（3）创建一个查找对话框

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首先新建一个工程，Qt Gui Application，然后最后一步注意，Base Dialog选择QDialog，而不是默认的QMainWindow

头文件

#ifndef DIALOG_H#define DIALOG_H#include <QDialog>class QCheckBox;class QLabel;class QLineEdit;class QPushButton;class FindDialog : public QDialog{    Q_OBJECTpublic:    FindDialog(QWidget *parent = 0);    ~FindDialog();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 &text);private:    QLabel *label;    QLineEdit *lineEdit;    QCheckBox *caseCheckBox;    QCheckBox *backwardCheckBox;    QPushButton *findButton;    QPushButton *closeButton;};#endif // DIALOG_H

源文件：

#include "dialog.h"#include <QCheckBox>#include <QLabel>#include <QLineEdit>#include <QPushButton>#include <QHBoxLayout>FindDialog::FindDialog(QWidget *parent)    : QDialog(parent){    //&字母相当于定义个快捷键，当你按下Alt+F的时候，这个按钮就相当于被点击    label = new QLabel(tr("Find &what:"));    lineEdit = new QLineEdit;    //这个label使用了setBuddy函数，它的意思是，当label获得焦点时，    //比如按下Alt+W，它的焦点会自动传给它的buddy，也就是lineEdit    label->setBuddy(lineEdit);    caseCheckBox = new QCheckBox(tr("Match &case"));    backwardCheckBox = new QCheckBox(tr("Search &backford"));    findButton = new QPushButton(tr("&Find"));    findButton->setEnabled(false);//初始禁用    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()));    //左上布局    QHBoxLayout *topLeftLayout = new QHBoxLayout;    topLeftLayout->addWidget(label);    topLeftLayout->addWidget(lineEdit);    //左边布局    QVBoxLayout *leftLayout = new QVBoxLayout;    leftLayout->addLayout(topLeftLayout);    leftLayout->addWidget(caseCheckBox);    leftLayout->addWidget(backwardCheckBox);    //右侧布局    QVBoxLayout *rightLayout = new QVBoxLayout;    rightLayout->addWidget(findButton);    rightLayout->addWidget(closeButton);    //右侧整体置顶    rightLayout->addStretch();    //将左半部分和右半部分整体加入水平布局    QHBoxLayout *mainLayout = new QHBoxLayout;    mainLayout->addLayout(leftLayout);    mainLayout->addLayout(rightLayout);    setLayout(mainLayout);    //对话框的标题    setWindowTitle(tr("Find"));    setFixedHeight(sizeHint().height());}FindDialog::~FindDialog(){}void FindDialog::findClicked(){    //首先取出lineEdit的输入值    QString text = lineEdit->text();    //然后判断caseCheckBox是不是选中，如果选中就返回Qt::CaseInsensitive，否则返回Qt::CaseSensitive    Qt::CaseSensitivity cs = caseCheckBox->isChecked() ? Qt::CaseInsensitive : Qt::CaseSensitive;    //查找方向分支    if(backwardCheckBox->isChecked()) {        emit findPrevious(text, cs);    } else {        emit findNext(text, cs);    }}void FindDialog::enableFindButton(const QString &text){    //当文本不为空时启用Find按钮    findButton->setEnabled(!text.isEmpty());}

解释见注释。

下面是main函数，这部分工程自动生成：

#include "dialog.h"#include <QApplication>int main(int argc, char *argv[]){    QApplication a(argc, argv);    FindDialog w;    w.show();    return a.exec();}

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