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QLabel单击事件

2011-10-05 22:46

//  .h file
#ifndef WIDGET_H
#define WIDGET_H

#include <QtGui/QWidget>
#include <QLabel>
#include <QKeyEvent>
#include <QMessageBox>
#include <QVBoxLayout>

class Widget : public QWidget
{
       Q_OBJECT
public:
      Widget(QWidget *parent = 0);
     ~Widget();
private:
     QLabel *Label;
protected:
     bool eventFilter(QObject *obj, QEvent *event);
};
#endif // WIDGET_H

//  .cpp file
#include "widget.h"

Widget::Widget(QWidget *parent): QWidget(parent)
{
    Label = new QLabel(this);
    Label->setText("Hello, Clicked  Me,Please!");
    Label->setFont(QFont("Times New Roman",16));

    QVBoxLayout *hLayout = new QVBoxLayout(this);
    hLayout->addWidget(Label);
    this->setLayout(hLayout);
    this->resize(320,240);

    Label->installEventFilter(this);    //  installEventFilter is important for this sample
}

Widget::~Widget()
{
}

bool Widget::eventFilter(QObject *obj, QEvent *event)
{
           if (obj == Label)
           {
                   if (event->type() == QEvent::MouseButtonPress) {
                                QMessageBox::warning(this,tr("Label Clicked Event"),tr("Ouch,Label was clicked !!"),
                                QMessageBox::Yes);
                                return true;
                  }
                  else
                        return false;
           }
       else
               return QWidget::eventFilter(obj, event);
}

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QLabel单击事件