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Qt-interest Archive, January 2008
Table with fixed/stretched columns

Message 1 in thread

Hi all, 

I'm trying to create a table with all except one columns are of fixed size and 
one stretchable column occupying the remaining space. Seems easy at a first 
view: 

#include <QtGui>

int main(int argc, char *argv[])
 {
    QApplication app(argc, argv);

    QStringList columnLabels;
    columnLabels << "C1" << "C2" << "C3" << "C4" << "C5";
    
    QTableWidget *tbl = new QTableWidget(10, columnLabels.size());
    tbl->resize(500,500);
    tbl->setHorizontalHeaderLabels(columnLabels);
    for (int i=0; i<columnLabels.size(); i++)
      if (i != 1){
        tbl->setColumnWidth(i,50);
        tbl->horizontalHeader()->setResizeMode(i,QHeaderView::Fixed);
      }
      else
        tbl->horizontalHeader()->setResizeMode(1,QHeaderView::Stretch);
    
    tbl->show();
    return app.exec();
 } 

But this doesn't work. Only the first column is of size 50, all other columns 
are much wider. What am I doing wrong here?

Thanks for your help

Mathias

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Message 2 in thread

Are you using qt4.3.3? If so, this will be relevant:
http://lists.trolltech.com/qt-interest/2008-01/msg00315.html#msg00315

Cheers,
Peter 

> -----Ursprüngliche Nachricht-----
> Von: Mathias Waack [mailto:Mathias.Waack@xxxxxxxxxx] 
> Gesendet: Donnerstag, 17. Januar 2008 13:20
> An: qt-interest@xxxxxxxxxxxxx
> Betreff: Table with fixed/stretched columns
> 
> Hi all, 
> 
> I'm trying to create a table with all except one columns are 
> of fixed size and 
> one stretchable column occupying the remaining space. Seems 
> easy at a first 
> view: 
> 
> #include <QtGui>
> 
> int main(int argc, char *argv[])
>  {
>     QApplication app(argc, argv);
> 
>     QStringList columnLabels;
>     columnLabels << "C1" << "C2" << "C3" << "C4" << "C5";
>     
>     QTableWidget *tbl = new QTableWidget(10, columnLabels.size());
>     tbl->resize(500,500);
>     tbl->setHorizontalHeaderLabels(columnLabels);
>     for (int i=0; i<columnLabels.size(); i++)
>       if (i != 1){
>         tbl->setColumnWidth(i,50);
>         tbl->horizontalHeader()->setResizeMode(i,QHeaderView::Fixed);
>       }
>       else
>         
> tbl->horizontalHeader()->setResizeMode(1,QHeaderView::Stretch);
>     
>     tbl->show();
>     return app.exec();
>  } 
> 
> But this doesn't work. Only the first column is of size 50, 
> all other columns 
> are much wider. What am I doing wrong here?
> 
> Thanks for your help
> 
> Mathias

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Message 3 in thread

Hi Peter, 

On Thursday 17 January 2008, Peter Prade wrote:
> Are you using qt4.3.3? 

yes rigth, I've forgot to mention. 

> If so, this will be relevant: 
> http://lists.trolltech.com/qt-interest/2008-01/msg00315.html#msg00315

Exactly. Dunno why I haven't found this. Thank you!

Mathias

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Message 4 in thread

Hello All

I am using a dll which have a function which takes char * as input for the
path of the file (With out the file name ) and char * for a file name.

As i am using QT 4.3.1. I used QFileDialog so as to allow user to select
the file from the window.
It is explained by code below.

QFileDialog *fileSelect = new QFileDialog(0,"Choose file for importing
",path);

fileSelect->setFileMode(QFileDialog::ExistingFiles);

if(fileSelect->exec() != QDialog::Accepted)return;

QStringList fileNames = fileSelect->selectedFiles();

QString fileName = fileNames.first();

if(fileName.isEmpty()) return;

QFileInfo filePath = fileName;

*************************************
After this i tried some ways to get the File name and path but
with out success.

I am converting the QString to Char * by :-

e.g

QString fileName;
char *s = (fileName.toAscii()).data(); // It works for some other function...

************************************

If i directly provide values to the path char * and file name char * in
the API
function, i have to give the path like

char * path = "D:\\QTProjects\\Sample\\project";

Please help, how to get the file name and path from the QFileDialog.
and path format issue like "D:\\QTProjects\\Sample\\project";
???


Thanks alot...



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Message 5 in thread

rohitj wrote:
> QString fileName;
> char *s = (fileName.toAscii()).data(); // It works for some 

This is a very common (C++) mistake and has been answered on this list
many times.

try this instead:

QString fileName;
QByteArray byteArray = fileName.toAscii();
char *s = byteArray.data();

this way, the bytearray won't go out of scope, and won't be freed before
you access it.

of course you can get away with something like this:
printf((fileName.toAscii()).data());

this is because the temporary QByteArray isn't freed before printf has
been called. it's freed at the end of the block, indicated by the ;

Cheers,
Peter

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Message 6 in thread

Thanks alor Peter........

Now it is working...:-))

Thanks 1000.......



> rohitj wrote:
>> QString fileName;
>> char *s = (fileName.toAscii()).data(); // It works for some
>
> This is a very common (C++) mistake and has been answered on this list
> many times.
>
> try this instead:
>
> QString fileName;
> QByteArray byteArray = fileName.toAscii();
> char *s = byteArray.data();
>
> this way, the bytearray won't go out of scope, and won't be freed before
> you access it.
>
> of course you can get away with something like this:
> printf((fileName.toAscii()).data());
>
> this is because the temporary QByteArray isn't freed before printf has
> been called. it's freed at the end of the block, indicated by the ;
>
> Cheers,
> Peter
>
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