nutrient/com.pspdfkit.ui.thumbnail.compose/ThumbnailBarStateManager

ThumbnailBarStateManager

class ThumbnailBarStateManager(context: Context) : PdfDrawableProvider.DrawableProviderObserver

State manager for the thumbnail bar. This class is completely UI-independent and handles all business logic.

Key responsibilities:

  • Maintains immutable UI state via StateFlow

  • Processes UI events and updates state accordingly

  • Emits one-time effects via SharedFlow

  • Manages thumbnail rendering lifecycle

  • Handles page selection logic (single and double-page modes)

  • Manages layout calculations

This class is fully unit-testable as it has no Android UI dependencies.

Constructors

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constructor(context: Context)

Types

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object Companion

Constants for ThumbnailBarStateManager.

Properties

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val effects: SharedFlow<ThumbnailBarEffect>

Observable one-time effects for external observers (e.g., navigation, errors).

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val uiState: StateFlow<ThumbnailBarUiState>

Observable UI state for external observers (e.g., Compose UI).

Functions

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fun dispose()

Clean up resources when done.

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open override fun onDrawablesChanged(drawableProvider: PdfDrawableProvider)
open override fun onDrawablesChanged(drawableProvider: PdfDrawableProvider, pageIndex: Int)

Called when the drawables have changed.

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fun onEvent(event: ThumbnailBarEvent)

Process an event from the UI. This is the single entry point for all user actions and system events.

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