c8ddb6b61d
## Summary * Original implementation had inconsistent positioning logic: - When XPath parsing succeeded: incorrectly set pageNumber = 0 (always beginning of chapter) - When XPath parsing failed: used percentage for positioning (worked correctly) - Result: Positions restored to wrong locations depending on XPath parsing success - Mentioned in Issue #581 * Solution - Unified ProgressMapper::toCrossPoint() to use percentage-based positioning exclusively for both spine identification and intra-chapter page calculation, eliminating unreliable XPath parsing entirely. ## Additional Context * ProgressMapper.cpp: Simplified toCrossPoint() to always use percentage for positioning, removed parseDocFragmentIndex() function * ProgressMapper.h: Updated comments and removed unused function declaration * Tests confirmed appropriate positioning * __Notabene: the syncing to another device will (most probably) end up at the current chapter of crosspoints reading position. There is not much we can do about it, as KOReader needs to have the correct XPath information - we can only provide an apporximate position (plus percentage) - the percentage information is not used in KOReaders current implementation__ --- ### AI Usage While CrossPoint doesn't have restrictions on AI tools in contributing, please be transparent about their usage as it helps set the right context for reviewers. Did you use AI tools to help write this code? YES
68 lines
2.1 KiB
C++
68 lines
2.1 KiB
C++
#pragma once
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#include <Epub.h>
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#include <memory>
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#include <string>
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/**
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* CrossPoint position representation.
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*/
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struct CrossPointPosition {
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int spineIndex; // Current spine item (chapter) index
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int pageNumber; // Current page within the spine item
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int totalPages; // Total pages in the current spine item
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};
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/**
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* KOReader position representation.
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*/
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struct KOReaderPosition {
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std::string xpath; // XPath-like progress string
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float percentage; // Progress percentage (0.0 to 1.0)
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};
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/**
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* Maps between CrossPoint and KOReader position formats.
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*
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* CrossPoint tracks position as (spineIndex, pageNumber).
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* KOReader uses XPath-like strings + percentage.
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*
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* Since CrossPoint discards HTML structure during parsing, we generate
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* synthetic XPath strings based on spine index, using percentage as the
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* primary sync mechanism.
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*/
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class ProgressMapper {
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public:
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/**
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* Convert CrossPoint position to KOReader format.
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*
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* @param epub The EPUB book
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* @param pos CrossPoint position
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* @return KOReader position
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*/
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static KOReaderPosition toKOReader(const std::shared_ptr<Epub>& epub, const CrossPointPosition& pos);
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/**
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* Convert KOReader position to CrossPoint format.
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*
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* Note: The returned pageNumber may be approximate since different
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* rendering settings produce different page counts.
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*
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* @param epub The EPUB book
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* @param koPos KOReader position
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* @param currentSpineIndex Index of the currently open spine item (for density estimation)
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* @param totalPagesInCurrentSpine Total pages in the current spine item (for density estimation)
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* @return CrossPoint position
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*/
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static CrossPointPosition toCrossPoint(const std::shared_ptr<Epub>& epub, const KOReaderPosition& koPos,
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int currentSpineIndex = -1, int totalPagesInCurrentSpine = 0);
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private:
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/**
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* Generate XPath for KOReader compatibility.
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* Format: /body/DocFragment[spineIndex+1]/body
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* Since CrossPoint doesn't preserve HTML structure, we rely on percentage for positioning.
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*/
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static std::string generateXPath(int spineIndex, int pageNumber, int totalPages);
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};
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