NxShimmerBox class

A loading placeholder widget that displays a shimmer animation effect.

This widget creates a container with a shimmering animation, commonly used to indicate loading states in the UI. The shimmer effect moves across the container, creating a subtle loading animation.

Example usage:

// Basic shimmer box with default size
NxShimmerBox()

// Custom sized shimmer box
NxShimmerBox(
  width: 200,
  height: 100,
  opacity: 0.8,
  color: Colors.grey[300],
)

// Loading card with shimmer effect
Card(
  child: Padding(
    padding: EdgeInsets.all(16),
    child: Column(
      children: [
        NxShimmerBox(
          height: 24,
          width: double.infinity,
        ),
        SizedBox(height: 8),
        NxShimmerBox(
          height: 100,
          width: double.infinity,
        ),
      ],
    ),
  ),
)