学步园

注：全盘copy

来源C++ GUI Programming with Qt 4

头文件

#ifndef STUDY_2_H

***************************************************************

CPP

下面的程序中一大部分都是布局的，核心的地方还是信号槽的机制问题还有

尽管没有实现find的功能，不过findClock()函数值得借鉴。

#include <QtGui>

#include "study_2.h"

  finddialog::finddialog(QWidget *parent)

      : QDialog(parent)

  {

      label = new QLabel(tr("Find &what:"));

      lineEdit = new QLineEdit;

      label->setBuddy(lineEdit);

      caseCheckBox = new QCheckBox(tr("Match &case"));

     backwardCheckBox = new QCheckBox(tr("Search &backward"));

     findButton = new QPushButton(tr("&Find"));

     findButton->setDefault(true);

     findButton->setEnabled(false);

     closeButton = new QPushButton(tr("Close"));

     connect(lineEdit, SIGNAL(textChanged(const QString &)),

             this, SLOT(enableFindButton(const QString &)));

     connect(findButton, SIGNAL(clicked()),

             this, SLOT(findClicked()));

     connect(closeButton, SIGNAL(clicked()),

             this, SLOT(close()));

     QHBoxLayout *topLeftLayout = new QHBoxLayout;

     topLeftLayout->addWidget(label);

     topLeftLayout->addWidget(lineEdit);

     QVBoxLayout *leftLayout = new QVBoxLayout;

     leftLayout->addLayout(topLeftLayout);

     leftLayout->addWidget(caseCheckBox);

     leftLayout->addWidget(backwardCheckBox);

     QVBoxLayout *rightLayout = new QVBoxLayout;

     rightLayout->addWidget(findButton);

     rightLayout->addWidget(closeButton);

     rightLayout->addStretch();

     QHBoxLayout *mainLayout = new QHBoxLayout;

     mainLayout->addLayout(leftLayout);

     mainLayout->addLayout(rightLayout);

     setLayout(mainLayout);

     setWindowTitle(tr("Find"));

    setFixedHeight(sizeHint().height());

 }

 void finddialog::findClicked()

 {

     QString text = lineEdit->text();

     Qt::CaseSensitivity cs =

             caseCheckBox->isChecked() ? Qt::CaseSensitive

                                       : Qt::CaseInsensitive;

     if (backwardCheckBox->isChecked()) {

         emit findPrevious(text, cs);

     } else {

         emit findNext(text, cs);

     }

 }

 void finddialog::enableFindButton(const QString &text)

          {

     findButton->setEnabled(!text.isEmpty());

 }

##############################################

最后main.cpp

 
#include <QApplication>
 #include "study_2.h"
 int main(int argc, char *argv[])
 {
     QApplication app(argc, argv);
     finddialog *dialog = new finddialog;
     dialog->show();
     return app.exec();
 }
比较简略，先这样吧。
#define STUDY_2_H
#include<QDialog>
class QCheckBox;
class QLabel;
class QLineEdit;
class QPushButton;
class finddialog : public QDialog
{
    Q_OBJECT;
public:
    finddialog(QWidget *parent=0);//父类参数为0
signals:
    void findNext(const QString &str, Qt::CaseSensitivity cs) ;
    void findPrevious(const QString &str, Qt::CaseSensitivity cs);//后者是一个枚举类型{0,1}
private slots:
     void findClicked();
    void enableFindButton(const QString &text);
    private:
     QLabel *label;
    QLineEdit *lineEdit;
        QCheckBox *caseCheckBox;
      QCheckBox *backwardCheckBox;
        QPushButton *findButton;
         QPushButton *closeButton;
};
#endif // STUDY_2_H