QT开发 查找窗口创建

刚开始学习QT开发，第一个查找窗口，按照书上写的，加上自己的一些理解注释

所包含文件有如下三个：

finddialog.cpp     finddialog.h     和      main.cpp

mian.cpp为程序入口，finddialog.cpp为窗口的创建以及按钮的各种功能实现头文件为一些定义

头文件finddialog.h内容：

#ifndef FINDDIALOG_H
#define FINDDIALOG_H

#include <QDialog>

class QCheckBox;
class QLabel;
class QLineEdit;
class QPushButton;

/*
namespace Ui {
class Dialog;
}*/

class FindDialog : public QDialog
{
Q_OBJECT

public:
/*explicit Dialog(QWidget *parent = 0);
~Dialog();*/
FindDialog(QWidget *parent = 0);
signals:          //这个类所拥有的信号
void findNext(const QString &str, Qt::CaseSensitivity cs);
void findPrevious(const QString &str, Qt::CaseSensitivity cs);

private slots:   //这个类所拥有的槽
void findClicked();
void enableFindButton(const QString &text);

private:
/*Ui::Dialog *ui;*/
QLabel *label;
QLineEdit *lineEdit;
QCheckBox *caseCheckBox;
QCheckBox *backwardCheckBox;
QPushButton *findButton;
QPushButton *closeButton;
};

#endif // FINDDIALOG_H

finddialog.cpp内容：

#include <QtGui>
#include "finddialog.h"
#include "ui_dialog.h"

FindDialog::FindDialog(QWidget *parent) :
QDialog(parent)
//ui(new Ui::Dialog)
{
label = new QLabel(tr("Find &what:"));//新建一个label主窗口
lineEdit = new QLineEdit;//新建一个可编辑窗口lineEdit
label->setBuddy(lineEdit);//把lineEdit窗口放在label窗口下

caseCheckBox = new QCheckBox(tr("Match &case"));
backwardCheckBox = new QCheckBox(tr("Search *backward"));

findButton = new QPushButton(tr("&Find"));
findButton->setDefault(true);//让find按钮成为对话框的默认按钮
findButton->setEnabled(false);//让find按钮变成灰色，使其禁用

closeButton = new QPushButton(tr("Close"));//创建一个close按钮

//以下三个connect均用信号与槽对各按钮的功能链接
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());
/*ui->setupUi(this);*/
}

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());
}

/*
Dialog::~Dialog()
{
delete ui;
}
*/

主函数main：

//#include <QtGui/QApplication>
#include <QApplication>
#include "finddialog.h"

int main(int argc, char *argv[])
{
QApplication app(argc, argv);
FindDialog *dialog = new FindDialog;   //创建一个窗口
dialog->show();                        //显示这个窗口
//Dialog w;
//w.show();

return app.exec();
}