qfedu-qt-level/qtdemo03/form8.cpp

#include "form8.h"
#include "ui_form8.h"

Form8::Form8(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Form8)
{
    ui->setupUi(this);

    ui->Form8label->setWordWrap(true);
//    ui->Form8label->setMinimumWidth(400);
//    ui->Form8label->setMaximumWidth(400);
}

Form8::~Form8()
{
    delete ui;
}

bool Form8::event(QEvent *evt)
{
    qDebug()<<"事件分发"<<evt->type();
    if(evt->type() == QEvent::KeyRelease){
        QKeyEvent *keyEvent = static_cast<QKeyEvent*>(evt);
        if(keyEvent->key() == Qt::Key_Tab||keyEvent->key() == Qt::Key_O){
//            ui->Form8label->setText(tr("按下 %1 键").arg(keyEvent->text()));
            qDebug()<<tr("按下 %1 键").arg(keyEvent->text());
            return true;
        }
//        return false; // 不分发此事件
    }
//    return QWidget::event(evt);
    return false;
}

void Form8::keyPressEvent(QKeyEvent *event)
{
    QString s = ui->Form8label->text();
    // 如果按下的是换行
    if(event->key() == Qt::Key_Enter){
        s+="\r\n";
    }else if(event->key() == Qt::Key_Space){
        s.clear();
    }else if(event->key() == Qt::Key_Backspace){
        //        s.remove(s.size()-1,1);
        s.chop(1);

    }
    else{
        s += event->text();
    }

    ui->Form8label->setText(s);
}