C++ Qt QColorDialog使用方法

#include "widget.h"
#include "ui_widget.h"
#include <QColorDialog>
#include <QPalette>

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

    ui->label->setText(u8"我是lable");
}

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

void Widget::on_btn1_clicked()
{
    QColor color = QColorDialog::getColor(Qt::white, this, u8"选择颜色");
    if(color.isValid())
    {
        QPalette palette;
        palette.setColor(QPalette::Background ,color);
        ui->label->setAutoFillBackground(true);
        ui->label->setPalette(palette);
    }
}

static QColor getColor(const QColor &initial = Qt::white,
                           QWidget *parent = nullptr,
                           const QString &title = QString(),
                           ColorDialogOptions options = ColorDialogOptions());

inline void QPalette::setColor(ColorRole acr, const QColor &acolor)

enum ColorRole { WindowText, Button, Light, Midlight, Dark, Mid,
                     Text, BrightText, ButtonText, Base, Window, Shadow,
                     Highlight, HighlightedText,
                     Link, LinkVisited,
                     AlternateBase,
                     NoRole,
                     ToolTipBase, ToolTipText,
                     PlaceholderText,
                     NColorRoles = PlaceholderText + 1,
#if QT_DEPRECATED_SINCE(5, 13)
                     Foreground Q_DECL_ENUMERATOR_DEPRECATED_X("Use QPalette::WindowText instead") = WindowText,
                     Background Q_DECL_ENUMERATOR_DEPRECATED_X("Use QPalette::Window instead") = Window
#endif
                   };