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🌗 Smart Theme Switch

Instant System Mode Control via the Logitech Actions Ring

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The Problem

Switching between Light and Dark mode in Windows is a surprisingly high-friction task.

Users must:

• Navigate through system settings
  
• Rely on time-based automation
  
• Or use third-party tools
  

Yet theme switching is highly contextual:

• Light mode for presentations
  
• Dark mode for coding
  
• Light during the day
  
• Dark at night
  

It’s a small action — but one that breaks flow every time.

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The Solution

Smart Theme Switch brings instant Light/Dark control directly to the Logitech MX Master Actions Ring.

With a single press:

• 🔄 Toggle between Light and Dark
  
• 👁️ See the current theme state in real time
  
• ⚡ Experience immediate system-wide visual feedback
  

No settings navigation. No disruption. Just flow.

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Why This Matters for Logitech

The Actions Ring is designed for:

• Fast contextual interaction
  
• Workflow acceleration
  
• Seamless hardware-to-software integration
  

Theme switching is a perfect example of a micro-interaction that benefits from hardware access:

• It’s visual
  
• It’s state-based
  
• It’s frequently used
  
• It demonstrates OS-level control
  

This plugin transforms the ring into a system-level mode controller.

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Technical Implementation

• Built with .NET (C#) using the Logitech Actions SDK
  
• Implemented as a Multistate Action
  • State 0 → Light
    
  • State 1 → Dark
    
• Uses Windows registry as the source of truth
  
• Updates:
  • AppsUseLightTheme
  • SystemUsesLightTheme
• Broadcasts WM_SETTINGCHANGE for immediate UI refresh
  

Lightweight. Native. Reliable.

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User Experience

1. Open the Actions Ring
   
2. Instantly see current theme state
   
3. Press once → entire system visually transforms
   

The interaction is immediate, satisfying, and frictionless.

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Future Potential

This concept can expand into:

• Scheduled switching (sunrise/sunset)
• Per-application overrides
  
• Focus profiles (Coding / Presentation / Night Mode)
• Integration with Focus Assist or system presets
  

The ring becomes a context-aware system control hub.

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Why This Project Stands Out

• Solves a real, daily workflow friction
  
• Demonstrates deep OS integration
  
• Perfectly aligned with the Actions ecosystem
  
• Clean technical implementation
  
• Strong, visually impactful demo
  

Smart Theme Switch showcases how Logitech hardware can directly control and enhance the operating system experience.

Built With

• .net
• c#