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Jakub Melka
2020-12-11 18:59:39 +01:00
parent 11ad8f2821
commit dc55950050
13 changed files with 856 additions and 18 deletions
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50
PdfForQtLib/sources/pdftextlayout.h
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@ -395,13 +395,55 @@ private:
PDFTextBlocks m_blocks;
};
/// Cache for storing single text layout
class PDFFORQTLIBSHARED_EXPORT PDFTextLayoutCache
{
public:
explicit PDFTextLayoutCache(std::function<PDFTextLayout(PDFInteger)> textLayoutGetter);
/// Clears the cache
void clear();
/// Returns text layout. This function always succeeds. If compiler is not active,
/// then empty layout is returned.
/// \param compiler Text layout compiler
/// \param pageIndex Page index
const PDFTextLayout& getTextLayout(PDFInteger pageIndex);
private:
std::function<PDFTextLayout(PDFInteger)> m_textLayoutGetter;
PDFInteger m_pageIndex;
PDFTextLayout m_layout;
};
class PDFFORQTLIBSHARED_EXPORT PDFTextLayoutGetter
{
public:
explicit inline PDFTextLayoutGetter(PDFTextLayoutCache* cache, PDFInteger pageIndex) :
m_cache(cache),
m_pageIndex(pageIndex)
{
}
/// Cast operator, casts to constant reference to PDFTextLayout
operator const PDFTextLayout&()
{
return m_cache->getTextLayout(m_pageIndex);
}
private:
PDFTextLayoutCache* m_cache;
PDFInteger m_pageIndex;
};
/// Lazy getter for text layouts from storage. This is used, when we do not want to
/// get text layout each time, because it is time expensive. If text layout is not needed,
/// then nothing happens. Text layout is returned only, if conversion operator is used.
class PDFTextLayoutGetter
class PDFTextLayoutStorageGetter
{
public:
explicit PDFTextLayoutGetter(const PDFTextLayoutStorage* storage, PDFInteger pageIndex) :
explicit PDFTextLayoutStorageGetter(const PDFTextLayoutStorage* storage, PDFInteger pageIndex) :
m_storage(storage),
m_pageIndex(pageIndex)
{
@ -411,7 +453,7 @@ public:
/// Cast operator, casts to constant reference to PDFTextLayout
operator const PDFTextLayout&()
{
return m_textLayout.get(this, &PDFTextLayoutGetter::getTextLayoutImpl);
return m_textLayout.get(this, &PDFTextLayoutStorageGetter::getTextLayoutImpl);
}
private:
@ -471,7 +513,7 @@ public:
/// then empty text layout is returned. Function is not thread safe, if
/// function \p setTextLayout is called from another thread.
/// \param pageIndex Page index
PDFTextLayoutGetter getTextLayoutLazy(PDFInteger pageIndex) const { return PDFTextLayoutGetter(this, pageIndex); }
PDFTextLayoutStorageGetter getTextLayoutLazy(PDFInteger pageIndex) const { return PDFTextLayoutStorageGetter(this, pageIndex); }
/// Sets text layout to the particular index. Index must be valid and from
/// range 0 to \p pageCount - 1. Function is not thread safe.