You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
41 lines
1.6 KiB
41 lines
1.6 KiB
<h2><a name="abstract">Abstract</a></h2>
|
|
<p>
|
|
Abstract classes are used as base classes. You cannot create
|
|
an instance of an abstract class directly - you need to subclass
|
|
it. In the subclass, you need to overload <i>all</i> of the
|
|
class's <a href="#purevirtual">pure virtual</a> methods. These
|
|
are marked as "pure virtual" in these docs, and are also indicated
|
|
by a " = 0" at the end of the method declaration.
|
|
</p>
|
|
<p>
|
|
If your subclass doesn't overload the pure virtual methods in the
|
|
abstract base class, you won't be able to create an instance of it.
|
|
</p>
|
|
|
|
<h2><a name="purevirtual">pure virtual</a></h2>
|
|
<p>
|
|
Pure virtual methods are members of an <a href="#abstract">abstract</a>
|
|
class (they're what makes the class abstract in the first place). Pure
|
|
virtual methods are nothing more than place holders - there is no code
|
|
associated with them
|
|
</p>
|
|
|
|
|
|
<h2><a name="variables">variables</a></h2>
|
|
<p>
|
|
Class variables can be read and written from Python. Global or static
|
|
variables are <i>read only</i>. Variables that are "protected" or.
|
|
"private" in C++ are not implemented.
|
|
</p>
|
|
|
|
<h2><a name="slots">slots</a></h2>
|
|
<p>
|
|
When using Qt or KDE in C++, methods involving connections to slots
|
|
take 2 arguments: a QObject 'receiver' and a char* 'slot' name. In Python
|
|
you only need to provide a single value - the name of a Python callable
|
|
method or function which will be connected to a signal. The method or
|
|
function does not need to be in the class where it is reference, and does
|
|
not have to be in a class at all. There are other options - see the
|
|
"Signals and Slots" documentation for more information.
|
|
</p>
|