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detect horizontal overflow in wxHtmlPrintout and warn the user about it

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@59862 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin
2009-03-26 13:37:37 +00:00
parent be8dbffa00
commit 4209475ced
4 changed files with 123 additions and 17 deletions
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2
docs/changes.txt
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@@ -514,6 +514,8 @@ All (GUI):
- Add support for wxSP_WRAP in the generic version of wxSpinCtrlDouble.
- Add alignment flags support to wxSpinCtrl[Double] (Andrew Radke).
- Added wxGetSelectedChoices() replacing wxGetMultipleChoices() (Kolya Kosenko).
- Check whether document fits into page horizontally in wxHtmlPrintout, see the
new CheckFit() method for more information.
wxGTK:

17
include/wx/html/htmprint.h
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@@ -80,9 +80,12 @@ public:
int Render(int x, int y, wxArrayInt& known_pagebreaks, int from = 0,
int dont_render = false, int to = INT_MAX);
// returns total width of the html document
int GetTotalWidth() const;
// returns total height of the html document
// (compare Render's return value with this)
int GetTotalHeight();
int GetTotalHeight() const;
private:
wxDC *m_DC;
@@ -169,6 +172,18 @@ public:
static void CleanUpStatics();
private:
// this function is called by the base class OnPreparePrinting()
// implementation and by default checks whether the document fits into
// pageArea horizontally and warns the user if it does not, giving him
// the possibility to cancel printing in this case
//
// you may override it to either suppress this check if truncation of the
// HTML being printed is acceptable or, on the contrary, add more checks to
// it, e.g. for the fit in the vertical direction if the document should
// always appear on a single page
//
// return true if printing should go ahead or false to cancel it
virtual bool CheckFit(const wxSize& pageArea, const wxSize& docArea) const;
void RenderPage(wxDC *dc, int page);
// renders one page into dc

49
interface/wx/html/htmprint.h
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@@ -25,12 +25,28 @@ public:
wxHtmlDCRenderer();
/**
Returns the height of the HTML text. This is important if area height
(see wxHtmlDCRenderer::SetSize) is smaller that total height and thus
the page cannot fit into it. In that case you're supposed to call
Render() as long as its return value is smaller than GetTotalHeight()'s.
Returns the width of the HTML text in pixels.
This can be compared with the width parameter of SetSize() to check if
the document being printed fits into the page boundary.
@see GetTotalHeight()
@since 2.9.0
*/
int GetTotalHeight();
int GetTotalWidth() const;
/**
Returns the height of the HTML text in pixels.
This is important if area height (see wxHtmlDCRenderer::SetSize) is
smaller that total height and thus the page cannot fit into it. In that
case you're supposed to call Render() as long as its return value is
smaller than GetTotalHeight()'s.
@see GetTotalWidth()
*/
int GetTotalHeight() const;
/**
Renders HTML text to the DC.
@@ -245,6 +261,29 @@ public:
Sets the parent window for dialogs.
*/
void SetParentWindow(wxWindow* window);
private:
/**
Check whether the document fits into the page area.
This function is called by the base class OnPreparePrinting()
implementation and by default checks whether the document fits into
@a pageArea horizontally and warns the user if it does not, giving him
the possibility to cancel printing in this case (presumably in order to
change some layout options and retry it again).
You may override it to either suppress this check if truncation of the
HTML being printed is acceptable or, on the contrary, add more checks to
it, e.g. for the fit in the vertical direction if the document should
always appear on a single page.
@return
@true if wxHtmlPrintout should continue or @false to cancel
printing.
@since 2.9.0
*/
virtual bool CheckFit(const wxSize& pageArea, const wxSize& docArea) const;
};

70
src/html/htmprint.cpp
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@@ -150,11 +150,14 @@ int wxHtmlDCRenderer::Render(int x, int y,
else return GetTotalHeight();
}
int wxHtmlDCRenderer::GetTotalHeight()
int wxHtmlDCRenderer::GetTotalWidth() const
{
if (m_Cells) return m_Cells->GetHeight();
else return 0;
return m_Cells ? m_Cells->GetWidth() : 0;
}
int wxHtmlDCRenderer::GetTotalHeight() const
{
return m_Cells ? m_Cells->GetHeight() : 0;
}
@@ -197,6 +200,40 @@ void wxHtmlPrintout::AddFilter(wxHtmlFilter *filter)
m_Filters.Append(filter);
}
bool
wxHtmlPrintout::CheckFit(const wxSize& pageArea, const wxSize& docArea) const
{
if ( docArea.x > pageArea.x )
{
wxMessageDialog
dlg
(
NULL,
wxString::Format
(
_("The document \"%s\" doesn't fit on the page "
"horizontally and will be truncated if printed.\n"
"\n"
"Would you like to proceed with printing it nevertheless?"),
GetTitle()
),
_("Printing"),
wxYES_NO | wxNO_DEFAULT | wxICON_QUESTION
);
dlg.SetExtendedMessage
(
_("If possible, try changing the layout parameters to "
"make the printout more narrow")
);
dlg.SetYesNoLabels(_("&Print"), _("&Cancel"));
if ( dlg.ShowModal() != wxYES )
return false;
}
return true;
}
void wxHtmlPrintout::OnPreparePrinting()
{
int pageWidth, pageHeight, mm_w, mm_h, scr_w, scr_h, dc_w, dc_h;
@@ -248,15 +285,28 @@ void wxHtmlPrintout::OnPreparePrinting()
/* prepare main renderer: */
m_Renderer->SetDC(GetDC(), (double)ppiPrinterY / (double)ppiScreenY);
m_Renderer->SetSize((int) (ppmm_h * (mm_w - m_MarginLeft - m_MarginRight)),
(int) (ppmm_v * (mm_h - m_MarginTop - m_MarginBottom) -
m_FooterHeight - m_HeaderHeight -
((m_HeaderHeight == 0) ? 0 : m_MarginSpace * ppmm_v) -
((m_FooterHeight == 0) ? 0 : m_MarginSpace * ppmm_v)
));
const int printAreaW = int(ppmm_h * (mm_w - m_MarginLeft - m_MarginRight));
int printAreaH = int(ppmm_v * (mm_h - m_MarginTop - m_MarginBottom));
if ( m_HeaderHeight )
printAreaH -= m_HeaderHeight + m_MarginSpace * ppmm_v;
if ( m_FooterHeight )
printAreaH -= m_FooterHeight + m_MarginSpace * ppmm_v;
m_Renderer->SetSize(printAreaW, printAreaH);
m_Renderer->SetHtmlText(m_Document, m_BasePath, m_BasePathIsDir);
if ( CheckFit(wxSize(printAreaW, printAreaH),
wxSize(m_Renderer->GetTotalWidth(),
m_Renderer->GetTotalHeight())) )
{
// do paginate the document
CountPages();
}
//else: if we don't call CountPages() m_PageBreaks remains empty and our
// GetPageInfo() will return 0 as max page and so nothing will be
// printed
}
bool wxHtmlPrintout::OnBeginDocument(int startPage, int endPage)
{