如何在Qt中制作自定义颜色选择器？

#include <QtWidgets>

class ColorWidget : public QWidget {
public:
    ColorWidget(QWidget *parent = nullptr) : QWidget(parent) {
        setFixedSize(100, 100);
    }

    void setColor(const QColor &color) {
        QPalette palette;
        palette.setColor(QPalette::Background, color);
        setPalette(palette);
    }
};

class MainWindow : public QMainWindow {
public:
    MainWindow(QWidget *parent = nullptr) : QMainWindow(parent) {
        QPushButton *colorButton = new QPushButton("选择颜色", this);
        connect(colorButton, &QPushButton::clicked, this, &MainWindow::openColorDialog);

        colorWidget = new ColorWidget(this);
        setCentralWidget(colorWidget);
    }

private slots:
    void openColorDialog() {
        QColorDialog dialog(this);
        QColor color = dialog.getColor();
        if (color.isValid()) {
            colorWidget->setColor(color);
        }
    }

private:
    ColorWidget *colorWidget;
};

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

    MainWindow window;
    window.show();

    return app.exec();
}