Hide contents of different layouts

[zarkzervo]

I have created several QGridLayout and put different labels and other widgets in these. As I choose an option in a QComboBox, I will hide all layouts but the one I have chosen, i.e. show different set of widgets for different options.

I have tried this:

test_layout = new QGridLayout();
test_layout->setColumnStretch(0,1);
test_labelOne = new QLabel("Angle");
test_labelOne->setParent(test_layout);
test_layout->addWidget(test_labelOne, 0, 1);

test_layout = new QGridLayout();
test_layout->setColumnStretch(0,1);
test_labelOne = new QLabel("Angle");
test_labelOne->setParent(test_layout);
test_layout->addWidget(test_labelOne, 0, 1);

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For then later traverse the test_layout->children() to set visibility on these children.

This gives me the compile-error:
ConfigureDlg.cpp:520: error: no matching function for call to âQLabel::setParent(QGridLayout*&)â
/usr/local/Trolltech/Qt-4.5.0-rc1/include/QtGui/qwidget.h:527: note: candidates are: void QWidget::setParent(QWidget*)
/usr/local/Trolltech/Qt-4.5.0-rc1/include/QtGui/qwidget.h:528: note: void QWidget::setParent(QWidget*, Qt::WindowFlags)

Any suggestions?

setParent(QObject*) is a function in QObject. and setParent(QWidget*) is a function in QWidget, but QWidget inherits QObject. Shouldn't it be available?

What I really try to accomplish is to have several set of layouts and hide and show these on demand to get a more clean code.

[Lykurg]

Hi,

couldn't you just delete row 4 with the set setParent? And how is test_layout defined? Maybe you have forgotten the "*":

QLabel::setParent(QGridLayout*&)

QLabel::setParent(QGridLayout*&)

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isn't right because it only will accept

QLabel::setParent(QGridLayout*)

QLabel::setParent(QGridLayout*)

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Lykurg

[zarkzervo]

Found a solution:

void ConfigureDlg::showChildren(const QGridLayout* layout, bool show)
{
  QLayoutItem *item = 0;
  QWidget *widget = 0;
 
  for(int i = 0; i < layout->rowCount(); ++i)
  {
    for(int j = 0; j < layout->columnCount(); ++j)
    {
      item = layout->itemAtPosition(i,j);
      widget=item?item->widget():0;
      if(widget)
        widget->setVisible(show);
    }
  }
}

void ConfigureDlg::showChildren(const QGridLayout* layout, bool show)
{
  QLayoutItem *item = 0;
  QWidget *widget = 0;

  for(int i = 0; i < layout->rowCount(); ++i)
  {
    for(int j = 0; j < layout->columnCount(); ++j)
    {
      item = layout->itemAtPosition(i,j);
      widget=item?item->widget():0;
      if(widget)
        widget->setVisible(show);
    }
  }
}

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item->widget() is a type safe casting function that returns 0 if the item is not a QWidget.

Each subset of tools are added to their own QGridLayout and all these layouts are added to a layout in my dialog widget with the same position.

[Lykurg]

Wow, better you apply the layout to a QWidget/QFrame etc. and hide/show this.

[zarkzervo]

Wow, better you apply the layout to a QWidget/QFrame etc. and hide/show this.

Ah. That was probably what I was looking for in the first place. But then I got another layer and some margins that need to be set, so I'll probably stick with my method now that I've already coded it.