怎样全局监听qlineedit的输入事件,直接给出c++代码
时间: 2023-02-11 21:25:32 浏览: 291
在Qt中,可以使用QApplication的installEventFilter()函数来全局监听QLineEdit的输入事件。代码示例如下:
```c++
#include <QApplication>
#include <QLineEdit>
class MyLineEdit : public QLineEdit
{
Q_OBJECT
public:
MyLineEdit(QWidget *parent = 0) : QLineEdit(parent) {}
protected:
bool eventFilter(QObject *watched, QEvent *event)
{
if (watched == this && event->type() == QEvent::KeyPress) {
QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event);
// 处理键盘输入事件
}
return QLineEdit::eventFilter(watched, event);
}
};
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MyLineEdit *lineEdit = new MyLineEdit;
a.installEventFilter(lineEdit);
lineEdit->show();
return a.exec();
}
```
在上面的代码中,MyLineEdit是从QLineEdit派生而来的,重载了eventFilter()函数,并在其中处理键盘输入事件。在main函数中,我们使用QApplication的installEventFilter()函数将MyLineEdit安装为全局事件过滤器,从而实现对QLineEdit的全局监听。
阅读全文
相关推荐













