QWidget::setLayout error : Attempting to set QLayout [...], which already has a layout

Question

On execution (no compile error) I get on the console

QWidget::setLayout: Attempting to set QLayout "" on CGSearchResult "", which already has a layout

I am using the following code:

CGSearchResult::CGSearchResult(QWidget *parent) : QWidget(parent)
{
    initControls();
    SetTableContent();
}

void CGSearchResult::initControls()
{
   backButton = new QPushButton(tr("&Back"));
   connect(backButton, SIGNAL(clicked()), this, SLOT(showHome()));

   model=new QStandardItemModel();

   QWidget::setFont(QFont("Courier New", 8, QFont::Bold));

   searchTable = new QTableView(this);
   searchTable->showGrid();

   searchTable->resize(720,400);
   searchTable->horizontalHeader()->setDefaultSectionSize(170);
   searchTable->verticalHeader()->setDefaultSectionSize(50);
   searchTable->verticalHeader()->hide();
   searchTable->horizontalHeader()->setResizeMode(QHeaderView::Fixed);
   searchTable->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    
   QGridLayout *layout = new QGridLayout();
   layout->addWidget(backButton, 0, 0, 1, 1);
   layout->addWidget(searchTable, 2, 0, 1, 1);

   setLayout(layout);
}

Post unmodified source - the snippet you present is obviously incomplete (for example there is no SetTableContent implementation, the model is not set on searchTable). Only then someone will be able to help you. — chalup
– chalup, Commented Oct 3, 2010 at 15:47
Actully Chalup, I have implemented the setModel method on the SetTableContent method..one more thing this widget is calling from the another class.(QMainWindow). — Finder
– Finder, Commented Oct 3, 2010 at 16:03

Linville · Accepted Answer · 2014-05-13 13:24:31Z

6

http://qt-project.org/doc/qt-4.8/qwidget.html#setLayout

If there already is a layout manager installed on this widget, QWidget won't let you install another. You must first delete the existing layout manager (returned by layout()) before you can call setLayout() with the new layout.

edited May 13, 2014 at 13:24

Linville

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answered Oct 3, 2010 at 15:42

Ronny Brendel

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3 Comments

Finder Over a year ago

How to find the layout manger already installed or not? Could you please tell me?

Finder Over a year ago

Thanks Ronny... I got it.. I used qDeleteAll(myQWidget->children());

Ronny Brendel Over a year ago

I think testing whether layout() != 0 suffices

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