Qt-interest Archive, August 2007
Sizing columns in QTreeView/QHeaderView (model/view)
Message 1 in thread
I'm trying to get my tree view column widths to be initially "properly"
space based on the lengths of the strings in the header and data fields.
I would also like to allow the user to re-size the column widths after
initial layout if, for whatever reason, they don't like the initial
"proper"
spacing.
So far, I've only been able to get one of "user re-sizable" or "properly
spaced" to work. Not both. Is there any way to get both?
I found the following information in the QHeaderView documentation:
void QHeaderView::setResizeMode(ResizeMode mode)
void QHeaderView::setResizeMode(int logicalIndex,ResizeMode mode)
enum QHeaderView::ResizeMode
The resize mode specifies the behavior of the header sections. It
can be set on the entire header view or on individual sections using
setResizeMode().
Constant Value Description
-------------------------------------------------------------------------------
QHeaderView::Interactive 0 The user can resize the section. The
section can
also be resized programmatically using
resizeSection(). The section size defaults to
defaultSectionSize. (See also
cascadingSectionResizes.)
QHeaderView::Fixed 2 The user cannot resize the section. The
section
can only be resized programmatically using
resizeSection(). The section size defaults to
defaultSectionSize.
QHeaderView::Stretch 1 QHeaderView will automatically resize the
section
to fill the available space. The size
cannot be
changed by the user or programmatically.
QHeaderView:ResizeToContents 3 QHeaderView will automatically resize the
section to its optimal size based on the
contents of the entire column or row. The
size
cannot be changed by the user or
programmatically. (This value was introduced
in 4.2)
If I use QHeaderView:ResizeToContents, I get the columns to be well spaced
but then the user can't change them.
It sure would be nice if there was a:
QHeaderView:ResizeToContentsButUserModifiable resize mode.
But since there isn't, is there any other way to get the behavior I want?
--
[ signature omitted ]
Message 2 in thread
You may want QHeaderView::Interactive plus a persist data. Together,
they work nicely.
headerView->setResizeMode(QHeaderView::Interactive);
// Load
int size = getSectionSize(); // retrieve from DOM
if(size != -1) headerView->resizeSection(0, size);
// save
saveSectionSize(headerView->sectionSize(0)); // save to DOM, then to file
Cheers,
Lingfa
Peter Hackett wrote:
> I'm trying to get my tree view column widths to be initially "properly"
> space based on the lengths of the strings in the header and data fields.
> I would also like to allow the user to re-size the column widths after
> initial layout if, for whatever reason, they don't like the initial
> "proper"
> spacing.
>
> So far, I've only been able to get one of "user re-sizable" or "properly
> spaced" to work. Not both. Is there any way to get both?
>
> I found the following information in the QHeaderView documentation:
>
> void QHeaderView::setResizeMode(ResizeMode mode)
> void QHeaderView::setResizeMode(int logicalIndex,ResizeMode mode)
> enum QHeaderView::ResizeMode
> The resize mode specifies the behavior of the header sections. It
> can be set on the entire header view or on individual sections using
> setResizeMode().
> Constant Value Description
> -------------------------------------------------------------------------------
>
> QHeaderView::Interactive 0 The user can resize the section. The
> section can
> also be resized programmatically using
> resizeSection(). The section size
> defaults to
> defaultSectionSize. (See also
> cascadingSectionResizes.)
> QHeaderView::Fixed 2 The user cannot resize the section. The
> section
> can only be resized programmatically using
> resizeSection(). The section size
> defaults to
> defaultSectionSize.
> QHeaderView::Stretch 1 QHeaderView will automatically resize
> the section
> to fill the available space. The size
> cannot be
> changed by the user or programmatically.
> QHeaderView:ResizeToContents 3 QHeaderView will automatically resize the
> section to its optimal size based on the
> contents of the entire column or row.
> The size
> cannot be changed by the user or
> programmatically. (This value was
> introduced
> in 4.2)
>
> If I use QHeaderView:ResizeToContents, I get the columns to be well
> spaced
> but then the user can't change them.
>
> It sure would be nice if there was a:
> QHeaderView:ResizeToContentsButUserModifiable resize mode.
>
> But since there isn't, is there any other way to get the behavior I want?
>
> --
> To unsubscribe - send a mail to qt-interest-request@xxxxxxxxxxxxx with
> "unsubscribe" in the subject or the body.
> List archive and information: http://lists.trolltech.com/qt-interest/
>
--
[ signature omitted ]
Message 3 in thread
"Peter Hackett" <peter@xxxxxxxxxxxx> wrote in message
news:46D8572A.6000707@xxxxxxxxxxxxxxx
> I'm trying to get my tree view column widths to be initially "properly"
> space based on the lengths of the strings in the header and data fields.
> I would also like to allow the user to re-size the column widths after
> initial layout if, for whatever reason, they don't like the initial
> "proper"
> spacing.
>
> So far, I've only been able to get one of "user re-sizable" or "properly
> spaced" to work. Not both. Is there any way to get both?
>
> I found the following information in the QHeaderView documentation:
You can call the function QTreeView::resizeColumnToContents(int)
when filling the tree. Then the user can resize by dragging the headers
around.
I don't think there's a setting to do this automatically though.
--
[ signature omitted ]
