QPalette propagation to QDialog not working - c++

Question

I have set a dark theme on my QWidget. In that widget I call a QDialog. The dialog appears in default palette which is light.
This is my custom dialog (Which in this case is for choosing colors for palette! Twisted right?) .cpp file:
#include "custompalettedialog.h"
CustomPaletteDialog::CustomPaletteDialog(QPalette palette, QWidget *parent) : QDialog(parent),
m_palette(palette)
{
QVBoxLayout* mainLayout = new QVBoxLayout(this);
mainLayout->setSpacing(0);
mainLayout->setMargin(0);
QFormLayout* mainFormLayout = new QFormLayout;
mainFormLayout->setHorizontalSpacing(0);
mainFormLayout->setVerticalSpacing(0);
mainLayout->addLayout(mainFormLayout);
for (int var = 0; var < QPalette::ColorRole::NColorRoles; ++var) {
QPushButton* bandButton = new QPushButton;
bandButton->setFlat(true);
bandButton->setAutoFillBackground(true);
QPalette pal = bandButton->palette();
pal.setColor(QPalette::Button, m_palette.color(static_cast<QPalette::ColorRole>(var)));
bandButton->setPalette(pal);
connect(bandButton, &QPushButton::clicked, this, [this, bandButton, var]() {
QColor color = QColorDialog::getColor();
if (color.isValid()) {
m_palette.setColor(static_cast<QPalette::ColorRole>(var), color);
QPalette pal = bandButton->palette();
pal.setColor(QPalette::Button, color);
bandButton->setPalette(pal);
}
});
mainFormLayout->addRow(QVariant::fromValue(static_cast<QPalette::ColorRole>(var)).toString(), bandButton);
}
QPushButton* doneButton = new QPushButton("Done");
connect(doneButton, &QPushButton::clicked, this, &QDialog::accept);
mainLayout->addWidget(doneButton);
}
QPalette CustomPaletteDialog::getPalette()
{
return m_palette;
}
QPalette CustomPaletteDialog::getPalette(bool* ok, const QPalette palette, QWidget *parent, const QString title)
{
CustomPaletteDialog* dialog = new CustomPaletteDialog(palette, parent);
dialog->setFont(parent->font());
dialog->setModal(true);
dialog->setWindowTitle(title);
dialog->exec();
QPalette pal = dialog->getPalette();
*ok = dialog->result();
dialog->deleteLater();
return pal;
}
and the .h file:
#ifndef CUSTOMPALETTEDIALOG_H
#define CUSTOMPALETTEDIALOG_H
#include <QDialog>
#include <QFormLayout>
#include <QPushButton>
#include <QLineEdit>
#include <QColorDialog>
#include <QComboBox>
class CustomPaletteDialog : public QDialog
{
Q_OBJECT
public:
explicit CustomPaletteDialog(QPalette palette, QWidget *parent = nullptr);
static QPalette getPalette(bool* ok, const QPalette palette, QWidget *parent = nullptr, const QString title = QString());
QPalette getPalette();
private:
QPalette m_palette;
};
#endif // CUSTOMPALETTEDIALOG_H
I call the static method getPalette from a parent widget.
I have tried adding this:
dialog->setPalette(parent->palette());
before dialog->setFont(parent->font()); in that static method and not working. My question is how to propagate QPalette from parent QWidget to child QDialog?
This is how I used it:
QPushButton* paletteAddButton = new QPushButton("Add...");
mainGroupBoxLayout->addWidget(paletteAddButton);
connect(paletteAddButton, &QPushButton::clicked, this, [this, customThemeItemModel]() {
bool ok = false;
QPalette palette = CustomPaletteDialog::getPalette(&ok, this->palette(), this, "Chosse UI Palette");
if (ok) {
QStandardItem* item = new QStandardItem("newPalette");
item->setToolTip("Double Click to Change Name, Right Click for More");
item->setData(palette);
customThemeItemModel->appendRow(item);
saveThemes(customThemeItemModel);
}
});
I have a list of themes, user can add custom themes to that list.