flutter_watermark_plus 1.0.0

A Flutter package for adding watermarks to widgets with customizable text, positioning, and styling options..

Flutter Watermark Plus

A Flutter package that provides watermark functionality for images and widgets with customizable properties.

Features

• Cross-platform support: Works on both Android and iOS
• Widget-based watermarks: Add watermarks to any Flutter widget
• Image-based watermarks: Apply watermarks directly to images
• Customizable properties: Text style, rotation, opacity, positioning, and spacing
• Consistent behavior: Shared drawing logic ensures consistent results across different use cases

Architecture

The package has been refactored to eliminate code duplication and improve maintainability:

Core Components

• Config: Configuration class for watermark properties
• TextWatermarkWidget: Widget for adding watermarks to Flutter widgets
• CanvasWatermarkEngine: Engine for applying watermarks to images
• WatermarkPainterUtil: Shared utility for drawing watermark patterns
• WatermarkProcessor: High-level processor for image watermark operations

Code Refactoring Benefits

1. Eliminated Duplication: The watermark drawing logic was duplicated between watermark_widget.dart and canvas_watermark_engine.dart. Now both use the shared WatermarkPainterUtil.

2. Consistent Behavior: Both widget-based and image-based watermarks now use the same drawing logic, ensuring consistent results.

3. Better Maintainability: Changes to watermark drawing logic only need to be made in one place.

4. Clear Separation: Each component has a single responsibility:

   • Config: Configuration management
   • TextWatermarkWidget: Widget rendering
   • CanvasWatermarkEngine: Image processing
   • WatermarkPainterUtil: Drawing logic
   • WatermarkProcessor: High-level operations

Configuration Options

• textStyle: Text appearance (color, font size, weight, etc.)
• rotationAngle: Rotation in radians
• horizontalInterval: Horizontal spacing between watermarks
• verticalInterval: Vertical spacing between watermarks
• offset: Position offset from top-left corner
• backgroundColor: Background color of watermark area
• textAlign: Text alignment
• textDirection: Text direction (LTR/RTL)
• locale: Locale for text rendering

Examples

See the example/ folder for complete demonstrations:

• flutter_watermark_plus_example.dart: Widget-based watermark examples
• watermark_processor_example.dart: Image processing watermark examples