Function isShiftLeftDrag

src/interaction/createInsideZoom.ts:60–61

(e: PointerEvent)

  e.pointerType === 'mouse' && (e.buttons & 4) !== 0;

const isShiftLeftDrag = (e: PointerEvent): boolean =>
  e.pointerType === 'mouse' && e.shiftKey && (e.buttons & 1) !== 0;

/**
 * Internal “inside” zoom interaction: