Summary

Add MpLink component - a clickable link widget similar to HTML <a> tag.

Features

• ✅ Click handling with href property to open URLs
• ✅ Hover and pressed states with smooth animations
• ✅ Underline decoration using custom shader
• ✅ Keyboard support (Enter/Space keys)
• ✅ Disabled state support
• ✅ Action system integration (MpLinkAction::Clicked)
• ✅ Hand cursor on hover

Implementation Details

Core Component (crates/ui/src/widgets/link.rs)

• Uses DrawText for text rendering
• Uses DrawQuad with custom shader for underline decoration
• Implements hover/pressed animations with opacity transitions
• Opens URLs using cx.open_url(href, OpenUrlInPlace::No)
• Supports keyboard activation (Enter/Space)

Demo (crates/component-zoo/src/app.rs)

• Basic links section with multiple examples
• Inline usage showing links within text flow

Documentation

• Updated CLAUDE.md to mark Link as implemented
• Moved from "待实现组件" to "已实现组件"

Commits

1. c4b7cf3 - Initial Link component implementation
2. e77294e - Improvements based on makepad-skills guidance:
   • Add underline decoration shader
   • Declare shader instance variables
   • Add keyboard support
   • Extract activate_link() helper method

Testing

• ✅ Compiles successfully with cargo check
• ✅ Follows Makepad widget patterns
• ✅ Uses makepad-skills best practices

Screenshots

See Component Zoo demo for visual examples.