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< td align = "right" valign = "center" > < img src = "logo32.png" align = "right" width = "64" height = "32" border = "0" > < / td > < / tr > < / table > < h1 align = center > Replacing the Print Dialog< / h1 >
[ < a href = "motif-walkthrough-8.html" > Previous: Replacing the View Widget< / a > ]
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[ < a href = "motif-walkthrough-10.html" > Next: Continuing Development< / a > ]
< p > The < em > Print< / em > dialog is the last component in our application that
uses < a href = "motif-extension.html#Motif" > Motif< / a > . The current < tt > Print()< / tt > function does nothing more than
write the plain text to a temporary file, and then executes 'lpr' to
send the text to the printer. Since we will use < a href = "ntqprinter.html" > TQPrinter< / a > , we do not
this function any more, so we remove it. The current < tt > MainWindow::filePrint()< / tt > implementation is removed as well. We will
write a new < tt > MainWindow::filePrint()< / tt > implementation in < tt > mainwindow.ui.h< / tt > .
< p > Note: The steps involved in using the TQPrinter class are beyond the
scope of this walkthrough and will not be discussed here. The
TQPrinter Class Reference, < a href = "ntqsimplerichtext.html" > TQSimpleRichText< / a > Class Reference and the
< a href = "simple-application.html" > Simple Application Walkthrough< / a >
contain information on the use of TQPrinter.
< p > For completeness, the code to initialize a TQPrinter object is included below.
< p >
< pre > < / pre >
< p > < h2 > Using Rich Text for Printing
< / h2 >
< a name = "1" > < / a > < p > TQt provides rich text using a subset of HTML. The TQSimpleRichText
class makes rich-text printing simple. All we need to do is create a
string with the proper format tags inserted at the appropriate
places. For our example, we will keep the printing output similar to
previous versions.
< p > First, we create the format tags that we will use.
< p > < pre > < / pre >
< p > Next we just loop over all pages, appending the page label, contents
and formatting characters to a < tt > printtext< / tt > variable (which is a
< a href = "ntqstring.html" > TQString< / a > ).
< p > < pre > < / pre >
< p > The rest of the < tt > MainWindow::filePrint()< / tt > function is the actual
printing code. Here we simply create a < a href = "ntqsimplerichtext.html" > TQSimpleRichText< / a > object using
the string we created above, and draw this string on the < a href = "ntqprinter.html" > TQPrinter< / a >
object using < a href = "ntqpainter.html" > TQPainter< / a > .
< p > < pre > < / pre >
< p > < h2 > Removing the Dependency on Xt/Motif
< / h2 >
< a name = "2" > < / a > < p > Our application no longer uses any Xt or Motif widgets. We can now
finish removing the dependencies on Xt and Motif.
< p > First, we cleanup the < tt > #include< / tt > statements in < tt > mainwindow.ui.h< / tt > .
< p >
< p > < pre > < / pre > < pre > < / pre >
< p > The < tt > MainWindow::fileNew()< / tt > function uses the < tt > Boolean< / tt > and < tt > False< / tt >
keywords from the Xt library. C++ has these built into the language,
so we use < tt > bool< / tt > and < tt > false< / tt > instead.
< p > The last modification needed to completely remove Xt and Motif from
our application is to stop using the < a href = "qmotif.html" > TQMotif< / a > class. We remove the
qmotif.h < tt > #include< / tt > statement from < tt > todo.cpp< / tt > , and remove the
instantiation from the < tt > main()< / tt > function.
< p > After doing this, we can remove the < tt > -lXm< / tt > and < tt > -lqmotif< / tt > from the
< tt > LIBS< / tt > variable in our project file. Our project file also contains
source and headers for the the old custom Motif widgets previously
used in our application. We remove these as well.
< p > After regenerating the < tt > Makefile< / tt > and building our project, we
confirm that the application works correctly.
< p > [ < a href = "motif-walkthrough-8.html" > Previous: Replacing the View Widget< / a > ]
[ < a href = "motif-walkthrough.html" > Home< / a > ]
[ < a href = "motif-walkthrough-10.html" > Next: Continuing Development< / a > ]
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