我有一张桌子,用左,右,上,下按钮在里面移动。现在我需要在我停留在某个单元格时按下SPACE按钮创建一个SIGNAL。此SIGNAL还应该带来该单元格的坐标。我尝试使用QTableWidget的标准信号,但它不起作用。我该如何解决这个问题?
答案 0 :(得分:4)
创建一个单独的头文件,即“customtable.h”,然后在Designer中,您可以将现有的QTableWidget推广到此类。
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);
};
答案 1 :(得分:4)
您可以使用事件过滤器执行此操作:
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);