Change color highlight of icons in QTableView, when the cell is selected

Question

When a cell is selected in QTableView, the icons in it are given a blue highlight, how can I control the color of this highlight or disable it?

I tried setting the QPalette::Highlight but it didn't work.

Edit:

Okay, so I do know how to change the background color and text color and color highlight, but not for an icon. If I return an icon as decoration for a cell, it is given a light blue highlight when the cell is selected. How do I remove this?

Answer 1

It's utterly impossible to change this behavior with the standard style in Qt. You need to implement your own specific style in order to work around this.

Answer 2

You can use style sheets to define the color of your elements. The name of the selected item in your QTableView is selection-background-color. So, changing the color of this element you will chose the background color that your prefer.

#include <QtWidgets/QApplication>
#include <QtWidgets/QTableView>
#include <QStandardItemModel>

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

    QTableView *table = new QTableView();
    QStandardItemModel *model = new QStandardItemModel(2,2);

    table->setModel(model);
    table->setStyleSheet("selection-background-color: red");

    table->show();

    return app.exec();
}

Look how it looks in the picture:

Answer 3

I discovered a way around this issue, but it has some cost associated with it.

Fundamentally, deep within Qt code it is calling onto QIcon::paint() and passing QIcon::Selected as the icon mode, so the issue is that the "selected" form of the icon's pixmap at the desired resolution is the one auto-generated by Qt.

I worked around this by setting the Selected form of the icon to be the same as the Normal mode:

  // Make the "Selected" version of the icon look the same as "Normal".
  for (const auto& size : icon.availableSizes())
  {
    icon.addPixmap(icon.pixmap(size, QIcon::Normal, QIcon::Off),
                   QIcon::Selected, QIcon::Off);
    icon.addPixmap(icon.pixmap(size, QIcon::Normal, QIcon::On),
                   QIcon::Selected, QIcon::On);
  }

The downside is extra time spent doing this, possibly extra memory to store it, and wasted time generating the selected icons that we're throwing away.

In my case I'm using a QStyledItemDelegate and unfortunately that doesn't give you the ability to more closely influencing how the icon is rendered without completely reimplementing how QStyle::CE_ItemViewItem is rendered in your style.

Come to think of it, if you use a proxy style it wouldn't be too hard to override how CE_ItemViewItem is rendered to not use a selected icon, so that would be an option too.