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revisions of o-p headers contributed by Utensil Candel and revised by me

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@53116 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Francesco Montorsi
2008-04-10 21:16:38 +00:00
parent b3623ed593
commit b1b95a653c
13 changed files with 714 additions and 414 deletions
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477
interface/print.h
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@@ -11,9 +11,10 @@
@wxheader{print.h}
This is the default implementation of the preview control bar, a panel
with buttons and a zoom control. You can derive a new class from this and
override some or all member functions to change the behaviour and appearance;
or you can leave it as it is.
with buttons and a zoom control.
You can derive a new class from this and override some or all member functions
to change the behaviour and appearance; or you can leave it as it is.
@library{wxbase}
@category{printing}
@@ -23,6 +24,35 @@
class wxPreviewControlBar : public wxPanel
{
public:
/**
Constructor.
The @a buttons parameter may be a combination of the following, using the bitwise
'or' operator:
@beginStyleTable
@style{wxPREVIEW_PRINT}:
Create a print button.
@style{wxPREVIEW_NEXT}:
Create a next page button.
@style{wxPREVIEW_PREVIOUS}:
Create a previous page button.
@style{wxPREVIEW_ZOOM}:
Create a zoom control.
@style{wxPREVIEW_DEFAULT}:
Equivalent to a combination of @c wxPREVIEW_PREVIOUS, @c wxPREVIEW_NEXT
and @c wxPREVIEW_ZOOM.
@endStyleTable
*/
wxPreviewControlBar(wxPrintPreview* preview,
long buttons,
wxWindow* parent,
const wxPoint& pos = wxDefaultPosition,
const wxSize& size = wxDefaultSize,
long style = 0,
const wxString& name = "panel");
/**
Destructor.
*/
@@ -48,38 +78,6 @@ public:
*/
void SetZoomControl(int percent);
/**
Constructor.
The buttons parameter may be a combination of the following, using the bitwise
'or' operator.
wxPREVIEW_PRINT
Create a print button.
wxPREVIEW_NEXT
Create a next page button.
wxPREVIEW_PREVIOUS
Create a previous page button.
wxPREVIEW_ZOOM
Create a zoom control.
wxPREVIEW_DEFAULT
Equivalent to a combination of wxPREVIEW_PREVIOUS, wxPREVIEW_NEXT and
wxPREVIEW_ZOOM.
*/
wxPreviewControlBar(wxPrintPreview* preview, long buttons,
wxWindow* parent,
const wxPoint& pos = wxDefaultPosition,
const wxSize& size = wxDefaultSize,
long style = 0,
const wxString& name = "panel");
};
@@ -114,7 +112,7 @@ public:
~wxPreviewCanvas();
/**
Calls wxPrintPreview::PaintPage to refresh the canvas.
Calls wxPrintPreview::PaintPage() to refresh the canvas.
*/
void OnPaint(wxPaintEvent& event);
};
@@ -138,7 +136,9 @@ class wxPreviewFrame : public wxFrame
{
public:
/**
Constructor. Pass a print preview object plus other normal frame arguments.
Constructor.
Pass a print preview object plus other normal frame arguments.
The print preview object will be destroyed by the frame when it closes.
*/
wxPreviewFrame(wxPrintPreview* preview, wxWindow* parent,
@@ -154,14 +154,18 @@ public:
~wxPreviewFrame();
/**
Creates a wxPreviewCanvas. Override this function to allow
a user-defined preview canvas object to be created.
Creates a wxPreviewCanvas.
Override this function to allow a user-defined preview canvas object
to be created.
*/
void CreateCanvas();
/**
Creates a wxPreviewControlBar. Override this function to allow
a user-defined preview control bar object to be created.
Creates a wxPreviewControlBar.
Override this function to allow a user-defined preview control bar object
to be created.
*/
void CreateControlBar();
@@ -169,6 +173,7 @@ public:
Creates the preview canvas and control bar, and calls
wxWindow::MakeModal(@true) to disable other top-level windows
in the application.
This function should be called by the application prior to
showing the frame.
*/
@@ -191,42 +196,45 @@ public:
Objects of this class manage the print preview process. The object is passed
a wxPrintout object, and the wxPrintPreview object itself is passed to
a wxPreviewFrame object. Previewing is started by initializing and showing
the preview frame. Unlike wxPrinter::Print, flow of control returns to the
application
immediately after the frame is shown.
the preview frame. Unlike wxPrinter::Print(), flow of control returns to the
application immediately after the frame is shown.
@library{wxbase}
@category{printing}
@see @ref overview_printingoverview "Printing framework overview", wxPrinterDC,
wxPrintDialog, wxPrintout, wxPrinter, wxPreviewCanvas, wxPreviewControlBar, wxPreviewFrame.
@see @ref overview_printing "Printing framework overview", wxPrinterDC,
wxPrintDialog, wxPrintout, wxPrinter, wxPreviewCanvas, wxPreviewControlBar,
wxPreviewFrame.
*/
class wxPrintPreview : public wxObject
{
public:
/**
Constructor. Pass a printout object, an optional printout object to be
used for actual printing, and the address of an optional
block of printer data, which will be copied to the print preview object's
print data.
Constructor.
Pass a printout object, an optional printout object to be used for actual
printing, and the address of an optional block of printer data, which will
be copied to the print preview object's print data.
If @a printoutForPrinting is non-@NULL, a @b Print... button will be placed on
the
preview frame so that the user can print directly from the preview interface.
the preview frame so that the user can print directly from the preview interface.
@remarks
Do not explicitly delete the printout objects once this destructor has been
called, since they will be deleted in the wxPrintPreview constructor.
The same does not apply to the @a data argument.
Test the Ok member to check whether the wxPrintPreview object was created
Test the Ok() to check whether the wxPrintPreview object was created
correctly.
Ok could return @false if there was a problem initializing the printer device
context
(current printer not set, for example).
*/
wxPrintPreview(wxPrintout* printout,
wxPrintout* printoutForPrinting,
wxPrintData* data = NULL);
/**
Destructor. Deletes both print preview objects, so do not destroy these objects
Destructor.
Deletes both print preview objects, so do not destroy these objects
in your application.
*/
~wxPrinter();
@@ -270,16 +278,17 @@ public:
wxPrintout* GetPrintoutForPrinting();
/**
Returns @true if the wxPrintPreview is valid, @false otherwise. It could return
@false if there was a
problem initializing the printer device context (current printer not set, for
example).
Returns @true if the wxPrintPreview is valid, @false otherwise.
It could return @false if there was a problem initializing the printer
device context (current printer not set, for example).
*/
bool Ok();
/**
This refreshes the preview window with the preview image.
It must be called from the preview window's OnPaint member.
The implementation simply blits the preview bitmap onto
the canvas, creating a new preview bitmap if none exists.
*/
@@ -290,9 +299,9 @@ public:
supplied in the wxPrintPreview constructor.
Will normally be called by the @b Print... panel item on the
preview frame's control bar.
Returns @false in case of error -- call
wxPrinter::GetLastError to get detailed
information about the kind of the error.
Returns @false in case of error -- call wxPrinter::GetLastError()
to get detailed information about the kind of the error.
*/
bool Print(bool prompt);
@@ -336,24 +345,25 @@ public:
@wxheader{print.h}
This class represents the Windows or PostScript printer, and is the vehicle
through
which printing may be launched by an application. Printing can also
be achieved through using of lower functions and classes, but
this and associated classes provide a more convenient and general
method of printing.
through which printing may be launched by an application.
Printing can also be achieved through using of lower functions and classes,
but this and associated classes provide a more convenient and general method
of printing.
@library{wxbase}
@category{printing}
@see @ref overview_printingoverview "Printing framework overview", wxPrinterDC,
@see @ref overview_printing "Printing framework overview", wxPrinterDC,
wxPrintDialog, wxPrintout, wxPrintPreview.
*/
class wxPrinter : public wxObject
{
public:
/**
Constructor. Pass an optional pointer to a block of print
dialog data, which will be copied to the printer object's local data.
Constructor.
Pass an optional pointer to a block of print dialog data, which will be
copied to the printer object's local data.
@see wxPrintDialogData, wxPrintData
*/
@@ -370,52 +380,48 @@ public:
bool GetAbort();
/**
Return last error. Valid after calling Print(),
PrintDialog() or
wxPrintPreview::Print. These functions
set last error to @b wxPRINTER_NO_ERROR if no error happened.
Return last error. Valid after calling Print(), PrintDialog() or
wxPrintPreview::Print().
These functions set last error to @c wxPRINTER_NO_ERROR if no error
happened.
Returned value is one of the following:
@b wxPRINTER_NO_ERROR
No error happened.
@b wxPRINTER_CANCELLED
The user cancelled printing.
@b wxPRINTER_ERROR
There was an error during printing.
@beginTable
@row2col{wxPRINTER_NO_ERROR,No error happened.}
@row2col{wxPRINTER_CANCELLED,The user cancelled printing.}
@row2col{wxPRINTER_ERROR,There was an error during printing.}
@endTable
*/
static wxPrinterError GetLastError();
/**
Returns the @ref overview_wxprintdata "print data" associated with the printer
object.
Returns the @ref overview_printing_printdata "print data" associated with
the printer object.
*/
wxPrintDialogData GetPrintDialogData();
wxPrintDialogData& GetPrintDialogData();
/**
Starts the printing process. Provide a parent window, a user-defined wxPrintout
object which controls
the printing of a document, and whether the print dialog should be invoked
first.
Print could return @false if there was a problem initializing the printer device
context
(current printer not set, for example) or the user cancelled printing. Call
GetLastError() to get detailed
information about the kind of the error.
object which controls the printing of a document, and whether the print dialog
should be invoked first.
Print() could return @false if there was a problem initializing the printer device
context (current printer not set, for example) or the user cancelled printing.
Call GetLastError() to get detailed information about the kind of the error.
*/
bool Print(wxWindow* parent, wxPrintout* printout,
bool prompt = true);
/**
Invokes the print dialog. If successful (the user did not press Cancel
and no error occurred), a suitable device context will be returned
(otherwise @NULL is returned -- call
GetLastError() to get detailed
information about the kind of the error).
Invokes the print dialog.
If successful (the user did not press Cancel and no error occurred),
a suitable device context will be returned;
otherwise @NULL is returned -- call GetLastError() to get detailed
information about the kind of the error.
@remarks
The application must delete this device context to avoid a memory leak.
*/
wxDC* PrintDialog(wxWindow* parent);
@@ -427,8 +433,11 @@ public:
const wxString& message);
/**
Invokes the print setup dialog. Note that the setup dialog is obsolete from
Windows 95, though retained for backward compatibility.
Invokes the print setup dialog.
@remarks
The setup dialog is obsolete from Windows 95, though retained
for backward compatibility.
*/
bool Setup(wxWindow* parent);
};
@@ -439,10 +448,11 @@ public:
@class wxPrintout
@wxheader{print.h}
This class encapsulates the functionality of printing out an application
document. A new class must be derived and members overridden to respond to calls
such as OnPrintPage and HasPage and to render the print image onto an associated
wxDC. Instances of this class are passed to wxPrinter::Print or
This class encapsulates the functionality of printing out an application document.
A new class must be derived and members overridden to respond to calls such as
OnPrintPage() and HasPage() and to render the print image onto an associated wxDC.
Instances of this class are passed to wxPrinter::Print() or
to a wxPrintPreview object to initiate printing or previewing.
Your derived wxPrintout is responsible for drawing both the preview image and
@@ -464,16 +474,17 @@ public:
@library{wxbase}
@category{printing}
@see @ref overview_printingoverview "Printing framework overview", wxPrinterDC,
@see @ref overview_printing "Printing framework overview", wxPrinterDC,
wxPrintDialog, wxPageSetupDialog, wxPrinter, wxPrintPreview
*/
class wxPrintout : public wxObject
{
public:
/**
Constructor. Pass an optional title argument - the current filename would be a
good idea. This will appear in the printing list
(at least in MSW)
Constructor.
Pass an optional title argument - the current filename would be a
good idea. This will appear in the printing list (at least in MSW)
*/
wxPrintout(const wxString& title = "Printout");
@@ -485,23 +496,28 @@ public:
/**
Set the user scale and device origin of the wxDC associated with this wxPrintout
so that the given image size fits entirely within the page rectangle and the
origin is at the top left corner of the page rectangle. On MSW and Mac, the page
rectangle is the printable area of the page. On other platforms and PostScript
printing, the page rectangle is the entire paper. Use this if you want your
printed image as large as possible, but with the caveat that on some platforms,
portions of the image might be cut off at the edges.
origin is at the top left corner of the page rectangle.
On MSW and Mac, the page rectangle is the printable area of the page.
On other platforms and PostScript printing, the page rectangle is the entire paper.
Use this if you want your printed image as large as possible, but with the caveat
that on some platforms, portions of the image might be cut off at the edges.
*/
void FitThisSizeToPage(const wxSize& imageSize);
/**
Set the user scale and device origin of the wxDC associated with this wxPrintout
so that the given image size fits entirely within the page margins set in the
given wxPageSetupDialogData object. This function provides the greatest
consistency across all platforms because it does not depend on having access to
the printable area of the paper. Note that on Mac, the native wxPageSetupDialog
does not let you set the page margins; you'll have to provide your own
mechanism,
or you can use the Mac-only class wxMacPageMarginsDialog.
given wxPageSetupDialogData object.
This function provides the greatest consistency across all platforms because it
does not depend on having access to the printable area of the paper.
@remarks
On Mac, the native wxPageSetupDialog does not let you set the page margins;
you'll have to provide your own mechanism, or you can use the Mac-only class
wxMacPageMarginsDialog.
*/
void FitThisSizeToPageMargins(const wxSize& imageSize,
const wxPageSetupDialogData& pageSetupData);
@@ -509,103 +525,147 @@ public:
/**
Set the user scale and device origin of the wxDC associated with this wxPrintout
so that the given image size fits entirely within the paper and the origin is at
the top left corner of the paper. Note that with most printers, the region
around the edges of the paper are not printable so that the edges of the image
could be cut off. Use this if you're managing your own page margins.
the top left corner of the paper.
Use this if you're managing your own page margins.
@note
With most printers, the region around the edges of the paper are not
printable so that the edges of the image could be cut off.
*/
void FitThisSizeToPaper(const wxSize& imageSize);
/**
Returns the device context associated with the printout (given to the printout
at start of
printing or previewing). This will be a wxPrinterDC if printing under Windows
or Mac,
a wxPostScriptDC if printing on other platforms, and a wxMemoryDC if previewing.
at start of printing or previewing).
The application can use GetDC() to obtain a device context to draw on.
This will be a wxPrinterDC if printing under Windows or Mac, a wxPostScriptDC
if printing on other platforms, and a wxMemoryDC if previewing.
*/
wxDC* GetDC();
/**
Return the rectangle corresponding to the page margins specified by the given
wxPageSetupDialogData object in the associated wxDC's logical coordinates for
the
current user scale and device origin. The page margins are specified
with respect to the edges of the paper on all platforms.
the current user scale and device origin.
The page margins are specified with respect to the edges of the paper on all
platforms.
*/
wxRect GetLogicalPageMarginsRect(const wxPageSetupDialogData& pageSetupData);
/**
Return the rectangle corresponding to the page in the associated wxDC's
Return the rectangle corresponding to the page in the associated wxDC 's
logical coordinates for the current user scale and device origin.
On MSW and Mac, this will be the printable area of the paper. On other platforms
and PostScript printing, this will be the full paper rectangle.
On MSW and Mac, this will be the printable area of the paper.
On other platforms and PostScript printing, this will be the full paper
rectangle.
*/
wxRect GetLogicalPageRect();
/**
Return the rectangle corresponding to the paper in the associated wxDC's
Return the rectangle corresponding to the paper in the associated wxDC 's
logical coordinates for the current user scale and device origin.
*/
wxRect GetLogicalPaperRect();
/**
Returns the number of pixels per logical inch of the printer device context.
Dividing the printer PPI by the screen PPI can give a suitable scaling factor
for drawing text onto the printer. Remember to multiply this by a scaling factor
to take the preview DC size into account. Or you can just use the
FitThisSizeToXXX() and MapScreenSizeToXXX routines below, which do most of the
scaling calculations for you.
for drawing text onto the printer.
Remember to multiply this by a scaling factor to take the preview DC size into
account.
Or you can just use the FitThisSizeToXXX() and MapScreenSizeToXXX routines below,
which do most of the scaling calculations for you.
@beginWxPythonOnly
This method returns the output-only parameters as a tuple.
@endWxPythonOnly
*/
void GetPPIPrinter(int* w, int* h);
/**
Returns the number of pixels per logical inch of the screen device context.
Dividing the printer PPI by the screen PPI can give a suitable scaling factor
for drawing text onto the printer. If you are doing your own scaling, remember
to multiply this by a scaling factor to take the preview DC size into account.
for drawing text onto the printer.
If you are doing your own scaling, remember to multiply this by a scaling
factor to take the preview DC size into account.
@beginWxPythonOnly
This method returns the output-only parameters as a tuple.
@endWxPythonOnly
*/
void GetPPIScreen(int* w, int* h);
/**
Called by the framework to obtain information from the application about minimum
and maximum page values that the user can select, and the required page range to
be printed. By default this returns 1, 32000 for the page minimum and maximum
values, and 1, 1 for the required page range.
be printed.
By default this returns (1, 32000) for the page minimum and maximum values, and
(1, 1) for the required page range.
If @a minPage is zero, the page number controls in the print dialog will be
disabled.
@beginWxPythonOnly
When this method is implemented in a derived Python class, it should be designed
to take no parameters (other than the self reference) and to return a tuple of
four integers.
@endWxPythonOnly
*/
void GetPageInfo(int* minPage, int* maxPage, int* pageFrom,
int* pageTo);
/**
Returns the size of the printer page in millimetres.
@beginWxPythonOnly
This method returns the output-only parameters as a tuple.
@endWxPythonOnly
*/
void GetPageSizeMM(int* w, int* h);
/**
Returns the size of the printer page in pixels, called the page rectangle.
The page rectangle has a top left corner at (0,0) and a bottom right corner at
(w,h). These values may not be the same as the values returned from
wxDC::GetSize; if the printout is being used for
wxDC::GetSize(); if the printout is being used for
previewing, a memory device context is used, which uses a bitmap size reflecting
the current preview zoom. The application must take this discrepancy into
account if previewing is to be supported.
@beginWxPythonOnly
This method returns the output-only parameters as a tuple.
@endWxPythonOnly
*/
void GetPageSizePixels(int* w, int* h);
/**
Returns the rectangle that corresponds to the entire paper in pixels, called the
paper rectangle. This distinction between paper rectangle and page
rectangle reflects the fact that most printers cannot print all the way to the
edge of the paper. The page rectangle is a rectangle whose top left corner is at
(0,0) and whose width and height are given by
wxDC::GetPageSizePixels. On MSW and Mac,
the page rectangle gives the printable area of the paper, while the paper
rectangle represents the entire paper, including non-printable borders. Thus,
the rectangle returned by GetPaperRectPixels will have a top left corner whose
coordinates are small negative numbers and the bottom right corner will have
values somewhat larger than the width and height given by
wxDC::GetPageSizePixels. On other
platforms and for PostScript printing, the paper is treated as if its entire
paper rectangle.
This distinction between paper rectangle and page rectangle reflects the fact that
most printers cannot print all the way to the edge of the paper.
The page rectangle is a rectangle whose top left corner is at (0,0) and whose width
and height are given by wxDC::GetPageSizePixels().
On MSW and Mac, the page rectangle gives the printable area of the paper, while the
paper rectangle represents the entire paper, including non-printable borders.
Thus, the rectangle returned by wxDC::GetPaperRectPixels() will have a top left corner
whose coordinates are small negative numbers and the bottom right corner will have
values somewhat larger than the width and height given by wxDC::GetPageSizePixels().
On other platforms and for PostScript printing, the paper is treated as if its entire
area were printable, so this function will return the same rectangle as the page
rectangle.
*/
@@ -618,7 +678,9 @@ public:
/**
Should be overridden to return @true if the document has this page, or @false
if not. Returning @false signifies the end of the document. By default,
if not.
Returning @false signifies the end of the document. By default,
HasPage behaves as if the document has only one page.
*/
bool HasPage(int pageNum);
@@ -630,32 +692,33 @@ public:
/**
Set the user scale and device origin of the wxDC associated with this wxPrintout
so that one screen pixel maps to one device pixel on the DC. That is, the user
scale is set to (1,1) and the device origin is set to (0,0). Use this if you
want to do your own scaling prior to calling wxDC drawing calls, for example, if
your underlying model is floating-point and you want to achieve maximum drawing
precision on high-resolution printers. (Note that while the underlying drawing
model of Mac OS X is floating-point, wxWidgets's drawing model scales from
integer
coordinates.) You can use the GetLogicalXXXRect() routines below to obtain the
paper rectangle, page rectangle, or page margins rectangle to perform your own
scaling.
so that one screen pixel maps to one device pixel on the DC.
That is, the user scale is set to (1,1) and the device origin is set to (0,0).
Use this if you want to do your own scaling prior to calling wxDC drawing calls,
for example, if your underlying model is floating-point and you want to achieve
maximum drawing precision on high-resolution printers.
You can use the GetLogicalXXXRect() routines below to obtain the paper rectangle,
page rectangle, or page margins rectangle to perform your own scaling.
@note
While the underlying drawing model of Mac OS X is floating-point,
wxWidgets's drawing model scales from integer coordinates.
*/
void MapScreenSizeToDevice();
/**
This sets the user scale of the wxDC assocated with this wxPrintout to the same
scale as MapScreenSizeToPaper() but sets
the logical origin to the top left corner of the page rectangle.
scale as MapScreenSizeToPaper() but sets the logical origin to the top left corner
of the page rectangle.
*/
void MapScreenSizeToPage();
/**
This sets the user scale of the wxDC assocated with this wxPrintout to the same
scale as
MapScreenSizeToPageMargins() but
sets the logical origin to the top left corner of the page margins specified by
the given wxPageSetupDialogData object.
scale as MapScreenSizeToPageMargins() but sets the logical origin to the top left
corner of the page margins specified by the given wxPageSetupDialogData object.
*/
void MapScreenSizeToPageMargins(const wxPageSetupDialogData& pageSetupData);
@@ -663,12 +726,12 @@ public:
Set the user scale and device origin of the wxDC associated with this wxPrintout
so that the printed page matches the screen size as closely as possible
and the logical origin is in the top left corner of the paper rectangle.
That is,
a 100-pixel object on screen should appear at the same size on the printed
page. (It
will, of course, be larger or smaller in the preview image, depending on the
zoom
factor.) Use this if you want WYSIWYG behavior, e.g., in a text editor.
That is, a 100-pixel object on screen should appear at the same size on the printed
page.
(It will, of course, be larger or smaller in the preview image, depending on the
zoom factor.)
Use this if you want WYSIWYG behavior, e.g., in a text editor.
*/
void MapScreenSizeToPaper();
@@ -679,46 +742,60 @@ public:
/**
Called by the framework at the start of document printing. Return @false from
this function cancels the print job. OnBeginDocument is called once for every
copy printed.
The base OnBeginDocument() @e must be called (and the return value
checked) from within the overridden function, since it calls wxDC::StartDoc.
this function cancels the print job.
OnBeginDocument() is called once for every copy printed.
@remarks
The base OnBeginDocument() must be called (and the return value
checked) from within the overridden function, since it calls wxDC::StartDoc().
@beginWxPythonOnly
If this method is overridden in a Python class then the base class version can
be called by using the method <tt>base_OnBeginDocument(startPage, endPage)</tt>.
@endWxPythonOnly
*/
bool OnBeginDocument(int startPage, int endPage);
/**
Called by the framework at the start of printing. OnBeginPrinting is called
once for every
print job (regardless of how many copies are being printed).
Called by the framework at the start of printing.
OnBeginPrinting() is called once for every print job
(regardless of how many copies are being printed).
*/
void OnBeginPrinting();
/**
Called by the framework at the end of document printing. OnEndDocument
is called once for every copy printed.
The base OnEndDocument() @e must be called
from within the overridden function, since it calls wxDC::EndDoc.
Called by the framework at the end of document printing.
OnEndDocument() is called once for every copy printed.
@remarks
The base OnEndDocument() must be called from within the overridden function,
since it calls wxDC::EndDoc().
*/
void OnEndDocument();
/**
Called by the framework at the end of printing. OnEndPrinting
is called once for every print job (regardless of how many copies are being
printed).
Called by the framework at the end of printing.
OnEndPrinting is called once for every print job
(regardless of how many copies are being printed).
*/
void OnEndPrinting();
/**
Called once by the framework before any other demands are made of the
wxPrintout object. This gives the object an opportunity to calculate the
number of pages in the document, for example.
wxPrintout object.
This gives the object an opportunity to calculate the number of pages
in the document, for example.
*/
void OnPreparePrinting();
/**
Called by the framework when a page should be printed. Returning @false cancels
the print job. The application can use GetDC() to obtain a device
context to draw on.
the print job.
*/
bool OnPrintPage(int pageNum);