c++ - How to attach a signal to qPixmap? -

i'm creating application using c++ qt , want load multiple images. attach signal each image can enable or disable them afterwards.

any help?

edit 1:

imagedlg = new qfiledialog(); imagelist =  imagedlg->getopenfilenames(this,                          tr("open document"),                          qdir::currentpath(),                          tr("image files (*.png *.jpg);;all files (*.*)"));   qstring imagename; int x = -50; int y = -50; int n = 1; double size = imagelist.size();  if(imagelist.isempty())     return;  scene->clear(); setcursor(qt::waitcursor);   foreach(imagename,imagelist) {     double val = (n/size)*100;     ui->progressbar->setvalue((int)val);       image.load(imagename,"4",qt::autocolor);      image = image.scaled(100,100,qt::keepaspectratio,qt::fasttransformation);     imagenames.push_back(imagename.tostdstring());     // scene->setscenerect(x,y,100,100);     item = scene->addpixmap(image);     item->setpos(x,y);     x = x + 110;      if(n%4 == 0)     {         x = -50;         y = y + 90;     }      n++; }  //ui->label_2->settext(strcat("10","image(s) loaded successfully")); setcursor(qt::arrowcursor); ui->imagegraphicsview->setscene(scene); 

you should storing qgraphicspixmapitem* pointers you're getting from:

scene->addpixmap(); 

(use e.g. qlist<qgraphicspixmapitem*> or container of choice.)

these objects displayed on scene. can change appearance, show or hide them, change opacity etc. through pointers.

look @ documentation qgraphicsitem detailed information how can manipulate these items.

qgraphicsitem doesn't inherit qobject, doesn't have signals or slots (the classes derived don't either). if want handle mouse events, you'll need create custom graphics item (derived qgraphicspixmapitem example) , re-implement event handling functions you're interested in.

look @ elastic nodes example sample of how can handle mouse events graphics items.