第一个比较复杂的QT程序

linux下,使用qt creator,按照<<C++ GUI Progamming with Qt4>>上的例子进行开发.
注意,这个不是用表单设计器做的,是使用layout手动做的.

最终结果截图如下:


核心代码如下:
FindDialog.h

#ifndef FINDDIALOG_H
#define FINDDIALOG_H
#include <QDialog>
#include <QCheckBox>
#include <QLabel>
#include <QLineEdit>
#include <QPushButton>

class FindDialog : public QDialog{
        Q_OBJECT
public:
        FindDialog(QWidget *parent=0);
signals:
        void findNext(const QString &str, Qt::CaseSensitivity cs);
        void findPrevious(const QString &str, Qt::CaseSensitivity cs);
private slots:
        void findClicked();
        void enableFindButton(const QString &text);
private:
        QLabel *label;
        QLineEdit *lineEdit;
        QCheckBox *caseCheckBox;
        QCheckBox *backwardCheckBox;
        QPushButton *findButton;
        QPushButton *closeButton;
};
#endif // FINDDIALOG_H

FindDialog.cpp

#include <QtGui>
#include "FindDialog.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(QString)),
                        this, SLOT(enableFindButton(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());
}