KeyBoard Event in QListWidget
-
I want to use keyboard up down left right buttons .
So i have re-implemented the QListWidget class
@class qListWidget :
public QListWidget
{
public:
qListWidget(void)
{
}~qListWidget(void)
{
}
void keyPressEvent(QKeyEvent* event)
{
QListWidget::keyPressEvent(event);
emit itemSelectionChanged();}
}@
Now What signal should i Emit
I initially thought of emitting itemSelectionChanged()
and but what slot should i connect it to
Suppose i connect to a self defined function MyFunc()@ connect(listwidget,SIGNAL(itemSelectionChanged(),this,SLOT(MyFuc())) @
what code should i put in MyFunc function to get current select item
@
QlistWidget* MyFuc()
{
??
}
@ -
First of all, you have to get the ID of the pressed key:
@
class my_list : public QListWidget
{
Q_OBJECT
private:
int key_pressed = 0;public:
my_list(QWidget* parent = 0);void keyPressEvent(QKeyEvent* event)
{
QListWidget::keyPressEvent(event);
key_pressed = event->key(); // store Qt::Key value in variable key_pressed
emit itemSelectionChanged();
}public slots:
void MyFunc();
}
@
In function MyFunc(), you'll then have to check which key was pressed and react on that, if necessary:
@my_list *list = new my_list();
connect(list,SIGNAL(itemSelectionChanged(), list,SLOT(MyFuc()));void my_list::MyFunc()
{
int row = this->indexFromItem(this->currentItem())->row();
int column = this->indexFromItem(this->currentItem())->column();if(key_pressed == Qt::Key_Left)
column--;
else if(key_pressed == Qt::Key_Right)
column++;
else if(key_pressed == Qt::Key_Down)
row--;
else if(key_pressed == Qt::Key_Up)
row++;if(key_pressed != 0)
this->setCurrentItem(itemAt(row, column));
key_pressed = 0;
}@
I did not check this code, but maybe that gives you an idea how to handle that... -
Hi,
Why do you need to reimplement keyPressEvent ? Keyboard navigation is already active on QListWidget ?
currentItem looks like the function you need
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Connect a slot to the itemSelectionChanged signal, or depending on your needs currentItemChanged. There's no need to reimplement anything keyboard wise, it's already working.
