How to make animation in *.gif run only once in Qt? [duplicate] - qt

Question

I'm using QMovie and gif to create explosion after collision. The problem is that my gif is looping over and over, I've checked loopcount status and it returns -1 (infinite). How to display my gif just one time?
#include "Bullet.h"
#include <QTimer>
#include <QGraphicsScene>
#include <QList>
#include "Enemy.h"
#include "Game.h"
#include <typeinfo>
#include "levels.h"
extern Game * game; // there is an external global object called game
int Bullet::killed = 0;
int Bullet::missed = 0;
double Bullet::accurancy = 0;
Bullet::Bullet(QGraphicsItem *parent): QGraphicsPixmapItem(parent){
// draw graphics
setPixmap(QPixmap(":/images/res/images/bullets/bullet.png"));
missed++; // increse missed when bullet is created
movie = new QMovie(":/images/res/images/effects/explosion/64x48.gif");
processLabel = new QLabel;
processLabel->setMovie(movie);
// make/connect a timer to move() the bullet every so often
QTimer * timer = new QTimer(this);
connect(timer,SIGNAL(timeout()),this,SLOT(move()));
// start the timer
timer->start(2);
}
void Bullet::move(){
// get a list of all the items currently colliding with this bullet
QList<QGraphicsItem *> colliding_items = collidingItems();
// if one of the colliding items is an Enemy, destroy both the bullet and the enemy
for (int i = 0, n = colliding_items.size(); i < n; ++i){
if (typeid(*(colliding_items[i])) == typeid(Enemy)){
// increase the score
game->score->increase();
//play explosion animation
movie->start();
movie->setSpeed(180);
processLabel->setAttribute(Qt::WA_NoSystemBackground);
processLabel->setGeometry(QRect(x()-15,y()-15,64,48));
scene()->addWidget(processLabel);
qDebug() << movie->loopCount();
//connect(movie,SIGNAL(finished()),movie,SLOT(stop()));
// remove them from the scene (still on the heap)
scene()->removeItem(colliding_items[i]);
scene()->removeItem(this);
// delete them from the heap to save memory
delete colliding_items[i];
delete this;
killed++;
missed--; // decrese missed if bullet colide with enemy
if((killed+1) % 9 == 0)
{
game->level->Levels::incrementLevels();
game->score->Score::addToSum(); /// TODO
}
//qDebug() << "Already killed: " << killed;
//qDebug() << "Already missed: " << missed;
// return (all code below refers to a non existint bullet)
return;
}
}
// if there was no collision with an Enemy, move the bullet forward
setPos(x(),y()-1);
// if the bullet is off the screen, destroy it
if (pos().y() < 0){
scene()->removeItem(this);
delete this;
}
}

Answer 1

I had the same question and didn't find anything, so here's my solution:
connect the signal "frameChanged(int)" to:
void Bullet::frameChanged_Handler(int frameNumber) {
if(frameNumber == (movie->frameCount()-1)) {
movie->stop();
}
}
If you want to run X times the loop you just have to add a static counter to know how many times you've passed the last frame:
void Bullet::frameChanged_Handler(int frameNumber) {
static int loopCount = 0;
if(frameNumber == (movie->frameCount()-1)) {
loopCount++;
if(loopCount >= MAX_LOOP_TIMES)
movie->stop();
}
}
and of course, connect with this:
connect(movie, SIGNAL(frameChanged(int)), this, SLOT(frameChanged_Handler(int)));
That's it... Hope it can help you.