QT练习4:编写一个查找对话框

最新推荐文章于 2024-08-30 17:23:15 发布

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最新推荐文章于 2024-08-30 17:23:15 发布

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本文详细介绍了一个基于Qt的FindDialog对话框的设计与实现过程，包括对话框的布局、信号与槽的连接以及如何响应用户的查找请求。通过自定义类FindDialog继承自QDialog，实现了文本查找功能，支持区分大小写及向前向后搜索。

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分为3个文件:

finddialog.h:

#ifndef FINDDIALOG_H
#define FINDDIALOG_H

#include <QDialog>

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

//自定义类,继承于QDialog
class FindDialog:public QDialog
{
Q_OBJECT
public:
FindDialog(QWidget *parent=0);//构造函数

signals:
void findNext(const QString &str,bool caseSensitive);
void findPrev(const QString &str,bool caseSensitive);
private slots://私有槽
void findClicked();
void enableFindButton(const QString &text);

private:
//声明窗口要使用到的部件
QLabel *label;
QLineEdit *lineEdit;
QCheckBox *caseCheckBox;
QCheckBox *backwardCheckBox;
QPushButton *findButton;
QPushButton *closeButton;

};

#endif // FINDDIALOG_H

finddialog.cpp

#include <QCheckBox>
#include <QLabel>
#include <QLayout>
#include <QLineEdit>
#include <QPushButton>

#include "finddialog.h"

FindDialog::FindDialog(QWidget *parent)
:QDialog(parent)//对父类进行构造
{
label = new QLabel(tr("Find &what:"),this);
lineEdit = new QLineEdit("wenhao",this);
label->setBuddy(lineEdit);//label,lineEdit是伙伴关系.按label的快捷键进入lineEdit中

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

findButton = new QPushButton(tr("&Find"),this);
findButton->setDefault(true);//接回车键相当于按下findButton键
findButton->setEnabled(false);//这个设置让其默认是不可以点击的.

closeButton = new QPushButton(tr("Close"),this);
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(1);//

QHBoxLayout *mainLayout = new QHBoxLayout(this);
mainLayout->setMargin(11);
mainLayout->setSpacing(4);
mainLayout->addLayout(leftLayout);
mainLayout->addLayout(rightLayout);
setLayout(mainLayout);

setWindowTitle(tr("Find..."));
}

void FindDialog::findClicked()
{
QString text = lineEdit->text();
bool caseSensitive = caseCheckBox->isChecked();

if(backwardCheckBox->isChecked())
emit findPrev(text,caseSensitive);
else
emit findNext(text,caseSensitive);
}

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

main.cpp

#include <QApplication>
#include <QPushButton>
#include <QHBoxLayout>
#include <QWidget>
#include "finddialog.h"
int main(int argc, char *argv[])
{
QApplication app(argc,argv);
FindDialog *dialog = new FindDialog;
dialog->show();
return app.exec();
}

效果图: