🎨 UI System Breakdown — Custom Widgets, Theme Engine & Interaction Models

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UI System Breakdown — Custom Widgets, Theme Engine, and Interaction Models

This discussion provides a detailed overview of the UI layer in ListenMe Player — one of the most unique parts of the project. The app includes a wide range of custom widgets designed for precise control, deep customization, and smooth user interaction.

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Custom Widgets and Interaction Components

Jog Wheel (rotating disc)

• Visually rotates while scrubbing
• Shadow remains static for realistic depth
• Central Play/Pause button
• Outer knob handles seek gestures
• Supports smooth, continuous position updates without frequent seek calls

This is one of the most complex UI components in the entire app.

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Silence Control Bar

• Adjustable silence threshold
• PCM level visualization
• Silence markers
• Buttons for jumping to silence regions
• Built on data provided by the AudioToLevelsModel
• Consistent vertical alignment of icons and elements across all devices

This widget displays real-time audio analysis results.

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Theme Editor Widgets

• Custom color sliders
• Gradient configuration
• Shadow configuration
• Instant visual feedback
• Saving user-defined themes
• Preset themes + custom themes
• Background image with adjustable brightness, contrast, and opacity

This subsystem forms a complete UI customization engine.

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Progress Slider

• Custom thumb shape (ThemedThumbShape)
• Shared logic for active/inactive segments
• Marker support for segment playback
• Double-tap markers to align them with the current position
• Precise adjustment buttons that follow marker positions

This is one of the most accurate and flexible UI elements in the project.

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Layout System and Reordering

Users can:

• Enable or disable individual widgets
• Reorder UI elements
• Keep certain components fixed (e.g., track title)
• Move combined blocks (time, markers, slider) as a single unit

This system is implemented using a unified layout configuration model.

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Interaction Principles

The UI is built around the following principles:

• High precision interaction
• Predictable behavior
• Instant feedback
• Controls optimized for language learners and podcasters
• Nearly every element of the interface can be customized

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Discussion

If you want a deeper breakdown of any widget, gesture handler, or interaction model, feel free to ask in this thread.

Suggestions for improving UI or UX are also welcome.