Qt窗口遮罩显示等待动画

1.效果

2.代码

#ifndef LOADINGMASK_H
#define LOADINGMASK_H

#include <QWidget>
#include <QLabel>
#include <QMovie>
#include <QPainter>
#include <QApplication>
#include <QScreen>

class LoadingMask : public QWidget
{
    Q_OBJECT
public:
    explicit LoadingMask(QWidget* parent = nullptr) :QWidget(parent){
        init();
    }
    // 显示遮罩
    static void showMask(QWidget* parent) {
        if (!parent) return;

        LoadingMask* mask = new LoadingMask(parent);
        mask->resize(parent->size());
        mask->show();
    }

    // 隐藏遮罩
    static void hideMask(QWidget* parent) {
        if (!parent) return;
        for (QWidget* child : parent->findChildren<LoadingMask*>()) {
            child->deleteLater();
        }
    }
protected:
    void paintEvent(QPaintEvent* event) override {
        Q_UNUSED(event)

        QPainter painter(this);
               painter.fillRect(rect(), QColor(255, 255, 255, 200));
    }

    void resizeEvent(QResizeEvent* event) override {
        Q_UNUSED(event)
        if (lb_loading_) {
            centerLoadingLabel();
        }
    }
private:
    void init(){
        setWindowFlags(Qt::FramelessWindowHint);
        setAttribute(Qt::WA_TranslucentBackground);

        lb_loading_ = new QLabel(this);
        lb_loading_->setObjectName("lb_mv");
        lb_loading_->setFixedSize(300, 250);
        movie_ = new QMovie("D:/wait_loading.gif");
        movie_->setScaledSize(lb_loading_->size());
        lb_loading_->setMovie(movie_);
        movie_->start();

        setStyleSheet(R"(
                      QLabel#lb_mv{
                      background:grey;
                      }
                      )");
    }

    void centerLoadingLabel() {
        if (!lb_loading_) return;
        const QPoint center = rect().center();
        const QSize labelSize = lb_loading_->size();
        lb_loading_->move(
                    center.x() - labelSize.width() / 2,
                    center.y() - labelSize.height() / 2
                    );
    }

private:
    QLabel *lb_loading_ = nullptr;
    QMovie *movie_ = nullptr;
};

#endif // LOADINGMASK_H