QT之键盘事件

Widget.h:

#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
#include<QKeyEvent>
#include "mypushbutton.h"
class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = 0);
    ~Widget();
    void keyPressEvent(QKeyEvent* e);
    void keyReleaseEvent(QKeyEvent* e);
private:
    MyPushButton *p1;
    MyPushButton *p2;
};

#endif // WIDGET_H

mypushbutton.h:

#ifndef MYPUSHBUTTON_H
#define MYPUSHBUTTON_H

#include <QPushButton>
class MyPushButton : public QPushButton
{
    Q_OBJECT
public:
    explicit MyPushButton(const QString& text,QWidget *parent = nullptr);
    void keyPressEvent(QKeyEvent* e);
    void keyReleaseEvent(QKeyEvent* e);
signals:

public slots:
};

#endif // MYPUSHBUTTON_H

mypushbutton.cpp:

#include "mypushbutton.h"
#include<QKeyEvent>
#include<QDebug>
MyPushButton::MyPushButton(const QString& text,QWidget *parent)
:QPushButton(text,parent){}
void MyPushButton::keyPressEvent(QKeyEvent* e)
{
    //e->modifiers()   修饰键
  if(e->modifiers()&Qt::ControlModifier)
  {
      qDebug()<<"子类的Ctrl被按下了"<<endl;
  }
  if(e->modifiers()&Qt::AltModifier)
  {
      qDebug()<<"子类的Alt被按下了"<<endl;
  }
      switch(e->key())
      {
      case Qt::Key_A:
          qDebug()<<__FUNCTION__<<e->text()<<endl;
          break;
      case Qt::Key_D:
          qDebug()<<__FUNCTION__<<e->text()<<endl;
          break;
      }
}
void MyPushButton::keyReleaseEvent(QKeyEvent* e)
{

}

widget.cpp:

#include "widget.h"
#include<QDebug>
#include "mypushbutton.h"
#include<QVBoxLayout>
Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    p1=new  MyPushButton("按钮1",this);
    p2=new  MyPushButton("按钮2",this);
    QVBoxLayout *s=new QVBoxLayout(this);
    s->addWidget(p1);
    s->addWidget(p2);
    //this->setFocus(); //本来是子窗口接受键盘事件,现在设置焦点窗口为父窗口
this->setFocus(Qt::OtherFocusReason); //按tab键可以实现在两个按钮之间来回切换
}

void Widget::keyPressEvent(QKeyEvent* e)
{

  //e->modifiers()   修饰键
if(e->modifiers()&Qt::ControlModifier)
{
    qDebug()<<"Ctrl被按下了"<<endl;
}
if(e->modifiers()&Qt::AltModifier)
{
    qDebug()<<"Alt被按下了"<<endl;
}
    switch(e->key())
    {
    case Qt::Key_A:
        qDebug()<<e->text()<<endl;
        break;
    case Qt::Key_D:
        qDebug()<<e->text()<<endl;
        break;

    }
}
void Widget::keyReleaseEvent(QKeyEvent* e)
{

}


Widget::~Widget()
{

}

main.cpp：

#include "widget.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();

    return a.exec();
}

效果: