QT的FindDialog

#ifndef FINDDIALOG_H

#define FINDDIALOG_H

#include<QDialog>

class QCheckBox;

class QLabel;

class QLineEdit;

class QPushButton;

class FindDialog:public QDialog

{

Q_OBJECT

//使用信号和槽时声明

public:

FindDialog(QWidget* pParents = 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& str);

private:

QLabel* label;

QLineEdit* lineEdit;

QCheckBox* caseCheckBox;

QCheckBox* backwardCheckBox;

QPushButton* findButton;

QPushButton* closeButton;

};

#endif // FINDDIALOG_H

#include<QtGui>

#include"FindDialog.h"

FindDialog::FindDialog(QWidget* pParent)

{

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

lineEdit = new QLineEdit;

label->setBuddy(lineEdit);

caseCheckBox = new QCheckBox(tr("Math &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 &str)

{

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

}

#include<QtGui>

#include<QApplication>

#include<QHBoxLayout>

#include<QSlider>

#include<QSpinBox>

#include"FindDialog.h"

int main(int argc, char* argv[])

{

QApplication app(argc, argv);

FindDialog* pFind = new FindDialog;

pFind->show();

return app.exec();

}