How to add transparency image in QT5.5.1 ?

Revathi

Hi,

Now I am trying to add transparency image in qt.5.5.1. It is not working .But it is works well in qt 4.8.7.

My sample code is below,

   QLabel* bg = new QLabel(&w);
bg->setGeometry(100, 100, 200, 200);
bg->show();
bg->setText("Hello");
bg->setStyleSheet("background-color: yellow;");
    QPushButton* trans = new QPushButton(&w);
trans->setGeometry(100, 100, 200, 200);
QPixmap pixmap("transparent.png");
QIcon ButtonIcon(pixmap);
trans->setIcon(ButtonIcon);
trans->setIconSize(trans->size());
trans->setStyleSheet("background-color: rgba(255, 255, 255, 0);");

This is works good in my pc. Am I need to change any code for qt 5.5.1? I am using X86 processor machine to run this code.

mrjj

Hi
Are you sure it find the
QPixmap pixmap("transparent.png"); ?

Revathi

@mrjj Yes it found the image correctly. That's why it is working correctly in qt 4.8.7 version if I change the Kit configuration.

mrjj

Ok so how does it "not work" ?
if i use your code ( with less trans ) i see
alt text

Ratzz

@Revathi said in How to add transparency image in QT5.5.1 ?:

if I change the Kit configuration.

Do you get any error after changing kit and running the same code with 5.5.1?

Revathi

@Ratzz no. I did not get any error while changing kit.

mrjj

@Revathi
but what do you see ?
"It is not working" is a very poor description of your actual issue.

Revathi

@mrjj

I am getting like this only.

mrjj

@Revathi
Ok
Its working here with Qt5.12
Can you try
trans->setGeometry(100, 100, 180, 180);
( make buttons slightly less than yellow label)

Revathi

@mrjj

If I have changed geometry , the output will be like the above picture (in qt 5.5.1)

mrjj

@Revathi
Ok. just a test.
Maybe its something in 5.5.1. Can you try a newer version ?

Revathi

@mrjj the transparency is working now in qt 5.5.1. The code is given below,

QLabel* bg = new QLabel(&w);
bg->setGeometry(100, 100, 200, 200);
bg->show();
bg->setText("Hello");
bg->setStyleSheet("background-color: yellow;");

QPushButton* trans = new QPushButton(&w);
trans->setGeometry(100, 100, 200, 200);
QPixmap pixmap("transparent.png");
QIcon ButtonIcon(pixmap);
trans->setIcon(ButtonIcon);
trans->setIconSize(trans->size());
trans->setStyleSheet("border: None");        // It will make the image button as transparent
trans->show();

If I have changed background color of QLabel, it will transparent to the image button window.

I hope it may help. Thank you all.