Hover event on QPushButton

[Shodan]

I tried but I did not really understant everything.

In the .h file I declared a function called filterBtn1();

#ifndef TEST_H
#define TEST_H

#include <QApplication>
#include <QWidget>
#include <QPixmap>
#include <QPushButton>
#include <QObject>
#include <QHoverEvent>

class myMainWindow : public QWidget
{
    public:
    myMainWindow();

    public slots:
    void filterBtn1();

    private:
    QPushButton *btn1;
};

The main.cpp

#include "Test.h"

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    myMainWindow mainWindow;
    mainWindow.setFixedSize(1024, 768);
    mainWindow.show();

    return app.exec();
}

Then I added an event filter: "btn1->installEventFilter(filterBtn1);"
And I understood that I have to create a class in the .cpp file and set boolean conditions:
From this point, the example of the Qt documentation is a bit to complicate for me.

#include "Test.h"

myMainWindow::myMainWindow() : QWidget()
{
    btn1 = new QPushButton("", this);
    btn1->setGeometry(0, 150, 104, 103);
    btn1->setIcon(QIcon("btnLogs/1.jpg"));
    btn1->setIconSize(QSize(104, 103));
    btn1->installEventFilter(filterBtn1);
}

class filterBtn1 : public QObject
{
    Q_OBJECT
protected:
    bool eventFilter(QObject ???*, QEvent *???);
};

bool filterBtn1::eventFilter(QObject *???, QEvent *???)
{
    if (event->type() == QEvent::HoverEnter) {
btn1->setIcon(QIcon("btnLogs/1_hover.jpg"));
    } else {
???
    }
}

[Shodan]

If someone could help me with that it would be great.

[c64zottel]

@Shodan said in Hover event on QPushButton:

QPushButton

As far as I see it, its quite similar as in Qml. You can use:
void QWidget::enterEvent(QEvent *event)
void QWidget::leaveEvent(QEvent *event)
from here:
http://doc.qt.io/qt-5/qpushbutton-members.html
An event is sent to the widget when the mouse cursor enters the widget.
A leave event is sent to the widget when the mouse cursor leaves the widget.

[Shodan]

@c64zottel

I tried with those members like this:
.h file

#ifndef TEST2_H
#define TEST2_H

#include <QApplication>
#include <QWidget>
#include <QPushButton>


class myMainWindow : public QWidget
{
    Q_OBJECT

    public:
    myMainWindow();
    QPushButton *btn1;

    public slots:
    void enterEvent(QPushButton *btn1);
    void leaveEvent(QPushButton *btn1);

    private:
};

#endif // TEST2_H

.cpp file

#include "test2.h"

myMainWindow::myMainWindow() : QWidget()
{
    btn1 = new QPushButton("", this);
    btn1->setGeometry(0, 150, 104, 103);
    btn1->setIcon(QIcon("btnLogs/1.jpg"));
    btn1->setIconSize(QSize(104, 103));
}

void myMainWindow::enterEvent(QPushButton *btn1)
{
    btn1->setIcon(QIcon("btnLogs/1_hover.jpg"));
}

void myMainWindow::leaveEvent(QPushButton *btn1)
{
    btn1->setIcon(QIcon("btnLogs/1.jpg"));
}

No errors come up when I run the programm. Nothing happens when mouse goes over the button.
I belive there is a connection to do with the button but I can't figure out how.
At least I hope this is the right way to use void QWidget::enterEvent(QEvent *event).

Thanks for your answers

[SGaist]

With all due respect, it seems you have a lack of C++ knowledge regarding virtual method re-implementation.

The methods you re-implement must have matching signatures.

Did you read the documentation chapter about handling events I linked to ?

[Shodan]

Yes I know.
I began with Qt only a few days ago :-)

Of course I read id and tried to follow the examples.
Since I am not english, many things are hard to understand.

[SGaist]

Well, in this case, it has nothing to do with Qt but basic C++. See polymorphism.

[c64zottel]

Ok, to test myself I did this in about 10 min. Since I can't upload a tar file, here is a link:
[https://www.file-upload.net/download-12680886/TestEnterLeaveEvent.tar.gz.html](link url)

For the sake of discussion and future references, here is the main code:

class CustomButton : public QPushButton
{
    // QWidget interface
protected:
    virtual void enterEvent(QEvent *) {
        qDebug() << "entering";
        QPalette pal = palette();
        pal.setColor(QPalette::Button, QColor(Qt::blue));
        setAutoFillBackground(true);
        setPalette(pal);
        update();
    }

    virtual void leaveEvent(QEvent *) {
        qDebug() << "leaving";
        QPalette pal = palette();
        pal.setColor(QPalette::Button, QColor(Qt::red));
        setAutoFillBackground(true);
        setPalette(pal);
        update();
    }
};

The MainWindow has a pointer to a CustomButton, which is initialized in the ctor:

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    cb = new CustomButton;

    cb->setText( "My funny button");
    this->setCentralWidget( cb );
}

[SGaist]

@c64zottel There's no need to call setAutoFileBackground in every function. That's typically something you do once in the constructor.

[J.Hilk]

@c64zottel If it's just the background color you want to change, I would recomment the use of a StyleSheet:

QPushButton *btn = new QPushButton();
btn->setObjectName("btnName_1");
btn->show();
btn->setSteyleSheet(
"   QPushButton#btnName_1 {"
"     background-color: yellow;"
" }"
" QPushButton#btnName_1:pressed {"
"     background-color: rgb(224, 0, 0);     "
" }"
" QPushButton#btnName_1:hover {"
"     background-color: rgb(224, 255, 0);"
" }"

"QPushButton#btnName_1:hover:pressed"
"{"
"    background-color:red;"
"}"
);

[Shodan]

I tried to change the button icon with a styleSheet like this:

#include "test2.h"

myMainWindow::myMainWindow() : QWidget()
{
    btn1 = new QPushButton("", this);
    btn1->setGeometry(0, 150, 104, 103);
    btn1->setObjectName("btn1_Name");
    btn1->show();
    btn1->setStyleSheet(
    "   QPushButton#btn1_Name {"
    "     background-image: url('btnLogs/1.jpg');"
    " }"
    " QPushButton#btn1_Name:pressed {"
    "     background-image: url('btnLogs/1_pressed.jpg');"
    " }"
    " QPushButton#btn1_Name:hover {"
    "     background-image: url('btnLogs/1_hover.jpg');"
    " }"
    "QPushButton#btn1_Name:hover:pressed"
    "{"
    "     background-image: url('btnLogs/1_pressed.jpg');"
    "}"
    );
}

It seems to work, even better than expected since there are the "pressed" status within.
For what I want to do it's just great!

I'll try to do this using a event filter in my next programm, with a bit more experience in Qt.

Thanks all the people for your help with this.

Best regards :-}