Switching between one QToolButton to another in QT - c++

Question

I want to switch from one QToolButton to another in QToolBar. I have used QStackedWidget, their it is too simple to move from one widget to other but here I am not able to get how to move via using keyReleaseEvent.
mywindow::mywindow() : QMainWindow()
{
widget = new QWidget();
setCentralWidget(widget);
tool = new QToolBar();
vertical = new QVBoxLayout();
button1 = new QToolButton();
connect( button1, SIGNAL(clicked()), this, SLOT(fileNew()) );
button2 = new QToolButton();
button3 = new QToolButton();
button1->setIcon(QIcon("download.jpg"));
button1->setGeometry(0,0,100,200);
button2->setIcon(QIcon("images.jpg"));
button3->setIcon(QIcon("settings-icon.jpg"));
//stack1->addWidget(button1);
//stack1->addWidget(button2);
//stack1->addWidget(button3);
tool->addWidget(button1);
tool->addWidget(button2);
tool->addWidget(button3);
//tool->addWidget(stack1);
vertical->addWidget(tool);
widget->setLayout(vertical);
}
void mywindow::keyReleaseEvent(KeyEvent *event)
{
switch(event->key())
{
case:Qt::Key_Left:
}
}

Answer 1

You need to check against the focus, and shift that as appropriate. I would write something like this:
void mywindow::keyReleaseEvent(KeyEvent *event)
{
switch(event->key())
{
case:Qt::Key_Left:
if (button3->hasFocus())
button2->setFocus();
else if (button2->hasFocus())
button1->setFocus();
break;
case:Qt::Key_Right:
if (button1->hasFocus())
button2->setFocus();
else if (button2->hasFocus())
button3->setFocus();
break;
}
}
Note that this code can go tedious easily if you keep adding further buttons. I would place them into a container. Then, I would iterate through that container forward and reverse order depending on the focus switching logic.
See the documentation for further details:
focus : const bool
This property holds whether this widget (or its focus proxy) has the keyboard input focus.
By default, this property is false.
Note: Obtaining the value of this property for a widget is effectively equivalent to checking whether QApplication::focusWidget() refers to the widget.
Access functions:
bool hasFocus() const