AuroraMiddleware/qt5base-lts
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Update the signal and slots docs

Browse Source 
This lifts the documentation into a more recent context. One might
argue that Qt is a little bit older too.

Change-Id: I3e85f21bbad1179136629c2025e3499481fc8334
Task-number: QTBUG-16809
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>
This commit is contained in:
Alex Blasche 2014-10-01 13:54:36 +02:00
parent 24edd8afdc
commit 9c464c3bf4
1 changed files with 4 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
src/corelib/doc/src/objectmodel/signalsandslots.qdoc
View File

@ -49,17 +49,14 @@
if a user clicks a \uicontrol{Close} button, we probably want the if a user clicks a \uicontrol{Close} button, we probably want the
window's \l{QWidget::close()}{close()} function to be called. window's \l{QWidget::close()}{close()} function to be called.
Older toolkits achieve this kind of communication using Other toolkits achieve this kind of communication using
callbacks. A callback is a pointer to a function, so if you want callbacks. A callback is a pointer to a function, so if you want
a processing function to notify you about some event you pass a a processing function to notify you about some event you pass a
pointer to another function (the callback) to the processing pointer to another function (the callback) to the processing
function. The processing function then calls the callback when function. The processing function then calls the callback when
appropriate. Callbacks have two fundamental flaws: Firstly, they appropriate. While successful frameworks using this method do exist,
are not type-safe. We can never be certain that the processing callbacks can be unintuitive and may suffer from problems in ensuring
function will call the callback with the correct arguments. the type-correctness of callback arguments.
Secondly, the callback is strongly coupled to the processing
function since the processing function must know which callback
to call.
\section1 Signals and Slots \section1 Signals and Slots