[Qt-interest] [MVC] Can signals connect / disconnect dynamically to reduce overhead on GUI thread?

[Thomas McGuire]

Hi,

On Tuesday 29 November 2011 06:05:25 Ed Sutton wrote:
> I am seeking design advice.
> 
> My GUI is similar to the Windows File or Nautilus file explorer with a
> split windows interface; the left-pane selects the item to browse and the
> right-pane displays views of static and dynamic data.  There could be
> hundreds of network devices in the left-pane tree view.  My concern is the
> overhead of all these signal callbacks will overwhelm the GUI performance
> if connected to all of them.  Can signals be connected to and disconnected
> dynamically to reduce the callback overhead on the GUI thread?
> 
> [..]
> 
> I am thinking I should use the Model View Controller (MVC) pattern.  I am
> just not sure if the Qt disconnect is meant to be used this way?

Using the model view framework in Qt is a good idea. This will solve your 
problem automatically, since there is just a single signal when an item is 
clicked, in your case that would be QTreeView::clicked(const QModelIndex &). 
So there is one single signal for all items, so no overhead related to too 
many connections.

Regards,
Thomas
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