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List:       kde-perl
Subject:    [Kde-perl] Why isn't this easy? implementing File->New
From:       Joe Carlson <joe () fruitfly ! org>
Date:       2006-08-01 23:00:58
Message-ID: 1154473258.1691.76.camel () torso ! lbl ! gov
[Download RAW message or body]


I am liking PerlQt. At last, some real widgets that enable access to our
Perl infrastructure. I'm a convert.

Nonetheless, a problem. I'd like to implement a "File->New" menu action
to open a new instance of the main window. In the c++ version, this is
trivial:

void MyView::processFileMenu(int option)
{                                                                                     \
  if (option == FILENEW) {
    MyView *newWindow = new MyView();
    newWindow->show();
  }
...

and that's it. the new window opens and I have an event loop responding
to it.

The corresponding perl version (inside MyView.pm which subclasses
Qt::MainWindow):

package MyView;
...
use constant FILENEW=>1;
...
sub processFileMenu
{
  my $option = shift;
  if ($option == FILENEW) {
    my $newWindow = main::MyView();
    $newWindow->show;
  }
...

is not as successful. I can see from the perl debugger that I am calling
MyView::NEW and I am creating a new instance of the main window. But
nothing shows up on the screen. The X event loop continues to process
events from the original main window.

Am I correct in assuming that I need to invoke the constructor from the
namespace main::? I have been unable to find any other legitimate way to
call it. Are there any alternatives for creating new instances of these
classes directly?

I looked at some of the trace output from the debugger, and I am left
with the impression that there may be some processing that happens only
the first time a module is autoloaded that prevents new instances from
getting processed by the metaObject-izer.

Anyone have a suggestion? I haven't stumbled over the solution yet.

Thanks,

Joe



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