Qt-interest Archive, May 2007
[Qt4.3] QTableView::setIndexWidget() (...and its position...)
Message 1 in thread
I'm using QTableView to display data from a custom
MyModel. I needed lots of rendering control for the
last column, so MyDelegate calls
QTableView::setIndexWidget() with instances of
MyCustomWidget.
Everything works fine, until the user resizes the
columns: MyCustomWidget continues to paint in its
previous location, and not in the location to where
its column was moved. When I reset the model,
however, all the index widgets "snap" to their correct
location in the column.
I can catch the QHeaderView::sectionResized() to
physically move my index widgets during/after the
column resizing, but shouldn't the index widget's
placement/painting happen automatically? And, don't
the index widgets logically exist in their "cells" ...
so to where should I move them?
I think I'm missing some important understanding of
*what* these index widgets are, for what purpose, and
how they are to be used. (Yes, I read the docs and
understand that they are intended for "read-only"
content within the model.)
Is there some other example or supporting
documentation
that can help me understand QTableView's index
widgets?
Specifically, MyModel has "record-rows", and
MyCustomWidget in the last column (that I'm setting as
the index widget) is *actually* a set of
"rating/date/initials" indicating "sign-off". Each
record has a variable number of "sign-offs" that I
display in (three) fixed columns, wrapping new
sign-offs to logical "rows" within that widget. Thus,
all MyCustomWidget instances have the same width, but
some of them have more "sign-offs" and thus the
widget is "taller". (Of course, QTableView nicely
handles rows of differing heights.)
It seems to work, although my sizeHint/resizing
infrastructure seems kind of klunky/in-elegant to me.
I'm using the QTableView::setIndexWidget() instead
of simply rendering the cell in MyDelegate because
it's slightly interactive (i.e., I needed more than
just an image displayed).
Is my use an abomination of
QTableView::setIndexWidget(), and do you have a
suggestion for a different design? (Logically, I just
want a normal table in my QTableView, except
MyCustomWidget behaves like a nested table.)
Thoughts?
--charley
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