🌗 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.