1、官方自带

Qt官方自带的QColorDialog类提供了一个指定颜色的对话框部件。

#include <QColorDialog>

QColor i = QColorDialog::getColor(Qt::red, this,

                                         tr("颜色对话框"),

                                         QColorDialog::ShowAlphaChannel);

2、自定义

但是好多开源项目都使用了自定义控件Qt Color Widgets。

https://gitlab.com/mattia.basaglia/Qt-Color-Widgets

C++使用方法：

1.pro文件

LIBS += -L$${DESTDIR} #lib path

LIBS += "QtColorWidgets-Qt52.lib"

INCLUDEPATH += ../color_widgets/include/

INCLUDEPATH += ../color_widgets/include/QtColorWidgets/

2.cpp源文件

#include "color_dialog.hpp"
void Designer::on_actionColor_triggered()
{
    color_widgets::ColorDialog dlg;
    connect(&dlg, &color_widgets::ColorDialog::colorSelected, this, &Designer::color_changed);
    dlg.exec();
}
void Designer::color_changed(QColor color)
{
    int r, g, b, a;
    color.getRgb(&r, &g, &b, &a);
    color.getHsv(&r, &g, &b, &a);
}

https://github.com/pencil2d/pencil

https://github.com/douzhongqiang/EasyCanvas

https://github.com/caryoscelus/rainynite-studio

https://github.com/caryoscelus/Qt-Color-Widgets

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https://github.com/frankosterfeld/qtkeychain

独立于平台的Qt API，用于安全存储密码。