Qt-interest Archive, June 2007
How to set a precise size of QTableWidget to prevent from having scroll bars?
Message 1 in thread
Hi All,
I’m working on QTableWidget, which may or may not have scroll bars.
If my table is in a reasonable size (not too wide, not too tall) I wish
to set a precise size which does not leave extra space in the viewport,
and on the other hand, not having scroll bars show up. What is the
precise size?
I tried:
adjustSize();
and
resizeRowsToContents();
esizeColumnsToContents();
and
resize(size());
or check and resize() base on
QSize size = this->sizeHint();
QSize baseSize = this->baseSize();
None of them works.
By the way, I do not change any size policy, or set any size hint
explicitly, and my table has no delegates.
Thanks
Lingfa
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Message 2 in thread
El Miércoles, 27 de Junio de 2007 18:13, Lingfa Yang escribió:
> Hi All,
>
> I’m working on QTableWidget, which may or may not have scroll bars.
>
> If my table is in a reasonable size (not too wide, not too tall) I wish
> to set a precise size which does not leave extra space in the viewport,
> and on the other hand, not having scroll bars show up. What is the
> precise size?
>
> I tried:
> adjustSize();
> and
> resizeRowsToContents();
> esizeColumnsToContents();
> and
> resize(size());
> or check and resize() base on
> QSize size = this->sizeHint();
> QSize baseSize = this->baseSize();
> None of them works.
>
> By the way, I do not change any size policy, or set any size hint
> explicitly, and my table has no delegates.
>
Try with:
setColumnWidth()
setRowHeight()
setFixedWidth()
setFixedHeight()
If you want some column to stretch, you can try:
horizontalHeader()->setStretchLastSection(true);
horizontalHeader()->setResizeMode(0, QHeaderView::Stretch); // column 0
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Message 3 in thread
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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Those techniques didn't work well for me. A similar question came up
earlier this month. See <a
href="http://lists.trolltech.com/qt-interest/2007-06/msg00887.html#msg00887";>http://lists.trolltech.com/qt-interest/2007-06/msg00887.html#msg00887</a><br>
<br>
<br>
Manuel Parrilla wrote:
<blockquote cite="mid:200706271851.40472.mparrilla@xxxxxxx"; type="cite">
<pre wrap="">El Miércoles, 27 de Junio de 2007 18:13, Lingfa Yang escribió:
</pre>
<blockquote type="cite">
<pre wrap="">Hi All,
I’m working on QTableWidget, which may or may not have scroll bars.
If my table is in a reasonable size (not too wide, not too tall) I wish
to set a precise size which does not leave extra space in the viewport,
and on the other hand, not having scroll bars show up. What is the
precise size?
I tried:
adjustSize();
and
resizeRowsToContents();
esizeColumnsToContents();
and
resize(size());
or check and resize() base on
QSize size = this->sizeHint();
QSize baseSize = this->baseSize();
None of them works.
By the way, I do not change any size policy, or set any size hint
explicitly, and my table has no delegates.
</pre>
</blockquote>
<pre wrap=""><!---->Try with:
setColumnWidth()
setRowHeight()
setFixedWidth()
setFixedHeight()
If you want some column to stretch, you can try:
horizontalHeader()->setStretchLastSection(true);
horizontalHeader()->setResizeMode(0, QHeaderView::Stretch); // column 0
</pre>
</blockquote>
</body>
</html>
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Message 4 in thread
Susan Macchia wrote:
> Those techniques didn't work well for me. A similar question came up
> earlier this month. See
> http://lists.trolltech.com/qt-interest/2007-06/msg00887.html#msg00887
>
Hi Susan,
Yes. it is the question, where I saw your way to calculate the width:
columnWidth() is ok, but verticalHeader()->width() does not work after
setVerticalHeaderLabels().
verticalHeader()->width() return 15 if rowCount<10 even through I have
a much longer string in the vertical header which takes 200 pixels.
Do you have more idea?
Thanks,
Lingfa
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Message 5 in thread
Are you calling ::resizeColumnToContents first?
Rather than setVerticalHeaderLabels, I have a QTableView derivation that
is implementing the ::headerData method. Perhaps you can convert to a
TableView-Model-Delegate?
Lingfa Yang wrote:
> Susan Macchia wrote:
>
>> Those techniques didn't work well for me. A similar question came up
>> earlier this month. See
>> http://lists.trolltech.com/qt-interest/2007-06/msg00887.html#msg00887
>>
> Hi Susan,
>
> Yes. it is the question, where I saw your way to calculate the width:
> columnWidth() is ok, but verticalHeader()->width() does not work after
> setVerticalHeaderLabels().
>
> verticalHeader()->width() return 15 if rowCount<10 even through I
> have a much longer string in the vertical header which takes 200 pixels.
>
> Do you have more idea?
>
> Thanks,
> Lingfa
>
>
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Message 6 in thread
Susan Macchia wrote:
> Are you calling ::resizeColumnToContents first?
>
Call it or not both works fine if I does not setVerticalHeaderLabels.
> Rather than setVerticalHeaderLabels, I have a QTableView derivation
> that is implementing the ::headerData method. Perhaps you can convert
> to a TableView-Model-Delegate?
>
I finally find the trick: after setVerticalHeaderLabels() if I add
tableWidget->resize(1,1); // It can be any size.
then, verticalHeader()->width() returns a correct value, and a precise
size of tableWidget can be calculated.
Problem solved!
Thanks for your help.
Lingfa
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Message 7 in thread
> I finally find the trick: after setVerticalHeaderLabels() if I add
>
> tableWidget->resize(1,1); // It can be any size.
>
> then, verticalHeader()->width() returns a correct value, and a precise
> size of tableWidget can be calculated.
An expert points to me that problem comes from size is not calculated
after setVerticalHeaderLabels().
A way to solve it is hide-and-show like this:
int before = verticalHeader()->width(); // not correct!
hide(); show(); // hide-and-show to trigger size calculation
int after = verticalHeader()->width(); // it is correct now!
Lingfa
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Message 8 in thread
This looks "kludgey" to me (IMHO), though I'm sure it works. Is there
another way to tell the widget to perform size calculation.
Lingfa Yang wrote:
>
>> I finally find the trick: after setVerticalHeaderLabels() if I add
>>
>> tableWidget->resize(1,1); // It can be any size.
>>
>> then, verticalHeader()->width() returns a correct value, and a
>> precise size of tableWidget can be calculated.
>
> An expert points to me that problem comes from size is not calculated
> after setVerticalHeaderLabels().
> A way to solve it is hide-and-show like this:
>
> int before = verticalHeader()->width(); // not correct!
> hide(); show(); // hide-and-show to trigger size calculation
> int after = verticalHeader()->width(); // it is correct now!
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