原理很简单，就是用WebView打开Live2D的页面，固定page所在的位置以及大小，然后将WebView的页面设置为透明，再固定到屏幕右下角即可。

桌面萌宠.gif

Desktopcute.h

#pragma once

#include <QtWidgets/QWidget>
#include "ui_Desktopcute.h"

class QWebEngineView;
class Desktopcute : public QWidget
{
    Q_OBJECT

public:
    Desktopcute(QWidget *parent = Q_NULLPTR);
    Desktopcute(QString HtmlPath);

private:
    Ui::DesktopcuteClass ui;
public:
    QWebEngineView* WebView;
};

Desktopcute.cpp

#include "Desktopcute.h"
#include <QWebEngineView>

Desktopcute::Desktopcute(QWidget *parent)
    : QWidget(parent)
{
    ui.setupUi(this);

    
}

Desktopcute::Desktopcute(QString HtmlPath)
{
    WebView = new QWebEngineView(this);
    WebView->resize(800, 300);
    WebView->page()->setBackgroundColor(Qt::transparent);
    WebView->setAttribute(Qt::WA_TranslucentBackground);
    WebView->setStyleSheet("background:transparent");
    WebView->page()->setBackgroundColor(Qt::transparent);
    WebView->page()->load(QUrl(HtmlPath));
    WebView->show();
}

main.cpp

#include "Desktopcute.h"
#include <QtWidgets/QApplication>
#include "QScreen"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Desktopcute w(a.applicationDirPath() + "/Live2D/demo.html");
    QScreen *screen = QGuiApplication::primaryScreen();
    QRect mm = screen->availableGeometry();
    w.setGeometry(mm.width() - 300, mm.height() - 300, 300, 300);
    w.setAttribute(Qt::WA_TranslucentBackground);
    w.setWindowFlags(Qt::Tool | Qt::WindowStaysOnTopHint | Qt::FramelessWindowHint);
    w.show();
    return a.exec();
}