How to start an animation gif inside QPushButton when it is clicked on?

[Xsara]

Re: How to apply gif to Qpushbutton

I am a beginner and I am trying to put a QMovie inside a QPushButton, and it works great, but I want that this gif only appears when I clicked the button, how can I do this?

This is my code:

void CreatorDialog::onBusy()
{
    connect(movie_gif, &QMovie::frameChanged, [=]{
    button_create->setDefault(true);
    button_create->setIcon(movie_gif->currentPixmap());
});
        movie_gif->start();
}

CreatorDialog::CreatorDialog() {
	m_contentVBox = new QVBoxLayout ();
	setLayout(m_contentVBox);
	
		m_contentVBox->addStretch ();
		m_buttonHBox = new QHBoxLayout ();
		m_contentVBox->addLayout(m_buttonHBox);

//Sara urgente parei aqui
        auto movie_gif = new QMovie(this);
        movie_gif->setFileName(":/images/loading.gif");

           m_buttonHBox->addStretch();
            button_create = new QPushButton ("Cancel");

            connect(button_create, SIGNAL(clicked(bool)), this, SLOT(onCancelButtonClicked()));
            m_buttonHBox->addWidget (button_create);
            button_create = new QPushButton ("Create");

//            connect(movie_gif, &QMovie::frameChanged, [=]{
//            button_create->setDefault(true);//Sara urgente
//            button_create->setIcon(movie_gif->currentPixmap());
//        });
//        movie_gif->start();

            connect(button_create, SIGNAL(clicked(bool)), this, SLOT(onBusy()));
            connect(button_create, SIGNAL(clicked(bool)), this, SLOT(onCreateButtonClicked()));
            m_buttonHBox->addWidget (button_create);
}

[JonB]

@Xsara
You seem to almost have it right. Do the connect(movie_gif, &QMovie::frameChanged once outside of the slot, where you currently have it commented out, and do the movie_gif->start(); but not the connect() inside the slot.

You presently have 3 connect(button_create, , SIGNAL(clicked(bool)) going on, that needs tidying.

And if you are a beginner it's worth changing to https://wiki.qt.io/New_Signal_Slot_Syntax for your signals & slots.

[Xsara]

If I uncomment the

connect(movie_gif, &QMovie::frameChanged, [=]{
button_create->setDefault(true);//Sara urgente
button_create->setIcon(movie_gif->currentPixmap());
});

and let the slot onBusy with the:

movie_gif->start();

It doesn't start :-(

[JonB]

@Xsara
I was talking about your approach being close, maybe not your implementation.

I can see things like there is

auto movie_gif = new QMovie(this);

so that's a local variable in the constructor, what is the movie_gif in the slot? If that's a member variable it has nothing to do with the one you created with the new. You need to understand this if that is the case.

[Xsara]

my header contains:

public:
	CreatorDialog();
    QMovie *movie_gif;

but I don't know how to make movie_gif auto, and without the

auto movie_gif = new QMovie(this);

it doesn't works

[JonB]

@Xsara
You need

movie_gif = new QMovie(this);

to set the member variable. And it would be worth your while to spend some time reading some C++ basics, for your own productivity.

[Xsara]

I've been searching a solution for many days, readed about everything and I didn't found how can I place the QMovie *movie_gif = new QMovie(this); in the header or how to start the video with onBusy() and not inside the CreatorDialog()

[Bonnie]

@Xsara I think what @JonB means is, you need to delete that auto in your cpp file.

[Xsara]

@Bonnie you are right, that was the problem, now I see that I didn't see the gif working because I have another slot for the same button and this conflicts with the gif and the movie appears after running the onCreateButtonClicked() and I don't know how to click the button, the loading image appears while the onCreateButtonClicked() is called.
So I will correct the code here:

on header:

private:
    QMovie *movie_gif; 

protected slots:
	virtual void onCreateButtonClicked () = 0;
    virtual void onBusy ();

on cpp:

#include "CreatorDialog.h"
#include <QBoxLayout>
#include <QPushButton>
#include <QMovie>

void CreatorDialog::onBusy()
{
        movie_gif->start();
}

CreatorDialog::CreatorDialog() {
	m_contentVBox = new QVBoxLayout ();
	setLayout(m_contentVBox);
	
		m_contentVBox->addStretch ();
				
		m_buttonHBox = new QHBoxLayout ();
		m_contentVBox->addLayout(m_buttonHBox);

        movie_gif = new QMovie(this);
        movie_gif->setFileName(":/images/loading.gif");

        	m_buttonHBox->addStretch();
            QPushButton *button = new QPushButton ("Cancel");

            connect(button, SIGNAL(clicked(bool)), this, SLOT(onCancelButtonClicked()));
            m_buttonHBox->addWidget (button);

            button = new QPushButton ("Create");

            connect(movie_gif, &QMovie::frameChanged, [=]{
            button->setDefault(true);//Sara urgente
            button->setIcon(movie_gif->currentPixmap());
        });

            connect(button, SIGNAL(clicked(bool)), this, SLOT(onBusy()));
            connect(button, SIGNAL(clicked(bool)), this, SLOT(onCreateButtonClicked()));
            m_buttonHBox->addWidget (button);
}