Problem with Parent QWidget and Buttons not working

[VireX]

Yeah see, what I do is I have a QSS file outside the program, and i read that at beginning of the program, its more OO than having to do setStytleSheet each time.

I wish there was an easier way like setStyleName, so that I can just write that in the CSS :P. I guess subclassing isn't too big a problem though :P. Thanks.

jpn, I know about setobject.

PErhaps I could use setProperty. Also when I subclasses QPushButton, I could not define the QSS for it in my file. I tried:
.MyButton {
QPushButton[class="MyButton"] {
QPushButton.MyButton {
MyButton {

It seems sub classing cannot work.

[wysota]

This works fine (maybe you forgot about Q_OBJECT?)

#include <QApplication>
#include <QPushButton>
#include <QLayout>
 
class MyPushButton : public QPushButton {
Q_OBJECT
public:
  MyPushButton(QWidget *parent=0) : QPushButton(parent){}
};
 
#include "main.moc"
 
int main(int argc, char **argv){
  QApplication app(argc, argv);
  QWidget w;
  QVBoxLayout *l = new QVBoxLayout(&w);
  l->addWidget(new MyPushButton);
  l->addWidget(new QPushButton);
  app.setStyleSheet(".MyPushButton{ border: 2px solid black; }");
  w.show();
  return app.exec();
}

#include <QApplication>
#include <QPushButton>
#include <QLayout>

class MyPushButton : public QPushButton {
Q_OBJECT
public:
  MyPushButton(QWidget *parent=0) : QPushButton(parent){}
};

#include "main.moc"

int main(int argc, char **argv){
  QApplication app(argc, argv);
  QWidget w;
  QVBoxLayout *l = new QVBoxLayout(&w);
  l->addWidget(new MyPushButton);
  l->addWidget(new QPushButton);
  app.setStyleSheet(".MyPushButton{ border: 2px solid black; }");
  w.show();
  return app.exec();
}

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[VireX]

Thanks thats what was missing, I thought Q_OBJECT is only if i use SLOT/SIGNALs.

[jpn]

I thought Q_OBJECT is only if i use SLOT/SIGNALs.

Not only those, but also other meta-object system stuff (see Meta-Object System and QMetaObject).

The Q_OBJECT macro must appear in the private section of a class definition that declares its own signals and slots or that uses other services provided by Qt's meta-object system.

[wysota]

Not only those, but also other meta-object system stuff (see Meta-Object System and QMetaObject).

Or the other way round as signals and slots use the meta-object system and not vice versa. So Q_OBJECT enables creation of a meta-object for the class which implies an ability to declare signals and slots.