0.00008 * setting;
}
interface CanvasState {
@@ -246,8 +246,11 @@ export function useCanvasControls(zoomSensitivity: number = 50, contentBounds?:
const inStream = e.timeStamp - lastWheelDeviceAt < WHEEL_STREAM_GAP_MS;
lastWheelDeviceAt = e.timeStamp;
if (inStream) return lastWheelWasTrackpad;
// Chromium stamps discrete wheel notches with legacy wheelDeltaY = ticks*120; trackpads report 3x the pixel delta. This catches slow mouse notches that macOS acceleration shrinks below any pixel threshold.
const legacy = (e as WheelEvent & { wheelDeltaY?: number }).wheelDeltaY ?? 0;
let trackpad: boolean;
if (e.deltaMode !== 0) trackpad = false;
else if (legacy !== 0 && legacy % 120 === 0 && dx === 0) trackpad = false;
else if (dx !== 0 || !Number.isInteger(dy)) trackpad = true;
else trackpad = Math.abs(dy) < MOUSE_NOTCH_MIN_DELTA;
lastWheelWasTrackpad = trackpad;