Page Comparison

By default, when users click the “Print” button in the previewer toolbar (), the Print method of the XFCont class is called. This method displays a dialog box with a printer selection and allows for entering a page range:

When a XFF file is previewed, the corresponding XFRX#DRAW reference is accessible via oXFRXWriter property of the previewer class instance.

If you would like to change the way the previewer reacts to the print event, you can either setup an extension handler (please see Registering an extension handler paragraph above in this chapter for more information) . There are three events that extension handler can implement:

Name	Description
Print	This method is called when the Print button is clicked in the toolbar.
BeforePrintOptions	This method is called before the Printer Options dialog is opened.
PrintOptions	This method is called after the Printer Options dialog is closed,
BeforePrint	This method is called before the PrintDocument() method.
AfterPrint	This method is called after the PrintDocument() method.

The print parameter object has the following methods:

17.0.017.0.0

Name	Desccription	XFRX version
ReadDEVMODE	Read DEVMODE data for selected printer by PrinterName property.
SetField	Set field of DEVMODE data for selected printer by PrinterName property. Parameters: tcField – Field name, such as "DM_COLOR", "DM_PRINTQUALITY" etc. tuValue – Fields' value

The print parameter object has the following properties:

Name	Type	Desccription
AllOddEven	number	Include all pages, odd or even only.
Copies	number	The number of copies.
Zoom	number	The number of pages per sheet.
lShowDialog	boolean	Specifies whether a XFRX call "Print options" dialog.
PrinterName	string	The name of the printer to which the document will be sent.
PageRange	string	Enter page numbers and/or page ranges.
cDevmode	string	DEVMODE structure.
lPrint	boolean	Specifies whether a XFRX call PrintDocument() method.
cOutputFile	string	Output file name for XPS Microsoft Document Writer or another PDF virtual driver.
aFindString	array	A array contains strings for highlight.
oWM	object	Watermark object.
oEffect	object	Effect object
UnderlinehyperlinksOnPrint	number	Hyperlin decoration.

The printer job name generated by the Print method is stored in cJobName property of the XFCont class and can be changed both in design time and runtime. (The default value is “XFRX”).

See also: Printing XFF files chapter on page 46 for more information about printing the content of XFF files.

Extension handler examples

Code Block

USE invoices 
ORDER customer 
LOCAL m.loSession, m.lnRetval, m.loXFF, m.loPreview, m.loScripts 
m.loSession=EVALUATE([xfrx("XFRX#LISTENER")]) 
m.lnRetVal = m.loSession.SetParams("",,,,,,"XFF") && no name = just in memory 
IF m.lnRetVal = 0 
   REPORT FORM invoices OBJECT m.loSession 
   m.loXFF = m.loSession.oxfDocument 
   * 
   * initialize the previewer 
   * SET CLASSLIB TO xfrxlib ADDITIVE 
   m.loPreview = CREATEOBJECT("frmMPPreviewer") 
   m.loPreview.setExtensionHandler(CREATEOBJECT("MyExtensionHandler")) 
   m.loPreview.windowType = 0 
   m.loPreview.iBook = 0 
   m.loPreview.PreviewXFF(loXFF) 
   m.loPreview.show(1) 
ENDIF 

DEFINE CLASS MyExtensionHandler AS Custom 

   PROCEDURE BeforePrintOptions 
      LPARAMETERS m.toXFF, m.loOpt
      m.loOpt.Copies=2 && new default value 
      RETURN .T.
      *RETURN .F. && XFRX cancel printing document - "Print options" dialog was not call
    ENDPROC

   PROCEDURE PrintOptions 
      LPARAMETERS m.toXFF, m.loOpt
      DEBUGOUT m.loOpt.PrinterName && log printer name
      m.loOpt.Copies=MAX(m.loOpt.Copies, 5) && cutomer can print only five copies
      RETURN .T.
      *RETURN .F. && XFRX cancel printing document
   ENDPROC
ENDDEFINE

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The print parameter object has the following methods:

The print parameter object has the following properties:

Extension handler examples