[commonqt-devel] Qt Tutorials

[Stas Boukarev]

Greg Bennett <gwbennett at sentex.ca> writes:

> Hello there,
> I have acquired common-qt and will try to work my way through
> translating the Qt tutorials. [These can be accessed from 
>  http://common-lisp.net/project/commonqt/
> by running down to the Examples paragraph and right-clicking on the
>  Qt tutorial link.]
>
> tutorial1 has me puzzled already.
> Its objective is to create a push button holding dear old Hello World!
>
> The C++ source code shows that its approach is to build the object out
> of sight, and them display it; the translation of tutorial14 (also
> reachable from common-qt's home page) kindly supplied by David
> Lichteblau and Stas Boukarev use clos as the logical improvement on
> c++ classes. I presume that a purpose of the set of tutorials is to
> make one familiar with this way of structuring code.
>
> I am running ccl Version 1.9-r15975M (LinuxX8664) under Linux Mint 14
> (64bit) on an HP box.
>
> Having loaded commonqt, and issued the requisite
> (named-readtables:in-readtable :qt)
> I thought I would see whether I could create the button in the repl
> before dealing with the structuring. Some poking about in Qt's own
> documents [for Qt4.8, since that is the version recommended] led to
>
>  (with-main-window (window (#_new QPushButton "Hello World!")))
>
> This does produce the desired button, with the letter "a" where a title
> would go. It's part of argv0dummy, it seems.
>
> I notice, with some interest, that the Qt c++ code shows a
> result with "t1" as the window's title without any mention of t1 in the
> code itself. 
>
> More poking led me to the function setTitle associated with QWindow,
> which appears to take a QString as argument, and thus to
>  (with-main-window (window (#_new QPushButton "Hello World!"))
>    (#_setTitle window (#_new QString "t1")))
I'm not sure where you found the class QWindow, and even if it existed,
your window is a QPushButton, a subclass of QWidget. And QWidget has the
windowTitle attribute. And commonqt performs automatic marshalling:

(with-main-window (window (#_new QPushButton "Hello World!"))
  (#_setWindowTitle window "Title"))


-- 
With best regards, Stas.