Here is a patch file that seems to handle the ExtraSelection cursor() issue. I'll leave it to Richard for a more general solution.
Ryan
P.S> Did the patches for Windows I sent look good?
-----Original Message-----
From: Richard Dale [mailto:rdale at foton.es]
Sent: Friday, February 12, 2010 9:30 AM
To: KDE bindings for other programming languages
Subject: Re: [Kde-bindings] ruby binding and Qt::TextEdit::ExtraSelection
On Thursday 11 February 2010 08:10:54 pm Melton, Ryan wrote:
> Richard -
>
>
>
> I've found the root cause to Jason's problem in the email below, but I'm
> not sure how to fix it. The root cause is that the memory address of a
> class is the same as the memory address of the first data member of that
> class.
>
>
>
> For example from qtextedit.h here is the definition of ExtraSelection:
>
>
>
> struct ExtraSelection
>
> {
>
> QTextCursor cursor;
>
> QTextCharFormat format;
>
> };
>
>
>
> Now here is some ruby code that tries to use it:
>
>
>
> my_object = Qt::TextEdit::ExtraSelection.new
>
> puts my_object.cursor.class
>
>
>
> Fails and returns my_object instead of a new ruby object wrapping the
> Qt::TextCursor.
>
>
>
> But,
>
>
>
> my_object = Qt::TextEdit::ExtraSelection.new
>
> puts my_object.format.class
>
>
>
> Works and returns a Qt::TextCharFormat because format is the second data
> member in the class and has a different memory address from the class
> itself.
>
>
>
> The problem occurs in marshall_basetypes.h : void
> marshall_to_ruby<SmokeClassWrapper>(Marshall *m) when getPointerObject is
> called with a memory address that is the same as the memory address of the
> Qt::TextEdit::ExtraSelection class.
>
>
>
> Any ideas?
That's an interesting bug, but it sounds quite tricky to fix.
If getPointerObject() returns a Ruby instance that isn't of the expected Ruby
class, it sounds as though it should just wrap the C++ instance (QTextCursor
cursor in this case), as another Ruby instance. Then we would need to make
sure that both of the different Ruby instances wrapping different C++ things at
the same address wouldn't try to free it twice when they were garbage
collected.
-- Richard
>
>
>
> From: Thomas, Jason M (Software) [mailto:jmthomas at ball.com]
> Sent: Monday, February 08, 2010 2:40 PM
> To: kde-bindings at kde.org
> Subject: [Kde-bindings] ruby binding and Qt::TextEdit::ExtraSelection
>
>
>
> I'm having problems using Qt::TextEdit::ExtraSelection under ruby. The
> following code shows the problem:
>
>
>
> class MyTextEdit < Qt::TextEdit
>
> def highlight
>
> selection = Qt::TextEdit::ExtraSelection.new
>
> selection.cursor = textCursor()
>
> STDOUT.puts "selection.cursor:#{selection.cursor}
> textCursor:#{textCursor()}"
>
> end
>
> end
>
>
>
> When instantiating MyTextEdit and calling highlight the following output is
> printed:
>
> selection.cursor:#<Qt::TextEdit::ExtraSelection:0x36c1968>
> textCursor:#<Qt::TextCursor:0x36bebd8>
>
>
>
> For some reason when I try to set the cursor property it runs but doesn't
> appear to actually change the underlying property. This class is different
> from most Qt classes in that it doesn't have explicit getter and setter
> methods. I don't know if that is playing a role or not.
>
>
>
> BTW: What I'm trying to accomplish is to highlight and unhighlight
> individual lines in the TextEdit and this looked like the recommended way
> to do it.
>
>
>
> Jason
>
>
>
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