Qt-interest Archive, December 2006
[Qt4.2] QAbstractItemView::setIndexWidget()
Message 1 in thread
Qt4.1 added QAbstractItemView::setIndexWidget(), but the
documentation is a bit slim and I'm having a hard time
getting it to work (here's the docs:)
<http://doc.trolltech.com/4.1/qabstractitemview.html#setIndexWidget>
Is there documentation or discussion somewhere for how to use
QAbstractItemView::setIndexWidget()? (I couldn't find anything
in the Qt docs or a Google search.)
I implement MyTableView (derived from QTableView) and want one
column to display formatted text. I couldn't figure out how to do
that elegantly inside MyDelegate::paint() (e.g., you apparently can't
QPixmap::grabWidget(QLabel) inside a paint event), so I wanted to call
MyTableView::setIndexWidget() with a "QLabel" that displays
the formatted text.
I then overrode MyTableView::rowsInserted() to call "setIndexWidget()"
with a new QLabel on the added rows. It very quickly "blinks" the
formatted text, and then the view apparently uses the default
MyDelegate::paint() to draw the cell where I set the index widget
(instead of relying on the widget I set for the cell).
I'd *hoped* the setIndexWidget() would cause the widget to display
the (read-only) interface for that cell. Isn't that how it's supposed to
work? Are there examples somewhere?
--charley
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Message 2 in thread
<snip, how to use QAbstractItemView::setIndexWidget()>
Ok, I found a good thread in the archives talking about
trouble-shooting options with setIndexWidget():
<http://lists.trolltech.com/qt-interest/2006-02/thread00097-0.html>
I moved my setIndexWidget() to MyDelegate::paint() as
was done in the thread, and it works. Kinda weird --
the docs should be updated to tell us where it's intended
that we place that call.
Now, I have another problem: Because I setIndexWidget()
to get rich text rendering (works great), the user can no
longer trigger editing operations on that cell (i.e.,
MyItemDelegate::createEditor() never gets called for
that cell). Apparently, the "edit" events are filtered out
because that cell has a read-only widget, and I can't
find an intercept to turn it back on.
I thought my goal/expectation was reasonable:
(1) Display (read-only) formatted text in the cell
(accomplished through setIndexWidget())
(2) Upon an edit event (e.g., double-click), createEditor()
to present a QTextEdit for the user to edit.
I can get *EITHER* to work, but not both at the same
time. Huh? Ideas?
Can I explicitly trigger an "edit" operation on that cell
(for example, if I "connect()" a double-click on the QLabel
in my setIndexWidget() to the "trigger-an-edit")?
BONUS QUESTION:
My "formatted text" is actually:
"some text <u>_link_</u> some text"
...and, I'd like the link to apear like a hyper-link (e.g.,
I'd like to pop up a dialog if the user clicks on the underlined
"link text", as if it were a hyperlink). Ideas on how to do this?
(This should conform to the "read-only" expectation of the
setIndexWidget(), and seems like a clean/elegant user
interface, so it seems like you should be able to do this...)
--charley
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Message 3 in thread
On 23.12.06 16:56:52, Charley Bay wrote:
> Can I explicitly trigger an "edit" operation on that cell
> (for example, if I "connect()" a double-click on the QLabel
> in my setIndexWidget() to the "trigger-an-edit")?
Sure, there's a public slot on QAbstractItemView that is called "edit".
As for the double-click signal, I'd try QAbstractItemView::doubleClicked
;)
> My "formatted text" is actually:
>
> "some text <u>_link_</u> some text"
>
> ...and, I'd like the link to apear like a hyper-link (e.g.,
> I'd like to pop up a dialog if the user clicks on the underlined
> "link text", as if it were a hyperlink). Ideas on how to do this?
Use "<a href="something">linktext</a>" and connect a slot to the labels
linkActivated signal. Shouldn't be too hard.
Andreas
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Message 4 in thread
Charley Bay wrote:
>> Can I explicitly trigger an "edit" operation on that cell
>> (for example, if I "connect()" a double-click on the QLabel
>> in my setIndexWidget() to the "trigger-an-edit")?
Andreas responded:
>Sure, there's a public slot on QAbstractItemView that is called "edit".
>As for the double-click signal, I'd try QAbstractItemView::doubleClicked
>;)
I saw the "edit", but then I'd have to do *all* the edit
work (I wanted to use the same pathway already
coded for createEditor()/setEditorData()/setModelData()).
Oh, wait -- I guess it's the same work. Oops. ;-)
(I'll try that. ;-))
>> My "formatted text" is actually:
>>
>> "some text <u>_link_</u> some text"
>>
>> ...and, I'd like the link to apear like a hyper-link (e.g.,
>> I'd like to pop up a dialog if the user clicks on the underlined
>> "link text", as if it were a hyperlink). Ideas on how to do this?
>Use "<a href="something">linktext</a>" and connect a slot to the labels
>linkActivated signal. Shouldn't be too hard.
Ooops. I *totally* missed <a href> was supported, and that
QLabel now has a "linkActivated()".
THANKS.
Ok, both my questions are user-error. I'd better go to bed.
Thanks again!
--charley
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