Qt Interface optimization ： Double click the mouse effect

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One 、 Double click special effects

Two 、 Use steps

1. .h part

The code is as follows ：

#include <QMovie>
#include <QLabel>
#include <QMouseEvent>
#include <QLine>

protected:
    void mouseDoubleClickEvent(QMouseEvent *event); // Double click event 

2. .cpp part

The code is as follows ：

// Double click the mouse effect 
void MainWindows::mouseDoubleClickEvent(QMouseEvent *event)
{
    
    // Judge whether it is double clicking with the left mouse button 
    if(event->button() == Qt::LeftButton)
    {
    
        QLabel * label = new QLabel(this);
        QMovie * movie = new QMovie("://images/mouse.gif");// load gif picture 
        // Set up label Automatic adaptation gif Size 
        label->setScaledContents(true);

        label->setMovie(movie);
        // Here to call move convenient , Conduct resize, What we need to know is gif The size of is 150*150
        label->resize(180,180);
        label->setStyleSheet("background-color:rgba(0,0,0,0);");
        // Set mouse penetration 
        label->setAttribute(Qt::WA_TransparentForMouseEvents, true);
        // Give Way label The center of the is at the double click position of the current mouse 
        label->move(event->pos().x()-label->width()/2,event->pos().y()-label->height()/2);
        // Start playing gif
        movie->start();

        label->show();

        // binding QMovie The signal of , Judge gif plays 
        connect(movie, &QMovie::frameChanged, [=](int frameNumber) {
    
            if (frameNumber == movie->frameCount() - 1)//gif The number of plays is 1, Turn off the tag 
                label->close();
        });
    }
}

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Be careful

gif The background of the moving picture must be transparent ！！！

The following is my mouse double click effect picture , You can click the picture , Long press to save and use .