Change icon when QToolButton is pressed

[Saviz]

I am currently setting the icon of my QToolButton (named toolButton) by using the QIcon::fromTheme approach seen below:

#include "mainwindow.h"
#include "./ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    QIcon::setThemeName("feather-light");
    ui->toolButton->setIcon(QIcon::fromTheme("camera-icon"));
}

MainWindow::~MainWindow()
{
    delete ui;
}

This works fine. However, now I need something extra. My question is how can I set custom icons for when my button is pressed, disabled, and other states? For example, let's say I want my icon to change from camera-icon to audio-icon. How can I achieve this?

[SimonSchroeder]

@Saviz Unfortunately, once you change the theme you also need to change the individually added pixmaps one by one again. addPixmap tells the icon to use exactly this pixmap – no matter what.

Our software has a function updateToolbars() which is called when dark mode is changed (or the widget is moved to a monitor with a different resolution). This will just rebuild all icons in the toolbar. I don't think there is a shortcut.

[Christian Ehrlicher]

QIcon can contain difffent images for different states: QIcon::addPixmap()

[Saviz]

This is what I managed to figure out until now:

#include "mainwindow.h"
#include "./ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    QIcon::setThemeName("feather-dark");
    QIcon icon;

    icon.addPixmap(

                QIcon::fromTheme("align-justify").pixmap(ui->toolButton->iconSize()),
                QIcon::Active,
                QIcon::On
                );

    ui->toolButton->setIcon(icon);
    QIcon::setThemeName("feather-light"); // This line won't change my icon style.

}

MainWindow::~MainWindow()
{
    delete ui;
}

It certainly works, but there is still one issue. Since I am using a QPixmap with this method I am unable to set the icon theme after that. If I attempt to change the icon theme like above it won't effect my icon style.

[SimonSchroeder]

@Saviz Unfortunately, once you change the theme you also need to change the individually added pixmaps one by one again. addPixmap tells the icon to use exactly this pixmap – no matter what.

Our software has a function updateToolbars() which is called when dark mode is changed (or the widget is moved to a monitor with a different resolution). This will just rebuild all icons in the toolbar. I don't think there is a shortcut.

[Saviz]

@SimonSchroeder Thank you so much. This was the most honest answer I ever seen in this forum up until now. I appreciate it.