问题
I have a table and move around inside with left, right, up, down buttons. Now I need to create a SIGNAL when I stay in a certain cell and press SPACE button. This SIGNAL should bring also the coordinate of that cell. I tried with standard signals of QTableWidget but it does not work. How can I solve this?
回答1:
Create a separate header file i.e. "customtable.h" and then in the Designer you can Promote the existing QTableWidget to this class.
class customTable:public QTableWidget
{
Q_OBJECT
public:
customTable(QWidget* parent=0):QTableWidget(parent){}
protected:
void keyPressEvent(QKeyEvent *e)
{
if(e->key()==Qt::Key_Space)
{
emit spacePressed(this->currentRow(),this->currentColumn());
}
else { QTableWidget::keyPressEvent(e); }
}
signals:
spacePressed(int r, int c);
};
回答2:
You can use an event filter to do this:
class TableSpaceWatcher : public QObject {
Q_OBJECT
bool eventFilter(QObject * receiver, QEvent * event) override {
auto table = qobject_cast<QTableWidget*>(receiver);
if (table && event->type() == QEvent::KeyPress) {
auto keyEvent = static_cast<QKeyEvent*>(event);
if (keyEvent->key() == Qt::Key_Space)
emit spacePressed(table->currentRow(), table->currentColumn());
}
return false;
}
public:
using QObject::QObject;
Q_SIGNAL void spacePressed(int row, int column);
void installOn(QTableWidget * widget) {
widget->installEventFilter(this);
}
};
QTableWidget table;
TableSpaceWatcher watcher;
watcher.installOn(&table);
来源:https://stackoverflow.com/questions/44284252/how-to-create-a-signal-for-qtablewidget-from-keyboard