Implement pagination for file entries in View class

[Revers-BR]

Implement pagination for file entries in View

This PR introduces pagination for the file entries in the View class to handle folders with a large number of files efficiently.

Changes:

• Added member variables to View:

  • current_start_index – tracks the start index of the currently displayed batch.
  • last_loaded_index – tracks the index for the next batch.
  • MAX_BATCH – sets the maximum number of files displayed per page (50).

• Updated View::update():

  • Displays only a batch of MAX_BATCH file entries at a time.
  • Adds Next and Back buttons for navigation between pages.
  • Automatically hides the Next button if there are no more files to show.
  • Shows the Back button only when the user has advanced from the first batch.
  • Ensures that the list is replaced with each new batch instead of appending.

• Navigation buttons (Back and Next) are in English to maintain UI consistency.

Benefits:

• Improves performance and responsiveness when opening folders with many files (e.g., sdcard).
• Provides clear navigation for large directories without overwhelming the UI.
• Keeps the root folder navigation intact (navigate_up_button visibility remains correct).

Screenshots (optional):

• Root folder: shows data, sdcard, and Next if more than 50 entries.
• sdcard folder: pagination works correctly with Next/Back buttons.

Summary by CodeRabbit

• New Features

  • Directory listings load in batches for faster browsing of large folders.
  • Added Next and Back controls to page through directory entries.
  • File labels now include file size for regular files.

• Bug Fixes

  • Improved synchronization and stability during file-list rendering to reduce hangs and glitches.
  • More consistent handling of directory, file, and symlink selection behavior.

[coderabbitai]

📝 Walkthrough

Walkthrough

The View class signature changed: update() → update(size_t start_index = 0). Three new members track batching: current_start_index, last_loaded_index, and MAX_BATCH (const, 50). Rendering was refactored to produce directory entries in batches, with Back and Next navigation controls when applicable. A new helper resolveDirentFromListIndex(int32_t, dirent&) centralizes index-to-dirent mapping. LVGL mutex acquisition now returns early on failure.

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Implement pagination for file entries in View class' accurately describes the main change: introducing pagination functionality to handle file entries in batches with navigation controls.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[coderabbitai]

Actionable comments posted: 2

[KenVanHoeylandt]

That looks like a good feature to have, thanks!

CodeRabbit seems to have found some potential issues, so please take a look.
If you think it's not a bug, just put a comment in the relevant thread with the reasoning why.

[coderabbitai]

Actionable comments posted: 1

[coderabbitai]

Actionable comments posted: 1