/////////////////////////////////////////////////////////////////////////////
-// Name: m_layout.cpp
+// Name: src/html/m_layout.cpp
// Purpose: wxHtml module for basic paragraphs/layout handling
// Author: Vaclav Slavik
// RCS-ID: $Id$
// Copyright: (c) 1999 Vaclav Slavik
-// Licence: wxWindows Licence
+// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
-#ifdef __GNUG__
-#pragma implementation
-#endif
#include "wx/wxprec.h"
+#ifdef __BORLANDC__
+ #pragma hdrstop
+#endif
-#include "wx/defs.h"
#if wxUSE_HTML && wxUSE_STREAMS
-#ifdef __BORDLANDC__
-#pragma hdrstop
-#endif
-#ifndef WXPRECOMP
+#ifndef WX_PRECOMP
+ #include "wx/image.h"
#endif
-
#include "wx/html/forcelnk.h"
#include "wx/html/m_templ.h"
FORCE_LINK_ME(m_layout)
+#ifdef __WXWINCE__
+ #include "wx/msw/wince/missing.h" // for bsearch()
+#else
+ #include <stdlib.h> // bsearch()
+#endif
+
+//-----------------------------------------------------------------------------
+// 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 wxHtmlPageBreakCell : public wxHtmlCell
+{
+public:
+ wxHtmlPageBreakCell() {}
+
+ bool AdjustPagebreak(int* pagebreak,
+ wxArrayInt& known_pagebreaks) const;
+
+ void Draw(wxDC& WXUNUSED(dc),
+ int WXUNUSED(x), int WXUNUSED(y),
+ int WXUNUSED(view_y1), int WXUNUSED(view_y2),
+ wxHtmlRenderingInfo& WXUNUSED(info)) {}
+
+private:
+ wxDECLARE_NO_COPY_CLASS(wxHtmlPageBreakCell);
+};
+
+bool wxHtmlPageBreakCell::AdjustPagebreak(int* pagebreak, wxArrayInt& known_pagebreaks) 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( known_pagebreaks.GetCount() == 0 || *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;
+ for ( wxHtmlCell *parent = GetParent(); parent; parent = parent->GetParent() )
+ {
+ total_height += parent->GetPosY();
+ }
+
+
+ // Search the array of pagebreaks to see whether we've already set
+ // a pagebreak here.
+ int where = known_pagebreaks.Index( total_height);
+ // Add a pagebreak only if there isn't one already set here.
+ if( wxNOT_FOUND != where)
+ {
+ return false;
+ }
+ else
+ {
+ *pagebreak = m_PosY;
+ return true;
+ }
+}
+
+
TAG_HANDLER_BEGIN(P, "P")
+ TAG_HANDLER_CONSTR(P) { }
TAG_HANDLER_PROC(tag)
{
- if (m_WParser->GetContainer()->GetFirstCell() != NULL)
+ if (m_WParser->GetContainer()->GetFirstChild() != NULL)
{
m_WParser->CloseContainer();
m_WParser->OpenContainer();
}
m_WParser->GetContainer()->SetIndent(m_WParser->GetCharHeight(), wxHTML_INDENT_TOP);
m_WParser->GetContainer()->SetAlign(tag);
- return FALSE;
+ return false;
}
TAG_HANDLER_END(P)
TAG_HANDLER_BEGIN(BR, "BR")
+ TAG_HANDLER_CONSTR(BR) { }
TAG_HANDLER_PROC(tag)
{
c->SetAlignHor(al);
c->SetAlign(tag);
c->SetMinHeight(m_WParser->GetCharHeight());
- return FALSE;
+ return false;
}
TAG_HANDLER_END(BR)
TAG_HANDLER_BEGIN(CENTER, "CENTER")
+ TAG_HANDLER_CONSTR(CENTER) { }
TAG_HANDLER_PROC(tag)
{
wxHtmlContainerCell *c = m_WParser->GetContainer();
m_WParser->SetAlign(wxHTML_ALIGN_CENTER);
- if (c->GetFirstCell() != NULL)
+ if (c->GetFirstChild() != NULL)
{
m_WParser->CloseContainer();
m_WParser->OpenContainer();
ParseInner(tag);
m_WParser->SetAlign(old);
- if (c->GetFirstCell() != NULL)
+ if (c->GetFirstChild() != NULL)
{
m_WParser->CloseContainer();
m_WParser->OpenContainer();
else
c->SetAlignHor(old);
- return TRUE;
+ return true;
}
- else return FALSE;
+ else return false;
}
TAG_HANDLER_END(CENTER)
TAG_HANDLER_BEGIN(DIV, "DIV")
+ TAG_HANDLER_CONSTR(DIV) { }
TAG_HANDLER_PROC(tag)
{
- int old = m_WParser->GetAlign();
- wxHtmlContainerCell *c = m_WParser->GetContainer();
- if (c->GetFirstCell() != NULL)
+ if(tag.HasParam(wxT("STYLE")))
{
- m_WParser->CloseContainer();
- m_WParser->OpenContainer();
- c = m_WParser->GetContainer();
- c->SetAlign(tag);
- m_WParser->SetAlign(c->GetAlignHor());
+ if(tag.GetParam(wxT("STYLE")).IsSameAs(wxT("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
+ else if(tag.HasParam(wxT("ALIGN")))
{
- c->SetAlign(tag);
- m_WParser->SetAlign(c->GetAlignHor());
- }
+ int old = m_WParser->GetAlign();
+ wxHtmlContainerCell *c = m_WParser->GetContainer();
+ if (c->GetFirstChild() != 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);
+ ParseInner(tag);
- m_WParser->SetAlign(old);
- if (c->GetFirstCell() != NULL)
- {
- m_WParser->CloseContainer();
- m_WParser->OpenContainer();
+ m_WParser->SetAlign(old);
+ if (c->GetFirstChild() != NULL)
+ {
+ m_WParser->CloseContainer();
+ m_WParser->OpenContainer();
+ }
+ else
+ c->SetAlignHor(old);
+
+ return true;
}
else
- c->SetAlignHor(old);
+ {
+ // Same as BR
+ int al = m_WParser->GetContainer()->GetAlignHor();
+ wxHtmlContainerCell *c;
- return TRUE;
+ m_WParser->CloseContainer();
+ c = m_WParser->OpenContainer();
+ c->SetAlignHor(al);
+ c->SetAlign(tag);
+ c->SetMinHeight(m_WParser->GetCharHeight());
+ return false;
+ }
}
TAG_HANDLER_END(DIV)
TAG_HANDLER_BEGIN(TITLE, "TITLE")
+ TAG_HANDLER_CONSTR(TITLE) { }
TAG_HANDLER_PROC(tag)
{
- if (m_WParser->GetWindow())
+ wxHtmlWindowInterface *winIface = m_WParser->GetWindowInterface();
+ if (winIface)
{
- wxHtmlWindow *wfr = (wxHtmlWindow*)(m_WParser->GetWindow());
- if (wfr)
+ wxString title(tag.GetBeginIter(), tag.GetEndIter1());
+#if !wxUSE_UNICODE
+ const wxFontEncoding enc = m_WParser->GetInputEncoding();
+ if ( enc != wxFONTENCODING_DEFAULT )
{
- const wxString& src = *m_WParser->GetSource();
- wfr->OnSetTitle(src.Mid(tag.GetBeginPos(),
- tag.GetEndPos1()-tag.GetBeginPos()));
+ // need to convert to the current one
+ title = wxString(title.wc_str(wxCSConv(enc)), wxConvLocal);
}
+#endif // !wxUSE_UNICODE
+
+ title = m_WParser->GetEntitiesParser()->Parse(title);
+
+ winIface->SetHTMLWindowTitle(title);
}
- return TRUE;
+ return true;
}
TAG_HANDLER_END(TITLE)
TAG_HANDLER_BEGIN(BODY, "BODY")
+ TAG_HANDLER_CONSTR(BODY) { }
TAG_HANDLER_PROC(tag)
{
if (tag.GetParamAsColour(wxT("LINK"), &clr))
m_WParser->SetLinkColor(clr);
+ wxHtmlWindowInterface *winIface = m_WParser->GetWindowInterface();
+ // the rest of this function requires a window:
+ if ( !winIface )
+ return false;
+
+ if (tag.HasParam(wxT("BACKGROUND")))
+ {
+ wxFSFile *fileBgImage = m_WParser->OpenURL
+ (
+ wxHTML_URL_IMAGE,
+ tag.GetParam(wxT("BACKGROUND"))
+ );
+ if ( fileBgImage )
+ {
+ wxInputStream *is = fileBgImage->GetStream();
+ if ( is )
+ {
+ wxImage image(*is);
+ if ( image.IsOk() )
+ winIface->SetHTMLBackgroundImage(image);
+ }
+
+ delete fileBgImage;
+ }
+ }
+
if (tag.GetParamAsColour(wxT("BGCOLOR"), &clr))
{
m_WParser->GetContainer()->InsertCell(
new wxHtmlColourCell(clr, wxHTML_CLR_BACKGROUND));
- if (m_WParser->GetWindow() != NULL)
- m_WParser->GetWindow()->SetBackgroundColour(clr);
+ winIface->SetHTMLBackgroundColour(clr);
}
- return FALSE;
+
+ return false;
}
TAG_HANDLER_END(BODY)
TAG_HANDLER_BEGIN(BLOCKQUOTE, "BLOCKQUOTE")
+ TAG_HANDLER_CONSTR(BLOCKQUOTE) { }
TAG_HANDLER_PROC(tag)
{
c->SetIndent(m_WParser->GetCharHeight(), wxHTML_INDENT_BOTTOM);
m_WParser->CloseContainer();
m_WParser->OpenContainer();
- return TRUE;
+ return true;
}
TAG_HANDLER_END(BLOCKQUOTE)
+TAG_HANDLER_BEGIN(SUBSUP, "SUB,SUP")
+
+ TAG_HANDLER_PROC(tag)
+ {
+ bool issub = (tag.GetName() == wxT("SUB"));
+ wxHtmlScriptMode oldmode = m_WParser->GetScriptMode();
+ int oldbase = m_WParser->GetScriptBaseline();
+ int oldsize = m_WParser->GetFontSize();
+
+ wxHtmlContainerCell *cont = m_WParser->GetContainer();
+ wxHtmlCell *c = cont->GetLastChild();
+
+ m_WParser->SetScriptMode(issub ? wxHTML_SCRIPT_SUB : wxHTML_SCRIPT_SUP);
+ m_WParser->SetScriptBaseline(
+ oldbase + c ? c->GetScriptBaseline() : 0);
+
+ // select smaller font
+ m_WParser->SetFontSize(m_WParser->GetFontSize()-2);
+ cont->InsertCell(new wxHtmlFontCell(m_WParser->CreateCurrentFont()));
+
+ ParseInner(tag);
+
+ // restore font size
+ m_WParser->SetFontSize(oldsize);
+ m_WParser->GetContainer()->InsertCell(
+ new wxHtmlFontCell(m_WParser->CreateCurrentFont()));
+
+ // restore base and alignment
+ m_WParser->SetScriptBaseline(oldbase);
+ m_WParser->SetScriptMode(oldmode);
+
+ return true;
+ }
+
+TAG_HANDLER_END(SUBSUP)
+
+
+// Tag handler for tags that we have to ignore, otherwise non-text data
+// would show up as text:
+TAG_HANDLER_BEGIN(DoNothing, "SCRIPT")
+ TAG_HANDLER_CONSTR(DoNothing) { }
+
+ TAG_HANDLER_PROC(WXUNUSED(tag))
+ {
+ return true;
+ }
+TAG_HANDLER_END(DoNothing)
+
+
TAGS_MODULE_ADD(TITLE)
TAGS_MODULE_ADD(BODY)
TAGS_MODULE_ADD(BLOCKQUOTE)
+ TAGS_MODULE_ADD(SUBSUP)
+ TAGS_MODULE_ADD(DoNothing)
TAGS_MODULE_END(Layout)
projects / wxWidgets.git / blobdiff