[Qt-interest] small QDataWidgetMapper/QSelectionModel annoyance

[Israel Brewster]

I have an interface set up with two panes: a QListView on one side,  
and a QTextEdit on the other. I am using a QDataWidgetMapper to map a  
Model field to the QTextEdit, the QListView simply displays one of the  
model columns (same model). In order to update the QDataWidgetMapper  
(and, thus, the QTextEdit) when an item in the QListView is chosen, I  
have the following code:

QItemSelectionModel *selectedNote=notesList->selectionModel();
connect 
(selectedNote 
,SIGNAL 
(currentChanged 
(QModelIndex 
,QModelIndex)),&noteMapper,SLOT(setCurrentModelIndex(QModelIndex)));

this all works properly (noteMapper is my QDataWidgetMapper). The  
problem I am running into is with the intial state. I want it to start  
up with nothing selected in the QListView, and the QTextEdit being  
empty (i.e. QDataWidgetMapper::currentIndex()==-1) So as the last line  
of my constructor I put in:

selectedNote->setCurrentIndex(QModelIndex(),QItemSelectionModel::Clear);

and then checked in the debugger that everything was populated as  
desired. This also worked. HOWEVER, upon the window being shown, I  
found the following:

1) nothing selected in the list view (good)
2) the QTextEdit populated with the first item (bad)
3) the QSelectionModel positioned with the current index being the  
first item of the QListView, as indicated by the fact the  
currentChanged signal is not emitted when clicking the first item in  
the QListView (bad)

Number two and three would imply (to me at least) that somehow the  
currentChanged signal of the selectionModel was emitted AFTER the  
constructor ran, with the currentIndex being set to the first item in  
the QListView - probably when I called show(). This is not the  
behavior I want. How can I either a) prevent the signal from being  
emitted (if this is, in fact, what is going on) or b) reset everything  
as the final action? I suppose I could kludge the second option  
together by making a public "reset" function that I could call after  
calling show, but that is kludgier than I would like if I could avoid  
it. Thanks.

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Israel Brewster
Computer Support Technician
Frontier Flying Service Inc.
5245 Airport Industrial Rd
Fairbanks, AK 99709
(907) 450-7250 x293
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