查找对话框实现

finddialog.h

 

/****************************************************************************
**
** File : finddialog.h
**
****************************************************************************/

#ifndef _FINDDIALOG_H_
#define _FINDDIALOG_H_

#include <QDialog>

//类前向声明
class QLabel;
class QLineEdit;
class QCheckBox;
class 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();//处理查找按钮单击事件
  void enableFindButton(const QString &text);//开启查找按钮
private:
  QLabel *label;
  QLineEdit *lineEdit;
  QCheckBox *caseCheckBox;
  QCheckBox *backwardCheckBox;
  QPushButton *findButton;
  QPushButton *closeButton;
};
#endif // !_FINDDIALOG_H_

 

finddialog.cpp:

 

/****************************************************************************
**
** File : 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(const QString&)),
    this,SLOT(enableFindButton(const QString&)));
  connect(closeButton,SIGNAL(clicked()),this,SLOT(close()));
  connect(findButton,SIGNAL(clicked()),this,SLOT(findClicked()));
    
  QHBoxLayout *leftTopLayout=new QHBoxLayout;
  leftTopLayout->addWidget(label);
  leftTopLayout->addWidget(lineEdit);
    
  QVBoxLayout *leftLayout=new QVBoxLayout;
  leftLayout->addLayout(leftTopLayout);
  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 Dialog"));
  setFixedHeight(sizeHint().height());
}

void FindDialog::enableFindButton(const QString &text)
{
  findButton->setEnabled(!text.isEmpty());
}

void FindDialog::findClicked()
{
  QString text=lineEdit->text();
    
  Qt::CaseSensitivity cs=caseCheckBox->isChecked()?Qt::CaseSensitive:Qt::CaseInsensitive;
    
  if(backwardCheckBox->isChecked())
  {
    emit findPrevious(text,cs);//emit 发射信号
  }else{
    emit findNext(text,cs);
  }
}

 

 

主文件测试findmain.cpp

 

#include <QApplication>

#include "finddialog.h"

int main(int argc,char* argv[])
{
  QApplication app(argc,argv);
  FindDialog *findDlg=new FindDialog;
  findDlg->show();
  return app.exec();
}

 

 

截图: