Added #

• Freeze Panes: New Sheet.frozenRows and Sheet.frozenColumns setters/getters (nullable int?). Each sheet in a workbook can carry its own independent freeze combination (rows+cols, rows only, cols only, or none). Values are serialized as OOXML-compliant <pane> elements on save and fully restored on decode.
• Examples: example/excel_freeze_panes.dart (single-sheet samples) and example/excel_freeze_panes_multisheet.dart (multi-sheet workbook with per-sheet freezes and round-trip assertions).
• Flutter example app: New Freeze Panes and Multi-Sheet Freeze Panes sidebar sections, with matching helpers and code snippets.
• Tests: Re-enabled test/freeze_panes_test.dart covering the four freeze configurations (4/4 passing).
• Documentation: README "Features" and "Usage" sections now document the freeze-pane API.

Fixed #

• <sheetView> writer: Only the first sheet in the workbook carries tabSelected="1" (Excel requires exactly one active tab). <selection> entries and activePane are now chosen dynamically based on the actual split configuration, so Excel no longer shows the "Reparaciones / Recover as much as we can" dialog on multi-sheet workbooks.

Added #

• Sheet Protection: Added full programmatic support for worksheet protection, including password hashing (legacy 16-bit XOR algorithm) and custom protection settings (objects, scenarios, format cells, select locked/unlocked cells, etc.).
• Cell Style Locking: Exposed locked and hidden boolean properties on CellStyle to control cell editability/visibility under sheet protection.
• Worksheet Protection Parsing & Serialization: Added parser and serializer rules to correctly process and serialize worksheet protection states and cell locking XML elements, fully compatible with Microsoft Excel and Google Sheets.

Fixed #

• Wasm: Fix save excel file.
• Lint issues: Fix lint issues.
• XML parsing pipeline: Refactored to use a streaming-based approach with iterative DOM building instead of full recursive parsing.
• Performance: Optimized cell coordinate parsing and XML value extraction for better performance.
• Memory usage: Reduced memory usage during XML parsing by avoiding full recursive parsing.

Fixed #

• Cell Style: Fix underline and strikethrough preservation bug in CellStyle constructor and parsing logic.
• Cell Style: Add strikethrough text style support.
• Cell Style: Add comprehensive tests for underline and strikethrough preservation.
• Cell Style: Update Flutter example with underline and strikethrough demos.

Fixed #

• Wasm: Fix save excel file.
• Lint issues: Fix lint issues.

Improved #

• XML parsing pipeline: Refactored to use a streaming-based approach with iterative DOM building instead of full recursive parsing.
• Performance: Optimized cell coordinate parsing and XML value extraction for better performance.
• Memory usage: Reduced memory usage during XML parsing by avoiding full recursive parsing.

Fixed #

• XML parsing: NullPointerException: Fixed NullPointerException in _XfCache._readXfs method when processing shared strings with rich text formatting.

Fixed #

• Chart XML — series name (c:tx): The series name inside <c:tx> was incorrectly wrapped in <c:strLit>, which is not a valid child according to the OOXML CT_SerTx schema (§21.2.2.174). It now correctly uses <c:v> directly, fixing broken/missing series names when opening generated files in Microsoft Excel.
• Chart XML — element order in CT_Chart: <c:autoTitleDeleted> was emitted before <c:title>, violating the required sequence defined in OOXML §21.2.2.29. The order is now <c:title> → <c:autoTitleDeleted>, fixing chart validation errors in strict Excel readers.
• standard_21 format code: Was 'h:mm:dd' (invalid), corrected to 'h:mm:ss' per ECMA-376 §18.8.30.
• standard_40 format code: Was '#,##0.00;[Red](#,#)' (truncated), corrected to '#,##0.00;[Red](#,##0.00)'.

Added #

• Complete OOXML standard number format table (ECMA-376 §18.8.30): added previously missing built-in format IDs:
  • Currency formats standard_5–standard_8 ($#,##0, $#,##0.00 with normal/red negative variants).
  • Reserved/fallback formats standard_23–standard_26 (mapped to General).
  • CJK locale date/time formats standard_27–standard_36.
  • Accounting with fill-character formats standard_41–standard_44 (_(* …) / _($* …) patterns).
• Parser refactor: split monolithic parse.dart into styles_parser.dart (style/XF resolution) and worksheet_parser.dart (row/cell parsing) for improved maintainability.

Added #

• Image embedding support: embed PNG, JPEG, GIF, BMP, TIFF, WMF, EMF, SVG, WebP, and ICO images into worksheets.
• ExcelImage model class with fromFile factory for automatic type detection from file extension.
• ExcelImageType enum with fromExtension factory covering 10 image formats.
• ImageAnchor class with fromPixels factory (96 DPI) and direct EMU constructor.
• SheetImages extension on Sheet exposing addImage() and images getter.
• _ImageManager save-pipeline component that writes OOXML drawing, relationship, and media files.
• New example example/excel_images.dart demonstrating PNG and SVG embedding.
• README "Images" section with full usage examples and supported-formats table.

• Fix Excel Community logo.

• Added logo for the package in the README.md.

• Add Excel Community logo to pub.dev.

• Update logo to open source version.
• Improve package README.md and add a preview image.
• Update package metadata for pub.dev.
• Fix chart x-axis labels for scatter charts.

• Fix Losing Cell styling when setting a new value to a cell.

• Fix rich-text bold/italic/underline parsing per ECMA-376

• add funding text

• Fix underline preservation bug in CellStyle constructor and parsing logic.
• Add strikethrough text style support.
• Add comprehensive tests for underline and strikethrough preservation.
• Update Flutter example with underline and strikethrough demos.

• Fix color accessibility.

• Apply clean code fix minors bugs.

• Apply Clean Architecture in Save class.
• Refactor Sheet class.
• Refactor Color class.
• Refactor Border class.
• Refactor Formula class.
• Refactor NumberFormat class.

• Renamed main example to example/main.dart for better visibility on pub.dev.
• Significantly increased documentation coverage (>28%) across the public API.
• Added detailed documentation for all chart types and cell value classes.

• Reorganized tests: moved manual debug scripts to test/manual/.
• Fixed static analysis errors in parse.dart and save_file.dart.
• Improved package metadata for pub.dev.

• Initial Release of the community fork.
• Forked from excel
• Updated minimum Dart SDK to 3.6.0
• Migrate from dart:html to package:web
• Update packages to latest versions
• Added support for charts