[Qt-interest] Show QTableView is a very slow?

[SALOMEHER at terra.es]

I have a class

class MiTabla: public QTableView
 
MiTabla(QWidget *parent):QTableView(parent)  { ... }
void mousePressEvent(QMouseEvent *event) { ... }
void keyPressEvent(QKeyEvent *event) { ... }

I then in my code initializes

MiTabla *view = new MiTabla(principal);
view->setGeometry(1, 0, principal->width()-1, PanLeyenda->y()-2));
TablaModelI *model = new TablaModelI(0, MatrizMicroDatosS, listaH, 
listaV);
view->setModel(model);

MatrizMicroDatosS is QString **
listaH and listaV is QStringList
TablaModelI is class TablaModelI: public QAbstractTableModel 

TablaModelI::TablaModelI(QObject *parent, QString ** &vec, QStringList 
&cabecH, QStringList &cabecV):QAbstractTableModel(parent)
  {
    distances = vec;
    cabeceraH = cabecH;
    cabeceraV = cabecV;    
  }

where I in
QVariant data(const QModelIndex &index, int role) { ... }
I paint each cell of a different color depending on the value you 
have. 

QVariant TablaModelI::data(const QModelIndex &index, int role) const
  {
    if (!index.isValid())
      return QVariant();

    if (role == Qt::TextAlignmentRole)
      return int(Qt::AlignCenter);

    if (role == Qt::DisplayRole)
      return distances[index.row()][index.column()];

    if (role == Qt::BackgroundRole) {
      QColor color;
      if (index.column() == 0)
        return QColor(Qt::green);

      if (ConjuntoRegistrosExcluidos.contains(index.row())) {     
        color = Qt::red;
        color.setRgb(255, 144, 16);
        color.setHsv (32, 239, 255);   
        return QColor(color);
      }

      if (VectorExclusionVariables[index.column()-1]) {     
        color = Qt::red;
        color.setRgb(255, 144, 16);
        color.setHsv (32, 239, 255);   
        return QColor(color);
      }

      if (ConjuntoRegistrosIncorrectos.contains(index.row())) {
        if ((VariablesAImputar[index.row()].contains(index.column()
-1))  && (!FmeVariablesAsociadas->EsVariableImputable(index.column()
-1)))
          return QColor(Qt::magenta); 
        return QColor(Qt::red);      
      }

      if (MatrizImputacion[index.row()][index.column()-1])  return 
QColor(Qt::yellow); 
   
      if (ConjuntoRegistrosDonantes.contains(index.row())) {
        color = Qt::cyan;
        color.setRgb(87, 205, 255);
        color.setHsv (198, 168, 255);      
        return QColor(color);
      }else   return QColor(Qt::white);    
    }

    return QVariant();
  }


Could this be the reason why so late?


----Mensaje original----
De: aberaud at infflux.com
Recibido: 03/02/2009 15:32
Para: <qt-interest at trolltech.com>
Asunto: Re: [Qt-interest] Show QTableView is a very slow?

Hi,

We can't give you any answer without some more information. Did you 
derive the QTableView class ? Do you have big calculations in its 
showEvent() ? Do you use a QItemDelegate with a heavy paintEvent() ? 
Did 
you connect the
tab change to one or several slots ?

Regards,

Alex


SALOMEHER at terra.es a écrit :
> Hi,
> I have an application that displays a number of Tab of a 
QTabWidget. 
> Each Tab has a QTableView whose model is a huge matrix. When I go on 
a 
> Tab to display this takes a lot, why is this so? may be because the 
> view has many colors?
>
> Regards.
>
>
> *Ahora también puedes acceder a tu correo Terra desde el móvil.*
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-- 
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