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applied HTML pagebreaks patch

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@20617 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Václav Slavík
2003-05-12 22:33:51 +00:00
parent 6769d0cbf3
commit f2034f1b6e
7 changed files with 172 additions and 39 deletions
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164
src/html/m_layout.cpp
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@@ -31,6 +31,101 @@
FORCE_LINK_ME(m_layout)
#include <stdlib.h> // bsearch()
//-----------------------------------------------------------------------------
// wxHtmlPageBreakCell
//-----------------------------------------------------------------------------
// Since html isn't a page-layout language, it doesn't support page
// page breaks directly--that requires CSS2 support. But a page-break
// facility is handy, and has been requested more than once on the
// mailing lists. This wxHtml tag handler implements just enough of
// CSS2 to support a page break by recognizing only
// <div style="page-break-before:always">
//
// wxHtml maintains page breaks in wxHtmlPrintout::m_PageBreaks. The
// tag handler below adds appropriate offsets to that array member.
// wxHtmlDCRenderer::Render() accesses that array and makes a new page
// begin after each page-break tag.
// The page-break handler does all its work in AdjustPagebreak(). For
// all tag handlers, that function adjusts the page-break position.
// For other tags, it determines whether the html element can fit on
// the remainder of the page; if it cannot fit, but must not be split,
// then the function moves the page break provided in the argument up,
// and returns 'true' to inform the caller that the argument was
// modified.
//
// Due to its special purpose, the page-break facility differs from
// other tags. It takes up no space, but it behaves as though there is
// never enough room to fit it on the remainder of the page--it always
// forces a page break. Therefore, unlike other elements that trigger
// a page break, it would never 'fit' on the following page either.
// Therefore it's necessary to compare each pagebreak candidate to the
// array wxHtmlPrintout::m_PageBreaks of pagebreaks already set, and
// set a new one only if it's not in that array.
class WXDLLEXPORT wxHtmlPageBreakCell : public wxHtmlCell
{
public:
wxHtmlPageBreakCell() {}
bool AdjustPagebreak(int* pagebreak, int* known_pagebreaks = NULL, int number_of_pages = 0) const;
private:
DECLARE_NO_COPY_CLASS(wxHtmlPageBreakCell)
};
// Comparison routine for bsearch into an int* array of pagebreaks.
static int integer_compare(void const* i0, void const* i1)
{
return *(int*)i0 - *(int*)i1;
}
bool wxHtmlPageBreakCell::AdjustPagebreak(int* pagebreak, int* known_pagebreaks, int number_of_pages) const
{
// When we are counting pages, 'known_pagebreaks' is non-NULL.
// That's the only time we change 'pagebreak'. Otherwise, pages
// were already counted, 'known_pagebreaks' is NULL, and we don't
// do anything except return FALSE.
//
// We also simply return FALSE if the 'pagebreak' argument is
// less than (vertically above) or the same as the current
// vertical position. Otherwise we'd be setting a pagebreak above
// the current cell, which is incorrect, or duplicating a
// pagebreak that has already been set.
if(NULL == known_pagebreaks || *pagebreak <= m_PosY)
{
return FALSE;
}
// m_PosY is only the vertical offset from the parent. The pagebreak
// required here is the total page offset, so m_PosY must be added
// to the parent's offset and height.
int total_height = m_PosY + GetParent()->GetPosY() + GetParent()->GetHeight();
// Search the array of pagebreaks to see whether we've already set
// a pagebreak here. The standard bsearch() function is appropriate
// because the array of pagebreaks through known_pagebreaks[number_of_pages]
// is known to be sorted in strictly increasing order. '1 + number_of_pages'
// is used as a bsearch() argument because the array contains a leading
// zero plus one element for each page.
int* where = (int*) bsearch(&total_height, known_pagebreaks,
1 + number_of_pages, sizeof(int),
integer_compare);
// Add a pagebreak only if there isn't one already set here.
if(NULL != where)
{
return FALSE;
}
else
{
*pagebreak = m_PosY;
return TRUE;
}
}
TAG_HANDLER_BEGIN(P, "P")
TAG_HANDLER_PROC(tag)
@@ -110,34 +205,57 @@ TAG_HANDLER_BEGIN(DIV, "DIV")
TAG_HANDLER_PROC(tag)
{
int old = m_WParser->GetAlign();
wxHtmlContainerCell *c = m_WParser->GetContainer();
if (c->GetFirstCell() != NULL)
if(tag.HasParam("STYLE"))
{
m_WParser->CloseContainer();
m_WParser->OpenContainer();
c = m_WParser->GetContainer();
c->SetAlign(tag);
m_WParser->SetAlign(c->GetAlignHor());
if(tag.GetParam("STYLE").IsSameAs(wxString("PAGE-BREAK-BEFORE:ALWAYS"), FALSE))
{
m_WParser->CloseContainer();
m_WParser->OpenContainer()->InsertCell(new wxHtmlPageBreakCell);
m_WParser->CloseContainer();
m_WParser->OpenContainer();
return FALSE;
}
else
{
// Treat other STYLE parameters here when they're supported.
return FALSE;
}
}
else if(tag.HasParam("ALIGN"))
{
int old = m_WParser->GetAlign();
wxHtmlContainerCell *c = m_WParser->GetContainer();
if (c->GetFirstCell() != NULL)
{
m_WParser->CloseContainer();
m_WParser->OpenContainer();
c = m_WParser->GetContainer();
c->SetAlign(tag);
m_WParser->SetAlign(c->GetAlignHor());
}
else
{
c->SetAlign(tag);
m_WParser->SetAlign(c->GetAlignHor());
}
ParseInner(tag);
m_WParser->SetAlign(old);
if (c->GetFirstCell() != NULL)
{
m_WParser->CloseContainer();
m_WParser->OpenContainer();
}
else
c->SetAlignHor(old);
return TRUE;
}
else
{
c->SetAlign(tag);
m_WParser->SetAlign(c->GetAlignHor());
return FALSE;
}
ParseInner(tag);
m_WParser->SetAlign(old);
if (c->GetFirstCell() != NULL)
{
m_WParser->CloseContainer();
m_WParser->OpenContainer();
}
else
c->SetAlignHor(old);
return TRUE;
}
TAG_HANDLER_END(DIV)