C++ Exercises（三）-优快云博客

本文介绍了一个简单的FindDialog对话框实现方法，该对话框用于在应用程序中进行文本查找操作。通过几个基本控件如QLabel、QLineEdit、QCheckBox及QPushButton的组合使用，并结合信号与槽机制，实现了匹配大小写及向前向后的查找功能。

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// finddialog.h

#ifndef FINDDIALOG_H

#define FINDDIALOG_H

#include <QDialog>

class QCheckBox;

class QLabel;

class QLineEdit;

class QPushButton;

class FindDialog : public QDialog

{

Q_OBJECT

public:

FindDialog(QWidget *parent = 0);

signals://声明信号

void findNext(const QString &str,Qt::CaseSensitivity cs);

void findPrev(const QString &str,Qt::CaseSensitivity cs);

private slots://声明槽

void findClicked();

void enableFindButton(const QString &str);

private:

QLabel *lable;

QLineEdit *lineEdit;

QCheckBox *caseCheckBox;

QCheckBox *backwardCheckBox;

QPushButton *findBtn;

QPushButton *closeBtn;

};

#endif

// finddialog.cpp

#include <QtGui>

#include "finddialog.h"

FindDialog::FindDialog(QWidget *parent) : QDialog(parent)

{

this->lable = new QLabel(tr("Find &what:"),this);

this->lineEdit = new QLineEdit(this);

lable->setBuddy(lineEdit);

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

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

findBtn = new QPushButton(tr("&Find"),this);

findBtn->setDefault(true);

findBtn->setEnabled(false);

closeBtn = new QPushButton(tr("Close"),this);

QObject::connect(lineEdit,SIGNAL(textChanged(const QString &)),this,SLOT(enableFindButton(const QString &)));

QObject::connect(findBtn,SIGNAL(clicked()),this,SLOT(findClicked()));

QObject::connect(closeBtn,SIGNAL(clicked()),this,SLOT(close()));

QHBoxLayout *topLeftLayout = new QHBoxLayout;

topLeftLayout->addWidget(lable);

topLeftLayout->addWidget(lineEdit);

QVBoxLayout *leftLayout = new QVBoxLayout;

leftLayout->addLayout(topLeftLayout);

leftLayout->addWidget(caseCheckBox);

leftLayout->addWidget(backwardCheckBox);

QVBoxLayout *rightLayout = new QVBoxLayout;

rightLayout->addWidget(findBtn);

rightLayout->addWidget(closeBtn);

rightLayout->addStretch(1);

QHBoxLayout *mainLayout = new QHBoxLayout(this);

mainLayout->setMargin(11);

mainLayout->setSpacing(5);

mainLayout->addLayout(leftLayout);

mainLayout->addLayout(rightLayout);

this->setWindowTitle(tr("Find"));

this->setFixedHeight(sizeHint().height());

}

void FindDialog::findClicked()

{

QString text = lineEdit->text();

Qt::CaseSensitivity cs = caseCheckBox->isChecked() ? Qt::CaseSensitive : Qt::CaseInsensitive;

if(backwardCheckBox->isChecked())

emit findPrev(text,cs);//发射"向前搜索信号"

else

emit findNext(text,cs);//发射"向后搜索信号"

}

void FindDialog::enableFindButton(const QString &str)

{

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

}

//main.cpp

#include <QApplication>

#include "finddialog.h"

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

{

QApplication app(argc,argv);

FindDialog *dialog = new FindDialog;

dialog->show();

return app.exec();

}

本文转自Phinecos(洞庭散人)博客园博客，原文链接：http://www.cnblogs.com/phinecos/archive/2007/05/03/735019.html，如需转载请自行联系原作者