实现多主题切换的秘密：通过自定义事件和主题颜色配置

自定义事件注册：

extern int STYLE_CHANGE_EVENT;
class style_change_event : public QEvent {
public:
    enum mystyle { Turquoise, Orange, Pink, Red, Coffee, Blue_Grey, Blue, Green, Lavender, Arctic_Glacier, Custom };
    mystyle get_style() { return now_style; }
    void set_style(mystyle style) { now_style = style; }
    void set_color_list(QStringList list) { color_list = list; }
    QStringList get_color_list() { return color_list; }
private:
    mystyle now_style;
    QStringList color_list;
};
int STYLE_CHANGE_EVENT = QEvent::registerEventType();
style_change_event::style_change_event() : QEvent(QEvent::Type(STYLE_CHANGE_EVENT)) {}
style_change_event::~style_change_event() {}

生成事件并触发：

style_change_event *event = new style_change_event;
event->set_style(style_change_event::Turquoise);
qApp->postEvent(this, event);

事件过滤器处理：

bool MainWindow::eventFilter(QObject *watched, QEvent *event) {
    if(event->type() == STYLE_CHANGE_EVENT) {
        style_change_event *e = dynamic_cast
    
     (event);
        if(e) {
            int type = e->get_style();
            switch(type) {
                case style_change_event::Turquoise:
                    style_main_color = "00beac";
                    style_hover_color = "20c9b3";
                    style_item_hover_color = "cafcef";
                    style_item_select_color = "9aefdb";
                    style_press_color = "01968c";
                    break;
                // ... 其他主题类型的处理代码 ...
            }
        }
    }
    return true;
}