ThemeManager.cpp

#include <QStyle>
#include <QApplication>
#include <QStyleFactory>

#include "ThemeManager.hpp"

ThemeManager *themeManager = new ThemeManager;

extern QString ReadFileText(const QString &path);

void ThemeManager::ApplyTheme(const QString &theme) {
    auto internal = [=] {
        if (this->system_style_name.isEmpty()) {
            this->system_style_name = qApp->style()->objectName();
        }
        if (this->current_theme == theme) {
            return;
        }

        bool ok;
        auto themeId = theme.toInt(&ok);

        if (ok) {
            // System & Built-in
            QString qss;

            if (themeId != 0) {
                QString path;
                std::map<QString, QString> replace;
                switch (themeId) {
                    case 1:
                        path = ":/themes/feiyangqingyun/qss/flatgray.css";
                        replace[":/qss/"] = ":/themes/feiyangqingyun/qss/";
                        break;
                    case 2:
                        path = ":/themes/feiyangqingyun/qss/lightblue.css";
                        replace[":/qss/"] = ":/themes/feiyangqingyun/qss/";
                        break;
                    case 3:
                        path = ":/themes/feiyangqingyun/qss/blacksoft.css";
                        replace[":/qss/"] = ":/themes/feiyangqingyun/qss/";
                        break;
                    default:
                        return;
                }
                qss = ReadFileText(path);
                for (auto const &[a, b]: replace) {
                    qss = qss.replace(a, b);
                }
            }

            auto system_style = QStyleFactory::create(this->system_style_name);

            if (themeId == 0) {
                // system theme
                qApp->setPalette(system_style->standardPalette());
                qApp->setStyle(system_style);
                qApp->setStyleSheet("");
            } else {
                if (themeId == 1 || themeId == 2 || themeId == 3) {
                    // feiyangqingyun theme
                    QString paletteColor = qss.mid(20, 7);
                    qApp->setPalette(QPalette(paletteColor));
                } else {
                    // other theme
                    qApp->setPalette(system_style->standardPalette());
                }
                qApp->setStyleSheet(qss);
            }
        } else {
            // QStyleFactory
            const auto &_style = QStyleFactory::create(theme);
            if (_style != nullptr) {
                qApp->setPalette(_style->standardPalette());
                qApp->setStyle(_style);
                qApp->setStyleSheet("");
            }
        }

        current_theme = theme;
    };
    internal();

    auto nekoray_css = ReadFileText(":/neko/neko.css");
    qApp->setStyleSheet(qApp->styleSheet().append("\n").append(nekoray_css));
}