How come a Qt mouseReleaseEvent won't fire?

Question

So, I have a custom QLabel class that I'm using as a button. When the label is clicked, the background color changes from red to green. On the mouse release event, the background goes back to red. However, if I add a slot to the widget's "clicked" signal, the mouse release event appears to never be fired. The label stays green. At the moment, I have it so when the label is clicked, a QMessageBox is displayed. Yet, even after the messagebox is closed, the label stays green. I tried connecting it's focusOutEvent to the same slot that turned the background red, yet it's still not working. How can I get the button to revert to a red background immediately after the mouse is released? I hope this makes sense. Any ideas?

#include "ubtn.h"
QString sty  =  "ubtn{background:red;}";
QString styd =  "ubtn{background:green;}";

QWidget *obj;
ubtn::ubtn(QWidget *parent) :
    QLabel(parent)
{
    this->setStyleSheet(sty);
    connect(this, SIGNAL(onBlur(bool)), SLOT(defaultBtn()));
}

void ubtn::defaultBtn()
{
    this->setStyleSheet(sty);
    this->repaint();
}

void ubtn::downBtn()
{
    this->setStyleSheet(styd);
    this->repaint();
}

void ubtn::mousePressEvent(QMouseEvent *ev)
{
    downBtn();
    emit clicked();
}

void ubtn::mouseReleaseEvent(QMouseEvent *ev)
 {
    defaultBtn();
 }

void ubtn::focusOutEvent(QFocusEvent *e)
 {
    QLabel::focusOutEvent(e);
    emit(onBlur(true));
 }

Sylvain V Sylvain V · Accepted Answer · 2013-08-09T05:44:28

Try this in the defaultBtn function:

setStyleSheet(sty);
style()->unpolish(this);
style()->polish(this);

How come a Qt mouseReleaseEvent won't fire?

2 Answers