9

I use QCheckBox in QTableWidgetCell

QWidget *widget = new QWidget();
QCheckBox *checkBox = new QCheckBox();
QHBoxLayout *layout = new QHBoxLayout(widget);
layout->addWidget(checkBox);
layout->setAlignment(Qt::AlignCenter);
layout->setContentsMargins(0, 0, 0, 0);
widget->setLayout(layout);
table->setCellWidget(0, 0, widget);

How can I change cell background?

Ufx
  • 2,595
  • 12
  • 44
  • 83

3 Answers3

9

The code:

widget->setStyleSheet("background-color: red");

works fine but you need to set the style for every container widget you add to your table:

So in order to see the change you need the following code:

QWidget *widget = new QWidget();
widget->setStyleSheet("background-color: red");
QCheckBox *checkBox = new QCheckBox();
QHBoxLayout *layout = new QHBoxLayout(widget);
layout->addWidget(checkBox);
layout->setAlignment(Qt::AlignCenter);
layout->setContentsMargins(0, 0, 0, 0);
widget->setLayout(layout);

QWidget *widget2 = new QWidget();
widget2->setStyleSheet("background-color: red");
QCheckBox *checkBox2 = new QCheckBox();
QHBoxLayout *layout2 = new QHBoxLayout(widget2);
layout2->addWidget(checkBox2);
layout2->setAlignment(Qt::AlignCenter);
layout2->setContentsMargins(0, 0, 0, 0);
widget2->setLayout(layout);

ui->tableWidget->setCellWidget(0, 0, widget);
ui->tableWidget->setCellWidget(0, 1, widget2);

And the result will be:

enter image description here

Jacob Krieg
  • 2,834
  • 15
  • 68
  • 140
  • It works. But only last background changed cell has set background. Previous cells backgrounds recovered. – Ufx Oct 10 '14 at 03:13
1

You should try this:

checkBox->setStyleSheet("background-color: red;");

If you want to specify it more generally, write the classtype in the CSS to indicate which class in the hierarchy should handle the flag. This could look something like this then:

QWidget { background-color: red; }
msrd0
  • 7,816
  • 9
  • 47
  • 82
1

If you want to change cell background, not a widget, use setBackground() method:

QCheckBox *checkBox = new QCheckBox("example");
QWidget *widget = new QWidget();
QHBoxLayout *layout = new QHBoxLayout(widget);
layout->addWidget(checkBox);
layout->setAlignment(Qt::AlignCenter);
layout->setContentsMargins(0, 0, 0, 0);
widget->setLayout(layout);
ui->tableWidget_2->setCellWidget(0,0,widget);
ui->tableWidget_2->item(0, 0)->setBackground(Qt::red);//this line should be

In this case all your cell will be red (without white lines around checkbox).

Jablonski
  • 18,083
  • 2
  • 46
  • 47
  • ui->tableWidget_2->item(0, 0)->setBackground(Qt::red); is dangerous because .setCellWidget doesn't create an item on that cell which return null pointer – Phiber Feb 05 '18 at 18:44
  • The last line causes a crash because `item(0,0)` returns a null pointer. – PlinyTheElder Nov 07 '19 at 16:09